GB2226896A - "Abnormality detecting system for electric circuits" - Google Patents

"Abnormality detecting system for electric circuits" Download PDF

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Publication number
GB2226896A
GB2226896A GB8928587A GB8928587A GB2226896A GB 2226896 A GB2226896 A GB 2226896A GB 8928587 A GB8928587 A GB 8928587A GB 8928587 A GB8928587 A GB 8928587A GB 2226896 A GB2226896 A GB 2226896A
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GB
United Kingdom
Prior art keywords
current
difference
signal
circuit
detecting
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.)
Withdrawn
Application number
GB8928587A
Other versions
GB8928587D0 (en
Inventor
Kazuyuki Tazawa
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.)
Subaru Corp
Original Assignee
Fuji Jukogyo KK
Fuji Heavy Industries Ltd
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 Fuji Jukogyo KK, Fuji Heavy Industries Ltd filed Critical Fuji Jukogyo KK
Publication of GB8928587D0 publication Critical patent/GB8928587D0/en
Publication of GB2226896A publication Critical patent/GB2226896A/en
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B23/00—Testing or monitoring of control systems or parts thereof
    • G05B23/02—Electric testing or monitoring
    • G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
    • G05B23/0218—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults
    • G05B23/0224—Process history based detection method, e.g. whereby history implies the availability of large amounts of data
    • G05B23/0227—Qualitative history assessment, whereby the type of data acted upon, e.g. waveforms, images or patterns, is not relevant, e.g. rule based assessment; if-then decisions
    • G05B23/0235—Qualitative history assessment, whereby the type of data acted upon, e.g. waveforms, images or patterns, is not relevant, e.g. rule based assessment; if-then decisions based on a comparison with predetermined threshold or range, e.g. "classical methods", carried out during normal operation; threshold adaptation or choice; when or how to compare with the threshold
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
    • G01R15/202—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices using Hall-effect devices
    • 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
    • F02D2041/2058—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit using information of the actual current value
    • 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
    • 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
    • F02D2041/228—Warning displays
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/22—Detection or location of defective computer hardware by testing during standby operation or during idle time, e.g. start-up testing
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/22—Flexible AC transmission systems [FACTS] or power factor or reactive power compensating or correcting units

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)

Description

1 k_J ' 0 j.
"Abnormality Detectinq System for Electric Circuits" The present invention relates to a system for detecting abnormality in an electric circuit connected to an electronic control unit used in an electronic control system such as a control system for a motor vehicle.
The electronic control unit provided on the motor vehicle has a plurality of operating circuits for operating various actuators such as fuel injectors. A recent electronic control unit has a self-diagnostic circuit for diagnosing operations of the operating circuits.
Japanese Patent Application Laid-Open 63-27769 discloses a selfdiagnostic system for confirming the proper operation of operating circuits in an electronic control system for a motor vehicle. In such a self-diagnostic system a shunt is provided in a bus for detecting current in the bus. The system has a detecting circuit comprising a window comparator and a logic product circuit for detecting the operation of each operating circuit.
In order to detect the current in the operating circuit, a current detecting sensor comprising a resistor is used because it is the simplest in structure. The voltage between terminals of the resistor is measured as a parameter of the current. However, in such a measurement, the resistor is added to the original load as an additional load 1 ' - 2 which changes the impedance of the circuit, and thus influences the characteristics of the circuit.
Fig. 5a shows a current detecting sensor 50 which detects the current in a circuit without influencing the characteristic of the current. The sensor 50 comprises a core 51 made of ferrite and having a winding wound around the core 51 to form a transformer, a Hall element 52, and an amplifier 53. The winding is connected to a line of an operating circuit. When power is applied to the operating circuit, a magnetic field is formed in the current detecting sensor 50. The magnetic flux flows through the Hall element 52, so that a voltage is produced in the Hall element 52, which is amplified by the amplifier 53.
As shown in Fig. 5b, the current detecting sensor 50 has a linear output characteristic. An offset voltage exists in the Hall element 52 and appears at the output terminal of the sensor 50 as an offset voltage VO. The offset voltage VO varies with the temperature of the sensor 50, with time and other factors.
Accordingly, the output voltage varies irregularly. Consequently, the absolute current cannot be detected by the current sensor 50, and hence operational abnormalities of the circuit cannot be detected. Thus it is necessary to eliminate the influence of the offset voltage on the output voltage.
1 3 The present invention seeks to provide an abnormality detecting system in which a current detecting sensor is provided for detecting the current in an operating circuit accurately:and without-the influence of temperature and whereby deterioration of the-sensor and faults in the.circuit may be reliably detected.
According to the present invention. there is provided an abnormality detecting system for an electric circuit comprising first means for detecting current flowing in the electric circuit before a control signal is signal. applied to the circuit and for producing a first current/, second detector means for detecting the current of the said control signal at a predetermined time after the/detection by the first detector means and for producing a second current signal means for ccLiculatng the difference between the first and second current and for producing a difference current, means for comparing the difference current with a reference value and for producing the difference between the difference current and the reference value, andmeans for determining whether the difference is abnormal.
One embodiment of the;Lnvention will now be described by way of example with reference to the accompanying drawings, in which:
1 4 Fig. 1 is a block diagram showing a circuit of an abnormality detecting system according to the present invention; Fig. 2 is a functional block diagram o:C the system; Fig. 3 is a flowchart showi ng the operation of the system; Fig. 4 shows waveforms of an injector drive pulse and an injector current; Fig. Sa is an illustration showing a current detecting sensor of the system; and Fig. 5b shows a graph showing the characteristic of the sensor.
Referring to Fig. 1, an electronic control unit (ECU) I is provided in an automobile for controlling the engine,--the items transmission, an air-conditioner and other/. The electronic control unit I comprises a central processor unit (CPU) 2, a ROM 3, a RAM 4, a non-volatile RAM 4a, an output interface 5 and an input interface 6, which are connected to each other through a bus line 7. The ROM 3 stores various control programs for controlling various systems.
The engine control system will be described hereinafter.
The output interface 5 is connected to the base'of each- of the-Internal transistors.11 and 12 and the external transistor 13 through resistors 8, 9 and 10, respectively. The collectors of the transistors 11, 12 and 13 comprise actuator operating circuits A and are connected to various actuators such as a coil 16a of fuel injector 16, a coil 17a of an idle speed control valve 17, and an ignition coil 19a respectively. These coils are connected to a battery 20 through a current detecting sensor 22 and bus 21. The output interface 5 is further connected to a self-diagnosis lamp 14 for indicating abnormal operation of the actuators. The current detecting sensor 22 is provided for detecting current IL flowing in each actuator operating circuit A.
The input interface 6 is supplied with the voltage from the battery 20 and the voltage from the current detecting sensor 22 through an A/D converter 23. Further, output signals from various sensors such as an intake-air quantity sensor, a crank angle sensor and an 02 sensor are also applied to the input interface 6.
The ROM 3 stores fixed data and the RAM 4 is provided for storing data of output signals from sensors 24 and data processed at the CPU 2. The nonvolatile RAM 4a is provided to store fault data of actuators 16, 17 and 19, sensor 24 and others. The RAM 4a is backed up by the battery 20 so as to maintain the stored data even.if a key switch (not shown) is in offstate.
The CPU 2 makes calculations of control data based on data stored in the RAM 4 in accordance with control programs stored in the ROM 3. The calculated control data are stored in the RAM 4 and applied to actuators 16, 17 and 19 through the output interface 5 at a predetermined timing. If an abnormality is detected, the CPU 3 produces a signal to illuminate the lamp 14.
