Throttle valve control apparatus of vehicle

Internal-combustion engines – Engine speed regulator – Idle speed control

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Details

36443105, F02M 908

Patent

active

053948475

ABSTRACT:
A throttle control system reliably determines failure of a throttle valve driving system. During engine idling, a throttle valve is opened and closed by an actuator. A central processing unit generates a pulse-like drive signal to the actuator through a back-up integrated circuit. When the frequency of the drive signal exceeds a predetermined value, the back-up integrated circuit determines that a failure in the central processing unit has occurred. Since this determination is based on the frequency of the drive signal, a driving system failure can be reliably detected even using pulse-like signals.

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patent: 5307776 (1994-05-01), Unuvar et al.
patent: 5307777 (1994-05-01), Sasajima et al.

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