CN104569493B - Pitch error tests system - Google Patents
Pitch error tests system Download PDFInfo
- Publication number
- CN104569493B CN104569493B CN201310506620.8A CN201310506620A CN104569493B CN 104569493 B CN104569493 B CN 104569493B CN 201310506620 A CN201310506620 A CN 201310506620A CN 104569493 B CN104569493 B CN 104569493B
- Authority
- CN
- China
- Prior art keywords
- pitch error
- signal
- period
- signals
- target wheel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000012360 testing method Methods 0.000 title claims abstract description 48
- 238000005070 sampling Methods 0.000 claims description 4
- 239000000284 extract Substances 0.000 claims description 3
- 230000001186 cumulative effect Effects 0.000 claims description 2
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 3
- 239000011295 pitch Substances 0.000 description 68
- 238000010586 diagram Methods 0.000 description 10
- 238000000605 extraction Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Landscapes
- Arrangements For Transmission Of Measured Signals (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
Abstract
The invention discloses a kind of pitch errors to test system, which includes：Signal pickup assembly, the sensor signal for acquiring target wheel and motor encoder signal；Signal processing apparatus calculates the period of above-mentioned multiple pulse signals, and generate pitch error according to the above-mentioned period for obtaining multiple pulse signals that above-mentioned target wheel rotates a circle according to the sensor signal and above-mentioned motor encoder signal;Test device, for whether qualified according to the above-mentioned pitch error of pitch error standard testing.The present invention solves the problems, such as that pitch error test takes long in the related technology, has the advantageous effect for reducing the testing time.
Description
Technical Field
The invention relates to the field of automobiles, in particular to a tooth pitch error testing system.
Background
An Anti-lock Braking System (ABS) is an automobile safety control System with the advantages of skid resistance, locking prevention and the like, a wheel speed sensor arranged on a wheel sends a signal that the wheel is locked, a controller instructs a regulator to reduce the oil pressure of a wheel brake cylinder, the Braking torque is reduced, the original oil pressure is restored after a certain time, and the circulation is continuous, so that the wheel is in a rotating state and has the maximum Braking torque all the time.
The wheel speed sensor is a key device for acquiring vehicle operation parameters in an anti-lock brake system of an automobile. The wheel speed sensor is an important part for ensuring the normal work of an anti-lock brake system and the running safety of an automobile, and the tooth pitch error of the wheel speed sensor is one of important parameters of the wheel speed sensor and is a standard parameter for judging whether the wheel speed sensor is qualified or not. The pitch error comprises a single pitch error, an accumulated pitch error and a total accumulated pitch error, wherein the single pitch error is a percentage of an average value at a period of each pulse; each accumulated pitch error is a single pitch error sum from 0 to i, and in order to determine the errors of all pitches, the accumulated pitch error must be calculated; the total accumulated pitch error is the sum of the absolute values of the maximum and minimum of the accumulated pitch error.
In the related art, a method for calculating the pitch error is to read and store test data in a csv format from an oscilloscope, and then calculate a result in Excel. However, such a test method takes too long.
Aiming at the problem that the tooth pitch error test in the related technology consumes too long time, an effective solution is not provided at present.
Disclosure of Invention
The present invention provides a pitch error testing system to at least solve the above problems.
According to an aspect of the present invention, there is provided a pitch error testing system comprising: the signal acquisition device is used for acquiring sensor signals and motor encoder signals of the target wheel; the signal processing device is used for obtaining a plurality of pulse signals of one rotation of the target wheel according to the sensor signals and the motor encoder signals, calculating the periods of the pulse signals and generating a pitch error according to the periods; and the testing device is used for testing whether the tooth pitch error is qualified according to the tooth pitch error standard.
Optionally, the signal acquisition device is an oscilloscope, and the sampling type of the oscilloscope is set to be high-resolution.
Optionally, an edge trigger and a trigger voltage of the oscilloscope are set, and the motor encoder signal is triggered to be a reference signal, wherein the motor encoder signal comprises adjacent Z-phase pulses.
Optionally, the signal processing device is connected to the signal acquisition device through a general purpose interface bus GPIB.
Optionally, the signal processing device marks a start position and an end position of one period of the motor encoder signal, extracts the sensor signal according to the start position and the end position, and obtains the plurality of pulse signals of one rotation of the target wheel.
Optionally, the signal processing device calculates a period value of each pulse signal and an average period value of the plurality of pulse signals according to the plurality of pulse signals, and calculates a pitch error according to the period value of each pulse signal and the average period value of the plurality of pulse signals.
Optionally, the testing device is further configured to determine whether the sensor is qualified according to the pitch error, wherein the sensor is a wheel speed sensor.
Optionally, the system further comprises setting means for setting different offset values and air gap values to obtain different pitch errors.
Optionally, the setting means is further adapted to decrease the air gap value in case the pitch error is larger than a pitch error criterion; and/or in the case that the pitch error is smaller than the pitch error criterion, the setting means are also adapted to increase the air gap value; and/or the setting means is further for changing the offset value if the pitch error is less than the pitch error criterion and the offset value is less than an offset threshold value.
Optionally, the testing device is further configured to determine whether the wheel speed sensor of the target wheel is qualified according to the test result of the pitch error.
The invention adopts the following scheme: the signal acquisition device is used for acquiring sensor signals and motor encoder signals of the target wheel; the signal processing device is used for obtaining a plurality of pulse signals of one rotation of the target wheel according to the sensor signals and the motor encoder signals, calculating the periods of the pulse signals and generating a pitch error according to the periods; the testing device is used for testing whether the tooth pitch error is qualified according to the tooth pitch error standard, and the problem that the time consumed by the tooth pitch error test in the related technology is too long is solved, so that the effect of reducing the test time is achieved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic diagram of a pitch error test system according to an embodiment of the present invention;
FIG. 2 is a schematic workflow diagram of a pitch error testing system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a pitch error test system according to a preferred embodiment of the present invention;
FIG. 4 is a schematic workflow diagram of a pitch error testing system according to a preferred embodiment of the present invention;
FIG. 5 is a schematic diagram of the extraction of sensor signals and reference signals according to an embodiment of the invention; and
FIG. 6 is a schematic diagram of a sensor signal cycle according to an embodiment of the invention.
Detailed Description
The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
Fig. 1 is a schematic structural diagram of a pitch error testing system according to an embodiment of the present invention, and as shown in fig. 1, the system includes: the signal acquisition device 102 is used for acquiring sensor signals and motor encoder signals of the target wheel; a signal processing device 104, configured to obtain a plurality of pulse signals of one rotation of the target wheel according to the sensor signal and the motor encoder signal, calculate periods of the plurality of pulse signals, and generate a pitch error according to the periods; and the testing device 106 is used for testing whether the tooth pitch error is qualified according to the tooth pitch error standard. The working flow of the pitch error testing system is shown in fig. 2, and comprises the following steps:
and step S202, signal acquisition.
The signal acquisition device 102 acquires a sensor signal and a motor encoder signal of the target wheel, and transmits the acquired sensor signal and motor encoder signal to the signal processing device 104 through the GPIB.
And step S204, data processing.
The signal processing means 104 is connected to the signal acquisition means 102 via GPIB.
The signal processing device 104 receives the sensor signal of the target wheel and the motor encoder signal, calculates the sensor signal of one rotation of the target wheel, which is a plurality of pulse signals, calculates the period of the plurality of pulse signals, and then calculates the pitch error based on the calculated period.
The signal processing means 104 sends the calculated pitch error to the testing means 106.
And step S206, judging and displaying the result.
The testing device 106 determines whether the pitch error is within the standard range of pitch error, if so, the display result is not qualified, otherwise, the display result is qualified.
Fig. 3 is a schematic structural diagram of a pitch error testing system according to an embodiment of the present invention, and as shown in fig. 3, the system includes a computer 302, an oscilloscope 304, and a setting device 308, where the oscilloscope 304 and the computer 302 are connected through a GPIB 306. The computer 302 corresponds to the signal processing apparatus 104 in fig. 1, and the oscilloscope 304 corresponds to the signal acquisition apparatus 104 in fig. 1. The working flow of the pitch error testing system is shown in fig. 4, and comprises the following steps:
in step S402, an initial offset value and an initial air gap value are set.
