Vehicle stability control system and method
First Claim
1. A method for controlling vehicle stability with a controller, the method comprising:
- applying brake pressure at a wheel at an outside corner of the vehicle when the vehicle is oversteering;
applying brake pressure at a wheel at an inside corner of the vehicle when the vehicle is understeering; and
applying brake pressure to the vehicle'"'"'s rear wheels when application of brake pressure at the outside corner wheel or inside corner wheel does not make an actual vehicle response close enough to a target vehicle response,wherein the target vehicle response is derived from at least a steering wheel angle and a vehicle speed, and the actual vehicle response is based on a vehicle yaw rate or a vehicle sideslip gradient and sideslip angle.
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Accused Products
Abstract
A method and system for controlling vehicle stability may comprise determining whether a vehicle is oversteering or understeering and, if the vehicle is oversteering or understeering, determining an amount by which to reduce a speed of the vehicle to correct for understeering or oversteering and applying brake pressure to at least the rear brakes of the vehicle to reduce vehicle speed. The method and system also may comprise determining an engine torque reduction amount based on vehicle oversteer or understeer conditions, reducing engine torque by the determined amount or to zero if the determined amount of engine torque reduction is greater than an actual engine torque, and applying braking to at least the rear brakes of the vehicle if the determined amount of engine torque reduction is greater than the actual engine torque.
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Citations
16 Claims
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1. A method for controlling vehicle stability with a controller, the method comprising:
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applying brake pressure at a wheel at an outside corner of the vehicle when the vehicle is oversteering; applying brake pressure at a wheel at an inside corner of the vehicle when the vehicle is understeering; and applying brake pressure to the vehicle'"'"'s rear wheels when application of brake pressure at the outside corner wheel or inside corner wheel does not make an actual vehicle response close enough to a target vehicle response, wherein the target vehicle response is derived from at least a steering wheel angle and a vehicle speed, and the actual vehicle response is based on a vehicle yaw rate or a vehicle sideslip gradient and sideslip angle. - View Dependent Claims (2, 3, 4, 5)
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6. A method for controlling vehicle stability with a controller, the method comprising:
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applying brake pressure at a wheel at an outside corner of the vehicle when the vehicle is oversteering;
p1 applying brake pressure at a wheel at an inside corner of the vehicle when the vehicle is understeering; andapplying brake pressure at all four vehicle wheels when application of brake pressure at the outside corner wheel or inside corner wheel does not make an actual vehicle response close enough to a target vehicle response, wherein the target vehicle response is derived from at least a steering wheel angle and a vehicle speed, and the actual vehicle response is based on a vehicle yaw rate or a vehicle sideslip gradient and sideslip angle.
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7. A method for controlling vehicle stability with a controller, the method comprising:
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applying brake pressure at a wheel at an outside corner of the vehicle when the vehicle is oversteering; applying brake pressure at a wheel at an inside corner of the vehicle when the vehicle is understeering; and reducing engine torque when application of brake pressure at the outside corner wheel or inside corner wheel does not make an actual vehicle response close enough to a target vehicle response, wherein the target vehicle response is derived from at least a steering wheel angle and a vehicle speed, and the actual vehicle response is based on a vehicle yaw rate or a vehicle sideslip gradient and sideslip angle. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification