KR20020004179A - flow control device and thereof method of speed induction type power steering system - Google Patents

flow control device and thereof method of speed induction type power steering system Download PDF

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Publication number
KR20020004179A
KR20020004179A KR1020000037783A KR20000037783A KR20020004179A KR 20020004179 A KR20020004179 A KR 20020004179A KR 1020000037783 A KR1020000037783 A KR 1020000037783A KR 20000037783 A KR20000037783 A KR 20000037783A KR 20020004179 A KR20020004179 A KR 20020004179A
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South Korea
Prior art keywords
flow rate
steering
wheel
speed
flow
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KR1020000037783A
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Korean (ko)
Inventor
이성호
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배길훈
한국델파이주식회사
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Priority to KR1020000037783A priority Critical patent/KR20020004179A/en
Publication of KR20020004179A publication Critical patent/KR20020004179A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D6/00—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits
    • B62D6/08—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits responsive only to driver input torque
    • B62D6/10—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits responsive only to driver input torque characterised by means for sensing or determining torque
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
    • B62D5/07—Supply of pressurised fluid for steering also supplying other consumers ; control thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2300/00—Purposes or special features of road vehicle drive control systems
    • B60Y2300/02—Control of vehicle driving stability

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Steering Control In Accordance With Driving Conditions (AREA)

Abstract

PURPOSE: A flow control device of a power steering and a method thereof are provided to prevent catch-up by increasing flow rate from a pump momentarily in steering suddenly during high-speed traveling, and to stabilize a system by reducing the flow rate of the pump slowly after steering suddenly. CONSTITUTION: A flow regulator improves steering performance by controlling flow from a pump according to vehicle speed proportionally. The vehicle speed and RPM(Revolution Per Minute) of a wheel are detected with a vehicle speed sensor and a wheel RPM sensor(S101). The rpm of the wheel is detected to be more than the critical value(S102), and the flow rate of the oil pump is increased momentarily with operating a solenoid valve in case of the rpm of the wheel to be over the critical value in steering suddenly(S103). The catch-up owing to shortage of output flow is prevented with compensating the flow in steering suddenly. An electronic control unit stabilizes the system by reducing flow slowly after increasing flow(S104). The flow rate is controlled proportionally according to vehicle speed in case of the rpm of the wheel to be less than the critical value(S105).

Description

속도감응형 파워 스티어링의 유량제어장치 및 그 방법{flow control device and thereof method of speed induction type power steering system}Flow control device of speed-sensitive power steering and method thereof {flow control device and equation method of speed induction type power steering system}

본 발명은 펌프에서 출력되는 유량을 제어하여 파워 스티어링 기어박스의 토크를 제어하는 속력감응형 파워 스티어링의 유량 제어장치 및 그 방법에 관한 것으로서, 더욱 상세하게는 스티어링휠의 회전속도를 검출하여 고속주행중 급조향시 작아진 오일펌프의 출력유량을 순간적으로 높여 보상함으로써 급조향시 유량이 갑자기 작아짐에 따른 캐치업(catch-up)현상을 방지하며, 급조향후 펌프의 출력유량을 점진적으로 감소시킴으로써 운전자 및 시스템이 안정되도록 하는 속도감응형 파워 스티어링의 유량제어장치 및 그 방법에 관한 것이다.The present invention relates to a flow rate control device for speed-sensitive power steering and a method for controlling the torque of the power steering gearbox by controlling the flow rate output from the pump, and more particularly, by detecting the rotational speed of the steering wheel during high-speed driving Instantly increases the output flow rate of the reduced oil pump during sudden steering to prevent catch-up due to the sudden decrease in flow during sudden steering, and gradually reduces the output flow of the pump after sudden steering. The present invention relates to a flow rate control device for a speed-sensitive power steering and to a method for ensuring a stable system.

일반적으로 차량의 대형화 및 저압 타이어를 사용하면 앞바퀴의 접지 저항이 크게 되므로 조향 조작력이 증대되기 때문에 신속한 조향 조작이 곤란하게 된다. 따라서, 스티어링휠의 가볍고 원활한 조향 조작을 하기 위하여 엔진의 동력으로 오일펌프를 구동시켜 발생한 유압을 이용하는 파워 스티어링을 구비하여 스티어링휠의 조작력을 가볍게 한다.In general, when the vehicle is enlarged and the low pressure tire is used, the ground resistance of the front wheel is increased, so that the steering operation force is increased, so that it is difficult to quickly operate the steering wheel. Therefore, in order to perform a light and smooth steering operation of the steering wheel, a power steering using hydraulic pressure generated by driving the oil pump with the power of the engine is provided to reduce the operating force of the steering wheel.

