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Engine speed control apparatus; engine system, vehicle and engine generator each having the engine speed control apparatus; and engine speed control method
Engine speed control apparatus; engine system, vehicle and engine generator each having the engine speed control apparatus; and engine speed control method
An engine speed control apparatus includes a throttle valve for adjusting the amount of an intake air sucked into an engine, a drive unit for driving the throttle valve, and a control unit for generating a PWM signal for driving the drive unit. The control unit includes a real speed detecting unit for detecting a real engine speed, a target speed setting unit for setting a target engine speed, a target speed change amount calculating unit for calculating a target engine speed change amount with the use of the real engine speed and the target engine speed, and a PWM pulse generating unit which calculates, according to the target engine speed change amount, a PWM control parameter for determining a PWM duty, and generates 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 includes at least one of a PWM duty correction value for correcting the duty ratio of a 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.
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