Parking brake system of EMB using hydraulic device and parking brake control method for EMB
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B60T-013/00
B60T-013/68
B60T-013/58
B60T-013/66
B60T-013/74
출원번호
US-0273097
(2014-05-08)
등록번호
US-9834190
(2017-12-05)
우선권정보
KR-10-2013-0110948 (2013-09-16)
발명자
/ 주소
Kim, Jong Sung
출원인 / 주소
Hyundai Mobis Co., Ltd.
대리인 / 주소
NSIP Law
인용정보
피인용 횟수 :
0인용 특허 :
5
초록▼
Disclosed are a parking brake system of an EMB used in combination with a hydraulic device, and a parking brake control method for an EMB. The parking brake system of an EMB according to an exemplary embodiment of the present invention includes: a pedal unit which has a configuration in which a peda
Disclosed are a parking brake system of an EMB used in combination with a hydraulic device, and a parking brake control method for an EMB. The parking brake system of an EMB according to an exemplary embodiment of the present invention includes: a pedal unit which has a configuration in which a pedal simulator and a master cylinder are coupled; electromechanical brakes (EMBs) each of which has a hydraulic piston device; first hydraulic lines which are connected so as to supply hydraulic pressure from the master cylinder to the hydraulic piston devices of the EMBs; first solenoid valves which are provided to change a communication state of the first hydraulic lines; second hydraulic lines which are extended between the first solenoid valves and the EMBs, and connected to a reservoir; and second solenoid valves which are provided to change a communication state of the second hydraulic lines.
대표청구항▼
1. A parking brake apparatus, comprising: a pedal coupled to a pedal simulator and a master cylinder, the pedal comprising a sensor configured to supply an electrical signal to an electronic control unit (ECU) based on a depression of the pedal;a first electromechanical brake (EMB) comprising a firs
1. A parking brake apparatus, comprising: a pedal coupled to a pedal simulator and a master cylinder, the pedal comprising a sensor configured to supply an electrical signal to an electronic control unit (ECU) based on a depression of the pedal;a first electromechanical brake (EMB) comprising a first hydraulic piston;a second EMB comprising a second hydraulic piston;a first hydraulic line configured to supply hydraulic pressure from the master cylinder to the first hydraulic piston;a second hydraulic line configured to supply hydraulic pressure from the master cylinder to the second hydraulic piston;a first solenoid valve configured to change a communication state of the first hydraulic line;a second solenoid valve configured to change a communication state of the second hydraulic line;a third hydraulic line extending from the first line to a reservoir;a fourth hydraulic line extending from the second line to the reservoir;a third solenoid valve configured to change a communication state of the third hydraulic line;a fourth solenoid valve configured to change a communication state of the fourth hydraulic line;a drive motor configured to drive at least one of the first hydraulic piston or the second hydraulic piston,wherein the electronic control unit (ECU) is configured to: generate a first amount of braking force by controlling the drive motor;generate a second amount of braking force by controlling the third solenoid valve and the fourth solenoid valve to allow communication of the third and fourth hydraulic lines, the second amount of braking force being less than the first amount of braking force;repeat the generating of the first amount of braking force and the generating of the second amount of braking force; andstop the repeating of the generating of the first amount of braking force and the generating of the second amount of braking force, in response to a current consumption of the drive motor exceeding a threshold. 2. The parking brake apparatus of claim 1, wherein the ECU is further configured to receive a signal from the sensor, and to control the first, second, third, and fourth solenoid valves based on the signal. 3. The parking brake apparatus of claim 1, wherein the first and second solenoid valves are configured to be open, in response to a control current not being provided to the first and second solenoid valves. 4. The parking brake apparatus of claim 3, wherein the first and second solenoid valves are configured to be closed, in response to a parking brake signal being turned on, and the third and fourth solenoid valves are configured to be open, in response to the parking brake signal being turned on. 5. The parking brake apparatus of claim 4, wherein the EMB comprises: a caliper body;an EMB actuator mounted on the caliper body and configured to generate braking force for a brake disc by boosting rotational force of the drive motor using a gear; anda hydraulic piston comprising: a master piston fixed to the caliper body and rectilinearly slidable with respect to the EMB actuator by the EMB actuator;a slave piston comprising a hydraulic pressure chamber and rectilinearly slidable by an action of hydraulic pressure that presses the master piston; anda seal disposed between the master piston and the EMB actuator. 6. The parking brake apparatus of claim 5, wherein the caliper body is configured to brake by using a clamping force pressing on a wheel disc. 7. The parking brake apparatus of claim 6, wherein: the hydraulic piston is configured to press the brake disc, in response to the hydraulic piston moving forward by the EMB actuator, or by an action of hydraulic pressure,the hydraulic piston is positioned at the inside from the wheel disc and against the wheel disc such that the caliper body is configured to move due to a reaction force generated by a piston force,the caliper body is configured to press against the brake disc, andthe brake disk is positioned outside of the wheel disc and against the wheel disc such that clamping force is generated by the brake disc. 8. The parking brake apparatus of claim 7, wherein the slave piston is configured to be moved forward by action of hydraulic pressure that presses the master piston. 9. The parking brake apparatus of claim 5, wherein the seal is mounted in a seal groove formed in any one of the master piston or the EMB actuator. 10. The parking brake apparatus of claim 5, wherein the master piston is a spindle nut. 11. The parking brake apparatus of claim 5, wherein the first and second hydraulic lines are configured to supply hydraulic pressure from the master cylinder to the hydraulic piston. 12. The parking brake apparatus of claim 11, wherein the third hydraulic line extends from a portion of the first line between the first solenoid valve and the first EMB, and the fourth hydraulic line extends from a portion of the second line between the second solenoid valve and the second EMB. 13. The parking brake system of claim 5, wherein the ECU is further configured to: control the drive motor to constrain rotational force of the drive motor, in response to the stopping of the repeating of the generating of the first amount of braking force and generating of the second amount of braking force,wherein master piston is in contact with the slave piston during the constraining of the rotational force of the drive motor. 14. The park brake system of claim 13, wherein the contact between the master piston and the slave piston is determined by the ECU using an assumption that the contact occurs in response to the current consumption exceeding the reference value. 15. The parking brake system of claim 13, wherein the first braking force is equal to an amount of initial force plus an amount of clamping force that is required when a parking brake signal is turned on. 16. The parking brake system of claim 14, wherein the second braking force is equal to the amount of clamping force that is required when the parking brake signal is turned on. 17. A parking brake apparatus, comprising: a pedal coupled to a pedal simulator and a master cylinder, the pedal comprising a sensor configured to supply an electrical signal to an electronic control unit (ECU) based on a depression of the pedal;a first electromechanical brake (EMB) comprising a first hydraulic piston;a second EMB comprising a second hydraulic piston;a first hydraulic line configured to supply hydraulic pressure from the master cylinder to the first hydraulic piston;a second hydraulic line configured to supply hydraulic pressure from the master cylinder to the second hydraulic piston;a first solenoid valve configured to change a communication state of the first hydraulic line;a second solenoid valve configured to change a communication state of the second hydraulic line;a third hydraulic line extending from the first line to a reservoir;a fourth hydraulic line extending from the second line to the reservoir;a third solenoid valve configured to change a communication state of the third hydraulic line;a fourth solenoid valve configured to change a communication state of the fourth hydraulic line;a drive motor configured to drive either one or both of the first hydraulic piston and the second hydraulic piston,wherein the electronic control unit (ECU) is configured to: generate a first amount of braking force by controlling the drive motor;generate a second amount of braking force by controlling the third solenoid valve and the fourth solenoid valve to allow communication of the third and fourth hydraulic lines, the second amount of braking force being less than the first amount of braking force;repeat the generating of the first amount of braking force and the generating of the second amount of braking force;determine that the master piston contacts the slave piston, in response to sensing that a current consumption exceeds a reference value; andconstrain rotation of the drive motor, in response to the determination that the master piston contacts the slave piston.
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이 특허에 인용된 특허 (5)
Beer, Wilhelm, Electrohydraulic control system for the actuation of an actuator in a motor vehicle.
Schneider, Heinz-Anton; Balz, Jürgen, Motor vehicle braking system having a hydraulically actuated service braking system and an electromechanically actuated braking system.
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