Physical quantity estimating apparatus and tire state determining apparatus, and estimating method of same and determination method of same
First Claim
1. A physical quantity estimating apparatus, comprising:
- an estimating portion that estimates at least one of a physical quantity relating to a tire radius of each wheel, a physical quantity relating to a road surface friction coefficient, and a physical quantity relating to a spring constant of a combination spring which combines spring elements, using a known value of a distribution ratio of a braking force and a driving force to each wheel and a known value of a distribution ratio of a load on each wheel, based on a wheel speed difference between any two wheels and the acceleration and deceleration rate of the vehicle during acceleration and deceleration of the vehicle.
1 Assignment
0 Petitions
Accused Products
Abstract
A physical quantity estimating apparatus and method that detects an acceleration and deceleration rate of a vehicle body and a rotational velocity of a wheel, estimates at least one of a tire radius of each wheel, a road surface μ gradient, and a spring constant of a combination spring which combines spring elements, with a distribution ratio of braking force and driving force to a front and rear wheel and a distribution ratio of a load on each wheel that is corrected according to the detected acceleration and deceleration rate, as known values, based on a wheel speed difference of any two wheels, during acceleration and deceleration of a vehicle, of an ideal vehicle model that takes into consideration a tire torsional spring element and a suspension longitudinal spring element and estimates a tire type based on the estimated road surface μ gradient and spring constant.
33 Citations
38 Claims
-
1. A physical quantity estimating apparatus, comprising:
an estimating portion that estimates at least one of a physical quantity relating to a tire radius of each wheel, a physical quantity relating to a road surface friction coefficient, and a physical quantity relating to a spring constant of a combination spring which combines spring elements, using a known value of a distribution ratio of a braking force and a driving force to each wheel and a known value of a distribution ratio of a load on each wheel, based on a wheel speed difference between any two wheels and the acceleration and deceleration rate of the vehicle during acceleration and deceleration of the vehicle. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
8. A tire state determining apparatus, comprising:
-
an estimating portion that estimates at least one of a physical quantity relating to a tire radius of each wheel, a physical quantity relating to a road surface friction coefficient, and a physical quantity relating to a spring constant of a combination spring which combines spring elements, using a known value of a distribution ratio of a braking force and a driving force to each wheel and a known distribution ratio of a load on each wheel, based on a wheel speed difference between any two wheels and the acceleration and deceleration rate of a vehicle during acceleration and deceleration of the vehicle; and
a determining portion that determines at least one of a tire type, a tire air pressure, and a tire wear state, based on at least one of the physical quantities estimated by the estimating portion. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
-
-
23. A physical quantity estimating method, comprising the step of:
estimating at least one of a physical quantity relating to a tire radius of each wheel, a physical quantity relating to a road surface friction coefficient, and a physical quantity relating to a spring constant of a combination spring which combines spring elements, using a known value of a distribution ratio of a braking force and a driving force to each wheel and a known distribution ratio of a load on each wheel, based on a wheel speed difference between any two wheels and the acceleration and deceleration rate of a vehicle during acceleration and deceleration of the vehicle. - View Dependent Claims (24, 25, 26, 27)
-
28. A tire state determination method, comprising the steps of:
-
estimating at least one of a physical quantity relating to a tire radius of each wheel, a physical quantity relating to a road surface friction coefficient, and a physical quantity relating to a spring constant of a combination spring which combines spring elements, using a known value of a distribution ratio of a braking force and a driving force to each wheel and a known distribution ratio of a load on each wheel, based on a wheel speed difference between any two wheels and the acceleration and deceleration rate of a vehicle during acceleration and deceleration of the vehicle; and
determining at least one of a tire type, a tire air pressure, and a tire wear state, based on at least one of the physical quantities estimated by the estimating portion. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
-
Specification