WO1995007409A1 - Fault diagnosis method for injectors of internal combustion engine high-pressure injection systems - Google Patents

Fault diagnosis method for injectors of internal combustion engine high-pressure injection systems Download PDF

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Publication number
WO1995007409A1
WO1995007409A1 PCT/EP1994/002919 EP9402919W WO9507409A1 WO 1995007409 A1 WO1995007409 A1 WO 1995007409A1 EP 9402919 W EP9402919 W EP 9402919W WO 9507409 A1 WO9507409 A1 WO 9507409A1
Authority
WO
WIPO (PCT)
Prior art keywords
coil
determining
short
capacitor
voltage
Prior art date
Application number
PCT/EP1994/002919
Other languages
French (fr)
Inventor
Riccardo Groppo
Paolo Tubetti
Giorgio Bortignon
Original Assignee
Robert Bosch 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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Priority to DE69410431T priority Critical patent/DE69410431T2/en
Priority to JP50844295A priority patent/JP3936997B2/en
Priority to EP94927542A priority patent/EP0668963B1/en
Publication of WO1995007409A1 publication Critical patent/WO1995007409A1/en

Links

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
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • 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
    • F02D41/221—Safety or indicating devices for abnormal conditions relating to the failure of actuators or electrically driven elements
    • 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
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/2003—Output circuits, e.g. for controlling currents in command coils using means for creating a boost voltage, i.e. generation or use of a voltage higher than the battery voltage, e.g. to speed up injector opening
    • F02D2041/2006—Output circuits, e.g. for controlling currents in command coils using means for creating a boost voltage, i.e. generation or use of a voltage higher than the battery voltage, e.g. to speed up injector opening by using a boost capacitor
    • 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
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
    • F02D2041/2031—Control of the current by means of delays or monostable multivibrators
    • 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
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/2068—Output circuits, e.g. for controlling currents in command coils characterised by the circuit design or special circuit elements
    • F02D2041/2075—Type of transistors or particular use thereof
    • 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
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/2086—Output circuits, e.g. for controlling currents in command coils with means for detecting circuit failures
    • F02D2041/2089—Output circuits, e.g. for controlling currents in command coils with means for detecting circuit failures detecting open circuits
    • 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
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/2086—Output circuits, e.g. for controlling currents in command coils with means for detecting circuit failures
    • F02D2041/2093—Output circuits, e.g. for controlling currents in command coils with means for detecting circuit failures detecting short circuits
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Definitions

