ELECTRIC PARKING BRAKE SYSTEM AND METHOD FOR CONTROLLING THE ELECTRIC PARKING BRAKE SYSTEM
First Claim
1. An electric parking brake system, comprising:
- a brake that includes a rotating body which has a friction face and which rotates together with a wheel, a friction member which is fitted to a non-rotating body so as to be movable relative to the non-rotating body, and a pushing mechanism that pushes the friction member against the friction face of the rotating body;
an electric motor;
a motion conversion mechanism that converts a rotation of a rotating shaft of the electric motor into a linear motion of an output member of the motion conversion mechanism;
a connection unit that is connected at one end to the output member of the motion conversion mechanism, and that is connected at the other end to the pushing mechanism;
a maintaining mechanism that maintains a friction member pushing force that is a force with which the friction member is pushed against the friction face in the brake, when electric current is not supplied to the electric motor;
an inclination angle sensor that is provided in a vehicle, and that detects an inclination angle of the vehicle in a longitudinal direction of the vehicle; and
a pushing force control unit that controls the electric motor to control the friction member pushing force in the brake to a value set based on a detection value from the inclination angle sensor,wherein the pushing force control unit includes a temperature determination unit that determines a temperature of the inclination angle sensor, and a temperature-based target value setting unit that sets a target value of the friction member pushing force based on the temperature of the inclination angle sensor determined by the temperature determination unit, temperature characteristics of the inclination angle sensor, and the detection value from the inclination angle sensor.
1 Assignment
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Accused Products
Abstract
An electric parking brake system is provided with a brake that includes a rotating body which has a friction face and which rotates together with a wheel, a friction member which is fitted to a non-rotating body so as to be movable relative to the non-rotating body, and a pushing mechanism that pushes the friction member against the friction face or the rotating body. In the brake, the friction member pushing force that is the force with which the friction member is pushed against the friction face is controlled based on the temperature of an inclination angle sensor that detects the inclination angle of the vehicle in the longitudinal direction of the vehicle, the temperature characteristics of the inclination angle sensor, and the detection value from the inclination angle sensor.
10 Citations
20 Claims
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1. An electric parking brake system, comprising:
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a brake that includes a rotating body which has a friction face and which rotates together with a wheel, a friction member which is fitted to a non-rotating body so as to be movable relative to the non-rotating body, and a pushing mechanism that pushes the friction member against the friction face of the rotating body; an electric motor; a motion conversion mechanism that converts a rotation of a rotating shaft of the electric motor into a linear motion of an output member of the motion conversion mechanism; a connection unit that is connected at one end to the output member of the motion conversion mechanism, and that is connected at the other end to the pushing mechanism; a maintaining mechanism that maintains a friction member pushing force that is a force with which the friction member is pushed against the friction face in the brake, when electric current is not supplied to the electric motor; an inclination angle sensor that is provided in a vehicle, and that detects an inclination angle of the vehicle in a longitudinal direction of the vehicle; and a pushing force control unit that controls the electric motor to control the friction member pushing force in the brake to a value set based on a detection value from the inclination angle sensor, wherein the pushing force control unit includes a temperature determination unit that determines a temperature of the inclination angle sensor, and a temperature-based target value setting unit that sets a target value of the friction member pushing force based on the temperature of the inclination angle sensor determined by the temperature determination unit, temperature characteristics of the inclination angle sensor, and the detection value from the inclination angle sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An electric parking brake system, comprising:
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a brake that includes a rotating body which has a friction face and which rotates together with a wheel, a friction member which is fitted to a non-rotating body so as to be movable relative to the non-rotating body, and a pushing mechanism that pushes the friction member against the friction face of the rotating body; an electric motor; a motion conversion mechanism that converts a rotation of a rotating shaft of the electric motor into a linear motion of an output member of the motion conversion mechanism; a connection unit that is connected at one end to the output member of the motion conversion mechanism, and that is connected at the other end to the pushing mechanism; a maintaining mechanism that maintains a friction member pushing force that is a force with which the friction member is pushed against the friction face in the brake, when electric current is not supplied to the electric motor; and a pushing force control unit that controls the electric motor to control the friction member pushing force in the brake with an output value from a sensor provided in a vehicle taken into account, wherein the pushing force control unit includes a temperature determination unit that determines a temperature of the sensor, and a temperature-based pushing force control unit that controls the friction member pushing force based on the temperature of the sensor determined by the temperature determination unit, the temperature characteristics of the sensor, and the output value from the sensor.
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11. A method for controlling an electric parking brake system, comprising:
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determining a temperature of a sensor provided in a vehicle; and controlling, in a brake that includes;
a rotating body which has a friction face and which rotates together with a wheel;
a friction member which is fitted to a non-rotating body so as to be movable relative to the non-rotating body; and
a pushing mechanism that pushes the friction member against the friction face of the rotating body, a friction member pushing force that is a force with which the friction member is pushed against the friction face in the brake, based on the determined temperature of the sensor, temperature characteristics of the sensor, and a detection value from the sensor. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification