KR100254343B1 - Anti-lock brake system - Google Patents
Anti-lock brake system Download PDFInfo
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- KR100254343B1 KR100254343B1 KR1019960054305A KR19960054305A KR100254343B1 KR 100254343 B1 KR100254343 B1 KR 100254343B1 KR 1019960054305 A KR1019960054305 A KR 1019960054305A KR 19960054305 A KR19960054305 A KR 19960054305A KR 100254343 B1 KR100254343 B1 KR 100254343B1
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- wheel speed
- wheel
- light
- brake system
- speed sensing
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- 238000001514 detection method Methods 0.000 claims abstract description 9
- 238000010586 diagram Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000004804 winding Methods 0.000 description 4
- 230000005674 electromagnetic induction Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 1
Classifications
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- 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
- B60T8/321—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 deceleration
- B60T8/329—Systems characterised by their speed sensor arrangements
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- 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
- B60T8/17—Using electrical or electronic regulation means to control braking
- B60T8/176—Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS
- B60T8/1761—Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS responsive to wheel or brake dynamics, e.g. wheel slip, wheel acceleration or rate of change of brake fluid pressure
- B60T8/17613—Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS responsive to wheel or brake dynamics, e.g. wheel slip, wheel acceleration or rate of change of brake fluid pressure based on analogue circuits or digital circuits comprised of discrete electronic elements
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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
- G01P3/64—Devices characterised by the determination of the time taken to traverse a fixed distance
- G01P3/68—Devices characterised by the determination of the time taken to traverse a fixed distance using optical means, i.e. using infrared, visible, or ultraviolet light
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- 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
- B60Y2400/3032—Wheel speed sensors
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- 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
- B60Y2400/81—Braking systems
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Regulating Braking Force (AREA)
Abstract
본 발명은 안티록 브레이크 시스템의 휠속도감지장치에 관한 것으로서, 특히, 휠허브어셈블리의 소정위치에 일정간격에 따라 원주방향으로 부설되는 복수의 반사부재 및, 상기 복수의 반사부재가 부설되는 상기 휠허브어셈블리의 표면에 빛을 조사하는 한편, 상기 반사부재에서 반사되는 빛을 수광하여, 상기 빛이 수광되는 주기에 따라 그에 상응하는 주파수의 휠속도감지신호를 발생시키는 휠속도센서로 구성되는 것을 특징으로 하는 안티록 브레이크 시스템의 휠속도감지장치를 제공하여, 휠속도감지신호의 주파수를 높일 수 있다.The present invention relates to a wheel speed sensing apparatus for an anti-lock brake system, and more particularly, to a wheel speed sensing apparatus for an anti-lock brake system having a plurality of reflective members laid in a circumferential direction at predetermined intervals in a predetermined position of a wheel hub assembly, And a wheel speed sensor for emitting light to the surface of the hub assembly and receiving light reflected from the reflection member and generating a wheel speed sensing signal having a frequency corresponding to the light receiving period, The wheel speed detection device of the anti-lock brake system is provided, so that the frequency of the wheel speed detection signal can be increased.
Description
본 발명은 자동차의 안티록 브레이크 시스템에 관한 것으로서, 보다 상세하게는, 휠속도감지신호의 주파수를 높이는 데에 적합한 안티록 브레이크 시스템의 휠속도감지 장치에 관한 것이다.The present invention relates to an anti-lock brake system of an automobile, and more particularly, to a wheel speed sensing apparatus of an anti-lock brake system suitable for increasing the frequency of a wheel speed sensing signal.
일반적으로, 제동장치는 주행하는 자동차를 감속 또는 정지시킴과 동시에 주차상태를 유지하기 위하여 사용하는 중요한 장치로서, 마찰력을 이용하여 자동차의 운동에너지를 열에너지로 변환한 후, 대기 속으로 방출시켜 제동을 하는 마찰식 브레이크를 주로 사용하고 있다.In general, a braking device is an important device used for decelerating or stopping a traveling vehicle and maintaining a parking state. It converts kinetic energy of a vehicle into thermal energy using frictional force, Friction brake is mainly used.
그러나, 상기 일반적인 브레이크는 바퀴의 정지시 노면과의 마찰력이 대폭 감소하여 미끄러지게 되고, 직진성을 잃어버리게 된다. 그러므로, 이에 대한 대처 방안으로 안티록 브레이크 시스템(Anti-Lock Brake System; 이하, 'ABS'라 약칭함)이 개발되어 널리 보급되고 있는 실정이다.However, when the wheel is stopped, the friction force between the brake and the road surface is greatly reduced, and the conventional brake slips and loses straightness. Therefore, an anti-lock brake system (hereinafter abbreviated as ABS) has been developed and widely used as a countermeasure thereto.
종래 ABS는 제동시에 각 바퀴와 노면과의 마찰계수의 변화에 따라서 전자적으로 각 바퀴의 유압을 조절하여 휠을 제동하는 장치로서, 빙판길에서도 미끄러짐을 방지하여 차량의 직진안정성과 조향안전성을 유지시킴과 동시에 제동거리를 단축하는 장치이다.Conventionally, ABS is a device that brakes the wheel by electronically controlling the hydraulic pressure of each wheel in accordance with the change of coefficient of friction between each wheel and the road surface at the time of braking. It prevents the slip on the ice road and maintains the straight stability and steering stability of the vehicle. And shorten the braking distance.
제1도는 일반적인 안티록 브레이크 시스템의 개략적인 블록구성도로서, 휠속도센서(10)는 자동차의 각각의 휠에 대한 속도를 감지하고, 그에 상응하는 전기적인 휠속도감지신호로 변환하여, 전자제어유닛(20)에 인가한다.1 is a schematic block diagram of a general anti-lock brake system, in which a wheel speed sensor 10 senses the speed for each wheel of an automobile and converts it to a corresponding electronic wheel speed sensing signal, Unit 20 as shown in Fig.
전자제어유닛(20)은 상기 휠속도센서(10)에서 출력되는 휠속도감지신호에 따라 그에 상응하는 유압조절제어신호를 모듈레이터(30)에 인가하며, 모듈레이터(30)는 상기 유압조절제어신호에 따라 각각의 휠브레이크(40)에 전달되는 유압을 조절함으로써, 휠을 제동하게 된다.The electronic control unit 20 applies a corresponding hydraulic pressure control signal to the modulator 30 according to the wheel speed sensing signal output from the wheel speed sensor 10 and the modulator 30 outputs the hydraulic pressure control signal By controlling the hydraulic pressure delivered to each wheel brake 40, the wheel is braked.
한편, 상기 휠속도센서(10)의 내부구성은 제2도에 도시된 바와 같으며, 휠속도센서(10)는, 도시생략된 톤휠의 요부(凹部) 및 철부(凸部)와의 전자유도효과에 의해 유기기전력을 발생시키는 기전력발생부(11)와, 상기 기전력발생부(11)에서 발생된 유기기전력의 아날로그적인 변화를 디지탈형태의 휠속도감지신호로 변환하는 신호처리부(12)로 구성된다.The wheel speed sensor 10 has an internal configuration as shown in FIG. 2. The wheel speed sensor 10 has an electromagnetic induction effect with a concave portion and a convex portion of a tone wheel And a signal processing unit 12 for converting an analog change of the organic electromotive force generated in the electromotive force generating unit 11 into a wheel speed sensing signal in a digital form. The electromotive force generating unit 11 generates an electromotive force .
상기 휠속도센서(10)는 제3도에 도시된 바와 같이, 휠의 내측면에 부설되고, 제4도에 도시된 바와 같이, 톤휠(13)의 상부에 일정한 간격으로 이격되어 장착된 구조를 가진다.The wheel speed sensor 10 is attached to the inner surface of the wheel as shown in FIG. 3, and is mounted on the top of the ton wheel 13 at a predetermined interval, as shown in FIG. 4 I have.
따라서, 제5도에 도시된 바와 같이, 휠속도센서(10)내에 구비된 기전력발생부(11)의 1차권선(11-a)에 소정레벨의 전압을 인가하면, 기전력발생부(11)는 그 종단(11-c)이 톤휠(13)의 철부(凸部)(A~B)와 일직선상으로 위치할 때 상기 철부(凸部)(A∼B)의 금속면과의 소용돌이 전류효과에 의한 전자유도작용으로 2차권선(11-b)에 소정의 유기기전력(e)이 발생된다.5, when a voltage of a predetermined level is applied to the primary winding 11-a of the electromotive force generating section 11 provided in the wheel speed sensor 10, the electromotive force generating section 11 generates the electromotive force, When the terminal 11-c thereof is positioned in a straight line with the convex portions A to B of the ton wheel 13, the vortex current effect with the metal surface of the convex portions A to B A predetermined organic electromotive force e is generated in the secondary winding 11-b.
한편, 기전력발생부(11)는 그 종단(11-c)이 톤휠(13)의 요부(凹部)(B∼A)와 일직선상으로 위치할 때는, 상기 요부(凹部)(B∼A)의 금속면과 기전력발생부(11)의 종단(11-c)과의 간격(ℓ)이 상기 소용돌이 전류효과가 발생되기 어려운 정도의 큰 간격이기 때문에, 2차권선(11-b)에는 전자유도작용에 의한 유기기전력(e)이 발생되지 않는 것이다.On the other hand, when the terminal end 11-c of the electromotive force generating portion 11 is located in a straight line with the concave portions B to A of the tone wheel 13, Since the interval l between the metal surface and the end 11-c of the electromotive force generating portion 11 is large enough to prevent the spiral current effect from occurring, the secondary winding 11- The organic electromotive force " e "
즉, 휠의 회전에 의해 톤휠(13)이 회전되어, 상기 기전력발생부(11)의 하부에 톤휠(13)의 철부(凸部)(A∼B)가 위치하면 유기기전력(e)이 발생되고, 상기 기전력발생부(11)의 하부에 톤휠(13)의 요부(凹部)(B∼A)가 위치하면 유기기전력(e)이 발생되지 않는 것이다.That is, when the tonewheel 13 is rotated by the rotation of the wheel and the convex portions A to B of the ton wheel 13 are positioned below the electromotive force generating portion 11, an organic electromotive force e is generated And the organic electromotive force e is not generated when the concave portions B to A of the ton wheel 13 are positioned below the electromotive force generating portion 11.
신호처리부(12)에서 상기 유기기전력(e)의 변화를 디지털형태로 신호처리하면, 제6도의 (a) 내지 (c)에 도시된 바와 같은 파형이 발생되는 데, 신호처리부(12)에서 출력되는 디지털형태의 휠속도감지신호의 전압레벨이 하이레벨(H)인 반주기동안(tH, tM, tL)이 톤휠(13)의 철부(凸部)(A∼B)가 기전력발생부(11)의 종단(11-c)에 위치하는 시간이고, 신호처리부(12)에서 출력되는 디지털형태의 휠속도감지신호의 전압레벨이 로우레벨(L)인 반주기동안(tH, tM, tL)이 톤휠(13)의 요부(凹部)(B∼A)가 기전력발생부(11)의 종단(11-c)에 위치하는 시간인 것이다.When the signal processing unit 12 processes the change of the organic electromotive force e in a digital form, a waveform as shown in (a) to (c) of FIG. 6 is generated. In the signal processing unit 12, (Convex portions) A to B of the ton wheel 13 during the half period (tH, tM, tL) in which the voltage level of the digital wheel speed sensing signal is high level (H) (TH, tM, tL) during which the voltage level of the digital wheel speed detection signal output from the signal processing unit 12 is at the low level (L) The concave portions B to A of the electrodes 13 are located at the end 11-c of the electromotive force generating portion 11.
따라서, 전자제어유닛(20)은 상기 디지털형태를 갖는 휠속도감지신호의 주파수에 의해 휠속도를 감지하게 되는 것이다.Accordingly, the electronic control unit 20 senses the wheel speed by the frequency of the wheel speed sensing signal having the digital form.
상기한 바와 같이, 휠속도에 따라 상기 휠속도감지신호의 주파수가 달라지게 되기 때문에, 휠의 속도가 고속일 때는, 상기 휠속도감지신호가, 제6도의 (a)에 도시된 바와 같은 고주파수를 갖게 되고, 휠의 속도가 중속일 때는, 제6도의 (b)에 도시된 바와 같은 중간주파수를 갖게 되며, 휠의 속도가 저속일 때는 제6도의 (c)에 도시된 바와 같은 저주파수를 갖게 된다.As described above, since the frequency of the wheel speed sensing signal changes according to the wheel speed, when the wheel speed is high, the wheel speed sensing signal has a high frequency as shown in (a) of FIG. 6 When the speed of the wheel is medium speed, it has the intermediate frequency as shown in (b) of FIG. 6, and when the speed of the wheel is low, it has the low frequency as shown in (c) of FIG. 6 .
한편, 전자제어유닛(20)이 휠의 속도를 판단하기 위해서는, 상기 휠속도감지신호의 주파수를 검출해야 하는 데, 휠의 속도가 저속일 때, 제6도의 (c)에 도시된 바와 같이 저주파수에 의해 파형의 주기가 지나치게 길어지면, 전자제어유닛(20)이 휠의 속도에 대해 판단하는 시간이 길어지게 된다.On the other hand, in order for the electronic control unit 20 to determine the wheel speed, it is necessary to detect the frequency of the wheel speed sensing signal. When the wheel speed is low, as shown in (c) The period for which the electronic control unit 20 determines the speed of the wheel becomes longer.
상기한 바와 같이, 전자제어유닛(20)의 휠의 속도에 대한 판단시간이 길어지게 되면, 전자제어유닛(20)의 모듈레이터(30)에 대한 제어신호의 출력이 신속하게 이루어지지 못하기 때문에, 모듈레이터(30)가 시기적절하게 휠브레이크(40)의 유압을 조절할 수 없게 된다.As described above, since the output of the control signal to the modulator 30 of the electronic control unit 20 can not be performed quickly if the determination time for the speed of the wheel of the electronic control unit 20 becomes long, The modulator 30 can not adjust the hydraulic pressure of the wheel brake 40 in a timely manner.
즉, 종래의 ABS는 저속에서, 그 제동성능이 떨어지는 단점이 있었던 것이다.That is, the conventional ABS has a disadvantage that its braking performance deteriorates at low speed.
상기한 바와 같은 종래의 ABS의 단점을 해소하기 위해서는, 상기 휠속도감지신호의 주파수를 높게 설정하여야 하는 데, 종래의 ABS에 구비된 휠속도센서(10)에서 출력되는 휠속도감지신호의 주파수가 톤휠(13)의 이수비에 비례하기 때문에, 상기 휠속도감지신호의 주파수를 높이기 위해서는 톤휠(13)의 이수비를 늘려야 한다.In order to overcome the disadvantages of the conventional ABS as described above, the frequency of the wheel speed sensing signal must be set high, and the frequency of the wheel speed sensing signal output from the wheel speed sensor 10 provided in the conventional ABS It is necessary to increase the duty ratio of the ton wheel 13 in order to increase the frequency of the wheel speed sensing signal.
그러나, 상기 기전력발생부(11)는 금속면과의 소용돌이 전류효과에 의한 전자유도작용으로 2차권선(11-b)에 소정의 유기기전력(e)을 발생시키기 때문에, 톤휠(13)의 이수비를 적정한 범위이상으로 늘리게 되면, 간격이 좁혀진 철부(凸部)들의 상호간에 전자유도적인 간섭작용이 발생되어, 상기 휠속도감지신호의 주파수가 휠의 속도와 정확하게 일치하지 않는 문제점이 발생된다.However, since the electromotive force generating section 11 generates the predetermined organic electromotive force e in the secondary winding 11-b by the electromagnetic induction action by the effect of the swirl current with the metal surface, An electromagnetic induction interference effect is generated between the convex portions whose intervals are narrowed to cause a problem that the frequency of the wheel speed sensing signal does not exactly coincide with the wheel speed.
또한, 톤휠(13)은 기계적인 가공에 의해 형성되는 것이기 때문에, 그 이수비를 늘리는 데에 한계를 갖는 문제점이 있었다.Further, since the toning wheel 13 is formed by mechanical processing, there is a problem in that it has a limit to increase the finishing ratio.
따라서, 본 발명은 상기와 같은 문제점을 해결하기 위해 안출된 것으로서, 본 발명은 휠속도감지신호의 주파수를 높일 수 있는 안티록 브레이크 시스템의 휠속도감지장치를 제공하는 데에 그 목적이 있다.SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a wheel speed sensing apparatus for an anti-lock brake system capable of increasing the frequency of a wheel speed sensing signal.
상기 목적을 달성하기 위한 본 발명에 따른 안티록 브레이크 시스템의 휠속도감지장치는, 휠허브어셈블리의 소정위치에 일정간격에 따라 원주방향으로 부설되는 복수의 반사부재 및, 상기 복수의 반사부재가 부설되는 상기 휠허브어셈블리의 표면에 빛을 조사하는 한편, 상기 반사부재에서 반사되는 빛을 수광하여, 상기 빛이 수광되는 주기에 따라 그에 상응하는 주파수의 휠속도감지신호를 발생시키는 휠속도센서로 구성되는 것을 특징으로 한다.According to an aspect of the present invention, there is provided an apparatus for sensing a wheel speed of an anti-lock brake system, comprising: a plurality of reflection members arranged in a circumferential direction at regular intervals in predetermined positions of a wheel hub assembly; And a wheel speed sensor for emitting light to the surface of the wheel hub assembly and receiving light reflected from the reflection member and generating a wheel speed sensing signal of a frequency corresponding to the light receiving period .
제1도는 일반적인 안티록 브레이크 시스템의 개략적인 블록구성도.FIG. 1 is a schematic block diagram of a general anti-lock brake system. FIG.
제2도는 제1도에 도시된 휠속도센서의 내부블록구성도.Fig. 2 is an internal block diagram of the wheel speed sensor shown in Fig. 1. Fig.
제3도는 종래의 휠속도감지장치에 대한 도면.FIG. 3 is a view of a conventional wheel speed sensing device. FIG.
제4도는 종래의 휠속도감지장치의 체결구조를 도시한 도면.FIG. 4 is a view showing a fastening structure of a conventional wheel speed sensing device. FIG.
제5도는 종래의 췰속도감지장치의 동작상태를 설명하기 위한 도면.FIG. 5 is a view for explaining an operation state of a conventional speed sensing device. FIG.
제6(a)도 내지 (c)는 휠속도에 따른 휠속도감지신호의 파형주기를 나타낸 그래프.6 (a) to 6 (c) are graphs showing the waveform period of the wheel speed sensing signal according to the wheel speed.
제7도는 본 발명에 의한 휠속도감지장치의 개략적인 블록구성도.FIG. 7 is a schematic block diagram of a wheel speed sensing device according to the present invention; FIG.
제8도는 제7도에 도시된 휠속도센서의 내부블록구성도.Fig. 8 is an internal block diagram of the wheel speed sensor shown in Fig. 7; Fig.
제9도는 제7도에 도시된 반사부재의 부설위치를 도시한 도면.Fig. 9 is a view showing the laying position of the reflecting member shown in Fig. 7; Fig.
제10도는 본 발명에 의한 휠속도감지장치의 작용상태를 도시한 도면.FIG. 10 is a view showing an operating state of the wheel speed sensing device according to the present invention; FIG.
제11도는 종래의 휠속도감지장치 및 본 발명에 의한 휠속도감지장치에서 출력되는 휠속도감지신호를 도시한 도면.FIG. 11 is a view showing a wheel speed sensing signal output from a conventional wheel speed sensing device and a wheel speed sensing device according to the present invention; FIG.
* 도면의 주요부분에 대한 부호의 설명DESCRIPTION OF THE REFERENCE NUMERALS
10, 60 : 휠속도센서 11 : 기전력발생부10, 60: wheel speed sensor 11: electromotive force generating unit
12, 63 : 신호처리부 13 : 톤휠12, 63: Signal processing section 13: Toner wheel
20 : 전자제어유닛 30 : 모듈레이터20: electronic control unit 30: modulator
40 : 휠브레이크 50 : 반사부재40: wheel brake 50: reflective member
61 : 발광부 62 : 수광부61: light emitting portion 62: light receiving portion
이하, 첨부도면에 의거하여 본 발명에 의한 안티록 브레이크 시스템의 휠속도감지장치에 관한 바람직한 실시예를 상세히 설명하기로 한다.DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of a wheel speed sensing apparatus for an anti-lock brake system according to the present invention will be described in detail with reference to the accompanying drawings.
제7도는 본 발명에 의한 휠속도감지장치의 개략적인 블록구성도로서, 빛을 반사하는 반사부재(50)와, 상기 반사부재(50)에 빛을 조사하고, 여기서 반사된 빛의 수광주기에 따라 그에 상응하는 주파수를 갖는 디지털형태의 휠속도감지신호로 변환하여, 전자제어유닛에 인가하는 휠속도센서(60)로 구성된다.FIG. 7 is a schematic block diagram of a wheel speed sensing apparatus according to the present invention. FIG. 7 is a schematic block diagram of a wheel speed sensing apparatus according to the present invention, which includes a reflection member 50 for reflecting light, And a wheel speed sensor 60 for converting the wheel speed detection signal into a digital wheel speed detection signal having a frequency corresponding thereto and applying it to the electronic control unit.
한편, 제8도를 참조하면 알 수 있듯이, 상기 휠속도센서(60)는 빛을 발생시켜 상기 반사부재(50)를 향해 조사하는 발광부(61)와, 반사부재(50)에서 반사되는 빛을 수광하는 수광부(62) 및, 수광부(62)에서 수광되는 빛의 수광주기에 따라 그에 상응하는 주파수를 갖는 디지털형태의 휠속도감지신호로 변환하여, 전자제어유닛에 출력하는 신호처리부(63)로 구성된다.8, the wheel speed sensor 60 includes a light emitting unit 61 that generates light and irradiates the light toward the reflecting member 50, a light emitting unit 61 that reflects light reflected from the reflecting member 50, And a signal processing unit 63 for converting the received signal into a digital wheel speed detection signal having a frequency corresponding to the light receiving period of the light received by the light receiving unit 62 and outputting it to the electronic control unit, .
여기서, 반사부재(50)는, 제9도에 도시된 바와 같이, 휠허브어셈블리의 내측면에 복수개가 원주방향으로 부설되는 데, 제10도를 참조하면 알 수 있듯이, 수광하기에 적절한 간격(ℓ-b)을 사이로 하여 장착된 휠속도센서(60)의 발광부(61)가 반사부재(50)에 빛을 조사한 후, 수광부(62)가 이 반사부재(50)에서 반사된 빛을 수광하게 된다.As shown in FIG. 9, a plurality of reflection members 50 are circumferentially laid on the inner surface of the wheel hub assembly as shown in FIG. 9. As can be seen from FIG. 10, the light receiving portion 62 irradiates the light reflected by the reflecting member 50 after the light emitting portion 61 of the wheel speed sensor 60 mounted with the light receiving portion 62a and the light receiving portion 62b interposed therebetween irradiates the reflecting member 50 with light, .
반사부재(50)와, 반사부재(50)가 부설되지 않은 휠허브어셈블리의 표면과는 빛의 반사율에서 차이가 나게 되며, 이에 따라 수광부(62)는 반사부재(50)에서 반사되는 빛만을 하이레벨의 신호로 인식하게 된다.The reflector 50 and the surface of the wheel hub assembly where the reflector 50 is not laid out differ in the reflectance of light so that the light receiver 62 only reflects light reflected from the reflector 50 Level signal.
이로서, 수광부(62)는 상기 반사부재(50)에서 반사되는 빛의 수광주기에 따라 그에 상응하는 주파수를 갖는 아날로그형태의 휠속도감지신호를 출력하고, 신호처리부(63)는 상기 아날로그형태의 휠속도감지신호를 디지털형태의 휠속도감지신호로 변환하게 된다.The light receiving unit 62 outputs an analog wheel speed sensing signal having a frequency corresponding to the light receiving period of the light reflected by the reflecting member 50. The signal processing unit 63 receives the analog wheel speed sensing signal, The speed sensing signal is converted into a digital wheel speed sensing signal.
여기서, 수광부(62)는 상기 반사부재(50)에서 반사되는 빛을 수광하여, 이 빛의 수광주기에 상응하는 주파수의 휠속도감지신호를 발생시키기 때문에, 반사부재(50)와 반사부재(50)가 부설되지 않는 휠허브어셈블리는 반사되는 빛의 양에 의해 확연하게 구분됨으로써, 상기 반사부재(50)의 크기를 작게 하고, 그 간격을 좁게 하여도, 휠의 회전속도와 휠속도감지신호는 항상 일치하게 된다.Since the light receiving unit 62 receives the light reflected by the reflecting member 50 and generates the wheel speed detecting signal having the frequency corresponding to the light receiving period of the light, the reflecting member 50 and the reflecting member 50 The wheel hub assembly is clearly distinguished by the amount of reflected light so that even if the size of the reflective member 50 is reduced and the interval is narrowed, It always coincides.
따라서, 제11도에 도시된 바와 같이, 본 발명의 휠속도감지장치에서 출력되는 횔속도감지신호의 주파수(제11도의 (b) 참조)를 종래의 ABS에 구비된 휠센서(제1도의 10)에서 출력되는 휠속도감지신호의 주파수(제11도의 (a) 참조)보다 높게 하는 것이 가능하게 되는 것이다.Therefore, as shown in FIG. 11, the frequency (see FIG. 11 (b) of the speed sensing signal output from the wheel speed sensing device of the present invention) (Refer to FIG. 11 (a)) of the wheel speed detection signal output from the wheel speed detection signal outputting means.
전술한 바와 같이 본 발명의 안티록 브레이크 시스템의 휠속도감지장치에 의하면, 휠속도감지신호의 주파수를 높일 수 있는 효과가 있다.As described above, according to the wheel speed sensing apparatus of the anti-lock brake system of the present invention, the frequency of the wheel speed sensing signal can be increased.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019960054305A KR100254343B1 (en) | 1996-11-15 | 1996-11-15 | Anti-lock brake system |
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| Application Number | Priority Date | Filing Date | Title |
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| KR1019960054305A KR100254343B1 (en) | 1996-11-15 | 1996-11-15 | Anti-lock brake system |
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| KR19980035860A KR19980035860A (en) | 1998-08-05 |
| KR100254343B1 true KR100254343B1 (en) | 2000-06-01 |
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| KR1019960054305A Expired - Fee Related KR100254343B1 (en) | 1996-11-15 | 1996-11-15 | Anti-lock brake system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101756552B1 (en) * | 2015-12-10 | 2017-07-11 | 현대오트론 주식회사 | Apparatus for generating status information of tire |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995001549A1 (en) * | 1993-06-29 | 1995-01-12 | Omron Corporation | Road-surface examining device and device using it |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995001549A1 (en) * | 1993-06-29 | 1995-01-12 | Omron Corporation | Road-surface examining device and device using it |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101756552B1 (en) * | 2015-12-10 | 2017-07-11 | 현대오트론 주식회사 | Apparatus for generating status information of tire |
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