Internal-combustion engines – Engine speed regulator – Open loop condition responsive
Patent
1991-05-21
1992-09-29
Argenbright, Tony M.
Internal-combustion engines
Engine speed regulator
Open loop condition responsive
731181, 123198D, 123479, F02D 1110, F02D 4122, B60Q 144
Patent
active
051506815
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a supervisory system for monitoring the accelerator pedal travel transducer in an electronic control system for a combustion engine
BACKGROUND OF THE INVENTION
An electronic control system to which the invention may be applied is described in an article entitled "Elektronische Motorsteuerung fuer Kraftfahrzeuge" published in "MTZ" Motortechnische Zeitschrift, year 46, Vol. 4, 1985, published by Franckh'sche Verlagshandlung Stuttgart. In this article, it is explained that electronic engine control (called "EMS" for short) means a system in which the conventional mechanical linkage between the accelerator pedal and the element (the throttle valve in a petrol engine or the regulating rod in a diesel injection pump) determining the engine output is replaced by an electrical connection comprising a pedal travel transducer (potentiometer) actuated by the accelerator pedal and an actuator (servomotor) actuating the said element.
The above article describes in particular a system (now sometimes called "E-gas") in which the servomotor adjusts the throttle valve in carburetor or petrol injection engine. U.S. Pat. Nos. 4,515,125 and 4,509,480 describe supervisory systems of the initially recited kind which are used for electronic diesel control (EDC). The two patent specifications disclose the use of a separate switch for detecting whether or not the accelerator pedal is in its idling position. The EDC performs a "signal-range check" to monitor the occurrence of faults in the operation of the system. Amongst other parameters, the accelerator pedal position is monitored and, for the purpose of the signal-range check, a separate idling switch, actuated when the accelerator pedal is in its idling position, may be used rather than the pedal travel transducer. The purpose of carrying out the signal-range check on the accelerator pedal position is to ensure that appropriate measures are taken by the EDC to prevent too large an injected fuel quantity if a fault should occur in the pedal travel transducer whereby the latter gives a signal corresponding to a substantially greater injectd fuel quantity than is desired by the driver.
Disadvantages of the supervisory systems described in U.S. Pat. Nos. 4,515,125 and 4,509,480 are that they cannot respond to all fault conditions and cannot pinpoint faults when they occur, for example, in the accelerator travel transducer.
SUMMARY OF THE INVENTION
The invention also relates to a supervisory system for monitoring accelerator pedal travel transducers in an electronic control system for a combustion engine. The system has an idling switch which detects the idling position of the accelerator pedal, in which the actual output signal (U-FFG) from the pedal travel transducer is interpreted and is compared with an output signal to be expected when the accelerator pedal is at or close to the idling position. A fault indication is produced when the information obtained from this comparison contradicts the pedal position information derived from the idling switch.
Such a system is briefly described in EP-A-0109478. However, such a system lacks reliability in that it does not necessarily fail safe. Should one of the connections to the idling switch be broken, this may not show up and the supervisory system can then not respond to a sticking travel tranducer.
The invention furthermore relates to a supervisory system for the accelerator pedal travel transducer in an electronic control system for a combustion engine installed in a vehicle. The system has an idling switch, which detects the idling position of the accelerator pedal, and a brake switch responsive to actuation of the vehicle brakes.
Such a system is described in U.S. Pat. No. 4,791,900. In
this system the brake switch, which may be the stoplight switch, is used as a redundant switch for producing a brake signal (BS) which is used to monitor the operation of the idling switch associated with the accelerator pedal. Operation of the brake normally implies that the driver has releas
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"Elektronische Motorsteuerung fur Kraftfahrzeuge" by Gerhard Kolberg in MTZ Motortechnische Zeitschrift, 46, vol. 4, (May 1985), pp. 129-133.
Berger Joachim
Bleuel Klaus
Gerstung Ulrich
Kull Hermann
Argenbright Tony M.
Ottesen Walter
Robert & Bosch GmbH
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