KR100774116B1 - Apparatus of controlling brake' oil pressure in vehicle - Google Patents

Apparatus of controlling brake' oil pressure in vehicle Download PDF

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KR100774116B1
KR100774116B1 KR1020020007308A KR20020007308A KR100774116B1 KR 100774116 B1 KR100774116 B1 KR 100774116B1 KR 1020020007308 A KR1020020007308 A KR 1020020007308A KR 20020007308 A KR20020007308 A KR 20020007308A KR 100774116 B1 KR100774116 B1 KR 100774116B1
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brake
control
hydraulic pressure
pressure
wheel cylinder
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KR1020020007308A
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Korean (ko)
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KR20030067833A (en
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조효신
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주식회사 만도
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/12—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid
    • B60T13/14—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid using accumulators or reservoirs fed by pumps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/17—Using electrical or electronic regulation means to control braking
    • B60T8/175—Brake regulation specially adapted to prevent excessive wheel spin during vehicle acceleration, e.g. for traction control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T2270/00—Further aspects of brake control systems not otherwise provided for
    • B60T2270/30—ESP control system

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Regulating Braking Force (AREA)

Abstract

본 발명은 브레이크 액압 제어장치에 관한 것으로, 본 발명의 목적은 액압펌프와 휠 실린더의 유로상에 보조 어큐뮬레이터를 구비하여 트랙션 제어 또는 차량 자세제어시 휠 실린더에서의 초기 압력상승율을 향상시키는 브레이크 액압 제어장치를 제공하는 데 있다.The present invention relates to a brake hydraulic pressure control device, an object of the present invention is to provide an auxiliary accumulator on the flow path of the hydraulic pump and the wheel cylinder to control the hydraulic pressure of the brake to improve the initial pressure rise rate in the wheel cylinder during traction control or vehicle attitude control To provide a device.

본 발명은 차량 자세제어용 브레이크 액압 제어장치에 있어서, 액압펌프와 휠 실린더사이의 유로에 분기된 유로에 마련되어 노멀클로즈형 유출밸브를 중개하여 소정의 브레이크 액량을 축압하는 보조어큐뮬레이터를 포함하며, 브레이크 트랙션 제어 또는 차량 자세제어의 개시시 전자제어장치는 액압펌프를 구동시킴과 함께 노멀클로즈형 유출밸브를 열어 중압 어큐뮬레이터와 보조어큐뮬레이터에 축압된 브레이크 액압이 휠 실린더에 공급되어 브레이크 트랙션 제어 또는 차량 자세 제어를 수행하게 하는 것을 특징으로 한다.The present invention relates to a brake hydraulic pressure control device for vehicle attitude control, comprising: an auxiliary accumulator provided in a flow path branched between a hydraulic pump and a wheel cylinder to mediate a normal closed flow valve to accumulate a predetermined amount of brake fluid, and brake traction At the start of control or vehicle attitude control, the electronic control unit drives the hydraulic pump and opens the normal-closed outlet valve to supply the brake hydraulic pressure accumulated in the medium pressure accumulator and the auxiliary accumulator to the wheel cylinder to perform brake traction control or vehicle attitude control. It is characterized in that to perform.

Description

브레이크 액압 제어장치{Apparatus of controlling brake' oil pressure in vehicle}Brake hydraulic pressure control device {Apparatus of controlling brake 'oil pressure in vehicle}

도 1은 종래의 브레이크 액압 제어장치에 대한 유압회로도이다.1 is a hydraulic circuit diagram of a conventional brake hydraulic pressure control device.

도 2는 본 발명에 따른 브레이크 액압 제어장치에 대한 유압회로도이다.
2 is a hydraulic circuit diagram of a brake hydraulic pressure control apparatus according to the present invention.

*도면의 주요 기능에 대한 부호의 설명** Description of the symbols for the main functions of the drawings *

53: 마스터실린더 58a,58b: 액압펌프53: master cylinder 58a, 58b: hydraulic pump

55a,55b,55c,55d: 노멀오픈형 솔레노이드 유입밸브55a, 55b, 55c, 55d: Normally open solenoid inlet valve

56a,56b,56c,56d: 노멀클로즈형 솔레노이드 유출밸브 56a, 56b, 56c, 56d: Normally closed solenoid outlet valve

62a,62b: 노멀오픈형 제 1 솔레노이드밸브 62a, 62b: normally open first solenoid valve

63a,63b: 제 1 릴리프밸브 63a, 63b: first relief valve

64a,64b: 노멀오픈형 일렉트릭 셔틀밸브 64a, 64b: Normally open electric shuttle valve

65a,65b: 제 2 릴리프밸브 66a,66b: 중압 어큐뮬레이터65a, 65b: second relief valve 66a, 66b: medium pressure accumulator

67a,67b: 노멀클로즈형 제 2 솔레노이드밸브67a, 67b: Normally closed second solenoid valve

70a,70b,70c,70d: 휠실린더70a, 70b, 70c, 70d: wheel cylinder

76a,76b: 보조유로 77a,77b: 노멀클로즈형 보조유출밸브76a, 76b: Auxiliary flow path 77a, 77b: Normally closed auxiliary outlet valve

78a,78b: 보조어큐뮬레이터78a, 78b: auxiliary accumulator

본 발명은 브레이크 액압 제어장치에 관한 것으로, 차량 자세 제어시 차륜에 마련된 휠 실린더에서의 초기 압력의 증가율을 향상시키기 위해 보조 어큐뮬레이터를 구비한 브레이크 액압 제어장치에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake hydraulic pressure control device, and to a brake hydraulic pressure control device including an auxiliary accumulator for improving an increase rate of initial pressure in a wheel cylinder provided in a wheel during vehicle attitude control.

일반적으로, 전자제어방식을 적용하고 있는 차량에서는 운전자의 조작에만 의존하지 않고 자차의 차량상태와 도로의 노면상태등을 감지하여 각 차륜의 유압브레이크에 가해지는 제동유압을 제어하고 있으며, 이를 전자적으로 제어하는 방식으로 이른바 ESP(Electronic Stability Program)제어가 제안되었다. In general, a vehicle using an electronic control method controls braking hydraulic pressure applied to a hydraulic brake of each wheel by sensing a vehicle state of a vehicle and a road surface state of a vehicle without depending on the driver's operation. As a control method, so-called electronic stability program (ESP) control has been proposed.

이러한 ESP 제어는 휠 센서, 요레이트 센서, 횡가속도센서, 압력센서, 스티리어링센서 등과 같은 차량의 센서를 통해 차체속도등의 차량상태와 노면상태를 감지하고, 그 감지결과에 따라 각 차륜에 장착된 유압브레이크를 가압 또는 감압하여 차량의 자세제어를 수행하게 된다.The ESP control detects vehicle and road conditions such as body speed through the sensors of the vehicle such as wheel sensor, yaw rate sensor, lateral acceleration sensor, pressure sensor and steering ring sensor. By pressing or reducing the mounted hydraulic brake to perform the attitude control of the vehicle.

도 1은 종래의 브레이크 액압 제어장치의 유압회로도이다. 도 1에 도시된바와 같이, 차량의 급발진시나 급가속시 과도한 엔진 토오크나 노면조건 등에 의해 차륜(FR,RL,RR,FL)과 노면사이에 슬립이 발생하는 경우가 발생하는데, 이 때 노면조건에 상응하는 구동 토오크가 유지되도록 브레이크페달(51)을 밟지 않고도 차륜(FR,RL,RR,FL)에 적정한 브레이크압을 전달함으로써 차량주행을 제어하는 브레이크 트랙션 제어시스템이 작동된다. 1 is a hydraulic circuit diagram of a conventional brake hydraulic pressure control device. As shown in FIG. 1, when the vehicle is suddenly started or accelerated, slip occurs between the wheels FR, RL, RR, and FL due to excessive engine torque or road surface conditions. The brake traction control system for controlling the driving of the vehicle is operated by transmitting the appropriate brake pressure to the wheels FR, RL, RR, and FL without stepping on the brake pedal 51 so that the corresponding driving torque is maintained.                         

