skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Failsafe engine fuel control system

Abstract

An engine fuel control system is described comprising: sensor means for providing separate more than two state electrical signals; fuel control means for receiving at least a primary control signal and providing a calculated engine fuel control signal as a function thereof; sensor signal conditioning circuit means coupled to the sensor means for receiving at least one of the electrical signals representative of sensed engine throttle position and sensed engine manifold pressure and providing; wherein the improvement comprises, failure detection means, for determining when the engine manifold pressure sensor signal is non-representative of actual engine manifold pressure and for providing a pressure sensor failure signal in response thereto. The sensor signal conditioning circuit means normally effectively provides a signal having magnitudes determined by at least the sensed manifold pressure signal to the fuel control means as the primary control signal in response to the absence of the pressure sensor failure signal. The system including an operator warning device which is activated in response to the pressure sensor failure signal indicating a failure of the pressure sensor.

Inventors:
;
Publication Date:
OSTI Identifier:
5802629
Patent Number(s):
US 4704685
Assignee:
Motorola, Inc., Schaumburg, IL NOV; NOV-88-090425; EDB-88-027566
Resource Type:
Patent
Resource Relation:
Patent File Date: Filed date 18 Jan 1985
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; FUEL INJECTION SYSTEMS; CONTROL SYSTEMS; COUNTING TECHNIQUES; DESIGN; ELECTRONIC CIRCUITS; INTERNAL COMBUSTION ENGINES; MONITORS; PRESSURE MEASUREMENT; SIGNAL CONDITIONERS; SIGNAL CONDITIONING; ENGINES; FUEL SYSTEMS; HEAT ENGINES; MEASURING INSTRUMENTS; PULSE CIRCUITS; 330100* - Internal Combustion Engines

Citation Formats

Martinsons, R., and Deutch, R.W. Failsafe engine fuel control system. United States: N. p., 1987. Web.
Martinsons, R., & Deutch, R.W. Failsafe engine fuel control system. United States.
Martinsons, R., and Deutch, R.W. 1987. "Failsafe engine fuel control system". United States. doi:.
@article{osti_5802629,
title = {Failsafe engine fuel control system},
author = {Martinsons, R. and Deutch, R.W.},
abstractNote = {An engine fuel control system is described comprising: sensor means for providing separate more than two state electrical signals; fuel control means for receiving at least a primary control signal and providing a calculated engine fuel control signal as a function thereof; sensor signal conditioning circuit means coupled to the sensor means for receiving at least one of the electrical signals representative of sensed engine throttle position and sensed engine manifold pressure and providing; wherein the improvement comprises, failure detection means, for determining when the engine manifold pressure sensor signal is non-representative of actual engine manifold pressure and for providing a pressure sensor failure signal in response thereto. The sensor signal conditioning circuit means normally effectively provides a signal having magnitudes determined by at least the sensed manifold pressure signal to the fuel control means as the primary control signal in response to the absence of the pressure sensor failure signal. The system including an operator warning device which is activated in response to the pressure sensor failure signal indicating a failure of the pressure sensor.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1987,
month =
}
  • A fail safe device is disclosed, comprising means for detecting a failure in an air/fuel ratio feedback control system and generating a fault signal when such failure is detected, and means responsive to the fault signal to drive an actuator for driving an air/fuel ratio control valve and also responsive to a reference position signal supplied thereto during the above driving, which is generated when the actuator passes its reference position, to stop the actuator at the reference position. The actuator driving/stopping means may comprise means for repeatedly driving the actuator over a predetermined operating range inclusive of the referencemore » position a plurality of times when it is not supplied with the reference position signal upon the actuator passing the reference position, and means for driving the actuator from its extreme operating position to a predetermined position and holding the same there when it is not supplied with the reference position signal even after a predetermined number of times of the above repeated driving of the actuator.« less
  • This patent describes an air-fuel ratio control system for an internal combustion engine. The system operates to shift the air-fuel ratio to a rich side with respect to a stoichiometric value when an engine load is high. The system includes an oxygen sensor provided in an exhaust system of the engine, a comparing means for comparing a level of an output signal of the oxygen sensor with a first reference level corresponding to the stoichiometric value of the air-fuel ratio, and an air-fuel ratio control means for controlling an air-fuel ratio of a mixture to be supplied to the enginemore » in accordance with a result of a comparison process of the comparing means. The improvement described here comprises a detection means for detecting a high load operation of the engine, and the comparing means comparing the level of the output signal of the oxygen sensor with a second reference level corresponding to an air-fuel ratio value on the leaner side of the stoichiometric value.« less
  • A fuel injection control system for an internal combustion engine comprising: a plurality of fuel injection valves for injecting fuel to respectively engine cylinders; a first sensor means for monitoring engine load to produce a first sensor signal indicative thereof; a second sensor means for monitoring crank shaft angular position for producing a second sensor signal; a third means for monitoring engine speed to produce an engine speed indicative data; and a control unit for controlling operation of each of the fuel injection valves to perform controlled amount of fuel injection at first and second injection timings in one enginemore » revolution cycle.« less
  • This patent describes a fuel injection control system for an internal combustion engine comprising: a first sensor producing a first sensor signal representative of the angular position of the crank shaft; a second sensor producing a second sensor signal representative of preselected engine operating parameters; a third sensor detecting whether engine operating conditions satisfy a predetermined fuel cut-off condition and if so, producing a third sensor signal; fourth means for deriving a fuel injection amount on the basis of a value of the second sensor signal and producing a fuel injection control signal having a value indicative of the derivedmore » fuel injection amount; fifth means for disabling the fourth means in the presence of the third sensor signal and for resumption operation of the fourth means after the third sensor signal ends, sixth means for deriving fuel injection timing and producing an injection timing control signal, wherein the first sensor signal includes a first pulse train representative of predetermined angular positions of the crank shaft and a second pulse train representative of predetermined units of rotation of the crank shaft. The sixth means counts the pulses of the first and second pulse trains, produces the injection timing signal when the first pulses and second pulses reach given values and presets the first and second counter values to the first and second value in response to the third sensor signal.« less
  • An air/fuel ratio control system is disclosed for use with an internal combustion engine, in which acceleration detecting circuit produces a signal indicative of engine acceleration when the engine RPM increases across a predetermined value which is slightly higher than an idle rpm to which the engine is adjusted, and driving pulse supply means is responsive to this acceleration signal to supply driving pulses to a pulse motor to cause it to move the valve position of an air/fuel ratio control valve to a preset position whereby improved exhaust gas emission characteristics of the engine can be obtained at themore » standing start of the engine and during subsequent normal operation thereof.« less