KR20120001376A - Structure of wheel speed sensor for anti-lock brake system - Google Patents

Structure of wheel speed sensor for anti-lock brake system Download PDF

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Publication number
KR20120001376A
KR20120001376A KR1020100062124A KR20100062124A KR20120001376A KR 20120001376 A KR20120001376 A KR 20120001376A KR 1020100062124 A KR1020100062124 A KR 1020100062124A KR 20100062124 A KR20100062124 A KR 20100062124A KR 20120001376 A KR20120001376 A KR 20120001376A
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South Korea
Prior art keywords
light emitting
light
wheel speed
speed sensor
emitting unit
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KR1020100062124A
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Korean (ko)
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최용하
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현대자동차주식회사
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Priority to KR1020100062124A priority Critical patent/KR20120001376A/en
Publication of KR20120001376A publication Critical patent/KR20120001376A/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/36—Devices characterised by the use of optical means, e.g. using infrared, visible, or ultraviolet light
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K26/00—Arrangements or mounting of propulsion unit control devices in vehicles
    • B60K26/04—Arrangements or mounting of propulsion unit control devices in vehicles of means connecting initiating means or elements to propulsion unit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • 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
    • G01D5/26—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 characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Electromagnetism (AREA)
  • Power Engineering (AREA)
  • Regulating Braking Force (AREA)

Abstract

PURPOSE: A wheel speed sensor for an ABS is provided to prevent a wheel speed measurement error due to the variation of an air gap and reduce manufacturing costs. CONSTITUTION: A light emitting unit is mounted on a wheel hub(40). The light emitting unit emits light in one direction and rotates around an axle. A light receiving unit(50) senses light irradiated from the light emitting unit and is separated from the wheel hub. Light emitted from the light emitting unit passes through the light receiving unit if the light emitting unit rotates.

Description

ＡＢＳ용 휠스피드 센서 구조{Structure of wheel speed Sensor for anti-lock brake system}Structure of wheel speed sensor for anti-lock brake system

본 발명은 ABS용 휠스피드 센서(WSS: Wheel speed sensor)의 구조에 관한 것으로 더욱 상세하게는, 종래의 문제점을 해결하기 위해 광학식으로 센싱하는 ABS용 휠 스피드 센서 구조에 관한 것이다.
The present invention relates to a structure of a wheel speed sensor (WSS) for ABS, and more particularly, to an ABS wheel speed sensor structure optically sensed to solve a conventional problem.

ABS는 주행 중 제동시에 타이어의 잠김을 방지하는 예방 시스템으로 차량의 안전장치로서 널리 적용되고 있다. ABS is widely used as a safety device of a vehicle as a preventive system that prevents the tire from locking while driving.

차량의 주행시에 각 타이어에 실리는 하중 및 노면의 상태는 차이가 있다. 이런 상태에서 급제동을 하게 되면 차량은 진행하고 바퀴만 멈춰있는 록업(lock-up) 현상이 발생하기도 한다. 록업현상이 발생하면 스티어링 휠을 돌려도 조향이 안되며 차량이 통제불능 상태에 빠져버리는데, 이러한 문제를 방지하기 위해 바퀴가 잠기지 않도록 브레이크를 반복적으로 작동시켜 주는 시스템이 ABS이다.There is a difference between the load on the tire and the road surface when the vehicle is running. Under these conditions, sudden braking can result in a lock-up, in which the vehicle proceeds and only the wheels stop. If a lockup occurs, steering is not possible even if the steering wheel is turned, and the vehicle falls out of control. To prevent this problem, the system that repeatedly operates the brakes to prevent the wheels from locking up is ABS.

ABS는 휠의 속도를 감지하는 휠스피드 센서, 브레이크의 작동 상태를 감지하는 PTS(pedal travel switch), 유압조정장치인 HCU(Hydraulic control unit), 휠의 회전상태를 감지하여 브레이크 시스템의 부스터와 마스터실린더를 제어하는 ECU(electronic control unit) 등으로 구성된다.
ABS is a wheel speed sensor that senses the speed of the wheel, a PTS (pedal travel switch) that senses the operation of the brake, a hydraulic control unit (HCU), which senses the rotation of the wheel, and a booster and master of the brake system. ECU (electronic control unit) for controlling the cylinder.

이중, 종래의 휠스피드 센서 구조는 ECU와 통신하도록 구성되되 차축의 끝단에 연결되는 허브의 내측으로 펄스링(pulse ring)을 장착하고 상기 펄스링에 형성된 홈의 고저 차이를 감지함으로서 허브의 회전속도를 계측하도록 구성되었다.Among them, the conventional wheel speed sensor structure is configured to communicate with the ECU, but by mounting a pulse ring inside the hub connected to the end of the axle and detecting the height difference of the groove formed in the pulse ring, the rotation speed of the hub It was configured to measure.

도 1 을 참조하여 더 상세히 설명하면, 상기 펄스링(3)은 일측면에서 둘레를 따라 다수 개의 홈들(grooves)이 형성된 구조를 가지며, 상기 펄스링(3)과 인접해서는 센서(1)가 차체에 고정설치된다. 상기 센서(1)는 허브(2)와 함께 회전하는 펄스링(3)의 회전에 따라 변하는 전압 파형을 감지하며 ECU와 통신한다. Referring to FIG. 1, the pulse ring 3 has a structure in which a plurality of grooves are formed along a circumference of one side thereof, and the sensor 1 is adjacent to the pulse ring 3. Fixed to The sensor 1 detects a voltage waveform that changes with the rotation of the pulse ring 3 rotating with the hub 2 and communicates with the ECU.

즉, 펄스링(3)의 볼록한 부분(홈이 없는 부분)이 센서(1)에 근접할 때는 센서(1)에 유기되는 전압의 파형이 커지고 반대로 펄스링(3)의 홈 부분이 근접할 때는 전압의 파형이 작아지는 현상을 이용하여 휠스피드(허브의 회전속도)를 감지한다. That is, when the convex part (the grooveless part) of the pulse ring 3 approaches the sensor 1, the waveform of the voltage induced in the sensor 1 becomes large, and conversely, when the groove part of the pulse ring 3 is close. The wheel speed (hub rotation speed) is detected using the phenomenon that the waveform of the voltage decreases.

그러나, 이러한 센싱(sensing) 방식을 유지하기 위해서는 센서(1)와 펄스링(3) 사이에 에어갭(air gap)이 적절히 유지되어야 한다. 일반적으로 0.7mm 이하의 에어갭을 유지하여야 하며, 상기 에어갭이 기준치 이상으로 커지게 되면 센서(1)에 유기되는 전압이 규정치 보다 작아져 정확한 센싱을 할 수 없는 문제점이 발생하였다. However, in order to maintain this sensing method, an air gap must be properly maintained between the sensor 1 and the pulse ring 3. In general, an air gap of 0.7 mm or less should be maintained, and when the air gap becomes larger than a reference value, a voltage induced in the sensor 1 becomes smaller than a prescribed value, thereby causing a problem in that accurate sensing cannot be performed.

따라서, 펄스링을 이용한 휠스피드 센싱 방법에서는 에어갭의 유지가 매우 중요한 사항이나 펄스링의 가공불량, 센서 고정을 위한 부쉬의 이탈 등 다양한 원인으로 에어갭의 유지에 문제점이 발생하였다.Therefore, in the wheel speed sensing method using pulse ring, there is a problem in maintaining the air gap due to various reasons such as maintenance of the air gap is very important, poor processing of the pulse ring, departure of the bush for fixing the sensor.

본 발명은 상기와 같은 문제점을 해소한 휠스피드 센서 구조를 제공하는 것에 주목적이 있다.
The present invention is to provide a wheel speed sensor structure that solves the above problems.

상기와 같은 목적을 달성하기 위한 본 발명은, 차량의 차축에 연결된 휠허브의 회전속도를 감지하는 ABS용 휠스피드 센서 구조에 있어서, 상기 휠허브에는 일방향으로 빛을 조사(照射)하며 차축을 중심축으로 회전하도록 발광부가 장착되고, 상기 발광부에서 조사된 빛을 감지하는 수광부가 휠허브와 이격되어 차량에 고정설치되되, 상기 발광부의 회전시 조사된 빛이 수광부를 지나가도록 배치되어, 수광부가 빛을 감지한 횟수에 따라 휠허브의 회전속도를 계측하는 것을 특징으로 한다.The present invention for achieving the above object, in the ABS wheel speed sensor structure for detecting the rotational speed of the wheel hub connected to the axle of the vehicle, the wheel hub is irradiated with light in one direction (center) to the center of the axle A light emitting unit is mounted to rotate about an axis, and a light receiving unit that detects light emitted from the light emitting unit is spaced apart from the wheel hub and is fixed to the vehicle, and the light irradiated during rotation of the light emitting unit passes through the light receiving unit. The rotation speed of the wheel hub is measured according to the number of times light is detected.

상기 발광부는, 볼트 형상으로서 상측 중심에서 설치홈이 형성된 몸체부; 및 상기 설치홈에 안착되는 발광체;를 포함하여 이뤄진 것을 특징으로 한다.The light emitting unit has a bolt shape, the body portion formed with an installation groove in the upper center; And a light emitting body seated in the installation groove.

상기 발광체는 발광다이오드(LED) 및 상기 발광다이이오드에 전원을 공급하는 배터리를 내장하는 LED조립체로 구성되는 것이 바람직하며, 상기 LED조립체의 외주면에는 오링(o-ring)이 결합되고, 설치홈의 내주면에는 상기 오링이 끼움결합되는 고정홈이 형성된다.The light emitter is preferably composed of a light emitting diode (LED) and an LED assembly including a battery for supplying power to the light emitting diode, and an O-ring is coupled to an outer circumferential surface of the LED assembly, An inner circumferential surface is provided with a fixing groove to which the O-ring is fitted.

그리고, 상기 설치홈의 입구를 폐쇄하고 LED조립체의 전면에 위치하는 투명판이 몸체부에 결합된다.
Then, the inlet of the installation groove is closed and the transparent plate located on the front of the LED assembly is coupled to the body portion.

상기와 같은 구성의 본 발명은, 펄스링이 삭제되므로 원가절감 및 중량 감소를 도모할 수 있으며, 에어갭의 변화로 인한 휠 속도 계측 오류를 방지할 수 있는 효과가 있다.
According to the present invention having the above configuration, since the pulse ring is eliminated, cost reduction and weight reduction can be achieved, and the wheel speed measurement error due to the change in the air gap can be prevented.

도 1 은 종래의 휠스피드 센싱 방식을 도시한 정면도,
도 2 는 본 발명의 바람직한 실시예에 따른 발광부의 분해사시도,
도 3 은 본 발명의 바람직한 실시예에 따른 발광부의 사시도 및 A-A 단면도,
도 4 는 본 발명의 바람직한 실시예에 따른 발광부 및 수광부가 휠허브에 장착된 모습을 도시한 사시도.1 is a front view showing a conventional wheel speed sensing method,
2 is an exploded perspective view of a light emitting unit according to a preferred embodiment of the present invention;
3 is a perspective view and an AA cross-sectional view of a light emitting unit according to a preferred embodiment of the present invention;
4 is a perspective view illustrating a light emitting unit and a light receiving unit mounted on a wheel hub according to a preferred embodiment of the present invention.

이하, 도면을 참조하여 본 발명의 바람직한 실시예에 따른 ABS용 휠스피드 센서 구조를 더욱 상세히 설명한다.Hereinafter, a wheel speed sensor structure for an ABS according to a preferred embodiment of the present invention with reference to the drawings in more detail.

본 발명의 센서 구조는 빛을 일방향으로 조사하는 발광부와 상기 발광부에서 조사된 빛을 감지하며 ECU와 통신하는 수광부로 이뤄진다.The sensor structure of the present invention is composed of a light emitting unit for irradiating light in one direction and a light receiving unit for detecting light emitted from the light emitting unit and communicating with the ECU.

도 2 와 도 3 을 참조하면, 상기 발광부는 몸체부(10)와 발광체로 구성되되, 휠허브(40: 도 4 의 도면부호 참조)에 나사홀(screw hole)을 형성하여 결합될 수 있도록 몸체부(10)는 나사선(미도시)이 형성된 볼트 형상으로서 볼트의 머리부분에는 소정의 깊이로 설치홈(11)이 마련된다. 그리고, 상기 설치홈(11)의 내주면에는 세 개의 고정홈들(12a, 12b, 12c)이 나란히 형성된다. 2 and 3, the light emitting portion is composed of the body portion 10 and the light emitting body, the body to be coupled to form a screw hole (screw hole) in the wheel hub (40: reference numeral 4) The part 10 is a bolt shape in which a thread (not shown) is formed, and an installation groove 11 is provided at a predetermined depth in the head of the bolt. In addition, three fixing grooves 12a, 12b, and 12c are formed side by side on the inner circumferential surface of the installation groove 11.

한편, 본 발명의 발광체는 LED조립체(light emitting diodes assembly)(20)로 실시된다. 상기 LED조립체(20)는 설계 및 조립의 자유도를 향상하도록 발광다이오드 및 상기 발광다이오드에 전원을 공급하는 소형 배터리를 내장하는 구조로서 별도의 외부 전원이 필요치 않으며, 휠허브의 회전시 발생하는 충격 및 진동으로 보호될 수 있도록 외주면에 고무재질의 오링(o-ring)(21a, 21b)이 끼워진다. Meanwhile, the light emitter of the present invention is implemented as a light emitting diodes assembly 20. The LED assembly 20 has a structure in which a light emitting diode and a small battery for supplying power to the light emitting diode are built in order to improve the degree of freedom in design and assembly. Rubber-shaped o-rings 21a and 21b are fitted to the outer circumferential surface so as to be protected by vibration.

상기 오링(21a, 21b)은 원통형상으로 구성된 LED조립체(20)의 상측과 하측에 각각 끼워져, 상기 LED조립체(20)가 설치홈(11)에 안착됐을 때 LED조립체(20)를 외부충격으로부터 보호하며 위치를 고정시킨다. The O-rings 21a and 21b are fitted to the upper and lower sides of the LED assembly 20 having a cylindrical shape, and the LED assembly 20 is mounted from the external shock when the LED assembly 20 is seated in the installation groove 11. Protect and lock in position.

아울러, 빛을 조사하는 상기 LED조립체(20)의 표면에 이물질이 부착되지 않도록, 상기 LED조립체(20)가 안착된 뒤 삽입홈(11)의 최상측 고정홈(12c)에는 빛이 용이하게 투과하는 투명재질의 투명판(30)이 추가적으로 결합된다. In addition, light is easily transmitted through the top fixing groove 12c of the insertion groove 11 after the LED assembly 20 is seated so that no foreign matter is attached to the surface of the LED assembly 20 irradiating light. The transparent plate 30 of the transparent material is further coupled.

그리고, 상기 LED조립체(20)에서 조사된 빛을 수신하는 수광부(50)는 LED조립체(20)에 근접하여 차체의 소정의 위치에 고정설치된다. 상기 수광부(50)는 발광부와의 거리에 크게 제한받지 않고 빛의 수신여부만 감지하여 속도를 센싱하도록, 즉, 정해진 시간 동안 빛의 수광 횟수를 파악하여 휠허브의 회전수를 계측할 수 있도록 발광부의 회전시 항상 조사되는 빛이 수광부를 지나가게 위치된다. Then, the light receiving unit 50 for receiving the light irradiated from the LED assembly 20 is fixed to a predetermined position of the vehicle body in close proximity to the LED assembly 20. The light receiving unit 50 senses the speed by receiving only light without being limited to the distance from the light emitting unit, that is, to detect the number of light received for a predetermined time to measure the number of revolutions of the wheel hub The light irradiated at all times during the rotation of the light emitting unit is positioned to pass through the light receiving unit.

이와 같이 구성된 본 발명의 휠스피드 센서는, 도 4 에 도시된 바와 같이, 휠허브(40)에 장착된다. 상기 발광부는 휠허브의 회전속도를 더 정밀하게 계측할 수 있도록 다수 개가 장착될 수 있다. 그리고, 전술한 바와 같이 각 발광부에서 조사된 빛이 휠허브의 회전시 수신부를 지나갈 수 있도록 각 발광부는 회전축인 차축(미도시)에서 동일한 간격을 두고 배치된다. The wheel speed sensor of the present invention configured as described above is mounted to the wheel hub 40, as shown in FIG. A plurality of light emitting units may be mounted to more accurately measure the rotational speed of the wheel hub. As described above, the light emitting units are disposed at equal intervals on the axles (not shown), which are rotation axes, so that light emitted from each light emitting unit passes through the receiving unit when the wheel hub is rotated.

상기와 같은 구성의 본 발명은 펄스링과 센서 간의 에어갭을 유지할 필요가 없으므로 전술한 바와 같은 문제점들을 해결할 수 있으며, 통상적으로 널리 사용되는 볼트들을 LED조립체와 결합하여 발광부로 구성할 수 있으므로 훨씬 더 저렴하게 제작할 수 있는 효과가 있다. 참고적으로, 이와같은 광학 센싱 방식은 차속 감지, 엔진의 rpm 감지 등 다른 분야에도 적용될 수 있고, 부품공용화 및 조립공정 단순화에 따라 원가 절감 효과를 얻을 수 있다.The present invention of the above configuration can solve the problems as described above because there is no need to maintain the air gap between the pulse ring and the sensor, and can be configured as a light emitting unit by combining the commonly used bolts with the LED assembly much more Inexpensive to produce. For reference, such an optical sensing method may be applied to other fields such as vehicle speed detection and engine rpm detection, and cost reduction may be achieved by commonizing parts and simplifying the assembly process.

