Stability-enhanced traction control with electrically controlled center coupler
First Claim
1. A control system for a vehicle having first and second axles, comprising:
- a coupling apparatus adapted to distribute torque between the first and second axles;
a traction controller for controlling operation of the coupling apparatus from vehicle launch up to a predetermined vehicle speed, the traction controller configured to engage the coupling apparatus in a first vehicle operating state according to at least one vehicle operating parameter indicative of a low traction operating condition and to further control engagement of the coupling apparatus in a second vehicle operating state during the low traction operating condition according to a difference between an actual vehicle yaw rate and a predetermined target vehicle yaw rate; and
wherein the traction controller is configured to engage the coupling apparatus according to a desired coupling applied torque signal that is based on a modified normal coupling applied torque signal, the desired coupling applied torque signal is equal to the normal coupling applied torque signal multiplied by a modifier, the modifier including in its numerator the difference between a predetermined maximum yaw rate difference and the multiplication of a deadband and the difference between the actual vehicle yaw rate and the predetermined target vehicle yaw rate, and the modifier including in its denominator the predetermined maximum yaw rate difference.
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Accused Products
Abstract
A control system for a vehicle having first and second axles is provided that includes a coupling apparatus adapted to distribute torque between the first and second axles and a traction controller for controlling operation of the differential apparatus from vehicle launch up to a predetermined vehicle speed. The traction controller is configured to engage the coupling apparatus in a first operating state according to at least one vehicle operating parameter indicative of a low traction operating condition and to further control engagement of the coupling apparatus in a second vehicle operating state during the low traction operating condition according to a difference between an actual vehicle yaw rate and a predetermined target vehicle yaw rate.
28 Citations
4 Claims
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1. A control system for a vehicle having first and second axles, comprising:
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a coupling apparatus adapted to distribute torque between the first and second axles; a traction controller for controlling operation of the coupling apparatus from vehicle launch up to a predetermined vehicle speed, the traction controller configured to engage the coupling apparatus in a first vehicle operating state according to at least one vehicle operating parameter indicative of a low traction operating condition and to further control engagement of the coupling apparatus in a second vehicle operating state during the low traction operating condition according to a difference between an actual vehicle yaw rate and a predetermined target vehicle yaw rate; and wherein the traction controller is configured to engage the coupling apparatus according to a desired coupling applied torque signal that is based on a modified normal coupling applied torque signal, the desired coupling applied torque signal is equal to the normal coupling applied torque signal multiplied by a modifier, the modifier including in its numerator the difference between a predetermined maximum yaw rate difference and the multiplication of a deadband and the difference between the actual vehicle yaw rate and the predetermined target vehicle yaw rate, and the modifier including in its denominator the predetermined maximum yaw rate difference. - View Dependent Claims (2, 3, 4)
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Specification