EP0145674A2 - Dispositif diagnostique pour un système d'arrêt et de redémarrage pour un moteur à combustion interne pour véhicules - Google Patents

Dispositif diagnostique pour un système d'arrêt et de redémarrage pour un moteur à combustion interne pour véhicules Download PDF

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Publication number
EP0145674A2
EP0145674A2 EP84830277A EP84830277A EP0145674A2 EP 0145674 A2 EP0145674 A2 EP 0145674A2 EP 84830277 A EP84830277 A EP 84830277A EP 84830277 A EP84830277 A EP 84830277A EP 0145674 A2 EP0145674 A2 EP 0145674A2
Authority
EP
European Patent Office
Prior art keywords
output
level
signal
monitoring
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.)
Withdrawn
Application number
EP84830277A
Other languages
German (de)
English (en)
Other versions
EP0145674A3 (fr
Inventor
Renato Guagliumi
Oscar Blazic
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.)
Marelli Europe SpA
Original Assignee
Marelli Autronica SpA
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 Marelli Autronica SpA filed Critical Marelli Autronica SpA
Publication of EP0145674A2 publication Critical patent/EP0145674A2/fr
Publication of EP0145674A3 publication Critical patent/EP0145674A3/fr
Withdrawn legal-status Critical Current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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
    • F02D41/266—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor the computer being backed-up or assisted by another circuit, e.g. analogue
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/08—Safety, indicating, or supervising devices
    • F02B77/083—Safety, indicating, or supervising devices relating to maintenance, e.g. diagnostic device
    • 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
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C5/00—Registering or indicating the working of vehicles
    • G07C5/08—Registering or indicating performance data other than driving, working, idle, or waiting time, with or without registering driving, working, idle or waiting time
    • G07C5/0808—Diagnosing performance data