전자제어장치가 구동륜(RL,RR)의 소정이상의 슬립을 검출하면 트랙션 제어를 개시한다. 이에 따라, 전자제어장치는 노멀오픈형 제 1솔레노이드밸브(62a,62b)와 셔틀밸브(64a,64b)를 폐쇄시켜 마스터실린더(53)와 휠실린더(70a,70b,70c,70d)와의 연통을 차단하고, 중압 어큐뮬레이터(66a,66b)와 연결된 노멀클로즈형 제 2솔레노이드밸브(67a,67b)를 개방시켜 중압 어큐뮬레이터(66a,66b)와 액압펌프(58a,58b)의 흡입포트를 연통시킨다. 이와 동시에, 액압펌프(58a,58b)를 구동시켜 중압 어큐뮬레이터(66a,66b)에 축압되어 있는 브레이크액이 고압어큐뮬레이터(60a,60b) 및 오리피스(61a,61b)를 지나면서 선형적으로 변환된 후 구동륜(RL,RR)측의 노멀오픈형 솔레노이드 유입밸브(55b,55c)를 거쳐 구동륜(RL,RR)의 휠실린더(70b,70c)로 공급되어 브레이크액압을 증가시킴으로써 구동륜(RL,RR)의 슬립을 감쇠시킨다.The traction control is started when the electronic controller detects a slip of the predetermined driving wheels RL and RR. Accordingly, the electronic controller closes the normal open type first solenoid valves 62a and 62b and the shuttle valves 64a and 64b to block communication between the master cylinder 53 and the wheel cylinders 70a, 70b, 70c and 70d. Then, the normal closed second solenoid valves 67a and 67b connected to the medium pressure accumulators 66a and 66b are opened to communicate the suction ports of the medium pressure accumulators 66a and 66b and the hydraulic pumps 58a and 58b. At the same time, the brake fluid accumulated in the medium pressure accumulators 66a and 66b by driving the hydraulic pumps 58a and 58b is linearly converted while passing through the high pressure accumulators 60a and 60b and the orifices 61a and 61b. Slip of the driving wheels RL and RR is increased by supplying to the wheel cylinders 70b and 70c of the driving wheels RL and RR through the normal-open solenoid inlet valves 55b and 55c on the driving wheels RL and RR. Attenuate

한편, 전자제어장치는 액압펌프(58a,58b)의 구동과 동시에, 피구동륜(FR,FL)측의 노멀오픈형 솔레노이드 유입밸브(55a,55d)를 폐쇄시켜 피구동륜(FR,FL)의 휠실린더(70a,70d)는 가압되지 않도록 한다. 이와 같이, 트랙션 제어 또는 차량 자세제어에서의 가압모드시 액압펌프(58a,58b)가 중압 어큐뮬레이터(66a,66b)로부터 소정액압의 브레이크액을 흡인하기 때문에 펌프효율이 좋아질 뿐만 아니라, 브레이크액압의 압력상승속도를 빠르게 하여 구동륜(RL,RR)의 휠실린더(70b,70c)에 원하는 브레이크액압을 더욱 신속하게 공급할 수 있게 된다.On the other hand, the electronic controller drives the hydraulic pumps 58a and 58b and simultaneously closes the normally open solenoid inlet valves 55a and 55d on the driven wheels FR and FL, thereby closing the wheel cylinders of the driven wheels FR and FL. Do not pressurize 70a, 70d. In this manner, the hydraulic pumps 58a and 58b suck the brake fluid of a predetermined hydraulic pressure from the medium pressure accumulators 66a and 66b in the pressurization mode in the traction control or the vehicle attitude control, so that not only the pump efficiency is improved but also the pressure of the brake hydraulic pressure. It is possible to supply the desired brake fluid pressure more quickly to the wheel cylinders 70b and 70c of the drive wheels RL and RR by increasing the ascending speed.

그러나, 중압 어큐뮬레이터(66a,66b)의 구조상 액압펌프(58a,58b)에서 휠실린더(70a,70b,70c,70d)까지의 유로상의 길이가 길어 초기 압력증가시 소정의 타임 딜레이(Time Delay)가 발생한다. 이러한 타임 딜레이에 의해 초기 압력증가가 주춤 거리는 현상이 발생한다. 이로 인해, 차량에 요잉모멘트가 과다 발생시 ESP 시스템이 빠른 대응을 하지 못해 운전자에게 불안감을 느끼게 하는 문제점이 있었다.However, due to the structure of the medium pressure accumulators 66a and 66b, the length of the flow path from the hydraulic pumps 58a and 58b to the wheel cylinders 70a, 70b, 70c and 70d is long, so that a predetermined time delay is increased when the initial pressure increases. Occurs. This delay causes the initial pressure increase to slow down. For this reason, when the yawing moment is excessive in the vehicle, the ESP system does not respond quickly, causing a driver to feel anxiety.

본 발명은 전술한 문제점을 해결하기 위한 것으로, 본 발명의 목적은 액압펌프와 휠 실린더의 유로상에 보조 어큐뮬레이터를 마련하여 트랙션 제어 또는 차량 자세제어시 휠 실린더에서의 초기 압력상승율을 향상시키는 데 있다.The present invention is to solve the above problems, an object of the present invention is to provide an auxiliary accumulator on the flow path of the hydraulic pump and the wheel cylinder to improve the initial pressure rise rate in the wheel cylinder during traction control or vehicle attitude control .

전술한 목적을 달성하기 위한 본 발명은 마스터실린더와, 각 차륜에 마련되어 브레이크 액압에 의해 제동력을 발휘하는 휠 실린더와, 상기 각 휠 실린더의 입구측과 출구측에 각각 마련되어 브레이크 액압의 흐름을 제어하는 노멀오픈형 솔레노이드 유입밸브 및 노멀클로즈형 솔레노이드 유출밸브와, 브레이크액을 흡입하여 상기 휠 실린더로 토출하는 액압펌프와, 상기 액압펌프의 토출포트로부터의 토출압을 상기 액압펌프의 흡입포트측으로 바이패스시키는 바이패스유로에 마련되어 소정의 브레이크 액압이 축압되는 중압 어큐뮬레이터, 상기 각 휠 실린더에 전달되는 브레이크 액압을 제어하는 전자제어장치를 구비하는 브레이크 액압 제어장치에 있어서, 상기 액압펌프와 휠 실린더사이의 유로에 분기된 유로에 마련되어 노멀클로즈형 유출밸브를 중개하여 소정의 브레이크 액량을 축압하는 보조어큐뮬레이터를 포함하며, 브레이크 트랙션 제어 또는 차량 자세제어의 개시시 상기 전자제어장치는 상기 액압펌프를 구동시킴과 함께 상기 노멀클로즈형 유출밸브를 열어 상기 중압 어큐뮬레이터와 보조어큐뮬레이터에 축압된 브레이크 액압이 상기 휠 실린더에 공급되어 브레이크 트랙션 제어 또는 차량 자세 제어를 수행하게 하는 것을 특징으로 한다.The present invention for achieving the above object is provided with a master cylinder, a wheel cylinder provided on each wheel to exert a braking force by the brake hydraulic pressure, respectively provided on the inlet and outlet side of each wheel cylinder to control the flow of the brake hydraulic pressure Normally open solenoid inlet valve and normal closed solenoid outlet valve, a hydraulic pump for sucking brake fluid and discharging it to the wheel cylinder, and bypassing the discharge pressure from the discharge port of the hydraulic pump to the suction port side of the hydraulic pump. A brake hydraulic pressure control device including a medium pressure accumulator provided in a bypass flow path, in which a predetermined brake hydraulic pressure is accumulated, and an electronic control device for controlling brake hydraulic pressure delivered to each wheel cylinder, the brake hydraulic pressure control device comprising: a flow path between the hydraulic pump and the wheel cylinder; Normally closed outlet valve provided in branched flow path And an auxiliary accumulator for accumulating a predetermined amount of brake fluid, wherein the electronic control device drives the hydraulic pump and opens the normal closed type outlet valve at the start of brake traction control or vehicle attitude control. And the brake hydraulic pressure accumulated in the auxiliary accumulator is supplied to the wheel cylinder to perform brake traction control or vehicle attitude control.

이하에서는 본 발명의 바람직한 실시예를 본 도면을 참조하여 상세하게 설명하도록 한다.Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

도 2 는 본 발명에 따른 브레이크 액압 제어장치의 유압회로도이다. 도 2에 도시된바와 같이, 본 발명에 따른 브레이크 액압 제어장치는 전륜(FR, FL)과 후륜(RR, RL)에 각각 설치된 휠실린더(70a,70b,70c,70d)와, 운전석 일측에 마련된 브레이크 페달(51)과, 브레이크 페달(51)의 작동에 의해 진공과 대기와의 압력차이를 이용하여 작은 힘으로 큰 제동력을 발생시키는 배력장치(52)와, 브레이크액이 저장되는 오일저장탱크(54)와, 배력장치(52)로부터 증폭된 힘을 전달받아 휠 실린더(70a,70b,70c,70d)로 브레이크 액압을 공급하여 브레이크 작동을 일으키는 마스터실린더(53)로 구성되어 있다.2 is a hydraulic circuit diagram of a brake hydraulic pressure control device according to the present invention. As shown in FIG. 2, the brake hydraulic pressure control apparatus according to the present invention includes wheel cylinders 70a, 70b, 70c, and 70d installed at the front wheels FR and FL and the rear wheels RR and RL, respectively, and provided at one side of the driver's seat. The brake pedal 51, the power booster 52 which generates a large braking force with a small force by using the pressure difference between the vacuum and the atmosphere by the operation of the brake pedal 51, and an oil storage tank in which the brake fluid is stored ( 54 and a master cylinder 53 which receives the amplified force from the booster 52 and supplies brake hydraulic pressure to the wheel cylinders 70a, 70b, 70c, 70d to cause brake operation.

