Patent ID: 8838361

Claim:
An apparatus for controlling a general-purpose internal combustion engine connectable to an operating machine to be used as a prime mover of the machine, having: a throttle opening regulator adapted to regulate a throttle opening of a throttle valve installed in an air intake pipe of the engine such that a speed of the engine is converged to a desired engine speed set by an operator; a basic fuel injection amount calculator adapted to calculate a basic fuel injection amount based on the engine speed and the throttle opening; and a warm-up controller adapted to control warm-up operation of the engine by correcting the calculated basic fuel injection amount with a warm-up correction coefficient to calculate a warm-up time fuel injection amount after start operation of the engine is completed, and by injecting fuel from an injector by the calculated warm-up time fuel injection amount, wherein the improvement comprises: a maximum output fuel injection amount searcher adapted to search for a searched fuel injection amount with which an output of the engine becomes maximum based on the throttle opening regulated in response to increasing/decreasing operation of the warm-up time fuel injection amount conducted when the engine speed is constant; and a warm-up correction coefficient corrector adapted to correct the warm-up correction coefficient using the searched fuel injection amount, and wherein the maximum output fuel injection amount searcher searches the fuel infection amount with which the output of the engine becomes maximum based on a minimum value of the throttle opening regulated in response to the increasing/decreasing operation of the warm-up time fuel injection amount.