Electrically operated braking system having a device for operating electric motor of brake to obtain relationship between motor power and braking torque
First Claim
1. An electrically operated braking system of a motor vehicle having a wheel, comprising:
- a rotor rotating with said wheel;
a brake operating member which is operated by an operator of the motor vehicle;
an electric power source;
a brake including a friction member movable to be forced onto said rotor, and an electric motor which is operated by an electric power supplied from the electric power source, to generate a drive force for forcing said friction member onto said rotor and thereby braking said wheel;
a controller which determines an amount of the electric power to be supplied from said electric power source to said electric motor, depending upon an operating amount of said brake operating member, for thereby controlling an operation of said brake; and
a relationship estimating and utilizing device provided for obtaining an actual value of the electric power supplied from said electric power source to said electric motor during an operation of said brake while the motor vehicle is running, and an actual value of a braking torque applied from said brake to said wheel during said operation of said brake, for estimating a relationship between said electric power to be supplied to said electric motor and said braking torque to be applied to said wheel, on the basis of said actual values obtained, and for utilizing said relationship for controlling said braking torque, said relationship changing with a change in a friction coefficient of said friction member, and being formulated such that said braking torque to be supplied to said wheel is changed with a change in said electric power to be supplied to said electric motor.
1 Assignment
0 Petitions
Accused Products
Abstract
An electrically operated braking system of a motor vehicle, including a brake having a friction member movable to be forced onto a rotor rotating with a vehicle wheel and thereby braking the wheel. The friction member is forced onto the rotor by an electric motor operated by an electric power supplied from an electric power source. A controller determines an amount of the electric power to be supplied to the motor, depending upon an operating amount of the brake operating member, and a relationship estimated by a relationship estimating and utilizing device. The relationship estimating and utilizing device obtains an actual value of the electric power supplied to the motor during operation of the brake while the vehicle is running, and an actual value of a braking torque applied from the brake to the wheel during the brake operation, and estimate a relationship between the electric power to be supplied to the wheel on the basis of the actual values obtained. The estimated relationship is then utilized to control the braking torque to be generated in response to operation of the brake operating member.
80 Citations
14 Claims
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1. An electrically operated braking system of a motor vehicle having a wheel, comprising:
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a rotor rotating with said wheel;
a brake operating member which is operated by an operator of the motor vehicle;
an electric power source;
a brake including a friction member movable to be forced onto said rotor, and an electric motor which is operated by an electric power supplied from the electric power source, to generate a drive force for forcing said friction member onto said rotor and thereby braking said wheel;
a controller which determines an amount of the electric power to be supplied from said electric power source to said electric motor, depending upon an operating amount of said brake operating member, for thereby controlling an operation of said brake; and
a relationship estimating and utilizing device provided for obtaining an actual value of the electric power supplied from said electric power source to said electric motor during an operation of said brake while the motor vehicle is running, and an actual value of a braking torque applied from said brake to said wheel during said operation of said brake, for estimating a relationship between said electric power to be supplied to said electric motor and said braking torque to be applied to said wheel, on the basis of said actual values obtained, and for utilizing said relationship for controlling said braking torque, said relationship changing with a change in a friction coefficient of said friction member, and being formulated such that said braking torque to be supplied to said wheel is changed with a change in said electric power to be supplied to said electric motor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
relationship estimating means for estimating said relationship between said electric power and said braking torque, and relationship utilizing means for utilizing said relationship estimated by said relationship estimating means, to effect at least one of;
a) a step of determining the amount of the electric power to be supplied to said electric motor, on the basis of said operating amount of said brake operating member, and according to said relationship estimated by said relationship estimating means, and b) a step of providing an operator of the motor vehicle with information relating to said relationship estimated by said relationship estimating means.
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14. An electrically operated braking system of a motor vehicle having a wheel, comprising:
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a rotor rotating with said wheel;
a brake operating member which is operated by an operator of the motor vehicle;
an electric power source;
a brake including a friction member movable to be forced onto said rotor, and an electric motor which is operated by an electric power supplied from the electric power source, to generate a drive force for forcing said friction member onto said rotor and thereby braking said wheel;
a controller which determines an amount of the electric power to be supplied from said electric power source to said electric motor, depending upon an operating amount of said brake operating member, for thereby controlling an operation of said brake; and
a relationship estimating and utilizing device provided for obtaining an actual value of a physical quantity relating to the electric power supplied from said electric power source to said electric motor during an operation of said brake while the motor vehicle is running, and an actual value of a physical quantity relating to a braking torque applied from said brake to said wheel during said operation of said brake, for estimating a relationship between said electric power to be supplied to said electric motor and said braking torque to be applied to said wheel, on the basis of said actual values obtained, and for utilizing said relationship for controlling said braking torque, said relationship changing with a change in a friction coefficient of said friction member, and being formulated such that said braking torque to be supplied to said wheel being changed with a change in said electric power to be supplied to said electric motor.
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Specification