JP4187251B2

JP4187251B2 - Brake hydraulic pressure control device for vehicle and normally closed solenoid valve

Info

Publication number: JP4187251B2
Application number: JP2004098725A
Authority: JP
Inventors: 明秀高柳; 達哉篠原; 愛司中田
Original assignee: Nissin Kogyo Co Ltd
Current assignee: Hitachi Astemo Ltd
Priority date: 2004-03-30
Filing date: 2004-03-30
Publication date: 2008-11-26
Anticipated expiration: 2024-03-30
Also published as: JP2005280536A

Description

本発明は、作動液の流路を開閉する電磁弁を有する車両用ブレーキ液圧制御装置及び作動液制御用の常閉型の電磁弁に関するものである。 The present invention relates to a vehicular brake hydraulic pressure control device having an electromagnetic valve for opening and closing a flow path of hydraulic fluid, and a normally closed electromagnetic valve for controlling hydraulic fluid.

従来、例えば車両用ブレーキ液圧制御装置は、作動液の流路を開閉する電磁弁（ソレノイド・バルブ）や、作動液の液圧を検出する手段としての圧力センサなどが組み込まれている（例えば、特許文献１参照）。 Conventionally, for example, a brake fluid pressure control device for a vehicle incorporates an electromagnetic valve (solenoid valve) for opening and closing a flow path of hydraulic fluid, a pressure sensor as a means for detecting hydraulic pressure of hydraulic fluid, and the like (for example, , See Patent Document 1).

このような圧力センサとしては、歪ゲージが一般に用いられており、車両用ブレーキ液圧制御装置における電子制御部と電気的に接続された精密電気部品である。 As such a pressure sensor, a strain gauge is generally used, which is a precision electrical component electrically connected to an electronic control unit in a vehicle brake hydraulic pressure control device.

しかしながら、このような圧力センサは、車両用ブレーキ液圧制御装置に用いる場合、流路上に圧力センサを配置せざるを得ない点と、液密性を考慮することによる組付性の低下や、電子制御部との接続を考慮することによるレイアウトの自由度が低かった。
特開２００３−３４１４９９号公報 However, when such a pressure sensor is used in a vehicle brake fluid pressure control device, the pressure sensor must be disposed on the flow path, and the assembly performance is reduced due to liquid tightness considerations, The degree of freedom in layout by considering the connection with the electronic control unit was low.
JP 2003-341499 A

本発明は、液圧検出手段の組み付け性及びレイアウト性を向上させた車両用ブレーキ液圧制御装置を提供することを目的とする。また、本発明は、作動液の流路における液圧を効率よく検出できる機能を備える常閉型の電磁弁を提供することを目的とする。 SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicle brake hydraulic pressure control device that improves the assembly and layout of a hydraulic pressure detecting means. It is another object of the present invention to provide a normally closed electromagnetic valve having a function capable of efficiently detecting the hydraulic pressure in the flow path of hydraulic fluid.

（１）上記課題を解決するため、本発明は、
流路におけるブレーキ用の作動液の液圧を検出する液圧検出手段と、検出された液圧に基づいて流路に設けられた電磁弁を制御する電子制御部と、を有する車両用ブレーキ液圧制御装置において、
前記電磁弁は、常閉型の電磁弁を含み、
前記常閉型の電磁弁は、固定コアと、可動コアと、可動コア駆動用のコイルと、を有し、
前記液圧検出手段は、前記作動液が直接または間接的に作用するように前記固定コアに設けられた磁歪素子を備え、
可動コア駆動用のコイルは、前記磁歪素子の周囲に前記作動液と非接触状態に配置され、前記磁歪素子の歪をインダクタンスの変化として検出する検出コイルとして兼用し、
前記可動コア駆動用のコイルに、前記可動コアを駆動するための駆動電流を供給するとともに、前記駆動電流に重畳して前記可動コア駆動用のコイルを前記検出コイルとして機能させるためのインダクタンス変化検出用の交流電流を供給する電流供給手段と、
前記可動コア駆動用のコイルの出力信号から交流信号を分離検出する手段と、
検出された交流信号から前記インダクタンスの変化として前記液圧を計測する処理を行なう手段と、を有し、
前記常閉型の電磁弁の非動作時には、前記電流供給手段から前記可動コア駆動用のコイルへ入力される交流電流の最大電流値が前記可動コアを駆動させない電流値以下に設定され、
前記常閉型の電磁弁の動作時には、前記電流供給手段から前記可動コア駆動用のコイルへ入力される交流電流の最小電流値が可動コアの動作を維持する電流値以上に設定され、
前記電子制御部は、計測された前記液圧に基づいて電磁弁を制御することを特徴とする。 (1) In order to solve the above problems, the present invention provides:
Brake fluid for a vehicle having hydraulic pressure detecting means for detecting hydraulic pressure of hydraulic fluid for braking in the flow path, and an electronic control unit for controlling an electromagnetic valve provided in the flow path based on the detected hydraulic pressure In the pressure control device,
The solenoid valve includes a normally closed solenoid valve,
The normally closed solenoid valve has a fixed core, a movable core, and a coil for driving the movable core,
The liquid pressure detection means comprises a magnetostrictive element provided in the fixed core as before Symbol hydraulic fluid acts directly or indirectly,
The coil for driving the movable core is arranged in a non-contact state with the hydraulic fluid around the magnetostrictive element, and also serves as a detection coil for detecting the strain of the magnetostrictive element as a change in inductance ,
Inductance change detection for supplying a driving current for driving the movable core to the movable core driving coil and for causing the movable core driving coil to function as the detection coil while being superimposed on the driving current. Current supply means for supplying an alternating current for use;
Means for separating and detecting an AC signal from an output signal of the movable core driving coil;
Means for measuring the hydraulic pressure as a change in the inductance from the detected AC signal,
When the normally closed solenoid valve is not in operation, the maximum current value of the alternating current input from the current supply means to the movable core driving coil is set to be equal to or less than the current value that does not drive the movable core,
During the operation of the normally closed solenoid valve, the minimum current value of the alternating current input from the current supply means to the coil for driving the movable core is set to be equal to or higher than the current value for maintaining the operation of the movable core,
The electronic control unit controls the electromagnetic valve based on the measured hydraulic pressure .

本発明によれば、磁歪素子を用いることで、制御側との電気的な接続は検出コイルだけとなり、構造が簡単で、組み付け性及びレイアウト性が向上する。また、磁歪素子と検出コイルとは、電気的及び機械的に非接触であるため、電気的及び機械的なノイズが双方に伝達しにくい。
本発明によれば、液圧検出手段を電磁弁と共に車両用ブレーキ液圧制御装置に組み付けることができ、液圧検出手段のための配置スペースが省けるため、車両用ブレーキ液圧制御装置におけるレイアウトの自由度が向上する。また、電磁弁の固定コアにおける液圧を計測することができるので、各車輪ブレーキの液圧状態を確認することができる。したがって、車両用ブレーキ液圧制御装置を精度よく制御することができる。さらに、固定コア内の磁歪素子の変形を液圧の計測に用いることで、作動液回路上に別途圧力センサを配置する必要がなく、コンパクトな車両用ブレーキ液圧制御装置とすることができる。
本発明によれば、既存の電磁弁のコイルを用いることで、別途検出コイルを配置する必要がなく、組付工数や部品点数を削減することができ、レイアウト性が向上すると共に、コンパクトな車両用ブレーキ液圧制御装置とすることができる。 According to the present invention, by using the magnetostrictive element, the electrical connection with the control side is only the detection coil, the structure is simple, and the assembling property and the layout property are improved. Further, since the magnetostrictive element and the detection coil are not in electrical and mechanical contact with each other, electrical and mechanical noise is difficult to transmit to both.
According to the present invention, the hydraulic pressure detecting means can be assembled together with the electromagnetic valve to the vehicle brake hydraulic pressure control device, and the layout space for the hydraulic pressure detecting means can be saved. The degree of freedom is improved. Moreover, since the hydraulic pressure in the fixed core of the solenoid valve can be measured, the hydraulic pressure state of each wheel brake can be confirmed. Therefore, the vehicle brake hydraulic pressure control device can be controlled with high accuracy. Furthermore, by using the deformation of the magnetostrictive element in the fixed core for measuring the hydraulic pressure, it is not necessary to separately provide a pressure sensor on the hydraulic fluid circuit, and a compact vehicle brake hydraulic pressure control device can be obtained.
According to the present invention, by using the coil of an existing solenoid valve, it is not necessary to separately arrange a detection coil, the number of assembling steps and the number of parts can be reduced, layout properties are improved, and a compact vehicle The brake fluid pressure control device can be used.

（２）本発明において、
前記磁歪素子は、前記作動液の液圧が直接的に作用する位置に配置され、かつその表面に前記作動液が直接接触しないためのコーティングが施される構成を採用しても良い。 (2) In the present invention,
The magnetostrictive element may be arranged at a position where the hydraulic pressure of the hydraulic fluid acts directly, and may be configured such that a coating is applied to the surface so that the hydraulic fluid does not come into direct contact.

本発明によれば、磁歪素子が液圧の変化に対して敏感に歪みを発生し、それをインダクタンス変化として電気的に検出することができ、精度の高い液圧の変化を計測することができる。また、磁歪素子がコーティングされていることで、磁歪素子が作動液と接触することによって劣化することを防止できる。 According to the present invention, a magnetostrictive element generates a strain sensitive to a change in hydraulic pressure, and can electrically detect it as an inductance change, and can measure a change in hydraulic pressure with high accuracy. . Further, since the magnetostrictive element is coated, it is possible to prevent the magnetostrictive element from deteriorating due to contact with the hydraulic fluid.

（３）本発明において、
前記液圧検出手段は、
前記作動液の液圧を前記磁歪素子に対して間接的に伝達する圧力伝達部材を有する構成を採用しても良い。 (3) In the present invention,
The fluid pressure detecting means is
You may employ | adopt the structure which has a pressure transmission member which transmits the hydraulic pressure of the said hydraulic fluid indirectly with respect to the said magnetostrictive element.

本発明によれば、磁歪素子が作動液と直接接触することによる劣化を防止できる。 According to the present invention, it is possible to prevent deterioration due to direct contact of the magnetostrictive element with the hydraulic fluid.

（４）本発明において、
前記磁歪素子は、前記流路に連通する有底受圧孔を有する筒状部の一部または全部として形成され、
前記検出コイルは、前記筒状部の周囲に配置される構成を採用しても良い。 (4) In the present invention,
The magnetostrictive element is formed as a part or all of a cylindrical portion having a bottomed pressure receiving hole communicating with the flow path,
The detection coil may adopt a configuration arranged around the cylindrical portion.

本発明によれば、磁歪素子が筒状部を有することで、検出コイルを磁歪素子に対して容易に配置させることができ、効率的にインダクタンスの変化を検出することができる。 According to the present invention, since the magnetostrictive element has the cylindrical portion, the detection coil can be easily arranged with respect to the magnetostrictive element, and the change in inductance can be detected efficiently.

（５）本発明において、
前記磁歪素子は、前記流路に連通する有底受圧孔を有する筒状部の一部または全部として形成され、
前記検出コイルは、前記筒状部の周囲に配置され、
前記圧力伝達部材は、前記有底受圧孔の底部に接触する押圧部と、前記液圧を受ける受圧部と、が形成され、
前記受圧部で受けた前記液圧を前記押圧部を介して前記磁歪素子に伝達する構成を採用しても良い。 (5) In the present invention,
The magnetostrictive element is formed as a part or all of a cylindrical portion having a bottomed pressure receiving hole communicating with the flow path,
The detection coil is disposed around the cylindrical portion,
The pressure transmission member includes a pressing portion that contacts a bottom portion of the bottomed pressure receiving hole, and a pressure receiving portion that receives the fluid pressure,
You may employ | adopt the structure which transmits the said hydraulic pressure received in the said pressure receiving part to the said magnetostrictive element via the said press part.

本発明によれば、磁歪素子が筒状部を有することで、検出コイルを磁歪素子に対して容易に配置させることができ、効率的にインダクタンスの変化を検出することができる。また、本発明によれば、磁歪素子が作動液と直接接触することによる劣化を防止できる。 According to the present invention, since the magnetostrictive element has the cylindrical portion, the detection coil can be easily arranged with respect to the magnetostrictive element, and the change in inductance can be detected efficiently. In addition, according to the present invention, it is possible to prevent deterioration due to direct contact of the magnetostrictive element with the hydraulic fluid.

（６）本発明において、
前記液圧検出手段は、
前記検出コイルによって発生される磁界方向に向けてバイアス磁界を前記磁歪素子に対して発生する手段をさらに有する構成を採用しても良い。 (6) In the present invention,
The fluid pressure detecting means is
You may employ | adopt the structure which further has a means to generate | occur | produce a bias magnetic field with respect to the said magnetostrictive element toward the magnetic field direction generate | occur | produced by the said detection coil.

本発明によれば、バイアス磁界を発生することで、磁歪素子の歪み変化を大きくすることができ、検出コイルによって効率的にインダクタンスの変化を検出することができる。 According to the present invention, by generating a bias magnetic field, a change in distortion of the magnetostrictive element can be increased, and a change in inductance can be efficiently detected by the detection coil.

（７）また、上記課題を解決するため、本発明に係る作動液制御用の常閉型の電磁弁は、
固定コアと、可動コアと、前記可動コア駆動用のコイルと、前記作動液の液圧が直接又は間接的に作用するように前記固定コアに配置された磁歪素子を備え、
前記固定コアの周囲に配置された前記可動コア駆動用のコイルを、前記磁歪素子の歪をインダクタンスの変化として検出するための検出コイルとして兼用し、
前記可動コア駆動用のコイルは、電流供給手段から可動コアを駆動するための駆動電流が供給されるとともに、前記駆動電流に重畳して前記可動コア駆動用のコイルを前記検出コイルとして機能させるためのインダクタンス変化検出用の交流電流が供給され、
前記可動コア駆動用のコイルの出力信号からは、交流信号を分離検出する手段を用いて前記交流信号が分離検出され、
検出された前記交流信号から前記インダクタンスの変化として前記液圧を計測する処理が行なわれ、
前記常閉型の電磁弁の非動作時には、前記電流供給手段から前記可動コア駆動用のコイルへ入力される交流電流の最大電流値が前記可動コアを駆動させない電流値以下に設定され、
前記常閉型の電磁弁の動作時には、前記電流供給手段から前記可動コア駆動用のコイルへ入力される交流電流の最小電流値が可動コアの動作を維持する電流値以上に設定されることを特徴とする。 ( 7 ) Moreover, in order to solve the said subject, the normally closed solenoid valve for hydraulic fluid control which concerns on this invention is the following.
Comprising a stationary core, a movable core, and a coil for driving the movable core, a magnetostrictive element that is disposed on the fixed core so that the liquid pressure of the hydraulic fluid acts directly or indirectly,
Said coil for said movable core drive disposed around the fixed core, also serves as a strain of the magnetostrictive element as a detection coil for detecting a change in inductance,
The movable core driving coil is supplied with a driving current for driving the movable core from the current supply means, and is superposed on the driving current so that the movable core driving coil functions as the detection coil. AC current for detecting change in inductance is supplied,
From the output signal of the coil for driving the movable core, the AC signal is separated and detected using a means for separating and detecting the AC signal,
A process of measuring the hydraulic pressure as a change in the inductance from the detected AC signal is performed,
When the normally closed solenoid valve is not in operation, the maximum current value of the alternating current input from the current supply means to the movable core driving coil is set to be equal to or less than the current value that does not drive the movable core,
During the operation of the normally closed solenoid valve, the minimum current value of the alternating current input from the current supply means to the coil for driving the movable core is set to be equal to or greater than the current value for maintaining the operation of the movable core. Features.

本発明によれば、液圧検出手段を電磁弁と共に車両用ブレーキ液圧制御装置に組み付けることができ、液圧検出手段のための配置スペースが省けるため、車両用ブレーキ液圧制御装置におけるレイアウトの自由度が向上する。 According to the present invention, the hydraulic pressure detecting means can be assembled together with the electromagnetic valve to the vehicle brake hydraulic pressure control device, and the layout space for the hydraulic pressure detecting means can be saved. The degree of freedom is improved.

さらに、このように磁歪素子を用いることで、制御側との電気的な接続は検出コイルだけとなり、電磁弁の組み付け性を低下させることなく電磁弁における液圧を検出することができる。また、磁歪素子は、制御側と電気的及び機械的に非接触で構成することができるため、電磁弁の構造をあまり複雑にすることなく固定コアに配置させることができる。 Further, by using the magnetostrictive element in this way, the electrical connection with the control side is only the detection coil, and the hydraulic pressure in the electromagnetic valve can be detected without degrading the assembling property of the electromagnetic valve. Further, since the magnetostrictive element can be configured in a non-contact manner electrically and mechanically with the control side, it can be arranged on the fixed core without making the structure of the electromagnetic valve so complicated.

本発明によれば、既存の電磁弁のコイルを用いることで、別途検出コイルを配置する必要がなく、組付工数や部品点数を削減することができる。 According to the present invention, by using the coil of the existing solenoid valve, it is not necessary to separately arrange a detection coil, and the number of assembling steps and the number of parts can be reduced.

本発明によれば、電磁弁の作動中であっても、コイルの出力信号から液圧を計測することができる。 According to the present invention, the hydraulic pressure can be measured from the output signal of the coil even during operation of the solenoid valve.

以下、本発明の実施の形態について、図面を参照して詳細に説明する。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

図１は、車両用ブレーキ液圧制御装置の正面図である。図２〜６は、参考例１〜５に係る車両用ブレーキ制御装置の液圧検出手段の縦断面図である。図７、図８、図１０及び図１１は、液圧の検出を説明する各種波形図である。図９は、本発明の実施の形態に係る車両用ブレーキ液圧制御装置の常閉型の電磁弁の縦断面図である。図１２は、電子制御部を説明するブロック図である。 Figure 1 is a front view of a vehicle dual brake fluid pressure control device. FIGS. 2-6 is a longitudinal cross-sectional view of the hydraulic-pressure detection means of the vehicle brake control apparatus which concerns on the reference examples 1-5 . 7, 8, 10 and 11 are various waveform diagrams for explaining the detection of the hydraulic pressure. FIG. 9 is a longitudinal sectional view of a normally closed electromagnetic valve of the vehicle brake hydraulic pressure control device according to the embodiment of the present invention. FIG. 12 is a block diagram illustrating the electronic control unit.

図１に示す車両用ブレーキ液圧制御装置１は、自動車等の各車輪のブレーキ本体（図示せず）に作用するブレーキ用の作動液の液圧（ブレーキ液圧）を制御するものである。 Shown to VEHICLE brake fluid pressure control device 1 in Figure 1 is intended to control the hydraulic fluid for the brake acting on each wheel brake body such as an automobile (not shown) hydraulic (brake fluid pressure) .

車両用ブレーキ液圧制御装置１は、作動液の流出入を制御する複数の電磁弁１０や流路５における作動液の液圧を検出する液圧検出手段（圧力センサ）７０などを有する液圧制御部Ａと、検出された液圧に基づいて流路に設けられた電磁弁１０を制御する電気制御する電子制御部Ｂと、を有する。 The vehicular brake hydraulic pressure control device 1 includes a plurality of solenoid valves 10 that control the inflow and outflow of hydraulic fluid, hydraulic pressure detection means (pressure sensor) 70 that detects the hydraulic pressure of hydraulic fluid in the flow path 5, and the like. It has the control part A and the electronic control part B which controls electrically the electromagnetic valve 10 provided in the flow path based on the detected hydraulic pressure.

液圧制御部Ａは、作動液の流路５が形成された金属製のハウジング４に配置された複数の電磁弁１０と、作動液の流路５の途中に配置された液圧検出手段７０と、図示せぬプランジャポンプ駆動装置やプランジャポンプなどの油圧部品と、ハウジング４に固定されプランジャポンプを駆動するための電動モータ２と、を有する。 The hydraulic pressure control unit A includes a plurality of electromagnetic valves 10 arranged in a metal housing 4 in which a hydraulic fluid flow path 5 is formed, and hydraulic pressure detection means 70 arranged in the middle of the hydraulic fluid flow path 5. And a hydraulic component such as a plunger pump driving device and a plunger pump (not shown), and an electric motor 2 fixed to the housing 4 for driving the plunger pump.

