FUEL-SUPPLY CONTROL SYSTEM

摘要

A fuel-supply control system for an engine includes a line in which fuel may flow to be supplied to the engine. At least two parallel connected control valves are arranged in the line and are changed from one of open and closed states to the other when energized. A sensor is provided for detecting an engine operating condition. A generator is provided for producing such a random figures signal indicating any one of different figures in a random sequence that the number of the different figures is equal to that of the control valves to make the figure designate the control valves respectively. A controller is provided for producing a pulse train as a drive signal for the control valves in response to the output signal of the sensor so that the duty cycle of the pulse train varies with the engine operating condition. The controller distributes each pulse of the drive signal to any one of the control valves designated by the random figure signal of the generator to open the designated control valve so that any one of the control valves is opened in a random sequence. The number of the control valves may be one. In this case, each pulse width of the drive signal changes at random within a relatively small range in response to the random figure signal from the generator.