| 摘要 |
A device for detecting an obstacle located backward of a vehicle is mounted on a vehicle such as a pickup truck having a rear loading space and a tailgate for closing the loading space. Ultrasonic waves are transmitted backward, and the backward obstacle is detected by receiving ultrasonic waves reflected by the backward obstacle. When the tailgate is open or the load extends backward from the open tailgate, the transmitted waves are reflected by the open tailgate or the extending load. This may cause erroneous detection of the backward obstacle. To avoid the erroneous detection, detection of the reflected waves from the backward obstacle is delayed by a predetermined period when the tailgate is open or the load extends backward.
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