Denso Corporation

Denso Corpora Tion

Dai Kondo

Masayoshi Satake

Kensuke Kobayashi

Mitsuyasu Matsuura

Taketo Harada

Yu Koyama

Takuya Nomura

Tetsuya Aoyama

Kenji Fukabori

Youhei Suzuki

Syoya Ishida

Kenzo Kano

Yudai Yamamoto

An ultrasonic sensor includes an adhesion sensor including a variable capacitance and a fixed capacitance. The variable capacitance includes a sensor electrode provided on a first surface of a bottom having a microphone installed thereon and a capacitance value thereof changes in accordance with adhesion of foreign matter on the first surface. The fixed capacitance includes a first electrode connected to the sensor electrode, and a second electrode provided on a member different from a microphone housing and disposed facing the first electrode. The adhesion sensor further includes an adhesion detecting section that is connected to the sensor electrode via the fixed capacitance and detects adhesion of foreign matter to the first surface by supplying an alternating-current signal to the fixed capacitance and the variable capacitance.

Ultrasonic sensor

An ultrasonic sensor is provided with an ultrasonic element that converts between an electrical signal and an ultrasonic vibration and an element accommodating case having a bottomed cylindrical shape and accommodating the ultrasonic element inside thereof. The element accommodating case includes a side plate portion formed in a cylindrical shape that surrounds a directional center axis, and a bottom plate portion that closes one end side of the side plate portion in an axial direction which is parallel to the directional center axis. The ultrasonic element is attached to the bottom plate portion. The bottom plate portion includes at least one protrusion. The protrusions vibrate together with the bottom plate portion when the bottom plate portion vibrates as an ultrasonic vibration.

An object detection device includes: a wave receiver that receives a reflected wave generated by reflection, by an object, of a transmission wave incident on the object; a determination section that determines whether, in a change over time in an amplitude of the reflected wave received by the wave receiver, an amplitude of a falling portion is greater than a predetermined criterion, the amplitude of the falling portion being decreased after the amplitude has reached a maximum value; and a processing section that, on the basis of a determination by the determination section that the amplitude of the falling portion is greater than the predetermined criterion, performs a process in which the object is treated as an object to be avoided.

Object detection device

An object detection device includes: a transceiver section that transmits an ultrasonic wave and receives an ultrasonic wave including a reflected wave of the transmitted ultrasonic wave, and outputs a signal in accordance with a wavelength of the received ultrasonic wave; a frequency control section that changes a frequency of the ultrasonic wave transmitted by the transceiver section to a plurality of frequencies different from a driving frequency used to detect the distance from the object; and a fault determination section that determines whether a fault occurs in the function of detecting the distance from the object due to a value of an environment temperature or a wavelength of the ultrasonic wave transmitted by the transceiver section, based on a value of the signal outputted from the transceiver section when the transceiver section transmits the ultrasonic wave at a selected one of the frequencies different from the driving frequency.

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Kariya, Japan

Dai Kondo