KR20020080986A - Power steering system by using magnetorheological fluids - Google Patents

Power steering system by using magnetorheological fluids Download PDF

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Publication number
KR20020080986A
KR20020080986A KR1020010020922A KR20010020922A KR20020080986A KR 20020080986 A KR20020080986 A KR 20020080986A KR 1020010020922 A KR1020010020922 A KR 1020010020922A KR 20010020922 A KR20010020922 A KR 20010020922A KR 20020080986 A KR20020080986 A KR 20020080986A
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KR
South Korea
Prior art keywords
steering
cylinder
magneto
magnetorheological fluid
power steering
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KR1020010020922A
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Korean (ko)
Inventor
윤승국
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기아자동차주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority to KR1020010020922A priority Critical patent/KR20020080986A/en
Publication of KR20020080986A publication Critical patent/KR20020080986A/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
    • B62D6/02—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits responsive only to vehicle speed
    • 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
    • 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
    • B60Y2400/402—Manual actuators, i.e. input levers or linkages therefor
    • B60Y2400/4026—Manual actuators, i.e. input levers or linkages therefor providing feel, e.g. with feedback force

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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)
  • Fluid-Damping Devices (AREA)

Abstract

PURPOSE: A power steering system by using magneto-rheological fluid is provided to prevent the operational force of a steering wheel from being lightened in increasing speed of a vehicle during traveling. CONSTITUTION: A power steering system is composed of a cylinder(10) fitted around a steering shaft(15) to reduce movement of the steering shaft in increasing viscosity of magneto-rheological fluid by forming a magnetic field; a solenoid(9) installed at the side of the cylinder to apply the magnetic field to the magneto-rheological fluid; and a power supply circuit applying voltage to the solenoid. Load applied to the steering wheel is adjusted with regulating the viscosity of magneto-rheological fluid. Travel stability at high speed is improved by using magneto-rheological fluid.

Description

자기유변유체를 이용한 동력 조향 장치{Power steering system by using magnetorheological fluids}Power steering system by using magnetorheological fluids

본 발명은 동력 조향 장치에 관한 것으로, 더욱 상세하게는 자기유변유체를 이용하여 차량의 속도가 올라감에 따라 핸들의 조작력이 너무 가벼워지는 것을 막는 동력조향장치에 관한 것이다.The present invention relates to a power steering apparatus, and more particularly, to a power steering apparatus which prevents the operation force of the steering wheel from becoming too light as the speed of the vehicle increases by using the magnetorheological fluid.

일반적으로, 동력 조향 장치는 대형 자동차나 저압 타이어를 이용하는 차에서 앞바퀴의 접지저항이 크기 때문에 핸들의 조작력이 크게 되고 신속한 조향 조작이 안되므로, 가볍고 신속한 조향 조작을 하기 위해 차량에 적용되는 장치이다.In general, a power steering device is a device applied to a vehicle for light and quick steering operation because the steering wheel of the front wheel is large because the ground resistance of the front wheel is large in a large vehicle or a vehicle using low-pressure tires, and the steering force is not fast.

도 1에 도시된 바와 같이, 종래의 동력 조향 장치는 도 1에 도시된 바와 같이, 엔진의 전면에 장착되어 드라이브 벨트를 통해 크랭크 샤프트에 의해 구동되는 오일 펌프(1)와, 오일 저장탱크(2)와, 동력 실린더와 오일의 압력과 유량을 제어하는 밸브유닛을 포함하는 조향기어박스(3)로 구성되며, 오일 저장탱크(2)로부터 오일 펌프(1)로 유입된 오일은 오일펌프(1) 내에서 압축되고, 그 압축된 오일은 조향기어박스(3)내의 동력 실린더로 이송되면, 동력 실린더가 작동하여 핸들(4)의 조작력을 가볍게 한다. 이때, 이송된 오일의 압력은 밸브유닛에 의해 감지되고 조정된다.As shown in FIG. 1, a conventional power steering apparatus is shown in FIG. 1, which includes an oil pump 1 and an oil storage tank 2 mounted on the front of the engine and driven by a crankshaft through a drive belt. And a steering gear box 3 including a power cylinder and a valve unit for controlling the pressure and flow rate of the oil, and the oil introduced from the oil storage tank 2 to the oil pump 1 is an oil pump 1. ), The compressed oil is transferred to the power cylinder in the steering gear box (3), the power cylinder is operated to lighten the operating force of the handle (4). At this time, the pressure of the transferred oil is sensed and adjusted by the valve unit.

이러한 종래의 동력 조향 장치는 운전자에게 조향시 가볍고 신속한 조향 조작을 용이하게 하는 편리함이 있지만, 차량의 속도가 올라감에 따라 조향 조작력이 너무 가벼워져 사고의 위험이 있는 단점이 있었다.Such a conventional power steering device has the convenience of light and quick steering operation for the driver when steering, but the steering operation force is too light as the speed of the vehicle increases, there is a risk of an accident.