  • the present invention relates to a fault diagnosis method for the injectors of internal combustion engine high-pressure injection systems, in particular for detecting short-circuiting or open circuits on the injector coils.
  • high-pressure injection systems comprise a number of injectors, opening and closing of which are controlled by means of a respective coil and a control circuit. Any short-circuiting or open circuits on the coil must therefore be detected immediately to ensure correct operation of the injector and also prevent damage to the injector, control circuit. This applies in particular to short-circuiting of the injector, which, if not detected immediately, may result in such high currents as to irreparably damage the electronic components of the control circuit.
  • a fault diagnosis method for the injectors of internal combustion engine high-pressure injection systems comprising the steps of: supplying an injector coil for a predetermined time; discharging said coil into a storage capacitor; measuring the charge of said storage capacitor; and comparing said charge with a predetermined threshold.
  • Figure 1 shows an electric diagram of the circuit controlling the injectors of a high-pressure electronic injection system
  • Figure 2 shows graphs of a number of electrical quantities measured in the Figure 1 circuit using the method according to the present invention and relative to the absence and presence of short-circuiting on the injector coil;
  • Figure 3 shows graphs of a number of electrical quantities measured in the Figure 1 circuit and relative to the absence and presence of an open circuit
  • Figure 4 shows a flow chart illustrating the steps in one embodiment of the method according to the present invention.
  • Circuit 1 shows a simplified diagram of the circuit 1 for controlling a number of injectors.
  • Circuit 1 comprises a number of actuator circuits M. , M_, ... connected parallel to one another between a supply line 4 and a ⁇ fround line 5, and each comprising, in series, a coil L , L_, ... for controlling a respective injector, a twisted ca_ble C , C , ... of appropriate length, and a controlled switch S. , S_, ... .
  • a voltage source 7 is also connected, via a decoupling diode 8, between supply line 4 and ground line 5.
  • the common node N , N_, ... between each coil L_, L_, ... and each controlled switch S. , S structuri, ... is connected to a terminal 11 of a storage or tank capacitor 12 via a respective decoupling diode D-, D_, ... with its cathode connected to terminal 11; and terminal 11 is connected to supply line 4 via a controlled switch 14.
  • the method according to the present invention is performed during startup, as soon as the ignition key is turned, to prevent the engine from being started up in the event of a fault which may impair operation or even cause irreparable damage to the component parts of control circuit 1.
  • the method consists in briefly and successively turning on the controlled switches of the coils to connect the switches successively to the battery.
  • the current through the supplied actuator circuit is low (due to the short connection time) , and is high in the event of short-circuiting of the coil.
  • the controlled switch is turned off, the current from the previously supplied actuator circuit is transferred to storage capacitor 12 which therefore charges to a voltage depending on the amount of current transferred, which in turn is related to the current through the previously supplied actuator circuit.
  • the capacitor charges to a much higher voltage as compared with a properly connected coil, so that short-circuiting may be detected by calculating the voltage increase of the capacitor and comparing it with a threshold value.
  • Figure 2 shows a graph of the current through the injector circuit and a corresponding graph of the capacitor voltage in the event of correct connection (curves A, B) and short-circuiting ' (curves C, D) of the coil.
  • Figure 3 shows graphs of the voltage of storage capacitor 12 in the event of an open circuit on a coil (curve E) and correct connection of all the coils (curve F relative to a different supply voltage value) .
  • storage capacitor 12 is discharged after each coil is tested, for better indicating, each time," the charge of the capacitor, the final value of which depends on various parameters, including the initial voltage prior to current transfer.
  • block 20 measures the voltage V(0) of capacitor 12; block 21 sets an injector counter i. to i; and block 22 closes switch S. for a very short time Tl, e.g. from 3 to 30 ⁇ s, which time must be long enough to permit current flow, but short enough to prevent damaging the controlled switch in the event of short-circuiting (in which case, the current may reach a few tens of Amps) .
  • Tl very short time
  • block 28 determines whether all the injectors have been tested. If they have not, block 28 goes back to block 22; if they have, block
  • the method described therefore provides for indicating any faults without damaging the control circuit, by first performing the short-circuit test indicating the more hazardous condition and which, by virtue of the very short length of time the switches are closed, poses no risk to the circuit, and by subsequently performing the open-circuit test which may thus be performed in the most appropriate" manner by closing the controlled switches for a greater length of time to allow a greater current flow and so indicate any open circuits with no danger of damaging the circuit.
  • the method according to the present invention is straightforward and reliable, and may be program implemented with no complex, high-cost alterations to the circuitry.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

A method consisting in successively supplying the injector coils (L1, L2) for a predetermined time by closing the respective switch (S1, S2); discharging the supplied coil into a storage capacitor (12); measuring the charge of the storage capacitor following discharge of the coil; and comparing the measured charge value with a predetermined threshold. A short-circuit test is first performed by supplying each coil for a very short time interval, to prevent the current flow from damaging the control circuit (1) in the event of short-circuiting, and by determining the measured charge is below a first threshold. Subsequently, an open-circuit test is performed by supplying each coil for a longer time interval, and by determining the measured charge is above a second threshold.

Description

FAULT DIAGNOSIS METHOD FOR INJECTORS OF INTERNAL COMBUSTION ENGINE HIGH-PRESSURE INJECTION SYSTEMS
TECHNICAL FIELD
The present invention relates to a fault diagnosis method for the injectors of internal combustion engine high-pressure injection systems, in particular for detecting short-circuiting or open circuits on the injector coils.
BACKGROUND ART
As is known, high-pressure injection systems comprise a number of injectors, opening and closing of which are controlled by means of a respective coil and a control circuit. Any short-circuiting or open circuits on the coil must therefore be detected immediately to ensure correct operation of the injector and also prevent damage to the injector, control circuit. This applies in particular to short-circuiting of the injector, which, if not detected immediately, may result in such high currents as to irreparably damage the electronic components of the control circuit.
DISCLOSURE OF INVENTION It is an object of the present invention to provide a straightforward, reliable method of diagnosing short-circuiting and open circuits on injectors.
According to the present invention, there is provided a fault diagnosis method for the injectors of internal combustion engine high-pressure injection systems, 'characterized in that it comprises the steps of: supplying an injector coil for a predetermined time; discharging said coil into a storage capacitor; measuring the charge of said storage capacitor; and comparing said charge with a predetermined threshold.
BRIEF DESCRIPTION OF DRAWINGS
A preferred, non-limiting embodiment of the present invention will be described by way of example with reference to the accompanying drawings, in which:
Figure 1 shows an electric diagram of the circuit controlling the injectors of a high-pressure electronic injection system;
Figure 2 shows graphs of a number of electrical quantities measured in the Figure 1 circuit using the method according to the present invention and relative to the absence and presence of short-circuiting on the injector coil;
Figure 3 shows graphs of a number of electrical quantities measured in the Figure 1 circuit and relative to the absence and presence of an open circuit;
Figure 4 shows a flow chart illustrating the steps in one embodiment of the method according to the present invention.
BEST MODE FOR CARRYING OUT THE INVENTION Figure 1 shows a simplified diagram of the circuit 1 for controlling a number of injectors. Circuit 1 comprises a number of actuator circuits M. , M_, ... connected parallel to one another between a supply line 4 and a ςfround line 5, and each comprising, in series, a coil L , L_, ... for controlling a respective injector, a twisted ca_ble C , C , ... of appropriate length, and a controlled switch S. , S_, ... . A voltage source 7 is also connected, via a decoupling diode 8, between supply line 4 and ground line 5. - -
The common node N , N_, ... between each coil L_, L_, ... and each controlled switch S. , S„, ... is connected to a terminal 11 of a storage or tank capacitor 12 via a respective decoupling diode D-, D_, ... with its cathode connected to terminal 11; and terminal 11 is connected to supply line 4 via a controlled switch 14. The method according to the present invention is performed during startup, as soon as the ignition key is turned, to prevent the engine from being started up in the event of a fault which may impair operation or even cause irreparable damage to the component parts of control circuit 1.
The method consists in briefly and successively turning on the controlled switches of the coils to connect the switches successively to the battery. At this step, if the coil is connected properly, the current through the supplied actuator circuit is low (due to the short connection time) , and is high in the event of short-circuiting of the coil. When the controlled switch is turned off, the current from the previously supplied actuator circuit is transferred to storage capacitor 12 which therefore charges to a voltage depending on the amount of current transferred, which in turn is related to the current through the previously supplied actuator circuit. In the event of short-circuiting, the capacitor charges to a much higher voltage as compared with a properly connected coil, so that short-circuiting may be detected by calculating the voltage increase of the capacitor and comparing it with a threshold value.
The above behaviour patterns are shown in Figure 2, which shows a graph of the current through the injector circuit and a corresponding graph of the capacitor voltage in the event of correct connection (curves A, B) and short-circuiting' (curves C, D) of the coil.
After all the coils in the circuit have been short-circuit tested (with no fault being detected on any of the coils) , a check is made to determine the presence of open circuits, for which purpose, the controlled switches of the coils are turned on successively, as for short-circuit testing, but for a greater length of time. In the event of an open circuit on the coil, no current flows through the coil, so that, when the respective controlled switch is turned off, no current is transferred to charge capacitor 12. In this case also, therefore, correct or incorrect connection of the injector coils may be detected by measuring the voltage increase of the capacitor.
Figure 3 shows graphs of the voltage of storage capacitor 12 in the event of an open circuit on a coil (curve E) and correct connection of all the coils (curve F relative to a different supply voltage value) . In this test, storage capacitor 12 is discharged after each coil is tested, for better indicating, each time," the charge of the capacitor, the final value of which depends on various parameters, including the initial voltage prior to current transfer.
One embodiment will now be described with reference to Figure 4.
To begin with, block 20 measures the voltage V(0) of capacitor 12; block 21 sets an injector counter i. to i; and block 22 closes switch S. for a very short time Tl, e.g. from 3 to 30 μs, which time must be long enough to permit current flow, but short enough to prevent damaging the controlled switch in the event of short-circuiting (in which case, the current may reach a few tens of Amps) .
Block 23 then measures the voltage V(i) of the capacitor; block 24 calculates the difference DV1 = V(i) - V(i-l) ; and block 25 compares voltage difference DV1 with a threshold Kl. If DV1 exceeds threshold Kl, block
26 generates an error signal to prevent startup of the engine. Conversely, if DV1 is below threshold Kl, block
27 increments the counter; and block 28 determines whether all the injectors have been tested. If they have not, block 28 goes back to block 22; if they have, block
28 goes on to block 30.
Block 30 initializes two injector and fault (open circuit) counters i. and j; block 31 discharges capacitor 12 (e.g. by closing switch 14 until capacitor 12 reaches the voltage of source 7) ; block 32 measures the voltage V(0) of the discharged capacitor 12; block 33 turns on switch S. for a time T2, e.g. from 70 to 200 μs; block 34 measures the voltage V(i) of capacitor 12; block 35 calculates the difference DV2 = V(i) - V(0) ; and block 36 compares the voltage difference with a threshold K2. If DV2 is above threshold K2, block 36 goes on to block 37 which increments counter i, and to block 38 which determines whether all the injectors have been tested. if they have, the procedure is terminated. If they have not, block 38 goes back to block 31.
Conversely, if DV2 is below threshold K2, block 36 goes on to block 41 which increments the fault counter j; block 42 generates a signal indicating an open circuit on the i-th coil; and block 43 determines whether it is the first open circuit to be detected. If it is, block 43 goes back to block 37. Conversely, if a second open circuit is detected (j = 2) , block 43 goes on to block 44 which signals an open circuit on the second coil, so that the diagnostic control system disables startup of the engine.
The method described therefore provides for indicating any faults without damaging the control circuit, by first performing the short-circuit test indicating the more hazardous condition and which, by virtue of the very short length of time the switches are closed, poses no risk to the circuit, and by subsequently performing the open-circuit test which may thus be performed in the most appropriate" manner by closing the controlled switches for a greater length of time to allow a greater current flow and so indicate any open circuits with no danger of damaging the circuit. Moreover, the method according to the present invention is straightforward and reliable, and may be program implemented with no complex, high-cost alterations to the circuitry.
Clearly, changes may be made to the method as described and illustrated herein without, however, departing from the scope of the present invention.

