Engine control system
AssigneeNissan Motor Co., Ltd.
InventorYoshimasa Hayashi
Life of this patent
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Abstract
A control system for an internal combustion engine of a vehicle equipped with an automatic transmission, comprises a first device for detecting an operating parameter in relation to vehicle cruising, a second device for detecting an engine temperature, and a third device for lowering engine speed at the fully closed position of a throttle valve in response to the detected operating parameter and the detected engine temperature, thereby effectively reducing fuel consumption and engine noise without deterioration in engine running stability.
Claims10
A control system for an internal combustion engine of a vehicle equipped with an accelerator pedal and an automatic transmission, comprising:
- means for detecting one of an engine speed and a vehicle speed not lower than a predetermined level;
- means for detecting an engine temperature not lower than a predetermined level;
- means for decreasing the amount of air to be supplied to the engine by a predetermined amount during release of said accelerator pedal and only in response to (1) said one detected speed and (2) said engine temperature being both not lower than said respective predetermined levels;
- and
- wherein said vehicle has a throttle valve controlled by the accelerator pedal and wherein the air amount decreasing mean includes throttle regulating means operative for placing the fully closed position of the throttle valve in a first state when at least one of said detected speeds is lower than said predetermined level and said engine temperature is lower than said predetermined level, and a second state when at least one of said detected speeds is not lower than said predetermined level and said engine temperature is not lower than said predetermined level, the valve opening degree of said second state being smaller than that of said first state.
Dependencies are inferred from the claim text.