JP2002031023A - Pressure detecting device, pressure detecting method, and recording medium - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To reliably and accurately detect the atmospheric pressure when starting an engine. SOLUTION: When a starter motor 24 is driven by a starter switch 27, a pressure sensor 22 detects a pressure in an intake manifold 20, and an ECU (engine control device) 10 until the detection of the atmospheric pressure by the pressure sensor 22 is completed. Accordingly, the drive of the starter motor 24 by the starter switch 27 is regulated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure detecting device, a pressure detecting method, and a recording medium which regulate the driving of a starter motor until the detection of the atmospheric pressure is completed at the time of engine start.

[0002]

2. Description of the Related Art The operating characteristics of an engine are electronically controlled on the basis of parameters such as the engine speed, intake manifold pressure, throttle opening, and atmospheric pressure. Further, the intake manifold pressure in the intake passage downstream of the throttle valve that limits the amount of intake air to the engine in conjunction with the accelerator is detected as an absolute pressure by a manifold pressure sensor. The atmospheric pressure is detected by an atmospheric pressure sensor provided separately from the manifold pressure sensor.

In recent years, in order to reduce costs, one pressure sensor has been used to detect the intake manifold pressure and the atmospheric pressure. This is based on the fact that the intake manifold pressure before the start of the engine is substantially equal to the atmospheric pressure, and the pressure before the engine is started is set to the atmospheric pressure, and the pressure after the engine is started is set to the intake manifold pressure. It is.

[0004] As an example in which the intake manifold pressure and the atmospheric pressure are detected by such a single pressure sensor, for example, in Japanese Patent Application Laid-Open No. Hei 1-208551, a predetermined period from the key switch ON to the cell switch ON is described. At (0.0 seconds), the intake manifold pressure is stored as the atmospheric pressure when the change in the intake manifold pressure is equal to or less than a predetermined value.

[0005]

However, as in the prior art described above, the key switch is turned on and the cell switch is turned on.
In the method of detecting the atmospheric pressure during a predetermined period (0.0 seconds) up to N, the detection period of the atmospheric pressure is extremely short, so that an inaccurate atmospheric pressure is detected, or in the worst case, the atmospheric pressure is detected. It is expected that it may not be detected.

The present invention has been made in view of such circumstances, and provides a pressure detecting device, a pressure detecting method, and a recording medium that can reliably and accurately detect the atmospheric pressure at the time of starting the engine. Is what you can do.

[0007]

According to a first aspect of the present invention, there is provided a pressure detecting device for detecting an atmospheric pressure and an intake manifold pressure by a single pressure sensor. Even if the starter switch means for driving the starter motor is turned on, a regulation means for regulating the drive of the starter motor is provided until the detection of the atmospheric pressure by the pressure sensor is completed. Further, the regulating means includes a pressure input circuit for taking in the atmospheric pressure detected by the pressure sensor as a detection value, storing the detected value of the taken-in atmospheric pressure, and a starter motor when the detection of the atmospheric pressure is completed. And a driver for turning on a transistor for driving a starter relay of a starter motor according to the control signal. Also,
The CPU includes an atmospheric pressure detection completion determining unit that determines whether the detection of the atmospheric pressure is completed. When the atmospheric pressure detection completion determining unit determines that the detection of the atmospheric pressure is completed, the CPU outputs a control signal. You can make it. The pressure detection method according to claim 4 is a pressure detection method for detecting atmospheric pressure and intake manifold pressure by one pressure sensor, wherein a starter switch means for driving a starter motor for starting an engine is provided. When turned on,
Until the detection of the atmospheric pressure by the pressure sensor is completed, a first step of regulating the driving of the starter motor by the regulating means is provided. The first step includes turning on the starter switch means for driving the starter motor, and restricting the starter motor drive by the starter switch means until the detection of the atmospheric pressure by the pressure sensor is completed. And a fourth step of releasing the starter motor drive restriction after the detection of the atmospheric pressure is completed. In the third and fourth steps, a fifth step of taking in the atmospheric pressure detected by the pressure sensor as a detection value by the pressure input circuit, and storing the detected atmospheric pressure value by the CPU. In addition, when the detection of the atmospheric pressure is completed, the sixth step of outputting a control signal for permitting the driving of the starter motor, and when the driver receives the control signal, sets a transistor for driving the starter relay of the starter motor. And a seventh step of turning on. The sixth and seventh steps include an eighth step of determining whether or not the detection of the atmospheric pressure has been completed by the atmospheric pressure detection completion determination unit, and a detection of the atmospheric pressure by the atmospheric pressure detection completion determination unit. Is completed, a ninth step of outputting a control signal can be included.
A recording medium according to an eighth aspect is characterized by recording a program capable of executing the pressure detecting method according to any one of the fifth to seventh aspects. In the pressure detection device, the pressure detection method, and the recording medium according to the present invention, when the starter motor is driven by the starter switch, the pressure sensor detects the pressure in the intake manifold, and the detection of the atmospheric pressure by the pressure sensor is completed. Until,
The restricting means restricts the driving of the starter motor by the starter switch means.

[0008]

Embodiments of the present invention will be described below.

FIG. 1 is a circuit block diagram showing an embodiment in which the pressure detecting device of the present invention is applied to a motorcycle. FIG. 2 is a block diagram showing details of a CPU of an ECU (engine control device) in FIG. FIGS. 3 and 4 are flowcharts for explaining a pressure detecting method in the pressure detecting device of FIG. 1, and FIG. 4 is a time chart for explaining a pressure detecting method in the pressure detecting device of FIG.

The pressure detecting device shown in FIG. 1 includes a pressure input circuit 11, a transistor (Tr) 12, a driver 13,
An ECU (engine control device) 10 is provided as a regulating means having a PU 14.

The pressure input circuit 11 includes a throttle valve 2
The detection result from the pressure sensor 22 for detecting the pressure in the intake manifold 20 having the pressure of 1
Give to U14.

The transistor (Tr) 12 includes a CPU 14
It is turned on / off by a driver 13 operated by a control signal from the controller 13. Here, the control signal from the CPU 14 is for permitting driving of a starter motor 24 described later.

The CPU 14 determines the operating characteristics of the engine, for example, the engine speed, the intake manifold pressure,
The electronic control is performed based on parameters such as the throttle opening and the atmospheric pressure. Also, as shown in FIG. 2, for example, as shown in FIG. 2, the CPU 14 sends a control signal to the driver 13 when determining that the detection of the atmospheric pressure, which is the detected value, has been completed. And an atmospheric pressure detection completion determining unit 14b for outputting. In FIG. 2, the configuration of the intake manifold pressure detection circuit after the engine is started is omitted for convenience of explanation.

In FIG. 1, a transistor (T
A starter relay 25 for driving a starter motor 24 via a side stand switch 23 is connected to, for example, the collector side of r) 12.

A battery 26 is connected to the contact side of the starter relay 25. A starter switch 27 and front and rear brake switches 28 are connected to the coil side of the starter relay 25. Here, the starter switch 27 constitutes starter switch means.

A stop lamp 29 and a tail lamp 30 are connected to both ends of the front and rear brake switches 28, respectively.

An IG (ignition) switch 31 and a kill switch 32 are connected to the battery 26. The ECU (engine control unit) 1 is connected to the battery 26 via the IG (ignition) switch 31 and the kill switch 32.
0 drive power is supplied.

The battery 26 has a regulated rectifier 34 for adjusting the voltage of the generator 33.
Is connected. A pickup 35 is arranged close to the generator 33. Pickup 35 is EC
The engine is connected to a U (engine control device) 10 so that the engine speed and the crank timing are detected.

Next, a pressure detecting method in the pressure detecting device having such a configuration will be described.

First, as shown in FIG. 3, before turning on a starter switch 27 for starting the engine, the IG
(Ignition) switch 31 and kill switch 32
Is turned on (step 301). As a result, as shown in FIG. 4, the drive power from the battery 26 is supplied to the ECU (engine control device) 10.
(Engine Control Unit) The CPU 14 of the R
The engine control program stored in the OM is read (step 302).

When starting the engine, both the side stand switch 23 and the front and rear brake switches 28 are turned on for safety.

At this time, the ECU (engine control device) 1
The CPU 14 of 0 turns off the output of the driver 13. Thus, as shown in FIG. 4, the starter relay 25 is regulated by the starter prohibition period so that the starter relay 25 is not driven even when the starter switch 27 is turned on (step 303).

In this state, as shown in FIG. 4, an atmospheric pressure input period is provided within a starter prohibition period in which the starter motor 24 is not driven even if the starter switch 27 is erroneously turned on. The detection of the atmospheric pressure is performed without pulsation (step 304).

The detection result of the atmospheric pressure detected by the pressure sensor 22 is stored as a detection value by the pressure input circuit 11 in the memory 14a in the CPU 14 of FIG. 2 (step 305). At this time, when the atmospheric pressure detection completion determining unit 14b in the CPU 14 determines that the detection of the atmospheric pressure is completed (step 306), a control signal is given from the atmospheric pressure detection completion determining unit 14b to the driver 13 (step 306). 307), the transistor (Tr) 12 is turned on under the control of the driver 13.

At this time, if the starter switch 27 is turned on (step 308), the starter motor 24 is driven by the starter relay 25 as shown in FIG. 4, and the engine is started (step 309).

By the way, when the engine is started, FIG.
As shown in FIG. 7, intake pulsation occurs due to engine cranking in which the atmospheric pressure cannot be detected.

As described above, in this embodiment, when the starter motor 24 is driven by the starter switch 27, the intake manifold 2 is detected by the pressure sensor 22.
The starter motor 24 is controlled by the starter switch 27 by the ECU (engine control device) 10 until the pressure in the pressure sensor 0 is detected and the detection of the atmospheric pressure by the pressure sensor 22 is completed.
, The detection of the atmospheric pressure at the time of starting the engine can be performed reliably and accurately.

In this embodiment, the case where the pressure detecting device of the present invention is applied to a two-wheeled vehicle has been described. However, as shown in FIG. 5, it can be applied to a four-wheeled vehicle.

In this case, in terms of circuit, for example, the side stand switch 23, starter switch 27, kill switch 32 and the like in FIG. 1 are omitted, and the starter switch section 27a is turned on in conjunction with the IG (ignition) switch 31. Configuration. Here, the starter switch section 27a constitutes starter switch means.

In this case, even if the IG (ignition) switch 31 is turned on, the atmospheric pressure input period is provided within the starter prohibition period in which the starter motor 24 is not driven, as described with reference to FIGS. Sensor 22
, The detection of the atmospheric pressure can be reliably and accurately performed without pulsation.

[0031]

As described above, the pressure detecting device according to the present invention,
According to the pressure detection method and the recording medium, when the starter motor is driven by the starter switch means, the pressure sensor detects the pressure in the intake manifold,
Until the detection of the atmospheric pressure by the pressure sensor is completed, the driving of the starter motor by the starter switch means is restricted by the restricting means. Therefore, the detection of the atmospheric pressure at the time of starting the engine can be performed reliably and accurately.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram showing an embodiment when a pressure detecting device of the present invention is applied to a motorcycle.

FIG. 2 is a block diagram showing details of a CPU of an ECU (engine control device) in FIG. 1;

FIG. 3 is a flowchart for explaining a pressure detection method in the pressure detection device of FIG. 1;

FIG. 4 is a time chart for explaining a pressure detection method in the pressure detection device of FIG. 1;

FIG. 5 is a circuit block diagram showing another embodiment in which the pressure detecting device of the present invention is applied to a four-wheeled vehicle.

[Explanation of symbols]

 Reference Signs List 10 ECU (engine control device) 11 Pressure input circuit 12 Transistor (Tr) 13 Driver 14 CPU 14a Memory 14b Atmospheric pressure detection completion determination unit 20 Intake manifold 21 Throttle valve 22 Pressure sensor 23 Side stand switch 24 Starter motor 25 Starter relay 26 Battery 27 Starter switch 27a Starter switch 28 Front and rear brake switch 29 Stop lamp 30 Tail lamp 31 IG (ignition) switch 32 Kill switch 33 Generator 34 Regulated rectifier 35 Pickup

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F02D 45/00366 F02D 45/00 366D 376 376B

Claims (8)

[Claims] 1. A pressure detecting device for detecting an atmospheric pressure and an intake manifold pressure by one pressure sensor, wherein starter switch means for driving a starter motor for starting an engine is turned on. A pressure detecting device, comprising: a regulating unit that regulates driving of the starter motor until the detection of the atmospheric pressure by the pressure sensor is completed. 2. The pressure control circuit according to claim 1, wherein the control unit stores a detected value of the atmospheric pressure detected by the pressure sensor as a detection value, and detects the atmospheric pressure detected by the pressure input circuit. When the control is completed, a CPU that outputs a control signal for permitting driving of the starter motor, and a driver that turns on a transistor for driving a starter relay of the starter motor according to the control signal. The pressure detection device according to claim 1. 3. The CPU includes an atmospheric pressure detection completion determining unit that determines whether the detection of the atmospheric pressure is completed, and determines that the detection of the atmospheric pressure is completed by the atmospheric pressure detection completion determining unit. The pressure detection device according to claim 2, wherein the control signal is output when the pressure detection is performed. 4. A pressure detecting method for detecting atmospheric pressure and intake manifold pressure by one pressure sensor, wherein a starter switch means for driving a starter motor for starting an engine is turned on. A pressure detecting method, comprising: a first step of restricting driving of the starter motor by a regulating unit until the detection of the atmospheric pressure by the pressure sensor is completed. 5. The first step includes: turning on a starter switch for driving a starter motor; and turning on the starter switch until the detection of the atmospheric pressure by the pressure sensor is completed. 3. A method according to claim 1, further comprising: a third step of restricting the drive of the starter motor by a restricting means; and a fourth step of releasing the drive restriction of the starter motor after the detection of the atmospheric pressure is completed. Item 6. The pressure detection method according to Item 4. 6. A third step in which the atmospheric pressure detected by the pressure sensor is captured as a detection value by a pressure input circuit in the third and fourth steps; Storing a detected value of the atmospheric pressure and outputting a control signal for permitting driving of the starter motor when the detection of the atmospheric pressure is completed;
6. The method according to claim 5, further comprising the step of: when a driver receives the control signal, turning on a transistor for driving a starter relay of the starter motor. . 7. The sixth and seventh steps include: an eighth step of determining whether or not the detection of the atmospheric pressure has been completed by an atmospheric pressure detection completion determining unit; and determining whether or not the atmospheric pressure detection has been completed. The control unit outputs the control signal when it is determined that the detection of the atmospheric pressure is completed.
7. The pressure detecting method according to claim 6, further comprising the steps of: 8. A recording medium on which a program capable of executing the pressure detection method according to claim 5 is recorded.