Definitions

  • the present invention relates to a diagnostic device for a system for controlling the stopping and restarting ('stop-start') of an internal combustion engine for motor vehicles, comprising a plurality of electrical sensor means for producing two-level electrical signals indicative of the condition of members which control the running of the engine (for example, the gear lever, clutch pedal, etc) and/or of respective monitored parameters or ranges (for example, the engine temperature), and an electronic monitoring and control unit with a microprocessor, connected at input to the sensor means and at output to actuating means (switches in the ignition circuit and in the supply circuit for the starter motor, solenoid valves for interrupting the fuel supply, etc.) for causing the engine to stop and start.
  • actuating means switching in the ignition circuit and in the supply circuit for the starter motor, solenoid valves for interrupting the fuel supply, etc.
  • the object of the present invention is to provide a diagnostic device by means of which it is possible to carry out quickly and rapidly both monitoring of the running of the engine and, in particular, diagnosis of the causes of any malfunctions of such a system.
  • a device of the aforesaid type characterised in that it includes interrogation means for carrying out a succession of sequential cyclical scans of the outputs of the sensor means, and for generating at each scan, and producing at a pre-arranged output, a serial signal comprising a plurality of two-level signal portions, each indicative of the level of the signal produced at the output of a respective sensor means, and in that it further includes a separate signalling device which is electrically connectible to the interrogation means for converting the successive portions of the serial signal into corresponding perceptible signals.
  • a system 1 for controlling the stopping and restarting of the internal combustion engine of a motor vehicle comprises, in known manner, a plurality of electrical sensors indicated 3, for example, switches functioning as position sensors, and 4 for example,threshold temperature sensors.
  • the sensors 3, 4 are connected to an electronic monitoring and control unit, generally indicated 5, having a microprocessor.
  • This unit may comprise, for example, a microcomputer 6 of the so-called “single chip” type, and a power output stage 7 having its inputs connected to the outputs of the microcomputer 6 and its outputs connected to actuating devices 8 and any display devices 9.
  • the actuating devices 8 may comprise, for example, electrically-controlled switches located in the ignition circuit of the engine and in the supply circuit for the starter motor of the engine, and solenoid valves for shutting off the fuel supply pipe to the engine.
  • the display devices 9 may comprise pilot lamps or light-emitting diodes mounted on the instrument panel of the motor vehicle to signal the operating state of the stop-start device and, hence, of the engine of the motor vehicle.
  • the microcomputer 6 is preset to implement a monitoring and diagnosing programme in which there is carried out a succession of sequential cyclical scans of the outputs of the sensors 3, 4 and also , if necessary, of at least some of its own output connected to the actuators 8, for generating at each scan, and producing at a pre-arranged output (the output indicated 0 in Figure 1, to which a display device is connected in the example illustrated), a serial signal having substantially a waveform such as that indicated A in Figure 2.
  • Each portion of the serial signal has a duration T ( Figure 2) and is indicative of the level of the signal produced at the output of a corresponding sensor 3 or 4, or by a corresponding output of the monitoring and control unit 5.
  • each portion of the serial signal comprises a first "high” level part followed by a second "low” level part.
  • the duration of the first part can assume a first value t or a second value t 2 , with t, ⁇ t 2 ⁇ T.
  • Each portion of the serial signal A with the part at level "1" having a duration t 1 indicates that the output of the corresponding sensor or corresponding output of the monitoring and control unit 5 is at level "0".
  • Each portion of the serial signal A of which the first part has a duration t 2 indicates that the output of the corresponding sensor 3 or 4, or the corresponding output of the monitoring and control unit 5, is at level "1".
  • the waveform A shown in Figure 2 corresponds to the following sequence "0”, “0”, “1”, "0” and "1".
  • the diagnostic device comprises a movable part 2, including a series/parallel convertor 10 intended to be electrically connected to the putput 0 of the monitoring and control unit 5 so as to effect the electrical connection of the movable part 2 to the control system 1.
  • Light-emitting diodes D 1 to D n are connected in order to the outputs of the series/ parallel convertor.
  • the number n of diodes is equal to the number of sensors 3 or 4 and outputs of the monitoring and control unit 5, which are interrogated by the microcomputer 6 during each cyclical scan.
  • the light-emitting diodes D 1 to D have their anodes connected to the positive pole of a d.c. voltage source V constituted, for example, by the battery of the motor vehicle.
  • the series/parallel convertor 10 incorporates an input 10a for controlling the conversion , to which is connected the output of a monostable control circuit 11.
  • the latter has its input connected to the input of the series/parallel convert r, and it therefore receives the serial signal A transmitted to the convertor.
  • This monostable circuit is preset to produce a signal which changes to a "high” level each time the signal fed to its input has an ascending front, and remains at the "high” level for a duration t 3 between t 1 and t 2 .
  • the waveform B represents the waveform of the signal output by the monostable circuit 11 in operation, and supplied to the conversion control input 10a of the series/parallel convertor 10.
  • the series/parallel convertor 10 converts the serial signal A. Since, as stated, the characteristic duration of the monostable circuit 11 lies between t 1 and t 21 the portion of serial signal A illustrated in Figure 2 is reconverted to the sequence 00101. This sequence represents the states of the outputs of the series/parallel convertor when the portion of the serial signal A shown in Figure 2 is converted into a parallel form.
  • the light-emitting diodes associated with the first, second and the fourth portions of the serial signal receive a current , while the diodes associated with the third and last portions of the serial signal shown in Figure 2 remain unlit.
  • the light-emitting diodes D connected to the series/parallel convertor provide an instant visual indication of the state of the monitored outputs of the sensors and the monitoring and control unit 5.
  • the clutch pedal can be pressed and then released.
  • the microcomputer 6 is programmed to carry out the aforementioned succession of sequential cyclical scans using entirely conventional techniques which will not therefore be described further.
  • the output 0 from which the serial signal A is obtainable may be constituted by an otherwise unused output of the electronic monitoring and control unit 5 or, if no unused output is available, as in the example illustrated, use can be made of an output already intended for other purposes, for example, for controlling a light-emitting indicator.
  • the serial signal is superimposed on the control signal of the indicator. So as not to interfere with the functioning of the indicator, the serial signal should have a very restricted duration for each scan (for example 2 milliseconds), whereby it cannot cause a perceptible activation of the light-emitting indicator when the latter is unlit, and cannot cause the indicator to be perceptibly extinguished when it is lit.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
EP84830277A 1983-12-02 1984-10-16 Dispositif diagnostique pour un système d'arrêt et de redémarrage pour un moteur à combustion interne pour véhicules Withdrawn EP0145674A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT6826483 1983-12-02
IT68264/83A IT1159992B (it) 1983-12-02 1983-12-02 Dispositivo diagnostico per un sistema di controllo dello spegnimento e del riavviamento di un motore a combustione interna per autoveicoli

Publications (2)

Publication Number Publication Date
EP0145674A2 true EP0145674A2 (fr) 1985-06-19
EP0145674A3 EP0145674A3 (fr) 1986-08-13

Family

ID=11308756

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84830277A Withdrawn EP0145674A3 (fr) 1983-12-02 1984-10-16 Dispositif diagnostique pour un système d'arrêt et de redémarrage pour un moteur à combustion interne pour véhicules

Country Status (2)

Country Link
EP (1) EP0145674A3 (fr)
IT (1) IT1159992B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU595245B2 (en) * 1986-10-07 1990-03-29 Kioritz Corporation Apparatus for confirming and reporting the operating conditions of a chain saw or the like
EP1052495A2 (fr) * 1999-05-11 2000-11-15 Toyota Jidosha Kabushiki Kaisha Appareil de diagnose pour moteur à combustion interne

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1427133A (en) * 1971-11-24 1976-03-10 Smiths Industries Ltd Vehicles including monitoring and/or controlling apparatus
US4156232A (en) * 1977-08-01 1979-05-22 Aeroflash Signal Corporation Single wire light control system
DE2803145A1 (de) * 1978-01-25 1979-07-26 Bosch Gmbh Robert Verfahren und einrichtung zum automatischen abstellen und erneuten starten eines motors zur kraftstoffeinsparung
US4234866A (en) * 1977-12-26 1980-11-18 Nissan Shatai Co., Ltd. Centralized alarm system for vehicles
US4274144A (en) * 1979-12-31 1981-06-16 Acf Industries, Incorporated Fuel control system development apparatus
DE3226330A1 (de) * 1981-07-27 1983-02-10 Toyota Jidosha K.K., Toyota, Aichi Automatisches motorabschalt/wiederanlasssystem
EP0081807A1 (fr) * 1981-12-12 1983-06-22 Robert Bosch Gmbh Circuit pour indication optique de grandeurs
US4447801A (en) * 1980-09-06 1984-05-08 Yamaha Hatsudoki Kabushiki Kaisha Trouble shooting method of vehicles

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1427133A (en) * 1971-11-24 1976-03-10 Smiths Industries Ltd Vehicles including monitoring and/or controlling apparatus
US4156232A (en) * 1977-08-01 1979-05-22 Aeroflash Signal Corporation Single wire light control system
US4234866A (en) * 1977-12-26 1980-11-18 Nissan Shatai Co., Ltd. Centralized alarm system for vehicles
DE2803145A1 (de) * 1978-01-25 1979-07-26 Bosch Gmbh Robert Verfahren und einrichtung zum automatischen abstellen und erneuten starten eines motors zur kraftstoffeinsparung
US4274144A (en) * 1979-12-31 1981-06-16 Acf Industries, Incorporated Fuel control system development apparatus
US4447801A (en) * 1980-09-06 1984-05-08 Yamaha Hatsudoki Kabushiki Kaisha Trouble shooting method of vehicles
DE3226330A1 (de) * 1981-07-27 1983-02-10 Toyota Jidosha K.K., Toyota, Aichi Automatisches motorabschalt/wiederanlasssystem
EP0081807A1 (fr) * 1981-12-12 1983-06-22 Robert Bosch Gmbh Circuit pour indication optique de grandeurs

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
AUTOMOTIVE ENGINEERING, vol. 91, no. 8, August 1983, pages 35-38, Society of Automotive Engineers Inc., Dallas, Texas, US; P. HOFBAUER et al.: "'Glider automatic' prevents unnecessary engine operation" *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU595245B2 (en) * 1986-10-07 1990-03-29 Kioritz Corporation Apparatus for confirming and reporting the operating conditions of a chain saw or the like
EP1052495A2 (fr) * 1999-05-11 2000-11-15 Toyota Jidosha Kabushiki Kaisha Appareil de diagnose pour moteur à combustion interne
EP1052495A3 (fr) * 1999-05-11 2002-01-23 Toyota Jidosha Kabushiki Kaisha Appareil de diagnose pour moteur à combustion interne

Also Published As

Publication number Publication date
IT8368264A0 (it) 1983-12-02
IT1159992B (it) 1987-03-04
EP0145674A3 (fr) 1986-08-13

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