Abstract: An abnormality monitoring device monitors a PWM driving signal output from a driving section of an associated motor control system to judge whether the driving section is operating abnormally. By monitoring the output of the driving section, the monitoring device can detect an abnormality of the driving section before the motor can respond to the abnormal drive signal to a significant degree (e.g., to a degree readily discernable to a rider of a motorcycle on which the motor control system is employed in combination with an electronic throttle system).

Abstract: 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.

Abstract: An abnormality monitoring device monitors a PWM driving signal output from a driving section of an associated motor control system to judge whether the driving section is operating abnormally. By monitoring the output of the driving section, the monitoring device can detect an abnormality of the driving section before the motor can respond to the abnormal drive signal to a significant degree (e.g., to a degree readily discernable to a rider of a motorcycle on which the motor control system is employed in combination with an electronic throttle system).

Abstract: 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.