KR100456866B1 - variable worm gear type electronic power steering of vehicle - Google Patents
variable worm gear type electronic power steering of vehicle Download PDFInfo
- Publication number
- KR100456866B1 KR100456866B1 KR10-2001-0040658A KR20010040658A KR100456866B1 KR 100456866 B1 KR100456866 B1 KR 100456866B1 KR 20010040658 A KR20010040658 A KR 20010040658A KR 100456866 B1 KR100456866 B1 KR 100456866B1
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- steering
- worm gear
- vehicle
- steering wheel
- driving
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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
- B62D5/0442—Conversion of rotational into longitudinal movement
- B62D5/0454—Worm gears
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H1/00—Toothed gearings for conveying rotary motion
- F16H1/02—Toothed gearings for conveying rotary motion without gears having orbital motion
- F16H1/04—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members
- F16H1/12—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with non-parallel axes
- F16H1/16—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with non-parallel axes comprising worm and worm-wheel
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- 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)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Power Steering Mechanism (AREA)
- Steering Control In Accordance With Driving Conditions (AREA)
Abstract
본 발명은 가변 웜 기어식 차량용 전동파워 조향장치에 관한 것으로, 차량의 선회를 위한 조향휠의 조타각이 일정 값 이상을 초과하면 구동수단의 모터를 이용하지 않고 별도의 모터를 이용하여 조향휠의 조작을 어시스트하여 에포트 빌드업 현상을 방지함에 그 목적이 있다.The present invention relates to an electric power steering apparatus for a variable worm gear type vehicle, and when a steering angle of a steering wheel for turning of a vehicle exceeds a predetermined value, the steering wheel is used by using a separate motor without using a motor of a driving means. Its purpose is to prevent manipulation of effort buildup by assisting with operations.
상기와 같은 목적을 달성하기 위한 본 발명은, 조향 휠(1)의 조작에 따라 토크 센서(10)와 차속 센서 및 스로틀밸브 개도 센서의 신호를 입력받는 콘트롤러(3)가 이들 신호 값에 대응하여 자체의 메모리에 저장된 소정 전류값 만큼 공급된 구동수단(4)의 회전력을 전달받아 차량의 진행방향을 바꾸는 조향수단(5)과, 상기 조향휠(1)의 조타각이 일정 값을 초과하는 경우 조향수단(5)을 구동하는 구동수단(4)의 전원 공급을 바이패스(By-pass)시켜 조향수단(5)을 구동하는 보조구동수단(20)으로 이루어진 것을 특징으로 한다.According to the present invention for achieving the above object, the controller (3) receiving the signals of the torque sensor 10, the vehicle speed sensor and the throttle valve opening degree sensor according to the operation of the steering wheel (1) corresponding to these signal values Steering means (5) for changing the traveling direction of the vehicle by receiving the rotational force of the driving means (4) supplied by a predetermined current value stored in its memory, and the steering angle of the steering wheel (1) exceeds a predetermined value Bypass the power supply of the drive means (4) for driving the steering means (5) is characterized by consisting of the auxiliary drive means 20 for driving the steering means (5).
Description
본 발명은 가변 웜 기어식 차량용 전동파워 조향장치에 관한 것으로, 보다 상세하게는 연속적인 선회조작에 따른 모터의 과도한 작동으로 인한 구동 전류의 부족을 방지할 수 있도록 된 가변 웜 기어식 차량용 전동파워 조향장치에 관한 것이다.The present invention relates to an electric power steering apparatus for a variable worm gear type vehicle, and more particularly, to an electric power steering for a variable worm gear type vehicle capable of preventing a lack of driving current due to excessive operation of a motor due to continuous turning operation. Relates to a device.
일반적으로 차량의 진행방향을 임의로 바꾸기 위한 조향 장치는 조향휠, 조향컬럼 등으로 이루어져 있으며, 운전자의 조작력은 조작기구의 조향 휠을 돌림으로써 기어기구의 조향 기어에 전달시켜 앞바퀴의 움직임을 바꾸는 것으로, 통상 운전자의 조향휠 조작력을 경감시켜주는 파워스티어링장치가 주로 사용되어진다.In general, the steering device for arbitrarily changing the direction of movement of the vehicle consists of a steering wheel, a steering column, etc., and the driver's operating force is transmitted to the steering gear of the gear mechanism by rotating the steering wheel of the operating mechanism, thereby changing the movement of the front wheels. Usually, a power steering device that reduces the steering wheel operating force of the driver is mainly used.
