KR19990015170A - Automotive Steering Force Control System - Google Patents

Automotive Steering Force Control System Download PDF

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Publication number
KR19990015170A
KR19990015170A KR1019970037082A KR19970037082A KR19990015170A KR 19990015170 A KR19990015170 A KR 19990015170A KR 1019970037082 A KR1019970037082 A KR 1019970037082A KR 19970037082 A KR19970037082 A KR 19970037082A KR 19990015170 A KR19990015170 A KR 19990015170A
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South Korea
Prior art keywords
pressure
steering
hydraulic chamber
hydraulic
pump
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KR1019970037082A
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Korean (ko)
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KR100475902B1 (en
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조우근
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정몽규
현대자동차 주식회사
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Priority to KR1019970037082A priority Critical patent/KR100475902B1/en
Publication of KR19990015170A publication Critical patent/KR19990015170A/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
    • B62D5/06—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
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2540/00—Input parameters relating to occupants
    • B60W2540/18—Steering angle
    • 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
    • B60Y2400/30—Sensors
    • B60Y2400/303—Speed sensors
    • 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
    • B60Y2400/30—Sensors
    • B60Y2400/306—Pressure sensors
    • 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

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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

본 발명은 자동차의 조향제어장치에 관한 것으로서 특히 차속에 감응하는 자동차용 조향력제어시스템에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steering control apparatus for a vehicle, and more particularly to a steering force control system for a vehicle sensitive to vehicle speed.

본 발명은 조향핸들과,조향컬럼과,조향기어박스와,타이로드를 포함하는 자동차의 조향제어장치에 있어서;조향컬럼주위에 설치된 유압실과;유압실내측 조향컬럼의 주위에 설치된 조향력제어용 패드와;상기의 유압실의 유압을 증가시키도록하는 가압펌프와;상기의 유압실의 유압을 감소시키는 감압펌프와;상기 유압실의 압력을 검출하는 유압검출센서와;차속센서와;상기 가압펌프의 회전을 제어하기위한 PWM제어기와;상기 차속센서의 검출결과와 유압검출센서의 결과를 사전 설정된 값과 비교하여 고속일수록 유압실의 압력이 증가하도록 상기의 감압펌프,감압밸브 및 PWM제어기를 제어하는 전자제어장치를 포함하는 것을 특징으로 하는 자동차용 조향력제어시스템을 제공한다.According to an aspect of the present invention, there is provided a steering control apparatus for a vehicle including a steering wheel, a steering column, a steering gear box, and a tie rod; a hydraulic chamber disposed around a steering column; a steering force control pad installed around a steering column inside a hydraulic chamber; A pressure pump for increasing the hydraulic pressure of the hydraulic chamber; a pressure reducing pump for reducing the hydraulic pressure of the hydraulic chamber; a hydraulic pressure detection sensor for detecting a pressure in the hydraulic chamber; a vehicle speed sensor; and the pressure pump A PWM controller for controlling the rotation; comparing the detection result of the vehicle speed sensor and the result of the hydraulic detection sensor with a preset value to control the decompression pump, the pressure reducing valve and the PWM controller so that the pressure in the hydraulic chamber increases at a higher speed. It provides an automotive steering force control system comprising an electronic control device.

Description

자동차용 조향력제어시스템Automotive Steering Force Control System

본 발명은 자동차의 조향제어장치에 관한 것으로서 특히 차속에 감응하는 자동차용 조향력제어시스템에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steering control apparatus for a vehicle, and more particularly to a steering force control system for a vehicle sensitive to vehicle speed.

본 발명은 자동차의 조향컬럼 주위에 유압실과 조향력제어용 패드를 설치하여 차속이 증가할수록 조향핸들의 조작력을 감소시키도록하며 동시에 조향휠의 급조향시,또는 후진시에도 적절한 조작력을 지니도록하여 차량의 편의성과 함께 안정성을 향상시키기 위한 것이다.The present invention is to install the hydraulic chamber and the steering force control pad around the steering column of the vehicle to reduce the steering force of the steering wheel as the vehicle speed increases, and at the same time to have a proper steering force in the case of sudden steering or reversing of the steering wheel. To improve the stability with convenience.

종래의 자동차는 특히,대형차의 경우 또는 타이어 공기압이 저압상태인경우는 전륜의 접지저항이 증가하기 때문에 조향휠의 조작력이 약화되어 신속한 조향조작을 할 수 없고 ,또한 승용차의 전륜구동경향,타이어의 광폭화추세에 따라 차량의 주행 또는 정지중에 핸들조작의 신속화 경량화가 요구되므로 이를 해결하기 위한 수단으로 동력조향장치가 제공되고 있다.In the case of a conventional car, especially in a large vehicle or when the tire pressure is low, the ground resistance of the front wheel increases, so that the steering force of the steering wheel is weakened, so that it is not possible to perform a quick steering operation. In accordance with the widening trend, the steering wheel operation is required to reduce the speed and weight of the steering wheel during driving or stopping of the vehicle. Thus, a power steering apparatus is provided as a means to solve the problem.

종래의 자동차의 동력조향장치는 조향장치의 도중에 배력장치를 설치하여 조향휠 의 조작력을 배력작용에의해 경감시키는 것으로,엔진의 구동에따라 구동되는 오일펌프에의해 유압을 발생시켜 이 유압을 동력으로하여 운전자의 조작력을 배력하도록 한다.Conventional automobile power steering system installs a booster in the middle of the steering system to reduce the operating force of the steering wheel by the back force action. The oil pressure is generated by an oil pump driven by the engine to generate the hydraulic pressure. To increase the operating power of the driver.

한편,통상 조향장치는 차량의 속력이 빨라질수록 조향력이 가벼워지지만,속도에 무관하게 배력의 크기가 일정한 동력조향장치의 경우 고속으로 될수록 휠이 가벼워 사고의 위험이 있으므로 이를 방지하기위해 차속에따라 조향력을 변화시키는 전자제어식 동력조향장치가 제공되고 있다.On the other hand, in general, steering is lighter as the speed of the vehicle becomes faster, but in the case of a power steering device with a constant magnitude of power regardless of the speed, the wheel is lighter as the speed is higher, so there is a risk of an accident. There is provided an electronically controlled power steering apparatus for changing the pressure.

이러한 종래의 동력조향장치의 제어시스템에 따르면,제 1 도에 도시되어 있는 바와 같은 구성으로 이루어지며,엔진의 구동에 따라 구동되는 오일 펌프(6), 오일 펌프(6)에 오일을 공급하는 오일 탱크(5),조향휠이 회전될 때 힘을 전달하는 조향 샤프트(1), 오일 펌프(6)로부터 오일이 공급되고 조향 샤프트를 통해 회전력이 인가되면 그 힘에 따라 유압을 절환하는 컨트롤 밸브부(2), 컨트롤밸브부(2)를 통과한 오일이 공급되어 조향휠의 회전력을 상기 오일의 압력에 따라 배력하여 타이로드에 전달하는 조향기어박스(4),오일통로의 유량을 제어하여 컨트롤 박스의 유압을 조정하는 유량제어밸브,차속검출센서,상기센서로부터의 검지값에따라 유량제어밸브를 제어하는 전자제어장치로 구성된다.According to the control system of such a conventional power steering device, the configuration as shown in Figure 1, the oil pump 6, the oil for supplying oil to the oil pump 6 is driven in accordance with the drive of the engine Tank 5, steering shaft 1 which transmits force when the steering wheel is rotated, control valve part for switching hydraulic pressure according to the force when oil is supplied from the oil pump 6 and rotational force is applied through the steering shaft (2), the oil is passed through the control valve unit (2) is supplied to the steering gear box (4), which transfers the rotational force of the steering wheel according to the pressure of the oil to the tie rod, and controls the flow rate of the oil passage And a flow rate control valve for adjusting the hydraulic pressure of the box, a vehicle speed detection sensor, and an electronic control device for controlling the flow rate control valve in accordance with the detection value from the sensor.

전술한 바와 같은 종래의 자동차의 동력조향장치의 작용은 다음과 같다. 먼저,자동차의 운전자가 자동차의 시동을 건 상태에서 자동차의 조향휠을 회전시키면,핸들의 회전력이 조향 샤프트(1)를 통해 컨트롤 밸브부(2)에 전달된다.그리고 엔진이 구동될 때 회전하는 오일 펌프(6)는 오일 탱크(5)에서 공급되는 오일을 오일 통로를 통해 컨트롤 밸브부(2)에 공급한다.The operation of the power steering apparatus of the conventional vehicle as described above is as follows. First, when the driver of the vehicle rotates the steering wheel of the vehicle while the vehicle is started, the rotational force of the handle is transmitted to the control valve unit 2 through the steering shaft 1 and rotates when the engine is driven. The oil pump 6 supplies the oil supplied from the oil tank 5 to the control valve part 2 through the oil passage.

이때,컨트롤 밸브부(2)내의 토션바는 반작용력에 해당하는 만큼 비틀림 응력을 받게되어 약간 비틀리게 된다. 이 토션바의 비틀림 작용과 컨트롤 밸브부를 통해 공급되는 오일의 작용에의해 조향기어박스(4)내의 조향기어(3)가 작동하게되어 조향휠의 조향력을 배력하여 타이로드(7)를 통해 차륜으로 전달하게된다At this time, the torsion bar in the control valve portion 2 is subjected to a torsional stress corresponding to the reaction force is slightly twisted. By the torsion of the torsion bar and the action of the oil supplied through the control valve part, the steering gear 3 in the steering gear box 4 is operated to boost the steering force of the steering wheel to the wheel through the tie rod 7. Will pass

한편,전술한 동력조향장치의 제어를 위한 전자제어장치(도시되지않음)는 차속검출센서로부터의 검출값이 클수록 차속이 빠르고,작을수록 차속이 느릴 것으로 추정하고,고속일수록 조향휠을 무겁게 하려는 목적으로 유량제어밸브(도시되지 않음)의 유량을 제어한다.On the other hand, the electronic control device (not shown) for controlling the above-described power steering device assumes that the vehicle speed is faster as the detection value from the vehicle speed detection sensor is larger, and that the vehicle speed is slower as the speed is smaller, and the steering wheel is heavier at higher speeds. To control the flow rate of the flow control valve (not shown).

즉,엔진RPM이 작으므로 차량이 저속주행중,또는 정차중이라고 판단되면 유량제어밸브를 닫아 오일펌프로부터의 압력 대부분이 컨트롤밸브부(2)의 파워실린더로 입력되어 작동압을 증가시켜 조향력이 크도록 하는 반면,엔진RPM이 크므로 차량이 고속으로 주행중이라 판단되면 유량제어밸브를 열어 오일펌프로 부터 컨트롤 밸브부(2)로 입력되는 고압의 일부를 우회시켜 컨트롤밸브부의 파워실린더(도시되지않음)에 작용하는 유압을 낮추어 조향휠의 조작력을 줄이도록하여 조향휠을 상대적으로 무겁게 한다.That is, if the engine RPM is small, and the vehicle is determined to be driving at low speed or stopped, the flow control valve is closed so that most of the pressure from the oil pump is input to the power cylinder of the control valve part 2 to increase the operating pressure so that the steering force is large. On the other hand, if the engine RPM is large, and the vehicle is running at high speed, the flow control valve is opened to bypass a part of the high pressure input from the oil pump to the control valve unit 2, thereby controlling the power cylinder of the control valve unit (not shown). The steering wheel is relatively heavy by reducing the hydraulic pressure acting on the steering wheel to reduce the operating force of the steering wheel.

이러한 제어의 결과,조향휠의 조작력을 배력하여 조향휠을 조작하기 쉽도록 하며,동시에 고속에서는 배력작용을 저하시켜 조향감응도를 줄이도록 하고있다.As a result of this control, the steering wheel is easily operated by boosting the steering force of the steering wheel, and at the same time, the steering force is reduced by reducing the hydraulic power at high speed.

그러나 전술한 자동차용 동력조향장치는 유압을 이용하여 조향력을 배력하는 것으로 필수적으로 복잡한 유압제어회로를 동반하게 되므로 원가도 상승하고 ,또한 차속변화에 따른 응답이 느리다는 단점이 있다.However, the above-described power steering device for automobiles uses hydraulic pressure to back up the steering force, which is accompanied by a complicated hydraulic control circuit, which increases costs and slows response due to changes in vehicle speed.

따라서 새로운 방법으로 간단한 구성이면서도 응답이 빠른 방법을 도입할 필요가 있다.Therefore, it is necessary to introduce a simple configuration and a fast response method as a new method.

본 발명은 전술한 종래의 전자제어식 동력조향장치가 지니는 단점을 극복하기위한 것으로 조향컬럼을 잡아주는 패드를 설치하고,이 때의 악력을 유압실의 유압을 제어하는 형식으로 제어하도록하여 간단한 구성이면서도 차속및 조향휠센서의 측정값에 따른 응답성을 높인 자동차용 동력조향장치를 제공하는 것을 기술적 과제로 한다.The present invention is to overcome the shortcomings of the conventional electronically controlled power steering device described above to install a pad to hold the steering column, and to control the grip force in this case in the form of controlling the hydraulic pressure of the hydraulic chamber, It is a technical object of the present invention to provide a power steering apparatus for automobiles having improved responsiveness according to measured values of vehicle speed and steering wheel sensors.

도 1은 종래의 동력조향장치의 구성을 도시한 도면1 is a view showing the configuration of a conventional power steering device

도 2는 본 발명에 따른 조향력제어시스템의 개략적 구성을 보여주는 도면2 is a view showing a schematic configuration of a steering force control system according to the present invention;

도면의주요부분에대한부호의설명Explanation of symbols on the main parts of the drawing

8:가압펌프 9:감압펌프8: Pressure pump 9: Pressure reduction pump

10:오일탱크 11:제어부10: oil tank 11: control unit

21:조향컬럼 22:유압실21: steering column 22: hydraulic chamber

23,23':조향력제어용 패드 24,24'유압검출센서23,23 ': Paper force control pad 24,24' hydraulic detection sensor

25,25':오일공급구 26,26':오일회수구25,25 ': Oil supply port 26,26': Oil recovery port

27,27':감압밸브27,27 ': Reducing Valve

본 발명은 전술한 기술적 과제를 해결하기위한 수단으로 조향핸들과,조향컬럼과,조향기어박스와,타이로드를 포함하는 자동차의 조향제어장치에 있어서;The present invention provides a steering control apparatus for a vehicle including a steering wheel, a steering column, a steering gear box, and a tie rod as a means for solving the above technical problem;

조향컬럼주위에 설치된 유압실과;유압실내측 조향컬럼의 주위에 설치된 조향력제어용 패드와;상기의 유압실의 유압을 증가시키도록하는 가압펌프와;상기의 유압실의 유압을 감소시키는 감압펌프와;상기 유압실의 압력을 검출하는 유압검출센서와;차속센서와;상기 가압펌프의 회전을 제어하기위한 PWM제어기와;상기 차속센서의 검출결과와 유압검출센서의 결과를 사전 설정된 값과 비교하여 고속일수록 유압실의 압력이 증가하도록 상기의 감압펌프,감압밸브 및 PWM제어기를 제어하는 전자제어장치를 포함하는 것을 특징으로 하는 자동차용 조향력제어시스템을 제공한다.A hydraulic chamber installed around a steering column; a steering force control pad disposed around a steering column inside the hydraulic chamber; a pressure pump for increasing the hydraulic pressure of the hydraulic chamber; a pressure reducing pump for reducing the hydraulic pressure of the hydraulic chamber; A hydraulic pressure sensor for detecting pressure in the hydraulic chamber; a vehicle speed sensor; and a PWM controller for controlling the rotation of the pressurized pump; a detection speed of the vehicle speed sensor and a result of the hydraulic pressure detection sensor are compared with a preset value for high speed; It provides an automotive steering force control system comprising an electronic control device for controlling the pressure reducing pump, the pressure reducing valve and the PWM controller so that the pressure in the hydraulic chamber increases.

바람직하기로는 본 발명에 따른 자동차용 조향제어시스템은 조향휠센서를 추가로 포함하고,상기의 전자제어장치는 조향휠의 급조향시,유압실의 압력을 감압시키도록 감압밸브,감압펌프 및 PWM제어기를 제어하는 전자제어장치인 것으로한다.Preferably, the steering control system for a vehicle according to the present invention further includes a steering wheel sensor, wherein the electronic control device includes a pressure reducing valve, a pressure reducing pump, and a PWM so as to reduce the pressure in the hydraulic chamber during the rapid steering of the steering wheel. It is assumed to be an electronic control device for controlling the controller.

더욱 바람직하기로 본 발명에 따른 자동차용 조향제어시스템은 후진스위치를 추가로 포함하고 상기의 전자제어장치는 변속기가 후진체결상태일 때,동일속력의 전진시보다 상기 유압실의 압력을 증가시키도록 감압밸브,감압펌프 및 PWM제어기를 제어하는 전자제어장치인 것으로 한다.More preferably, the steering control system for a vehicle according to the present invention further includes a reverse switch, and the electronic control device is such that when the transmission is in the reverse fastening state, the pressure in the hydraulic chamber is increased rather than when the same speed is advanced. It is assumed to be an electronic control device for controlling the pressure reducing valve, the pressure reducing pump and the PWM controller.

또한 바람직기로 본 발명에 따른 자동차용 조향제어시스템은 상기의 전자제어장치에 현재의 차량상태에 따른 유압실의 압력정도를 사전에 설정하고 이를 현재의 값과 비교하여 감압밸브,감압펌프 및 가압펌프를 제어하도록 한다.In addition, the steering control system for automobiles according to the present invention preferably sets the pressure level of the hydraulic chamber according to the current vehicle state in advance in the electronic control apparatus and compares it with the current value to reduce the pressure reducing valve, the pressure reducing pump and the pressure pump. To control.

이하 본 발명에 따른 자동차용 조향제어시스템의 구조 및 작동상태를 도시된 도면을 참조하여 설명하도록 한다.Hereinafter, a structure and an operating state of a vehicle steering control system according to the present invention will be described with reference to the drawings.

본 발명에 따른 조향력제어시스템의 제어입력부는 도 2에 도시한 바와 같으며 드로틀위치 검출센서(13),차속센서(14),조향휠센서(15),변속기 후진스위치(16) 및 유압실의 압력스위치(24)(24')를 포함하도록한다.The control input part of the steering force control system according to the present invention is shown in FIG. 2 and includes a throttle position detecting sensor 13, a vehicle speed sensor 14, a steering wheel sensor 15, a transmission reverse switch 16 and a hydraulic chamber. And pressure switches 24 and 24 '.

드로틀위치 검출센서와 차속센서는 속도에 감응하여 조향휠의 감도를 조정하기위한 수단이며,조향휠 센서는 고속시라도 급조향시에는 조향휠의 응답성을 높이기 위한 수단으로 회전각가속도를 측정하는 방법으로 급조향 여부를 판단한다.The throttle position sensor and the vehicle speed sensor are means for adjusting the sensitivity of the steering wheel in response to the speed, and the steering wheel sensor is a means for increasing the responsiveness of the steering wheel during rapid steering even at high speeds. Determine if there is a sudden steering.

또한 변속기 후진스위치(16)는 후진변속시에는 차량의 전진시보다도 조향휠의 응답성을 낮추기 위한 수단이다.In addition, the transmission reverse switch 16 is a means for lowering the response of the steering wheel at the time of reverse shift than at the time of forward movement of the vehicle.

압력실의 압력을 검출하는 것은 차량의 조향유압실의 압력상태가 사전설정된 수준인지 등을 판단하기 위한 수단이다.Detecting the pressure in the pressure chamber is a means for determining whether the pressure state of the steering hydraulic chamber of the vehicle is at a predetermined level or the like.

본 발명에 따른 자동차용 조향력제어시스템의 제어구동부는 도2의 오른쪽에 도시한 바와 같은 구성으로 이루어지며,조향컬럼(2)의 외주에 설치된 유압실(22)과,조향컬럼을 압착하는 용도의 조향력제어용 패드(23)(23')를 주요요소로하는 조향력제어기구를 구동하는 장치인 가압펌프(8)와,감압펌프(9) 및 감압밸브를 포함하도록 구성된다.The control drive unit of the steering control system for automobiles according to the present invention has a configuration as shown on the right side of Figure 2, the hydraulic chamber 22 installed on the outer periphery of the steering column (2), the purpose of pressing the steering column It is configured to include a pressure pump 8, a pressure reducing pump 9, and a pressure reducing valve, which are devices for driving a steering force control mechanism having the steering force control pads 23, 23 'as main elements.

조향력을 제어하는 기구는 조향컬럼(2)을 압착하여 조향핸들의 조작력을 감쇠시키는 방법으로 구성되며 조향컬럼의 외주에 조향력제어용 패드(3)(3')를 설치하고 이를 유압실(22)의 압력을 조절하여 제어하도록 한다.The mechanism for controlling the steering force consists of a method of compressing the steering column 2 to attenuate the steering force of the steering wheel. The steering force control pads 3 and 3 'are installed on the outer circumference of the steering column and the hydraulic pressure chamber 22 Control by adjusting the pressure.

유압실의 압력을 증가시키는 제어수단은 가압펌프(8)이며 제어부의 제어에 따라 오일탱크(10)의 작동유를 상기의 유압실(22)로 강제 주입하여 조향력제어용 패드(3)(3')가 조향컬럼에 압착되도록 한다.The control means for increasing the pressure in the hydraulic chamber is a pressurized pump (8) and the hydraulic oil of the oil tank (10) under the control of the control unit by forcibly injecting hydraulic oil into the hydraulic chamber (22) for the steering force control pad (3) (3 ') To be pressed onto the steering column.

유압실의 압력을 감소시키는 수단은 감압밸브(27)(27')과,감압펌프(9)로서 일반적으로 감압밸브만으로도 압력감소의 효과가 있으나,응답성을 높이도록하기 위하여 감압펌프를 사용하여 오일탱크로 회수함으로서 강제 감압하도록 한다.Means for reducing the pressure in the hydraulic chamber are the pressure reducing valves 27 and 27 'and the pressure reducing pump 9, but the pressure reducing valve is generally effective to reduce the pressure. Forced pressure reduction by returning to the oil tank.

유압실의 감압이 이루어지면 조향컬럼을 압착하던 조향력제어용 패드가 조향컬럼으로부터 분리되어 조향 휠의 조작력은 상대적으로 증대된다.When the pressure is reduced in the hydraulic chamber, the steering force control pad, which pressed the steering column, is separated from the steering column, and the operating force of the steering wheel is relatively increased.

제어기구인 유압실에는 전술한 목적에 맞게 두 개의 오일회수구(27)(27')와 두 개의 오일공급구(25)(25')가 마련되어 유압실과 오일 탱크간의 통로 역할을 하도록 하였다.In the hydraulic chamber which is a control mechanism, two oil return holes 27 and 27 'and two oil supply ports 25 and 25' are provided to serve as a passage between the hydraulic chamber and the oil tank.

그러나 오일공급구및 오일 회수구의 개수는 중요하지 않으며,다만 유압 조향력제어용 패드가 조향컬럼을 전 방향에서 균일한 마찰력으로 잡아줄 수 있도록 대칭 배치하도록 한다.However, the number of the oil supply port and the oil return port is not important, but the hydraulic steering force control pad should be symmetrically arranged so that the steering column can hold the steering column with uniform friction in all directions.

한편 본 발명에 따른 조향력제어시스템의 제어부는 상기한 제어입력부의 검출 결과를 기초로 적정한 제어량을 결정하고 상기의 제어구동부를 제어하는 역할을 하는 것으로서,사전에 정보가 입력된 설정부,비교부,처리부 등을 구비하는 전자제어장치(12)와 전자제어장치의 제어신호에 따라 가압펌프의 힘을 조절하는 PWM제어기(17)를 포함하도록 구성된다.Meanwhile, the control unit of the steering force control system according to the present invention determines the appropriate control amount based on the detection result of the control input unit and controls the control drive unit. And a PWM controller 17 for adjusting the force of the pressure pump in accordance with a control signal of the electronic control apparatus including a processing unit and the like.

전자제어장치는 전술한 제어입력부인 각종의 센서의 입력을 사전에 설정된 비교기준과 비교하여 제어조건을 판단한다.The electronic control apparatus determines the control condition by comparing the inputs of the various sensors as the control input unit described above with preset comparison criteria.

제어를 위한 기준은 첫째로 차속에 따른 것으로 차속에 비례하여 상기의 유압실압력을 높이기위하여 가압펌프의 힘을 강하게 하며,반면 차속이 느려지면 가압펌프는 정지시키고 감압밸브를 열고 동시에 감압펌프를 구동하여 감암을 위한 응답을 높이는 것이다.The control criteria are based on the vehicle speed first, and the pressure of the pressure pump is increased to increase the pressure of the hydraulic chamber in proportion to the vehicle speed. On the other hand, when the vehicle speed decreases, the pressure pump stops, opens the pressure reducing valve, and simultaneously operates the pressure reducing pump. To increase the response for shading.

