Misalignment detection system for a steering system of an automotive vehicle
First Claim
1. A misalignment detection system for a steering system comprising:
- a velocity sensor generating a vehicle velocity signal indicative of a vehicle velocity;
a yaw rate sensor generating a yaw rate signal indicative of a vehicle yaw rate;
a memory of storing a steering ratio memory map and a historic steering wheel angle; and
a controller coupled to the velocity sensor, the yaw rate sensor and the memory, the controller determining a base steering wheel angle when vehicle velocity is at a predetermined velocity, said base steering wheel angle being a function of vehicle velocity, yaw rate and a steering ratio, said controller comparing said base steering wheel angle with a historic steering wheel angle to determine an error.
2 Assignments
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Accused Products
Abstract
A misalignment detection system (12) for steering system of an automotive vehicle (10) includes a controller (14) coupled to a velocity sensor (18), and a yaw rate sensor (20). The controller is also coupled to a memory (16) that is used to store a steering ratio memory map and a historic steering wheel angle. The controller (14) determines a base steering wheel angle when the vehicle velocity is at a predetermined velocity. The base steering wheel angle is a function of the vehicle velocity, the yaw rate, and the steering ratio. The controller compares the current steering wheel angle with a historic steering wheel angle to determine an error. An indicator (22) may be provided to the vehicle operator to signal the presence of the misalignment of the steering system.
15 Citations
19 Claims
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1. A misalignment detection system for a steering system comprising:
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a velocity sensor generating a vehicle velocity signal indicative of a vehicle velocity;
a yaw rate sensor generating a yaw rate signal indicative of a vehicle yaw rate;
a memory of storing a steering ratio memory map and a historic steering wheel angle; and
a controller coupled to the velocity sensor, the yaw rate sensor and the memory, the controller determining a base steering wheel angle when vehicle velocity is at a predetermined velocity, said base steering wheel angle being a function of vehicle velocity, yaw rate and a steering ratio, said controller comparing said base steering wheel angle with a historic steering wheel angle to determine an error. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of detecting misalignment of the steering system of an automotive vehicle comprising the steps of:
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determining a base steering wheel angle at a predetermined vehicle speed;
determining an error between the base steering wheel angle and a historic steering wheel angle; and
indicating a misalignment when said error is greater than a predetermined error. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A method of detecting misalignment of the steering system of an automotive vehicle comprising the steps of:
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detecting a vehicle speed;
detecting a vehicle yaw rate;
determining a base steering wheel angle at a predetermined vehicle speed as a function of yaw rate;
determining an error between the base steering wheel angle and a historic steering wheel angle; and
indicating an error if the error is above a predetermined level. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification