EP0155273A1 - Einrichtung zur kraftstoffzummessung bei einer brennkraftmaschine. - Google Patents
Einrichtung zur kraftstoffzummessung bei einer brennkraftmaschine.Info
- Publication number
- EP0155273A1 EP0155273A1 EP84902912A EP84902912A EP0155273A1 EP 0155273 A1 EP0155273 A1 EP 0155273A1 EP 84902912 A EP84902912 A EP 84902912A EP 84902912 A EP84902912 A EP 84902912A EP 0155273 A1 EP0155273 A1 EP 0155273A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- injection
- combustion engine
- internal combustion
- control unit
- ignition
- 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.)
- Granted
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
- F02D41/24—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
Definitions
- the invention relates to a device for metering fuel in a spark-ignited internal combustion engine equipped with an injection system according to the preamble of the main claim.
- Such devices include a control unit as an essential component, the functions of which are either hard-wired in terms of hardware or freely programmable, for example, by using a microcomputer.
- control devices have already been described in detail in the relevant specialist literature and have long been part of the prior art.
- diefee control units have proven their worth with regard to the driving behavior and exhaust emissions of the engine.
- due to the relatively complicated structure of these control units there is the possibility of individual components failing. Under certain circumstances, a fault in a component that is irrelevant can paralyze the function of the entire control unit and thus also the internal combustion engine.
- the device according to the invention with the features of the main claim has the advantage that it is possible to implement emergency operation in the event of failure of the control unit without the use of such relatively complex auxiliary devices. Instead of the output signals of such auxiliary devices, the signals from the ignition system are used to control the fuel injection valves. This makes it possible to implement an extremely cost-effective emergency running concept which enables the driver of a motor vehicle equipped in this way, even with one. Failure of the control unit in a kind of emergency operation to reach the next workshop. Another advantage is the fact that the ignition signals are derived from an encoder that is not used to control the control unit. This system therefore also proves to be effective if an encoder fails for the main input variables of the control unit.
- the measures listed in the subclaims make further advantageous developments and improvements of the device proposed in the main claim possible.
- the simple coupling of the ignition system to the injection system namely the coupling via a diode and a simple changeover switch, has proven to be particularly simple and inexpensive. This feature is particularly high in those cases in which existing control devices are to be retrofitted with such a device.
- FIG. 3 shows a possible embodiment of the two exemplary embodiments in FIGS. 1 and 2.
- 10 denotes an ignition coil, which contains a primary winding 11, a secondary winding 12 and an iron core 13.
- the primary winding 11 is connected between the battery voltage U 3 and the collector of a transistor 14, the emitter of which is at ground potential.
- the base of this transistor 14 is controlled by an ignition pulse generator 15, which can be designed, for example, as a mechanical interrupter, induction sensor, Hall sensor, Wiegand sensor or also as an optical sensor.
- the secondary coil 12 of the ignition coil 10 is connected on the input side to the connection point 16 between the primary coil and the collector of the transistor 14. On the output side, the high-voltage ignition signals lead to an ignition system (not shown in further detail).
- the injection valve 20 is connected on the output side to the battery voltage U B. For the switch position of the
- Switch 19 in position B is a connection between the connection point 16 via a diode 28 with the injection valve 20.
- a fuel pump designated 21 receives its supply voltage U B via a switch 22 and is connected to ground potential with its other connection.
- the switch 22 is connected to the control unit 17 via a control line 23.
- the connection point between fuel pump 21 and switch 22 can also be connected to the potential of the supply voltage U B via a further line interrupted by a switch 24.
- Switches 19 and 24 are controlled by a relay 25, which is activated by applying the battery voltage U B via a line from the control unit. In the activated state of the relay 25, the switches 19 and 24 are in the position labeled A.
- the output lines of the control device 17 can be separated from the control device via a central plug 26.
- the relay 25 is activated by applying the battery voltage U B via the central plug 26.
- the injection pulses from the control unit reach the injection valves via line 18 and switch 19 (in position A).
- the switch 22 is closed via the control line 23 and the fuel pump 21 supplies fuel to the injection valves 20 via force lines, not shown.
- the ignition works independently of the function of the control unit and delivers the corresponding ignition pulses to the spark plugs of the internal combustion engine, which are not shown in this picture.
- the emergency drive function can be switched on by removing the central plug 26 from the control device.
- This measure is a very special embodiment; it would also be conceivable that the output lines of the control device can be interrupted via a switch mounted in the motor vehicle.