그리고, 마스터실린더(53)로부터 휠실린더(70a,70b,70c,70d)에 전달되는 브레이크 액압을 제어하기 위해 마스터실린더(53)와 휠실린더(70a,70b,70c,70d)와의 사이에는 노멀오픈형 솔레노이드 유입밸브(55a,55b,55c,55d)가 마련되고, 브레이크액이 휠 실린더(70a,70b,70c,70d)로부터 마스터실린더(53) 또는 노멀오픈형 솔레노이드 유입밸브(55a,55b,55c,55d)측으로 환류하는 유로에는 노멀클로즈형 솔레노이드 유출밸브(56a,56b,56c,56d)가 마련된다.Then, in order to control the brake hydraulic pressure transmitted from the master cylinder 53 to the wheel cylinders 70a, 70b, 70c, 70d, a normal open type is formed between the master cylinder 53 and the wheel cylinders 70a, 70b, 70c, 70d. Solenoid inlet valves 55a, 55b, 55c, 55d are provided, and brake fluid is supplied from the wheel cylinders 70a, 70b, 70c, 70d to the master cylinder 53 or to the normally open solenoid inlet valves 55a, 55b, 55c, 55d. Normally closed solenoid outlet valves 56a, 56b, 56c, and 56d are provided in the flow path returning to the side.

유출밸브(56a,56b,56c,56d)의 하류에는 이 유출밸브(56a,56b,56c,56d)를 통하여 마스터실린더(53) 또는 유입밸브(55a,55b,55c,55d)측으로 환류하는 브레이크 액을 잠시 저장하는 저압 어큐뮬레이터(57a,57b)와, 저압 어큐뮬레이터(57a,57b)에 저장된 브레이크액을 펌핑하여 강제로 환류시키는 액압펌프(58a,58b) 및 이 액압펌프(58a,58b)를 작동시키는 모터(59)와, 액압펌프(58a,58b)에 의해 펌핑된 브레이크액의 급격한 압력파형을 감소시키는 고압 어큐뮬레이터(60a,60b) 및 오리피스(61a,61b)가 마련된다.Downstream of the outlet valves 56a, 56b, 56c and 56d, the brake fluid is returned to the master cylinder 53 or the inlet valves 55a, 55b, 55c and 55d via the outlet valves 56a, 56b, 56c and 56d. Low pressure accumulators 57a and 57b for temporarily storing the oil, a hydraulic pump 58a and 58b for pumping brake fluid stored in the low pressure accumulators 57a and 57b and forcibly refluxing, and operating the hydraulic pumps 58a and 58b. Motor 59 and high pressure accumulators 60a and 60b and orifices 61a and 61b are provided for reducing the abrupt pressure waveform of brake fluid pumped by hydraulic pumps 58a and 58b.

또한, 차량의 센서(미도시)들로부터 차량정보를 읽어들여 미리 설정된 프로그램에 따라 연산, 분석, 판정하며, 그 결과에 의거하여 브레이크 액압 제어장치의 작동을 제어하는 전자제어장치(미도시)가 마련된다.In addition, an electronic control device (not shown) which reads vehicle information from sensors (not shown) of the vehicle, calculates, analyzes, and determines it according to a preset program, and controls the operation of the brake hydraulic pressure control device based on the result. Prepared.

한편, 액압펌프(58a,58b)의 토출포트와 마스터실린더(53)의 출구측을 연결하는 제 1유로(71a,71b)에는 노멀오픈형 제 1솔레노이드밸브(62a,62b)가 설치된다. 제 1솔레노이드밸브(62a,62b)는 평상시 개방된 상태를 유지하여 브레이크작동시 마스터실린더(53)에서 토출되는 브레이크액을 통과시켜 유입밸브(55a, 55b,55c,55d)를 거쳐 휠 실린더(70a,70b,70c,70d)로 전달되도록 하는 한편, 브레이크 트랙션 제어(Brake Traction Control) 및 차량자세 제어(Vehicle Dynamic Control)작동 중에는 전자제어장치에 의해 폐쇄된다.On the other hand, first open solenoid valves 62a and 62b are provided in the first flow paths 71a and 71b connecting the discharge ports of the hydraulic pumps 58a and 58b and the outlet side of the master cylinder 53. The first solenoid valves 62a and 62b are normally kept open so that the brake fluid discharged from the master cylinder 53 passes through the inlet valves 55a, 55b, 55c, and 55d during brake operation. 70b, 70c, and 70d, while closed by the electronic control device during brake traction control and vehicle dynamic control.

