| 摘要 |
PROBLEM TO BE SOLVED: To suppress mixture of noise into a receiver of an own vehicle, when performing PWM control of a motor, and to also reduce the effects on the receiver of another vehicle.SOLUTION: A plurality of PWM frequencies for each reception channel are determined so that a first frequency, having harmonic components belonging to the frequency band of a reception channel, is also included in the plurality of PWM frequencies subjected to spread modulation. Furthermore, when performing spread modulation to the plurality of PWM frequencies, the ratio of modulation to each PWM frequency is determined so that the ratio of modulation to a PWM frequency corresponding to the first frequency is smaller than the ratio of modulation to a PWM frequency corresponding to the second frequency having harmonic components not belonging to the frequency band of a reception channel. |
