| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent the noise coming in a car radio due to the high harmonic component of a PWM driving frequency by receiving specific outside information and changing the driving frequency of a PWM control signal based on the received signal. SOLUTION: The control means 15 of the motor drive controller 1 of a vehicle is provided with a receiving means 24 which receives specific outside information JG and a frequency changing means 25 which changes the driving frequency of a PWM(pulse with modulation) control signal based on a signal SD from the receiving means 24. Therefore, the control means 15 can receive the specific outside information JG, can change the driving frequency of the PWM control signal in accordance with the information JG, and can set the higher harmonic component of a PWM driving frequency to a value which is separated from the channel frequency of a car radio. Therefore, even when PWM drive is performed on a motor mounted on the vehicle, the noise which is caused by the higher harmonic component of the PWM driving frequency and comes in the radio when the frequency of the component becomes closer to the channel frequency of the radio can be prevented.</p> |