본 발명은, 상기와 같은 점을 감안하여, 자기유변유체를 이용하여 차량의 속도가 올라감에 따라 핸들의 조작력이 너무 가벼워지지 않도록 조절하는 동력조향장치를 제공하는 데 그 목적이 있다.SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to provide a power steering apparatus for adjusting the steering force of the steering wheel so that it is not too light as the speed of the vehicle increases by using the magnetorheological fluid.

도 1은 종래의 동력 조향 장치를 도시한 사시도.1 is a perspective view showing a conventional power steering device.

도 2는 본 발명의 동력 조향 장치를 도시한 사시도.2 is a perspective view of the power steering apparatus of the present invention.

도 3은 본 발명의 자기유변유체가 담긴 실린더의 단면도.Figure 3 is a cross-sectional view of the cylinder containing the magnetorheological fluid of the present invention.

도 4는 본 발명의 동력 조향 장치의 전원공급부를 도시한 회로도이다.4 is a circuit diagram showing a power supply unit of the power steering apparatus of the present invention.

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

9 : 솔레노이드10 : 실린더9: solenoid 10: cylinder

15 : 조향축20 : 자기유변유체15: steering shaft 20: magnetorheological fluid

상기의 목적을 달성하기 위하여 본 발명에 따른 자기유변유체를 이용한 동력조향장치는, 가볍고 신속한 핸들의 조향 조작을 위한 동력 조향 장치에 있어서, 자기유변유체가 내장되어 자기유변유체가 인가된 자기장에 의해 점성이 증가하게 되면 조향축의 움직임을 둔화시키도록 조향축의 축선방향의 외주부에 삽입되는 실린더; 실린더 내의 자기유변유체에 자기장이 걸리도록 실린더의 일측에 장착되는 전자석; 전자석에 전압을 인가하는 전원공급회로를 포함한다.In order to achieve the above object, the power steering apparatus using the magnetorheological fluid according to the present invention is a power steering device for steering light and quick steering of a steering wheel. A cylinder inserted into an outer peripheral portion of the steering shaft in an axial direction to slow the movement of the steering shaft when the viscosity increases; An electromagnet mounted on one side of the cylinder such that a magnetic field is applied to the magnetorheological fluid in the cylinder; It includes a power supply circuit for applying a voltage to the electromagnet.

이하, 첨부된 도면을 참조하여 본 발명의 바람직한 실시예를 상세히 설명한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 2에 도시된 바와 같이, 본 발명에 따른 자기유변유체를 이용한 동력 조향 장치는 조향축(15)의 소정부위에 자기유변유체를 내장한 실린더(10)와, 실린더(10)의 양단에 부착된 솔레노이드(9)와, 솔레노이드(9)에 가변 전압을 인가하는 전원 공급 회로(도 4 참조)를 포함한다.As shown in FIG. 2, the power steering apparatus using the magnetorheological fluid according to the present invention is attached to a cylinder 10 having a magnetorheological fluid embedded in a predetermined portion of the steering shaft 15 and to both ends of the cylinder 10. A solenoid 9 and a power supply circuit (see FIG. 4) for applying a variable voltage to the solenoid 9.

먼저, 자기유변유체는 유체 양단에 자기장을 인가하게 되면 유체의 분자들이 일렬로 배치되면서 유체의 점성을 극단적으로 증가시키는 성질이 있는 유체이다.First, a magnetorheological fluid is a fluid having a property of dramatically increasing the viscosity of a fluid when molecules of the fluid are arranged in a line when a magnetic field is applied to both ends of the fluid.

이러한 자기유변유체(20)를 내장한 실린더(10)는 도 3에 도시된 바와 같이, 그 내부에 자기유변유체(20)가 내장되고 저속시에는 조향축(15)의 조작에 간섭을 주지 않도록 조향축(15)에 독립적으로 삽입되어 장착되고, 자기유변유체(20)에 자기장이 걸리면 점성이 증가하여 자기유변유체(20)가 고체 상태로 되어 조향축(15)의 조작력을 둔화시킨다.As shown in FIG. 3, the cylinder 10 including the magnetorheological fluid 20 has a magnetorheological fluid 20 embedded therein so as not to interfere with manipulation of the steering shaft 15 at a low speed. Independently inserted and mounted on the steering shaft 15, when the magnetic field is applied to the magnetorheological fluid 20, the viscosity increases, and the magnetorheological fluid 20 becomes a solid state, thereby slowing the operation force of the steering shaft 15.

솔레노이드(9)는 실린더(10)내의 자기유변유체에 자기장이 인가되도록 전원공급회로에 연결되어 실린더(10)의 양단에 장착된다.The solenoid 9 is connected to a power supply circuit so that a magnetic field is applied to the magnetorheological fluid in the cylinder 10 and mounted at both ends of the cylinder 10.

