Apparatus for controlling the distribution of drive power for mo

Details Apparatus for controlling the distribution of drive power for mo Apparatus for controlling the distribution of drive power for mo

1990-04-25

1991-10-15

Hill, Mitchell J.

Motor vehicles

Having four wheels driven

With differential means for driving two wheel sets at...

192 85R, B60K 17348

Patent

active

050566148

ABSTRACT:
An apparatus for controlling the distribution of drive power in an all-wheel-drive motor vehicle which has main drive wheels, auxiliary drive wheels, and a drive power transmitting system for transmitting the drive power to the auxiliary drive wheels. The apparatus has a hydraulic pressure source, a hydraulic system, a hydraulic clutch disposed in the drive power transmitting system, which varies the drive power transmitted to the auxiliary drive wheels, depending on the hydraulic pressure supplied from the hydraulic pressure source to the hydraulic clutch through the hydraulic system, and a control system for controlling the ratio at which the drive power is distributed between the main and auxiliary drive wheels, through regulation of the hydraulic pressure supplied from the hydraulic pressure source to the hydraulic clutch. The apparatus further includes a failure detecting system for detecting a failure of the hydraulic system, and a hydraulic pressure lowering system for lowering the hydraulic pressure supplied from the hydraulic pressure source to the hydraulic clutch when a failure of the hydraulic system is detected by the failure detecting system.

REFERENCES:
patent: 4681180 (1987-07-01), Oyama et al.

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