Speed control system and method of operating the same
First Claim
1. A method of operating an off-highway speed control system of a vehicle, the method comprising:
- identifying a terrain type;
identifying a pattern or change in at least one component of vehicle drag based at least in part on the terrain type, wherein the identifying of the pattern or change in at least one component of vehicle drag based at least in part on the terrain type comprises determining that the vehicle is transitioning from one surface type having a first surface coefficient of friction and rolling resistance to a further surface type having a second surface coefficient of friction and rolling resistance;
monitoring vehicle speed to predict where a change in said at least one component of vehicle drag as a result of the determined transition from the one surface type to the further surface type may result in a speed overshoot event or a speed undershoot event; and
in response to said predicted speed overshoot event or speed undershoot event, automatically commanding an application of an appropriate opposing torque to one or more wheels of the vehicle to counteract said predicted speed overshoot event or undershoot event.
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Accused Products
Abstract
A method for operating an off-road speed control system of a vehicle is provided. The method comprises identifying a pattern or change in at least one component of vehicle drag. The method further comprises monitoring vehicle speed to predict where a change in the at least one component of vehicle drag may result in a speed overshoot event or a speed undershoot event. The method still further comprises, in response to the predicted speed overshoot event or speed undershoot event, automatically commanding the application of an appropriate opposing torque to one or more wheels of the vehicle to counteract the predicted speed overshoot or undershoot. An off-road speed control system for a vehicle comprising an electronic control unit (ECU) configured to perform the above-described methodology is also provided.
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Citations
21 Claims
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1. A method of operating an off-highway speed control system of a vehicle, the method comprising:
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identifying a terrain type; identifying a pattern or change in at least one component of vehicle drag based at least in part on the terrain type, wherein the identifying of the pattern or change in at least one component of vehicle drag based at least in part on the terrain type comprises determining that the vehicle is transitioning from one surface type having a first surface coefficient of friction and rolling resistance to a further surface type having a second surface coefficient of friction and rolling resistance; monitoring vehicle speed to predict where a change in said at least one component of vehicle drag as a result of the determined transition from the one surface type to the further surface type may result in a speed overshoot event or a speed undershoot event; and in response to said predicted speed overshoot event or speed undershoot event, automatically commanding an application of an appropriate opposing torque to one or more wheels of the vehicle to counteract said predicted speed overshoot event or undershoot event. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An off-highway speed control system for a vehicle, comprising an electronic control unit (ECU), the ECU configured to:
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identify a terrain type; identify a pattern or change in at least one component of vehicle drag based at least in part on the terrain type, wherein the identifying of the pattern or change in at least one component of vehicle drag based at least in part on the terrain type comprises determining that the vehicle is transitioning from one surface type having a first surface coefficient of friction and rolling resistance to a further surface type having a second surface coefficient of friction and rolling resistance; monitor vehicle speed; predict where a change in said at least one component of vehicle drag may result in a speed overshoot event or a speed undershoot event as a result of the determined transition from the one surface type to the further surface type; and in response to said predicted speed overshoot event or speed undershoot event, automatically command an application of an appropriate opposing torque to one or more wheels of the vehicle to counteract said predicted speed overshoot event or undershoot event. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A vehicle comprising an off-highway speed control system, wherein said speed control system comprises an electronic control unit (ECU), the ECU configured to:
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identify a terrain type; identify a pattern or change in at least one component of vehicle drag based at least in part on the terrain type, wherein the identifying of the pattern or change in at least one component of vehicle drag based at least in part on the terrain type comprises determining that the vehicle is transitioning from one surface type having a first surface coefficient of friction and rolling resistance to a further surface type having a second surface coefficient of friction and rolling resistance; monitor vehicle speed; predict where a change in said at least one component of vehicle drag may result in a speed overshoot event or a speed undershoot event as a result of the determined transition from the one surface type to the further surface type; and in response to said predicted speed overshoot event or speed undershoot event, automatically command an application of an appropriate opposing torque to one or more wheels of the vehicle to counteract said predicted speed overshoot event or undershoot event.
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Specification