| 摘要 |
Inter-vehicle proximity warning device for providing a visible and/or audible warning when a vehicle is closer than a predetermined distance to another vehicle. The device includes a voltage regulator 1, a speed sensor 2, an amplifier 3, a vehicle turning sensor 4, a power stabiliser 5, a proximity detector 6 and a warning device 7 connected in series and in that order. The proximity detector 6 includes a Gunn oscillator beam projector and a mixer diode beam detecting means. The device is suitable for sensing the proximity of a following or a followed vehicle and the warning device 7, includes a high intensity brake light 7 or a dashboard mountable visual or audible warning means depending on whether the proximity sensor faces backwards or forwards. Actuation of the device can be arranged to occur automatically upon illumination of a vehicle's fog lamps and deactivation may occur when the vehicle is travelling below a predetermined speed or turning more than a predetermined amount. Ultrasonic or infra-red sensors may be used in alternative embodiments. The speed sensor 2 is a piezo-electric airflow (air pressure) sensor (fig 2). |