Claims

1) A fault diagnosis method for the injectors of internal combustion engine high-pressure injection systems, characterized in that it comprises the steps of: supplying an injector coil (L. , !_ ) for a predetermined time; discharging said coil into a storage capacitor (12) ; measuring the charge of said storage capacitor; , and comparing said charge with a predetermined threshold.
2) A method as claimed in Claim 1, characterized in that it comprises the step of -determining short-circuiting of said injector coil (L. , L_) and wherein said coil is supplied for a first very short time interval (Tl) .
3) A method as claimed in Claim 2, characterized in that said first time interval ranges from 3 to 30 μs.
4) A method as claimed in Claim 2 or 3, characterized in that said step of determining short-circuiting of said injector coil (L., L_) is followed by the step of determining the presence of open circuits and wherein said coil is supplied for a second time interval (T2) greater than said first time interval (Tl) . 5) A method as claimed in Claim 4, characterized in that said second time interval ranges from 50 to 200 μs.
6) A method as claimed in any one of the foregoing Claims, characterized in that said step of measuring said charge comprises the step of determining the voltage increase of said storage capacitor (12) as said coil (L-, L2) is discharged. 7) A method as claimed in Claim 6, characterized in that, to determine short-circuiting of said injector coil (L-v L 2) * said step of determining said voltage increase comprises the step of memorizing the charge value of sa;Ld capacitor (12) immediately prior to said step of supplying said coil; measuring the voltage of said capacitor after said charging step; and determining the difference between said memorized charge value and said measured voltage.
8) A method as claimed in Claim 6, characterized in that, to determine the presence of open circuits on said injector coil (L1 , L_) , said step of determining said voltage increase comprises the step of discharging said capacitor (12) immediately prior to said step of supplying said coil; memorizing the discharge value of said capacitor; measuring the voltage of said capacitor after said charging step; and determining the difference between said memorized discharge value and said measured voltage.
9) A method as claimed in any one of the foregoing Claims, characterized in that, in the event a short-circuit is detected, a signal is generated to prevent startup of the engine.
10) A method as claimed in any one of the foregoing Claims, characterized in that, in the event more than one open circuit is detected, a signal is generated to prevent startup of the engine.
11) A fault diagnosis method for the injectors of internal combustion engine high-pressure injection systems, substantially as described and illustrated herein with reference to the accompanying drawings.
PCT/EP1994/002919 1993-09-07 1994-09-02 Fault diagnosis method for injectors of internal combustion engine high-pressure injection systems WO1995007409A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE69410431T DE69410431T2 (en) 1993-09-07 1994-09-02 FAULT DIAGNOSIS METHOD FOR THE INJECTION NOZZLE OF HIGH PRESSURE INJECTION SYSTEMS OF THE INTERNAL COMBUSTION ENGINE
JP50844295A JP3936997B2 (en) 1993-09-07 1994-09-02 Error diagnosis method for each injector of internal combustion engine high pressure injection device
EP94927542A EP0668963B1 (en) 1993-09-07 1994-09-02 Fault diagnosis method for injectors of internal combustion engine high-pressure injection systems

