Idle speed control system for a two-cycle engine

摘要

A two-cycle engine has a scavenge pump provided in an intake passage, and a fuel/air injector provided for injecting fuel directly in a cylinder of the engine together with air. A control unit has a calculator for calculating quantities of fuel and air injected from the fuel/air injector and for producing a fuel injection pulse width signal and an air injection pulse width signal based on the calculated quantities. Engine speed at idling state is compared with a desired idle speed and an error signal is produced. At least one of the pulse width signals is corrected with a correction value for controlling the injection quantity so as to cause the idle speed to converge to the desired idle speed.