KR101725688B1 - Apparatus for processing wheel speed sensor input signal of vehicle and method therof - Google Patents

Apparatus for processing wheel speed sensor input signal of vehicle and method therof Download PDF

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Publication number
KR101725688B1
KR101725688B1 KR1020150176891A KR20150176891A KR101725688B1 KR 101725688 B1 KR101725688 B1 KR 101725688B1 KR 1020150176891 A KR1020150176891 A KR 1020150176891A KR 20150176891 A KR20150176891 A KR 20150176891A KR 101725688 B1 KR101725688 B1 KR 101725688B1
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KR
South Korea
Prior art keywords
wheel
speed signal
vehicle speed
vehicle
delay time
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KR1020150176891A
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Korean (ko)
Inventor
조현광
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현대오트론 주식회사
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Priority to KR1020150176891A priority Critical patent/KR101725688B1/en
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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
    • B60T8/17616—Microprocessor-based systems
    • 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
    • B60T8/173—Eliminating or reducing the effect of unwanted signals, e.g. due to vibrations or electrical noise
    • 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
    • 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
    • B60T2270/00—Further aspects of brake control systems not otherwise provided for
    • B60T2270/40—Failsafe aspects of brake control systems
    • B60T2270/416—Wheel speed sensor failure
    • 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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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Regulating Braking Force (AREA)

Abstract

The present invention relates to an apparatus for processing a wheel speed sensor input signal of a vehicle, which comprises: a wheel speed sensor detecting the rotational speed signal of each wheel of a vehicle; a vehicle speed signal processing device converting and outputting the rotational speed signal of each wheel detected from the wheel speed sensor to a digital vehicle speed signal; and a delay circuit unit controlling delay time of the digital vehicle speed signal outputted from the vehicle speed signal processing device in accordance with a revolutions per minute (RPM) value of each wheel.

Description

Technical Field [0001] The present invention relates to an apparatus for processing a wheel speed sensor input signal,

The present invention relates to an apparatus and a method for processing a wheel speed sensor input signal of a vehicle.

BACKGROUND ART [0002] In general, an anti-lock brake system (ABS) system for securing a stable brake performance or an electronic brake (TCS) system for suppressing excessive slip of a drive wheel System.

In such an electronic brake system, it is important to accurately detect whether or not the wheel speed sensor is noisy because the vehicle speed is detected based on the wheel speed detected from the wheel speed sensor.

Generally, a wheel speed sensor is composed of a rotor and a pole piece which are integrally formed with a wheel, and the rotor has a tooth-like tooth formed on its outer circumferential surface, As shown in Fig. When the magnetic field change is converted into a pulse-like electrical signal and detected, the wheel speed can be obtained.

That is, when the tone wheel of the wheel speed sensor rotates, the sensor senses the tooth of the wheel to generate a square wave. Such a square wave is not generated in a constant cycle but has a different cycle depending on the wheel speed. In particular, when the rotational speed of the wheel is low, the wheel speed sensor generates a long period of square wave.

The square wave of another period transmitted from the wheel speed sensor is input to a microprocessor control unit (MCU), and the microcontroller MCU performs a turn-on / turn-off -off), and the wheel speed is measured.

However, the conventional wheel speed sensor is added to the input port of the microprocessor control unit (MCU) which is the final controller by adding several delay times, which is not proportional to or inversely proportional to the rotation speed (RPM) (RPM) to convert to a rotation angle. Accordingly, a separate software (SW) resource is required.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to compensate for different delay times according to the rotation speed (RPM) of the wheel so as to have the same delay rotation angle at all rotation speeds (RPM) It is possible to eliminate the process of converting the delay time according to the rotation speed RPM into the rotation angle by the existing microprocessor control unit (MCU), to manage more efficient resources, And a method of processing the wheel speed sensor input signal.

According to an aspect of the present invention, there is provided a vehicular drive system including a wheel speed sensor for sensing a rotational speed signal of each wheel of a vehicle, a vehicle speed sensor for converting a rotational speed signal of each wheel sensed by the wheel speed sensor into a digital vehicle speed signal, And a delay circuit for adjusting the delay time of the digital vehicle speed signal outputted from the vehicle speed signal processing device in accordance with the rotation speed value of each wheel.

Here, it is preferable that the delay circuit unit adjusts the delay time based on a predetermined reference rotation speed value.

Preferably, the delay circuit section may determine a correction time based on the reference rotation speed value, and adjust the delay time using the correction time.

Preferably, the delay circuit unit decreases the delay time by a predetermined correction time when the rotation speed value corresponding to the digital vehicle speed signal output from the vehicle speed signal processing device is larger than the reference rotation speed value, When the rotation speed value corresponding to the digital vehicle speed signal outputted from the processing device is smaller than the reference rotation speed value, the delay time can be increased by the correction time.

According to the wheel speed sensor input signal processing apparatus and method for processing a vehicle wheel speed sensor of the present invention as described above, it is possible to reduce the delay time It is possible to eliminate the process of converting the delay time according to the rotation speed RPM into the rotation angle by the conventional microprocessor control unit (MCU), and it is possible to manage a more efficient resource, There is an advantage that the error rate according to the error of the wheel speed can be effectively reduced.

FIG. 1 is a block diagram illustrating an apparatus for processing a wheel speed sensor input signal of a vehicle according to an embodiment of the present invention. Referring to FIG.
2 is a general flowchart for explaining a wheel speed sensor input signal processing method of a vehicle according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will be more apparent from the following detailed description taken in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification. "And / or" include each and every combination of one or more of the mentioned items.

Although the first, second, etc. are used to describe various elements, components and / or sections, it is needless to say that these elements, components and / or sections are not limited by these terms. These terms are only used to distinguish one element, element or section from another element, element or section. Therefore, it goes without saying that the first element, the first element or the first section mentioned below may be the second element, the second element or the second section within the technical spirit of the present invention.

The terminology used herein is for the purpose of illustrating embodiments and is not intended to be limiting of the present invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. It is noted that the terms "comprises" and / or "comprising" used in the specification are intended to be inclusive in a manner similar to the components, steps, operations, and / Or additions.

Also, the terms "part," " module, "and the like described in the specification mean units for processing at least one function or operation, which may be implemented in hardware or software or a combination of hardware and software .

Unless defined otherwise, all terms (including technical and scientific terms) used herein may be used in a sense commonly understood by one of ordinary skill in the art to which this invention belongs. Also, commonly used predefined terms are not ideally or excessively interpreted unless explicitly defined otherwise.

In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions in the embodiments of the present invention, which may vary depending on the intention of the user, the intention or the custom of the operator. Therefore, the definition should be based on the contents throughout this specification.

Each block of the accompanying block diagrams and combinations of steps of the flowcharts may be performed by computer program instructions (execution engines), which may be stored in a general-purpose computer, special purpose computer, or other processor of a programmable data processing apparatus The instructions that are executed through the processor of the computer or other programmable data processing equipment will generate means for performing the functions described in each block or flowchart of the block diagram. These computer program instructions may also be stored in a computer usable or computer readable memory capable of directing a computer or other programmable data processing apparatus to implement the functionality in a particular manner so that the computer usable or computer readable memory It is also possible for the instructions stored in the block diagram to produce an article of manufacture containing instruction means for performing the functions described in each block or flowchart of the flowchart.

Computer program instructions may also be loaded onto a computer or other programmable data processing equipment so that a series of operating steps may be performed on a computer or other programmable data processing equipment to create a computer- It is also possible that the instructions that perform the data processing equipment are capable of providing the steps for executing the functions described in each block of the block diagram and at each step of the flowchart.

Also, each block or step may represent a portion of a module, segment, or code that includes one or more executable instructions for executing the specified logical functions, and in some alternative embodiments, It should be noted that functions may occur out of order. For example, two successive blocks or steps may actually be performed substantially concurrently, and it is also possible that the blocks or steps are performed in the reverse order of the function as needed.

FIG. 1 is a block diagram illustrating an apparatus for processing a wheel speed sensor input signal of a vehicle according to an embodiment of the present invention. Referring to FIG.

1, a wheel speed sensor input signal processing apparatus for a vehicle according to an embodiment of the present invention includes a wheel speed sensor 100, a vehicle speed signal processing apparatus 200, a delay circuit unit 300, and the like .

Here, the wheel speed sensor 100 performs a function of sensing a rotational speed signal of each wheel of the vehicle. That is, the wheel speed sensor 100 is provided on each wheel of the vehicle and measures the wheel speed of each wheel. The wheel speed of the front wheel, the wheel speed of the front wheel, the wheel speed of the rear wheel, .

Although the wheel speed sensor 100 is not shown, the wheel speed sensor 100 is composed of a circular plate provided with a tooth-like tooth at a predetermined interval on its outer periphery, and includes a rotor that rotates integrally with the wheel, And a pole piece (Poleplece) which is provided at a position spaced apart from the wheel by a predetermined distance to detect a change in distance between the wheel and the wheel when each wheel corresponds to each wheel, and outputs the detected change as a detection signal of the sine wave.

The wheel speed sensor 100 may be an inductive sensor that changes the output current according to the rotation of the wheel. However, the present invention is not limited to this, and the wheel speed sensor 100 may be grounded at one end And the other end is connected to the battery side of the vehicle. The sensor output can eliminate the influence of the ground noise, and it is possible to eliminate the influence of the ground noise, A sensor (Hall IC) may be applied.

That is, the hall sensor outputs a constant current by changing the position of the crest and the crest of the tone wheel mounted on the wheel. The high-level current is about 11.8 mA to 16.8 mA and the low-level current is about 5.9 mA - Output within 8.4mA range.

The vehicle speed signal processing apparatus 200 receives the rotation speed signal of each wheel sensed by the wheel speed sensor 100 and converts the rotation speed signal into a digital vehicle speed signal.

That is, the sine wave, which is the rotational speed signal output from the wheel speed sensor 100, is an analog value and can not be recognized by the microprocessor control unit (MCU). Therefore, the signals are A / D (Analog / Digital) converted by the vehicle speed signal processing device 200, which is a sensor interface circuit, and then input to the microprocessor control unit (MCU). At this time, the microprocessor control unit (MCU) receives the square wave signal converted into the digital value from the vehicle speed signal processing device 200 and counts the square wave signal to detect the wheel speed.

Although not shown in the drawing, such a vehicle speed signal processing apparatus 200 typically includes a filter section for filtering the noise of the sensor output, a reference voltage for outputting a predetermined reference voltage, a filtered sensor output and a reference voltage A waveform shaping unit for forming and outputting a velocity detection signal of a rectangular pulse, and a hysteresis regulator for regulating a hysteresis voltage to receive one end of the filtered sensor output and adjust an output characteristic thereof.

The detection signal of the sinusoidal wave detected by the wheel speed sensor 100 is amplified by the amplifying unit and is waveform-shaped by the waveform shaping unit and converted into a pulse signal. This pulse signal is input to the microprocessor control unit (MCU). Then, the microprocessor control unit (MCU) calculates the wheel speed based on the pulse signal. At this time, the microprocessor control unit (MCU) samples the pulse signal every predetermined period, detects the rise and the edge direction of the pulse, and calculates the wheel speed based on the rise and the edge directions of the pulse signal.

The delay circuit unit 300 adjusts the delay time of the digital vehicle speed signal output from the vehicle speed signal processing apparatus 200 according to the rotational speed RPM of each wheel and outputs the delay time to the microprocessor control unit MCU .

In addition, the delay circuit unit 300 preferably adjusts the delay time based on the predetermined reference rotation speed value.

Further, it is preferable that the delay circuit unit 300 determines the correction time based on the reference rotation speed value, and adjusts the delay time using the correction time.

When the rotation speed value corresponding to the digital vehicle speed signal output from the vehicle speed signal processing device is greater than the reference rotation speed value, the delay circuit portion 300 reduces the delay time by a predetermined correction time, When the rotation speed value corresponding to the digital vehicle speed signal outputted from the processing device is smaller than the reference rotation speed value, the delay time can be increased by the correction time. On the other hand, the reference rotation speed and the correction time may be changed according to the maximum rotation speed (RPM) value of the vehicle.

Hereinafter, a method of processing a wheel speed sensor input signal of a vehicle according to an embodiment of the present invention will be described in detail.

2 is a general flowchart for explaining a wheel speed sensor input signal processing method of a vehicle according to an embodiment of the present invention.

Referring to FIGS. 1 and 2, a wheel speed sensor input signal processing method of a vehicle according to an embodiment of the present invention first detects a rotational speed signal of each wheel of a vehicle through a wheel speed sensor 100 S100).

Thereafter, the rotation speed signal of each wheel detected in step S100 is converted into a digital vehicle speed signal through the vehicle speed signal processing device 200 (S200).

Then, based on the digital vehicle speed signal outputted at the step S200 through the delay circuit unit 300, based on the rotational speed (RPM) value so as to be output at the same delayed rotational angle at all rotational speeds (RPM) The delay time is adjusted (S300). That is, the delay circuit unit 300 adjusts the delay time of the digital vehicle speed signal output from the vehicle speed signal processing apparatus in accordance with the rotational speed (RPM) value of each wheel.

At this time, in step S300, the delay circuit unit 300 preferably adjusts the delay time based on the preset reference rotation speed value.

In addition, in step S300, the delay circuit unit 300 may determine the correction time based on the reference rotation speed value, and adjust the delay time using the correction time.

If the rotation speed value corresponding to the digital vehicle speed signal output from the vehicle speed signal processing device is greater than the reference rotation speed value, the delay circuit 300 determines whether the delay time is reduced by a predetermined correction time And when the rotation speed value corresponding to the digital vehicle speed signal outputted from the vehicle speed signal processing device is smaller than the reference rotation speed value, the delay time can be increased by the correction time.

For example, assuming that the delay angle is 1 ° at all rotational speeds (RPM) and that the delay time is constant at 10 μs, if the wheel with 60 teeth rotates at 1000 RPM, The rotation angle is 0.06 °. If the rotation speed is 2000 RPM, it is twice as fast as 1000 RPM, so the delay rotation angle is 0.12 °.

Here, assuming that the reference rotation speed (RPM) is 6000RPM, the maximum rotation angle of 0.36 ° is delayed at 6000RPM. At this time, in order to make the delay rotation angle with respect to all the rotation speeds RPM equal to the delay rotation angle (0.36 degrees) of the reference rotation speed, the delay circuit unit 300 adds 50 μs of delay time at 1000 RPM, A delay time of 40 μs is added. Thus, for all rotational speeds, the delay rotation angle is equally 0.36 °. At this time, 50 μs and 40 μs are the correction times determined based on the delay rotation angle (0.36 °) of 6000 RPM, which is the reference rotation speed value, of the delay circuit portion 300.

If the rotational speed of the wheel is 8000 RPM, which is greater than the reference rotational speed 6000 RPM, the delay circuit 300 can reduce the delay time corresponding to 8000 RPM by the correction time (20 mu s) calculated as above. That is, the correction time (20 μs) corresponding to the current rotation speed of 8000 RPM is determined based on the reference rotation speed value of 6000 RPM (0.36 °), and the correction time (20 μs) is used to correspond to 8000 RPM The delay time can be adjusted.
Accordingly, the present invention can compensate for different delay times according to the rotational speed (RPM) of the wheel so as to have the same delay rotation angle at all rotational speeds (RPM) It is possible to eliminate the process of converting the delay time according to the rotation speed RPM into the rotation angle, to manage more efficient resources, and to effectively reduce the error rate according to the wheel speed error.

Meanwhile, the wheel speed sensor input signal processing method for a vehicle according to an embodiment of the present invention can also be implemented as a computer readable code on a computer readable recording medium. A computer-readable recording medium includes all kinds of recording apparatuses in which data that can be read by a computer system is stored.

For example, the computer-readable recording medium includes a ROM, a RAM, a CD-ROM, a magnetic tape, a hard disk, a floppy disk, a removable storage device, a nonvolatile memory, , And optical data storage devices.

In addition, the computer readable recording medium may be distributed and executed in a computer system connected to a computer communication network, and may be stored and executed as a code readable in a distributed manner.

Although the present invention has been described in connection with the preferred embodiments thereof with reference to the appended claims, the detailed description of the invention and the accompanying drawings, It is possible to carry out various modifications within the scope and also belong to the present invention.

100: Wheel speed sensor,
200: vehicle speed signal processing device,
300:

Claims (8)

A wheel speed sensor for sensing a rotational speed signal of each wheel of the vehicle;
A vehicle speed signal processing device for converting a rotation speed signal of each wheel sensed by the wheel speed sensor into a digital vehicle speed signal and outputting the signal; And
And a delay circuit for adjusting a delay time of the digital vehicle speed signal output from the vehicle speed signal processing device in accordance with a rotation speed value corresponding to the digital vehicle speed signal.
The method according to claim 1,
Wherein the delay circuit unit adjusts the delay time based on a predetermined reference rotation speed value.
3. The method of claim 2,
Wherein the delay circuit unit determines a correction time based on the reference rotation speed value and adjusts the delay time using the correction time.
The method according to claim 1,
Wherein the delay circuit unit decreases the delay time by a predetermined correction time when the rotation speed value corresponding to the digital vehicle speed signal outputted from the vehicle speed signal processing device is larger than the reference rotation speed value, When the rotational speed value corresponding to the digital vehicle speed signal is smaller than the reference rotational speed value, increases the delay time by the correction time.
(a) sensing a rotational speed signal of each wheel of the vehicle through a wheel speed sensor;
(b) converting a rotational speed signal of each wheel detected in step (a) into a digital vehicle speed signal through a vehicle speed signal processing device and outputting the signal; And
(c) adjusting the delay time of the digital vehicle speed signal outputted in the step (b) through a delay circuit according to a rotational speed value corresponding to the digital vehicle speed signal.
6. The method of claim 5,
Wherein in the step (c), the delay circuit unit adjusts the delay time based on a predetermined reference rotation speed value.
The method according to claim 6,
Wherein in the step (c), the delay circuit unit determines a correction time based on the reference rotation speed value, and adjusts the delay time using the correction time. Way.
6. The method of claim 5,
In the step (c), if the rotation speed value corresponding to the digital vehicle speed signal outputted from the vehicle speed signal processing device is greater than the reference rotation speed value, the delay circuit section reduces the delay time by a predetermined correction time, When the rotational speed value corresponding to the digital vehicle speed signal outputted from the vehicle speed signal processing device is smaller than the reference rotational speed value, the delay time is increased by the correction time .
KR1020150176891A 2015-12-11 2015-12-11 Apparatus for processing wheel speed sensor input signal of vehicle and method therof KR101725688B1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR970036259A (en) * 1995-12-29 1997-07-22 전성원 Driving Information Processing Method of Vehicle Transmission
JPH1134842A (en) * 1997-07-17 1999-02-09 Toyota Central Res & Dev Lab Inc Antilock brake control device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR970036259A (en) * 1995-12-29 1997-07-22 전성원 Driving Information Processing Method of Vehicle Transmission
JPH1134842A (en) * 1997-07-17 1999-02-09 Toyota Central Res & Dev Lab Inc Antilock brake control device

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