Adaptive traction control system
First Claim
1. A method for controlling a traction control system, comprising:
- adapting, using a controller, a ratio representing a driven wheel speed to a reference wheel speed before inputting the ratio to the traction control system,wherein adapting the ratio comprises applying a first adaptation filter constant or a second adaptation filter constant, which differs from the first adaptation filter constant, to the ratio; and
controlling the traction control system in response to the adapted ratio.
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Abstract
A method of controlling a traction control system (30) includes continuously adapting a steady state driven wheel speed to reference wheel speed ratio, so that said traction control system can avoid unnecessary actuations (e.g., demanding torque reduction). The continuous adaptation methodology provides traction control robustness to vehicles equipped with a spare tire, or a different final drive such as in the use of aftermarket parts. The method includes a dual rate adaptation that allows both fast adaptation and fine tuning capabilities of the ratio. The method includes comparing the instant driven wheel speed to reference wheel speed ratio to the filtered driven wheel speed to reference wheel speed ratio, to obtain a ratio difference. When the difference is above a threshold, the first filter constant is selected and the first constant is applied to an adaptation filter, resulting in a first filtered and adapted ratio. The traction control system is controlled with the adapted ratio. When the difference is below the threshold, the second filter constant is selected and the selected constant is applied to the adaptation filter, resulting in the second filtered and adapted ratio. The traction control system is controlled with the adapted ratio.
52 Citations
12 Claims
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1. A method for controlling a traction control system, comprising:
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adapting, using a controller, a ratio representing a driven wheel speed to a reference wheel speed before inputting the ratio to the traction control system, wherein adapting the ratio comprises applying a first adaptation filter constant or a second adaptation filter constant, which differs from the first adaptation filter constant, to the ratio; and controlling the traction control system in response to the adapted ratio. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for controlling a traction control system comprising:
- operating, using a controller, the traction control system in response to
an instant wheel speed ratio representing a ratio of a speed of driven wheels to a reference wheel speed, and previously determined wheel speed ratio derived from a predetermined filter value and the ratio of the speed of driven wheels to the reference wheel speed. - View Dependent Claims (9, 10, 11, 12)
- operating, using a controller, the traction control system in response to
Specification