Vehicle wheel lift detection
First Claim
Patent Images
1. A system for detecting if a wheel of a vehicle has lifted off of the ground, said system comprising:
- a separate wheel speed sensor for determining the speed of each wheel of the vehicle, each of the wheel speed sensors providing a wheel speed signal;
a plurality of suspension sensors for measuring a position of a vehicle suspension at each of the wheels of the vehicle, each of the suspension sensors providing a suspension signal; and
a controller responsive to the wheel speed signals and the suspension signals, said controller determining whether any of the wheels are off of the ground by using the wheel signals or the suspension signals.
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Abstract
A system and method for detecting vehicle wheel lift. The system includes wheel speed sensors for measuring the speed of each wheel of the vehicle, and suspension sensors for measuring the position of the vehicle suspension at each wheel of the vehicle. A controller determines whether any of the wheels are off the ground by using a kinematic relationship that uses the wheel speed signals and independently determines whether any of the wheels are off the ground by using damper spring displacement from the suspension sensors.
20 Citations
20 Claims
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1. A system for detecting if a wheel of a vehicle has lifted off of the ground, said system comprising:
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a separate wheel speed sensor for determining the speed of each wheel of the vehicle, each of the wheel speed sensors providing a wheel speed signal;
a plurality of suspension sensors for measuring a position of a vehicle suspension at each of the wheels of the vehicle, each of the suspension sensors providing a suspension signal; and
a controller responsive to the wheel speed signals and the suspension signals, said controller determining whether any of the wheels are off of the ground by using the wheel signals or the suspension signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 12, 13)
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10. A system for detecting if a wheel of a vehicle has lifted off of the ground, said system comprising:
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a lateral acceleration sensor for measuring the lateral acceleration of the vehicle and providing a lateral acceleration signal;
a yaw rate sensor for measuring the yaw rate of the vehicle and providing a yaw rate signal;
a separate wheel speed sensor for determining the speed of each wheel of the vehicle, each of the wheel speed sensors providing a wheel speed signal;
a plurality of suspension displacement sensors for measuring the displacement of a vehicle suspension at each of the wheels, each of the suspension displacement sensors providing a suspension displacement signal; and
a controller responsive to the lateral acceleration signal, the yaw rate signal, the wheel speed signals and the suspension signals, said controller using a kinematic relationship including the yaw rate signal, the wheel speed signals and a track distance between opposing right and left wheels to provide an indication of whether wheel lift is occurring, said controller further determining if any of the wheels are off of the ground by determining if the suspension signal at any of the wheels is close enough to a predetermined critical suspension position, wherein the controller only determines if wheel lift is occurring if the lateral acceleration signal is greater than a predetermined threshold. - View Dependent Claims (11, 14)
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15. A method for determining if a wheel of a vehicle has lifted off of the ground, said method comprising:
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determining the speed of each wheel of the vehicle;
determining the position of a vehicle suspension at each wheel of the vehicle;
determining that a potential wheel lift condition exists for any of the wheels using a kinematic relationship based on wheel speed; and
determining that a potential wheel lift is occurring based on how close the suspension position of any of the vehicle suspensions is to a critical position. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification