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WO2018171990A1 - Procédé pour la détection d'erreurs dans un capteur de pression analogique - Google Patents

Procédé pour la détection d'erreurs dans un capteur de pression analogique Download PDF

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Publication number
WO2018171990A1
WO2018171990A1 PCT/EP2018/053908 EP2018053908W WO2018171990A1 WO 2018171990 A1 WO2018171990 A1 WO 2018171990A1 EP 2018053908 W EP2018053908 W EP 2018053908W WO 2018171990 A1 WO2018171990 A1 WO 2018171990A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure
pressure sensor
sensor
measured
control unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2018/053908
Other languages
German (de)
English (en)
Inventor
Tet Kong Brian Chia
Dmitriy KOGAN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Continental Automotive GmbH
Original Assignee
Continental Automotive GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Continental Automotive GmbH filed Critical Continental Automotive GmbH
Publication of WO2018171990A1 publication Critical patent/WO2018171990A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/3809—Common rail control systems
    • F02D41/3836—Controlling the fuel pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
    • F02D2041/223—Diagnosis of fuel pressure sensors

Definitions

  • the present invention relates to a method for detecting an area-internal error of an analog pressure sensor.
  • Analog pressure sensors are known. They are used for pressure detection in a variety of fields, for example in the automotive industry. For this purpose, in modern common-rail fuel injection systems, the rail pressure is regulated on the basis of feedback signals from a rail pressure sensor.
  • Such a pressure sensor in particular a rail pressure sensor, is a high-pressure analog sensor which is mounted on the fuel rail in the case of a rail pressure sensor.
  • the rail pressure sensor supplies an output signal in the form of a signal voltage V out to the engine control unit (ECU).
  • the high-pressure sensor is supplied with voltage from the engine control unit ECU via a supply voltage V s and earth, which is used to operate the pressure sensor and as a reference voltage for the corresponding transfer function.
  • the signal voltage delivered by the high pressure sensor is based on its transfer function programmed in its ASIC. Based on the received signal voltage V out and the corresponding calibration of the sensor, the rail pressure can be calculated by the ECU. However, the signal voltage measured by the control unit (ECU) may drift. In other words, the measured voltage value may differ from the actual value. In a pressurized system, in the worst case, this can lead to such a signal voltage deviation (Drift) can result in a system overpressure, ie the measured pressure value is less than the actual pressure value, which can ultimately cause a destruction of the system. There are two types of such signal deviation (signal drift). In a first type (signal offset drift), the measured signal voltage has a constant positive or negative drift over the pressure range. In a second type (gain drift), the measured signal voltage has a positive or negative signal deviation (drift), which increases over the pressure range.
  • the measured signal voltage has a negative drift, i. the measured pressure is lower than the actual physical value, there is a risk of overpressure. If the measured signal voltage has a positive drift, i. the measured pressure is higher than the actual physical value, there is a risk of negative pressure. In the first place, such a signal drift is at one
  • Analog sensor due to transmission interference. Since the corresponding information is transmitted by means of an electrical signal voltage, any disturbance of the signal between sensor and receiver can cause such a signal drift.
  • a critical error is an in-band error in which the signal voltage measured by the ECU is still in the voltage range specified by the transfer function of the sensor.
  • an error outside this range can be detected in a simple manner, since the signal voltage, for example of 5 V, is no longer in the voltage range of the sensor.
  • Listed below are possible errors that can cause such an in-range failure, which can eventually lead to over-pressure and eventually system destruction. For example, an increase in electrical resistance in the supply line can cause negative offset drifts and negative gain drifts, resulting in overpressure. This is due to the reduction of the supply voltage for the sensor.
  • the voltage is lowered from ⁇ by a short circuit and can be detected by the ECU, when the signal voltage reaches an appropriate range.
  • a partial short circuit minimum resistance
  • This type of "weak" short-circuit means that the pressure measured by the ECU is less than the actual value, which can eventually lead to overpressure.
  • Tuning is sometimes performed to increase the power of the corresponding engine.
  • the signal from the high-pressure sensor is specifically tuned so that it has a lower voltage.
  • the maximum rail pressure reached becomes higher than the pressure measured by the ECU. This leads to an increase in the injection quantity, since the throughput is higher at a higher rail pressure.
  • the present invention is based on the object
  • Transfer function identifies a straight horizontal line after its maximum calibrated pressure value P max has been reached. This means that there is no further increase of the signal voltage over P max .
  • Freezing the voltage value (cutting off the signal voltage) during the pumping process now indicates that the actual pressure has reached the maximum calibrated pressure of the sensor. In this case, a freezing of the voltage value can not take place if the actual pressure within the
  • Transfer function range is because pump and Einspritzvor ⁇ gears generate corresponding pressure fluctuations.
  • an overpressure as a result of an area-internal fault of the pressure sensor can therefore be determined when the pressure determined by the control unit lies below the maximum calibrated pressure value of the pressure sensor.
  • the inventive method is carried out in particular on a pressure sensor which serves to detect the pressure in the rail of an internal combustion engine.
  • the method according to the invention will now be described in detail by means of an exemplary embodiment in conjunction with the single FIGURE.
  • the single figure shows pressure and pump capacity as a function of time, each in a diagram.
  • the supply voltage was reduced on a rail pressure sensor to simulate drift (negative gain drift).
  • drift negative gain drift
  • the pressure measured by an ECU is always lower than the actual rail pressure measured by an external reference pressure sensor.
  • the pumping process continues because the rail pressure measured by the ECU is below 2,000 bar. Therefore, the actual rail pressure continues to increase until it reaches the maximum calibrated pressure value of the sensor (2,400 bar). From this pressure level, the pressure measured by the ECU is frozen even though the pump's output is nearing full capacity.
  • the pressure value of an external reference pressure sensor used is frozen at 3,000 bar, since the maximum calibrated pressure value for this sensor is 3,000 bar and the actual pressure still rises above 3,000 bar.
  • the external reference pressure sensor has no in-range error since the frozen or cut voltage is at the maximum calibrated pressure value and not above or below.
  • the measured from the ECU pressure bar frozen a ⁇ at about 1,800.
  • the pressure sensor should be able to measure up to 2,400 bar (maximum calibrated pressure). There is always an active pumping process approaching the full capacity.
  • the signal voltage measured by the ECU therefore has a negative drift, ie the actual pressure is around 600 bar higher than the measured pressure, at the point where freezing of the signal voltage value begins. It is therefore determined an internal error of the pressure sensor.
  • the actual rail pressure measured by an external reference pressure sensor is shown.
  • the rail pressure measured by the ECU is represented on the basis of a negative drift signal voltage. Since the actual rail pressure reaches the maximum calibrated pressure of the sensor, the voltage signal is frozen. This is due to the fact that the pressure sensor has reached the upper range limit of its transfer function.
  • the second diagram shows the pump delivery rate as a function of time.
  • the rail pressure control unit ECU