Referring to Fig. 2, the electronic control unit is provided with a controlling parameter input processing means 30 supplied with output signals from the sensors 24, the battery 20 and current detecting sensor 22 for performing a waveform shaping process and an analog-digital conversion process. Process signals are applied to a control value calculator means 31 and then stored in memory means 32. The calculator means 31 is provided for calculating various control values based on the input signals in accordance with the control programs.
An output processing means 33 is provided for producing control signals for controlling the actuator operating circuits A.
An offset value determining means 34 is provided for determining the output voltage corresponding to an output current of the current detecting sensor 22 as an offset voltage corresponding to an offset current when a zero control current, calculated by the control value calculator means 31, is applied to the actuator operating circuit A.
A circuit condition determining means 35 is provided for determining conditions of the actuator operating circuit A.
1 11 The operation of the system is described hereinafter with reference to Figs. 1, 2, 4 and 5.
The offset voltage VO of the sensor 22 varies with the temperature of the sensor 22, with time and other factors. Therefore, in order to detect the load current, the offset voltage VO is subtracted from the output voltage of the sensor 22 as described below.
The offset voltage VO of the sensor 22 is determined by offset value determining means 34 when no control signals are applied to the actuator operating circuits A. The detected offset voltage VO is stored in the memory means 32 (RAM 4). The current in one of the circuits A is detected when a control signal is applied thereto, and the output voltage of the sensor 22 is applied to the current condition determining means 35 as an operating voltage. The stored offset voltage VO, is then subtracted from the new operating voltage V1, so as to provide a voltage signal V corresponding to an actual load current I.
As an example, the diagnosis of the circuit of the fuel injector 16 is described hereinafter with reference to Fig. 4. The offset voltage VO is obtained at the time TO when the control current Pi is produced or before the generation of the control current Pi.
Since the fuel injector 16 is an inductance load, the current Iinj of the fuel injector 16 is delayed with respect to the control signal Pi as shown in Fig. 4. The offset voltage VO may be obtained at the time to when the control signal Pi is generated. However, if the actuator is a resistive load, capacitive load or a lamp, the current is not delayed. Accordingly, the offset voltage VO must be obtained before the control signal is generated.
The circuit condition determining means 35 further compares the actual voltage V with a reference voltage VR corresponding to a reference current IR for determining abnormality and produces an abnormality signal which is applied to the self diagnosis means 36. The memory means 32 stores a plurality of reference voltages VR which are arranged in a table in accordance with the battery voltage BV as parameters. Thus when the control signal Pi is applied to the fuel injector 10, the corresponding reference voltage VR is derived from the table.
When the difference between the operating voltage V and the reference voltage VR does not fall within a predetermined allowable range AV, an abnormality of the injector operating circuit A is diagnosed.
The self-diagnosis means 36 operates to store the fault data in the memory means 32 and illuminates the lamp 14 when the circuit condition determining means 35 determines an abnormality of the actuator operation circuit A.
The fault data stored in the memory means 32 can be read by connecting another diagnostic device which is provided for servicing the vehicle so that the fault condition can be diagnosed.
i X The operation of the control unit for the fuel injector 16 is described hereinafter with reference to the flowchart of Fig. 3 and to Fig. 4.
At a step S100, a control signal (Pi of Fig. 4) for injecting fuel is applied to the fuel injector 16, so that fuel injection starts. At a step S101, a trigger signal for starting analog/digital (A/D) conversion operation is applied to the A/D converter 23 at the time To. Thus, the output voltage of the current detecting sensor 22 is converted into a digital value.
At a step S102, the output voltage of the sensor 22 at the time To is stored in a predetermined address of the RAM 4 as the offset voltage Vo by updating the previous offset voltage Vo. At a step S103, a terminating signal for stopping the A/D conversion operation is produced so that the conversion operation stops until a predetermined time TI. Since the load of the fuel injector 16 has an inductance, the current Iinj varies with time until a maximum current.
At the predetermined time T1 (for example at a time when the current becomes substantially maximum), the conversion of the output voltage of the sensor 22 into a digital value starts C 1 (step S104). At a step S105, the current ILT1 of the fuel inejctor 16 at the time Tl is converted into a digital signal and the voltage BV of the battery 20 is also converted into a digital signal. These digital signals are stored in the respective addresses of the RAM 4.
At a step S106, the offset voltage Vo and the operating voltage V1 are read from the RAM 4 for calculating the actual voltage V corresponding to the actual load current V (V = V1 - VO). At a step S107, the reference voltage VR is derived from the ROM 3 in accordance with the battery voltage BV as parameter, and the difference VD between the reference current VR and the actual voltage V is calculated (VD = V - VR).
At a step S108, it is determined whether the difference VD is smaller than a predetermined allowable value A V or not. If the difference VD is smaller than the allowable value A V, the program returns to step S100 to repeat the routine. If the difference VD is larger than the allowable value AV, the program goes to a step S109 where a fault of the fuel injector 16 is determined. The self-diagnosis means 36 stores fault data of the fuel injector in the non-volatile RAM 4a and illuminates the lamp 14.
Since the current difference (relative value) between the initial current ILTo and the maximum current ILT1 is compared with the reference value, the current in the operating circuit can be accurately detected without a C - X being influences by temperature, deterioration of the sensor or other factors.
While the presently preferred embodiment of the present invention has been shown and described, it is to be understood that this disclosure is for the purpose of illustration and that various changes and modifications may be made within the scope of the appended claims.
a cl l-

Claims (3)

1. An abnormality detecting system for an electric circuit comprising:
first means for detecting current flowing in the electric circuit, before a control signal is applied to the circuit and for producing a first current signal; second detector means for detecting the current of the control signal at a predetermined time after the said detection by the first detector means and for producing a second current signal; means for calculating the difference between the first and second currents and for producing a difference signal; means for comparing the difference signal with a reference value and for producing the difference between the difference signal and the reference value; and means for determining whether the difference is abnormal.
2. A system according to claim 1, wherein:
the predetermined time is set at a time when the current reaches a maximum value under normal conditions.
3. A method for detecting abnormal operation in an electric circuit comprising the steps of (a) detecting current flowing in the electric cc circuit before a control signal is applied to the circuit and producing a first current signal; (b) detecting the current in the electric circuit at a predetermined time after the detection of the first current and producing a second current signal; (c) calculating the difference between the first and second current signals and producing a difference signal; and (d) comparing the difference signal with a reference value and determining whether the difference is abnormal.
Published 1990 at The patent office, State House, 6671 High I-Iolborn,1, ondonWC1R4TP. Further copies maybe obtained from The Patent Office
GB8928587A 1988-12-20 1989-12-19 "Abnormality detecting system for electric circuits" Withdrawn GB2226896A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63323110A JPH02165070A (en) 1988-12-20 1988-12-20 Abnormality detector for electric circuit

Publications (2)

Publication Number Publication Date
GB8928587D0 GB8928587D0 (en) 1990-02-21
GB2226896A true GB2226896A (en) 1990-07-11

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ID=18151191

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8928587A Withdrawn GB2226896A (en) 1988-12-20 1989-12-19 "Abnormality detecting system for electric circuits"

Country Status (3)

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JP (1) JPH02165070A (en)
DE (1) DE3942165A1 (en)
GB (1) GB2226896A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0602343A2 (en) * 1992-10-23 1994-06-22 Konica Corporation Abnormality detection circuit for a motor for use in a copier
US6489693B1 (en) 1999-02-15 2002-12-03 Isabellenhutte Heusler Gmbh Kg Method and device for current monitoring in a current supply system
DE102004053953A1 (en) * 2004-11-09 2006-05-11 Daimlerchrysler Ag Testing vehicle electronics involves activating component(s)/controller(s), measuring vehicle current, determining activated component/controller current drain from difference of vehicle, total battery current with controllers in test mode

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DE4116757C1 (en) * 1991-05-23 1992-08-27 Robert Seuffer Gmbh & Co, 7260 Calw, De
US6218643B1 (en) 1991-07-18 2001-04-17 Mitsubishi Denki Kabushiki Kaisha Power supplying apparatus for automotive part
DE4338462B4 (en) * 1993-11-11 2004-04-22 Hella Kg Hueck & Co. Control system for electrical consumers in motor vehicles
DE4341425B4 (en) * 1993-12-04 2004-05-06 Robert Bosch Gmbh Method for determining the current flowing through a load in a motor vehicle
DE19513081A1 (en) * 1995-04-07 1996-10-10 Bosch Gmbh Robert Method and device for monitoring the measured value acquisition in an electronic power control of a vehicle engine
DE19526806A1 (en) * 1995-07-13 1997-01-16 Siemens Ag Vehicle electrical system with multiplex control for motor vehicles
DE102004023577A1 (en) * 2004-05-13 2005-12-08 Adam Opel Ag Monitoring device for motor vehicle records and stores total time that vehicle is driven for example in low oil pressure condition

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Publication number Priority date Publication date Assignee Title
EP0157997A2 (en) * 1983-11-16 1985-10-16 Santrade Ltd. Programmable multi-channel tool monitor with multiple alarm limits and sensor taring

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JPS57158566A (en) * 1981-03-26 1982-09-30 Toyo Commun Equip Co Ltd Live wire current measuring device
JPS6327769A (en) * 1986-07-21 1988-02-05 Jidosha Kiki Co Ltd Apparatus for confirming operation of electric circuit
JPS6375571A (en) * 1986-09-18 1988-04-05 Kaize Denki Kk Processing method for offset value or the like
JPH06327769A (en) * 1993-05-21 1994-11-29 Terumo Corp Plasma treating device

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
EP0157997A2 (en) * 1983-11-16 1985-10-16 Santrade Ltd. Programmable multi-channel tool monitor with multiple alarm limits and sensor taring

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0602343A2 (en) * 1992-10-23 1994-06-22 Konica Corporation Abnormality detection circuit for a motor for use in a copier
EP0602343A3 (en) * 1992-10-23 1997-01-22 Konishiroku Photo Ind Abnormality detection circuit for a motor for use in a copier.
US6489693B1 (en) 1999-02-15 2002-12-03 Isabellenhutte Heusler Gmbh Kg Method and device for current monitoring in a current supply system
DE102004053953A1 (en) * 2004-11-09 2006-05-11 Daimlerchrysler Ag Testing vehicle electronics involves activating component(s)/controller(s), measuring vehicle current, determining activated component/controller current drain from difference of vehicle, total battery current with controllers in test mode

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Publication number Publication date
JPH02165070A (en) 1990-06-26
GB8928587D0 (en) 1990-02-21
DE3942165A1 (en) 1990-06-21

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)