WHEEL LIFT IDENTIFICATION FOR AN AUTOMOTIVE VEHICLE
First Claim
1. A method of controlling an automotive vehicle comprising:
- detecting a potential for a wheel lift;
determining a wheel lift pressure request to determine wheel lift;
generating a roll control pressure request; and
suppressing the wheel lift pressure request in response to the roll control pressure request.
1 Assignment
0 Petitions
Accused Products
Abstract
A roll control system (16) for an automotive vehicle (10) is used to detect if one of the plurality of wheels (12) is lifted. The system generates a pressure request to determine if the wheel has lifted. A roll control pressure request may also be generated. The wheel lift pressure is suppressed in response to the roll control pressure request. The system may also store a peak wheel speed after the initiation of a build cycle so that the peak wheel speed is used in the wheel lift determination. Also, the system may have an ABS monitor mode which uses the build and release cycles of the ABS system to determine whether a wheel has lifted.
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Citations
33 Claims
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1. A method of controlling an automotive vehicle comprising:
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detecting a potential for a wheel lift;
determining a wheel lift pressure request to determine wheel lift;
generating a roll control pressure request; and
suppressing the wheel lift pressure request in response to the roll control pressure request. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of controlling a vehicle having a hydraulic circuit coupled to a first wheel and a second wheel comprising:
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initiating build request in response to a suspected wheel lift for the first wheel of the hydraulic circuit;
generating a roll control pressure request for a second wheel of the hydraulic circuit; and
entering a release cycle for the wheel lift pressure request when the roll control pressure request is above a predetermined threshold. - View Dependent Claims (9, 10)
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11. A method of operating an automotive vehicle comprising:
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initiating a build cycle;
storing a peak wheel speed after initiating the build cycle;
determining a second wheel speed to determine a change in wheel speed from the peak speed; and
determining a wheel lift status when the change in the wheel speed is greater than a predetermined value. - View Dependent Claims (12, 13, 14)
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15. A method of operating an automotive vehicle comprising:
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initiating a build cycle;
storing a peak wheel speed after initiating the build cycle;
determining a second wheel speed to determine a change in wheel speed from the peak speed; and
choosing between a first or second lift status in response to the change in wheel speed. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A method of controlling an automotive vehicle comprising:
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initiating a build cycle;
after the build cycle, initiating a release cycle; and
determining one of an absolutely grounded, possibly grounded condition, an absolutely lifted or possibly lifted condition during one of the build cycle or the release cycle.
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28. A method of operating an automotive vehicle having an antilock brake system comprising:
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initiating an antilock brake monitor mode when the roll control system suspects lift and the driver is braking above a small minimum pressure level; and
determining wheel lift in response to the level of wheel deceleration generated while the pressure is being released in the antilock brake monitor mode. - View Dependent Claims (29)
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30. A method of controlling an automotive vehicle comprising:
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initiating an antilock brake monitor mode having a release cycle;
determining a change in wheel speed; and
determining a wheel lift or wheel grounded condition in response to the change in wheel speed. - View Dependent Claims (31, 32, 33)
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Specification