이러한 파워스티어링장치는 유압식과 전동식으로 크게 구분되는데 이중, 전동식인 EPS(전기동력조향, Electric Power Steering) 장치는 도 1에 도시된 바와 같이, 운전자에 의해 조향 휠(1)이 회전됨에 따라 조향컬럼에 고정된 토크 센서(10)의 변화된 저항 값에 해당하는 공급 전류의 변동 값이 인가됨과 동시에 차속 센서의 주행속도는 물론 스로틀밸브 개도 센서의 스로틀밸브 개도가 해당 콘트롤러(3 ; Electric Control Unit)에 인가되면, 이 콘트롤러(3)는 인가된 공급전류와 주행속도 및 스로틀밸브 개도에 대응하여 자체의 메모리에 저장된 소정 전류값 만큼 구동수단(4)에 전류를 공급하게 되고, 이에 따라 전원부로 부터 공급된 전류가 구동수단(4)의 구동모터를 소정속도로 회전시켜 조향수단(5)을 조작하게 됨에따라 차량의 진행방향을 바꾸게 된다.These power steering devices are largely divided into hydraulic and electric power. Among them, the electric EPS (Electric Power Steering) device, as shown in FIG. 1, is steered as the steering wheel 1 is rotated by the driver as shown in FIG. 1. The fluctuation value of the supply current corresponding to the changed resistance value of the torque sensor 10 fixed thereto is applied, and the throttle valve opening of the throttle valve opening sensor as well as the traveling speed of the vehicle speed sensor are applied to the corresponding controller (3). When applied, the controller 3 supplies current to the drive means 4 by a predetermined current value stored in its memory in response to the supplied supply current, traveling speed, and throttle valve opening degree, thereby supplying power from the power supply unit. The changed current rotates the driving motor of the driving means 4 at a predetermined speed to change the traveling direction of the vehicle as the steering means 5 is operated.
즉, 상기 조향수단(5)은 도 2에 도시된 바와 같이 회전되는 구동수단(4)의 구동모터에 연결되어 회전되는 웜(6a)과 치합된 웜기어(6b)로 이루어진 회전부(6)와, 이 회전부(6)의 회전에 따라 회전되는 피니언(7a)과 치합되 차륜을 좌·우로 변환시키는 랙(7b)으로 이루어진 이동부(7)로 이루어진다.That is, the steering means 5 is a rotating part 6 consisting of a worm gear 6b meshed with a worm 6a which is connected to the driving motor of the driving means 4 which is rotated as shown in FIG. It consists of the moving part 7 which consists of the rack 7b which meshes with the pinion 7a rotated by the rotation of this rotation part 6, and converts a wheel to left and right.
그러나, 이와 같은 전동식인 EPS는 배터리의 전원을 이용하여 구동수단(4)의 모터를 구동시켜 조향휠(1)의 어시시트(Assist)력을 발생하도록 되어 있어, 차량의 운행 중 전력소모가 크게 되면서 급격한 선회를 하게 되면 구동수단(4)에서 필요로 하는 전류의 양이 급격히 증가되지만 전류 공급의 한계로 인해 조향휠(1)의 조작이 무거워지는 현상 즉, 에포트 빌드업(Effort Build-Up)이 발생되는 문제가 있게 된다.However, such an electric EPS is to generate an assist force of the steering wheel 1 by driving the motor of the driving means 4 by using the power of the battery, so that the power consumption of the vehicle is greatly increased. If a sharp turn is made, the amount of current required by the driving means 4 increases rapidly, but the operation of the steering wheel 1 becomes heavy due to the limitation of the current supply, that is, the effort build-up. There is a problem that occurs.
