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KR101071563B1 - Power steering system with MDPS and EHPS' parallel - Google Patents

Power steering system with MDPS and EHPS' parallel Download PDF

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Publication number
KR101071563B1
KR101071563B1 KR1020080131452A KR20080131452A KR101071563B1 KR 101071563 B1 KR101071563 B1 KR 101071563B1 KR 1020080131452 A KR1020080131452 A KR 1020080131452A KR 20080131452 A KR20080131452 A KR 20080131452A KR 101071563 B1 KR101071563 B1 KR 101071563B1
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KR
South Korea
Prior art keywords
steering
mdps
ehps
motor
power
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KR1020080131452A
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Korean (ko)
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KR20100072906A (en
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이재문
김인상
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영신정공 주식회사
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Priority to KR1020080131452A priority Critical patent/KR101071563B1/en
Publication of KR20100072906A publication Critical patent/KR20100072906A/en
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    • 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
    • B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
    • B62D5/0409—Electric motor acting on the steering column
    • 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
    • B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
    • B62D5/0457—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such
    • B62D5/0481—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such monitoring the steering system, e.g. failures
    • B62D5/0484—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such monitoring the steering system, e.g. failures for reaction to failures, e.g. limp home
    • 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
    • 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
    • B62D5/30—Safety devices, e.g. alternate emergency power supply or transmission means to ensure steering upon failure of the primary steering means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2306/00—Other features of vehicle sub-units
    • B60Y2306/13—Failsafe arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2400/00—Special features of vehicle units
    • B60Y2400/40—Actuators for moving a controlled member
    • B60Y2400/405—Electric motors actuators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2400/00—Special features of vehicle units
    • B60Y2400/40—Actuators for moving a controlled member
    • B60Y2400/406—Hydraulic actuators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2400/00—Special features of vehicle units
    • B60Y2400/40—Actuators for moving a controlled member
    • B60Y2400/418—Power assistance, e.g. servo-motors
    • B60Y2400/4187—Servo-motors, e.g. electric or fluidic with feedback control

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

Abstract

본 발명은 MDPS와 EHPS 병행형 차량용 조향장치에 관한 것으로서, 더욱 상세하게는 MDPS와 EHPS를 병행하여 조타함으로써 상호 보완적 기능을 수행하고 긴급 조타 불능시 보조 조타력을 제공하여 안전성을 확보할 수 있는 MDPS와 EHPS 병행형 차량용 조향장치에 관한 것이다.The present invention relates to an MDPS and EHPS parallel vehicle steering apparatus, and more particularly, to perform a complementary function by steering in parallel with the MDPS and EHPS to provide safety in case of emergency steering inability to ensure safety The present invention relates to an MDPS and EHPS parallel vehicle steering system.

이를 위해, 본 발명은 메인 모터의 회전력으로 조향 파워를 어시스트 하는 MDPS; 유압펌프 구동을 통해 발생된 유압으로 조향 파워를 어시스트 하는 EHPS; 및 상기 메인 모터와 유압펌프의 구동을 제어하는 ECU를 포함하고, 주 조향장치로 MDPS를 사용하고, 보조 조향장치로 EHPS를 사용하여 모터의 긴급 조타불능시 또는 대형차량에서 부족한 조타력을 보조하는 것을 특징으로 하는 MDPS와 EHPS 병행형 차량용 조향장치를 제공한다.To this end, the present invention the MDPS to assist the steering power to the rotational force of the main motor; EHPS for assisting steering power with hydraulic pressure generated through hydraulic pump driving; And an ECU controlling the driving of the main motor and the hydraulic pump, and using the MDPS as the main steering device and the EHPS as the auxiliary steering device to assist the steering power that is insufficient in emergency steering of the motor or in a large vehicle. It provides an MDPS and EHPS parallel vehicle steering apparatus characterized in that.

MDPS, EHPS, ECU, 조향력, 모터, 펌프, 전동식 MDPS, EHPS, ECU, Steering, Motor, Pump, Electric

Description

ＭＤＰＳ와 ＥＨＰＳ 병행형 차량용 조향장치{Power steering system with MDPS and EHPS' parallel}Power steering system with MDPS and EHPS 'parallel}

본 발명은 MDPS와 EHPS 병행형 차량용 조향장치에 관한 것으로서, 더욱 상세하게는 MDPS와 EHPS를 병행하여 조타함으로써 상호 보완적 기능을 수행하고 긴급 조타 불능시 보조 조타력을 제공하여 안전성을 확보할 수 있는 MDPS와 EHPS 병행형 차량용 조향장치에 관한 것이다.The present invention relates to an MDPS and EHPS parallel vehicle steering apparatus, and more particularly, to perform a complementary function by steering in parallel with the MDPS and EHPS to provide safety in case of emergency steering inability to ensure safety The present invention relates to an MDPS and EHPS parallel vehicle steering system.

