EP0129776A1 - Control device for an internal combustion engine - Google Patents

Control device for an internal combustion engine Download PDF

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Publication number
EP0129776A1
EP0129776A1 EP84106741A EP84106741A EP0129776A1 EP 0129776 A1 EP0129776 A1 EP 0129776A1 EP 84106741 A EP84106741 A EP 84106741A EP 84106741 A EP84106741 A EP 84106741A EP 0129776 A1 EP0129776 A1 EP 0129776A1
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EP
European Patent Office
Prior art keywords
speed
engine
injection
rotation
control rod
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
EP84106741A
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German (de)
French (fr)
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EP0129776B1 (en
Inventor
Hans Dipl.-Ing. Schreiber
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.)
Siemens AG
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Siemens AG
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Publication date
Family has litigation
Priority to DE3323106 priority Critical
Priority to DE19833323106 priority patent/DE3323106A1/en
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0129776A1 publication Critical patent/EP0129776A1/en
Application granted granted Critical
Publication of EP0129776B1 publication Critical patent/EP0129776B1/en
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6202502&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0129776(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Expired legal-status Critical Current

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/0097Electrical control of supply of combustible mixture or its constituents using means for generating speed signals
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D31/00Use of speed-sensing governors to control combustion engines, not otherwise provided for
    • F02D31/001Electric control of rotation speed
    • F02D31/007Electric control of rotation speed controlling fuel supply
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/30Controlling fuel injection
    • F02D41/38Controlling fuel injection of the high pressure type
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/02Circuit arrangements for generating control signals
    • F02D41/14Introducing closed-loop corrections
    • F02D41/1401Introducing closed-loop corrections characterised by the control or regulation method
    • F02D2041/1413Controller structures or design
    • F02D2041/1432Controller structures or design the system including a filter, e.g. a low pass or high pass filter

Abstract

1. An arrangement for controlling an internal combustion engine : - comprising a fuel injection pump with a regulating rod (11) controlled by a stepping motor (16) to positions which in each case determine the quantity of injected fuel ; - comprising a position regulator (9) which determines the position of the regulating rod in dependence upon the difference between a theoretical position value and an actual position value, the position regulator consisting of a micro-computer which calculates the number of regulating steps to be executed by the stepping motor (16) for each quantity of injected fuel, each regulating step changing the quantity of injected fuel by the same amount, and where the absolute value of the quantity of injected fuel is determined by the number and direction of the regulating steps, commencing from a calibration point ; - comprising a speed of rotation indicator in the form of a toothed disc (1, 2) which is coupled to the motor (10) ; and - comprising a tooth pulse generator (3, 4) which scans the toothed disc (1, 2) and supplies rotational speed pulses (5) at a pulse frequency proportional to the speed of rotation ; characterised in that - the position regulator contains a rotational speed regulator (9) which determines the position of the regulating rod in dependence upon the difference between a speed of rotation signal (19) and a theoretical speed of rotation (18) ; - that a PLL-circuit is provided, supplied with the rotational speed pulses (5) and supplying an analogue voltage proportional to the curve of the rotational speed, as an actual rotation speed signal (n) ; - that the micro-computer determines the rotational speed and the change in speed of rotation between two injection points to determine therefrom the no-load state ; and - that in the no-load state the micro-computer calculates the quantity of injected fuel necessary to maintain a predetermined no-load speed, taking into account additional engine characteristics, such as temperature and pressure, to which speed it assigns the current position of the stepping motor as a calibration point.

Description

  • The invention relates to a method for determining the position of a control rod on an injection pump for internal combustion engines, in order to compare the current position with a predetermined target value in a control circuit and to adjust the position of the control rod to the target value in the event of deviations as a result of changed load on the engine, the position of the control rod being the Throughput of the injection pump and thus the instantaneous injection quantity and the speed of the engine are determined and can be changed by means of stepper motors, so that even when the load on the engine changes, the speed of the engine is within a defined speed range, with a tooth pulse generator for recording the speed of the engine on a rotating crankshaft emits a speed-dependent signal sequence.
  • Such a method for regulating internal combustion engines is known (EP 00 18 351). The throughput of an injection pump is varied by an actuator.
  • The actuator there is a control rod which is controlled by a controller, for example a microcomputer. This microcomputer can receive different signals that are representative of different engine conditions. At its output, it emits a signal that changes the position of the control rod on the injection pump using stepper motors.
  • In the known method, the starting position of the stepper motor must be known exactly before activation. Therefore, springs are provided which move the stepper motor back to its starting position in the de-energized state. It can also a switch can be provided which stops the stepper motor in its initial position. If a fixed starting position of the stepper motor is known, the microcomputer calculates the position of the control rod and thus the injection quantity at all times, since the stepper motor always executes the same countable steps. Such information about the current injection quantity is required for the engine control.
  • Mechanical components, such as springs and switches, are increasingly susceptible to faults when used for a long time. A separate place with a fastening device must also be provided for them in the engine compartment. In addition, exact adjustment of the switch or spring stop mentioned above is required.
  • The invention has for its object to determine the starting position of the stepper motor precisely and to dispense with the use of mechanical components such as springs or additional switches.
  • According to the invention, this object is achieved by
    • - That the speed-dependent output signals of the tooth pulse generator are fed to a phase locked loop, at the output of which the time profile of the motor speed can be removed as the output voltage, and
    • - That the differential quotient of this output voltage between two injection times serves as a measure of the load on the engine given by frictional losses of the engine, from which by means of engine parameters, the injection quantity necessary for maintaining the engine speed is determined, which in turn always has a specific position of the control rod on the injection pump represents.
  • With the method according to the invention, a calibration point for the position of the control rod is determined by determining the position for a specific injection quantity. A Tooth pulse generator measures the time course of the engine speed, from which one obtains a measure of the instantaneous load on the engine. If additional consumers, such as the alternator, are switched on, the engine speed between two injection points drops more than with a lower load on the engine. In order to keep the average speed constant, the injection quantity is changed depending on the load, so that the load is a measure of the current injection quantity. With a known load, this is clearly related to the position of the control rod.
  • The advantage of the method according to the invention is that a calibration point is determined by a single determination of the load by means of a speed measurement. The associated position of the control rod is known for a specific injection quantity.
  • The steps of the stepper motor are the same size and countable. Furthermore, the change in the injection quantity due to a step of the stepping motor is known. Starting from the calibration point, all steps of the stepper motor are registered in the microcomputer. From the injection quantity of the calibration point and the number of steps of the stepper motor, the current injection quantity is to be determined at every point in time.
  • A device for carrying out the method according to the invention obtains the required time course of the speed by means of a tooth pulse generator. This feeds speed-dependent output signals to a phase locked loop (PLL), a phase discriminator and a low-pass filter being connected in series and a voltage-controlled oscillator being arranged between the output of the low-pass filter and an input of the phase discriminator. The input voltage of the voltage-controlled oscillator is then an image of the time course of the speed.
  • According to one embodiment of the invention, the speed can be regulated in idle mode so that it cannot fall below a minimum value and cannot exceed a maximum value. The previously determined extreme values for the speed are continuously compared in an idle control loop of the microcomputer with the current speed value. If the speed falls below the minimum value, the injection quantity is increased. If the engine speed exceeds the maximum value, the injection quantity is reduced.
  • The method according to the invention has the advantage that not only the change in the injection quantity, but also the absolute value of the injection quantity is known at all times, without the position of the control rod having to be determined by additional measuring devices at the start of operation. A mechanical continuation of the control rod into an idle position - after switching off the engine - can also be omitted.
  • The invention will be explained in more detail with reference to an exemplary embodiment shown roughly schematically in the drawing:
    • 1 shows a device for determining the time course of the speed of an internal combustion engine,
    • 2 illustrates a limitation of the speed between an upper and a lower extreme value,
    • 3 shows a time course of the speed at a low load on the engine within a speed range,
    • 4 shows the time course of the speed at high load on the engine within a speed range,
    • 5 illustrates a device for controlling a diesel engine using a microcomputer and stepper motors.
  • Markings are on a rotating disk 1 according to FIG. 1, which is connected to the crankshaft of an engine molded on elements 2. A tooth pulse generator 3 registers the marking elements 2 and sends out a signal sequence. From this, an evaluation circuit 4 generates a speed-modulated signal S which is fed to a phase discriminator 61 in a phase locked loop (PLL) 6. A low-pass filter 62 is connected in series with the phase discriminator 61. A voltage controlled oscillator 63 is connected between the output of the low pass 62 and an input of the phase discriminator 61. The input voltage of the voltage-controlled oscillator 63 is then an image of the time profile of the speed n of the rotating disc 1, as shown in FIGS. 3 and 4. Time t is plotted there on the abscissa and speed n is plotted on the ordinate. At a low load on the engine, the speed n decreases less due to friction losses between two injection times 7 and 8 - FIG. 3 - than at high engine loads; see Fig. 4.
  • An idle control circuit 91 according to FIG. 2, which is arranged within a microcomputer 9 according to FIG. 5, is supplied with limit values 12 and 13 for the rotational speed via a feed line 18 and the instantaneous value of the rotational speed via a line 19. The idle control loop 91 decreases the amount of injection in an engine 10 by moving a quantity actuator over a control rod 11 when the speed reaches a predetermined upper limit 12 and increases the amount of injection when the speed reaches a predetermined lower limit 13; compare FIGS. 3 and 4. The friction losses 14 of the motor 10 according to FIG. 2 remove mechanical work from the motor 10. 3 and 4, the upper limit value 12 and the lower limit value 13 are marked on the ordinate. The speed then only varies within a band between the two limit values 12 and 13.
  • The speed curve between two injection points 7 and 8 illustrates the load state of the engine when idling. Using further engine parameters 15, such as temperature and pressure, a microcomputer 9 according to FIG. 5 determines the injection quantity necessary for maintaining the engine speed at the current load. In the case of a known fixed load, the calculated current injection quantity defines a position of the control rod 11 on the injection pump which is related to this injection quantity. This pair of values serves as a calibration point, so that the instantaneous injection quantity is then to be determined from the position of the control rod 11 at any time.
  • When the microcomputer 9 calculates a change in the position of the control rod 11 on the basis of the information supplied to it, the control rod 11 is moved in steps by a stepping motor 16 and the completion of each step is reported back to the microcomputer 9 via the line 17. Starting from the calibration point, all steps of the stepping motor 16 are registered, as a result of which the exact position of the control rod 11 is known at all times.
  • Each step of the stepping motor 16 means a change in the injection quantity by a constant value. Therefore, from the knowledge of the steps of the stepping motor 16 stored in the microcomputer 9, and thus the changes in position of the control rod 11, the change in the injection quantity compared to the calibration point can be clearly determined.
  • By means of the known calibration point, the instantaneous injection quantity is known at each position of the control rod 11, whereby further measures for controlling the engine are made possible.