- switch 22 is then opened so that fuel pump 21 is decoupled from the supply voltage.
- the relay 25 switches in its rest position, ie the two switches 19 and 24 move to the position B shown
- the connection point 16 is approximately at ground potential and the injection valve 20 is activated via the conductive diode 28. If, on the other hand, the transistor 14 is blocked by the ignition pulse generator 15 in order to generate an ignition spark, high positive voltages occur at the connection point 16, so that the diode 28 blocks and thus the injection valve 20 closes. In this way, the injector 20 and the spark plugs are driven alternately.
- the switch 24 can be omitted.
- the injection pulses t i and the load signals t p are, as before, fed to the injection valve 20 via the switch 19 (in position A). In addition, these signals are also present at a speed relay 29 with which the switch 19 is actuated. Start signal information from a start signal transmitter 30 can also be supplied to this speed relay.
- the switch 22 for interrupting the supply voltage is not activated by the control unit 17 but actuated by a speed relay 31, which is connected on the input side to the connection point 16.
- These speed relays 29 and 31 function in such a way that they switch when the value falls below a certain value of the pulse repetition frequency applied to their input, i.e. change their output size or press the assigned switch.
- the relay is an electronic
- Controlled time stage which is either designed as a retriggerable monostable multivibrator or as a retriggerable timer.
- the timer When the battery voltage is applied, the timer is set, the relay picks up for a certain period of time and then drops again if no pulses arrive. The time period is chosen so that it is greater than the time pulse interval at the lowest speed.
- the relay is also activated immediately in the event of a fault.
- the speed relay When the engine is running, the speed relay is triggered again and again by the ignition pulses, so that the service life does not expire and the relay remains energized.
- the switching threshold for the pulse repetition frequency is in the region of 1 Hz, but it can also take on other values adapted to the vehicle.
- the speed relay 31 switches off the fuel supply to the fuel pump 21 in the event of firing pulse sequences that fall below the set threshold value.
- a possible malfunction of the control unit 17 is recognized in the present exemplary embodiment by the speed relay 29. If there are no injection pulses or if the number of injection pulses falls below an adjustable number, this switches Speed relay 29, the switch 19 in position 3, so that here too, in the same way as in the exemplary embodiment in FIG. 1, the injection valve 20 is controlled via the diode 28 by the pulses of the ignition system at the connection point 16.
- a start signal generator 30 is provided, which prevents the speed relay 29 from responding during the start phase.
- the switchover to "emergency operation" occurs automatically, i.e. it is recognized by the speed relay 29.
- the exemplary embodiment in FIG. 3 is used for active decoupling between the primary coil 11 of the ignition coil 10 and the injection valve 20.
- identical components are identified by the same numbers. The components which are not important for explaining the functioning of this exemplary embodiment have not been shown, but it is understood that this arrangement can be used in any of the previous exemplary embodiments.
- switch 19 is in position B, ie there is emergency driving operation, then in the present case the injection valve 20 is no longer directly connected to the diode 28.
- the signals from the ignition system run from the connection point 16 via the diode 28, a resistor 32, the base-collector path of a transistor 33, the base-collector path of a further transistor 34 and the switch 19 (position B) to the injection valve 20.
- the collector of the transistor 33 is connected via a resistor 35 to the supply voltage U B , while the emitters of the transistors 33 and 34 are connected to ground potential.
