Method and system for calibrating a vehicle speed
First Claim
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1. A system for calibrating speed of a vehicle having a plurality of wheels, the system comprising:
- a wheel speed sensor coupled to each of the wheels for providing a first vehicle speed based on an average tire size associated with the plurality of wheels;
a GPS sensor for providing a second vehicle speed; and
a control module configured to automatically calibrate a speed of the vehicle by (a) sensing an ignition on of the vehicle, (b) comparing the first and second vehicle speeds, (c) calibrating the speed of the vehicle by calculating an adjustment to the average tire size as a function of the first and second vehicle speed comparison, and (d) automatically repeating (b)-(d) so long as the ignition of the vehicle remains on.
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Abstract
A method and system for calibrating speed of a vehicle having a plurality of wheels includes a wheel speed sensor coupled to each of the wheels for providing a first vehicle speed based on an average tire size associated with the plurality of wheels. A GPS sensor provides a second vehicle speed based on a change in position of the vehicle over a predetermined period of time. A control module automatically calibrates the speed of the vehicle based on a comparison of the first and second vehicle speeds.
11 Citations
15 Claims
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1. A system for calibrating speed of a vehicle having a plurality of wheels, the system comprising:
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a wheel speed sensor coupled to each of the wheels for providing a first vehicle speed based on an average tire size associated with the plurality of wheels; a GPS sensor for providing a second vehicle speed; and a control module configured to automatically calibrate a speed of the vehicle by (a) sensing an ignition on of the vehicle, (b) comparing the first and second vehicle speeds, (c) calibrating the speed of the vehicle by calculating an adjustment to the average tire size as a function of the first and second vehicle speed comparison, and (d) automatically repeating (b)-(d) so long as the ignition of the vehicle remains on. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for calibrating speed of a vehicle having a plurality of wheels, the method comprising:
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sensing a first vehicle speed based on an average tire size associated with the plurality of wheels; sensing a second vehicle speed based on global positioning data; and automatically calibrating the speed of the vehicle by (a) Sensing an ignition of the vehicle; (b) Comparing the first and second vehicle speeds; (c) Calculating a new average tire size correction as a function of the first and the second vehicle speeds comparison. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method for calibrating speed of a vehicle having a plurality of wheels, the method comprising:
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(a) sensing a first vehicle speed based on an average tire size associated with the plurality of vehicle wheels; (b) sensing a second vehicle speed based on global positioning data; (c) calculating a vehicle tire size error using the first and second vehicle speeds; (d) comparing the calculated vehicle tire size error against a predetermined vehicle tire size error threshold; (e) calculating a vehicle tire size error correction term using the calculated vehicle tire size error if the predetermined vehicle tire size error threshold is exceeded; and (f) calculating a new average tire size using the vehicle tire size error correction term if the predetermined vehicle tire size error threshold was exceeded. - View Dependent Claims (14, 15)
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Specification