Apparatus for estimating friction coefficient of road surface and method thereof
AssigneesHyundai Motor Company, Kia Motors Corporation
InventorNam Han Kim
Life of this patent
Estimating the term…
Abstract
An apparatus for estimating a friction coefficient of a road surface is provided. The apparatus includes a current sensor configured to measure a control current value of a rear wheel steering (RWS) motor, a stroke sensor configured to measure a stroke value indicating a movement amount of a rear wheel steering link, and a controller configured to estimate the friction coefficient of the road surface based on the control current value measured by the current sensor and the stroke value measured by the stroke sensor.
Claims20
An apparatus for estimating a friction coefficient of a road surface, the apparatus comprising:
- a current sensor configured to measure a control current value of a rear wheel steering (RWS) motor;
- a stroke sensor configured to measure a stroke value indicating a movement amount of a rear wheel steering link;
- and
- a controller configured to estimate the friction coefficient of the road surface based on the control current value measured by the current sensor and the stroke value measured by the stroke sensor,
- wherein the RWS motor is configured to steer the rear wheel based on the control current value.
A method of estimating a friction coefficient of a road surface, the method comprising:
- measuring a control current value of a rear wheel steering (RWS) motor, the RWS motor steering the rear wheel based on the control current value;
- measuring a stroke value indicating a movement amount of a rear wheel steering link;
- and
- estimating the friction coefficient of the road surface based on the measured control current value and the measured stroke value.
An apparatus for estimating a friction coefficient of a road surface, the apparatus comprising:
- a first current sensor configured to measure a first control current value of a left rear wheel steering (RWS) motor;
- a first stroke sensor configured to measure a first stroke value indicating a movement amount of a left rear wheel steering link;
- a second current sensor configured to measure a second control current value of a right RWS motor;
- a second stroke sensor configured to measure a second stroke value indicating a movement amount of a right rear wheel steering link;
- and
- a controller configured to estimate a friction coefficient of a first road surface based on the first control current value measured by the first current sensor and the first stroke value measured by the first stroke sensor, estimate a friction coefficient of a second road surface based on the second control current value measured by the second current sensor and the second stroke value measured by the second stroke sensor, and estimate a friction coefficient of a final road surface using the friction coefficient of the first road surface and the friction coefficient of the second road surface,
- wherein the left RWS motor is configured to steer the left rear wheel based on the first control current value, and
- wherein the right RWS motor is configured to steer the right rear wheel based on the second control current value.
Dependencies are inferred from the claim text.