상기한 파워 스티어링의 장점으로는 보다 적은 힘으로 조향 조작을 하고, 조향 조작력에 관계없이 조향 기어비를 선정하며, 노면의 충격을 흡수하여 스티어링 휠에 전달하는 현상을 방지하고, 앞바퀴의 시미모션(shimmy motion)을 방지하는 것이다.Advantages of the above power steering include steering operation with less force, selecting the steering gear ratio regardless of steering operation force, preventing the transmission of shock to the steering wheel by absorbing the impact of the road surface, and the shimmy motion of the front wheel. to prevent motion.

상기와 같은 파워 스티어링은 작동부와, 제어부와, 동력부로 구성되어 있는 바, 작동부는 유압을 기계적 에너지로 변경하여 앞바퀴의 조향을 발생시키는 부분으로써, 주로 복동식 파워 실린더를 사용하며, 제어부는 스티어링휠의 조작으로 작동부의 오일 회로를 개폐하는 밸브이며, 제어 밸브가 오일 회로를 바꾸어 파워 실린더의 작동 방향과 작동 상태를 제어한다. 또한, 동력부는 동력원이 되는 유압을 발생시키는 부분으로 엔진에 의해 구동되는 오일 펌프로 구성되어 있다.The power steering as described above is composed of an operation unit, a control unit, and a power unit, the operation unit is a part that generates steering of the front wheel by changing the hydraulic pressure into mechanical energy, and mainly uses a double-acting power cylinder, the control unit is a steering It is a valve that opens and closes the oil circuit of the operating part by the operation of the wheel, and the control valve changes the oil circuit to control the operation direction and operating state of the power cylinder. In addition, the power unit is a portion for generating the hydraulic pressure to be a power source is composed of an oil pump driven by the engine.

최근 파워 스티어링에는 차속에 따라 유압펌프에서 펌핑되어 파워 실린더로 공급되는 압유의 공급유량을 차속에따라 비례적으로 제어해서 운전자가 적절한 조향감각을 얻을 수 있도록 속도감응형 파워 스티어링을 구성하는 유량제어장치로 구비되어 있다.Recently, power steering is a flow control device that configures a speed-sensitive power steering so that the driver can obtain proper steering feeling by proportionally controlling the supply flow rate of the hydraulic oil pumped from the hydraulic pump according to the vehicle speed according to the vehicle speed. It is provided with.

도 1은 종래 파워 스티어링의 유량 제어장치를 보인 것으로서, 오일펌프로부터 제어밸브를 통해 스티어링 기어박스쪽으로 출력되는 유량을 제어하는 솔레노이드밸브(110), 즉 배리어블 프레서 레귤레이터(variable pressure regulator)와, 차량의 속도를 검출하는 차속센서(120) 및, 그 차속센서(120)로부터 입력되는 차량의 속도에 따라 솔레노이드밸브(110)를 제어하는 전자제어유닛(ECU; 130)을 포함하여 구성되어 있다.1 is a flow rate control device of a conventional power steering, a solenoid valve 110 for controlling the flow rate output from the oil pump through the control valve toward the steering gear box, that is, a variable pressure regulator (variable pressure regulator), And a vehicle speed sensor 120 for detecting the speed of the vehicle and an electronic control unit (ECU) 130 for controlling the solenoid valve 110 according to the speed of the vehicle input from the vehicle speed sensor 120.

이와 같이 구성되는 종래 파워 스티어링의 유량 제어장치에 따르면, 정차시에는 차량이 정지된 상태이므로 그 신호가 차속센서(120)를 통해 전자제어유닛(130)으로 전달되며, 따라서 솔레노이드밸브(110)를 개방하여 전체적인 펌프의 토출 유량이 그대로 파워 실린더로 향하게 한다.According to the conventional flow control device of the power steering configured as described above, the signal is transmitted to the electronic control unit 130 through the vehicle speed sensor 120 when the vehicle is stopped, so that the solenoid valve 110 Open to direct the discharge flow rate of the overall pump to the power cylinder.

한편, 차량의 속도가 점차로 증가하면, 차량의 차속이 차속센서에 의해 감지되며, 그 신호가 전자제어유닛(130)으로 전달된다. 이때, 솔레노이드밸브(110)는 오리피스를 통과하는 유량 즉, 펌프로부터 파워 실린더로 출력되는 유량을 차속에 비례적으로 저감시켜 고속주행시에는 스티어링기어박스의 토크가 증대되도록 함으로써 스티어링휠의 조작력이 무겁도록 하여 조타감이 안정되도록 한다.On the other hand, if the speed of the vehicle gradually increases, the vehicle speed of the vehicle is detected by the vehicle speed sensor, and the signal is transmitted to the electronic control unit 130. At this time, the solenoid valve 110 reduces the flow rate through the orifice, that is, the flow rate output from the pump to the power cylinder in proportion to the vehicle speed so that the torque of the steering gear box increases during high-speed driving so that the operating force of the steering wheel is heavy. To stabilize the steering.

그런데, 상술한 바와 같은 종래 파워 스티어링의 유량 제어장치는 단순히 차속에 따라 오일펌프의 출력유량을 비례적으로 제어하도록 구성됨으로써 출력유량이 작은 고속주행중 급조향할 경우 유량부족으로 인해 캐치업 현상(급격한 스티어링휠 조작시 유량부족 등으로 조향이 되지 않는 현상)이 발생되어 자칫 안전사고를 초래할 수 있게 되는 문제점이 있다.However, the flow control apparatus of the conventional power steering as described above is simply configured to proportionally control the output flow rate of the oil pump according to the vehicle speed. The phenomenon that steering is not performed due to lack of flow rate during wheel operation) occurs, which causes a safety accident.

따라서, 본 발명은 상기와 같은 문제점을 감안하여 안출된 것으로서, 그 목적은 고속주행중 급조향시 작아진 펌프의 출력유량을 순간적으로 높여 보상함으로써 급조향시 유량이 갑자기 작아짐에 따른 캐치업현상을 방지하는 속도감응형 파워 스티어링의 유량제어장치 및 그 방법을 제공하는 데 그 목적이 있다.Accordingly, the present invention has been made in view of the above problems, and its purpose is to prevent the catch-up phenomenon due to the sudden decrease in the flow rate during sudden steering by compensating the output flow rate of the pump which is reduced during the rapid steering during high speed driving. It is an object of the present invention to provide a flow rate control device for speed-sensitive power steering and a method thereof.

또한, 본 발명은 또다른 목적은 급조향후 펌프의 출력유량을 점진적으로 감소시킴으로써 운전자 및 시스템이 안정되도록 하는 속도감응형 파워 스티어링의 유량제어장치 및 그 방법을 제공하는 데 그 목적이 있다.In addition, another object of the present invention is to provide a flow rate control device and a method for controlling the speed of the power steering to stabilize the driver and the system by gradually reducing the output flow rate of the pump after the rapid steering.

도 1은 종래 속도감응형 파워 스티어링의 유량제어장치를 보인 블록 구성도.1 is a block diagram showing a flow control device of a conventional speed-sensitive power steering.

도 2는 본 발명의 실시예에 따른 속도감응형 파워 스티어링의 유량제어장치를 보인 블록 구성도.Figure 2 is a block diagram showing a flow control device of a speed-sensitive power steering according to an embodiment of the present invention.

도 3은 본 발명의 실시예에 따른 속도감응형 파워 스티어링의 유량제어과정을 보인 플로 차트.3 is a flow chart showing a flow control process of the speed-sensitive power steering according to an embodiment of the present invention.