일반적으로 차량의 조타력을 발생하는 파워 스티어링 장치는 조향 휠의 조작력을 가볍고 원활하게 하면서도신속한 조향이 가능하도록 하기 위해서 유압을 이용하도록 설계되어 작동된다.In general, a power steering device that generates steering force of a vehicle is designed and operated to use hydraulic pressure in order to enable quick steering while making the steering wheel light and smooth.

이와 같은 파워 스티어링 장치는 작은 힘으로 조향 조작을 할 수 있으며, 조향 기어비의 조작력에 관계없이 선정할 수 있으며, 노면의 요철에서 오는 충격을 흡수하여 핸들에 전달되는 것을 방지할 수 있는 등의 이점이 있다.Such a power steering device can operate steering with a small force, can be selected irrespective of the steering force of the steering gear ratio, and can absorb the impact from the unevenness of the road surface and prevent it from being transmitted to the handle. have.

또한, 최근에는 차속 센서 및 조향 토크센서 등에서 감지한 차량의 운행조건 에 따라 전자제어장치(ECU)에서 모터를 구동시켜 저속 운행 시에는 가볍고 편안한 조향감을 부여하고, 고속 운행 시에는 무거운 조향감과 더불어 양호한 방향 안정성을 부여하며, 비상상황에서는 급속한 조향이 이루어지도록 하여 운전자에게 최적의 조향 조건을 제공하는 전동식 스티어링 장치를 이용하고 있는 추세이다.In addition, in recent years, the electronic control unit (ECU) drives the motor according to the driving conditions of the vehicle sensed by the vehicle speed sensor and the steering torque sensor to provide a light and comfortable steering feeling at low speed, and a heavy steering feeling at high speed. Directional stability is provided, and in an emergency situation, a trend is to use an electric steering device that provides an optimum steering condition to the driver by enabling rapid steering.

이러한 전동식 스티어링 장치는 통상 EHPS(Electro-hydraulic Power Steering)이나 또는 MDPS(Motor Driven Power Steering)가 있으며, 이중 MDPS 시스템은, 도 1에 도시한 바와 같이 펌프에서 유압을 형성하여 파워를 어시스트(assist)하는 유압시스템과 달리, 모터(11)의 회전력으로 조향 파워를 어시스트(assist)하는 구조로서, 동력을 발생하는 모터(11)와 연결된 웜축(Worm-Shaft)이 스티어링샤프트(Steering-Shaft)와 연결되어 있는 웜휠(Worm Wheel)을 회전 시켜 조향력을 어시스트(assist)하게 된다.Such an electric steering device is typically EHPS (Electro-hydraulic Power Steering) or Motor Driven Power Steering (MDPS), and the dual MDPS system, as shown in FIG. 1, assists power by forming hydraulic pressure in the pump. Unlike a hydraulic system, the steering power is assisted by the rotational force of the motor 11, and a worm shaft connected to a motor 11 generating power is connected to a steering shaft. The steering wheel is assisted by rotating the worm wheel.

그런데, 상기 MDPS는 모터에 의하여 스티어링장치를 직접 구동하므로 별도의 유압장치가 필요없는 장점을 가지고 있으나, 고중량의 대형차량에 조향 동력을 공급하기 위한 모터의 용량에 한계가 있는 단점이 있다.By the way, the MDPS directly drives the steering device by the motor has the advantage that no separate hydraulic device is required, but there is a disadvantage in that there is a limit in the capacity of the motor for supplying steering power to a large heavy vehicle.

본 발명은 상기와 같은 점을 감안하여 안출한 것으로서, 평상시에는 MDPS의 메인 모터를 이용하여 조향파워를 어시스트하고, 상기 메인 모터의 고장이 발생한 경우나 대형차량의 경우에 조타시 부족한 조향력을 제공함으로써, 상호 보완적 기능을 수행하고, 긴급 조타 불능시 보조 조타력을 제공하여 안전성을 확보할 수 있는 MDPS와 EHPS 병행형 차량용 조향장치를 제공하는데 그 목적이 있다.The present invention has been made in view of the above, by usually assisting the steering power using the main motor of the MDPS, by providing a steering power insufficient when steering in the event of a failure of the main motor or large vehicles Its purpose is to provide MDPS and EHPS parallel vehicle steering systems that can perform complementary functions and ensure safety by providing auxiliary steering power in case of emergency steering failure.

상기한 목적은 차량용 조향장치에 있어서,The above object is a vehicle steering apparatus,

메인 모터의 회전력으로 조향 파워를 어시스트 하는 MDPS; 유압펌프 구동을 통해 발생된 유압으로 조향 파워를 어시스트 하는 EHPS; 및 상기 메인 모터와 유압펌프의 구동을 제어하는 ECU를 포함하고, 주 조향장치로 MDPS를 사용하고, 보조 조향장치로 EHPS를 사용하여 모터의 긴급 조타불능시 또는 대형차량에서 부족한 조타력을 보조하는 것을 특징으로 하는 MDPS와 EHPS 병행형 차량용 조향장치에 의해 달성된다.MDPS to assist steering power with the rotational force of the main motor; EHPS for assisting steering power with hydraulic pressure generated through hydraulic pump driving; And an ECU controlling the driving of the main motor and the hydraulic pump, and using the MDPS as the main steering device and the EHPS as the auxiliary steering device to assist the steering power that is insufficient in emergency steering of the motor or in a large vehicle. It is achieved by the MDPS and EHPS parallel vehicle steering system characterized in that.

바람직하게는, 상기 MDPS는 조향파워를 어시스트 할 수 있도록 스티어링 축에 설치되는 메인 모터를 포함하고, 상기 메인 모터는 ECU로부터 제어에 따라 작동하는 것을 특징으로 한다.Preferably, the MDPS includes a main motor installed on the steering shaft to assist steering power, and the main motor is operated under control from the ECU.

또한, 상기 EHPS는 ECU의 제어에 따라 구동되는 펌프구동용 모터; 상기 펌프 구동용 모터에 의해 작동되는 유압펌프; 상기 유압펌프의 작동으로 작동유가 공급되며, 양단부가 조향차륜에 연결되는 스티어링기어박스; 및 스티어링휠의 회전방향에 따라 유압의 흐름을 전환시키도록 상기 스티어링기어박스에 설치된 유압제어밸브를 포함하는 것을 특징으로 한다.In addition, the EHPS is a pump driving motor driven under the control of the ECU; A hydraulic pump operated by the pump driving motor; A steering gear box supplied with operating oil by operation of the hydraulic pump and having both ends connected to a steering wheel; And it characterized in that it comprises a hydraulic control valve installed in the steering gear box to switch the flow of hydraulic pressure in accordance with the rotation direction of the steering wheel.

이에 따라 본 발명에 따른 MDPS와 EHPS 병행형 차량용 조향장치에 의하면, 평상시에는 MDPS의 메인 모터를 이용하여 조향파워를 어시스트하고, 상기 메인 모터의 고장이 발생한 경우나 대형차량의 경우에 조타시 부족한 조향력을 제공함으로써, 차량의 조향력을 향상시킬 수 있다.Accordingly, according to the MDPS and EHPS parallel vehicle steering apparatus according to the present invention, the steering power is usually assisted by using the MDPS main motor, and the steering power insufficient when steering the motor in the event of a failure of the main motor or a large vehicle. By providing this, the steering force of the vehicle can be improved.

또한, MDPS와 EHPS의 병행으로 쌍방간의 소형화가 가능하고, 상호 보완적 기능을 수행하고, 긴급 조타 불능시 보조 조타력을 제공한다.In addition, in parallel with the MDPS and EHPS, both can be miniaturized, perform complementary functions, and provide auxiliary steering power in case of emergency steering failure.

이하, 본 발명의 바람직한 실시예를 첨부도면을 참조로 상세하게 설명한다.Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

본 발명은 EHPS와 MDPS를 병행하여 상호 보완적 기능수행과 긴급 조타불능시 보조 조타력을 제공하는 전동식 조향장치에 관한 것이다. 또한 본 발명은 MDPS가 주 조향장치의 역할을 담당하도록 하고, EHPS는 보조 조향장치의 역할을 수행하도록 한다.The present invention relates to an electric steering apparatus which provides EHPS and MDPS in parallel to provide complementary functional performance and auxiliary steering power in case of emergency steering failure. In addition, the present invention allows the MDPS to play the role of the main steering device, EHPS to perform the role of the auxiliary steering device.

