Method and apparatus for controlling four-wheel drive vehicles

Details Method and apparatus for controlling four-wheel drive vehicles Method and apparatus for controlling four-wheel drive vehicles

1987-04-17

1988-09-20

Pekar, John A.

Motor vehicles

Having four wheels driven

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

74866, 74878, 3644241, B60K 1734

Patent

active

047718536

ABSTRACT:
Herein disclosed is a method and apparatus for controlling a four-wheel drive vehicle wherein said method hydraulically controls a distribution of a drive force between the front and rear wheels of a four-wheel drive vehicle and a change of the gear ratio of an automatic transmission of the vehicle. After either the drive force distribution control or the gear ratio change control has been started, the other control is forbidden until a predetermined condition is satisfied. This control is either the lapse of a predetermined period of time or the end of one of the controls which is determined by the result of a comparison of the number of revolutions of the transmission or the result of a comparison of the hydraulic pressure.

REFERENCES:
patent: 4407387 (1983-10-01), Lindbert
patent: 4452331 (1984-06-01), Lunn et al.
patent: 4688449 (1987-08-01), Harada et al.

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