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Title: Failsafe engine fuel control system

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.
Authors:
;
Publication Date:
OSTI Identifier:
5802629
Report Number(s):
US 4704685
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