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO93A000653 1993-09-07
ITTO930653A IT1261580B (en) 1993-09-07 1993-09-07 INJECTOR FAULT DIAGNOSIS METHOD OF HIGH PRESSURE INJECTION SYSTEMS FOR INTERNAL COMBUSTION ENGINES

Publications (1)

Publication Number Publication Date
WO1995007409A1 true WO1995007409A1 (en) 1995-03-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1994/002919 WO1995007409A1 (en) 1993-09-07 1994-09-02 Fault diagnosis method for injectors of internal combustion engine high-pressure injection systems

Country Status (5)

Country Link
EP (1) EP0668963B1 (en)
JP (1) JP3936997B2 (en)
DE (1) DE69410431T2 (en)
IT (1) IT1261580B (en)
WO (1) WO1995007409A1 (en)

Cited By (6)

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GB2312530A (en) * 1996-04-26 1997-10-29 Daimler Benz Ag Monitoring fuel injection system
GB2377507A (en) * 2001-07-13 2003-01-15 Mitsubishi Electric Corp Failure detection in coil circuits of fuel injection apparatus
EP1103710A3 (en) * 1999-11-27 2003-04-09 Robert Bosch Gmbh Method and apparatus for controlling a load
CN102477927A (en) * 2010-11-24 2012-05-30 联创汽车电子有限公司 Fault simulating and driving current collecting circuit of oil sprayer of automobile engine
US20130230932A1 (en) * 2012-03-02 2013-09-05 Venkatraghavan Bringivijayaraghavan Through-substrate via (tsv) testing
US10267253B2 (en) 2014-05-13 2019-04-23 Hitachi Automotive Systems, Ltd. Fuel injection system for internal combustion engine

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DE10016556B4 (en) * 1999-04-30 2007-10-11 Robert Bosch Gmbh Device and method for monitoring the activation of an actuator, in particular an electromagnetic consumer
US7252072B2 (en) * 2003-03-12 2007-08-07 Cummins Inc. Methods and systems of diagnosing fuel injection system error
DE102007026947B4 (en) * 2007-06-12 2009-06-10 Continental Automotive Gmbh Method and device for operating an injection valve

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2748062A1 (en) * 1996-04-26 1997-10-31 Daimler Benz Ag FUEL INJECTION SYSTEM WITH MONITORED OPERATION
US5778852A (en) * 1996-04-26 1998-07-14 Mercedes-Benz Ag Functionally monitored fuel injection system
GB2312530B (en) * 1996-04-26 1998-09-09 Daimler Benz Ag A fuel injection system
GB2312530A (en) * 1996-04-26 1997-10-29 Daimler Benz Ag Monitoring fuel injection system
EP1103710A3 (en) * 1999-11-27 2003-04-09 Robert Bosch Gmbh Method and apparatus for controlling a load
GB2377507B (en) * 2001-07-13 2003-07-23 Mitsubishi Electric Corp Failure detection circuit of a fuel injection apparatus
GB2377507A (en) * 2001-07-13 2003-01-15 Mitsubishi Electric Corp Failure detection in coil circuits of fuel injection apparatus
DE10200847B4 (en) * 2001-07-13 2010-09-23 Mitsubishi Denki K.K. Error detection device of a fuel injection device for a multi-cylinder internal combustion engine
CN102477927A (en) * 2010-11-24 2012-05-30 联创汽车电子有限公司 Fault simulating and driving current collecting circuit of oil sprayer of automobile engine
CN102477927B (en) * 2010-11-24 2013-11-06 联创汽车电子有限公司 Fault simulating and driving current collecting circuit of oil sprayer of automobile engine
US20130230932A1 (en) * 2012-03-02 2013-09-05 Venkatraghavan Bringivijayaraghavan Through-substrate via (tsv) testing
US9157960B2 (en) * 2012-03-02 2015-10-13 Micron Technology, Inc. Through-substrate via (TSV) testing
US9929064B2 (en) 2012-03-02 2018-03-27 Micron Technology, Inc. Through-substrate via (TSV) testing
US10267253B2 (en) 2014-05-13 2019-04-23 Hitachi Automotive Systems, Ltd. Fuel injection system for internal combustion engine

Also Published As

Publication number Publication date
JP3936997B2 (en) 2007-06-27
ITTO930653A0 (en) 1993-09-07
ITTO930653A1 (en) 1995-03-07
JPH08503535A (en) 1996-04-16
DE69410431T2 (en) 1998-09-17
IT1261580B (en) 1996-05-23
DE69410431D1 (en) 1998-06-25
EP0668963B1 (en) 1998-05-20
EP0668963A1 (en) 1995-08-30

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