EP0188404B1 - Device for controlling and regulating the operating range of a control rod in an injection combustion engine - Google Patents

Device for controlling and regulating the operating range of a control rod in an injection combustion engine Download PDF

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Publication number
EP0188404B1
EP0188404B1 EP86890007A EP86890007A EP0188404B1 EP 0188404 B1 EP0188404 B1 EP 0188404B1 EP 86890007 A EP86890007 A EP 86890007A EP 86890007 A EP86890007 A EP 86890007A EP 0188404 B1 EP0188404 B1 EP 0188404B1
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EP
European Patent Office
Prior art keywords
signal
microcomputer
actuator
indicating
switched
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EP86890007A
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German (de)
French (fr)
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EP0188404A3 (en
EP0188404A2 (en
Inventor
Artur Dr. Ing. Seibt
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Voestalpine Metal Forming GmbH
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Voestalpine Metal Forming GmbH
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Priority to AT86890007T priority Critical patent/ATE36582T1/en
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Publication of EP0188404A3 publication Critical patent/EP0188404A3/en
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    • 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
    • F02D41/28—Interface 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/042—Introducing corrections for particular operating conditions for stopping the engine

Definitions

  • the invention relates to an arrangement for controlling and regulating the adjustment path of the control rod of the fuel supply of an injection internal combustion engine in dependence on operating variables, such as. B. speed, boost pressure, accelerator position, etc., which are determined with the aid of sensors, the signal lines of the sensors are connected to the inputs of a microcomputer and connected to the output of the microcomputer via an actuator control, an actuator acting on the control rod, in particular a stepper motor is, as well as with a power supply part for the microcomputer, the actuator control and the like. More.
  • Motor vehicles with diesel engines do not have an ignition key in the conventional sense, but they do have a main switch, which can be used to switch other consumers on and off in addition to the electronic controller for injection. After switching off with the main switch, the controller should control the control rod via an actuator, for. B. a stepper motor in the zero position, so that the motor is turned off.
  • a main switch which can be used to switch other consumers on and off in addition to the electronic controller for injection. After switching off with the main switch, the controller should control the control rod via an actuator, for. B. a stepper motor in the zero position, so that the motor is turned off.
  • the electronic controller is in the main circuit, but this has the consequence that after switching off by means of the main switch, the actuator is de-energized, whereby the control rod remains somewhere in an undefined position. It was therefore necessary to provide a relay with a drop-out delay which, after being switched off with the main switch, supplies the controller with power for a while, so that there is enough time for the control rod to return to the zero position (approx. 1 sec.). With this arrangement, the cost of the additional relay is just as disadvantageous as the fact that this relay creates a possible source of error at a crucial point in the vehicle.
  • US-A-4 385 602 addresses the problem of idle control, in which a stepper motor, controlled by electronics, an idle actuator, e.g. B. a flap in an air bypass moves.
  • the electronics control the flap depending on the intake air volume, speed, cooling water temperature, closed position indicator of the main throttle valve etc.
  • the throttle valve After opening the ignition switch, the throttle valve is brought out of its last position into the zero position and then returned to a central position.
  • the stepper motor is stopped and the power supply is switched off.
  • the throttle valve is brought into the open position and can remain there, or is then subsequently brought into a somewhat more closed position in order to avoid excessive speed at the next start.
  • the control described is intended to prevent the idle throttle valve from remaining in the closed position after the engine has been switched off, since it could freeze in it and become immobile.
  • the engine is not switched off by the idle throttle valve but by the ignition switch. This is also evident from the explicit mention that the idle throttle valve can be brought into its fully open position after switching off by means of the ignition switch.
  • US-A-4 391 244 is to avoid the disadvantages of a vacuum and bimetallic controlled, conventional idle control.
  • the control of an idle throttle valve in an intake air bypass is carried out in the same way as in the previously discussed US Pat. No. 4,385,602 by the same applicant. After switching off the ignition switch, the idle valve should be brought into the fully open position.
  • stepper motor Since inertia problems occur with the rapidly moving stepper motor, the stepper motor is actuated with longer pulses after the ignition is switched off, so that it now moves the flap so slowly into the open position that it is even possible to stop in the open position.
  • the stepper motor is not provided with a feedback, but the number of steps prescribed for the stepper motor is stored in a memory.
  • the position of the stepper motor or throttle valve is inferred from the memory content, which presupposes that the stepper motor actually carries out the specified steps. Even a temporary jamming of the stepper motor or the parts driven by it leads to incorrect information.
  • a reset signal is emitted by a microcomputer which is intended to convert the stepper motor to a zero position more slowly than in normal operation.
  • Power is supplied via the manually operated main switch, to which a relay contact is connected in parallel. After opening the main switch, this relay contact initially remains closed and is opened first after the above-mentioned memory indicates that the stepper motor has reached its zero position.
  • the invention it is no longer necessary to take into account two times, namely the time which the control rod needs to come to its zero position and the drop-out delay time of the relay used previously. For example, if the relay delay for any reason, e.g. B. due to the aging of a capacitor was too low, the control rod got stuck in an undefined position. In contrast, the invention always ensures that the power supply for the controller part is only switched off when the actuator has actually reached the zero position.
  • a modification of the invention provides for an arrangement with a hydraulically, pneumatically or electrically actuated emergency shutdown device for zero throttling of the engine, in particular for interrupting the fuel supply, that the emergency shutdown device can be activated in the presence of a signal indicating the switch-off position of the engine main switch or an emergency signal that can be output by the microcomputer is and the microcomputer connected to the signal line of a speed sensor is set up in the presence of a signal indicating the zero speed of the motor for delivering the reset signal to the actuator control.
  • the control rod 2 by means of an electromechanical actuator 3, for. B. a stepper motor, operated and vary by the amount of fuel injected between the zero amount and a certain maximum amount (full throttle).
  • an emergency shutdown device 4 which also acts on the control rod 2.
  • This emergency stop device can work hydraulically, pneumatically or electromechanically; it immediately puts the control rod 2 in its zero position after its activation, regardless of the respective position of the actuator, whereby the fuel supply to the engine 1 is completely interrupted.
  • the emergency shutdown device is in the rest position as long as there is voltage on its control line and it is activated as soon as this voltage goes to zero. Activation at zero input voltage takes place for safety reasons, since the emergency shutdown device u. a. must take immediate action in the event of a power failure.
  • the emergency stop device does not necessarily have to act on the control rod. Rather, it is also known that the emergency shutdown device switches a two-way valve when activated, so that the fuel is no longer conveyed by the fuel pump to the injection pump or to the pump nozzles, but rather is extracted from there, which naturally also leads to the engine coming to a standstill.
  • An electronic controller 5 is provided for regulation, which essentially has a power supply part 6, a microcomputer 7 and an actuator control 8.
  • the signal line 1, various sensors, not shown, the z. B. the boost pressure, air pressure, accelerator pedal position, etc. are fed to the inputs of the microcomputer 7 as well as the signal line r of a feedback device 9 coupled to the actuator 3 and how the signal line n of a speed sensor 10 of the engine 1st
  • the arrangement is supplied with power via the motor vehicle battery 11 with the battery voltage U B , the power supply part 6 constantly being connected to the battery voltage via a line 12.
  • the battery 11 is connected via a motor main switch 13 to a main line 14 to which various consumers (not shown) can be connected.
  • a signal line d leads to an input x of the power supply part 6 and a signal line a to an input of the microcomputer 7.
  • the power supply part 6 has one or more output lines 15, via which individual circuit parts of the controller 5, e.g. B. the microcomputer 7 and the actuator control 8, are supplied with stabilized supply voltages.
  • the output voltage of the power supply unit can be switched on or off depending on the voltages at two control inputs x, y.
  • An output line c of the microcomputer leads to a second input y of the power supply part 6, a further output line leads to an input of an AND element 16 connected upstream of the emergency shutdown device 4 or its control line e, the second input of which is connected to the main line 14 via a signal line g, and an output leads via a signal line b to the input of the actuator control 8, which is connected to the actuator 3 via a line h.
  • the Mikrocom processes Computer 7 the signals and measured values supplied to it and acts accordingly via the actuator control 8 on the actuator 3, whereby the control rod 2 is adjusted.
  • the position of the actuator 3, for. B. the respective angular position of the axis of a stepper motor is reported to the microcomputer via the feedback 9.
  • the microcomputer 7 receives a signal s e , namely a zero signal, via the signal line a, whereupon it outputs a reset signal s b to the actuator control via the signal line b, so that the control rod 2 is subsequently used by means of the actuator 3 is brought into its zero position.
  • the zero position of the actuator 2 is reported via the signal line r to the microcomputer 7, which then outputs a switch-off signal Sc indicating the zero position of the actuator 3 to the second input y of the power supply part 6 via the signal line c, so that the latter supplies the voltages on its output line 15 switches off. This also interrupts the power supply to the microcomputer 7.
  • this arrangement ensures that the power supply to the controller 5 is only interrupted until the control rod is actually in its zero position. If the main motor switch 13 is switched on again, a switch-on signal s d reaches the control input x of the power supply part 6 via the signal line d, which now starts to work and supplies the controller 5, and thus also the microcomputer 7, with voltage. As requested, control rod 2 is in its zero position when switched on.
  • an emergency shutdown device 4 Since diesel engines turn up above the permissible maximum speed when certain critical operating conditions exist - until the engine is destroyed - care must be taken to ensure that the engine is throttled immediately in an emergency.
  • an emergency shutdown device 4 is provided, the principle operation of which has already been explained above. As long as there is voltage on the control line e of the emergency shutdown device 4, it remains in the idle position; when the voltage is lost, on the other hand, it is activated and, in the exemplary embodiment via the control rod 2, switches off the engine 1.
  • the engine 1 can in principle be shut down via the emergency shutdown, which is explained below and to which the invention relates.
  • control rod 2 In normal operation, the control rod 2 is actuated via the actuator 3, which is controlled by the microcomputer 7 via the control 8.
  • a zero signal reaches the AND gate 16 via the signal line g, so that the zero signal also occurs on the control line e and the emergency shutdown device 4 is activated.
  • the actuator 3 or the emergency stop device 4 are mechanically coupled to the control rod 2 so that the emergency stop, d. H. the control rod 2 can be reset to its zero position, regardless of the respective position of the actuator 3.
  • the standstill of the motor 1 is reported to the microcomputer 7 via the speed sensor 10 and a signal Sn on the signal line n (zero speed).
  • the microcomputer 7 is set up to output a reset signal s b via the signal line b to the actuator control 8 even when this signal is present.
  • the actuator 3 is also reset to its zero position, which is then reported to the microcomputer 7 by means of the feedback 9, whereupon — as already described above — the power supply part 6 is switched off and the controller 5 is de-energized.
  • the microcomputer 7 is set up in the presence of certain operating states, the z. B. could lead to a runaway of the engine, an emergency signal s f (zero signal) via the signal line f to the AND gate 16. If this occurs, the emergency shutdown takes place in the same way as described above in connection with the switch 13 being switched off.
  • the invention can be used not only in connection with motor vehicle engines, but very generally in motors, be it stationary motors or motors in land, air and water vehicles.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
  • High-Pressure Fuel Injection Pump Control (AREA)

Abstract

1. Arrangement for controlling and regulating the adjustment stroke of the control rod of the fuel supply of a fuel-injection internal-combustion engine as a function of operating values, such as rotational speed, boost pressure, accelerator position, etc., which are determined by measurement transducers, wherein the signal lines (Ii) of the transducers are connected to the inputs of a microcomputer (7), and an actuator (3), especially a stepping motor, acting on the control rod, is connected to the output of the microcomputer via an actuator drive (8), also with a power supply unit (6) for the microcomputer (7), the actuator drive (8) and so on, characterized by the fact that the microcomputer (7) is arranged to emit a reset signal (sb ) to the actuator drive (8) when a signal (sa ) indicating the off position of the main engine-switch (13) is present, that a response synchro (9) is allocated to the actuator (3) and is connected via a signal line (r) to one input of the microcomputer (7), which is set up to emit an output signal (sc ) indicating the zero position of the actuator (2), and that the battery voltage (Ub ) is continuously applied to the power supply unit (6), whose output voltage or output voltages can be switched on and off as a function of the voltages at two control inputs (x, y), wherein the output voltage or output voltages can be switched on at the first control input (x) when a signal (sd ) indicating the on position of the main engine-switch (13) is present, and can be switched off at the second control-input (y) when a signal (sc ) indicating the zero position of the actuator (3) is present.

