Abnormality detecting apparatus for means for sensing operating

Internal-combustion engines – Charge forming device – Fuel injection system

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123425, 123480, F02B 300, G06F 1104

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active

045413860

ABSTRACT:
An abnormality detecting apparatus for detecting abnormality in sensing means for sensing a value of an operating parameter of an internal combustion engine in synchronism with generation of pulses of a signal indicative of predetermined rotational angle positions of said engine. When the sensed value of the operating parameter lies outside a predetermined range, first timer means measures time elapsed from the instant at which the sensed value of the operating parameter falls outside the predetermined range, and decision means decides that the operating parameter sensing means is faulty when the elapsed time measured by the first timer means exceeds a first predetermined period of time. Second timer means, which is reset each time a pulse of the above signal is generated, measures time elapsed from the instant at which it becomes reset, and is adapted to halt the measuring operation of the first timer means when the elapsed time measured by the second timer means reaches a second predetermined period of time which is shorter than the first predetermined period of time.

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