Method and device for variable idle speed control of an internal

Details Method and device for variable idle speed control of an internal Method and device for variable idle speed control of an internal

1990-03-07

1991-08-20

Wolfe, Willis R.

Internal-combustion engines

Engine speed regulator

Idle speed control

123342, F02D 1110, F02D 4116

Patent

active

050405071

ABSTRACT:
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.

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