KR20120025698A - Method of and apparatus for measuring speed of vehicle - Google Patents

Method of and apparatus for measuring speed of vehicle Download PDF

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Publication number
KR20120025698A
KR20120025698A KR1020100087748A KR20100087748A KR20120025698A KR 20120025698 A KR20120025698 A KR 20120025698A KR 1020100087748 A KR1020100087748 A KR 1020100087748A KR 20100087748 A KR20100087748 A KR 20100087748A KR 20120025698 A KR20120025698 A KR 20120025698A
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KR
South Korea
Prior art keywords
wheel
speed
vehicle
pulse signal
tone wheel
Prior art date
Application number
KR1020100087748A
Other languages
Korean (ko)
Inventor
김학범
Original Assignee
주식회사 만도
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Publication date
Application filed by 주식회사 만도 filed Critical 주식회사 만도
Priority to KR1020100087748A priority Critical patent/KR20120025698A/en
Publication of KR20120025698A publication Critical patent/KR20120025698A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
    • B60C23/02—Signalling devices actuated by tyre pressure
    • B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
    • 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
    • G01D5/32—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 with attenuation or whole or partial obturation of beams of light
    • G01D5/34—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 with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • 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
    • G01P3/42—Devices characterised by the use of electric or magnetic means
    • G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
    • G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
    • G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
    • G01P3/486—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals delivered by photo-electric detectors
    • 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
    • G01P3/42—Devices characterised by the use of electric or magnetic means
    • G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
    • G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
    • G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
    • G01P3/489—Digital circuits therefor

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Regulating Braking Force (AREA)

Abstract

PURPOSE: A method and an apparatus for measuring vehicle speed are provided to enable the accurate measurement of vehicle speed. CONSTITUTION: A tone wheel(70) provides pulse signal generated from a tone wheel sensor(20) to a controller(302). The controller measures the rotation speed of a wheel from the pulse signal. The controller creates the control signal for controlling a vehicle stability maintaining unit(304) through the wheel speed information and controls the vehicle stability maintaining unit with the control signals.

Description

Vehicle speed measuring method and apparatus {METHOD OF AND APPARATUS FOR MEASURING SPEED OF VEHICLE}

The present invention relates to a method for measuring a vehicle speed, and more particularly, to a method for measuring a speed of a vehicle by detecting a rotation speed of a tone wheel mounted on a wheel.

As a method of measuring the speed of a driving vehicle, the speed of the vehicle is measured through a period of a pulse signal generated when the tone wheel rotated together with the wheel and mounted on the wheel of the vehicle.

The tone wheel drills a plurality of teeth or holes in a circular plate or cylindrical shape, and passes light therethrough to generate pulses through the difference between when light passes and when it does not pass. In the case of a vehicle, this pulse signal measures the rotational speed of the wheel, that is, the speed of the vehicle.

The number of teeth or holes formed in the tone wheel should ideally be equally spaced from each other, but the spacing may not be constant due to errors in manufacturing or damage during use, in which case the speed measurement results Errors may occur.

An object of the present invention is to reduce the measurement deviation caused by the error of the tone wheel when measuring the vehicle speed to more accurately measure the vehicle speed.

A vehicle speed measuring method according to the present invention for this purpose comprises: receiving a pulse signal from a tone wheel sensor mounted on a wheel and calculating the rotational speed of the wheel using the number of pulses for at least two periods of the pulse signal; The speed of the vehicle is measured based on the rotation speed of the wheel.

In addition, the above-mentioned speed calculation of the wheel

Figure pat00001
Is calculated as

According to an aspect of the present invention, there is provided a vehicle speed measuring apparatus comprising: a tone wheel mounted to a wheel and rotating together with the wheel; A tone wheel sensor for generating a pulse signal by reflecting the rotational speed of the tone wheel; And a control unit for receiving the pulse signal to calculate the rotational speed of the wheel using the number of pulses for at least two periods of the pulse signal, and for measuring the speed of the vehicle based on the rotational speed of the wheel.

In addition, the above-mentioned speed calculation of the wheel

Figure pat00002
Is calculated as

The present invention can reduce the measurement deviation due to the error of the tone wheel when measuring the vehicle speed to more accurately measure the vehicle speed.

1 is a view showing an example of the use of the tone wheel in a vehicle according to an embodiment of the present invention.
FIG. 2 is a perspective view of the tone wheel shown in FIG. 1. FIG.
3 is a block diagram illustrating a control system of a vehicle according to an exemplary embodiment.
4 is a view showing a tone wheel clock signal generated by the rotation of the tone wheel of FIG.

1 is a view showing an example of the use of the tone wheel in a vehicle according to an embodiment of the present invention, showing a tone wheel 70 mounted to the hub (1) of the wheel to measure the rotational speed of the wheel, The tone wheel 70 is in a state of being pressed into the hub 1 of the wheel. Reference numeral 20 is a tone wheel sensor.

FIG. 2 is a perspective view of the tone wheel shown in FIG. 1. FIG. As shown in FIG. 2, a cylindrical shaft diameter portion 71, which is a portion to be fitted to the hub 1, and a plurality of sensing holes 73 are formed at equal intervals along the circumferential direction to form irregularities. And a connecting portion 77 for connecting the shaft diameter portion 71 and the sensing portion 75, the shape of which has a multi-stage cylindrical shape. The tone wheel sensor 20 shown in FIG. 1 is mounted around the tone wheel 70. The tone wheel sensor 20 senses the sensing unit 75 when the tone wheel 70 rotates together with the wheel. A pulse signal generated by the hole 73 structure is generated. In the vehicle-mounted control device (controller), it is possible to grasp the rotational speed of the wheel in real time by analyzing the pulse signal generated by the tone wheel sensor 20. The tone wheel 70 and the tone wheel sensor 20 are used as essential components such as an anti-lock brake system (ABS), a transaction control system (TCS) or a vehicle dynamic control system (VDC) together with a control device. Therefore, the tone wheel 70 should be able to accurately grasp the rotational speed of a rotating body such as a wheel in real time, and for this purpose, the sensing unit 75, which is a part detected by the tone wheel sensor 20, should have a very precise flatness. At the same time, the uniform cross-sectional thickness must be maintained, and the uniformity of the shape and spacing of the sensing holes 73 must be very high.

3 is a block diagram illustrating a control system of a vehicle according to an exemplary embodiment. As shown in FIG. 3, the pulse signal generated by the tone wheel sensor 20 by the action of the tone wheel 70 is provided to the control unit ECU 302. The control unit 302 measures the rotational speed of the wheel (that is, the speed of the vehicle) from this pulse signal. The controller 302 measures the rotational speed of the wheel based on how many pulses have been generated during a predetermined time. The more pulses generated during the predetermined time, the faster the rotational speed of the wheel is. The less, the slower the wheels rotate. The controller 302 generates a control signal for controlling the vehicle stability maintaining device 304 such as ABS / TCS / VDC based on the wheel speed information, and the vehicle stability maintaining device 304 appropriately generates the control signal. It is controlled to ensure the stability of the vehicle. Therefore, accurate measurement of the wheel speed is required for the correct control of the vehicle stability maintaining device 304.

4 is a diagram illustrating a tone wheel clock signal generated by the rotation of the tone wheel of FIG. 3. As shown in FIG. 4, when the shape of the tone wheel 70 is ideal, that is, when the intervals and sizes of the sensing holes 73 of the tone wheel 70 are all uniform, pulse signals generated by the tone wheel sensor 20 are generated. Has a uniform period. However, if the gap and size of the sensing hole 73 are not uniform due to damage during use of the tone wheel 70 during use, the period of the pulse signal generated by the tone wheel sensor 20 may also be uneven.

In FIG. 4, the rising edge r1 and the falling edge f1 of the first period, the rising edge r2 and the falling edge f2 of the second period are equally spaced without significant difference. It can be seen that it occurred. However, it can be seen that the interval between the rising edge r3 and the falling edge f3 ′ of the third period is significantly different from the pulses of the preceding first and second periods. This is due to the difference in the spacing or size of the sensing holes 73 which generate the rising edge r3 and the falling edge f3 of the third period in the tone wheel 70 from other sensing holes.

Typical wheel speed calculation

Figure pat00003
Is calculated as Here, f3-f2 denotes a period indicated by 402 of FIG. 4. In this case, due to the influence of the error Δt occurring on the falling edge f3 'of FIG. 4, accurate speed calculation may not be achieved. However, if the wheel speed is calculated by reflecting two periods as shown in the 404 section of FIG.
Figure pat00004
This results in a more accurate speed measurement than the previous calculation. The table is as follows.




division



Tone Wheel SD 5% occurs

time


TCNT


SD


1 cycle


2 cycles
(Invention)

r1

0 ms

0


0%




19 kph




19 kph



f1

4 ms

4000

r2

8 ms

8000


0%




19 kph




19 kph



f2

12 ms

12000

r3

16 ms

16000


5%




20.2kph




19.6kph



f3

19.6 ms

19600

In the table above, TCNT is a timer count value and SD is a single deviation occurring in each cycle. That is, when calculating the wheel speed based on one cycle (that is, by applying f3-f2), ideally, the third falling edge (f3 ') that should occur at f3 actually occurs much earlier than that. Therefore, it is recognized that the rotation speed of the tone wheel is faster than the actual speed (measured speed is increased). However, when calculating the wheel speed based on two cycles as in the present invention (that is, calculating by applying (f3-f1) / 2), the difference between the actual f3 'and the ideal f3 is relatively reduced. Accurate wheel speed measurement is possible.

Claims (4)

Receive a pulse signal from a tone wheel sensor mounted to the wheel;
Calculate the rotational speed of the wheel using the number of pulses for at least two periods of the pulse signal;
And a vehicle speed measuring method based on a rotation speed of the wheel. The method of claim 1,
The speed calculation of the wheel
Figure pat00005
Vehicle speed measurement method calculated as follows. A tone wheel mounted to the wheel and rotating together with the wheel;
A tone wheel sensor for generating a pulse signal by reflecting the rotational speed of the tone wheel;
A vehicle speed measurement comprising a control unit receiving the pulse signal to calculate a rotation speed of the wheel using the number of pulses for at least two periods of the pulse signal, and measuring a speed of the vehicle based on the rotation speed of the wheel Device. The method of claim 3, wherein
The speed calculation of the wheel
Figure pat00006
Vehicle speed measuring device calculated as.
KR1020100087748A 2010-09-08 2010-09-08 Method of and apparatus for measuring speed of vehicle KR20120025698A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020100087748A KR20120025698A (en) 2010-09-08 2010-09-08 Method of and apparatus for measuring speed of vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020100087748A KR20120025698A (en) 2010-09-08 2010-09-08 Method of and apparatus for measuring speed of vehicle

Publications (1)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104122408A (en) * 2014-08-05 2014-10-29 华中科技大学 Speed measuring equipment for underwater wheel type trolley
KR101481136B1 (en) * 2013-12-18 2015-01-13 현대오트론 주식회사 Method and apparatus for detecting decrease in tire air pressure
CN106199045A (en) * 2014-09-15 2016-12-07 现代摩比斯株式会社 The speed measuring device of MDPS drive motor and method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101481136B1 (en) * 2013-12-18 2015-01-13 현대오트론 주식회사 Method and apparatus for detecting decrease in tire air pressure
CN104122408A (en) * 2014-08-05 2014-10-29 华中科技大学 Speed measuring equipment for underwater wheel type trolley
CN106199045A (en) * 2014-09-15 2016-12-07 现代摩比斯株式会社 The speed measuring device of MDPS drive motor and method

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