PARKING BRAKE SYSTEM OF EMB USING HYDRAULIC DEVICE AND PARKING BRAKE CONTROL METHOD FOR EMB
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IPC분류정보
국가/구분
United States(US) Patent
공개
국제특허분류(IPC7판)
B60T-013/58
B60T-013/68
B60T-015/36
출원번호
US-0273097
(2014-05-08)
공개번호
US-0075922
(2015-03-19)
우선권정보
KR-10-2013-0110948 (2013-09-16)
발명자
/ 주소
KIM, Jong Sung
출원인 / 주소
Hyundai Mobis Co., Ltd.
인용정보
피인용 횟수 :
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0
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 system of an EMB, comprising: 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 pressur
1. A parking brake system of an EMB, comprising: 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; andsecond solenoid valves which are provided in the second hydraulic lines so as to change a communication state of the second hydraulic lines. 2. The parking brake system of claim 1, wherein the pedal unit has a pedal sensor to supply an electrical signal to an ECU in accordance with a state in which a brake pedal is manipulated. 3. The parking brake system of claim 2, wherein the ECU receives a signal of the pedal sensor, and sends information to each wheel ECU so as to control braking force, and controls the first and second solenoid valves. 4. The parking brake system of claim 1, wherein the first solenoid valve is a normally open type that the first solenoid valve has a state in which the first solenoid valve allows the first hydraulic line to be communicated when a control current is not provided. 5. The parking brake system of claim 4, wherein the first solenoid valve and the second solenoid valve are a normally closed type that the first solenoid valve maintains a state in which the first solenoid valve shuts off the first hydraulic line when a parking brake signal is turned on, and the second solenoid valve has a state in which the second solenoid valve allows the second hydraulic line to be communicated. 6. The parking brake system of claim 5, wherein the EMB includes: a caliper body;an EMB actuator which is mounted on the caliper body, and generates braking force for a brake disc by boosting rotational force of a drive motor using a gear; anda hydraulic piston device which includes a master piston which is fixed to the caliper body, and installed so as to be rectilinearly slidable with respect to the EMB actuator by the EMB actuator, a slave piston which has a hydraulic pressure chamber and rectilinearly slides by an action of hydraulic pressure that presses the master piston, and a seal which is provided between the master piston and the EMB actuator. 7. The parking brake system of claim 6, wherein the caliper body performs braking using clamping force that presses a wheel disc. 8. The parking brake system of claim 7, wherein when the hydraulic piston device is moved forward by the EMB actuator or an action of hydraulic pressure, the hydraulic piston device presses the brake disc, which is positioned at the inside from the wheel disc, against the wheel disc such that the caliper body is moved due to reaction force generated by piston force, and the movement of the caliper body presses the brake disc, which is positioned at the outside from the wheel disc, against the wheel disc such that clamping force is generated by both the brake discs. 9. The parking brake system of claim 8, wherein piston pressing force, which is generated by the EMB actuator, presses the master piston, and the slave piston is moved forward by action of hydraulic pressure that presses the master piston. 10. The parking brake system of claim 6, wherein the seal is mounted in a seal groove that is relatively formed in any one of the master piston and the EMB actuator. 11. The parking brake system of claim 6, wherein the master piston is a spindle nut. 12. The parking brake system of claim 6, wherein the first hydraulic lines are formed to be divided to supply hydraulic pressure from the master cylinder to the hydraulic piston devices that are provided in the EMBs, respectively, and the first solenoid valves are provided in the divided first hydraulic lines, respectively. 13. The parking brake system of claim 12, wherein the second hydraulic lines are formed to be extended between the first solenoid valves and the EMBs, respectively, and the second solenoid valves are provided in the second hydraulic lines, respectively. 14. A parking brake control method for an EMB in the parking brake system of the EMB according to claim 6, the method comprising: a first step of generating braking force through a drive motor, which has an amount of force F+d that is produced by adding a predetermined amount of force d to an amount of clamping force F that is required when a parking brake signal is turned on;a second step of controlling the amount of force F+d to be reduced to the amount of force F when the second solenoid valve allows the second hydraulic line to be communicated;a third step of allowing the braking force to have the amount of force F+d by pressing the master piston using the drive motor;a fourth step of repeatedly performing the second and third steps until the master piston comes into contact with the slave piston; anda fifth step of constraining rotational force of the drive motor of the EMB actuator when the master piston comes into contact with the slave piston. 15. The method of claim 14, wherein in the fourth step, the contact between the master piston and the slave piston is determined while assuming that this contact occurs when current consumption exceeds a reference value.
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