Patent ID: 7441547

Claim:
A fuel feed amount control system of an engine, comprising: an engine speed sensor configured to detect an engine speed of the engine; a fuel feeder configured to feed fuel to air taken into the engine from outside; at least one of a throttle opening degree sensor configured to detect an opening degree of a throttle valve and an air-intake pressure sensor configured to detect a pressure of the air taken into the engine; a controller configured to cause the fuel feeder to feed a predetermined amount of fuel to air, based on a signal received from the engine speed sensor; wherein the controller is configured to obtain a time-lapse change rate of the engine speed based on the signal received from the engine speed sensor, determine that the engine is decelerating based on the time-lapse change rate, and cause the fuel feeder to reduce a fuel feed amount to less than a reference amount preset according to the engine speed responsive to determining that the engine is decelerating; and wherein the controller is configured to determine that the engine is decelerating, based on the time-lapse change rate of the engine speed, the engine speed, and at least one of the throttle opening degree obtained from a signal received from the throttle opening degree sensor and the air-intake pressure obtained from a signal received from the air-intake pressure sensor.