Driving-torque distribution control system for four-wheel drive vehicles
First Claim
1. A driving-torque distribution control system for a four-wheel drive vehicle, comprising:
- a transfer having a transfer clutch for variably adjusting a torque distribution between front and rear drive wheels;
sensor means for detecting an amount of shift of wheel-load from one of left and right wheels included in said secondary drive wheels to another;
weighting means responsive to said amount of shift of wheel-load for setting a weighting coefficient to a lower speed of rotational speeds of said left and right wheels included in said secondary drive wheels;
means for calculating a simple mean of rotational speeds of primary drive wheels, and for calculating a weighted mean of rotational speeds of said secondary drive wheels based on said weighting coefficient; and
means for controlling said transfer clutch in accordance with said torque distribution based on a difference between said simple mean and said weighted mean.
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Accused Products
Abstract
A driving-torque distribution control system for a four-wheel drive vehicle, comprises a transfer having a transfer clutch for variably adjusting a front and rear drive-wheel torque distribution, and a torque-split controller for setting a weighting coefficient to a lower speed of rotational speeds of secondary drive wheels depending on a wheel-load shift between the secondary drive wheels e.g. a lateral acceleration exerted on the vehicle or a rolling moment. The controller calculates a simple mean of rotational speeds of primary drive wheels, and also calculates a weighted mean of rotational speeds of the secondary drive wheels based on the weighting coefficient so as to control the transfer clutch in accordance with the front and rear drive-wheel torque distribution based on a difference between the simple mean and the weighted mean. The weighting coefficient is held constant until the lateral acceleration exceeds a predetermined threshold.
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Citations
5 Claims
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1. A driving-torque distribution control system for a four-wheel drive vehicle, comprising:
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a transfer having a transfer clutch for variably adjusting a torque distribution between front and rear drive wheels; sensor means for detecting an amount of shift of wheel-load from one of left and right wheels included in said secondary drive wheels to another; weighting means responsive to said amount of shift of wheel-load for setting a weighting coefficient to a lower speed of rotational speeds of said left and right wheels included in said secondary drive wheels; means for calculating a simple mean of rotational speeds of primary drive wheels, and for calculating a weighted mean of rotational speeds of said secondary drive wheels based on said weighting coefficient; and means for controlling said transfer clutch in accordance with said torque distribution based on a difference between said simple mean and said weighted mean. - View Dependent Claims (2, 3, 4)
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5. An active torque-split control system for a four-wheel drive vehicle, responsive to a wheel-speed difference between primary and secondary drive wheels for actively controlling a torque distribution of driving-torque produced by an engine between front and rear drive wheels, said system comprising:
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a transfer having a transfer clutch for variably adjusting said torque distribution; sensor means for detecting an amount of shift of wheel-load from an inner wheel of said secondary drive wheels to an outer wheel; selection means for selecting a lower speed of rotational speeds of said secondary drive wheels and a faster speed of the rotational speeds of said secondary drive wheels; weighting means responsive to said amount of shift of wheel-load for setting a weighting coefficient to said lower speed; means for calculating a representative rotational speed of said secondary drive wheels as a weighted mean based on said weighting coefficient when said amount of shift of wheel-load exceeds a predetermined threshold, and for calculating said representative rotational speed of said secondary drive wheels as a simple mean when said amount of shift of wheel-load is below said predetermined threshold; means for calculating a representative rotational speed of said primary drive wheels as a simple mean; and means for controlling said transfer clutch in accordance with said torque distribution based on a wheel speed difference between said representative rotational speed of said primary drive wheels and said representative rotational speed of said secondary drive wheels.
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Specification