- This known circuit arrangement has the advantage that the primary coil 11 of the ignition coil 10, not shown, is hardly loaded and thus a sufficient decoupling between the injection valve 20 and the ignition system is achieved.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- General Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT84902912T ATE31781T1 (de) | 1983-09-08 | 1984-07-25 | Einrichtung zur kraftstoffzummessung bei einer brennkraftmaschine. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3332399A DE3332399C1 (de) | 1983-09-08 | 1983-09-08 | Einrichtung zur Kraftstoffzumessung bei einer fremdgezuendeten,mit einer Einspritzanlage ausgeruesteten Brennkraftmaschine |
DE3332399 | 1983-09-08 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0155273A1 true EP0155273A1 (de) | 1985-09-25 |
EP0155273B1 EP0155273B1 (de) | 1988-01-07 |
Family
ID=6208548
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84902912A Expired EP0155273B1 (de) | 1983-09-08 | 1984-07-25 | Einrichtung zur kraftstoffzummessung bei einer brennkraftmaschine |
Country Status (7)
Country | Link |
---|---|
US (1) | US4653450A (de) |
EP (1) | EP0155273B1 (de) |
JP (1) | JPH0654098B2 (de) |
BR (1) | BR8407061A (de) |
DE (2) | DE3332399C1 (de) |
IT (1) | IT1176637B (de) |
WO (1) | WO1985001083A1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0347446A (ja) * | 1989-07-12 | 1991-02-28 | Mitsubishi Electric Corp | 点火及び燃料系バックアップ装置 |
US5103792A (en) * | 1990-10-16 | 1992-04-14 | Stanadyne Automotive Corp. | Processor based fuel injection control system |
JPH04232361A (ja) * | 1990-12-28 | 1992-08-20 | Kokusan Denki Co Ltd | 内燃機関用インジェクタ駆動方法及び駆動装置 |
US6119670A (en) * | 1997-08-29 | 2000-09-19 | Autotronic Controls Corporation | Fuel control system and method for an internal combustion engine |
JP2002364435A (ja) * | 2001-06-01 | 2002-12-18 | Kawasaki Heavy Ind Ltd | 燃料噴射式エンジン |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3834361A (en) * | 1972-08-23 | 1974-09-10 | Bendix Corp | Back-up fuel control system |
DE2503108C3 (de) * | 1975-01-25 | 1979-09-20 | Robert Bosch Gmbh, 7000 Stuttgart | Elektrisch gesteuerte Kraftstoffeinspritzanlage mit zündungsgesteuerter Triggerstufe für eine Brennkraftmaschine |
DE2838619A1 (de) * | 1978-09-05 | 1980-03-20 | Bosch Gmbh Robert | Einrichtung zum steuern von betriebsparameterabhaengigen und sich wiederholenden vorgaengen fuer brennkraftmaschinen |
DE2945543A1 (de) * | 1979-11-10 | 1981-05-21 | Robert Bosch Gmbh, 7000 Stuttgart | Einrichtung zum steuern von betriebsparameterabhaengigen und sich wiederholenden vorgaengen fuer brennkraftmaschinen |
JPS56135201A (en) * | 1980-03-24 | 1981-10-22 | Nissan Motor Co Ltd | Pulse generator for engine control |
JPS57181939A (en) * | 1981-05-06 | 1982-11-09 | Hitachi Ltd | Fuel feed method for automobile engine |
JPS58117326A (ja) * | 1982-01-05 | 1983-07-12 | Nissan Motor Co Ltd | 自動車用危険防止装置 |
JPS58106564U (ja) * | 1982-01-13 | 1983-07-20 | 日産自動車株式会社 | 内燃機関の点火制御装置 |
JPS58144664A (ja) * | 1982-02-23 | 1983-08-29 | Nippon Denso Co Ltd | 内燃機関制御装置 |
JPS592102A (ja) * | 1982-06-29 | 1984-01-07 | Oki Electric Ind Co Ltd | 内燃機関の動作制御方式 |
-
1983
- 1983-09-08 DE DE3332399A patent/DE3332399C1/de not_active Expired
-
1984
- 1984-07-25 JP JP59502934A patent/JPH0654098B2/ja not_active Expired - Lifetime
- 1984-07-25 WO PCT/DE1984/000159 patent/WO1985001083A1/de active IP Right Grant
- 1984-07-25 DE DE8484902912T patent/DE3468482D1/de not_active Expired
- 1984-07-25 EP EP84902912A patent/EP0155273B1/de not_active Expired
- 1984-07-25 US US06/734,282 patent/US4653450A/en not_active Expired - Fee Related
- 1984-07-25 BR BR8407061A patent/BR8407061A/pt not_active IP Right Cessation
- 1984-09-03 IT IT22501/84A patent/IT1176637B/it active
Non-Patent Citations (1)
Title |
---|
See references of WO8501083A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE3468482D1 (en) | 1988-02-11 |
IT1176637B (it) | 1987-08-18 |
US4653450A (en) | 1987-03-31 |
JPH0654098B2 (ja) | 1994-07-20 |
JPS60502162A (ja) | 1985-12-12 |
IT8422501A0 (it) | 1984-09-03 |
EP0155273B1 (de) | 1988-01-07 |
DE3332399C1 (de) | 1985-02-28 |
WO1985001083A1 (en) | 1985-03-14 |
BR8407061A (pt) | 1985-08-13 |
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