Description

Die Erfindung bezieht sich auf eine Anordnung zum Steuern und Regeln des Verstellweges der Regelstange der Kraftstoffversorgung einer Einspritzbrennkraftmaschine in Abhängigkeit von Betriebsgrößen, wie z. B. Drehzahl, Ladedruck Gaspedalstellung etc., die mit Hilfe von Meßwertgebern ermittelt werden, wobei die Signalleitungen der Meßwertgeber mit den Eingängen eines Mikrocomputers verbunden sind und mit dem Ausgang des Mikrocomputers über eine Stellgliedansteuerung ein auf die Regelstange wirkendes Stellglied, insbesondere ein Schrittmotor, verbunden ist, sowie mit einem Stromversorgungsteil für den Mikrocomputer, die Stellgliedansteuerung und dgl. mehr.The invention relates to an arrangement for controlling and regulating the adjustment path of the control rod of the fuel supply of an injection internal combustion engine in dependence on operating variables, such as. B. speed, boost pressure, accelerator position, etc., which are determined with the aid of sensors, the signal lines of the sensors are connected to the inputs of a microcomputer and connected to the output of the microcomputer via an actuator control, an actuator acting on the control rod, in particular a stepper motor is, as well as with a power supply part for the microcomputer, the actuator control and the like. More.

Kraftfahrzeuge mit Dieselmotoren besitzen zwar keinen Zündschlüssel im herkömmlichen Sinn, jedoch einen Hauptschalter, mit dessen Hilfe außer dem elektronischen Regler für die Einspritzung auch andere Verbraucher ein- bzw. ausgeschaltet werden können. Nach Abschalten mit dem Hauptschalter soll der Regler die Regelstange über ein Stellglied, z. B. einen Schrittmotor, in die Null-Lage bringen, damit auf diese Weise der Motor abgestellt wird.Motor vehicles with diesel engines do not have an ignition key in the conventional sense, but they do have a main switch, which can be used to switch other consumers on and off in addition to the electronic controller for injection. After switching off with the main switch, the controller should control the control rod via an actuator, for. B. a stepper motor in the zero position, so that the motor is turned off.

Bei den bisher bekannten Anordnungen der eingangs genannten Art liegt der elektronische Regler in dem Hauptstromkreis, was jedoch zur Folge hat, daß nach Abschalten mittels des Hauptschalters das Stellglied stromlos wird, wodurch die Regelstange irgendwo, in einer undefinierten Stellung stehenbleibt. Daher war es erforderlich, ein Relais mit Abfallverzögerung vorzusehen, das nach Abschalten mit dem Hauptschalter den Regler noch eine zeitlang mit Strom versorgt, sodaß genügend Zeit für die Rückstellung der Regelstange in die Nullstellung bleibt (etwa 1 sec.). Bei dieser Anordnung sind die Kosten für das zusätzliche Relais ebenso nachteilig wie der Umstand, daß durch dieses Relais eine mögliche Fehlerquelle an einer entscheidenden Stelle des Fahrzeuges entsteht.In the previously known arrangements of the type mentioned, the electronic controller is in the main circuit, but this has the consequence that after switching off by means of the main switch, the actuator is de-energized, whereby the control rod remains somewhere in an undefined position. It was therefore necessary to provide a relay with a drop-out delay which, after being switched off with the main switch, supplies the controller with power for a while, so that there is enough time for the control rod to return to the zero position (approx. 1 sec.). With this arrangement, the cost of the additional relay is just as disadvantageous as the fact that this relay creates a possible source of error at a crucial point in the vehicle.

Die US-A-4 385 602 behandelt das Problem der Leerlaufregelung, wobei ein Schrittmotor, von einer Elektronik angesteuert, ein Leerlaufstellglied, z. B. eine Klappe in einem Luftbypass, bewegt.US-A-4 385 602 addresses the problem of idle control, in which a stepper motor, controlled by electronics, an idle actuator, e.g. B. a flap in an air bypass moves.

Die Elektronik steuert die Klappe in Abhängigkeit von Ansaugluftmenge, Drehzahl, Kühlwassertemperatur, Schließstellungsanzeige der Hauptdrosselklappe etc.The electronics control the flap depending on the intake air volume, speed, cooling water temperature, closed position indicator of the main throttle valve etc.

Nach Öffnen des Zündschalters wird die Drosselklappe aus ihrer letzten Stellung heraus in die Nullage gebracht und daraufhin wieder in eine Mittellage zurückgeführt.After opening the ignition switch, the throttle valve is brought out of its last position into the zero position and then returned to a central position.

In dieser Lage wird der Schrittmotor angehalten und die Stromversorgung abgeschaltet. Als zweite Möglichkeit wird erwähnt, daß die Drosselklappe in die Offenlage gebracht wird und dort bleiben kann, oder aber daraufhin in eine etwas geschlossenere Lage gebracht wird, um eine zu hohe Drehzahl beim nächsten Start zu vermeiden.In this position, the stepper motor is stopped and the power supply is switched off. As a second possibility, it is mentioned that the throttle valve is brought into the open position and can remain there, or is then subsequently brought into a somewhat more closed position in order to avoid excessive speed at the next start.

