Obstacle detection system

摘要

A plurality of ultrasonic sensors (10 to 70) is provided in both front and rear bumpers of a vehicle to detect obstacles around the vehicle. Each sensor (10) sets up a transmission frequency of an ultrasonic pulse signal that should be set up in a frequency adjustment circuit (12) and a center frequency in filter processing in a filter circuit (15) in response to a frequency setting frame transmitted from an ECU (30). The ECU (30) stores a combination of the transmission frequency and the center frequency for each ultrasonic sensor.