Idling revolution control device for an internal combustion engine
AssigneeNissan Motor Co., Ltd.
InventorSadao Takase
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Abstract
An idling rpm control device for an internal combustion engine for controlling idling rpm of the engine depending upon operating parameters, comprises range detecting means for detecting a range of variations in idling rpm of the engine. According to the invention if an rpm variation range is more than a predetermined value, an air-fuel ratio of mixture is controlled toward a richer mixture and as the result if the range is increased, the air-fuel ratio is controlled toward a leaner mixture, thereby minimizing the rpm variation range to improve operation of a vehicle equipped with the engine.
Claims4
An idling rpm control device for an internal combustion engine for controlling idling rpm thereof depending upon operating parameters thereof, comprising:
- (a) a revolution sensor for producing signals indicative of engine revolutions;
- (b) rpm range detecting means for detecting a range of variations in idling rpm of the engine, said range detecting means comprising a range detecting circuit for receiving said signals from said revolution sensor and generating a signal corresponding to a range of variations in rpm of the engine;
- and
- (c) fuel control means for changing a fuel-air ratio of mixture to decrease said range of variations in idling rpm, said fuel control means comprising a change control circuit for generating signals for changing the fuel-air ratio of mixture when said signal from said range detecting circuit is more than a determined value, and a fuel control circuit for changing the fuel-air ratio of mixture in response to the signal from said change control circuit and receiving signals corresponding to parameters from a temperature sensor for detecting temperature of the engine, said revolution sensor for detecting revolutions of the engine and an intake air flow sensor for detecting intake air flow rate to generate driving pulses for actuating a fuel injection valve.
Dependencies are inferred from the claim text.