Pressure, tire force and friction estimation during antilock control
A method for estimating a brake pressure, a longitudinal tire force and a tire-road μ during periods of antilock control that measures deceleration of a wheel during a period of constant brake pressure, reduces a brake pressure to cause slip on the wheel to begin reducing, measures reacceleration of...
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| Main Author | |
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| Format | Patent |
| Language | English |
| Published |
07.08.2012
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| Online Access | Get full text |
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| Summary: | A method for estimating a brake pressure, a longitudinal tire force and a tire-road μ during periods of antilock control that measures deceleration of a wheel during a period of constant brake pressure, reduces a brake pressure to cause slip on the wheel to begin reducing, measures reacceleration of the wheel after a point in time in which the change in brake pressure is completed, calculates a change in acceleration based on the measured reacceleration and the measured deceleration, estimates a change in brake pressure from a proportional relationship between the change in acceleration and a brake pressure value, estimates a brake pressure from the relationship between a time for valve activation during a change in acceleration and the change in brake pressure. The method also estimates a longitudinal tire force from a mathematical relationship between the change in acceleration, a tire radius, and the estimated brake pressure. The method also estimates tire-road μ by dividing a normal tire force by the estimated longitudinal tire force. |
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