솔레노이드(9)에 전압을 인가하는 전원 공급 회로는 도 4에 도시된 바와 같이, 차량의 배터리(Vcc)에 고정저항(RFIXED)과 회전식 가변 저항(RVAR)이 직렬로 연결되고, 회전식 가변 저항(RVAR)의 양단 전압이 솔레노이드(9)에 인가된다. 회전식 가변 저항(RVAR)은 속도계의 바늘쪽에 장착되어 차량의 속도가 증가함에 따라 속도계의 바늘이 점점 많이 회전할수록 저항값이 증가하여 다음의 식과 같이 솔레노이드(9)에 인가되는 전압(Vsolenoid)이 증가한다.As shown in FIG. 4, in the power supply circuit for applying a voltage to the solenoid 9, a fixed resistor R FIXED and a rotary variable resistor R VAR are connected in series to a battery Vcc of the vehicle, and a rotary variable is provided. The voltage across the resistor R VAR is applied to the solenoid 9. The rotary variable resistor R VAR is mounted on the needle side of the speedometer, and as the speed of the vehicle increases, the resistance value increases as the needle of the speedometer increases more and more, and the voltage applied to the solenoid 9 (V solenoid ) as shown in This increases.

따라서, 솔레노이드(9)에 인가되는 전압이 커지면 자기유변유체 내에 걸리는 자기장의 세기가 커져 자기유변유체의 점성을 증가되어 핸들에 걸리는 힘을 조절할 수 있다.Therefore, when the voltage applied to the solenoid 9 is increased, the strength of the magnetic field applied to the magnetorheological fluid is increased, thereby increasing the viscosity of the magnetorheological fluid and thus controlling the force applied to the handle.

상기된 바와 같은 본 발명은 자기유변유체를 이용하여 고속 주행시의 안정성이 보장하도록 차량의 속도가 올라감에 따라 핸들의 조작력이 너무 가벼워지는 것을 막아 사고의 위험을 방지하는 매우 뛰어난 효과가 있다.The present invention as described above has a very excellent effect of preventing the risk of accidents by preventing the operation force of the handle is too light as the speed of the vehicle increases to ensure the stability at high speed using the magnetorheological fluid.

이상에서는, 본 발명을 특정의 바람직한 실시예에 대해서 도시하고 설명하였다. 그러나, 본 발명은 상술한 실시예에만 한정되는 것은 아니며 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자라면 이하의 특허청구범위에 기재된 본 발명의 기술적 사상의 요지를 벗어남이 없이 얼마든지 다양하게 변경실시할 수 있을 것이다.In the above, the present invention has been illustrated and described with respect to certain preferred embodiments. However, the present invention is not limited only to the above-described embodiments, and those skilled in the art to which the present invention pertains can vary as many without departing from the spirit of the technical idea of the present invention described in the claims below. Modifications may be made.

Claims (1)

가볍고 신속한 핸들의 조향 조작을 위한 동력 조향 장치에 있어서,In the power steering for light and fast steering operation, 자기유변유체가 내장되어, 상기 자기유변유체가 인가된 자기장에 의해 점성이 증가하게 되면 조향축의 움직임을 둔화시키도록 조향축의 축선방향의 외주부에 삽입되는 실린더;A cylinder in which a magnetorheological fluid is embedded and inserted into an outer circumferential portion of the steering shaft so as to slow the movement of the steering shaft when the magnetorheological fluid is increased in viscosity by a magnetic field to which the magnetorheological fluid is applied; 상기 실린더 내의 자기유변유체에 자기장이 걸리도록 상기 실린더의 일측에 장착되는 전자석;An electromagnet mounted on one side of the cylinder such that a magnetic field is applied to the magnetorheological fluid in the cylinder; 상기 전자석에 전압을 인가하는 전원공급회로를 포함하는 자기유변유체를 이용한 동력조향장치.Power steering apparatus using a magnetorheological fluid comprising a power supply circuit for applying a voltage to the electromagnet.
KR1020010020922A 2001-04-18 2001-04-18 Power steering system by using magnetorheological fluids KR20020080986A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5358084A (en) * 1993-01-19 1994-10-25 Chrysler Corporation Torque magnitude control using electrorheological fluids
KR19980028993A (en) * 1996-10-25 1998-07-15 박병재 Automotive Electronic Power Steering
US5845753A (en) * 1996-07-18 1998-12-08 New Venture Gear, Inc. Torque transfer apparatus using magnetorheological fluids
KR19990020657A (en) * 1997-08-30 1999-03-25 정몽규 Speed Sensitive Power Steering System Using Electromagnets
KR20020052706A (en) * 2000-12-26 2002-07-04 밍 루 Steering power controller using magneto-rheological fluid in a power steering system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5358084A (en) * 1993-01-19 1994-10-25 Chrysler Corporation Torque magnitude control using electrorheological fluids
US5845753A (en) * 1996-07-18 1998-12-08 New Venture Gear, Inc. Torque transfer apparatus using magnetorheological fluids
KR19980028993A (en) * 1996-10-25 1998-07-15 박병재 Automotive Electronic Power Steering
KR19990020657A (en) * 1997-08-30 1999-03-25 정몽규 Speed Sensitive Power Steering System Using Electromagnets
KR20020052706A (en) * 2000-12-26 2002-07-04 밍 루 Steering power controller using magneto-rheological fluid in a power steering system

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