Vehicle control of a locked drive system
First Claim
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1. A vehicle, comprising:
- a first wheel;
a second wheel mechanically coupled to the first wheel;
a locking drive differential mechanically coupled to the second wheel;
a third wheel mechanically coupled to the locked drive differential; and
a stability controller coupled to the third wheel, the stability controller being programmed to attain a slip rate at the third wheel that is about equal to the sum of slip rates at the first wheel and the second wheel when stabilizing the vehicle in an over-steer condition.
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Abstract
A vehicle includes multiple wheels, a locking drive differential, and a stability controller. A first wheel is mechanically coupled to a second wheel. The locking drive differential mechanically couples the second wheel to a third wheel. The stability controller is coupled to the third wheel. The stability controller is programmed to attain a slip rate of about the first and the second wheel at the third wheel, which stabilizes the vehicle in an over-steer condition. The method applies a modulated stability pressure to the third wheel until the third wheel attains about the combined slip rate of the first wheel and the second wheel and a fourth wheel is rotating at about the velocity of the vehicle.
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Citations
22 Claims
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1. A vehicle, comprising:
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a first wheel;
a second wheel mechanically coupled to the first wheel;
a locking drive differential mechanically coupled to the second wheel;
a third wheel mechanically coupled to the locked drive differential; and
a stability controller coupled to the third wheel, the stability controller being programmed to attain a slip rate at the third wheel that is about equal to the sum of slip rates at the first wheel and the second wheel when stabilizing the vehicle in an over-steer condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A vehicle, comprising:
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a first wheel;
a second wheel mechanically coupled to the first wheel;
a locking drive differential mechanically coupled to the second wheel;
a third wheel mechanically coupled to the locking drive differential;
a fourth wheel mechanically coupled to the locking drive differential; and
a controller coupled to the third wheel, the controller being configured to assign a slip rate to the third wheel that is about equal to the sum of slip rates at the first wheel and the second wheel and to use an inverse braking strategy to achieve the assigned slip rate at the third wheel for stabilizing the vehicle in an over-steer condition. - View Dependent Claims (16)
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17. A method of stabilizing a vehicle in an over-steer condition, said vehicle comprising wheels mechanically coupled to a locking drive differential, said method comprising:
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detecting an over-steer condition;
assigning brake control priority to a first wheel and a fourth wheel;
assigning stability control priority to a second wheel and a third wheel; and
applying braking pressure to the third wheel until the third wheel attains a slip rate about equal to the sum of the slip rates of the first wheel and the second wheel where the fourth wheel is rotating at about a velocity of the vehicle. - View Dependent Claims (18, 19, 20)
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21. A stability controller for a vehicle comprising a locking drive differential and a first wheel, a second wheel, a third wheel and a fourth wheel mechanically coupled to the locking drive differential;
- said stability controller comprising;
a logic circuit;
a memory interfaced to the logic circuit; and
software comprising instructions that may be executed by the logic circuit to stabilize the vehicle in an over-steer condition by attaining a slip rate at the third wheel about equal to the sum of slip rates at the first and second wheels. - View Dependent Claims (22)
- said stability controller comprising;
Specification