System and method for controlling engine revolutions for vehicular internal combustion engine
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United States of America Patent
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Sep 17, 1991
Grant Date -
N/A
app pub date -
Jan 26, 1990
filing date -
Jan 27, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A system and method for controlling an engine revolution speed are disclosed in which upon a reduction in coolant temperature, a control signal is supplied to an idling control valve having a duty ratio reducing the duty ratio corresponding to the opening angle of the idling control valve when an engine coolant temperature is below a predetermined value so that during an engine deceleration in which an air regulator is open, an increase in a boost pressure is prevented and no reduction of the engine revolution speed occurs or engine revolution speed during the idling does not become excessively high.
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