이와 같은 조향휠(1)의 조작이 무거워지는 에포트 빌드업(Effort Build-Up)을 방지하려면 구동수단(4)의 모터 용량을 증대하여 해소 할 수 있지만, 모터의 용량을 증대하면 모터의 크기도 함께 증가되므로 설계시 레이아웃(Lay - Out)에 불리하고 제조원가의 상승을 가져오는 문제가 있게 된다.In order to prevent the effort build-up, in which the operation of the steering wheel 1 becomes heavy, it is possible to solve by increasing the motor capacity of the driving means 4, but if the capacity of the motor is increased, the size of the motor Since also increases with the design (Lay-Out) in the design, there is a problem that increases the manufacturing cost.
이에 본 발명은 상기와 같은 점을 감안하여 발명된 것으로, 차량의 선회를 위한 조향휠의 조타각이 일정 값 이상을 초과하면 구동수단의 모터를 이용하지 않고 별도의 모터를 이용하여 조향휠의 조작을 어시스트하여 에포트 빌드업 현상을방지함에 그 목적이 있다.Accordingly, the present invention has been made in view of the above. When the steering angle of the steering wheel for turning the vehicle exceeds a predetermined value, the steering wheel is operated by using a separate motor without using the motor of the driving means. Its purpose is to help prevent buildup phenomenon.
상기와 같은 목적을 달성하기 위한 본 발명은, 조향 휠의 조작에 따라 토크 센서와 차속 센서 및 스로틀밸브 개도 센서의 신호를 입력받는 콘트롤러가 이들 신호 값에 대응하여 자체의 메모리에 저장된 소정 전류값 만큼 공급된 구동수단의 회전력을 전달받아 차량의 진행방향을 바꾸는 조향수단과, 상기 조향휠의 조타각이 일정 값을 초과하는 경우 조향수단을 구동하는 구동수단의 전원 공급을 바이패스시켜 조향수단을 구동하는 보조구동수단으로 이루어진 것을 특징으로 한다.The present invention for achieving the above object, the controller that receives the signals of the torque sensor, the vehicle speed sensor and the throttle valve opening sensor in accordance with the operation of the steering wheel corresponding to these signal values by a predetermined current value stored in its own memory The steering means is driven by bypassing the power supply of the steering means for changing the traveling direction of the vehicle by receiving the rotational force of the supplied driving means and the driving means for driving the steering means when the steering angle of the steering wheel exceeds a predetermined value. Characterized in that it consists of an auxiliary drive means.
도 1은 종래에 따른 웜 기어식 차량용 전동파워 조향장치의 구성도1 is a configuration of the electric power steering apparatus for a worm gear type vehicle according to the prior art
도 2는 도 1의 조향장치의 회전 기어부의 구성단면도Figure 2 is a cross-sectional view of the rotary gear unit of the steering apparatus of Figure 1
도 3은 본 발명에 따른 가변 웜 기어식 차량용 전동파워 조향장치의 회전기어부에 대한 구성도3 is a block diagram of a rotary gear unit of a variable worm gear type electric power steering apparatus for a vehicle according to the present invention;
<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>
1 : 조향휠 2 : 조향컬럼1: Steering Wheel 2: Steering Column
3 : 콘트롤러 4 : 구동수단3: controller 4: driving means
5 : 조향수단 6 : 회전부5: steering means 6: rotating part
6a : 웜 6b : 웜기어6a: Worm 6b: Worm Gear
7 : 이동부 7a : 피니언7: moving part 7a: pinion
7a' : 스플라인 7b : 랙7a ': Spline 7b: Rack
10 : 토크센서 20 : 보조구동수단10: torque sensor 20: auxiliary driving means
21 : 판단부 22 : 스위칭부21: determination unit 22: switching unit
23 : 조작부 23a : 모터23: operation unit 23a: motor
23a' : 모터축 23b : 보조 웜기어23a ': Motor shaft 23b: Auxiliary worm gear
이하 본 발명의 실시예를 첨부된 예시도면을 참조로 상세히 설명한다.Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
도 3은 본 발명에 따른 가변 웜 기어식 차량용 전동파워 조향장치의 회전기어부에 대한 구성도를 도시한 것인바, 본 발명은 조향 휠(1)의 조작에 따라 토크 센서(10)와 차속 센서 및 스로틀밸브 개도 센서의 신호를 입력받는 콘트롤러(3)가 이들 신호 값에 대응하여 자체의 메모리에 저장된 소정 전류값 만큼 공급된 구동수단(4)의 회전력을 전달받아 차량의 진행방향을 바꾸는 조향수단(5)과, 상기 조향휠(1)의 조타각이 일정 값을 초과하는 경우 조향수단(5)을 구동하는 구동수단(4)의 전원 공급을 바이패스(By-pass)시켜 조향수단(5)을 구동하는 보조구동수단(20)으로 이루어진다.Figure 3 shows a block diagram of the rotary gear unit of the variable worm gear type electric power steering apparatus for a vehicle according to the present invention, the present invention is a torque sensor 10 and a vehicle speed sensor according to the operation of the steering wheel (1) and Steering means (3) for receiving a signal from the throttle valve opening sensor receives a rotational force of the driving means (4) supplied by a predetermined current value stored in its memory corresponding to these signal values to change the traveling direction of the vehicle ( 5) and if the steering angle of the steering wheel 1 exceeds a predetermined value, by bypassing the power supply of the driving means 4 for driving the steering means 5, the steering means 5 It consists of an auxiliary drive means 20 for driving.
여기서, 상기 조향수단(5)은 전술한 종래의 경우와 같이 회전되는 구동수단(4)의 구동모터에 연결되어 회전되는 웜(6a)과 치합된 웜기어(6b)로 이루어진 회전부(6)와, 이 회전부(6)의 회전에 따라 회전되는 피니언(7a)과 치합되 차륜을 좌·우로 변환시키는 랙(7b)으로 이루어진 이동부(7)로 이루어진다.Here, the steering means (5) is a rotating part (6) consisting of a worm gear (6b) meshed with a worm (6a) is rotated connected to the drive motor of the driving means (4) rotated as in the conventional case described above; It consists of the moving part 7 which consists of the rack 7b which meshes with the pinion 7a rotated by the rotation of this rotation part 6, and converts a wheel to left and right.
또한, 상기 보조구동수단(20)은 조향컬럼(2)에 구비된 토크센서(10)나 조향휠(1)의 조타각을 감지하는 조향휠센서(도시되어 있지 않음)의 신호를 받아 조향휠(1)의 조타각이 일정값을 초과하는지 여부를 판단하는 판단부(21)와, 이 판단부(21)의 신호에 따라 각각 연결되어 차량의 배터리전원을 통전시키는 스위칭부(22) 및 이 스위칭부(22)의 조작에 따라 정회전과 역회전되어 조향휠(1)의 조타각에 따라 조향수단(5)을 구동하는 조작부(23)로 이루어진다.In addition, the auxiliary driving means 20 receives a signal of a steering wheel sensor (not shown) for detecting the steering angle of the torque sensor 10 or the steering wheel 1 provided in the steering column (2) steering wheel Determination unit 21 for determining whether the steering angle of (1) exceeds a predetermined value, and the switching unit 22 is connected in accordance with the signal of the determination unit 21 to energize the battery power of the vehicle and the In accordance with the operation of the switching unit 22 consists of an operating unit 23 for driving the steering means 5 in accordance with the steering angle of the forward and reverse rotation of the steering wheel (1).
여기서, 상기 조작부(23)는 스위칭부(22)를 통해 공급된 전원에 의해 정·역회전되는 모터(23a)와, 이 모터(23a)의 모터축(23a')에 치합되어 회전되어 조향수단(5)의 피니언(7a)을 회전시키도록 도 4에 도시된 바와 같이 스플라인(7a')을 매개로 결합된 보조웜기어(23b)로 이루어진다.Here, the operation unit 23 is engaged with the motor 23a which is forward and reverse rotated by the power supplied through the switching unit 22 and the motor shaft 23a 'of the motor 23a, and is rotated by steering means. As shown in FIG. 4, the auxiliary worm gear 23b coupled through the spline 7a 'is rotated so as to rotate the pinion 7a of (5).
이때, 상기 보조웜기어(23b)는 조향수단(5)의 회전부(6)를 구성하면서 구동수단(4)에 의해 회전되는 웜기어(6b)와는 서로 다른 피치(Pitch)를 형성함은 물론이다.상기와 같이, 보조웜기어(23b)의 피치를 웜기어(6b)와 다르게 하는 이유는 기어비를 다르게 함으로써 이동거리는 길어지지만 출력을 더 크게 조절하고자 함이다.At this time, the auxiliary worm gear 23b forms a rotation part 6 of the steering means 5 and forms a different pitch from the worm gear 6b rotated by the driving means 4. As described above, the reason why the pitch of the auxiliary worm gear 23b is different from that of the worm gear 6b is to change the gear ratio so that the moving distance becomes longer, but the output is adjusted to be larger.
또한, 상기 보조구동수단(20)의 판단부(21)는 조향휠(1)의 조타각이 약 90°이상으로 변화되면 조작부(23)를 구동시키게 된다.In addition, the determination unit 21 of the auxiliary driving means 20 drives the operation unit 23 when the steering angle of the steering wheel 1 changes to about 90 ° or more.
그리고, 상기 판단부(21)는 프로그램을 내장한 별도의 콘트롤러를 이용할 수 도 있지만, 바람직하게는 구동수단(4)의 동작을 제어하는 콘트롤러(3)를 이용함은 물론이다.In addition, although the determination unit 21 may use a separate controller incorporating a program, the controller 21 preferably controls the operation of the driving means 4.
이에 따라, 일반적인 차량의 주행은 전술한 바와 같이 운전자가 조향 휠(1)을 조작하게 되면, 이 조향휠(1)의 회전에 따라 조향컬럼(2)에 고정된 토크 센서(10)의 변화된 저항 값과 차속 센서 및 스로틀밸브 개도 센서의 신호가 콘트롤러(3)에 인가되고, 이에 따라 상기 콘트롤러(3)는 인가된 공급전류와 주행속도 및 스로틀밸브 개도에 대응하여 자체의 메모리에 저장된 소정 전류값 만큼 구동수단(4)에 전류를 공급하여 구동수단(4)의 구동모터를 소정속도로 회전시켜주게 된다.Accordingly, when the driver operates the steering wheel 1 as described above, the general vehicle travels with the changed resistance of the torque sensor 10 fixed to the steering column 2 according to the rotation of the steering wheel 1. Value and a signal of the vehicle speed sensor and the throttle valve opening sensor are applied to the controller 3, so that the controller 3 has a predetermined current value stored in its memory in response to the applied supply current, the traveling speed and the throttle valve opening. By supplying a current to the drive means 4, the drive motor of the drive means 4 is rotated at a predetermined speed.
이와 같이 구동수단(4)의 회전에 따라 이 구동수단(4)에 치합된 조향수단(5)의 회전부(6)를 이루는 웜(6a)과 웜기어(6b)가 회전되면서 이동부(7)를 이루는 피니언(7a)을 회전시켜, 이 피니언(7a)에 치합된 랙(7b)을 좌·우로 이동시켜 차량의 진행방향을 바꾸게된다.As the drive means 4 rotates, the worm 6a and the worm gear 6b constituting the rotating part 6 of the steering means 5 engaged with the drive means 4 rotate, thereby moving the moving part 7. The pinion 7a is rotated, and the rack 7b engaged with the pinion 7a is moved left and right to change the traveling direction of the vehicle.
한편, 차량의 주행 운전자가 조향휠(1)을 급격하게 즉, 그 조타각이 약 90°이상으로 변화되면, 이 조타각의 신호 값을 받은 콘트롤러(3)가 구동수단(4)으로 통전되는 전원을 바이패스시켜 보조구동수단(20)을 작동시키게 되는데 즉, 상기 보조구동수단(20)의 스위칭부(21)를 통해 배터리 전원이 조작부(23)에 통전되면, 이 조작부(23)의 모터(23a)가 시계방향회전 또는 반 시계 방향 회전되면서 이에 치합된 보조웜기어(23b)를 회전시키게 된다.상기 실시예에서 조타각이 90°이상인 경우에만 보조구동수단(20)을 작동시키는 이유는, 통상적으로 조향휠센서에 의해 측정된 조타각이 대략 90°이상이 되는 순간부터 구동수단(4)의 구동모터에 무리가 생기기 때문이다.On the other hand, when the driving driver of the vehicle suddenly turns the steering wheel 1, that is, the steering angle is changed to about 90 ° or more, the controller 3 receiving the signal value of the steering angle is energized to the driving means 4. Bypassing the power to operate the auxiliary drive means 20, that is, when the battery power is supplied to the operation unit 23 through the switching unit 21 of the auxiliary drive means 20, the motor of the operation unit 23 The 23a is rotated clockwise or counterclockwise to rotate the auxiliary worm gear 23b engaged therewith. In the above embodiment, the auxiliary driving means 20 is operated only when the steering angle is 90 ° or more. This is because, from the moment when the steering angle measured by the steering wheel sensor becomes approximately 90 ° or more, the driving motor of the driving means 4 is excessively generated.
이에 따라, 조향수단(5)의 회전부(6)를 이루는 이동부(7)를 이루는 피니언(7a)을 회전시켜, 이 피니언(7a)에 치합된 랙(7b)을 좌·우로 이동시켜 차량의 진행방향을 바꾸게된다.Accordingly, the pinion 7a constituting the moving part 7 constituting the rotation part 6 of the steering means 5 is rotated, and the rack 7b engaged with the pinion 7a is moved left and right. The direction of change will change.
이때, 상기 조작부(23)의 모터(23a)회전 방향은 조향휠(1)의 회전 방향에 따라 각각 대응되게 연결되는 스위칭부(22)에 따라 변화됨은 물론이다.At this time, the rotation direction of the motor 23a of the operation unit 23 is changed depending on the switching unit 22 correspondingly connected according to the rotation direction of the steering wheel 1, of course.
이상 설명한 바와 같이 본 발명에 의하면, 운전자가 차량을 급선회시키기 위해 조향휠을 일정 값 이상으로 조타하여 구동수단에서 필요로 하는 전류의 양이 급격히 증가되는 경우에는 콘트롤러가 구동수단으로 전원을 통전 시키지 않고 보조구동수단으로 전원을 통전시켜 전류 공급의 한계로 인해 발생되는 조향휠의 조작이 무거워지는 에포트 빌드업 현상을 근본적으로 방지할 수 있는 효과가 있게 된다.As described above, according to the present invention, when the driver steers the steering wheel more than a predetermined value in order to sharply turn the vehicle, and the amount of current required by the driving means increases sharply, the controller does not energize the driving means. Through the power supply to the auxiliary drive means there is an effect that can fundamentally prevent the effort build-up phenomenon that the operation of the steering wheel caused by the limitation of the current supply is heavy.
Claims (9)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2001-0040658A KR100456866B1 (en) | 2001-07-07 | 2001-07-07 | variable worm gear type electronic power steering of vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2001-0040658A KR100456866B1 (en) | 2001-07-07 | 2001-07-07 | variable worm gear type electronic power steering of vehicle |
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| Publication Number | Publication Date |
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| KR20030004908A KR20030004908A (en) | 2003-01-15 |
| KR100456866B1 true KR100456866B1 (en) | 2004-11-10 |
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| KR10-2001-0040658A Expired - Fee Related KR100456866B1 (en) | 2001-07-07 | 2001-07-07 | variable worm gear type electronic power steering of vehicle |
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| KR20030018559A (en) * | 2001-08-30 | 2003-03-06 | 현대자동차주식회사 | variable worm gear type electronic power steering of vehicle |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06127409A (en) * | 1992-10-19 | 1994-05-10 | Nippondenso Co Ltd | Rear wheel steering device for vehicle |
| JPH08331799A (en) * | 1995-05-31 | 1996-12-13 | Shigeto Suzuki | Motor controller for motor-driven power steering |
| KR19980030062A (en) * | 1996-10-29 | 1998-07-25 | 박병재 | Automotive Electronic Power Steering |
-
2001
- 2001-07-07 KR KR10-2001-0040658A patent/KR100456866B1/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06127409A (en) * | 1992-10-19 | 1994-05-10 | Nippondenso Co Ltd | Rear wheel steering device for vehicle |
| JPH08331799A (en) * | 1995-05-31 | 1996-12-13 | Shigeto Suzuki | Motor controller for motor-driven power steering |
| KR19980030062A (en) * | 1996-10-29 | 1998-07-25 | 박병재 | Automotive Electronic Power Steering |
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