또한, 액압펌프(58a,58b)의 토출포트와 마스터실린더(53)의 출구측을 연결하는 또 다른 제 2유로(72a,72b)에는 제 1릴리프밸브(63a,63b)가 설치되는데, 이는 트랙션 제어 또는 차량자세 제어시 액압펌프(58a,58b)에서 토출되는 브레이크액압이 필요이상으로 상승되는 경우 브레이크액을 마스터실린더(53)로 환류시키기 위한 것이다. In addition, the first relief valves 63a and 63b are installed in the second flow passages 72a and 72b connecting the discharge ports of the hydraulic pumps 58a and 58b and the outlet side of the master cylinder 53, which is traction. When the brake fluid pressure discharged from the hydraulic pumps 58a and 58b rises more than necessary during the control or vehicle attitude control, the brake fluid is returned to the master cylinder 53.                     

마스터실린더(53)의 출구측과 액압펌프(58a,58b)의 흡입포트에는 이들을 연결하는 별도의 제 3유로(73a,73b)가 설치되어 있는데, 이 제 3유로(73a,73b)상에는 노멀오픈형 일렉트릭 셔틀밸브(64a,64b)가 마련된다.In the outlet side of the master cylinder 53 and the suction ports of the hydraulic pumps 58a and 58b, separate third flow paths 73a and 73b are provided for connecting them, which are normally open on the third flow paths 73a and 73b. Electric shuttle valves 64a and 64b are provided.

한편, 액압펌프(58a,58b)의 토출포트로부터의 토출압을 액압펌프(58a,58b)의 흡입포트측으로 바이패스시키는 바이패스유로(74a,74b)가 설치되는데, 이 바이패스유로(74a,74b)에는 소정의 액압이 축압되는 중압 어큐뮬레이터(66a,66b)가 마련되어 있다. 그리고, 중압 어큐뮬레이터(66a,66b)와 액압펌프(58a,58b)의 흡입포트사이의 바이패스유로(74a,74b)상에는 중압 어큐뮬레이터(66a,66b)에 축압된 액압을 일정하게 유지시키며 브레이크 트랙션 제어 또는 차량자세 제어시 개방되어 중압 어큐뮬레이터(66a,66b)와 액압펌프(58a,58b)의 흡입포트를 연통시키는 노멀클로즈형 제 2솔레노이드밸브(67a,67b)가 마련되고, 액압펌프(58a,58b)의 토출포트와 중압 어큐뮬레이터(66a,66b)사이의 바이패스유로(74a,74b)상에는 브레이크 트랙션 제어 또는 차량자세 제어시 액압펌프(58a,58b)에서 토출되는 브레이크액압이 제어에 필요한 소정압 이상으로 상승하면 브레이크액을 중압 어큐뮬레이터(66a,66b)로 환류 축압시키는 제 2릴리프밸브(65a,65b)가 마련된다.On the other hand, bypass passages 74a and 74b for bypassing the discharge pressure from the discharge ports of the hydraulic pumps 58a and 58b to the suction port side of the hydraulic pumps 58a and 58b are provided. 74b) is provided with the medium pressure accumulators 66a and 66b in which the predetermined hydraulic pressure is accumulated. Then, on the bypass flow paths 74a and 74b between the medium pressure accumulators 66a and 66b and the suction ports of the hydraulic pumps 58a and 58b, the hydraulic pressure accumulated in the medium pressure accumulators 66a and 66b is kept constant and brake traction control is performed. Alternatively, second closed solenoid valves 67a and 67b which are opened during vehicle attitude control to communicate the medium pressure accumulators 66a and 66b and the suction ports of the hydraulic pumps 58a and 58b are provided, and the hydraulic pumps 58a and 58b are provided. The brake fluid pressure discharged from the hydraulic pumps 58a and 58b during brake traction control or vehicle attitude control is greater than or equal to the predetermined pressure necessary for the control on the bypass flow paths 74a and 74b between the discharge port of the discharge port and the intermediate pressure accumulators 66a and 66b. Ascending to this, second relief valves 65a and 65b are provided, which accumulate and reflux the brake fluid to the medium pressure accumulators 66a and 66b.

도 2에서의 브레이크 액압 제어장치의 가장 핵심부분인 액압펌프(58a,58b)와 휠 실린더(70a,70b,70c,70d)사이의 유로(75a,75b)에 분기한 보조유로(76a,76b)에는 노멀클로형 보조유출밸브(77a,77b)를 중개하여 보조어큐뮬레이터(78a,78b)가 마련되어 있다.Auxiliary flow paths 76a and 76b branched into the flow paths 75a and 75b between the hydraulic pumps 58a and 58b, which are the most essential parts of the brake hydraulic pressure control device in FIG. 2, and the wheel cylinders 70a, 70b, 70c and 70d. The subsidiary accumulators 78a and 78b are provided by intermediating normal claw auxiliary outlet valves 77a and 77b.

차량이 출고된 후나 장기간 주행하지 않은 경우에는 중압 어큐뮬레이터(66a,66b)에 액량이 제 2 릴리프밸브(65a,65b) 및 노멀클로즈형 제 2솔레노이드밸브(67a,67b)를 통해 누출되는 현상이 발생할 뿐만 아니라, 중압 어큐뮬레이터(66a,66b)에 충분한 액량이 축압되어 있다고 해도 중압 어큐뮬레이터(66a,66b)와 휠 실린더(70a,70b,70c,70d)사이의 유로의 길이가 길어 초기 압력증가시 압력이 증가율이 낮아지는 현상이 발생할 수 있다. After the vehicle has been shipped or if the vehicle has not been driven for a long time, liquid leakage from the medium pressure accumulators 66a and 66b may occur through the second relief valves 65a and 65b and the normally closed second solenoid valves 67a and 67b. In addition, even if a sufficient amount of liquid is accumulated in the medium pressure accumulators 66a and 66b, the length of the flow path between the medium pressure accumulators 66a and 66b and the wheel cylinders 70a, 70b, 70c, and 70d is long. The increase rate may decrease.

이러한 문제점을 해결하기 위해 중압 어큐뮬레이터 및 보조어큐뮬레이터(78a,78b)에 액량을 축압한 후 차량 자세제어시 휠 실린더에서의 압력증가율을 증가시키는 동작을 도 2를 참조하여 살펴보면, 전자제어장치는 우선적으로 차량에 시동을 걸 때, 상술한 바와 같이 노멀오픈형 솔레노이드 유입밸브(55a,55b,55c,55d)와 노멀오픈형 제 1솔레노이드밸브(62a,62b)를 폐쇄시키고, 액압펌프(58a,58b)를 구동시켜 마스터실린더(53)내의 브레이크액을 일렉트릭 셔틀밸브(64a,64b)를 통해 흡입한 후 토출하여 제 2릴리프밸브(65a,65b)를 통해 중압 어큐뮬레이터(66a,66b)로 축압시킨다. 이와 동시에 마스터실린더(53)와 휠 실린더(70a,70b,70c,70d)사이의 유로(75a,75b)에 분기한 보조유로(76a,76b)상의 노멀클로형 보조유출밸브(77a,77b)를 함께 열어 보조어큐뮬레이터(78a,78b)에 액량을 축압시킨다. 축압이 완료되면, 노멀클로형 보조유출밸브(77a,77b)를 폐쇄시켜 보조어큐뮬레이터(78a,78b)내에 브레이크 액량이 축압된 상태로 저장되게 한다.In order to solve this problem, after accumulating the liquid amount in the medium pressure accumulator and the auxiliary accumulators 78a and 78b, the operation of increasing the pressure increase rate in the wheel cylinder during vehicle attitude control will be described with reference to FIG. 2. When starting the vehicle, the normal open solenoid inlet valves 55a, 55b, 55c and 55d and the normal open first solenoid valves 62a and 62b are closed as described above, and the hydraulic pumps 58a and 58b are driven. Then, the brake fluid in the master cylinder 53 is sucked through the electric shuttle valves 64a and 64b and discharged to accumulate the medium pressure accumulators 66a and 66b through the second relief valves 65a and 65b. At the same time, the normal claw auxiliary outlet valves 77a and 77b on the auxiliary flow paths 76a and 76b branched to the flow paths 75a and 75b between the master cylinder 53 and the wheel cylinders 70a, 70b, 70c and 70d. Open together and accumulate the liquid amount in the auxiliary accumulators 78a and 78b. When the pressure accumulation is completed, the normal claw auxiliary outlet valves 77a and 77b are closed to store the brake fluid amount in the pressure accumulator state in the auxiliary accumulators 78a and 78b.