* 도면의 주요 부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings

10 : 솔레노이드밸브 20 : 차속센서10: solenoid valve 20: vehicle speed sensor

30 : 휠속도센서 40 : 전자제어유닛30: wheel speed sensor 40: electronic control unit

상기와 같은 목적을 달성하기 위한 본 발명의 특징에 따르면, 오일펌프로부터 제어밸브를 통해 스티어링 기어박스쪽으로 출력되는 유량을 제어하는 솔레노이드밸브와, 차량의 속도를 검출하는 차속센서와, 조향휠의 회전속도를 검출하는 휠속도센서와, 상기 차속센서와 상기 휠속도센서로부터 입력되는 신호에 따라 솔레노이드밸브를 제어하는 전자제어유니트를 포함하는 속도감응형 파워 스티어링의 유량제어장치 및 ;According to a feature of the present invention for achieving the above object, the solenoid valve for controlling the flow rate output from the oil pump to the steering gear box through the control valve, the vehicle speed sensor for detecting the speed of the vehicle, the rotation of the steering wheel A flow rate control device for a speed-sensitive power steering comprising a wheel speed sensor for detecting a speed, and an electronic control unit for controlling a solenoid valve according to a signal input from the vehicle speed sensor and the wheel speed sensor;

오일펌프로부터 출력되는 유량을 솔레노이드밸브를 통해 제어하는 속도감응형 파워 스티어링의 유량제어방법에 있어서, 차속센서와 휠속도센서를 통해 차속 및 휠회전속도를 검출하는 제 1단계와, 상기 검출된 휠회전속도가 임계치보다 높은지를 판단하는 제 2단계와, 상기 검출된 휠회전속도가 임계치보다 높을 경우 유량을 증가시키고 낮을 경우 상기 검출된 차속에 따라 유량을 비례제어하는 제3단계를 포함하는 속도감응형 파워 스티어링의 유량제어방법을 각각 제공한다.A flow rate control method of a speed-sensitive power steering that controls a flow rate output from an oil pump through a solenoid valve, the first step of detecting a vehicle speed and a wheel rotation speed through a vehicle speed sensor and a wheel speed sensor, and the detected wheel A second step of determining whether the rotational speed is higher than a threshold, and a third step of increasing the flow rate when the detected wheel rotational speed is higher than the threshold and proportionally controlling the flow rate according to the detected vehicle speed when the detected wheel rotational speed is higher than the threshold. Provides a flow control method for the power steering.

그리고, 상기와 같은 또다른 목적을 달성하기 위한 본 발명의 특징에 따르면, 상기 제 3단계에서 유량을 증가후 일정시간 경과한 다음 소정시간동안 유량을 감소시키는 제 4단계를 더 포함하는 속도감응형 파워 스티어링의 유량제어방법을 제공한다.Further, according to a feature of the present invention for achieving the above another object, the speed-sensitive type further comprises a fourth step of decreasing the flow rate for a predetermined time after a certain time after increasing the flow rate in the third step Provides a flow control method for power steering.

이하, 본 발명의 실시예를 첨부도면에 의거 더욱 상세히 설명하면 다음과 같다.Hereinafter, an embodiment of the present invention will be described in more detail based on the accompanying drawings.

도 2는 본 발명의 실시예에 따른 속도감응형 파워 스티어링의 유량제어장치를 보인 것이다. 이 유량제어장치는 오일펌프로부터 출력되는 유량을 차속에 따라 비례 제어하여 운전자가 적절한 조향감각을 얻을 수 있도록 하는 기본 구성을 갖는 바, 오일펌프로부터 제어밸브(10)를 통해 스티어링 기어박스쪽으로 출력되는 유량을 제어하는 솔레노이드밸브(10)와, 차량의 속도를 검출하는 차속센서(20)와, 조향휠의 회전속도를 검출하는 휠속도센서(30)와, 차속센서(20)와 휠속도센서(30)로부터 입력되는 신호에 따라 솔레노이드밸브(10)를 제어하는 전자제어유닛(40)으로 구성된다.Figure 2 shows the flow rate control device of the speed-sensitive power steering according to an embodiment of the present invention. This flow control device has a basic configuration to proportionally control the flow rate output from the oil pump according to the vehicle speed so that the driver can obtain a proper steering sense, which is output from the oil pump to the steering gear box through the control valve (10) Solenoid valve 10 for controlling the flow rate, vehicle speed sensor 20 for detecting the speed of the vehicle, wheel speed sensor 30 for detecting the rotational speed of the steering wheel, vehicle speed sensor 20 and the wheel speed sensor ( It consists of an electronic control unit 40 for controlling the solenoid valve 10 in accordance with the signal input from 30.

상기 휠속도센서(30)는 스티어링휠에 설치되어 분당 스티어링휠의 회전수 즉, RPM을 검출하게 된다. 그리고, 전자제어유닛(40)은 휠회전속도가 50 ~ 80 RPM 정도로 검출될 경우 급격한 조향 즉 급조향으로 판단하게 되며, 고속주행중 급조향 판단시에는 오일펌프의 출력유량을 순간적으로 높여 보상하고, 급조향후 펌프의 출력유량을 약 1 ~ 2초간 점진적으로 감소시키도록 구성된다.The wheel speed sensor 30 is installed in the steering wheel to detect the rotational speed of the steering wheel per minute, that is, RPM. When the wheel rotation speed is detected at about 50 to 80 RPM, the electronic control unit 40 determines the sudden steering, that is, the sudden steering. When the sudden steering is determined during high-speed driving, the electronic control unit 40 temporarily increases the output flow rate of the oil pump, and compensates for it. It is configured to gradually reduce the output flow rate of the pump for about 1 to 2 seconds after steep steering.

이와 같이 구성되는 본 발명의 실시예에 따른 속도감응형 파워 스티어링의 유량제어과정을 살펴보면 다음과 같다.Looking at the flow control process of the speed-sensitive power steering according to an embodiment of the present invention configured as described above are as follows.

도 3에 도시되는 바와 같이 우선, 전자제어유닛(40)은 스텝 S101에서 차속센서(20)와 휠속도센서(30)를 통해 차속 및 휠회전속도를 검출하고, 스텝 S102를 진행하여 검출된 휠회전속도가 급조향에 따른 휠회전속인 임계치(예를들어 70RPM)보다 높은지를 판단한다. 이때, 운전자의 급조향으로 인해 휠회전속도로부터 검출된 휠회전속도가 임계치보다 높을 경우로 판단될 경우 스텝 S103을 진행하게 된다.As shown in FIG. 3, the electronic control unit 40 first detects the vehicle speed and the wheel rotation speed through the vehicle speed sensor 20 and the wheel speed sensor 30 in step S101, and proceeds to step S102 to detect the wheel. It is determined whether the rotation speed is higher than a threshold value (for example, 70 RPM), which is a wheel rotation speed according to the steer steering. At this time, when it is determined that the wheel rotation speed detected from the wheel rotation speed due to the driver's sudden steering is higher than the threshold value, step S103 is performed.

상기 스텝 S103에서는 솔레노이드밸브(10)를 동작시켜 오일펌프로부터 출력되는 유량을 순간적으로 높여 보상된다. 이에 따라, 급조향시 출력 유량의 부족으로 발생되는 캐치업 현상을 방지할 수 있게 된다.In step S103, the solenoid valve 10 is operated to temporarily increase the flow rate output from the oil pump to compensate. Accordingly, it is possible to prevent the catch-up phenomenon caused by the lack of output flow rate during rapid steering.

그 후, 스텝 S104를 진행하게 되는 바, 이때 전자제어유닛(40)은 유량을 증가후 일정시간 경과하게 되면 1 ~ 2초안 유량을 점진적으로 감소시킴으로써, 급조향이 끝난 후 다시 고속에서 유량을 갑자기 작게 함에 따른 운전자 및 시스템에 무리가 가는 것을 방지할 수 있게 된다.Thereafter, the process proceeds to step S104. At this time, the electronic control unit 40 gradually decreases the flow rate within 1 to 2 seconds after a certain time after increasing the flow rate, so that the flow rate suddenly decreases again at a high speed after the end of rapid steering. As a result, it is possible to prevent the driver and the system from entering the system.

한편, 전자제어유닛(40)은 스텝 S102에서 검출된 휠회전속도가 임계치보다 낮을 경우로 판단된 경우에는 스텝 S105를 진행하여 차속에 따라 유량을 비례제어하는 는 일반적인 속도감응형 모드를 수행하게 된다.On the other hand, if it is determined that the wheel rotation speed detected in step S102 is lower than the threshold, the electronic control unit 40 proceeds to step S105 to perform a general speed sensitive mode in which the flow rate is proportionally controlled according to the vehicle speed. .

이상에서 살펴본 바와 같이, 본 발명은 스티어링휠의 회전속도를 검출하여 고속주행중 급조향시 작아진 펌프의 출력유량을 순간적으로 높여 보상함으로써 급조향시 유량이 갑자기 작아짐에 따른 캐치업현상을 방지하며, 급조향후 펌프의 출력유량을 점진적으로 감소시킴으로써 운전자 및 시스템이 안정되도록 한다.As described above, the present invention detects the rotational speed of the steering wheel to instantly compensate the output flow rate of the pump reduced during high speed steering during high-speed driving to prevent the catch-up phenomenon due to the sudden decrease in the flow rate during rapid steering, After steep steering, the output flow of the pump is gradually reduced to stabilize the operator and the system.

