Failure diagnosis device for an automotive engine
First Claim
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1. A failure diagnosis device for an engine, comprising:
- (a) detection means for detecting operation states of the engine;
(b) failure diagnosis means for effecting failure diagnosis of an engine in accordance with outputs of said detection means;
(c) first memory means for storing predetermined values representing normal operation states of the engine;
(d) second memory means for storing cumulative values of outputs of said detection means;
(e) comparison judgment means for judging whether said cumulative values have exceeded said predetermined values; and
(f) failure diagnosis condition judgment means for enabling said failure diagnosis means to effect failure diagnosis of the engine in response to an affirmative judgment of said comparison judgment means, and for judging whether or not said failure diagnosis has been completed on the basis of the cumulative values of the outputs of the detection means.
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Abstract
The control unit 2 of an automobile includes: a ROM 2b for storing predetermined values representing normal (i.e., warmed-up) operating states of the engine, and a RAM 2c for storing cumulative values of outputs of various sensors. The cumulative values are continually compared with the predetermined values, and failure diagnosis of the engine is effected only when the cumulative values exceed the predetermined values.
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Citations
4 Claims
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1. A failure diagnosis device for an engine, comprising:
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(a) detection means for detecting operation states of the engine; (b) failure diagnosis means for effecting failure diagnosis of an engine in accordance with outputs of said detection means; (c) first memory means for storing predetermined values representing normal operation states of the engine; (d) second memory means for storing cumulative values of outputs of said detection means; (e) comparison judgment means for judging whether said cumulative values have exceeded said predetermined values; and (f) failure diagnosis condition judgment means for enabling said failure diagnosis means to effect failure diagnosis of the engine in response to an affirmative judgment of said comparison judgment means, and for judging whether or not said failure diagnosis has been completed on the basis of the cumulative values of the outputs of the detection means. - View Dependent Claims (2, 3, 4)
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Specification