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Wheel diameter calibration system for vehicle slip/slide control
| Details |
Inventors: Kumar, Ajith Kuttannair; Worden, Bret Dwayne;
Assignee: General Electric Company (Erie, PA)
Primary Examiner: Noland; Thomas P.
Assistant Examiner:
Attorney, Agent or Firm: Breedlove; Jill, Beuss; James
A method and apparatus for wheel diameter calibration in a vehicle of the type having a plurality of independently powered wheel-axle sets which can be implemented as a forced calibration while the vehicle is in either a tractive effort or an electrical braking mode. The process includes the steps of determining if vehicle tractive effort would be effected if one wheel-axle set were disabled and, if not, selectively disabling one of the wheel-axle sets, calculating vehicle speed from a present value of wheel diameter for the disabled axle and wheel revolutions per unit time, establishing a true value of vehicle speed from an independent measurement, computing the error between calculated vehicle speed and the true value of vehicle speed, and adjusting the present value of wheel diameter so as to minimize the computed speed error. |
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DETAILED DESCRIPTION The present invention is implemented in one form in which a wheel diameter calibration system for a traction vehicle having a plurality of independently powered wheel-axle sets, such as a locomotive, which system allows wheel diameter to be calibrated while the vehicle is in either a tractive effort or electrical braking mode of operation.
In the illustrative system, calibration of each wheel-axle set is accomplished by systematically removing power from each wheel-axle set to place that wheel-axle set in a coast mode.
The vehicle control initially determines whether a calibration is needed by comparing vehicle velocity as determined by an independent sensor, such as a radar or GPS sensor, to vehicle velocity as determined from a calculation of vehicle speed based upon wheel rotational speed and wheel diameter.
If the velocities differ by more than some minimum value, a forced calibration mode is entered.
In the forced calibration mode, the control determines first if vehicle tractive effort would be effected if one wheel-axle set were disabled.
If not, the one wheel-axle set is disabled, with the commanded tractive effort being distributed over the remaining powered wheel-axle sets.
The control thereafter integrates the velocity difference or error while continuously re-computing the error wherein the integrated error value becomes the value of wheel diameter.
The control can interrupt the calibration process whenever the disabled wheel-axle set is needed to meet tractive effort requirements.
During any interruption in calibration, the last computed value of wheel diameter is maintained so that future calibrations start from the last value thereby allowing calibration to be performed in discontinuous, piecemeal fashion.
The control can also accelerate the integration process to perform faster calibration by varying the velocity error signal magnitude by multiplying the error signal by a selectable factor.
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Navigation and GPS 