電子制御部Ｂは、カバー３内に配置された基板８と、基板８に形成された複数の電子部品を含む回路と、を含み、液圧制御部Ａの電動モータ２、電磁弁１０、液圧検出手段７０などと電気的に接続されている。 The electronic control unit B includes a substrate 8 disposed in the cover 3 and a circuit including a plurality of electronic components formed on the substrate 8, and includes the electric motor 2, the electromagnetic valve 10, and the liquid of the hydraulic control unit A. It is electrically connected to the pressure detecting means 70 and the like.

液圧検出手段７０は、図１〜６及び図９に示すように、作動液の液圧が直接または間接的に作用するように設けられた磁歪素子７２と、磁歪素子７２の周囲に作動液と非接触状態に配置され、磁歪素子７２の歪をインダクタンスの変化として検出する検出コイル７３（２４）と、を備え、インダクタンスの変化として液圧を計測する。 Hydraulic pressure detecting means 70, as shown in FIGS. 1-6 and 9, the magnetostrictive element 72 the fluid pressure of the hydraulic fluid is provided to act directly or indirectly, hydraulic fluid around the magnetostrictive element 72 And a detection coil 73 (24) that detects the strain of the magnetostrictive element 72 as a change in inductance, and measures the hydraulic pressure as a change in inductance.

このように液圧検出手段７０に磁歪素子７２を用いることで、制御側との電気的な接続は検出コイル７３だけとなり、構造が簡単で、組み付け性及びレイアウト性が向上する。また、磁歪素子７２と検出コイル７３とは、電気的及び機械的に非接触であるため、電気的及び機械的なノイズが双方に伝達しにくい。 Thus, by using the magnetostrictive element 72 for the hydraulic pressure detecting means 70, the electrical connection with the control side is only the detection coil 73, the structure is simple, and the assembling property and the layout property are improved. In addition, since the magnetostrictive element 72 and the detection coil 73 are not in electrical and mechanical contact, it is difficult for electrical and mechanical noise to be transmitted to both.

（参考例１）
参考例１に係る車両用ブレーキ制御装置１の液圧検出手段７０は、図２に示すように、作動液の流路５の途中に配置される。 ( Reference Example 1 )
As shown in FIG. 2, the hydraulic pressure detection means 70 of the vehicle brake control device 1 according to the reference example 1 is disposed in the middle of the hydraulic fluid flow path 5.

磁歪素子７２は、作動液の液圧が直接的に作用する位置に配置され、かつその表面に作動液が直接接触しないためのコーティングが施されている。コーティングの種類は、磁歪素子７２が作動液と接触することで劣化しないためのものであれば、適宜採用することができる。 The magnetostrictive element 72 is disposed at a position where the hydraulic pressure of the hydraulic fluid acts directly, and a coating is applied to the surface so that the hydraulic fluid does not directly contact. The type of coating can be appropriately employed as long as it does not deteriorate when the magnetostrictive element 72 comes into contact with the hydraulic fluid.

このように磁歪素子７２に対して作動液が直接的に作用することで、液圧の変化に対して敏感に歪みを発生することができ、精度の高い液圧の変化を計測することができる。また、磁歪素子７２がコーティングされていることで、磁歪素子７２が作動液と接触することによって劣化することを防止できる。 As described above, since the working fluid directly acts on the magnetostrictive element 72, it is possible to generate distortion sensitive to changes in hydraulic pressure, and to measure changes in hydraulic pressure with high accuracy. . In addition, since the magnetostrictive element 72 is coated, it is possible to prevent the magnetostrictive element 72 from being deteriorated due to contact with the hydraulic fluid.

磁歪素子７２は、流路５に連通する有底受圧孔７２２を有する筒状部７２０と、ハウジング４に固定するためのフランジ状の取付部７２１と、を有し、磁歪素子７２は、筒状部７２０及び取付部７２１の全部として形成されている。磁歪素子７２は、取付部７２１を装着孔６内に配置させ、取付部７２１から延在する筒上部７２０をハウジング４の端面から突出させて配置している。 The magnetostrictive element 72 includes a cylindrical portion 720 having a bottomed pressure receiving hole 722 communicating with the flow path 5 and a flange-shaped attachment portion 721 for fixing to the housing 4. The magnetostrictive element 72 is cylindrical. The part 720 and the attachment part 721 are formed as a whole. In the magnetostrictive element 72, the mounting portion 721 is disposed in the mounting hole 6, and the cylindrical upper portion 720 extending from the mounting portion 721 is disposed so as to protrude from the end surface of the housing 4.

検出コイル７３は、リング状であって、ハウジング４から突出した筒状部７２０の周囲に非接触の状態を維持して配置されている。なお、参考例１の磁歪素子７２は、筒状部７２０の全部として形成されたが、液圧による歪みが検出できる範囲で筒状部７２０の一部として形成しても良い。 The detection coil 73 has a ring shape and is arranged in a non-contact state around the cylindrical portion 720 protruding from the housing 4. In addition, although the magnetostrictive element 72 of the reference example 1 was formed as the whole cylindrical part 720, you may form as a part of the cylindrical part 720 in the range which can detect the distortion by a hydraulic pressure.

このように磁歪素子７２が筒状部７２０を有することで、検出コイル７３を磁歪素子７２に対して容易に配置させることができ、効率的に磁歪素子７２の歪みによるインダクタンスの変化を検出することができる。 Since the magnetostrictive element 72 has the cylindrical portion 720 as described above, the detection coil 73 can be easily arranged with respect to the magnetostrictive element 72, and an inductance change due to distortion of the magnetostrictive element 72 can be efficiently detected. Can do.

磁歪素子７２の取付部７２１は、ハウジング４に流路５と連通して形成された複数の装着孔６の一つに配置され、流路５側の一方の端面を例えばＯリングのようなシール部材９によってシールされるとともに、他方の端面を例えばリング状の係止部材７によって抜け止めされている。 The attachment portion 721 of the magnetostrictive element 72 is disposed in one of a plurality of mounting holes 6 formed in the housing 4 so as to communicate with the flow path 5, and one end face on the flow path 5 side is sealed with, for example, an O-ring. While being sealed by the member 9, the other end face is prevented from coming off by, for example, a ring-shaped locking member 7.

検出コイル７３は、電子制御部Ｂの電気回路と接続するための接続端子７４を有する。接続端子７４は、検出コイル７３から電子制御部Ｂ側へ延在し、図示せぬ電気回路と電気的に接続すると共に、検出コイル７３を所定位置に配置させている。 The detection coil 73 has a connection terminal 74 for connecting to the electric circuit of the electronic control unit B. The connection terminal 74 extends from the detection coil 73 toward the electronic control unit B, is electrically connected to an electric circuit (not shown), and has the detection coil 73 disposed at a predetermined position.

したがって、流路５の液圧が上昇すると、磁歪素子７２の有底受圧孔７２２内の液圧も上昇し、比較的薄肉に形成された筒状部７２０が伸ばされる様に変形する。この変形、すなわち歪みは、外部磁界におけるインダクタンスの変化として表れ、この結果、検出コイル７２の電流値もしくは電圧値が変化することになる。 Therefore, when the fluid pressure in the flow path 5 increases, the fluid pressure in the bottomed pressure receiving hole 722 of the magnetostrictive element 72 also increases, and the tubular portion 720 formed to be relatively thin is deformed so as to be extended. This deformation, that is, distortion appears as a change in inductance in the external magnetic field, and as a result, the current value or voltage value of the detection coil 72 changes.

次に、参考例１における液圧を検出する方法について、図７を用いて説明する。図７のグラフＡは検出コイル７３への入力電流特性を示し、グラフＢは流路５における液圧の変化を示し、グラフＣは検出コイル７３におけるインダクタンスの変化を示し、グラフＤは検出コイル７３から出力される電圧特性を示し、グラフＥはグラフＤの電圧特性を整流化したものであり、グラフＦは液圧検出手段７０によって計測された圧力変化を示す。なお、図７におけるグラフＡ〜Ｆの横軸は時間経過を示す。 Next, a method for detecting the hydraulic pressure in Reference Example 1 will be described with reference to FIG. A graph A in FIG. 7 shows the input current characteristic to the detection coil 73, a graph B shows a change in hydraulic pressure in the flow path 5, a graph C shows a change in inductance in the detection coil 73, and a graph D shows a detection coil 73. The graph E shows the voltage characteristics outputted from the graph D, the graph E shows the voltage characteristics of the graph D rectified, and the graph F shows the pressure change measured by the hydraulic pressure detection means 70. In addition, the horizontal axis of graphs A to F in FIG.

図７のグラフＡに示すように、検出コイル７３には一定振幅の交流電流が入力されている。グラフＢに示すように流路５の液圧を変化させたとき、磁歪素子７２は歪み、グラフＣに示すようなインダクタンスの変化が起こる。このようなインダクタンスの変化は、電子制御部Ｂ内の分離検出手段（例えばＢＰＦ：バンドパスフィルタ）によって入力電圧と分離され、グラフＤに示すような検出コイル７３の両端間の電圧の変化となって現れる。電子制御部Ｂは、このグラフＤの電圧波形を整流化してグラフＥを得て、さらに、これを平滑化すると共に圧力に換算することでグラフＦに示すような流路５における液圧の変化を計測することができる。 As shown in graph A of FIG. 7, an alternating current having a constant amplitude is input to the detection coil 73. When the hydraulic pressure in the flow path 5 is changed as shown in the graph B, the magnetostrictive element 72 is distorted, and an inductance change as shown in the graph C occurs. Such a change in inductance is separated from the input voltage by the separation detection means (for example, BPF: bandpass filter) in the electronic control unit B, and becomes a change in voltage between both ends of the detection coil 73 as shown in the graph D. Appear. The electronic control unit B rectifies the voltage waveform of the graph D to obtain the graph E, and further smoothes this and converts it to pressure, thereby changing the hydraulic pressure in the flow path 5 as shown in the graph F. Can be measured.

なお、一般に、磁歪素子の特性として検出コイル７３の入力電流が０（Ａ）付近において磁歪素子７２の変形量（インダクタンス変化）は最小となる。したがって、検出コイル７３に入力される交流電流は、グラフＡに示すように、一方にバイアスした交流電流であって、電圧波形の変化が確実に検出できる程度に最低入力電流値が設定されている。 In general, as a characteristic of the magnetostrictive element, the deformation amount (inductance change) of the magnetostrictive element 72 is minimized when the input current of the detection coil 73 is around 0 (A). Therefore, as shown in the graph A, the alternating current input to the detection coil 73 is an alternating current biased to one side, and the minimum input current value is set to such an extent that a change in the voltage waveform can be reliably detected. .

（参考例２）
参考例２に係る車両用ブレーキ制御装置１の液圧検出手段７０は、参考例１に係る液圧検出手段７０と似ているが、図３に示すように、作動液の液圧を磁歪素子７２に対して間接的に伝達する圧力伝達部材７８を有している点などで異なる。以下、参考例１と重複する部分については、同一符号を付して説明は省略する。 ( Reference Example 2 )
The hydraulic pressure detection means 70 of the vehicle brake control device 1 according to the reference example 2 is similar to the hydraulic pressure detection means 70 according to the reference example 1. However, as shown in FIG. The difference is that a pressure transmission member 78 that indirectly transmits the pressure is provided. In the following, portions that are the same as those in Reference Example 1 are assigned the same reference numerals and description thereof is omitted.

液圧検出手段７０は、磁歪素子７２と作動液との接触を防ぐため、流路に連通する有底受圧孔７２２の内周面を覆うように配置された円筒状のカバー部材７６を有している。カバー部材７６は、圧力伝達部材７８が配置された貫通孔７６２と、磁歪素子７２の取付部７２１と重ねあわされて組みつけられるフランジ部７６１と、を有する。カバー部材７６のフランジ部７６１は、磁歪素子７２と共に装着孔６に液密に配置されている。 The hydraulic pressure detecting means 70 has a cylindrical cover member 76 disposed so as to cover the inner peripheral surface of the bottomed pressure receiving hole 722 communicating with the flow path in order to prevent contact between the magnetostrictive element 72 and the hydraulic fluid. ing. The cover member 76 includes a through-hole 762 in which the pressure transmission member 78 is disposed, and a flange portion 761 that is overlapped and assembled with the attachment portion 721 of the magnetostrictive element 72. The flange portion 761 of the cover member 76 is liquid-tightly disposed in the mounting hole 6 together with the magnetostrictive element 72.

圧力伝達部材７８は、円柱状であって、磁歪素子７２の有底受圧孔７２２の底部７２３に接触する押圧部７８１と、流路５側で作動液の液圧を受ける受圧部７８２と、が円柱の各端面に形成されている。圧力伝達部材７８は、その受圧部７８２と貫通孔７６２の途中の段差部に配置された例えばスプリングからなる弾性部材７７によって押圧部７８１を底部７２３に対し常時付勢されている。また、圧力伝達部材７８の外周面と貫通孔７６２の内壁面とは、シール部材９１によってシールされると共に、貫通孔７６２の内壁面に沿って進退可能に配置されている。 The pressure transmission member 78 has a cylindrical shape, and includes a pressing portion 781 that contacts the bottom portion 723 of the bottomed pressure receiving hole 722 of the magnetostrictive element 72 and a pressure receiving portion 782 that receives the hydraulic pressure of the working fluid on the flow path 5 side. It is formed on each end face of the cylinder. In the pressure transmission member 78, the pressing portion 781 is constantly urged against the bottom portion 723 by an elastic member 77 made of, for example, a spring disposed at a step portion in the middle of the pressure receiving portion 782 and the through hole 762. Further, the outer peripheral surface of the pressure transmission member 78 and the inner wall surface of the through hole 762 are sealed by the seal member 91 and disposed so as to advance and retreat along the inner wall surface of the through hole 762.

したがって、受圧部７８２で受けた液圧を押圧部７８１を介して磁歪素子７２に伝達することで、磁歪素子７２に歪みを発生させる。この歪みを、参考例１と同様に、筒状部７２０の周囲に配置された検出コイル７３によって得られた電圧波形の変化として検出し、圧力に換算することで、液圧の変化を計測することができる。 Therefore, the hydraulic pressure received by the pressure receiving portion 782 is transmitted to the magnetostrictive element 72 via the pressing portion 781, thereby generating distortion in the magnetostrictive element 72. Similar to Reference Example 1 , this distortion is detected as a change in the voltage waveform obtained by the detection coil 73 disposed around the cylindrical portion 720, and the change in the hydraulic pressure is measured by converting it into a pressure. be able to.

このように、磁歪素子７２を作動液と直接接触させることがないので、磁歪素子７２の劣化を防止することができる。 Thus, since the magnetostrictive element 72 is not brought into direct contact with the hydraulic fluid, the deterioration of the magnetostrictive element 72 can be prevented.

（参考例３）
参考例３に係る車両用ブレーキ制御装置１の液圧検出手段７０の磁歪素子７２は、図４に示すように、収容部材８１内に収容され、液圧の上昇によって磁歪素子７２が圧縮方向に歪む点などが参考例１，２とは異なる。 ( Reference Example 3 )
As shown in FIG. 4, the magnetostrictive element 72 of the hydraulic pressure detecting means 70 of the vehicle brake control device 1 according to the reference example 3 is accommodated in the accommodating member 81, and the magnetostrictive element 72 is compressed in the compression direction due to an increase in hydraulic pressure. The distorted points are different from the reference examples 1 and 2 .

収容部材８１は、流路５と連通する収容孔８６を有する円筒状の収容筒部材８２と、流路５とは反対側に形成された収容孔８６の開口を閉塞する収容蓋部材８４と、を有する。収容筒部材８２の一端は、ハウジング４の装着孔６に液密に固定されている。収容孔８６は、略円柱状の磁歪素子７２が収容されている部分の内径よりも流路５に連通する側の内径が細く形成され、内径が変化する段差部に弾性部材７７が配置されている。 The accommodation member 81 includes a cylindrical accommodation cylinder member 82 having an accommodation hole 86 communicating with the flow path 5, an accommodation lid member 84 that closes an opening of the accommodation hole 86 formed on the side opposite to the flow path 5, and Have One end of the housing cylinder member 82 is liquid-tightly fixed to the mounting hole 6 of the housing 4. The accommodation hole 86 is formed such that the inner diameter on the side communicating with the flow path 5 is narrower than the inner diameter of the portion in which the substantially cylindrical magnetostrictive element 72 is accommodated, and the elastic member 77 is disposed at the step portion where the inner diameter changes. Yes.

磁歪素子７２は、円柱状であって、一方の端面が収容蓋部材８４に接触して移動が規制されている。磁歪素子７２の他方の端面は、流路５側にあって、作動液の液圧を受けるとともに、磁歪素子７２の他方の端面と段差部との間に配置された弾性部材７７の付勢力を受ける。したがって、磁歪素子７２は、弾性部材の付勢力によって収容蓋部材８４側に常時押し付けられている。 The magnetostrictive element 72 has a cylindrical shape, and one end surface thereof is in contact with the housing lid member 84 and its movement is restricted. The other end face of the magnetostrictive element 72 is on the flow path 5 side, receives the hydraulic pressure of the hydraulic fluid, and applies the biasing force of the elastic member 77 disposed between the other end face of the magnetostrictive element 72 and the stepped portion. receive. Therefore, the magnetostrictive element 72 is always pressed against the housing lid member 84 by the biasing force of the elastic member.

また、収容孔８６の内周面には、液圧による磁歪素子７２の縦軸方向の圧縮変形による周方向への膨張変形を許容する溝８２１が形成されている。収容孔８６の内周面の溝は磁歪素子７２のほぼ縦軸方向の全長に渡って形成され、収容孔８６の内周面は磁歪素子７２の両端部外周面とのみ接触している。 In addition, a groove 821 that allows expansion deformation in the circumferential direction due to compressive deformation in the longitudinal direction of the magnetostrictive element 72 due to hydraulic pressure is formed on the inner peripheral surface of the accommodation hole 86. The groove on the inner peripheral surface of the accommodation hole 86 is formed over the entire length of the magnetostrictive element 72 in the direction of the longitudinal axis, and the inner peripheral surface of the accommodation hole 86 is in contact only with the outer peripheral surfaces of both ends of the magnetostrictive element 72.

検出コイル７３はハウジング４の端面から突出した収容筒部材８２の周囲に配置されている。また、検出コイル７３から延在する接続端子７４は、参考例１、２と同様に、電子制御部Ｂの回路と接続されている。 The detection coil 73 is disposed around the accommodating cylinder member 82 protruding from the end face of the housing 4. The connection terminals 74 extending from the detection coil 73, in the same manner as in Reference Example 1 and 2 are connected to the circuit of the electronic control unit B.

したがって、流路５の液圧が上昇すると、液圧によって磁歪素子７２が収容蓋部材８４側へ押されて圧縮歪みが発生する。この圧縮歪みは、インダクタンスの変化となり、検出コイル７２の両端間における電圧値が変化することになる。電子制御部Ｂは、このようにして得られた出力信号すなわち電圧波形の変化を、圧力に換算することで、液圧の変化を計測することができる。 Therefore, when the fluid pressure in the flow path 5 rises, the magnetostrictive element 72 is pushed toward the housing lid member 84 by the fluid pressure, and compressive strain is generated. This compressive strain results in a change in inductance, and the voltage value across the detection coil 72 changes. The electronic control unit B can measure the change in the hydraulic pressure by converting the output signal thus obtained, that is, the change in the voltage waveform, into a pressure.

参考例３の場合、参考例１、２と異なり、液圧の上昇によって磁歪素子に圧縮歪みが生じるため、検出コイル７３におけるインダクタンスの変化も参考例１、２とは逆に現れる。 In the case of the reference example 3 , unlike the reference examples 1 and 2 , since the compressive strain is generated in the magnetostrictive element due to the increase of the hydraulic pressure, the change in the inductance in the detection coil 73 also appears opposite to the reference examples 1 and 2 .

このように、磁歪素子７２が一方の端部の移動を規制されて収容部材８１内に配置することで、磁歪素子７２を単純形状とすることができ、安定した歪み−インダクタンス特性を得ることができる。 As described above, the magnetostrictive element 72 is arranged in the accommodating member 81 with the movement of one end thereof being restricted, so that the magnetostrictive element 72 can have a simple shape, and a stable strain-inductance characteristic can be obtained. it can.

（参考例４）
参考例４に係る車両用ブレーキ制御装置１の液圧検出手段７０は、参考例３に係る液圧検出手段７０と似ているが、図５に示すように、作動液の液圧を磁歪素子７２に対して間接的に伝達する圧力伝達部材７８を有している点で異なる。以下、参考例３と重複する部分については、同一符号を付して説明は省略する。 ( Reference Example 4 )
The hydraulic pressure detecting means 70 of the vehicle brake control device 1 according to the reference example 4 is similar to the hydraulic pressure detecting means 70 according to the reference example 3 , but as shown in FIG. 72 in that it has a pressure transmission member 78 that indirectly transmits the pressure. In the following, portions that are the same as those in Reference Example 3 are given the same reference numerals and description thereof is omitted.

圧力伝達部材７８は、収容孔８６の内径とほぼ同じ外径を有する薄い円板状であって、弾性部材７７と磁歪素子７２との間に配置される。圧力伝達部材７８には、磁歪素子７２に接触する押圧面と、流路５側で作動液の液圧及び弾性部材７７の付勢力を受ける受圧面と、が形成されている。また、圧力伝達部材７８は、その外周面にシール部材９１が配置され、収容孔８６の内周面に対し液密状態のまま摺動可能である。したがって、圧力伝達部材７８は、作動液と磁歪素子７２が直接接触することを防止することができる。 The pressure transmission member 78 is a thin disk having an outer diameter substantially the same as the inner diameter of the accommodation hole 86, and is disposed between the elastic member 77 and the magnetostrictive element 72. The pressure transmission member 78 is formed with a pressing surface that contacts the magnetostrictive element 72 and a pressure receiving surface that receives the hydraulic pressure of the hydraulic fluid and the urging force of the elastic member 77 on the flow path 5 side. Further, the pressure transmission member 78 has a seal member 91 disposed on the outer peripheral surface thereof, and can slide in a liquid-tight state with respect to the inner peripheral surface of the accommodation hole 86. Therefore, the pressure transmission member 78 can prevent the hydraulic fluid and the magnetostrictive element 72 from coming into direct contact.

参考例４に係る液圧検出手段７０は、作動液の液圧を圧力伝達部材７８を介して磁歪素子７２に伝達することで、磁歪素子７２に歪みを発生させる。この歪みを参考例３と同様に収容筒部材８２の周囲に配置された検出コイル７３によって得られた電圧波形の変化として検出し、圧力に換算することで、液圧の変化を計測することができる。 The hydraulic pressure detecting means 70 according to the reference example 4 causes the magnetostrictive element 72 to be distorted by transmitting the hydraulic pressure of the hydraulic fluid to the magnetostrictive element 72 via the pressure transmission member 78. In the same manner as in Reference Example 3, this distortion is detected as a change in the voltage waveform obtained by the detection coil 73 arranged around the accommodating cylinder member 82, and converted into a pressure to measure the change in the hydraulic pressure. it can.

（参考例５）
参考例５に係る車両用ブレーキ制御装置１の液圧検出手段７０の特徴は、前記（参考例１）〜（参考例３）のように検出コイル７３の入力電流として、バイアス電流を用いないことである。以下、参考例４と重複する部分については、同一符号を付して説明は省略する。 ( Reference Example 5 )
The feature of the hydraulic pressure detecting means 70 of the vehicle brake control device 1 according to the reference example 5 is that no bias current is used as the input current of the detection coil 73 as in the above ( reference example 1 ) to ( reference example 3 ). It is. In the following, portions that overlap with Reference Example 4 are assigned the same reference numerals and description thereof is omitted.

参考例５に係る液圧検出手段７０は、円柱形の磁歪素子７２の両端面に第１、第２の磁石８８．８９を配置させている。第１の磁石８８は磁歪素子７２の一方の端面と収容蓋部材８４との間に挟持され、第２の磁石８９は磁歪素子７２の他方の端面と圧力伝達部材７８との間に挟持されている。 In the hydraulic pressure detecting means 70 according to the reference example 5 , first and second magnets 88.89 are arranged on both end faces of a cylindrical magnetostrictive element 72. The first magnet 88 is sandwiched between one end face of the magnetostrictive element 72 and the housing lid member 84, and the second magnet 89 is sandwiched between the other end face of the magnetostrictive element 72 and the pressure transmission member 78. Yes.

これら第１、第２の磁石８８，８９は、一方のＮ極と他方のＳ極とを相対向させて磁束を発生させ、検出コイル７３によって発生される磁界方向に向けてバイアス磁界を磁歪素子７２に対して発生する手段である。 The first and second magnets 88 and 89 generate a magnetic flux by making one N pole and the other S pole face each other, and apply a bias magnetic field in the direction of the magnetic field generated by the detection coil 73 to the magnetostrictive element. 72 is a means that occurs for 72.

図８には、図７と同様、参考例５における液圧の検出方法が示されている。図８のグラフＧは検出コイル７３への入力電流特性を示し、グラフＨは流路５における液圧の変化を示し、グラフＩは検出コイル７３におけるインダクタンスの変化を示し、グラフＪは検出コイル７３から出力される電圧特性を示し、グラフＫはグラフＬの電圧特性を整流化したものであり、グラフＬは液圧検出手段７０によって検出された圧力変化を示す。なお、図８におけるグラフＧ〜Ｌの横軸は時間経過を示す。 FIG. 8 shows a method of detecting the hydraulic pressure in Reference Example 5, as in FIG. The graph G in FIG. 8 shows the input current characteristics to the detection coil 73, the graph H shows the change in hydraulic pressure in the flow path 5, the graph I shows the change in inductance in the detection coil 73, and the graph J shows the detection coil 73. The graph K shows the voltage characteristic output from the rectifier, the graph K is a rectification of the voltage characteristic of the graph L, and the graph L shows the pressure change detected by the hydraulic pressure detection means 70. In addition, the horizontal axis of the graphs G to L in FIG.

参考例５のように、あらかじめバイアス磁界を発生させることで、図８のグラフＧに示すように、０（Ａ）を中心に振幅する交流電流を入力させても、グラフＨの液圧変化に対して、グラフＩに示すようなインダクタンスの変化を得ることができる。したがって、参考例１〜４と同様に、電子制御部Ｂ内の分離検出手段（例えばＢＰＦ：バンドパスフィルタ）によって入力電圧と分離され、グラフＪに示すような電圧変化が得られ、電子制御部Ｂは、これをグラフＫのように整流化した後、平滑化して圧力換算するとグラフＬに示すような液圧変化を計測することができる。 By generating a bias magnetic field in advance as in Reference Example 5 , even if an alternating current with an amplitude centering on 0 (A) is input as shown in the graph G of FIG. On the other hand, a change in inductance as shown in graph I can be obtained. Accordingly, as in Reference Examples 1 to 4 , the input voltage is separated by the separation detection means (for example, BPF: bandpass filter) in the electronic control unit B, and a voltage change as shown in the graph J is obtained. When B is rectified as in graph K and then smoothed and converted into pressure, a change in hydraulic pressure as shown in graph L can be measured.

このようにあらかじめバイアス磁界を発生することで、磁歪素子７２の歪み変化によるインダクタンス変化を効率的に検出することができる。 Thus, by generating a bias magnetic field in advance, it is possible to efficiently detect an inductance change due to a strain change of the magnetostrictive element 72.

（本発明の一実施の形態）
本発明の一実施の形態に係る車両用ブレーキ制御装置１は、上記参考例１〜５のいずれかに係る液圧検出手段７０を車両用ブレーキ液圧制御装置１の常閉型の電磁弁１０の固定コア２２に設けることができる。つまり、作動液制御用の電磁弁１０は、作動液の液圧が直接又は間接的に作用するように固定コア２２に配置された磁歪素子７２と、固定コア２２の周囲に、磁歪素子の歪をインダクタンスの変化として検出するために配置された検出コイルと兼用する可動コア３２駆動用のコイル２４と、を備え、インダクタンスの変化として液圧を計測する。 ( One embodiment of the present invention )
The vehicular brake control device 1 according to an embodiment of the present invention uses the hydraulic pressure detection means 70 according to any one of the reference examples 1 to 5 as a normally closed electromagnetic valve 10 of the vehicular brake hydraulic pressure control device 1. The fixed core 22 can be provided. In other words, the electromagnetic valve 10 for controlling the hydraulic fluid includes a magnetostrictive element 72 disposed on the fixed core 22 so that the hydraulic pressure of the hydraulic fluid acts directly or indirectly, and a distortion of the magnetostrictive element around the fixed core 22. And a coil 24 for driving the movable core 32, which is also used as a detection coil arranged to detect the change in inductance, and the hydraulic pressure is measured as the change in inductance.

本発明の一実施の形態に係る車両用ブレーキ制御装置１の常閉型の電磁弁１０は、図９に示すように、固定コア２２に液圧検出手段７０が設けられている。以下、この常閉型の電磁弁１０の構造について説明する。 Solenoid valve 10 of the normally closed vehicular brake control system 1 according to an embodiment of the present invention, as shown in FIG. 9, the liquid pressure detecting means 70 is provided on the fixed core 22. Hereinafter, the structure of the normally closed electromagnetic valve 10 will be described.

（常閉型の電磁弁の構造）
常閉型の電磁弁１０は、ハウジング４の装着孔６内に挿入され、カシメ部９３でカシメ固定された薄肉円筒状のボディ２０と、ボディ２０の一端に固定された固定コア２２と、通電によって固定コア２２を励磁させるコイル２４と、コイル２４を覆うヨーク２４aと、弁座４２に対し着座可能に対向配置され、作動液の流入口５２と流出口５１を開閉する弁部としての弁体３０と、固定コア２２と弁座との間に配置され、弁座に対し弁体３０と共に進退可能な可動コア３２と、固定コア２２と可動コア３２の間にあって、弁座４２に対し弁体３０が着座し閉弁する閉弁方向に、可動コア３２を付勢する弾性付勢部材としてのばね部材３４と、を有する。コイル２４は、コイル２４へ通電する電流値を制御する電子制御部Ｂの基板８と接続端子２５を介してに電気的に接続されている。コイル２４を覆う磁性材料からなるヨーク２４ａは、固定コア２２と磁気的に結合される。したがって、コイル２４の通電によって、可動コア３２と固定コア２２との間に吸引力を発生させ、可動コア３２を閉弁状態の初期位置からばね部材３４の付勢力としてのばね力に抗し開弁方向に後退させる。 (Structure of normally closed solenoid valve)
The normally closed solenoid valve 10 is inserted into the mounting hole 6 of the housing 4, and has a thin cylindrical body 20 that is crimped and fixed by a crimping portion 93, a fixed core 22 that is fixed to one end of the body 20, The coil 24 that excites the fixed core 22 by the above, the yoke 24a that covers the coil 24, and the valve seat 42 are disposed so as to face each other so as to be able to be seated. 30, a movable core 32 that is disposed between the fixed core 22 and the valve seat, can move forward and backward together with the valve body 30 with respect to the valve seat, and is located between the fixed core 22 and the movable core 32, with respect to the valve seat 42. And a spring member 34 as an elastic biasing member that biases the movable core 32 in the valve closing direction in which the seat 30 is seated and closes. The coil 24 is electrically connected to the substrate 8 of the electronic control unit B that controls the value of the current supplied to the coil 24 via the connection terminal 25. A yoke 24 a made of a magnetic material covering the coil 24 is magnetically coupled to the fixed core 22. Therefore, the coil 24 is energized to generate a suction force between the movable core 32 and the fixed core 22, and the movable core 32 is opened against the spring force as the urging force of the spring member 34 from the initial position in the valve closed state. Retract in the valve direction.

（ボディ）
ボディ２０は、非磁性材料からなる薄肉円筒状のいわゆるスリーブであって、その一端には固定コア２２が固定され、他端内側には弁座体４０が固定され、可動コア３２が固定コア２２と弁座体４０との間で進退可能に配置され、弁座体４０が固定された他端をハウジング４の装着孔６内に挿入されている。ボディ２０の他端側の外周面は、ハウジング４の装着孔６との間でカシメ部９３と複数の環状シール部材９２によって作動液に対し液密にシールされている。ボディ２０は、ハウジング４に形成された作動液の流路５に対して開口する流入口５２と流出口５１とを有し、流出口５１に円筒状の弁座体４０が装着されている。ハウジング４から外部に突出したボディ２０の外側には、樹脂製のボビン２６に巻装されたコイル２４が取り付けられている。 (body)
The body 20 is a thin cylindrical so-called sleeve made of a nonmagnetic material, and a fixed core 22 is fixed to one end thereof, a valve seat body 40 is fixed to the inner side of the other end, and a movable core 32 is fixed to the fixed core 22. The other end to which the valve seat body 40 is fixed is inserted into the mounting hole 6 of the housing 4. The outer peripheral surface on the other end side of the body 20 is hermetically sealed against the hydraulic fluid by the caulking portion 93 and a plurality of annular seal members 92 between the mounting hole 6 of the housing 4. The body 20 has an inflow port 52 and an outflow port 51 that open to the hydraulic fluid flow path 5 formed in the housing 4, and a cylindrical valve seat body 40 is attached to the outflow port 51. A coil 24 wound around a resin bobbin 26 is attached to the outside of the body 20 protruding outward from the housing 4.

（可動コア）
可動コア３２は、磁性材料からなる略円柱形状であって、固定コア２２に対向配置されている。可動コア３２は、固定コア２２に対向する一方の端部に横断面円形の凹部３２１が開口形成され、弁座体４０に対向する先細り形状の他方の端部に球状の弁体３０が圧入されている。凹部３２１内には、ばね部材３４が凹部３２１に、固定コア２２と可動コア３２との間に縮設されるようにして配置されている。可動コア３２は、作動液の流路５と連通する連通部３２２を有している。連通部３２２は、可動コア３２の縦軸方向に沿って延在する外周面に形成された溝であって、作動液の流路５側から固定コア２２側へと作動液を導いている。 (Movable core)
The movable core 32 has a substantially cylindrical shape made of a magnetic material, and is disposed opposite to the fixed core 22. In the movable core 32, a concave portion 321 having a circular cross section is formed in one end portion facing the fixed core 22, and the spherical valve body 30 is press-fitted in the other tapered end portion facing the valve seat body 40. ing. In the recess 321, the spring member 34 is disposed in the recess 321 so as to be contracted between the fixed core 22 and the movable core 32. The movable core 32 has a communication portion 322 that communicates with the flow path 5 of the hydraulic fluid. The communication part 322 is a groove formed on the outer peripheral surface extending along the longitudinal axis direction of the movable core 32, and guides the hydraulic fluid from the hydraulic fluid flow path 5 side to the fixed core 22 side.

（弁体）
弁体３０は、球状であって、弁座体４０の小径開口部に形成された漏斗状の弁座４２に当接して閉弁する。コイル２４が励磁しない消磁状態において、固定コア２２と、可動コア３２とをばね部材３４を圧縮させて所定のばね力を発生させた状態で挟んで組付されている。 (Valve)
The valve body 30 is spherical and closes by contacting a funnel-shaped valve seat 42 formed in the small-diameter opening of the valve seat body 40. In the demagnetized state where the coil 24 is not excited, the fixed core 22 and the movable core 32 are sandwiched and assembled while the spring member 34 is compressed to generate a predetermined spring force.

（固定コア）
固定コア２２は、磁性材料からなる略円柱形状であって、非磁性材料であるボディ２０から突出して配置されている。ボディ２０から突出した固定コア２２の外周面に対して、ヨーク２４ａと磁気的に結合することができるため、磁気損失が少ない。固定コア２２の可動コア３２側の一方の端部には、ばね部材３４の一端が当接している。したがって、ばね部材３４は、その一端を可動コア３２の凹部３２１内に当接させ、その他端を固定コア２２の一方の端部に当接させている。 (Fixed core)
The fixed core 22 has a substantially cylindrical shape made of a magnetic material, and is disposed so as to protrude from the body 20 which is a nonmagnetic material. Since the outer peripheral surface of the fixed core 22 protruding from the body 20 can be magnetically coupled to the yoke 24a, the magnetic loss is small. One end of the spring member 34 is in contact with one end of the fixed core 22 on the movable core 32 side. Therefore, one end of the spring member 34 is brought into contact with the recess 321 of the movable core 32, and the other end is brought into contact with one end portion of the fixed core 22.

固定コア２２には、参考例３における収容部材８１が本実施の形態の固定コア２２に対応していると考えた場合、参考例３と同様の構成を有する液圧検出手段７０が設けられている。 The stationary core 22, if the housing member 81 in Example 3 is considered to correspond to the fixed core 22 of the present embodiment, the liquid pressure detecting means 70 is provided having the same configuration as in Reference Example 3 Yes.

固定コア２２は、作動液の流路５と連通部３２２を介して連通する収容孔２８６を有する円筒状の第１の固定コア部材２８２と、可動コア３２とは反対側の収容孔２８６の開口を閉塞する第２の固定コア部材２８４と、を有する。 The fixed core 22 includes a cylindrical first fixed core member 282 having an accommodation hole 286 that communicates with the hydraulic fluid flow path 5 through the communication portion 322, and an opening of the accommodation hole 286 on the opposite side of the movable core 32. And a second fixed core member 284 for closing.

磁歪素子７２は、円柱状であって、一方の端面が第２の固定コア部材２８４に接触して移動が規制され、可動コア３２側の他方の端面が作動液の液圧及び弾性部材７７の付勢力を受ける。また、収容孔８６の内周面には、液圧による磁歪素子７２の縦軸方向の圧縮変形による周方向への膨張変形を許容する溝が形成されている。収容孔２８６の内周面の溝は磁歪素子７２のほぼ縦軸方向の全長に渡って形成され、収容孔８６の内周面は磁歪素子７２の両端部外周面とのみ接触している。 The magnetostrictive element 72 has a cylindrical shape, one end surface of which is in contact with the second fixed core member 284 and movement is restricted, and the other end surface on the movable core 32 side is the hydraulic pressure of the hydraulic fluid and the elastic member 77. Receive a biasing force. In addition, a groove that allows expansion deformation in the circumferential direction due to compressive deformation in the longitudinal direction of the magnetostrictive element 72 due to hydraulic pressure is formed on the inner peripheral surface of the accommodation hole 86. The groove on the inner peripheral surface of the accommodating hole 286 is formed over the entire length of the magnetostrictive element 72 in the longitudinal direction, and the inner peripheral surface of the accommodating hole 86 is in contact only with the outer peripheral surfaces at both ends of the magnetostrictive element 72.

第１の固定コア部材２８２の一端は、ボディ２０に溶接固定されている。収容孔２８６は、略円柱状の磁歪素子７２の収容されている部分の内径よりも可動コア３２側の内径が細く形成された段付き形状であって、これら内径が変化する段差部に弾性部材７７が配置されている。 One end of the first fixed core member 282 is fixed to the body 20 by welding. The accommodating hole 286 has a stepped shape in which the inner diameter on the movable core 32 side is narrower than the inner diameter of the portion in which the substantially cylindrical magnetostrictive element 72 is accommodated, and an elastic member is provided at the step portion where the inner diameter changes. 77 is arranged.

コイル２４は、ハウジング４の端面から突出したボディ２０及びボディ２０から突出した第１の固定コア部材２８２の端部の周囲に配置されている。また、コイル２４から延在する接続端子２５は、電子制御部Ｂの回路と電気的に接続されている。 The coil 24 is disposed around the body 20 protruding from the end face of the housing 4 and the end of the first fixed core member 282 protruding from the body 20. The connection terminal 25 extending from the coil 24 is electrically connected to the circuit of the electronic control unit B.

したがって、参考例３に係る液圧検出手段７０同様、流路５の液圧が上昇すると、液圧によって磁歪素子７２が第２の固定コア部材２８４側へ押されて圧縮歪みが発生する。この圧縮歪みは、インダクタンスの変化として表れ、コイル２４の出力電圧値が変化することになる。 Therefore, like the hydraulic pressure detection means 70 according to Reference Example 3, when the hydraulic pressure in the flow path 5 rises, the magnetostrictive element 72 is pushed toward the second fixed core member 284 by the hydraulic pressure, and compressive strain is generated. This compressive strain appears as a change in inductance, and the output voltage value of the coil 24 changes.

このように、液圧検出手段７０を電磁弁１０と共に車両用ブレーキ液圧制御装置１に組み付けることができるので、配置スペースが省けるため、車両用ブレーキ液圧制御装置１におけるレイアウトの自由度が向上する。 Thus, since the hydraulic pressure detecting means 70 can be assembled to the vehicle brake hydraulic pressure control device 1 together with the electromagnetic valve 10, the layout space in the vehicle brake hydraulic pressure control device 1 is improved because the arrangement space can be saved. To do.

このように、電磁弁１０の固定コア２２における液圧を計測することで、各車輪ブレーキの液圧状態を確認することができる。したがって、車両用ブレーキ液圧制御装置１を精度よく制御することができる。 Thus, the hydraulic pressure state of each wheel brake can be confirmed by measuring the hydraulic pressure in the fixed core 22 of the electromagnetic valve 10. Therefore, the vehicle brake hydraulic pressure control device 1 can be controlled with high accuracy.