Die beschriebene Steuerung soll verhindern, daß die Leerlaufdrosselklappe nach dem Abstellen des Motors in der geschlossenen Lage bleibt, da sie in dieser vereisen und unbeweglich werden könnte.The control described is intended to prevent the idle throttle valve from remaining in the closed position after the engine has been switched off, since it could freeze in it and become immobile.

Der Motor wird jedoch nicht durch die Leerlaufdrosselklappe sondern durch den Zündschalter abgestellt. Das geht auch aus der ausdrücklichen Erwähnung hervor, daß die Leerlaufdrosselklappe nach Abschalten mittels des Zündschalters in ihre voll geöffnete Lage gebracht werden kann.However, the engine is not switched off by the idle throttle valve but by the ignition switch. This is also evident from the explicit mention that the idle throttle valve can be brought into its fully open position after switching off by means of the ignition switch.

Ein Rückmelder wird hier nicht verwendet, im Gegenteil ein solcher soll ausdrücklich vermieden werden (Spalte 4, Zeilen 55, 56). Das Anlaufen einer bestimmten Stellung der Leerlaufdrosselklappe erfolgt nur zeitabhängig, nicht jedoch in Abhängigkeit von einem Rückmeldesignal.A feedback is not used here, on the contrary, one should be explicitly avoided (column 4, lines 55, 56). The start of a certain position of the idle throttle valve is only time-dependent, but not dependent on a feedback signal.

Zielsetzung der US-A-4 391 244 ist es, die Nachteile einer vakuum- und bimetallgesteuerten, konventionellen Leerlaufregelung zu vermeiden. Die Ansteuerung einer Leerlaufdrosselklappe in einem Ansaugluftbypass erfolgt in gleicher Weise wie in der vorhin besprochenen US-4 385 602 desselben Anmelders. Es soll nach dem Abschalten durch den Zündschalter die Leerlaufklappe in die voll geöffnete Lage gebracht werden.The aim of US-A-4 391 244 is to avoid the disadvantages of a vacuum and bimetallic controlled, conventional idle control. The control of an idle throttle valve in an intake air bypass is carried out in the same way as in the previously discussed US Pat. No. 4,385,602 by the same applicant. After switching off the ignition switch, the idle valve should be brought into the fully open position.

Da mit dem sich rasch bewegenden Schrittmotor Trägheitsprobleme auftreten, wird nach dem Abschalten der Zündung der Schrittmotor mit längeren Impulsen angesteuert, damit er nun die Klappe so langsam in die Offenstellung bewegt, daß ein Anhalten in der Offenstellung überhaupt möglich ist.Since inertia problems occur with the rapidly moving stepper motor, the stepper motor is actuated with longer pulses after the ignition is switched off, so that it now moves the flap so slowly into the open position that it is even possible to stop in the open position.

Der Schrittmotor ist nicht mit einem Rückmelder versehen, sondern die Anzahl der dem Schrittmotor vorgeschriebenen Schritte wird in einem Speicher abgespeichert. Aus dem Speicherinhalt wird auf die Lage des Schrittmotors bzw. der Drosselklappe geschlossen, was voraussetzt, daß der Schrittmotor tatsächlich die vorgegebenen Schritte durchführt. Ein auch nur vorübergehendes Klemmen des Schrittmotors oder der von ihm angetriebenen Teile führt daher zu einer Fehlinformation.The stepper motor is not provided with a feedback, but the number of steps prescribed for the stepper motor is stored in a memory. The position of the stepper motor or throttle valve is inferred from the memory content, which presupposes that the stepper motor actually carries out the specified steps. Even a temporary jamming of the stepper motor or the parts driven by it leads to incorrect information.

Es wird jedoch, wie bei der vorliegenden Erfindung, bei Vorliegen eines die Ausschaltstellung des Motorhauptschalters anzeigenden Signales von einem Mikrocomputer ein Rückstellsignal abgegeben, das den Schrittmotor langsamer als im Normalbetrieb in eine Nullstellung überführen soll. Die Stromversorgung erfolgt über den manuell betätigbaren Hauptschalter, dem ein Relaiskontakt parallelgeschaltet ist. Nach Öffnen des Hauptschalters bleibt dieser Relaiskontakt zunächst geschlossen und wird erste geöffnet, nachdem der oben erwähnte Speicher anzeigt, daß der Schrittmotor seine Nullage erreicht hat.However, as in the present invention, when a signal indicating the switch-off position of the motor main switch is present, a reset signal is emitted by a microcomputer which is intended to convert the stepper motor to a zero position more slowly than in normal operation. Power is supplied via the manually operated main switch, to which a relay contact is connected in parallel. After opening the main switch, this relay contact initially remains closed and is opened first after the above-mentioned memory indicates that the stepper motor has reached its zero position.

Es ist ein Ziel der Erfindung, eine Anordnung zu schaffen, die nach Abschalten des Hauptschalters das Rückstellen des Stellgliedes nicht nur ermöglicht, sondern unter allen Umständen sicherstellt.It is an object of the invention to provide an arrangement which, after the main switch has been switched off, not only enables the actuator to be reset, but also ensures under all circumstances.

Dieses Ziel läßt sich mit einer Anordnung der eingangs genannten Art erreichen, bei welcher die Merkmale des Patentanspruches 1 realisiert sind.This goal can be achieved with an arrangement of achieve the type mentioned, in which the features of claim 1 are realized.

Dank der Erfindung ist es nicht mehr erforderlich, zwei Zeiten zu berücksichtigen, nämlich jene Zeit, welche die Regelstange benötigt, um in ihre Null-Lage zu kommen und die Abfallverzögerungszeit des bisher verwendeten Relais. Wenn etwa die Relaisverzögerung aus irgendeinem Grund, z. B. wegen der Alterung eines Kondensators, zu gering war, so blieb die Regelstange in einer undefinierten Lage stecken. Demgegenüber ist durch die Erfindung immer gewährleistet, daß die Stromversorgung für den Reglerteil erst dann abgeschaltet wird, wenn das Stellglied tatsächlich die Null-Lage erreicht hat.Thanks to the invention, it is no longer necessary to take into account two times, namely the time which the control rod needs to come to its zero position and the drop-out delay time of the relay used previously. For example, if the relay delay for any reason, e.g. B. due to the aging of a capacitor was too low, the control rod got stuck in an undefined position. In contrast, the invention always ensures that the power supply for the controller part is only switched off when the actuator has actually reached the zero position.

Auf Grund der Motorcharakteristik wird bei Dieselmotoren eine Notabstellvorrichtung benötigt, die bei Auftreten irregulärer Betriebszustände ein sofortiges Herunterregeln des Motors über die Regelstange ermöglicht. Daher sieht eine Modifikation der Erfindung bei einer Anordnung mit einer hydraulisch, pneumatisch oder elektrisch betätigbaren Notabstellvorrichtung zur Nulldrosselung des Motors, insbesondere zur Unterbrechnung der Kraftstoffzufuhr vor, daß die Notabstellvorrichtung bei Vorliegen eines die Ausschaltstellung des Motorhauptschalters anzeigenden Signals oder eines von dem Mikrocomputer abgebbaren Notsignals aktivierbar ist und der mit der Signalleitung eines Drehzahlgebers verbundene Mikrocomputer bei Vorliegen eines die Null-Drehzahl des Motors anzeigenden Signals zur Abgabe des Rückstellungssignals an die Stellgliedansteuerung eingerichtet ist.Due to the engine characteristics, an emergency shutdown device is required for diesel engines, which enables the engine to be reduced immediately via the control rod if irregular operating conditions occur. Therefore, a modification of the invention provides for an arrangement with a hydraulically, pneumatically or electrically actuated emergency shutdown device for zero throttling of the engine, in particular for interrupting the fuel supply, that the emergency shutdown device can be activated in the presence of a signal indicating the switch-off position of the engine main switch or an emergency signal that can be output by the microcomputer is and the microcomputer connected to the signal line of a speed sensor is set up in the presence of a signal indicating the zero speed of the motor for delivering the reset signal to the actuator control.

Auf diese Weise ist gewährleistet, daß die Stromversorgung für den Reglerteil abgeschaltet wird, wenn die Regelstange und das Stellglied in ihre Null-Lagen gebracht sind, unabhängig davon, ob dies zuerst über die Notabstellvorrichtung oder auf anderem Weg erfolgt.In this way it is ensured that the power supply for the controller part is switched off when the control rod and the actuator are brought into their zero positions, regardless of whether this is done first via the emergency shutdown device or in another way.

Die Erfindung samt ihren weiteren Vorteilen ist im folgenden an Hand eines Ausführungsbeispiels näher erläutert, das in der Zeichnung veranschaulicht ist. Diese zeigt eine erfindungsgemäße Anordnung in einem Blockschaltbild.The invention and its further advantages are explained in more detail below using an exemplary embodiment which is illustrated in the drawing. This shows an arrangement according to the invention in a block diagram.

Wie aus dem Blockschaltbild ersichtlich, weist ein Motor 1, z. B. ein Dieselmotor, eine Regelstange 2 auf, welche zur Steuerung der Einspritzpumpe oder der Pumpedüsen des Motors dient. Im normalen Betrieb kann die Regelstange 2 mittels eines elektromechanischen Stellgliedes 3, z. B. eines Schrittmotors, betätigt und hiedurch die eingespritzte Kraftstoffmenge zwischen der Nullmenge und einer bestimmten Höchstmenge (Vollgas) variieren.As can be seen from the block diagram, a motor 1, z. B. a diesel engine, a control rod 2, which serves to control the injection pump or the pump nozzles of the engine. In normal operation, the control rod 2 by means of an electromechanical actuator 3, for. B. a stepper motor, operated and vary by the amount of fuel injected between the zero amount and a certain maximum amount (full throttle).

Weiters ist eine Notabstellvorrichtung 4 vorgesehen, die gleichfalls an der Regelstange 2 angreift. Diese Notabstellvorrichtung kann hydraulisch, pneumatisch oder elektromechanisch arbeiten ; sie stellt nach ihrer Aktivierung unverzüglich die Regelstange 2 in deren Null-Lage, und zwar unabhängig von der jeweiligen Position des Stellgliedes, wodurch die Treibstoffzufuhr zum Motor 1 völlig unterbrochen wird.Furthermore, an emergency shutdown device 4 is provided, which also acts on the control rod 2. This emergency stop device can work hydraulically, pneumatically or electromechanically; it immediately puts the control rod 2 in its zero position after its activation, regardless of the respective position of the actuator, whereby the fuel supply to the engine 1 is completely interrupted.

Die Notabstellvorrichtung befindet sich in Ruhestellung, solange an ihrer Steuerleitung e Spannung liegt und sie wird aktiviert, sobald diese Spannung auf Null geht. Die Aktivierung bei der Eingangsspannung Null erfolgt aus Sicherheitsgründen, da die Notabstellvorrichtung u. a. bei Stromausfall sofort in Tätigkeit treten muß.The emergency shutdown device is in the rest position as long as there is voltage on its control line and it is activated as soon as this voltage goes to zero. Activation at zero input voltage takes place for safety reasons, since the emergency shutdown device u. a. must take immediate action in the event of a power failure.

Es sei erwähnt, daß die Notabstellvorrichtung nicht notwendigerweise auf die Regelstange wirken muß. Vielmehr ist es auch bekannt, daß die Notabstellvorrichtung bei Aktivierung ein Zweiwegventil umschaltet, wodurch der Kraftstoff durch die Kraftstoffpumpe nicht mehr zu der Einspritzpumpe bzw. zu den Pumpedüsen gefördert sondern vielmehr von dort abgesaugt wird, was natürlich gleichfalls zum Stillstand des Motors führt.It should be mentioned that the emergency stop device does not necessarily have to act on the control rod. Rather, it is also known that the emergency shutdown device switches a two-way valve when activated, so that the fuel is no longer conveyed by the fuel pump to the injection pump or to the pump nozzles, but rather is extracted from there, which naturally also leads to the engine coming to a standstill.

Zur Regelung ist ein elektronischer Regler 5 vorgesehen, der im wesentlichen einen Stromversorgungsteil 6, einen Mikrocomputer 7 und eine Stellgliedansteuerung 8 aufweist.An electronic controller 5 is provided for regulation, which essentially has a power supply part 6, a microcomputer 7 and an actuator control 8.

Die Signalleitung 1, verschiedener, nicht dargestellter Meßwertgeber, die z. B. den Ladedruck, den Luftdruck, die Gaspedalstellung etc. erfassen, sind den Eingängen des Mikrocomputers 7 ebenso zugeführt, wie die Signalleitung r eines mit dem Stellglied 3 gekoppelten Rückmelders 9 und wie die Signalleitung n eines Drehzahlgebers 10 des Motors 1.The signal line 1, various sensors, not shown, the z. B. the boost pressure, air pressure, accelerator pedal position, etc. are fed to the inputs of the microcomputer 7 as well as the signal line r of a feedback device 9 coupled to the actuator 3 and how the signal line n of a speed sensor 10 of the engine 1st

Die Stromversorgung der Anordnung erfolgt über die Kraftfahrzeugbatterie 11 mit der Batteriespannung UB, wobei der Stromversorgungsteil 6 über eine Leitung 12 ständig an der Batteriespannung liegt. Die Batterie 11 ist über einen Motorhauptschalter 13 mit einer Hauptleitung 14 verbunden, an die verschiedene, nicht gezeigte Verbraucher angeschlossen sein können.The arrangement is supplied with power via the motor vehicle battery 11 with the battery voltage U B , the power supply part 6 constantly being connected to the battery voltage via a line 12. The battery 11 is connected via a motor main switch 13 to a main line 14 to which various consumers (not shown) can be connected.

Von der Hauptleitung 14 führt eine Signalleitung d zu einem Eingang x des Stromversorgungsteils 6 und eine Signalleitung a zu einem Eingang des Mikrocomputers 7. Der Stromversorgungsteil 6 besitzt eine oder mehrere Ausgangsleitungen 15, über die einzelne Schaltungsteile des Reglers 5, z. B. der Mikrocomputer 7 und die Stellgliedansteuerung 8, mit stabilisierten Speisespannungen versorgt werden. Die Ausgangsspannung des Stromversorgungsteils kann in Abhängigkeit von den Spannungen an zwei Steuereingängen x, y ein- bzw. ausgeschaltet werden. Eine Ausgangsleitung c des Mikrocomputers führt zu einem zweiten Eingang y des Stromversorgungsteils 6, eine weitere Ausgangsleitung zu einem Eingang eines der Notabstellvorrichtung 4 bzw. deren Steuerleitung e vorgeschalteten UND-Gliedes 16, dessen zweiter Eingang über eine Signalleitung g mit der Hauptleitung 14 verbunden ist, und ein Ausgang führt über eine Signalleitung b zu dem Eingang der Stellgliedansteuerung 8, die über eine Leitung h mit dem Stellglied 3 verbunden ist.From the main line 14, a signal line d leads to an input x of the power supply part 6 and a signal line a to an input of the microcomputer 7. The power supply part 6 has one or more output lines 15, via which individual circuit parts of the controller 5, e.g. B. the microcomputer 7 and the actuator control 8, are supplied with stabilized supply voltages. The output voltage of the power supply unit can be switched on or off depending on the voltages at two control inputs x, y. An output line c of the microcomputer leads to a second input y of the power supply part 6, a further output line leads to an input of an AND element 16 connected upstream of the emergency shutdown device 4 or its control line e, the second input of which is connected to the main line 14 via a signal line g, and an output leads via a signal line b to the input of the actuator control 8, which is connected to the actuator 3 via a line h.

Die Funktion der erfindungsgemäßen Anordnung sowie weitere Schaltungsmerkmale werden zunächst unter Außerachtlassung der Notabstellvorrichtung beschrieben.The function of the arrangement according to the invention and further circuit features will first be described with the emergency shutdown device disregarded.

Im normalen Betrieb verarbeitet der Mikrocomputer 7 die ihm zugeführten Signale und Meßwerte und wirkt dementsprechend über die Stellgliedansteuerung 8 auf das Stellglied 3, wodurch die Regelstange 2 verstellt wird. Die Lage des Stellgliedes 3, z. B. die jeweilige Winkellage der Achse eines Schrittmotors, wird über den Rückmelder 9 dem Mikrocomputer gemeldet.In normal operation, the Mikrocom processes Computer 7 the signals and measured values supplied to it and acts accordingly via the actuator control 8 on the actuator 3, whereby the control rod 2 is adjusted. The position of the actuator 3, for. B. the respective angular position of the axis of a stepper motor is reported to the microcomputer via the feedback 9.

Wird der Motorhauptschalter 13 ausgeschaltet, so erhält der Mikrocomputer 7 über die Signalleitung a ein Signal se, nämlich ein Nullsignal, worauf er über die Signalleitung b ein Rückstellsignal sb an die Stellgliedansteuerung abgibt, sodaß in der Folge mittels des Stellgliedes 3 die Regelstange 2 in ihre Null-Lage gebracht wird. Die Null-Lage des Stellgliedes 2 wird über die Signalleitung r dem Mikrocomputer 7 gemeldet, der daraufhin über die Signalleitung c ein die Nullage des Stellgliedes 3 anzeigendes Ausschaltsignal Sc an den zweiten Eingang y des Stromversorgungsteils 6 abgibt, sodaß dieser die Spannungen an seiner Ausgangsleitung 15 abschaltet. Hiedurch wird auch die Stromversorgung des Mikrocomputers 7 unterbrochen.If the main engine switch 13 is switched off, the microcomputer 7 receives a signal s e , namely a zero signal, via the signal line a, whereupon it outputs a reset signal s b to the actuator control via the signal line b, so that the control rod 2 is subsequently used by means of the actuator 3 is brought into its zero position. The zero position of the actuator 2 is reported via the signal line r to the microcomputer 7, which then outputs a switch-off signal Sc indicating the zero position of the actuator 3 to the second input y of the power supply part 6 via the signal line c, so that the latter supplies the voltages on its output line 15 switches off. This also interrupts the power supply to the microcomputer 7.

Wie leicht ersichtlich, ist durch diese Anordnung gewährleistet, daß die Stromversorgung des Reglers 5 erst dann unterbrochen wird, bis sich die Regelstange tatsächlich in ihrer Null-Lage befindet. Wird der Motorhauptschalter 13 neuerlich eingeschaltet, so gelangt über die Signalleitung d ein Einschaltsignal sd an den Steuereingang x des Stromversorgungsteils 6, der nun zu arbeiten beginnt und den Regler 5, somit auch den Mikrocomputer 7 mit Spannung versorgt. Wie gefordert, befindet sich beim Einschalten die Regelstange 2 in ihrer Null-Lage.As can easily be seen, this arrangement ensures that the power supply to the controller 5 is only interrupted until the control rod is actually in its zero position. If the main motor switch 13 is switched on again, a switch-on signal s d reaches the control input x of the power supply part 6 via the signal line d, which now starts to work and supplies the controller 5, and thus also the microcomputer 7, with voltage. As requested, control rod 2 is in its zero position when switched on.

Im weiteren wird die Erfindung im Zusammenhang mit der Verwendung einer Notabstellvorrichtung 4 beschrieben. Da Dieselmotoren bei Vorliegen gewisser kritischer Betriebszustände über die zulässige Höchstdrehzahl hochdrehen - und zwar bis zur Zerstörung des Motors - muß dafür Sorge getragen werden, daß im Notfall eine sofortige Drosselung des Motors erfolgt. Hiezu ist eine Notabstellvorrichtung 4 vorgesehen, deren prinzipielle Wirkungsweise bereits weiter oben erläutert wurde. Solange an der Steuerleitung e der Notabstellvorrichtung 4 Spannung liegt, bleibt diese in Ruhelage, bei Wegfall der Spannung wird sie hingegen aktiviert und stellt - im Ausführungsbeispiel über die Regelstange 2 - den Motor 1 ab.The invention is described below in connection with the use of an emergency stop device 4. Since diesel engines turn up above the permissible maximum speed when certain critical operating conditions exist - until the engine is destroyed - care must be taken to ensure that the engine is throttled immediately in an emergency. For this purpose, an emergency shutdown device 4 is provided, the principle operation of which has already been explained above. As long as there is voltage on the control line e of the emergency shutdown device 4, it remains in the idle position; when the voltage is lost, on the other hand, it is activated and, in the exemplary embodiment via the control rod 2, switches off the engine 1.

Um jederzeig eine Kontrolle über die Funktionsfähigkeit der Notabstellvorrichtung zu erhalten, kann das Abstellen des Motors 1 prinzipiell über die Notabstellung erfolgen, was im folgenden erläutert wird und worauf die Erfindung bezug nimmt.In order to obtain control over the functionality of the emergency shutdown device at all times, the engine 1 can in principle be shut down via the emergency shutdown, which is explained below and to which the invention relates.

Im normalen Betrieb erfolgt die Betätigung der Regelstange 2 über das Stellglied 3, das von dem Mikrocomputer 7 über die Ansteuerung 8 gesteuert wird. Bei Abschalten mittels des Schalters 13 gelangt ein Null-Signal über die Signalleitung g an das UND-Glied 16, sodaß auch an der Steuerleitung e das Null-Signal auftritt und die Notabstellvorrichtung 4 aktiviert wird. Diese greift nun an der Regelstange 2 an und stellt sie in ihre Null-Lage, sodaß die Kraftstoffzufuhr zum Motor völlig unterbrochen wird. Das Stellglied 3 bzw. die Notabstellvorrichtung 4 sind mechanisch so mit der Regelstange 2 gekuppelt, daß die Notabstellung, d. h. die Rückstellung der Regelstange 2 in ihre Null-Lage, unabhängig von der jeweiligen Stellung des Stellgliedes 3 erfolgen kann.In normal operation, the control rod 2 is actuated via the actuator 3, which is controlled by the microcomputer 7 via the control 8. When switched off by means of the switch 13, a zero signal reaches the AND gate 16 via the signal line g, so that the zero signal also occurs on the control line e and the emergency shutdown device 4 is activated. This now engages the control rod 2 and puts it in its zero position, so that the fuel supply to the engine is completely interrupted. The actuator 3 or the emergency stop device 4 are mechanically coupled to the control rod 2 so that the emergency stop, d. H. the control rod 2 can be reset to its zero position, regardless of the respective position of the actuator 3.

Der Stillstand des Motors 1 wird über den Drehzahlgeber 10 und ein Signal Sn auf der Signalleitung n an den Mikrocomputer 7 gemeldet (Null-Drehzahl). Der Mikrocomputer 7 ist dazu eingerichtet, auch bei Vorliegen dieses Signals ein Rückstellungssignal sb über die Signalleitung b an die Stellgliedansteuerung 8 abzugeben. Daraufhin erfolgt auch die Rückstellung des Stellgliedes 3 in seine Null-Lage, die daraufhin mittels des Rückmelders 9 dem Mikrocomputer 7 gemeldet wird, worauf - wie bereits oben beschrieben - das Abschalten des Stromversorgungsteils 6 erfolgt und der Regler 5 stromlos wird.The standstill of the motor 1 is reported to the microcomputer 7 via the speed sensor 10 and a signal Sn on the signal line n (zero speed). The microcomputer 7 is set up to output a reset signal s b via the signal line b to the actuator control 8 even when this signal is present. Thereupon, the actuator 3 is also reset to its zero position, which is then reported to the microcomputer 7 by means of the feedback 9, whereupon — as already described above — the power supply part 6 is switched off and the controller 5 is de-energized.

Der Mikrocomputer 7 ist dazu eingerichtet, bei Vorliegen gewisser Betriebszustände, die z. B. zu einem Durchgehen des Motors führen könnten, ein Notsignal sf (Null-Signal) über die Signalleitung f an das UND-Glied 16 abzugeben. Tritt dieser Fall ein, so erfolgt die Notabstellung in gleicher Weise wie zuvor im Zusammenhang mit dem Ausschalten des Schalters 13 beschrieben.The microcomputer 7 is set up in the presence of certain operating states, the z. B. could lead to a runaway of the engine, an emergency signal s f (zero signal) via the signal line f to the AND gate 16. If this occurs, the emergency shutdown takes place in the same way as described above in connection with the switch 13 being switched off.

Es versteht sich, daß die Erfindung nicht nur im Zusammenhang mit Kraftfahrzeug-Motoren Anwendung finden kann, sondern ganz allgemein bei Motoren, seien es Stationärmotoren oder Motoren in Land-, Luft- und Wasserfahrzeugen.It is understood that the invention can be used not only in connection with motor vehicle engines, but very generally in motors, be it stationary motors or motors in land, air and water vehicles.

Claims (2)

1. Arrangement for controlling and regulating the adjustment stroke of the control rod of the fuel supply of a fuel-injection internal-combustion engine as a function of operating values, such as rotational speed, boost pressure, accelerator position, etc., which are determined by measurement transducers, wherein the signal lines (li) of the transducers are connected to the inputs of a microcomputer (7), and an actuator (3), especially a stepping motor, acting on the control rod, is connected to the output of the microcomputer via an actuator drive (8), also with a power supply unit (6) for the microcomputer (7), the actuator drive (8) and so on, characterized by the fact that the microcomputer (7) is arranged to emit a reset signal (Sb) to the actuator drive (8) when a signal (sJ indicating the off position of the main engine-switch (13) is present, that a response synchro (9) is allocated to the actuator (3) and is connected via a signal line (r) to one input of the microcomputer (7), which is set up to emit an output signal (sc) indicating the zero position of the actuator (2), and that the battery voltage (Ub) is continuously applied to the power supply unit (6), whose output voltage or output voltages can be switched on and off as a function of the voltages at two control inputs (x, y), wherein the output voltage or output voltages can be switched on at the first controlinput (x) when a signal (Sd) indicating the on position of the main engine-switch (13) is present, and can be switched off at the second control-input (y) when a signal (sc) indicating the zero position of the actuator (3) is present.
2. Arrangement as in Claim 1, with a hydraulically, pneumatically or electrically-operated shut-off device for throttling-back the engine in an emergency, especially for interrupting the fuel supply, characterised by the fact that the emergency shut-off device (4) can be actuated when a signal (g) indicating the off position of the main engine-switch (13) or an emergency signal (sf) emitted by the microcomputer (7) is present, and the microcomputer (7) connected to the signal line of a rotary-speed transmitter (9) is set up to transmit a reset signal (Sb) to the actuator drive (8) when a signal (sn) indicating the zero rotational speed of the engine (1) is present.
EP86890007A 1985-01-18 1986-01-13 Device for controlling and regulating the operating range of a control rod in an injection combustion engine Expired EP0188404B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86890007T ATE36582T1 (en) 1985-01-18 1986-01-13 ARRANGEMENT FOR CONTROLLING AND REGULATING THE ADJUSTMENT TRAVEL OF THE CONTROL ROD OF AN INJECTION ENGINE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853501588 DE3501588A1 (en) 1985-01-18 1985-01-18 ARRANGEMENT FOR CONTROLLING AND ADJUSTING THE ADJUSTMENT OF THE CONTROL ROD OF AN INJECTION INTERNAL COMBUSTION ENGINE
DE3501588 1985-01-18

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EP0188404A2 EP0188404A2 (en) 1986-07-23
EP0188404A3 EP0188404A3 (en) 1987-04-15
EP0188404B1 true EP0188404B1 (en) 1988-08-17

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EP86890007A Expired EP0188404B1 (en) 1985-01-18 1986-01-13 Device for controlling and regulating the operating range of a control rod in an injection combustion engine

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AT (1) ATE36582T1 (en)
DE (2) DE3501588A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3802770A1 (en) * 1988-01-30 1989-08-10 Bosch Gmbh Robert SAFETY SYSTEM FOR INTERNAL COMBUSTION ENGINES
US5072702A (en) * 1989-06-29 1991-12-17 Fuji Jukogyo Kabushiki Kaisha Engine shut-down device
DE3928800A1 (en) * 1989-08-31 1991-03-07 Kloeckner Humboldt Deutz Ag Automatic control for limiting output of IC engine - has electronic control of injector pump setting with variable limits set by observation of engine parameters over prior operating period

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4136657A (en) * 1976-10-21 1979-01-30 Nippondenso Co., Ltd. Electric control system for diesel engine
JPS5535130A (en) * 1978-09-04 1980-03-12 Hitachi Ltd Injection amount control system for fuel injection pump in diesel engine
DE3007662A1 (en) * 1980-02-29 1981-09-10 Daimler-Benz Ag, 7000 Stuttgart ELECTRONIC CONTROL
JPS5726238A (en) * 1980-07-25 1982-02-12 Toyota Motor Corp Idle rate of revolution controller
JPS57210139A (en) * 1981-06-22 1982-12-23 Toyota Motor Corp Control method of idling speed in internal combustion engine
DE3322240A1 (en) * 1982-07-23 1984-01-26 Robert Bosch Gmbh, 7000 Stuttgart SAFETY EMERGENCY DEVICE FOR THE IDLE OPERATION OF MOTOR VEHICLES

Also Published As

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DE3501588A1 (en) 1986-07-24
EP0188404A3 (en) 1987-04-15
DE3660563D1 (en) 1988-09-22
EP0188404A2 (en) 1986-07-23
ATE36582T1 (en) 1988-09-15

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