Motor vehicles – With means for controlling operation responsive to... – Radiation – force – or waves reflected from external object or...
Patent
1993-11-05
1996-06-25
Johnson, Brian L.
Motor vehicles
With means for controlling operation responsive to...
Radiation, force, or waves reflected from external object or...
180197, 340903, 342 59, 342 71, 342109, 36442604, B62D 124, B60T 716, B60K 2800
Patent
active
055291384
ABSTRACT:
An automobile collision avoidance system based on laser radars is disclosed for aiding in avoidance of automobile collisions. The very small beam width, very small angular resolution and the highly directional character of laser radars provide a plurality of advantages as compared with microwave radars. With two sets of laser radars this system can detect the location, the direction of movement, the speed and the size of all obstacles specifically and precisely. This system includes laser radars with transmitters and receivers, a computer, a warning device and an optional automatic braking device. A steering wheel rotation sensor or a laser gyroscope is utilized to give information of system-equipped vehicle's directional change. The system will compare the predicted collision time with the minimal allowable time to determine the imminency of a collision, and when determined, provides a warning. An optional automatic braking device is disclosed to be used when the vehicle user fails to respond to a warning. Furthermore, a wheel skidding detecting system based on a discrepancy between the directional change rate predicted by a steering wheel rotation sensor and the actual directional change rate detected by a laser gyroscope is also disclosed. The detection of wheel skidding can be utilized by various vehicle control designs. An averaging device for a steering wheel and a vehicle tilting sensor are used to supplement the steering wheel rotation sensor to improve the accuracy of the automobile collision avoidance system and the wheel skidding detecting system.
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Shaw David C. H.
Shaw Judy Z. Z.
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