Abstract: An onboard device includes a first cover member having a first abutment surface, a second cover member having a second abutment surface abutting on the first abutment surface and an internal space for housing an electrical apparatus with the first cover member, a transmission portion that is formed in one or both of the first and second cover members, extends, from the first and second abutment surfaces, outward in an abutment direction in which the first and second abutment surfaces abut against each other and transmits sound more easily from the internal space to outside of the first and second cover members than adjacent regions in the first and second cover members, and a soundproof cover that has a through-hole penetrating in the abutment direction. The first abutment surface, the second abutment surface, and the transmission portion are located inside the through-hole.

Abstract: An onboard device includes a first cover member having a first abutment surface, a second cover member having a second abutment surface abutting on the first abutment surface and an internal space for housing an electrical apparatus with the first cover member, a transmission portion that is formed in one or both of the first and second cover members, extends, from the first and second abutment surfaces, outward in an abutment direction in which the first and second abutment surfaces abut against each other and transmits sound more easily from the internal space to outside of the first and second cover members than adjacent regions in the first and second cover members, and a soundproof cover that has a through-hole penetrating in the abutment direction. The first abutment surface, the second abutment surface, and the transmission portion are located inside the through-hole.

Abstract: A vehicle includes an inverter, a motor, a transmission, and a modulator. The inverter performs pulse width modulation processing at a predetermined carrier frequency. The motor is supplied with electric power from the inverter. The transmission changes the number of revolutions of the motor, and transmits rotary power of the motor to one or more driving wheels. The modulator controls the pulse width modulation processing performed by the inverter, and changes the carrier frequency of the pulse width modulation processing, to offset a change in a frequency of a sideband component out of frequencies of a carrier sound. The carrier sound is generated in the motor or the inverter, or both, accompanying a stepwise change in the number of revolutions of the motor on a condition that the stepwise change is made by the transmission.

Abstract: A vehicle includes an inverter, a motor, a transmission, and a modulator. The inverter performs pulse width modulation processing at a predetermined carrier frequency. The motor is supplied with electric power from the inverter. The transmission changes the number of revolutions of the motor, and transmits rotary power of the motor to one or more driving wheels. The modulator controls the pulse width modulation processing performed by the inverter, and changes the carrier frequency of the pulse width modulation processing, to offset a change in a frequency of a sideband component out of frequencies of a carrier sound. The carrier sound is generated in the motor or the inverter, or both, accompanying a stepwise change in the number of revolutions of the motor on a condition that the stepwise change is made by the transmission.