Method and device for variable idle speed control of an internal combustion engine

摘要

A method and device for providing a time-varying minimum engine speed setting are disclosed. A first embodiment of the device includes programming within an electronic engine control module for variably supplying fuel to an engine via variable activation periods for the fuel injectors of a fuel injected engine. In another embodiment a rotating cam provides a positionally time-varying mechanism stop against which the throttle linkage is positioned when released by the operator. In another embodiment of the invention, a solenoid provides a minimum engine speed setting which varies between two different positions. The two different positions are produced by a solenoid, which is activated and deactivated at random to produce a pseudo-random variation in minimum engine speed. Pulse-width activation of the solenoid provides variable positioning of the solenoid actuator between the two end stop positions of the solenoid actuator.