Motor vehicles – Having four wheels driven – With differential means for driving two wheel sets at...
Patent
1989-08-31
1991-05-14
Mitchell, David M.
Motor vehicles
Having four wheels driven
With differential means for driving two wheel sets at...
180197, 180233, 36442603, B60K 17344
Patent
active
050148095
ABSTRACT:
A control system for a 4WD vehicle includes a transfer clutch capable of continuously varying a driving torque distribution ratio between front and rear axles, and a controller for producing a control signal to control the distribution ratio. In order to improve the stability of the vehicle during deceleration, the control system is provided with a sensor for sensing one or more of an engine speed, a throttle opening, a transmission gear ratio, a vehicle speed and other vehicle operating parameters affecting engine braking, and a controller section for controlling the distribution ratio in accordance with the amount of engine braking at a level which is higher enough than the level of 2WD to adequately distribute the engine braking force between the front and rear axles and which is lower enough than the 4WD level to allow the front and rear axles to rotate at different speeds.
REFERENCES:
patent: 4754834 (1988-07-01), Ozaki et al.
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), Naito
patent: 4966250 (1990-10-01), Imaseki
Mitchell David M.
Nissan Motor Co,. Ltd.
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