Motor vehicles – Having four wheels driven – With differential means for driving two wheel sets at...
Patent
1990-04-27
1992-03-31
Marmor, Charles A.
Motor vehicles
Having four wheels driven
With differential means for driving two wheel sets at...
3644241, B60K 1735
Patent
active
050999443
ABSTRACT:
A planetary gear device as a central differential distributes an output torque of a transmission to the front wheels and the rear wheels of a four-wheel drive motor vehicle. A fluid operated clutch is provided between a sun gear and a ring gear of the planetary gear device. A desired speed ratio between front-wheel speed and rear-wheel speed at cornering is calculated based on vehicle speed and steering angle of the vehicle. A torque distribution ratio is determined in accordance with a difference between the desired speed ratio and an actual speed ratio between the front-wheel speed and the rear-wheel speed. The clutch pressure is controlled in response to the torque distribution ratio for engaging the clutch so that the average speed ratio coverages to the desired speed ratio.
REFERENCES:
patent: 4754835 (1988-07-01), Stelter et al.
patent: 4805721 (1989-02-01), Takahashi et al.
patent: 4840247 (1989-06-01), Kashihara et al.
patent: 4866624 (1989-09-01), Nishikawa et al.
patent: 4884653 (1989-12-01), Kouno
patent: 4936406 (1990-06-01), Tezuka et al.
Kageyama Hayashi
Oobayashi Shingo
Shibuya Makoto
Tezuka Kazunari
Farber Martin A.
Fuji Jukogyo Kabushiki Kaisha
Hurley Kevin
Marmor Charles A.
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