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Measuring Fluid Pressure (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

Procédé pour la détection d'erreurs dans un capteur de pression analogique L'invention concerne un procédé pour la détection d'une erreur interne d'un capteur de pression analogique. Dans le procédé, une mesure de pression est réalisée avec le capteur de pression et une unité de commande raccordée à celui-ci, ainsi qu'une mesure de pression avec un capteur de pression de référence externe. Lorsque la pression réelle mesurée par le capteur de pression de référence externe dépasse la valeur de pression maximale étalonnée du capteur de pression, la pression mesurée par le capteur de pression est gelée par l'unité de commande. Une erreur interne du capteur de pression est constatée lorsque la pression déterminée par l'unité de commande correspondant à la valeur de pression maximale étalonnée diffère de la pression réelle mesurée.
PCT/EP2018/053908 2017-03-22 2018-02-16 Procédé pour la détection d'erreurs dans un capteur de pression analogique Ceased WO2018171990A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017204827.1A DE102017204827B4 (de) 2017-03-22 2017-03-22 Verfahren zur Fehlererfassung bei einem analogen Drucksensor
DE102017204827.1 2017-03-22

Publications (1)

Publication Number Publication Date
WO2018171990A1 true WO2018171990A1 (fr) 2018-09-27

Family

ID=61244611

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2018/053908 Ceased WO2018171990A1 (fr) 2017-03-22 2018-02-16 Procédé pour la détection d'erreurs dans un capteur de pression analogique

Country Status (2)

Country Link
DE (1) DE102017204827B4 (fr)
WO (1) WO2018171990A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19959678A1 (de) * 1999-12-10 2001-06-21 Bosch Gmbh Robert Verfahren zum Abgleich von Sensoren
DE102008024956A1 (de) * 2008-05-23 2009-11-26 Continental Automotive Gmbh Verfahren zur Überprüfung eines Drucksensors einer Kraftstoffspeichervorrichtung
DE102008043413A1 (de) * 2008-11-03 2010-05-06 Robert Bosch Gmbh Verfahren und Vorrichtung zur Plausibilisierung des Ausgangssignals eines Raildrucksensors
DE102014214452B3 (de) * 2014-07-23 2015-06-11 Continental Automotive Gmbh Verfahren und Vorrichtung zur Detektion eines fehlerhaften Raildrucksensors
US20160053706A1 (en) * 2013-04-11 2016-02-25 Robert Bosch Gmbh Method for operating a common-rail system of a motor vehicle having a redundant common-rail-pressure sensor

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008001444A1 (de) 2008-04-29 2009-11-05 Robert Bosch Gmbh Verfahren zum Bestimmen eines Überdrucks in einem Kraftstoffspeicher eines Einspritzsystems einer Brennkraftmaschine
JP5464185B2 (ja) 2011-09-05 2014-04-09 株式会社デンソー 燃料噴射制御システム
GB2543473A (en) 2015-06-03 2017-04-26 Gm Global Tech Operations Llc Method of diagnosing a fuel rail pressure sensor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19959678A1 (de) * 1999-12-10 2001-06-21 Bosch Gmbh Robert Verfahren zum Abgleich von Sensoren
DE102008024956A1 (de) * 2008-05-23 2009-11-26 Continental Automotive Gmbh Verfahren zur Überprüfung eines Drucksensors einer Kraftstoffspeichervorrichtung
DE102008043413A1 (de) * 2008-11-03 2010-05-06 Robert Bosch Gmbh Verfahren und Vorrichtung zur Plausibilisierung des Ausgangssignals eines Raildrucksensors
US20160053706A1 (en) * 2013-04-11 2016-02-25 Robert Bosch Gmbh Method for operating a common-rail system of a motor vehicle having a redundant common-rail-pressure sensor
DE102014214452B3 (de) * 2014-07-23 2015-06-11 Continental Automotive Gmbh Verfahren und Vorrichtung zur Detektion eines fehlerhaften Raildrucksensors

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
FOXWELL: "Diagnosing CRD faults with a Pressure Tester", 8 February 2014 (2014-02-08), XP055471443, Retrieved from the Internet <URL:http://www.foxwell.com.au/diagnosing-crd-faults-with-a-pressure-tester/> [retrieved on 20180430] *

Also Published As

Publication number Publication date
DE102017204827A1 (de) 2018-09-27
DE102017204827B4 (de) 2019-08-08

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