Apparatus for estimating road friction coefficient
AssigneeFuji Jukogyo Kabushiki Kaisha
InventorMasaru Kogure
Life of this patent
Estimating the term…
Abstract
A friction coefficient on road is estimated for vehicles. An actual vehicle of a specific vehicle operating parameter is calculated. A first reference value of the vehicle operating parameter on a road with a large friction coefficient is calculated based on vehicle operating model for the road with the large friction coefficient. A second reference value of the vehicle operating parameter on a road with a small friction coefficient is calculated based on vehicle operating model for the road with the small friction coefficient. A friction coefficient on road is estimated based on the relationship between the actual value and the first and the second reference values.
Claims12
An apparatus for estimating a friction coefficient on a road for vehicles, the apparatus comprising:
- a vehicle operating parameter calculator to calculate a vehicle operating parameter based on vehicle operating conditions;
- a basic parameter calculator to calculate a basic parameter by inputting the vehicle operating parameter into a vehicle operating model;
- a first reference value calculator to calculate a first reference value by inputting the vehicle operating parameter into said vehicle operating model for the road with the large friction coefficient;
- a second reference value calculator to calculate a second reference value by inputting the vehicle operating parameter into said vehicle operating model for the road with the small friction coefficient;
- and
- an estimator to estimate a friction coefficient on road based on the basic parameter, the first reference value and the second reference value.
An apparatus for estimating a friction coefficient on road for vehicles, the apparatus comprising:
- a vehicle operating parameter calculator to calculate a vehicle operating parameter based on vehicle operating conditions;
- a basic parameter calculator to calculate a basic parameter of one of yaw rate and lateral acceleration and another actual value of a front wheel slip angle;
- a first reference value calculator to calculate a first reference value of one of the yaw rate and the lateral acceleration and a second reference value of the front wheel slip angle on a road with a large friction coefficient based on a vehicle operating model for the road with the large friction coefficient;
- a second reference value calculator to calculate a third reference value of one of the yaw rate and the lateral acceleration and a fourth reference value of the front wheel slip angle on a road with a small friction coefficient based on a vehicle operating model for the road with the small friction coefficient;
- and
- an estimator to estimate a first friction coefficient for a road based on the basic parameter and the first reference value on the road with the large friction coefficient and the third reference value on the road with the small fiction coefficient, and a second friction coefficient for a road based on the basic parameter and the second reference value on the road with the large friction coefficient and the fourth reference value on the road with the small fiction coefficient, either the first or the second fiction coefficient being employed according to predetermined requirements.
An apparatus for estimating friction coefficients on a road for vehicles, the apparatus comprising:
- a vehicle operating parameter calculator to calculate a vehicle operating parameter based on vehicle operating conditions;
- a basic parameter calculator to calculate a basic parameter of a front wheel slip angle;
- a first reference value calculator to calculate a first reference value of a front wheel slip angle on a road with a large friction coefficient based on a vehicle operating model for the road with the large friction coefficient;
- a second reference value calculator to calculate a second reference value of the front wheel slip angle on a road with a small friction coefficient based on a vehicle operating model for the road with the small friction coefficient;
- and
- an estimator to estimate a friction coefficient on road based on the basic parameter and the first reference value and the second reference value.
Dependencies are inferred from the claim text.