Claims (3)

1. Method for determining the position of a control rod (11) on an injection pump for internal combustion engines, in order to compare the current position with a predetermined setpoint in a control circuit and to adjust the position of the control rod (11) to the setpoint in the event of deviations as a result of changed load on the engine (10) , The position of the control rod (11) determines the throughput of the injection pump and thus the instantaneous injection quantity and the speed of the motor (10) and can be changed by means of stepper motors (16), so that the speed of the motor even when the load on the motor (10) changes (10) lies within a defined speed range, a tooth pulse generator (3) emitting a speed-dependent signal sequence (5) for recording the speed of the engine (10) on a rotating crankshaft, characterized in that
- That the speed-dependent output signals (5) of the tooth pulse generator (3) are fed to a phase locked loop (6), at the output of which the time curve of the motor speed can be removed as the output voltage, and
- That the differential quotient of this output voltage between two injection times (7 and 8) serves as a measure of the load on the engine given by friction losses (14) of the engine (10), from which, by means of engine parameters (15), the injection quantity necessary for maintaining the engine speed is determined , which in turn represents a specific position of the control rod (11) on the injection pump at any time.
2. Device for performing the method according to claim 1 with a tooth pulse generator (3) for position detection of marking elements (2) on a rotating disc (1) on a crankshaft of an internal combustion engine, characterized in that the tooth pulse generator (3) speed-dependent output signals (5) a phase locked loop (6) feeds, with the tooth pulse generator (3) a phase discriminator (61) and a low-pass filter (62) are connected in series and a voltage-controlled oscillator (63) between the output of the low-pass filter (62) and an input of the phase discriminator (61) is switched on.
3. The method according to claim 1, characterized in
- That the previously measured speed is compared with a predetermined lower limit (13) and a predetermined upper limit (12) of the speed in a microcomputer, and
- That the injection quantity is increased when the measured speed reaches the lower limit (13) and reduced when it reaches the upper limit (12).
EP84106741A 1983-06-27 1984-06-13 Control device for an internal combustion engine Expired EP0129776B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE3323106 1983-06-27
DE19833323106 DE3323106A1 (en) 1983-06-27 1983-06-27 Method and device for determining the position of a control rod on an injection pump for combustion engines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT84106741T AT29765T (en) 1983-06-27 1984-06-13 Arrangement for controlling an internal combustion engine.

