Throttle valve control apparatus for use with internal combustio

Details Throttle valve control apparatus for use with internal combustio Throttle valve control apparatus for use with internal combustio

1991-04-04

1992-05-19

Nelli, Raymond A.

Internal-combustion engines

Engine speed regulator

Open loop condition responsive

123361, F02D 700

Patent

active

051138239

ABSTRACT:
A throttle valve control apparatus for use with an internal combustion engine having a throttle valve urged in a given direction by means of a return spring performs throttle position control to bring a throttle valve to a required position. Prior to the throttle position control, a sensed throttle valve position is compared with a predetermined value. When a difference between the sensed throttle valve position and the predetermined value is not within a predetermined range, a failure signal is produced to indicate that the return spring is subject to failure. If the throttle position control is a closed loop throttle position control employing an integral correction term, the apparatus may be arranged to produce the failure signal by comparing the integral correction term with a predetermined value after the sensed throttle valve position converges to the required throttle valve position. In the event of failure of the return spring, the throttle valve is held at a predetermined fail-safe position with the closed loop throttle position control being inhibited. 2

REFERENCES:
patent: 4960091 (1990-10-01), Aufmkolk
patent: 4962570 (1990-10-01), Haraka et al.
patent: 4969431 (1990-11-01), Wataya
patent: 4972817 (1990-11-01), Wilde et al.
patent: 4979117 (1990-12-01), Hattori et al.
patent: 4986238 (1991-01-01), Terazawa

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