둘째 기준은 조향휠의 회전각속도등에 따른 것으로 차속이 빠르더라도 조향휠의 거동이 급조향으로 확인되면 유입실의 압력을 낮추도록 상기의 감압밸브와 감압펌프를 제어한다는 것이다.The second criterion is based on the rotational angular velocity of the steering wheel. Even if the vehicle speed is high, the steering wheel controls the pressure reducing valve and the pressure reducing pump so as to lower the pressure of the inflow chamber when the steering wheel is confirmed as steep steering.

세번째 기준은 후진여부에 관한 것으로 저속이더라도 후진변속상태로 있는 경우에는 유압실의 압력을 높여서 조향핸들의 조작력을 높이기 위해 감압밸브를 닫고 가압펌프를 구동하도록 한다.The third criterion relates to the reversal status. When the engine is in reverse speed even at low speed, the pressure reducing valve is closed and the pressurized pump is operated to increase the operating pressure of the steering wheel by increasing the pressure in the hydraulic chamber.

전자제어장치는 전술한 제어를 위해 PWM제어기(17)의 출력펄스폭을 제어하여 가압펌프의 힘을 제어하고,제어스위치(18)을 제어하여 감압펌프의 온/오프 구동을 지시하고며 제어스위치(19)를 온/오프 제어하여 솔레노이드 밸브인 감압밸브(27)(27')를 온/오프 구동한다.The electronic control device controls the output pulse width of the PWM controller 17 to control the pressure of the pressure pump for controlling the above, and controls the control switch 18 to instruct the on / off driving of the pressure reducing pump and the control switch. (19) is controlled on / off to drive the pressure reducing valves 27 and 27 'which are solenoid valves on and off.

전술한 구성에 따른 본 발명의 작동에 따르면,차량의 속력이 증가함에 따라 전자제어장치는 가압펌프의 힘을 증가시켜 유압실의 유압을 증가 시키고 그 결과 조향력제어용 패드가 조향컬럼을 잡아주는 힘을 증가시키도록하여 조향핸들의 조작력을 감소시키도록한다.According to the operation of the present invention according to the above configuration, as the speed of the vehicle increases, the electronic control device increases the hydraulic pressure of the hydraulic chamber by increasing the force of the pressure pump, and as a result the steering force control pad to hold the steering column Increase it to reduce the steering force of the steering wheel.

한편,차량의 속력이 떨어지게 되면 전자제어장치는 감압밸브를 여는 것과 동시에 감압밸브를 작동시켜 유압실의 압력을 감소시키도록 한다.On the other hand, when the speed of the vehicle falls, the electronic control device opens the pressure reducing valve and operates the pressure reducing valve to reduce the pressure in the hydraulic chamber.

이때,감압밸브의 개도와 가압펌프,및 감압펌프의 힘은 사전에 설정된 비교기준에 따라 유압실이 정해진 정도의 압력을 가지도록 피드백 제어되도록 한다.At this time, the opening of the pressure reducing valve, the pressure of the pressure pump, and the pressure of the pressure reducing pump is to be feedback-controlled so that the hydraulic chamber has a predetermined degree of pressure according to a preset comparison criteria.

한편 차속과 별도로 조향핸들의 회전각속도를 측정하여 기준치이상인 경우라면 긴급조향이라고 판단하고,비록 고속일지라도 유압실의 압력을 낯추도록 감압펌프,감압밸브,및 가압밸브를 제어하도록 한다.On the other hand, by measuring the angular speed of the steering wheel separately from the vehicle speed, if it is above the reference value, it is determined that the steering is emergency, and the pressure reducing pump, the pressure reducing valve, and the pressure valve are controlled to reduce the pressure in the hydraulic chamber even at a high speed.

또한,변속기후진스위치가 차량이 후진상태를 지시하는 경우라면 비록 차량이 저속일 지라도 가압펌프를 이용하여 유압실의 압력을 일정정도 높이도록 한다.In addition, if the transmission reverse switch indicates that the vehicle is in the reverse state, even if the vehicle is low speed, the pressure in the hydraulic chamber is increased to a certain degree by using a pressure pump.

전술한 결과 차량의 조향핸들에 대한 조작력을 차속,조향휠회전각가속도,변속기후진스위치등에 따라 차별적으로 제어할 수 있게 되었으며,조작력 변화에 대한 응답성을 높이도록 하였다.As a result of the above, it is possible to differentially control the steering force of the steering wheel of the vehicle according to the vehicle speed, the steering wheel rotation angle acceleration, the transmission reversing switch, and the like.

Claims (4)

조향핸들과,조향컬럼과,조향기어박스와,타이로드를 포함하는 자동차의 조향제어장치에 있어서In a steering control apparatus for a vehicle including a steering wheel, a steering column, a steering gear box, and a tie rod, 조향컬럼주위에 설치된 유압실과;유압실내측 조향컬럼의 주위에 설치된 조향력제어용 패드와;상기의 유압실의 유압을 증가시키도록하는 가압펌프와;상기의 유압실의 유압을 감소시키는 감압펌프와;상기 유압실의 압력을 검출하는 유압검출센서와;차속센서와;상기 가압펌프의 회전을 제어하기위한 PWM제어기와;상기 차속센서의 검출결과와 유압검출센서의 결과를 사전 설정된 값과 비교하여 고속일수록 유압실의 압력이 증가하도록 상기의 감압펌프,감압밸브 및 PWM제어기를 제어하는 전자제어장치를 포함하는 것을 특징으로 하는 자동차용 조향력제어시스템A hydraulic chamber installed around a steering column; a steering force control pad disposed around a steering column inside the hydraulic chamber; a pressure pump for increasing the hydraulic pressure of the hydraulic chamber; a pressure reducing pump for reducing the hydraulic pressure of the hydraulic chamber; A hydraulic pressure sensor for detecting pressure in the hydraulic chamber; a vehicle speed sensor; and a PWM controller for controlling the rotation of the pressurized pump; a detection speed of the vehicle speed sensor and a result of the hydraulic pressure detection sensor are compared with a preset value for high speed; The steering control system for automobiles, comprising an electronic control device for controlling the pressure reducing pump, the pressure reducing valve and the PWM controller to increase the pressure in the hydraulic chamber. 제 1항에 있어서,조향휠센서를 추가로 포함하고,상기의 전자제어장치는 조향휠의 급조향시,유압실의 압력을 감압시키도록 감압밸브,감압펌프 및 PWM제어기를 제어하는 전자제어장치인 것을 특징으로하는 자동차용 조향력제어시스템The electronic control apparatus of claim 1, further comprising a steering wheel sensor, wherein the electronic control device controls the pressure reducing valve, the pressure reducing pump, and the PWM controller to reduce the pressure in the hydraulic chamber when the steering wheel is steered. Steering force control system for cars, characterized in that 제 2항에 있어서,변속기 후진스위치를 추가로 포함하고 상기의 전자제어장치는 변속기가 후진체결상태일 때,상기 유압실의 압력을 증가시키도록 감압밸브,감압펌프 및 PWM제어기를 제어하는 전자제어장치인 것을 특징으로 하는 자동차용 조향력제어시스템The electronic control apparatus of claim 2, further comprising a transmission reverse switch, wherein the electronic control apparatus controls the pressure reducing valve, the pressure reducing pump, and the PWM controller to increase the pressure of the hydraulic chamber when the transmission is in the backward tightening state. Automotive steering control system, characterized in that the device 제 1항 또는 제 3항중 어느한 항에 있어서,상기의 전자제어장치는 현재의 차량상태에 따른 유압실의 압력정도를 사전에 설정하고 있는 전자제어장치인 것을 특징으로 하는 자동차용 조향력제어시스템The steering control system for automobiles according to any one of claims 1 to 3, wherein the electronic control device is an electronic control device which sets in advance a pressure degree of a hydraulic chamber according to a current vehicle state.
KR1019970037082A 1997-08-02 1997-08-02 Power steering control system KR100475902B1 (en)

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Publication number Priority date Publication date Assignee Title
KR100432024B1 (en) * 2001-09-29 2004-05-17 현대자동차주식회사 Steering angle control device of steering system in vehicle

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JP3304487B2 (en) * 1993-03-12 2002-07-22 豊田工機株式会社 Electric pump type power steering device
KR970006048A (en) * 1995-07-07 1997-02-19 전성원 Speed sensitive steering force control
KR100249904B1 (en) * 1995-11-29 2000-04-01 정몽규 Safe steering system and the steering method for automobiles
KR19980022163A (en) * 1996-09-20 1998-07-06 박병재 Active steering device of the car

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100432024B1 (en) * 2001-09-29 2004-05-17 현대자동차주식회사 Steering angle control device of steering system in vehicle

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