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;
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, said relationship being formulated such that said braking torque to be applied to said wheel being changed with a change in said electric power to be supplied to said electric motor.
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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 an electric motor operated by an electric power supplied from an electric power source to generate a drive force for forcing the friction member onto the rotor and thereby braking the wheel, a controller which 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 estimating and utilizing device for obtaining an actual value of the electric power supplied to the motor during an 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, for estimating a relationship between the electric power to be supplied to the motor and the braking torque to be applied to the wheel, on the basis of the actual values obtained, and for utilizing the estimated relationship.
48 Citations
21 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;
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, said relationship being formulated such that said braking torque to be applied to said wheel being 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, 14, 15)
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16. 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;
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, said relationship being formulated such that said braking torque to be applied to said wheel being changed with a change in said electric power to be supplied to said electric motor.
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17. A braking system for a motor vehicle having a wheel, comprising:
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a rotor rotating with said wheel;
a friction member movable to be forced onto said rotor, for braking said wheel;
a support member for supporting said friction member in frictional contact with said rotor so as to prevent said friction member from being rotated with said rotor;
a pressing device for forcing said friction member into frictional contact with said rotor; and
a force switch which is interposed between said friction member and said support member, so as to receive a force from said friction member in frictional contact with said rotor, said force switch being selectively placed in one of two states, depending upon whether said force received from said friction member is larger than a predetermined threshold which is not zero. - View Dependent Claims (18, 19, 20, 21)
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Specification