Spark timing control system for an internal combustion engine
First Claim
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1. A spark ignition timing control system for use with an internal combustion engine comprising:
- (a) a first means for sensing engine vibration magnitude, and for comparing said sensed vibration magnitude with a first predetermined value and generating an output signal when said sensed vibration magnitude is greater than said first predetermined value;
(b) a second means for comparing the output signal of said first means with a second predetermined value and generating a knocking signal when the output signal of said first means is greater than said second predetermined value;
(c) a third means for adjusting the engine spark advance angle in response to said knocking signal; and
(d) a fourth means for detecting an unstable engine condition and interrupting operation of said third means in response thereto,whereby upon the occurrence of an unstable engine condition said engine spark advance angle adjustment is suspended.
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Abstract
An ignition spark timing control system for an internal combustion engine capable of controlling the ignition spark advance angle corresponding to a knocking condition of the engine. The spark timing control system includes a means for retarding spark timing in response to an engine knocking condition and a means for detecting unstable driving condition of the engine and interrupting the retarding of the spark timing when the engine driving condition is unstable in order to maximize the engine output characteristics and improve fuel economy.
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Citations
18 Claims
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1. A spark ignition timing control system for use with an internal combustion engine comprising:
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(a) a first means for sensing engine vibration magnitude, and for comparing said sensed vibration magnitude with a first predetermined value and generating an output signal when said sensed vibration magnitude is greater than said first predetermined value; (b) a second means for comparing the output signal of said first means with a second predetermined value and generating a knocking signal when the output signal of said first means is greater than said second predetermined value; (c) a third means for adjusting the engine spark advance angle in response to said knocking signal; and (d) a fourth means for detecting an unstable engine condition and interrupting operation of said third means in response thereto, whereby upon the occurrence of an unstable engine condition said engine spark advance angle adjustment is suspended. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A spark ignition timing control system for an internal combustion engine, comprising:
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knock detector adapted to detect knocking condition of the engine and producing a first signal having a value proportional to the magnitude of engine knocking; means for comparing said first signal value with a predetermined reference value to detect a magnitude of the engine knocking above a predetermined threshold value, said comparing means producing a second signal when the first signal value is above said reference value; a spark advance means responsive to said second signal to retard spark advance angle at a given rate, said spark advance means advancing said spark advance angle at a given rate when said second signal is absent; and means for detecting at least one preselected engine operating condition for which said spark advance angle is not to be retarded, and for disabling the spark advance means to prevent retarding of said spark advance angle when said at least one of specific engine operation condition is detected. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification