System for controlling a power transmission of a four-wheel driv

Details System for controlling a power transmission of a four-wheel driv System for controlling a power transmission of a four-wheel driv

1983-04-12

1985-12-10

Gruber, Felix D.

Boots, shoes, and leggings

180197, 180233, B60K 1734, B60K 2308

Patent

active

045584141

ABSTRACT:
A system for a four-wheel drive vehicle for automatically changing a power transmission system of the engine of the vehicle from two-wheel driving to four-wheel driving in accordance with driving conditions. The transmission system transmits power from the engine to main wheels, and a clutch is provided for transmitting the power of the engine to auxiliary wheels. A speed sensor is provided for producing output signals dependent on speed of the main wheels. A first computing circuit is provided for producing a vehicle speed signal from the output signals of the speed sensor, and a second computing circuit is provided for producing an angular acceleration signal from the output signals of the speed sensor. A comparing circuit is provided for comparing the angular acceleration signal and a reference value with each other and for producing an output signal when the angular acceleration signal is higher than the reference value. The reference value is decreased as the vehicle speed increases. The output signal of the comparing circuit is applied to a switch to engage the clutch, whereby the four-wheel driving power transmission is established.

REFERENCES:
patent: 4433748 (1984-02-01), Satoh et al.
patent: 4466502 (1984-08-01), Sakai
patent: 4484653 (1984-11-01), Hirokoshi et al.

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