また、固定コアの変形を液圧の計測に用いることで、作動液回路上に別途圧力センサを配置する必要がなく、コンパクトな車両用ブレーキ液圧制御装置とすることができる。 Further, by using the deformation of the fixed core for measuring the hydraulic pressure, it is not necessary to separately provide a pressure sensor on the hydraulic fluid circuit, and a compact vehicle brake hydraulic pressure control device can be obtained.

さらに、既存の電磁弁のコイルを用いることで、別途検出コイルを配置する必要がなく、組付工数や部品点数を削減することができる。 Furthermore, by using the coil of the existing solenoid valve, it is not necessary to separately arrange a detection coil, and the number of assembling steps and the number of parts can be reduced.

このように磁歪素子７２を用いることで、制御側との電気的な接続はコイル２４だけとなり、簡単な構造で、電磁弁１０のレイアウト性を低下させることなく電磁弁１０における液圧を計測することができる。また、磁歪素子７２とコイル２４は、電気的及び機械的に非接触で構成することができるため、電気的及び機械的なノイズが双方に伝達しにくい。 By using the magnetostrictive element 72 in this way, electrical connection to the control side is limited to the coil 24, and the hydraulic pressure in the solenoid valve 10 is measured with a simple structure without degrading the layout of the solenoid valve 10. be able to. Further, since the magnetostrictive element 72 and the coil 24 can be configured to be electrically and mechanically non-contact, it is difficult for electrical and mechanical noise to be transmitted to both.

しかしながら、一実施の形態においては、参考例１〜５とは異なり、コイル２４は可動コア３２駆動用のコイルとしても作用する。つまり、図１２に示すように、コイル２４は、電子制御部ＢのコントローラＢ１の指示に基づいて、電流供給回路Ｂ２から可動コア３２を駆動するための駆動電流例えば、直流もしくは周波数ｆ１の交流電流が供給されるとともに、駆動電流に重畳して周波数ｆ２の交流電流が供給される。この交流電流は、可動コア３２駆動用のコイル２４を検出コイルとして機能させるためのインダクタンス変化検出用の交流電流である。そして、可動コア３２駆動用のコイル２４の出力信号からは、交流信号分離検出回路Ｂ３を用いて交流信号が分離検出され、検出された交流信号からインダクタンスの変化として液圧検出回路Ｂ４によって液圧が計測される。駆動電流が周波数ｆ１の交流電流である場合、インダクタンス変化検出用の交流電流の周波数ｆ２は、周波数ｆ１とはかけ離れた周波数が選択され、両者を分離しやすく設定されている。 However, in one embodiment, unlike the reference examples 1 to 5 , the coil 24 also functions as a coil for driving the movable core 32. That is, as shown in FIG. 12, the coil 24 is configured to drive the driving core 32 for driving the movable core 32 from the current supply circuit B2 based on an instruction from the controller B1 of the electronic control unit B. Is supplied, and an alternating current of frequency f2 is supplied superimposed on the drive current. This alternating current is an alternating current for detecting an inductance change for causing the coil 24 for driving the movable core 32 to function as a detection coil. Then, an AC signal is separated and detected from the output signal of the coil 24 for driving the movable core 32 using the AC signal separation detection circuit B3, and the hydraulic pressure is detected by the hydraulic pressure detection circuit B4 as a change in inductance from the detected AC signal. Is measured. When the drive current is an alternating current of frequency f1, the frequency f2 of the alternating current for detecting the inductance change is selected as a frequency far from the frequency f1, and is set to easily separate the two.

一実施の形態における液圧を検出する方法について、図１０（常閉型の電磁弁が非作動時）及び図１１（常閉型の電磁弁が作動時）を用いて説明する。図１０及び図１１のグラフＭ、Ｓはコイル２４への入力電流特性を示し、グラフＮ、Ｔは液圧の変化を示し、グラフＯ、Ｕはコイル２４におけるインダクタンスの変化を示し、グラフＰ及びＶはコイル２４から出力される電圧特性を示し、グラフＱ及びＷはグラフＰ及びＶの電圧特性を整流化したものであり、グラフＲ、Ｘは液圧検出手段７０によって計測された圧力変化を示す。なお、図１０におけるグラフＭ〜Ｒ及びＳ〜Ｗの横軸は時間経過を示す。 A method of detecting the hydraulic pressure in one embodiment will be described with reference to FIG. 10 (when the normally closed solenoid valve is not in operation) and FIG. 11 (when the normally closed solenoid valve is in operation). Graphs M and S in FIGS. 10 and 11 show characteristics of input current to the coil 24, graphs N and T show changes in hydraulic pressure, graphs O and U show changes in inductance in the coil 24, and graphs P and V indicates a voltage characteristic output from the coil 24, graphs Q and W are rectified voltage characteristics of the graphs P and V, and graphs R and X indicate pressure changes measured by the hydraulic pressure detection means 70. Show. Note that the horizontal axes of the graphs M to R and SW in FIG. 10 indicate the passage of time.

（常閉型の電磁弁の非作動時）
図１０のグラフＭに示すように、電子制御部Ｂの電流供給回路Ｂ２からコイル２４へインダクタンス変化検出用の一定振幅の交流電流が入力されている。この交流電流の最大電流値Ｉmaxは、電磁弁１０における可動コア３２が動作しない程度に設定されている。グラフＮに示すように流路５の液圧を変化させたとき、連通部３２２を介して収容孔２８６内の液圧も変化し、磁歪素子７２は歪み、グラフＯに示すようなインダクタンスの変化が起こる。このようなインダクタンスの変化は、電子制御部Ｂ内の交流信号分離検出回路Ｂ３（例えばＢＰＦ：バンドパスフィルタ）によって入力電圧と分離され、グラフＰに示すようなコイル２４の両端における電圧の変化となって現れる。電子制御部Ｂの液圧検出回路Ｂ４は、このグラフＰの電圧波形を整流化してグラフＱを得て、さらに、これを平滑化すると共に圧力に換算することでグラフＲに示すような流路５における液圧の変化を計測することができる。そして、計測された液圧に基づいて電子制御部Ｂは、電磁弁１０などを制御する。 (When the normally closed solenoid valve is not operating)
As shown in a graph M in FIG. 10, a constant amplitude alternating current for detecting an inductance change is input from the current supply circuit B <b> 2 of the electronic control unit B to the coil 24. The maximum current value Imax of this alternating current is set to such an extent that the movable core 32 in the solenoid valve 10 does not operate. When the hydraulic pressure in the flow path 5 is changed as shown in the graph N, the hydraulic pressure in the accommodation hole 286 also changes through the communication portion 322, the magnetostrictive element 72 is distorted, and the inductance changes as shown in the graph O. Happens. Such a change in inductance is separated from an input voltage by an AC signal separation detection circuit B3 (for example, BPF: bandpass filter) in the electronic control unit B, and a change in voltage at both ends of the coil 24 as shown in the graph P. It appears. The fluid pressure detection circuit B4 of the electronic control unit B obtains a graph Q by rectifying the voltage waveform of the graph P, and further smoothes the voltage waveform and converts it into a pressure as shown in the graph R. The change in hydraulic pressure at 5 can be measured. Based on the measured hydraulic pressure, the electronic control unit B controls the electromagnetic valve 10 and the like.

（常閉型の電磁弁の作動時）
まず、電子制御部Ｂの電流供給回路Ｂ２から接続端子２５を介してコイル２４へ可動コア３２を駆動するための直流駆動電流を供給するとともに、この直流駆動電流に重畳して可動コア３２駆動用のコイル２４を検出コイルとして機能させるためのインダクタンス変化検出用の交流電流を供給する。 (When operating normally closed solenoid valve)
First, a DC drive current for driving the movable core 32 is supplied from the current supply circuit B2 of the electronic control unit B to the coil 24 via the connection terminal 25, and is superimposed on the DC drive current to drive the movable core 32. An alternating current for detecting an inductance change is supplied to cause the coil 24 to function as a detection coil.

図１１のグラフＳに示すように、コイル２４にはインダクタンス変化検出用の一定振幅の交流電流が入力されている。この交流電流の最小電流値Ｉminは、電磁弁１０における可動コア３２が作動（開弁状態）を維持する程度に設定されている。そして、グラフＴに示すように流路５の液圧を変化させたとき、連通部３２２を介して収容孔２８６内の液圧も変化し、磁歪素子７２は歪み、インダクタンスの変化が起こる。このようなインダクタンスの変化は、コイル２４の両端間における電圧の変化となって現れるが、このままでは圧力に換算できない。 As shown in the graph S of FIG. 11, a constant amplitude alternating current for detecting an inductance change is input to the coil 24. The minimum current value Imin of this alternating current is set to such an extent that the movable core 32 in the electromagnetic valve 10 is maintained in operation (opened state). Then, as shown in the graph T, when the fluid pressure in the flow path 5 is changed, the fluid pressure in the accommodation hole 286 is also changed through the communication portion 322, so that the magnetostrictive element 72 is distorted and an inductance change occurs. Such a change in inductance appears as a change in voltage between both ends of the coil 24, but cannot be converted into pressure as it is.

そこで、車両用ブレーキ液圧制御装置１に設けられた可動コア３２駆動用のコイル２４の出力信号（この場合はコイル２４の電圧値）から交流信号分離検出回路Ｂ３（例えばＢＰＦ：バンドパスフィルタ）を用いて、入力電圧と分離したグラフＶの交流信号（電圧波形）のみを得る。検出された交流信号からインダクタンスの変化として液圧検出回路Ｂ４を用いて、このグラフＶの交流信号（電圧波形）を整流化して、グラフＷを得て、これを平滑化すると共に圧力に換算することでグラフＸに示すような流路５における液圧の変化を計測することができる。 Therefore, an AC signal separation detection circuit B3 (for example, BPF: band-pass filter) from an output signal (in this case, the voltage value of the coil 24) of the coil 24 for driving the movable core 32 provided in the vehicle brake hydraulic pressure control device 1 is used. Is used to obtain only the AC signal (voltage waveform) of the graph V separated from the input voltage. The AC signal (voltage waveform) of this graph V is rectified using the hydraulic pressure detection circuit B4 as a change in inductance from the detected AC signal to obtain a graph W, which is smoothed and converted to pressure. Thus, the change in the hydraulic pressure in the flow path 5 as shown in the graph X can be measured.

