Motor vehicles – Having four wheels driven
Patent
1990-04-10
1991-04-30
Hill, Mitchell J.
Motor vehicles
Having four wheels driven
180247, 180248, 3644241, B60K 1734
Patent
active
050109740
ABSTRACT:
A control system for a 4WD vehicle includes a drive system for directly transmitting a torque to primary drive wheels such as rear wheels, and transmitting a torque to secondary drive wheels such as front wheels through a torque distributing transfer clutch, a group of sensors for determining a front and rear wheel speed difference, an engine condition such as a throttle opening, and a vehicle speed, and a control unit for controlling the engagement force of the transfer clutch. Normally, the control unit employs a first control mode based on the front and rear wheel speed difference. In rapid acceleration to start the vehicle, the control unit replaces the first mode by a second mode in which the clutch engagement force is increased in accordance with the engine condition such as the throttle opening independent of the wheel speed difference, and thereby prevents undesired spin of the primary drive wheels without delay.
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patent: 4757870 (1988-07-01), Torii et al.
patent: 4773500 (1988-09-01), Naito et al.
patent: 4776424 (1988-10-01), Naito
patent: 4846298 (1989-07-01), Natio
patent: 4874056 (1989-10-01), Naito
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patent: 4890685 (1990-01-01), Naito
Hill Mitchell J.
Nissan Motor Co,. Ltd.
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