Publications (2)

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EP0129776A1 true EP0129776A1 (en) 1985-01-02
EP0129776B1 EP0129776B1 (en) 1987-09-16

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EP84106741A Expired EP0129776B1 (en) 1983-06-27 1984-06-13 Control device for an internal combustion engine

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EP (1) EP0129776B1 (en)
JP (1) JPS6013952A (en)
AT (1) AT29765T (en)
DE (1) DE3323106A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2658246A1 (en) * 1990-02-10 1991-08-16 Bosch Gmbh Robert Method and device for controlling a fuel injection pump controlled by electromagnetic valve.
EP0566281A1 (en) * 1992-04-15 1993-10-20 Zexel Corporation Electronic controller of fuel supplying device for engine
CN109083791A (en) * 2018-09-30 2018-12-25 潍柴动力股份有限公司 The fault detection method and fault detection means of engine oil spout driving

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3442373A1 (en) * 1984-11-20 1986-05-28 Voest Alpine Friedmann Circuit for monitoring a stepper motor
DE4014966A1 (en) * 1990-05-10 1991-11-14 Kloeckner Humboldt Deutz Ag Engine diagnosis method using temp. chamber sensitive element - to measure combustion chamber temp. at indication of engine load
JP2784608B2 (en) * 1990-09-28 1998-08-06 日立建機株式会社 Motor speed control device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2252490A1 (en) * 1973-11-28 1975-06-20 Alsthom Cgee Electronic speed control method for I.C. engine - controls fuel flow with stepping motor fed with electric impulses
FR2301691A1 (en) * 1975-02-19 1976-09-17 Bosch Gmbh Robert Method and device for obtaining a measured value for a appr
US3991727A (en) * 1974-06-14 1976-11-16 Nippon Soken, Inc. Electronically controlled fuel injection system
DE3015004A1 (en) * 1979-04-20 1981-01-08 Aisan Ind Fuel-air mixture control for carburettor of IC engine - calculates engine speed from measured crankshaft speed and compares it with required speed
GB2078400A (en) * 1980-06-21 1982-01-06 Bosch Gmbh Robert Control means for speed control of a compression ignition internal combustion engine
GB2079007A (en) * 1980-06-30 1982-01-13 Diesel Kiki Co Fuel injection apparatus for internal combustion engines

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4502437A (en) * 1981-11-02 1985-03-05 Ambac Industries, Incorporated Electrical fuel control system and method for diesel engines

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2252490A1 (en) * 1973-11-28 1975-06-20 Alsthom Cgee Electronic speed control method for I.C. engine - controls fuel flow with stepping motor fed with electric impulses
US3991727A (en) * 1974-06-14 1976-11-16 Nippon Soken, Inc. Electronically controlled fuel injection system
FR2301691A1 (en) * 1975-02-19 1976-09-17 Bosch Gmbh Robert Method and device for obtaining a measured value for a appr
DE3015004A1 (en) * 1979-04-20 1981-01-08 Aisan Ind Fuel-air mixture control for carburettor of IC engine - calculates engine speed from measured crankshaft speed and compares it with required speed
GB2078400A (en) * 1980-06-21 1982-01-06 Bosch Gmbh Robert Control means for speed control of a compression ignition internal combustion engine
GB2079007A (en) * 1980-06-30 1982-01-13 Diesel Kiki Co Fuel injection apparatus for internal combustion engines

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2658246A1 (en) * 1990-02-10 1991-08-16 Bosch Gmbh Robert Method and device for controlling a fuel injection pump controlled by electromagnetic valve.
EP0566281A1 (en) * 1992-04-15 1993-10-20 Zexel Corporation Electronic controller of fuel supplying device for engine
US5339781A (en) * 1992-04-15 1994-08-23 Zexel Corporation Electronic governor of fuel supplying device for engine
CN109083791A (en) * 2018-09-30 2018-12-25 潍柴动力股份有限公司 The fault detection method and fault detection means of engine oil spout driving

Also Published As

Publication number Publication date
AT29765T (en) 1987-10-15
DE3323106A1 (en) 1985-01-10
EP0129776B1 (en) 1987-09-16
JPS6013952A (en) 1985-01-24

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