즉, 평상시에는 MDPS가 주 조향장치를 하면서, EHPS가 MDPS의 메인 모터(11) 고장시 부족한 조타력을 보조하여 핸들 조향력을 향상시키는 것이다.That is, while the MDPS is usually the main steering device, the EHPS assists the steering power that is insufficient when the MDPS main motor 11 breaks down to improve the steering steering power.

대형 차량의 경우 MDPS의 메인 모터(11)가 조향하고 조타시 부족한 조향력을 ECU(12)를 통해 EHPS에서 적정량의 유압을 공급해 줌으로써 서로 부족한 용량 및 조타력을 제공한다.In the case of a large vehicle, the main motor 11 of the MDPS is steered and provides insufficient capacity and steering power to each other by supplying a proper amount of hydraulic pressure from the EHPS through the ECU 12.

이를 통해 구현되는 것은 MDPS의 모터용량 소형화 및 EHPS의 외관 형상 축소 등 쌍방간의 소형화 추진이 가능하다.What is realized through this is miniaturization of both sides such as miniaturization of motor capacity of MDPS and reduction of external shape of EHPS.

도 2는 본 발명의 일실시예에 따른 MDPS와 EHPS 병행형 전동식 조향장치를 나타내는 구성도이다.Figure 2 is a block diagram showing an MDPS and EHPS parallel type electric steering apparatus according to an embodiment of the present invention.

MDPS(Motor Driven Power Steering) 시스템은 펌프(15)에서 유압을 형성하여 파워를 어시스트(assist)하는 유압시스템과 달리 메인 모터(11)의 회전력으로 조향 파워를 어시스트(assist)하는 구조로서, 동력을 발생하는 모터와 연결된 웜축(Worm-Shaft)이 스티어링샤프트(Steering-Shaft)와 연결되어 있는 웜휠(Worm Wheel)을 회전 시켜 조향력을 어시스트(assist)하게 된다.Motor Driven Power Steering (MDPS) is a structure that assists steering power by the rotational force of the main motor 11, unlike a hydraulic system that assists power by forming hydraulic pressure in the pump 15. Worm-Shaft connected to the generated motor rotates the Worm Wheel connected to the Steering-Shaft to assist the steering force.

여기서, MDPS에서 중요한 점은 메인 모터(11)의 회전력으로 조향 파워를 어시스트한다는 점이고, 그 외 다른 구성들은 공지된 기술을 통해 제한되지 않고 구현가능할 것이다.An important point here in MDPS is that the steering power is assisted by the rotational force of the main motor 11, and other configurations may be implemented without limitation through known techniques.

EHPS(Electro-hydraulic Power Steering)는 일반 유압식 파워 스티어링 시스템(Hydraulicl Power Steering System)과 MDPS 간의 장단점을 보완한 중간형태이다.Electro-hydraulic Power Steering (EHPS) is an intermediate form that complements the strengths and weaknesses of the conventional Hydraulicl Power Steering System (MDPS).

EHPS에서 사용되는 유압펌프(15)에는 펌프 구동을 위한 펌프구동용 모터(16) 가 장착되어 있다. 차속센서 신호를 ECU(12)에서 입력받은 후 ECU(12)의 제어에 따라 모터가 구동을 하게 되고, 모터의 구동을 통한 유압펌프(15)의 작동으로 작동유가 스티어링기어박스(18)로 보내지며, 상기 스티어링기어박스(18)에서 리턴되는 작동유는 저압 리턴 라인(17)을 통해 다시 유압펌프(15)측으로 공급되게 된다. The hydraulic pump 15 used in the EHPS is equipped with a pump driving motor 16 for driving the pump. After receiving the vehicle speed sensor signal from the ECU 12, the motor is driven under the control of the ECU 12, and the hydraulic oil is sent to the steering gear box 18 by the operation of the hydraulic pump 15 through the driving of the motor. The hydraulic oil returned from the steering gear box 18 is supplied to the hydraulic pump 15 through the low pressure return line 17 again.

상기 기어박스(18)는 스티어링휠의 회전방향에 따라 유압의 흐름을 전환시키는 유압제어밸브(13), 및 이로부터 전달되는 유압이 이동되는 실린더와, 이의 내부에서 동작되는 피스톤으로 구성된다. 따라서, 상기 스티어링기어박스(18)에 압송된 유압에 의해 기어박스(18)와 연결된 차륜(14)을 좌우로 조작하게 된다.The gear box 18 is composed of a hydraulic control valve 13 for switching the flow of hydraulic pressure in accordance with the rotation direction of the steering wheel, a cylinder to which the hydraulic pressure transmitted therefrom is moved, and a piston operated therein. Therefore, the wheel 14 connected to the gear box 18 is operated left and right by the hydraulic pressure delivered to the steering gear box 18.

여기서, 조량의 주도적 역할은 7(MDPS): 3(EHPS) 또는 6(MDPS): 4(EHPS) 등의 비율로 기능수행에 따라 배분할 수 있다.Here, the dominant role of the light may be allocated according to the function performance in a ratio of 7 (MDPS): 3 (EHPS) or 6 (MDPS): 4 (EHPS).

이와 같은 구성에 의해 평상시에는 MDPS의 메인 모터(11)를 이용하여 조향파워를 어시스트하고, 상기 메인 모터(11)의 고장이 발생한 경우나 대형차량의 경우에 조타시 부족한 조향력을 제공함으로써, 차량의 조향력을 향상시킬 수 있다.By such a configuration, steering power is assisted by using the main motor 11 of MDPS at normal times, and the steering power insufficient when steering in the case of a failure of the main motor 11 or a large vehicle is provided. Steering power can be improved.

또한, MDPS와 EHPS의 병행으로 쌍방간의 소형화가 가능하고, 상호 보완적 기능을 수행하고, 긴급 조타 불능시 보조 조타력을 제공한다.In addition, in parallel with the MDPS and EHPS, both can be miniaturized, perform complementary functions, and provide auxiliary steering power in case of emergency steering failure.

도 1은 MDPS의 구성을 나타내는 설명도,1 is an explanatory diagram showing a configuration of an MDPS;

도 2는 본 발명의 일실시예에 따른 MDPS와 EHPS 병행형 전동식 조향장치를 나타내는 구성도이다.Figure 2 is a block diagram showing an MDPS and EHPS parallel type electric steering apparatus according to an embodiment of the present invention.

<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>

10 : 스티어링 휠 11 : 메인 모터10: steering wheel 11: main motor

12 : ECU 13 : 유압제어밸브12 ECU 13 Hydraulic control valve

14 : 차륜 15 : 유압 펌프14 wheel 15 hydraulic pump

16 : 펌프구동용 모터 17 : 저압 리턴라인16: pump driving motor 17: low pressure return line

18 : 스티어링기어박스18: Steering Gear Box

Claims (3)

차량용 조향장치에 있어서,In a vehicle steering apparatus, 메인 모터의 회전력으로 조향 파워를 어시스트 하는 MDPS;MDPS to assist steering power with the rotational force of the main motor; 유압펌프 구동을 통해 발생된 유압으로 조향 파워를 어시스트 하는 EHPS; EHPS for assisting steering power with hydraulic pressure generated through hydraulic pump driving; 상기 메인 모터와 유압펌프의 구동을 제어하는 ECU;An ECU controlling the driving of the main motor and the hydraulic pump; 를 포함하며, 주 조향장치로 MDPS를 사용하고, 보조 조향장치로 EHPS를 사용하여, 모터의 긴급 조타불능시 또는 대형차량에서 부족한 조타력을 보조하되, It includes, using the MDPS as the main steering device, EHPS as the auxiliary steering device, to assist the steering power insufficient in emergency steering of the motor or in large vehicles, 상기 MDPS는 조향파워를 어시스트 할 수 있도록 스티어링 축에 설치되는 메인 모터를 포함하고, 상기 메인 모터는 ECU로부터 제어에 따라 작동하며, The MDPS includes a main motor installed on the steering shaft to assist steering power, the main motor is operated under control from the ECU, 상기 EHPS는 ECU의 제어에 따라 구동되는 펌프구동용 모터와, 상기 펌프구동용 모터에 의해 작동되는 유압펌프와, 상기 유압펌프의 작동으로 작동유가 공급되며 양단부가 조향차륜에 연결되는 스티어링기어박스와, 스티어링휠의 회전방향에 따라 유압의 흐름을 전환시키도록 상기 스티어링기어박스에 설치된 유압제어밸브를 포함하는 것을 특징으로 하는 MDPS와 EHPS 병행형 차량용 조향장치.The EHPS includes a pump driving motor driven under the control of the ECU, a hydraulic pump operated by the pump driving motor, a steering gear box supplied with hydraulic oil by the operation of the hydraulic pump, and connected at both ends to a steering wheel. And a hydraulic control valve installed in the steering gear box so as to switch the flow of hydraulic pressure in accordance with the rotational direction of the steering wheel. 삭제delete 삭제delete
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