Patent ID: 7150263

Claim:
An engine speed control apparatus comprising: a throttle valve arranged to adjust an amount of an intake air sucked into an engine; a drive unit arranged to drive the throttle valve; and a control unit arranged to generate a PWM signal used to drive the drive unit; the control unit including: a real speed detecting unit arranged to detect a real engine speed; a target speed setting unit arranged to set a target engine speed; a target speed change amount calculating unit arranged to calculate a target engine speed change amount using the real engine speed detected by the real speed detecting unit and the target engine speed set by the target speed setting unit; and a PWM pulse generating unit arranged to calculate a PWM control parameter according to the target engine speed change amount calculated by the target speed change amount calculating unit, and generate a PWM signal based on the calculated PWM control parameter, so as to supply the generated PWM signal to the drive unit, the PWM control parameter including at least one of a PWM duty correction value for correcting a duty ratio of the PWM signal, a PWM duty correction value maintaining time during which the PWM duty correction value is continuously applied, and a PWM duty correction frequency at which the PWM duty correction value is applied.