CN-116848004-B - Ultrasonic object detection device

CN116848004BCN 116848004 BCN116848004 BCN 116848004BCN-116848004-B

Abstract

An ultrasonic object detection device (1) is provided with a resin vibration plate (12A), an ultrasonic sensor (6A), and an ultrasonic absorber (25A). A resin-made vibration plate (12A) is disposed outside a door that opens and closes an opening (3 a) of a vehicle body (3) so as to extend in the longitudinal direction of the vehicle. The ultrasonic sensor (6A) is disposed on the inner surface (12A) of the diaphragm (12A) and can transmit and receive ultrasonic waves. The ultrasonic absorber (25A) is configured to cover the inner surface (12A) of the vibration plate (12A) in a manner including the ultrasonic sensor (6A).

Inventors

Deliuchev

Assignees

株式会社有信

Dates

Publication Date: 20260508
Application Date: 20220207
Priority Date: 20210219

Claims (5)

1. An ultrasonic object detection device is provided with: a resin-made vibration plate disposed outside a door that opens and closes an opening of a vehicle body so as to extend in a vehicle length direction; an ultrasonic sensor disposed on the inner surface of the diaphragm and capable of transmitting and receiving ultrasonic waves, and An ultrasonic wave absorber configured to cover an inner surface of the vibration plate in a manner including the ultrasonic sensor, The vibration plate is arranged at the lower part of the door, The ultrasonic object detection device further includes a first vibration reduction member disposed at a portion of the inner surface of the vibration plate below the ultrasonic sensor, The ultrasonic absorber is configured to interface with a surface of the first vibration reduction member.
2. The ultrasonic object detection device according to claim 1, wherein, The ultrasonic object detection device further includes a second vibration reduction member disposed on an outer panel of the door at a portion facing the vibration plate.
3. The ultrasonic object detection device according to claim 2, wherein, The second vibration damping member is disposed on an outer surface of the outer plate.
4. The ultrasonic object detection device according to claim 2, wherein, The second vibration damping member is disposed on an inner surface of the outer plate.
5. The ultrasonic object detection device according to any one of claims 1 to 4, wherein, The vibration plate is a part of the side molding.

Description

Ultrasonic object detection device Technical Field The present invention relates to an ultrasonic object detection device. Background An ultrasonic object detection device is known for avoiding collision of a door of a vehicle with an obstacle when opening the door. The ultrasonic object detection device is provided with an ultrasonic sensor capable of transmitting and receiving ultrasonic waves. The ultrasonic object detection device measures a time from when an ultrasonic sensor transmits ultrasonic waves to when the ultrasonic sensor receives ultrasonic waves reflected by an object, and detects the presence or absence of an obstacle and a distance from the obstacle based on the time. Patent document 1 discloses an ultrasonic sensor assembly in which a sensor is disposed inside a door panel so as not to provide an opening in the door, thereby improving the design of a vehicle. Prior art literature Patent literature Patent document 1 specification of U.S. Pat. No. 10393864 Disclosure of Invention Problems to be solved by the invention When the ultrasonic sensor is disposed in the door of the vehicle without providing an opening as described above, a part of the ultrasonic waves transmitted from the outer panel (typically made of steel plate) of the door is trapped, and transverse waves remain in the outer panel. The ultrasonic sensor continuously senses transverse waves remained on the outer plate until the transverse waves are attenuated. As a result, the ultrasonic sensor may not recognize the longitudinal wave reflected by the obstacle and the transverse wave remaining on the outer panel, and it may be difficult to detect the obstacle. In the ultrasonic sensor assembly described in patent document 1, a vibration damping member (DAMPING MATERIAL) is provided to attenuate transverse waves remaining on the outer panel. As a result, transverse wave residue on the outer panel can be suppressed, and the reception sensitivity can be improved. However, in order to obtain a sufficient receiving sensitivity, a vibration damping member is required, and the structure of the ultrasonic sensor assembly becomes complicated. The invention aims to provide an ultrasonic object detection device which can reliably detect an object while simplifying the structure. Solution for solving the problem An ultrasonic object detection device is provided with a resin vibration plate disposed outside a door that opens and closes an opening of a vehicle body so as to extend in the longitudinal direction of the vehicle, an ultrasonic sensor disposed on the inner surface of the vibration plate so as to be capable of transmitting and receiving ultrasonic waves, and an ultrasonic absorber disposed so as to cover the inner surface of the vibration plate so as to include the ultrasonic sensor. Generally, transverse waves are less likely to remain in a resin material. Therefore, even when the vibration plate is not provided with, for example, a vibration damping member, interference between reflected waves (longitudinal waves) reaching the vibration plate and transverse waves remaining in the vibration plate can be suppressed or prevented, and the ultrasonic sensor can reliably receive the reflected waves. Further, the ultrasonic wave absorber is provided on the inner surface of the diaphragm, whereby it is possible to prevent ultrasonic waves advancing toward the inside (door side) of the diaphragm from being reflected by the door and received by the diaphragm, among ultrasonic waves generated by the vibration of the diaphragm. That is, erroneous sensing can be prevented. In summary, the vibration damping material for damping the transverse wave in the vibration plate is not provided, that is, the structure of the ultrasonic object detection device is simplified and the object around the vehicle can be reliably detected. Effects of the invention According to the ultrasonic object detection device of the present invention, an object can be reliably detected while simplifying the structure. Drawings Fig. 1 is a side view of an automobile provided with an ultrasonic object detection device according to a first embodiment of the present invention. Fig. 2 is a block diagram of the ultrasonic object detection device of the first embodiment. Fig. 3 is a cross-sectional view of the door at line III-III of fig. 1. Fig. 4 is an enlarged view of a portion IV of fig. 3. Fig. 5 is a partial cross-sectional view of the door at line V-V of fig. 1. Fig. 6 is a side view of an automobile provided with an ultrasonic object detection device according to a second embodiment of the present invention. Fig. 7 is a cross-sectional view of the door at line VII-VII of fig. 6. Fig. 8 is an enlarged view of part VIII of fig. 7. Fig. 9 is an enlarged view of a portion IX of fig. 6 of an ultrasonic object detection device according to a third embodiment of the present invention. Fig. 10 is a cross-sectional view taken at line X-X of fig. 9. Fig. 11 is a cross-sectional