차량 자세제어시 액압펌프(58a,58b)를 구동시켜 해당 휠 실린더에 브레이크 액압을 공급함과 함께, 노멀클로형 보조유출밸브(77a,77b)를 함께 열어 보조어큐뮬레이터(78a,78b)내에 축압된 브레이크 액압이 액압펌프(58a,58b)에 의해 공급된 브 레이크 액압과 함께 해당 휠 실린더에 공급되게 함으로서 액압펌프(58a,58b)와 휠 실린더(70a,70b,70c,70d)의 유로의 길이가 길더라도 초기 압력증가율이 향상되게 된다. In the vehicle attitude control, the hydraulic pumps 58a and 58b are driven to supply brake hydraulic pressure to the wheel cylinders, and the normal claw auxiliary outlet valves 77a and 77b are opened together to accumulate brakes in the auxiliary accumulators 78a and 78b. The hydraulic pressure is supplied to the corresponding wheel cylinder together with the brake hydraulic pressure supplied by the hydraulic pumps 58a and 58b so that the flow paths of the hydraulic pumps 58a and 58b and the wheel cylinders 70a, 70b, 70c and 70d are long. Initial pressure increase rate is improved.

이상에서 상세히 설명한 바와 같이, 본 발명은 보조어큐뮬레이터와 액압펌프에 의한 브레이크 액압을 해당 휠 실린더에 제공함으로서 초기 압력증가속도를 향상시키는 효과가 있다. As described in detail above, the present invention has the effect of improving the initial pressure increase speed by providing the brake cylinder pressure by the auxiliary accumulator and the hydraulic pump to the wheel cylinder.

Claims (2)

마스터실린더와, 각 차륜에 마련되어 브레이크 액압에 의해 제동력을 발휘하는 휠 실린더와, 상기 각 휠 실린더의 입구측과 출구측에 각각 마련되어 브레이크 액압의 흐름을 제어하는 노멀오픈형 솔레노이드 유입밸브 및 노멀클로즈형 솔레노이드 유출밸브와, 브레이크액을 흡입하여 상기 휠 실린더로 토출하는 액압펌프와, 상기 액압펌프의 토출포트로부터의 토출압을 상기 액압펌프의 흡입포트측으로 바이패스시키는 바이패스유로에 마련되어 소정의 브레이크 액압이 축압되는 중압 어큐뮬레이터, 상기 각 휠 실린더에 전달되는 브레이크 액압을 제어하는 전자제어장치를 구비하는 브레이크 액압 제어장치에 있어서,.A master cylinder, a wheel cylinder provided on each wheel to exert braking force by brake hydraulic pressure, a normally open solenoid inlet valve and a normal closed solenoid provided on the inlet and outlet sides of each wheel cylinder to control the flow of brake hydraulic pressure, respectively. A predetermined brake hydraulic pressure is provided in an outlet valve, a hydraulic pump for sucking brake fluid and discharging it to the wheel cylinder, and a bypass passage for bypassing the discharge pressure from the discharge port of the hydraulic pump to the suction port side of the hydraulic pump. A brake hydraulic pressure control device comprising a medium pressure accumulator to be accumulated and an electronic controller for controlling brake hydraulic pressure transmitted to each wheel cylinder. 상기 액압펌프와 휠 실린더사이의 유로에 분기된 유로에 마련되어 노멀클로즈형 유출밸브를 중개하여 소정의 브레이크 액량을 축압하는 보조어큐뮬레이터를 포함하며, And an auxiliary accumulator provided in a flow path branched between the hydraulic pump and the wheel cylinder to mediate a normal closed flow valve to accumulate a predetermined amount of brake fluid. 브레이크 트랙션 제어 또는 차량 자세제어의 개시시 상기 전자제어장치는 상기 액압펌프를 구동시킴과 함께 상기 노멀클로즈형 유출밸브를 열어 상기 중압 어큐뮬레이터와 보조어큐뮬레이터에 축압된 브레이크 액압이 상기 휠 실린더에 공급되어 브레이크 트랙션 제어 또는 차량 자세 제어를 수행하게 하는 것을 특징으로 하는 브레이크 액압 제어장치.At the start of brake traction control or vehicle attitude control, the electronic controller drives the hydraulic pump and opens the normal closed type outlet valve to supply brake hydraulic pressure accumulated in the medium pressure accumulator and the auxiliary accumulator to the wheel cylinder to brake the brake. A brake hydraulic pressure control device for performing traction control or vehicle attitude control. 제 1항에 있어서,The method of claim 1, 상기 중압 어큐뮬레이터에 브레이크 액량의 축압시 상기 전자제어장치는 노멀클로즈형 유출밸브를 열어 상기 보조어큐뮬레이터에도 브레이크 액량을 함께 축압하는 것을 특징으로 하는 브레이크 액압 제어장치.And when the brake fluid amount is accumulated in the medium pressure accumulator, the electronic control device opens a normal closed flow valve to accumulate the brake fluid amount in the auxiliary accumulator together.
KR1020020007308A 2002-02-08 2002-02-08 Apparatus of controlling brake' oil pressure in vehicle KR100774116B1 (en)

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