このようにして計測された液圧に基づいて電子制御部Ｂは、電磁弁１０を制御して流路５内の流れを制御することができる。なお、交流信号分離検出回路Ｂ３と液圧検回路Ｂ４は、いずれも電子制御部Ｂの基板８の回路に設けられている。 Based on the fluid pressure thus measured, the electronic control unit B can control the flow in the flow path 5 by controlling the electromagnetic valve 10. Note that both the AC signal separation detection circuit B3 and the hydraulic pressure detection circuit B4 are provided in the circuit of the substrate 8 of the electronic control unit B.

このような構成とすることで、電磁弁の作動中であっても、コイルの出力信号から液圧を検出することができる。 With such a configuration, the hydraulic pressure can be detected from the output signal of the coil even during operation of the electromagnetic valve.

なお、本発明は、本実施の形態に限定されるものではなく、本発明の要旨の範囲内において種々の形態に変形可能である。 In addition, this invention is not limited to this Embodiment, It can deform | transform into various forms within the range of the summary of this invention.

例えば、本実施の形態では検出コイル７３に振幅一定の交流電流を入力させたが、振幅一定の交流電圧を入力側に用いて、出力された電流値の変化によって圧力換算することで、液圧変化を計測することも可能である。 For example, in the present embodiment, an alternating current having a constant amplitude is input to the detection coil 73. However, by using an alternating voltage having a constant amplitude on the input side and converting the pressure according to a change in the output current value, a hydraulic pressure is obtained. It is also possible to measure changes.

なお、参考例１〜５に係る液圧検出手段とハウジングとの固定は、係止部材７を用いたが、これに限らず一実施の形態に係る電磁弁のようなカシメ固定を採用することも可能である。 In addition, although the locking member 7 was used to fix the hydraulic pressure detecting means and the housing according to Reference Examples 1 to 5 , the invention is not limited to this, and caulking fixing such as an electromagnetic valve according to one embodiment should be adopted. Is also possible.

車両用ブレーキ液圧制御装置の側面図である。It is a side view of the brake fluid pressure control device for vehicles. 参考例１に係る車両用ブレーキ制御装置の液圧検出手段の縦断面図である。It is a longitudinal cross-sectional view of the hydraulic pressure detection means of the vehicle brake control apparatus according to Reference Example 1 . 参考例２に係る車両用ブレーキ制御装置の液圧検出手段の縦断面図である。It is a longitudinal cross-sectional view of the hydraulic pressure detection means of the vehicle brake control apparatus according to Reference Example 2 . 参考例３に係る車両用ブレーキ制御装置の液圧検出手段の縦断面図である。It is a longitudinal cross-sectional view of the hydraulic pressure detection means of the vehicle brake control apparatus according to Reference Example 3 . 参考例４に係る車両用ブレーキ制御装置の液圧検出手段の縦断面図である。It is a longitudinal cross-sectional view of the hydraulic-pressure detection means of the vehicle brake control apparatus which concerns on the reference example 4 . 参考例５に係る車両用ブレーキ制御装置の液圧検出手段の縦断面図である。It is a longitudinal cross-sectional view of the hydraulic-pressure detection means of the vehicle brake control apparatus which concerns on the reference example 5 . 液圧の検出を説明する各種波形図である。It is various waveform diagrams explaining the detection of hydraulic pressure. 液圧の検出を説明する各種波形図である。It is various waveform diagrams explaining the detection of hydraulic pressure. 本発明の一実施の形態に係る車両用ブレーキ制御装置の常閉型の電磁弁の縦断面図である。 1 is a longitudinal sectional view of a normally closed solenoid valve of a vehicle brake control device according to an embodiment of the present invention. 液圧の検出を説明する各種波形図である。It is various waveform diagrams explaining the detection of hydraulic pressure. 液圧の検出を説明する各種波形図である。It is various waveform diagrams explaining the detection of hydraulic pressure. 電子制御部を説明するブロック図である。It is a block diagram explaining an electronic control part.

Explanation of symbols

１車両用ブレーキ液圧制御装置
２電動モータ
３カバー
５作動液の流路
６装着孔
７係止部材
８基板
９シール部材
１０常閉型の電磁弁
２０ボディ
２２固定コア
２４コイル
２５接続端子
２６ボビン
３０弁体
３２可動コア
３４ばね部材
４０弁座体
４２弁座
５１流出口
５２流入口
７０液圧検出手段
７２磁歪素子
７３検出コイル
７４接続端子
７６カバー部材
７７弾性部材
７８圧力伝達部材
８１収容部材
８２収容筒部材
８４収容蓋部材
８６収容孔
８８第１の磁石
８９第２の磁石
９１、９２シール部材
２８２第１の固定コア部材
２８４第２の固定コア部材
２８６収容孔
３２１凹部
３２２連通部
７２０筒状部
７２１取付部
７２２有底受圧孔
７２３底部
７８１押圧部
７８２受圧部
Ａ液圧制御部
Ｂ電子制御部
Ｂ１コントローラ
Ｂ２電流供給回路
Ｂ３交流信号分離検出回路
Ｂ４液圧検出回路 DESCRIPTION OF SYMBOLS 1 Vehicle brake hydraulic pressure control apparatus 2 Electric motor 3 Cover 5 Hydraulic fluid flow path 6 Mounting hole 7 Locking member 8 Substrate 9 Seal member 10 Normally closed solenoid valve 20 Body 22 Fixed core 24 Coil 25 Connection terminal 26 Bobbin 30 valve body 32 movable core 34 spring member 40 valve seat body 42 valve seat 51 outflow port 52 inflow port 70 hydraulic pressure detecting means 72 magnetostrictive element 73 detection coil 74 connection terminal 76 cover member 77 elastic member 78 pressure transmission member 81 accommodating member 82 Housing tube member 84 Housing lid member 86 Housing hole 88 First magnet 89 Second magnet 91, 92 Seal member 282 First fixed core member 284 Second fixed core member 286 Housing hole 321 Recess 322 Communication portion 720 Tubular shape Portion 721 Mounting portion 722 Bottomed pressure receiving hole 723 Bottom 781 Pressing portion 782 Pressure receiving portion A Fluid pressure control portion B Electronic control portion B1 Controller B2 Current supply circuit B3 AC signal separation detection circuit B4 Hydraulic pressure detection circuit

Claims

Brake fluid for a vehicle having hydraulic pressure detecting means for detecting hydraulic pressure of hydraulic fluid for braking in the flow path, and an electronic control unit for controlling an electromagnetic valve provided in the flow path based on the detected hydraulic pressure In the pressure control device,
The solenoid valve includes a normally closed solenoid valve,
The normally closed solenoid valve has a fixed core, a movable core, and a coil for driving the movable core,
The liquid pressure detection means comprises a magnetostrictive element provided in the fixed core as before Symbol hydraulic fluid acts directly or indirectly,
The coil for driving the movable core is arranged in a non-contact state with the hydraulic fluid around the magnetostrictive element, and also serves as a detection coil for detecting the strain of the magnetostrictive element as a change in inductance ,
Inductance change detection for supplying a driving current for driving the movable core to the movable core driving coil and for causing the movable core driving coil to function as the detection coil while being superimposed on the driving current. Current supply means for supplying an alternating current for use;
Means for separating and detecting an AC signal from an output signal of the movable core driving coil;
Means for measuring the hydraulic pressure as a change in the inductance from the detected AC signal,
When the normally closed solenoid valve is not in operation, the maximum current value of the alternating current input from the current supply means to the movable core driving coil is set to be equal to or less than the current value that does not drive the movable core,
During the operation of the normally closed solenoid valve, the minimum current value of the alternating current input from the current supply means to the coil for driving the movable core is set to be equal to or higher than the current value for maintaining the operation of the movable core,
The electronic control unit is a vehicle brake hydraulic pressure control device that controls an electromagnetic valve based on the measured hydraulic pressure.

In claim 1,
The vehicular brake hydraulic pressure control device, wherein the magnetostrictive element is disposed at a position where the hydraulic pressure of the hydraulic fluid directly acts, and a coating is applied to a surface thereof so that the hydraulic fluid does not directly contact.

In claim 1,
The fluid pressure detecting means is
A brake fluid pressure control device for a vehicle having a pressure transmission member for indirectly transmitting the hydraulic pressure of the hydraulic fluid to the magnetostrictive element.

In claim 2,
The magnetostrictive element is formed as a part or all of a cylindrical portion having a bottomed pressure receiving hole communicating with the flow path,
The detection coil is a vehicle brake hydraulic pressure control device disposed around the cylindrical portion.

In claim 3,
The magnetostrictive element is formed as a part or all of a cylindrical portion having a bottomed pressure receiving hole communicating with the flow path,
The detection coil is disposed around the cylindrical portion,
The pressure transmission member includes a pressing portion that contacts a bottom portion of the bottomed pressure receiving hole, and a pressure receiving portion that receives the fluid pressure,
A vehicle brake hydraulic pressure control device that transmits the hydraulic pressure received by the pressure receiving portion to the magnetostrictive element via the pressing portion.

In any one of Claims 1-5,
The fluid pressure detecting means is
The vehicle brake hydraulic pressure control device further includes means for generating a bias magnetic field for the magnetostrictive element in a direction of a magnetic field generated by the detection coil.

In a normally closed solenoid valve for controlling hydraulic fluid,
Comprising a stationary core, a movable core, and a coil for driving the movable core, a magnetostrictive element that is disposed on the fixed core so that the liquid pressure of the hydraulic fluid acts directly or indirectly,
Said coil for said movable core drive disposed around the fixed core, also serves as a strain of the magnetostrictive element as a detection coil for detecting a change in inductance,
The movable core driving coil is supplied with a driving current for driving the movable core from the current supply means, and is superposed on the driving current so that the movable core driving coil functions as the detection coil. AC current for detecting change in inductance is supplied,
From the output signal of the coil for driving the movable core, the AC signal is separated and detected using a means for separating and detecting the AC signal,
A process of measuring the hydraulic pressure as a change in the inductance from the detected AC signal is performed,
When the normally closed solenoid valve is not in operation, the maximum current value of the alternating current input from the current supply means to the movable core driving coil is set to be equal to or less than the current value that does not drive the movable core,
When the normally closed solenoid valve is in operation, the minimum current value of the alternating current input from the current supply means to the coil for driving the movable core is set to be equal to or higher than the current value for maintaining the operation of the movable core. Type solenoid valve.