Patent ID: 7721708

Claim:
A system for controlling a general-purpose internal combustion engine having a plurality of cylinders each equipped with a throttle valve that opens or closes an air intake path and a fuel injector that injects fuel into a combustion chamber, and a cooling fan that draws in and blows air onto the cylinders as cooling air, said system comprising: a throttle driver that drives an actuator of the respective throttle valves of each of the cylinders to open or close; an injector driver that drives the respective fuel injectors of each of the cylinders to open; and a controller that controls operation of the throttle driver and injector driver in such a way that the throttle opening and an amount of fuel to be injected are different for each of the cylinders such that an engine speed becomes substantially constant, wherein the cylinders are positioned at different locations in the flow of the cooling air, and the controller increases the throttle opening and the amount of fuel to be injected of one of the cylinders positioned upstream, relative to the throttle opening and the amount of fuel to be injected of the other cylinder positioned downstream such that the throttle opening and the amount of fuel to be injected are different for each of the cylinders.