Valve feedback control having redundant valve opening sensors

Details Valve feedback control having redundant valve opening sensors Valve feedback control having redundant valve opening sensors

1996-03-06

1997-09-23

Nelli, Raymond A.

Internal-combustion engines

Engine speed regulator

Open loop condition responsive

F02D 700

Patent

active

056693532

ABSTRACT:
A throttle control system has two throttle opening sensors. When one sensor in a PID feedback control loop becomes abnormal, as sensed by monitoring the difference between outputs of the dual sensors, the use of sensor output for throttle feedback control is switched from the abnormal one to the other, normal one. Which one of the throttle opening sensors has become abnormal is determined by monitoring the intensity of electric current flowing to a DC motor which drives the throttle valve. Further, if an abnormality in the newly-used other sensor is determined, feedback control is continued based on an estimation of throttle opening calculated by using output of the sensor before its malfunction.

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Patent Abstracts of Japan, vol. 018, No. 644 (M-1718) 7 Dec. 1994 & JP-A-06 249040 (Mitsubishi Electric Corp), 6 Sep. 1994.
Patent Abstracts of Japan, vol. 016, No. 111 (M-1223), 18 Mar. 1992 & JP-A-03 281969 (Suzuki Motor Corp), 12 Dec. 1991.

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