Four-wheel drive vehicle

Details Four-wheel drive vehicle Four-wheel drive vehicle

1985-10-03

1987-05-12

Love, John J.

Motor vehicles

Having four wheels driven

180169, 3644241, B60K 1734, B60K 2308

Patent

active

046642161

ABSTRACT:
A system for controlling power transmission of a four-wheel drive vehicle having main driving wheels of the vehicle powered by an engine. A clutch transmits the power of the engine to auxiliary driving wheels of the vehicle so as to provide forward drive. A transmitter transmits a high frequency wave to a surface of a road in front of the vehicle and a receiver receives the reflected wave. A comparator is provided for comparing the received wave with the transmitted wave. When the difference between the amplitudes of both waves exceeds a reference value, a control circuit engages the clutch for the four-wheel drive.

REFERENCES:
patent: 3625303 (1971-12-01), Cameron
patent: 4417641 (1983-11-01), Kageyama
patent: 4456829 (1984-06-01), Fohey
patent: 4511014 (1985-04-01), Makita
patent: 4513833 (1985-04-01), Sheldon
patent: 4556134 (1985-12-01), Takano

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