KR20160077652A - Roll angle measuring device for vehicle roll control - Google Patents

Roll angle measuring device for vehicle roll control Download PDF

Info

Publication number
KR20160077652A
KR20160077652A KR1020140187805A KR20140187805A KR20160077652A KR 20160077652 A KR20160077652 A KR 20160077652A KR 1020140187805 A KR1020140187805 A KR 1020140187805A KR 20140187805 A KR20140187805 A KR 20140187805A KR 20160077652 A KR20160077652 A KR 20160077652A
Authority
KR
South Korea
Prior art keywords
hall
magnetic force
pinion gear
driven pinion
vehicle
Prior art date
Application number
KR1020140187805A
Other languages
Korean (ko)
Inventor
이한구
Original Assignee
주식회사 인팩
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.)
Filing date
Publication date
Application filed by 주식회사 인팩 filed Critical 주식회사 인팩
Priority to KR1020140187805A priority Critical patent/KR20160077652A/en
Publication of KR20160077652A publication Critical patent/KR20160077652A/en

Links

Images

Classifications

    • 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
    • B60W40/00—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models
    • B60W40/10—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models related to vehicle motion
    • B60W40/112—Roll movement
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/30—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring angles or tapers; for testing the alignment of axes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Mathematical Physics (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Vehicle Body Suspensions (AREA)

Abstract

Disclosed is an angle measuring device for a vehicle roll control system. According to an embodiment of the present invention, the angle measuring device for a vehicle roll control system comprises: a cylindrical actuator housing; an annular drive gear which is connected to a stabilizer bar of a vehicle, rotates with the stabilizer bar about a rotary shaft of the stabilizer bar in the actuator housing, and has a gear formed on an outer circumferential surface thereof; a driven pinion gear which rotates according to rotation of the drive gear in the actuator housing, and comprises a magnet therein; and a position sensor module having a Hall sensor unit fixed in a cylindrical actuator to detect a rotational angle of the driven pinion gear. The Hall sensor unit comprises a first Hall IC arranged to face the driven pinion gear and a second Hall IC arranged in parallel with the first Hall IC to face the driven pinion gear.

Description

Technical Field [0001] The present invention relates to an angle measuring apparatus for a roll control system of a vehicle,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an angle measuring apparatus for a roll control system, and more particularly, to an apparatus for detecting a rotation angle of a stabilizer bar of a vehicle using two hall sensors.

Generally, a stabilizer bar of a vehicle is installed to control the rolling of the vehicle body that occurs when the vehicle is turning or running on a rough road surface.

This stabilizer bar is a torsion bar that is installed between two control arms and is twisted when the vehicle turns. However, the stabilizer bar is resistant to such torsion, preventing the vehicle body from tipping when the vehicle is turning and reducing rolling.

The Active Roll Control System (ARS) has a hydraulic active roll control system with a hydraulic actuator on the stabilizer bar and an electromotive active roll control system that is less energy consuming, environmentally friendly and suitable for high voltage environments. The active roll control system uses an electronic control unit (ECU) of the vehicle and an actuator to control the twist angle of the stabilizer bar. By controlling the twist angle, it is possible to reduce the rolling angle of the vehicle when cornering, thereby enhancing the stability of the vehicle and the cornering force.

The operation principle of the conventional electromotive active roll control system will be described as follows.

When the vehicle turns, a rolling force due to the centrifugal force is generated, and the inner lower arm is heard and the outer lower arm is lowered. The active roll control system controls the torsion angle of the stabilizer bar according to the centrifugal force (lateral acceleration), thereby limiting the behavior of the lower arm and reducing the roll angle of the vehicle.

Most of the actuators of the rotary type electric active roll control system are mounted at the center of the two stabilizer. The actuator of the motorized active roll control system uses the high efficiency motor which is easy to connect with the stabilizer bar and the reducer, and reduces the capacity and size of the motor by using the reducer with high reduction ratio. The motor is composed of a rotor and a stator, the stator is fixed to the housing, and the rotor is connected to the reducer to transmit the torque directly to the stabilizer. The opposite stabilizer bar is connected to the housing and the same torque is transmitted to both ends of the stabilizer.

In the active roll control system, twist angle control of the stabilizer bar is important. For this purpose, a device capable of measuring the twist angle of the stirrer bar over the entire range of rotation angle is needed.

An embodiment of the present invention is to provide an improved angle measuring device capable of measuring a rotation angle of an entire range from 0 to 360 in an angle measuring device for detecting a rotation angle of a stirrer bar.

In order to achieve the above object, an angle measuring apparatus for a roll control system of a vehicle according to the present invention comprises: a cylindrical actuator housing; A ring-shaped driving gear connected to a stabilizer bar of the vehicle and rotatable together with the stirrer bar about a rotation axis of the stirrer bar in the actuator housing and having a gear on the outer circumferential surface; A driven pinion gear rotating in accordance with rotation of the driving gear in the actuator housing and including a magnet therein; And a position sensor module fixed to the cylindrical actuator and having a hole sensor portion for detecting a rotation angle of the driven pinion gear,

The Hall sensor unit includes: a first Hall IC arranged to face the driven pinion gear; And a second Hall IC arranged side by side with the first Hall IC facing the driven pinion gear.

In addition, the position sensor module may be in the form of a disk having a cavity through which the stirrer bar can pass.

The first Hall IC and the second Hall IC each include a first magnetic force detecting portion and a second magnetic force detecting portion for measuring a magnetic field change of the magnet, Wherein the second magnetic force detection portion of the IC is positioned deviated from the center of the first Hall IC and the center of the second Hall IC and is spaced apart from the center of the second Hall IC by a distance between the first magnetic force detection portion and the second magnetic force detection portion The one-hole IC and the second hole IC may be arranged.

The first Hall IC and the second Hall IC are the same, and the second Hall IC may be disposed on the first Hall IC side while being rotated 180 degrees with respect to the first Hall IC.

The Hall sensor unit may use the measured value of the first Hall IC as a default value and the measured value of the second Hall IC for a period in which the measured value of the first Hall IC deviates from the linearity.

The Hall sensor unit uses the measured value of the first Hall IC as a default value when the PWM duty value of the first Hall IC is more than 15% and less than 85%, and the PWM duty value of the first Hall IC is 15% or 85% or more, the measured value of the second Hall IC can be used.

The angle measuring apparatus for a roll control system of a vehicle according to an embodiment of the present invention can measure the angle of rotation of the stirrer bar from 0 ° to 360 ° over the entire range using two Hall ICs.

Further, as the reliability of the stabilizer torsional rotational angle measurement is improved, the performance of the roll control system of the vehicle can be improved.

1 is a sectional view of a roll control system provided with an angle measuring apparatus for a roll control system of a vehicle according to an embodiment of the present invention.
2 is a perspective view of an angle measuring apparatus for a roll control system of a vehicle according to an embodiment of the present invention.
3 is a plan view of a position sensor module included in an angle measuring apparatus for a roll control system of a vehicle shown in FIG.
FIG. 4 is a view for explaining the arrangement relationship of the first Hall IC and the second Hall IC provided in the position sensor module of FIG. 3. FIG.
5 is a diagram for explaining the linearity of the output of the Hall IC shown in FIG.
Fig. 6 is a diagram for explaining the use switching timing of the first Hall IC and the second Hall IC.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly explain the present invention in the drawings, parts not related to the description are omitted.

When an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, but other elements may be present in between Can be understood. On the other hand, when it is mentioned that an element is "directly connected" or "directly connected" to another element, it can be understood that no other element exists in between.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions may include plural expressions unless the context clearly dictates otherwise.

In this specification, the terms "comprise", "comprising", and the like are used interchangeably to designate the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of features, numbers, steps, operations, components, parts, or combinations thereof.

Also, unless otherwise defined, all terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs . Terms such as those defined in commonly used dictionaries can be interpreted as having a meaning consistent with the meaning in the context of the related art and, unless explicitly defined herein, are interpreted in an ideal or overly formal sense .

In addition, the following embodiments are provided so as to explain the invention more clearly to a person having ordinary skill in the art, the shape and the size of the elements in the drawings and the like can be exaggerated for clarity.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view of a roll control system provided with an angle measurement device for a roll control system of a vehicle according to an embodiment of the present invention, and FIG. 2 is a schematic diagram of an angle measurement device for a roll control system of a vehicle according to an embodiment of the present invention. FIG. 3 is a plan view of a position sensor module included in an angle measuring apparatus for a roll control system of a vehicle shown in FIG.

1 to 3, an angle measuring apparatus for a roll control system of a vehicle according to an embodiment of the present invention includes an Active Stabilizer System (ARS) of a vehicle, It is designed to measure the twist angle.

The angle measuring device for the roll control system of the vehicle includes an actuator housing 12, a drive gear 14, a driven pinion gear 17, and a position sensor module 100.

The cylindrical actuator housing 12 has a cylindrical shape and a pair of stabilizer bars of the vehicle, that is, a left stabilizer bar and a right stabilizer bar, are respectively connected to both ends of the actuator. 1, only the left stabilizer bar 16 of the vehicle is shown for convenience of explanation. The actuator housing 12 includes a motor (not shown) and a speed reducer 15 connected to the output shaft of the motor to decelerate rotation. The stirrer bar 15 is fixedly connected to the speed reducer output part 15-1 by a nut 13 on the coaxial line of the speed reducer 15. [

The driving gear 14 is provided to measure the rotation angle (twist angle) of the stirrer bar 16. The driving gear 14 is fixed to the outer peripheral surface of the output portion 15-1 of the speed reducer 15 in the form of a ring provided with gears on the outer peripheral surface. Therefore, the driving gear 14 rotates together with the rotation of the output portion 15-1 of the speed reducer 15. [ In other words, the driving gear 14 is connected to the stabilizer bar 16 through the output portion 15-1 of the speed reducer 15 and the nut 13, and the stabilizer bar 16 is fixed in the actuator housing 12, And rotates with the stabilizer 16 about the rotation axis of the stabilizer 16.

The driven pinion gear 17 is located in the actuator housing 12 and meshes with the driving gear 14 and is rotated in accordance with the rotation of the driving gear 14. The driven pinion gear 17 includes a magnet inside. Therefore, as the driven pinion gear 17 rotates in accordance with the rotation of the driving gear 14, the magnet provided therein also rotates, so that the direction of the magnetic field formed by the magnet inside the driven pinion gear 17 changes.

The position sensor module 100 measures the rotation angle of the stirrer bar 16 and measures a rotation angle using a Hall effect with the inner magnet of the driven pinion gear 17. [ The position sensor module 100 is fixed in the actuator housing 12 and includes therein a hole sensor part 120 for measuring a rotation angle of the driven pinion gear 17 using a Hall effect have. The Hall sensor unit 120 is disposed on the position sensor module 100 so as to face the driven pinion gear 17.

In the illustrated embodiment, the position sensor module 100 is formed of a printed circuit board (PCB) having a hollow shape in which the stirrer bar 16 can penetrate. The output portion 15-1 of the speed reducer 15 connected to the stirrer bar 16 passes through the hollow in place of the stirrer bar 16 in this embodiment. The position sensor module 100 controls the hall sensor unit 120 and other sensors and electric devices including the hall sensor unit 120 and receives signals detected by the hall sensor unit 120, And a microprocessor 140 for calculating a rotation angle (twist angle) of the rotor 16.

FIG. 4 is a view for explaining the arrangement relationship of the first Hall IC and the second Hall IC provided in the position sensor module of FIG. 3. FIG.

Hereinafter, the Hall sensor unit 120 will be described in detail with reference to FIGS. 3 and 4. FIG.

3 and 4, the Hall sensor unit 120 according to an embodiment of the present invention includes two Hall ICs 122 and 124, that is, a first Hall IC 122 and a second Hall IC 124, . Both the first Hall IC 122 and the second Hall IC 124 are disposed to face the driven pinion gear 17. More specifically, the second Hall IC 124 is disposed side by side with the first Hall IC 122, and may be packaged in the form of a single chip 120 as shown, but is not limited to, It is also possible to configure two chips side by side.

The first Hall IC 122 includes a first magnetic force detection unit 123 for measuring a magnetic field change of the magnet and the second Hall IC 124 also includes a second magnetic force detection unit 125 . Both the first magnetic force detection unit 123 and the second magnetic force detection unit 125 are provided for measuring a change in magnetic flux due to the rotation of the driven pinion gear 17.

The second magnetic force detecting unit 125 is also located at a center of the second Hall IC 124. The first magnetic force detecting unit 123 is located off the center of the first Hall IC 122, As shown in Fig.

In this embodiment, the first Hall IC 122 and the second Hall IC 124 are disposed such that the separation distance between the first magnetic force detection portion 123 and the second magnetic force detection portion 125 is minimized. If the first Hall IC 122 and the second Hall IC 124 are the same product, the first magnetic force detection unit 123 and the second magnetic force detection unit 125 are connected to the first Hall IC 122 and the second Hall IC 124, Lt; RTI ID = 0.0 > 124 < / RTI > In this case, in order to minimize the separation distance between the first magnetic force detection unit 123 and the second magnetic force detection unit 125, the second Hall IC 124 is connected to the first Hall IC 122 Is arranged on the side surface of the first Hall IC 122 while being rotated by 180 degrees.

Hereinafter, operation of an angle measuring apparatus for a roll control system of a vehicle according to an embodiment of the present invention will be described.

Fig. 5 is a diagram for explaining the linearity of the output of the Hall IC shown in Fig. 4, and Fig. 6 is a diagram for explaining a use switching timing of the first Hall IC and the second Hall IC.

Referring to FIG. 5, the output characteristics of the first Hall IC 122 and the second Hall IC 124 may not guarantee linearity in a certain section. The Hall ICs 122 and 124 all output an output value in the form of a PWM duty. As shown in the figure, each of the single Hall ICs 122 and 124 has a linear PWM duty for some intervals, for example, Is guaranteed. On the other hand, the linearity may not be ensured in other sections, that is, in a section with a rotation angle of less than 5 degrees or a section exceeding 340 degrees. In other words, the linearity of the output value is guaranteed in the section where the PWM duty value is more than 15% but less than 85%, but in the section where the output value is less than 15% or more than 85%, the rotation angle through the output value of the single Hall IC 122 There is a problem that the reliability in calculation can be deteriorated.

In order to solve this problem, in this embodiment, as shown in FIG. 4, two Hall ICs 122 and 124 are used and the second Hall IC 124 is connected to the first Hall IC 122 Is arranged on the side surface of the first Hall IC 122 while being rotated. The measured value of the first Hall IC 122 is used as a basis for detecting the rotation angle of the stabilizer bar 16 and the second Hall IC 122 124, the reliability of the rotation angle of the stabilizer bar 16 between the front and the back, that is, from 0 to 360 can be assured.

6, first, the rotation angle of the stirrer bar 16 is measured using the first Hall IC 122. In this case, If the period in which the linearity of the output characteristics of the first Hall IC 122 is ensured is less than 85% of the PWM duty value exceeding 15%, the rotational angle is measured through the output value of the first Hall IC 122 do. If the output value of the first Hall IC 122 is 15% or less of the PWM duty value or 85% or more, the linearity of the output value is not ensured, and the reliability of the calculated rotation angle may be deteriorated. In this case, the second Hall IC 124 disposed on the side of the first Hall IC 122 while being rotated 180 degrees with respect to the first Hall IC 122 is connected to the first Hall IC 122, The PWM duty value is more than 15% and less than 85% according to the positional relationship of the IC 124. [ Therefore, the output value of the second Hall IC 124 is reliable with respect to the calculated rotation angle since the linearity is ensured. Therefore, the rotation angle of the stirrer 16 is detected using the second Hall IC 124 in place of the first Hall IC 122 in the corresponding section. The PWM duty cycle output of the first Hall IC 122 and the second Hall IC 124 is a value that can be set by a user through a calibration operation in accordance with an input angle, The range of the linearity can be previously set to 15% to 85% through a calibration operation according to the height of the magnet accommodated in the gear 17.

As described above, according to the angle measuring apparatus for a roll control system of a vehicle according to an embodiment of the present invention, by using two Hall ICs, it is possible to solve the problem of nonlinear sections of output values occurring when a single Hall IC is used . Therefore, the angle of rotation of the stirrer bar can be measured over the entire range from 0 ° to 360 °.

Further, as the reliability of the stabilizer torsional rotational angle measurement is improved, the performance of the roll control system of the vehicle can be improved.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

10: vehicle roll control system 12: actuator housing
13: Nut 14: Driving gear
15: Reduction gear 16: Stabilizer bar
17: Pinion gear 100: Position sensor module
120: Hall sensor unit 140: Microprocessor
122: first Hall IC 123: first magnetic force detecting section
124: second Hall IC 125; The second magnetic force detection unit

Claims (6)

A cylindrical actuator housing;
A ring-shaped driving gear connected to a stabilizer bar of the vehicle and rotatable together with the stirrer bar about a rotation axis of the stirrer bar in the actuator housing and having a gear on the outer circumferential surface;
A driven pinion gear rotating in accordance with rotation of the driving gear in the actuator housing and including a magnet therein; And
And a position sensor module fixed to the cylindrical actuator and having a hole sensor portion for detecting a rotation angle of the driven pinion gear,
The Hall sensor unit includes:
A first Hall IC arranged to face the driven pinion gear; And
And a second hole IC disposed side by side with the first Hall IC facing the driven pinion gear. The method according to claim 1,
Wherein the position sensor module is in the shape of a disk having a hollow through which the stirrer bar can pass. The method according to claim 1,
The first Hall IC and the second Hall IC each include a first magnetic force detecting portion and a second magnetic force detecting portion for measuring a magnetic field change of the magnet,
Wherein the first magnetic force detecting portion of the first Hall IC and the second magnetic force detecting portion of the second Hall IC are deflected away from the center of the first Hall IC and the center of the second Hall IC,
Wherein the first Hall IC and the second Hall IC are disposed such that a distance between the first magnetic force detection unit and the second magnetic force detection unit is minimized. The method according to claim 1,
Wherein the first Hall IC and the second Hall IC are the same and the second Hall IC is disposed on a side surface of the first Hall IC while being rotated 180 degrees with respect to the first Hall IC. Angle measuring device. The method according to any one of claims 1 to 4,
The Hall sensor unit includes:
Wherein the measured value of the first Hall IC is used as a default value and the measured value of the second Hall IC is used for a period in which the measured value of the first Hall IC deviates from the linearity. Device. The method of claim 5,
The Hall sensor unit includes:
Wherein the measured value of the first Hall IC is used as a default value when the PWM duty value of the first Hall IC exceeds 15% and less than 85%, and the PWM duty value of the first Hall IC is 15% The measured value of the second Hall IC is used.
KR1020140187805A 2014-12-24 2014-12-24 Roll angle measuring device for vehicle roll control KR20160077652A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020140187805A KR20160077652A (en) 2014-12-24 2014-12-24 Roll angle measuring device for vehicle roll control

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020140187805A KR20160077652A (en) 2014-12-24 2014-12-24 Roll angle measuring device for vehicle roll control

Publications (1)

Publication Number Publication Date
KR20160077652A true KR20160077652A (en) 2016-07-04

Family

ID=56501074

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020140187805A KR20160077652A (en) 2014-12-24 2014-12-24 Roll angle measuring device for vehicle roll control

Country Status (1)

Country Link
KR (1) KR20160077652A (en)

Similar Documents

Publication Publication Date Title
JP5893498B2 (en) Power steering device and control device for power steering device
US7677114B2 (en) Torque sensor for electric power steering system
US9970834B2 (en) Torque sensor and electric power steering system
JP5580427B2 (en) Steering torque and steering angle measuring device and vehicle steering device provided with the same
KR101128608B1 (en) The Torque Angle Sensor and The Electronic Power Steering Apparatus Having The Same
JP5923002B2 (en) Torque detector and electric actuator
JP6310024B2 (en) Torque index sensor
KR20030028704A (en) Rotational angle detecting device, Torque detecting device and steering apparatus
JP2009080020A (en) Torque detector
KR20030074405A (en) Rotational angle detecting apparatus, torque detecting apparatus and steering apparatus
KR101637597B1 (en) Torque index sensor having structure for magnetic shielding
KR20120069869A (en) Torque angle sensor
CN101398290A (en) Angle measurement device
KR20130136765A (en) Torque sensor
EP3448742B1 (en) Angular rotation sensor system
KR101257583B1 (en) Torque sensor of steering system
KR20160077652A (en) Roll angle measuring device for vehicle roll control
KR20120133404A (en) Torque angle sensor
KR101859768B1 (en) Torque Index Sub Angle Sensor
KR101208178B1 (en) Electronic power steering apparatus having torque sensor
KR20120027937A (en) Torque sensor of steering system
JP2011080783A (en) Relative angle detector, rotation angle detector, and power steering device
GB2379277A (en) Torque sensing apparatus
JP6280980B2 (en) Torque detection device
KR100855794B1 (en) Contactless torque sensor for electronic power steering system

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E601 Decision to refuse application