이상과 같이 본 명세서와 도면에 개시된 실시예들은 본 발명의 이해를 돕기 위해 특정 예를 제시한 것에 지나지 않으며, 본 발명의 범위를 제한하고자 하는 것은 아니다. 여기에 개시된 실시예들 이외에도 본 발명의 기술적 사상에 바탕을 둔 다른 변형예들이 실시 가능하다는 것은 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자에게 자명한 것이다.
As described above, the embodiments disclosed in the specification and the drawings are only presented as specific examples to aid the understanding of the present invention, and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

10 : 몸체부
20 : LED 조립체
30 : 투명판
40 : 휠허브
50 : 수광부10: body part
20: LED assembly
30: transparent plate
40: wheel hub
50: light receiver

Claims (5)

차량의 차축에 연결된 휠허브의 회전속도를 감지하는 ABS용 휠스피드 센서 구조에 있어서,
상기 휠허브에는 일방향으로 빛을 조사(照射)하며 차축을 중심축으로 회전하도록 발광부가 장착되고,
상기 발광부에서 조사된 빛을 감지하는 수광부가 휠허브와 이격되어 차량에 고정설치되되,
상기 발광부와 수광부는, 조사된 빛이 발광부의 회전시에 수광부를 지나가도록 배치된 것을 특징으로 하는 ABS용 휠스피드 센서 구조.
In the ABS wheel speed sensor structure for detecting the rotational speed of the wheel hub connected to the axle of the vehicle,
The wheel hub is equipped with a light emitting unit for irradiating light in one direction and rotating around the axle axis,
The light receiving unit for detecting the light emitted from the light emitting unit is fixed to the vehicle spaced apart from the wheel hub,
The light emitting unit and the light receiving unit, the wheel speed sensor structure for ABS, characterized in that the irradiated light is disposed so as to pass through the light receiving unit when rotating.
제 1 항에 있어서, 상기 발광부는,
볼트 형상으로서 상측 중심에서 설치홈이 형성된 몸체부; 및
상기 설치홈에 안착되는 발광체;를 포함하여 이뤄진 것을 특징으로 하는 ABS용 휠스피드 센서 구조.
The method of claim 1, wherein the light emitting unit,
A body portion having an installation groove formed in an upper center as a bolt shape; And
Wheel speed sensor structure for ABS, characterized in that made; including a light emitting body seated in the installation groove.
제 2 항에 있어서, 상기 발광체는 발광다이오드(LED) 및 상기 발광다이이오드에 전원을 공급하는 배터리를 내장하는 LED조립체인 것을 특징으로 하는 ABS용 휠스피드 센서 구조.
3. The wheel speed sensor structure of claim 2, wherein the light emitter is a light emitting diode (LED) and an LED assembly including a battery for supplying power to the light emitting diode.
제 2 항 또는 제 3 항에 있어서, 상기 LED조립체의 외주면에는 오링(o-ring)이 결합되고, 설치홈의 내주면에는 상기 오링이 끼움결합되는 고정홈이 형성된 것을 특징으로 하는 ABS용 휠스피드 센서 구조.
The wheel speed sensor for ABS according to claim 2 or 3, wherein an O-ring is coupled to an outer circumferential surface of the LED assembly, and a fixing groove is formed on the inner circumferential surface of an installation groove to which the O-ring is fitted. rescue.
제 4 항에 있어서, 상기 설치홈의 입구를 폐쇄하고 LED조립체의 전면에 위치하는 투명판이 몸체부에 결합된 것을 특징으로 하는 ABS용 휠스피드 센서 구조. The wheel speed sensor structure for ABS according to claim 4, wherein the transparent plate positioned at the front of the LED assembly and closing the inlet of the installation groove is coupled to the body part.
KR1020100062124A 2010-06-29 2010-06-29 Structure of wheel speed sensor for anti-lock brake system KR20120001376A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104117216A (en) * 2013-11-12 2014-10-29 成都科创佳思科技有限公司 Computer simulation control type hurdle
CN108535510A (en) * 2018-05-29 2018-09-14 安徽大明汽车零部件有限公司 A kind of wheel hub monitoring rotating speed

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104117216A (en) * 2013-11-12 2014-10-29 成都科创佳思科技有限公司 Computer simulation control type hurdle
CN108535510A (en) * 2018-05-29 2018-09-14 安徽大明汽车零部件有限公司 A kind of wheel hub monitoring rotating speed

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