GB2085681A - Control means for electromagnetically actuatable fuel injection valves - Google Patents

Control means for electromagnetically actuatable fuel injection valves Download PDF

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Publication number
GB2085681A
GB2085681A GB8123314A GB8123314A GB2085681A GB 2085681 A GB2085681 A GB 2085681A GB 8123314 A GB8123314 A GB 8123314A GB 8123314 A GB8123314 A GB 8123314A GB 2085681 A GB2085681 A GB 2085681A
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GB
United Kingdom
Prior art keywords
valves
control
control means
electromagnets
thyristors
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
Application number
GB8123314A
Other versions
GB2085681B (en
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.)
KARL MARX STADT AUTOMOBILBAU
Original Assignee
KARL MARX STADT AUTOMOBILBAU
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 KARL MARX STADT AUTOMOBILBAU filed Critical KARL MARX STADT AUTOMOBILBAU
Publication of GB2085681A publication Critical patent/GB2085681A/en
Application granted granted Critical
Publication of GB2085681B publication Critical patent/GB2085681B/en
Expired 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
    • F02D41/20—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
    • F02D41/30—Controlling fuel injection
    • F02D41/32—Controlling fuel injection of the low pressure type
    • F02D41/36—Controlling fuel injection of the low pressure type with means for controlling distribution
    • 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
    • F02D2041/2051—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit using voltage control
    • 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
    • F02D2041/2068—Output circuits, e.g. for controlling currents in command coils characterised by the circuit design or special circuit elements
    • F02D2041/2082—Output circuits, e.g. for controlling currents in command coils characterised by the circuit design or special circuit elements the circuit being adapted to distribute current between different actuators or recuperate energy from actuators
    • 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

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

Abstract

Control means for controlling electromagnetically actuated valves of a fuel injection system comprises a circuit for putting the valves out of operation in the event of a fault. The electromagnets (61 to 64) of the valves are controlled from a common power stage through the intermediary of an electronic distributor device (5) comprising thyristors (51 to 54). A control circuit (3) which responds to faulty states is present for governing a shunt circuit in parallel with the electronic distributor device, the output of the control circuit (3) being connected directly or indirectly with the control inputs of such a number of the thyristors that when those thyristors are switched by the control circuit (3) into the conducting state the resulting current flow to the associated electromagnets is insufficient to maintain energisation thereof. The valves associated with such electromagnets are therefore closed. <IMAGE>

Description

SPECIFICATION Control means for electromagnetically actuable fuel injection valves The present invention relates to control means for electromagnetically actuable injection valves of a fuel injection system, and has particular reference to circuit means for causing the valves to be closed in the event of a fault in the control of the valves.
In DD-PS 131193 there is disclosed a device which protects injection installations from providing excessive fuel deliveries in the case of defective electronics. The device relates to a power stage for the electromagnetic injection nozzles, which controls the individual nozzles via a distributor assembly. Each switched-on magnetic injection nozzle is connected to the power stage in series with a parallel RC element.
In order to prevent excessive fuel delivery, especially when the power stage is short-circuited, the series resistor in the parallel RX element is divided into two partial resistors and between these partial resistors there is connected a switching stage comprising a thyristor which, when an excessively high switched-on period occurs, triggers a shunt to the current path of the electromagnets, whereby the current in the electromagnet is reduced until the armature drops. In this manner, injection is suppressed.
A disadvantage with this device is that a separate switching stage must be provided exclusively for the fault control.
There is accordingly a need for a control circuit operable for a purpose similar to that of the abovedescribed device, but of such a construction that an additional shunt stage for reducing the current for the electromagnets of cyclically actuated injection valves can be omitted.
According to the present invention there is provided control means for controlling electromagnetically actuable injection valves of a fuel injection system, the control means comprising signal distributor means for transmission of actuating signals from a common power stage to respective electromagnets of such valves, the distributor means comprising a plurality ofthyristors controllable to determine distribution of the signals to the electromagnets, and fault recognition circuit means responsive to signal faults to cause control signals to be applied to the control inputs of such a number of the thyristors as to influence the electromagnets to cause or allow the valves to be closed.
In the case of control means embodying the present invention, additional componentry for putting out of operation ofthe electromagnetic injection valves, i.e componentry such as a power thyristor, are not required, as the function of such componentry is taken over by the thyristors of the distributor means, which are in any case present.
An embodiment of the present invention will now be more particularly described, by way of example, with reference to the single figure of the accompanying drawing, which is a schematic circuit diagram of control means according to the said embodiment.
Referring now to the drawing, there is shown a fuel injection system electronic control means incor porating a circuit for putting electromagnetic injec tion nozzles out of operation and a circuit for the cyclically correct controlling of the electromagnetic injection valves, according to DD-P 127 770. Those details of the control means for the cyclically correct controlling which are not of importance for the pres ent invention have been omitted from the drawing.
The control means for the injection system com prises a control device 1 by means of which the injection instant and the injection duration for each cylinder of an internal combustion engine are determined. The signal emitted by the control device 1 is transferred to a switching stage 2, the details of which are illustrated in the corresponding field.
Connected to the output of the control device 1 and to the output of the switching stage 2 are respective inputs of a control circuit 3, which ascertains, for example, differences between the output signals or excessively long injection times. The method of operation of this control circuit 3, as equivalence element, is described in detail in DD-P F 02 D1 211986.
Connected to the output of the switching stage 2 is a distributor device 5, the device 5 being connected by way of a series resistor Rv and of a capacitor Cv connected in parallel therewith. The distributor device 5 comprises four thyristors as parallel dis tributor switches 51 to 54, to the output of each of which is connected a respective one of four electromagnets 61 to 64 of the injection valves.
The control circuit 3 prepares a signal for putting the electromagnetic injection nozzles out of operation in the event of a faulty operating state. For this purpose, the circuit output is connected to the input of a pulse amplifier 31, the output of which is con nected to one of the inputs of each of four control stages 401 to 404 respectively associated with the distributor switches 51 to 54 in the distributor device 5. As a consequence of the fact that the switches 51 to 54 are constructed as thyristors, a self-holding effect is present when the switching range is switched on, which effect is, however, cancelled when the current is interrupted by the switching stage 2.
Other circuit arrangements are also possible for initiating the pulses of the control circuit 3 for switch ing the switches 51 to 54.
In normal operation, current flows through the switching stage 2, the combination of series resistor Rv and capacitor Cv and the distributor device 5 to one of the electromagnets 61 to 64 of the injection valves. The controlling of the control stages 401 to 404 is carried out in each case through a first input in synchronism with the engine via AND-gates 41 to 44, to the inputs of which camshaft pulses NI and crank shaft pulses KI are applied. The afore-mentioned pulses NI and Kl are derived from the injection ranges p and the angular interval you the injection sequence.
Each of the control stages 401 to 404 has a second input, the two inputs of the control stages 401 to 404 being constructed as OR-links.
When the switched-on period of the switching stage 2 is greater than the length of the control pulse, the control circuit 3 triggers a pulse which is transferred via the pulse amplifier 31 to the second inputs of all the control stages 401 to 404 of the distributor switches 51 to 54. As a consequence, all the switches 51 to 54 are switched to be conductive, which results in current supply to all the electromagnets 61 to 64 of the injection nozzles, so that to each one of the electromagnets there is supplied a low current below the value of the holding current. This causes the originally opened injection nozzle to close by de-energising of its electromagnet.

Claims (4)

1. Control means for controlling electromagnetically actuable injection valves of a fuel injection system, the control means comprising signal distributor means for transmission of actuating signals from a common power stage to respective electromagnets of such valves, the distributor means comprising a plurality of thyristors controllable to determine distribution of the signals to the electromagnets, and fault recognition circuit means responsive to signal faults to cause control signals to be applied to the control inputs of such a number of the thyristors as to influence the electromagnets to cause or allow the valves to be closed.
2. Control means as claimed in claim 1, the fault recognition circuit means being connected at an output thereof directly to the control inputs of said number of the thyristors.
3. Control means as claimed in claim 1, the fault recognition means being connected to the control inputs of said number of the thyristors through a respective OR-gate associated with each thyristor.
4. Control means for controlling electromagnetically actuable injection valves of a fuel injection system, the control means being substantialiy as hereinbefore described with reference to the accompanying drawing.
GB8123314A 1980-08-11 1981-07-30 Control means for electromagnetically actuable fuel injection valves Expired GB2085681B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DD22323180 1980-08-11

Publications (2)

Publication Number Publication Date
GB2085681A true GB2085681A (en) 1982-04-28
GB2085681B GB2085681B (en) 1983-05-25

Family

ID=5525797

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8123314A Expired GB2085681B (en) 1980-08-11 1981-07-30 Control means for electromagnetically actuable fuel injection valves

Country Status (3)

Country Link
DE (1) DE3124724C2 (en)
FR (1) FR2488334A1 (en)
GB (1) GB2085681B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2182812A (en) * 1985-10-15 1987-05-20 Mk Electric Ltd Current supply apparatus
GB2206754A (en) * 1987-07-01 1989-01-11 Printronix Inc Protection circuit for printer

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3238752C2 (en) * 1982-10-20 1986-11-13 Robert Bosch Gmbh, 7000 Stuttgart Method and device for self-monitoring of the control unit of electrical injection systems for internal combustion engines
US4589401A (en) * 1985-04-12 1986-05-20 Motorola, Inc. Injector driver fault detect and protection device

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1244925A (en) * 1968-10-23 1971-09-02 Brevete Et D Etudes S I B E So Improvements in or relating to fuel feed devices for internal combustion engines
US3835825A (en) * 1969-11-21 1974-09-17 Brico Eng Internal combustion engines
DD131193A1 (en) * 1977-05-02 1978-06-07 Gerhard Haase DEVICE FOR OUT OF OPERATION OF ELECTROMAGNETIC INJECTION UNITS
DE2805876A1 (en) * 1978-02-11 1979-08-16 Bosch Gmbh Robert ELECTRICAL MONITORING DEVICE FOR FALSE RESISTANT SENSORS AND CONSUMERS, IN PARTICULAR IN THE AREA OF FUEL MEASUREMENT IN COMBUSTION MACHINES
US4284051A (en) * 1978-09-15 1981-08-18 Robert Bosch Gmbh Switching control apparatus for electromagnetic control units
DD142738A1 (en) * 1979-04-04 1980-07-09 Gerhard Haase DEVICE FOR CONTROLLING AN EMISSION CONTROL UNIT FOR ELECTRONIC INJECTION SYSTEMS
DE2934476A1 (en) * 1979-08-25 1981-03-26 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8900 Augsburg FUEL INJECTION DEVICE FOR INTERNAL COMBUSTION ENGINES

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2182812A (en) * 1985-10-15 1987-05-20 Mk Electric Ltd Current supply apparatus
GB2182812B (en) * 1985-10-15 1989-09-27 Mk Electric Ltd Current supply apparatus
GB2206754A (en) * 1987-07-01 1989-01-11 Printronix Inc Protection circuit for printer
GB2206754B (en) * 1987-07-01 1992-03-04 Printronix Inc Protection circuit

Also Published As

Publication number Publication date
DE3124724A1 (en) 1982-03-25
FR2488334A1 (en) 1982-02-12
DE3124724C2 (en) 1984-08-30
GB2085681B (en) 1983-05-25

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Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee