Part time four wheel drive vehicle with road surface condition s

Details Part time four wheel drive vehicle with road surface condition s Part time four wheel drive vehicle with road surface condition s

1985-10-03

1987-07-07

Love, John J.

Motor vehicles

Having four wheels driven

With manually operated means for disengaging drive to one or...

180167, 180 791, B62D 124, B60F 1734

Patent

active

046780564

ABSTRACT:
A four wheel drive motor vehicle is equipped with a change-over unit for selecting a four wheel drive mode or a two wheel drive mode, a road surface condition sensing sonar system, and an actuator for actuating the change-over unit to change the drive system to the four wheel drive mode when the road surface condition sensing system determines that the road surface is slippery. The road surface condition sensing means has ultrasonic transmitter and receiver, and a control unit such as a microcomputer for determining whether the intensity of waves reflected from the road surface is equal to or lower than a predetermined value.

REFERENCES:
patent: 3160463 (1964-12-01), Moscarini
patent: 4148027 (1979-04-01), Nowogrodzki
patent: 4417641 (1983-11-01), Kageyama

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