본 발명은 특정의 실시예와 관련하여 도시 및 설명하였지만, 첨부 특허청구범위에 의해 나타난 발명의 사상 및 영역으로부터 벗어나지 않는 한도 내에서 다양한 개조 및 변화가 가능하다는 것을 당업계에서 통상의 지식을 가진 자라면 누구나 쉽게 알 수 있을 것이다.While the invention has been shown and described with respect to particular embodiments, those skilled in the art will recognize that various modifications and changes can be made without departing from the spirit and scope of the invention as indicated by the appended claims. Anyone can easily know.

Claims (3)

오일펌프로부터 제어밸브를 통해 스티어링 기어박스쪽으로 출력되는 유량을 제어하는 솔레노이드밸브와, 차량의 속도를 검출하는 차속센서와, 조향휠의 회전속도를 검출하는 휠속도센서와, 상기 차속센서와 상기 휠속도센서로부터 입력되는 신호에 따라 솔레노이드밸브를 제어하는 전자제어유니트를 포함하는 것을 특징으로 하는 속도감응형 파워 스티어링의 유량제어장치.A solenoid valve for controlling the flow rate output from the oil pump to the steering gearbox through the control valve, a vehicle speed sensor for detecting the speed of the vehicle, a wheel speed sensor for detecting the rotational speed of the steering wheel, the vehicle speed sensor and the wheel A flow control device for a speed-sensitive power steering, comprising an electronic control unit for controlling the solenoid valve in accordance with a signal input from a speed sensor. 오일펌프로부터 출력되는 유량을 솔레노이드밸브를 통해 제어하는 속도감응형 파워 스티어링의 유량제어방법에 있어서,In the flow rate control method of the speed-sensitive power steering to control the flow rate output from the oil pump through the solenoid valve, 차속센서과 휠속도센서를 통해 차속 및 휠회전속도를 검출하는 제 1단계와, 상기 검출된 휠회전속도가 임계치보다 높은지를 판단하는 제 2단계와, 상기 검출된 휠회전속도가 임계치보다 높을 경우 유량을 증가시키고 낮을 경우 상기 검출된 차속에 따라 유량을 비례제어하는 제3단계를 포함하는 것을 특징으로 하는 속도감응형 파워 스티어링의 유량제어방법.A first step of detecting a vehicle speed and a wheel rotation speed through a vehicle speed sensor and a wheel speed sensor; a second step of determining whether the detected wheel rotation speed is higher than a threshold; and a flow rate if the detected wheel rotation speed is higher than a threshold. And increasing and decreasing the flow rate proportionally according to the detected vehicle speed. 제 2항에 있어서,The method of claim 2, 상기 제 3단계에서 유량을 증가후 일정시간 경과한 다음 소정시간동안 유량을 점진적으로 감소시키는 제 4단계를 더 포함하는 것을 특징으로 하는 속도감응형 파워 스티어링의 유량제어방법.And a fourth step of gradually decreasing the flow rate for a predetermined time after the predetermined time has passed after increasing the flow rate in the third step.
KR1020000037783A 2000-07-03 2000-07-03 flow control device and thereof method of speed induction type power steering system KR20020004179A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR970074487A (en) * 1996-05-28 1997-12-10 오상수 Control method of power steering
KR970074486A (en) * 1996-05-28 1997-12-10 오상수 Control method of power steering
KR980001631A (en) * 1996-06-25 1998-03-30 김영귀 Vehicle anti-rotation system and control method
KR19990034983A (en) * 1997-10-31 1999-05-15 양재신 Power steering aid

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR970074487A (en) * 1996-05-28 1997-12-10 오상수 Control method of power steering
KR970074486A (en) * 1996-05-28 1997-12-10 오상수 Control method of power steering
KR980001631A (en) * 1996-06-25 1998-03-30 김영귀 Vehicle anti-rotation system and control method
KR19990034983A (en) * 1997-10-31 1999-05-15 양재신 Power steering aid

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