Distance Measuring Alert Sensor for Vehicle

摘要

A distance measuring sensor for mounting on a vehicle has an ultrasound sensing unit 21, a microwave sensing unit 22, a controller 24 and an alarm 23. If the controller receives a sensing signal from either the ultrasound unit or the microwave unit, the controller outputs an alarm signal to alert the driver. The microwave unit detects objects in the long range and the ultrasonic unit detects objects in the close range; if a sensing signal is generated by both units then the distance measured by both units may be compared and the lesser value taken to be the distance to the object. The ultrasound unit may be a plurality of transducers 210 operated sequentially. The controller may be connected to the vehicles central locking system 30 in order to prevent a door being opened if an object is detected moving at a speed equal to or above a predetermined safe speed relative to the vehicle.