The setting device 308 sets the initial offset amount and the initial value of the air gap under the control of the computer 302.
Step S404, collecting signals.
The step of acquiring signals specifically comprises the following steps S4040-4048:
in step S4040, the computer 302 reads and initializes the address GPIB of the oscilloscope 304 by the GPIB 306.
In step S4042, the oscilloscope 304 automatically sets.
In step S4044, the oscilloscope 304 sets the sampling type to high resolution.
By setting the sampling type to a high resolution, the influence of noise on the sensor signal can be reduced.
Step S4046 sets a 4-channel edge trigger and trigger voltage.
The oscilloscope 304 has 4 channels for motor encoder z-phase pulse signals and 1 channel for sensor signals. The motor rotates for a circle to generate a pulse signal, and a sensor signal obtained by the sensor collecting the target wheel rotating for a circle can be obtained according to the judgment of the time between two adjacent z-phase pulse signals. Specifically, the 4-channel signal can be triggered by setting the edge trigger and the trigger voltage as a reference.
Step S4048 reads the waveform data.
The computer 302 reads waveform data of the sensor signal of 1 channel and the motor encoder signal of 4 channels from the oscilloscope 304.
Step S406, data processing.
The data processing step may specifically include the following steps S4062 to 4068:
in step S4062, the start and end positions of one cycle of the 4 channels are marked.
Fig. 5 is a schematic diagram of the extraction of the sensor signal and the reference signal according to the embodiment of the present invention, and as shown in fig. 5, the rising or falling edge position of a pulse and the rising or falling edge position of the next pulse are found and recorded by the collected 4-channel waveform data of the oscilloscope 304, and are marked. The positions are actually the start and end positions of a 4 channel cycle.
Step S4064 extracts signal data of 1 channel from the start and end positions of the mark.
As shown in fig. 5, the signal data at the corresponding time position of the 1 channel is extracted according to the time positions, i.e., the start position and the end position, of the two pulses of the 4 channel, wherein the region corresponding to the data extracted by the 1 channel becomes the extraction region. According to fig. 5, the extraction area is only a part of the sensor signal, not the complete sensor information.
Step S4066, calculating the period value of each pulse in the extraction region and the average period value of the region. That is, the start position and the end position are calculated to extract the corresponding partial sensor signals, and the periodic average value of the partial sensor signals.
FIG. 6 is a schematic diagram of a sensor signal period according to an embodiment of the present invention, as shown in FIG. 6, T1 is the period of one pulse, T2 is the period of two pulses, and so on, T (n-1) is the period of n-1 pulses, and T (n) is the period of n pulses.
Step S4068 calculates a pitch error.
The pitch error result is calculated according to the formula | FP | ═ Ts-Tref)/Tref × 100%, | FP | ═ T (n) -n × Tref)/Tref × 100%, where | FP | is a single pitch error, | FP | is a cumulative pitch error, | Tref | (T (npp))/npp, Tref is an average period, T (npp) is a period of the total number of teeth of the target wheel, npp is the number of teeth of the target wheel, Ts | -T (n) -T (n-1), and n is a positive integer, representing the number of pulses.
And step S408, judging and displaying the result.
The result judging and displaying step may include the steps of:
s4082, judging whether the pitch error is within the standard range of the pitch error.
And judging whether the obtained pitch error result is within the range of the pitch error standard according to the pitch error standard, for example, judging whether | fp | is greater than 2%, wherein | fp | is the absolute value of the single pitch error, and 2% is the preset pitch error standard. If the range is exceeded, the process goes to step S4084, otherwise step S4086 is executed.
And step S4084, prompting that the pitch error result is out of tolerance.
The control setting device 308 reduces the air gap value and tests again.
Step S4086, determine whether the pitch error equals the pitch error criterion.
If not, the control setting device 308 increases the air gap value and tests again. If the pitch error is equal to the pitch error criterion, step S410 is performed.
Step S410, determine whether the offset reaches the test range.
And judging whether the offset reaches the test range, if so, executing the step S412, otherwise, increasing or decreasing the offset to continue the test until the offset reaches the test range.
In step S412, the offset amount and the air gap value are recorded.
From the above description, it can be seen that the present invention achieves the following technical effects: in order to ensure the normal work of the ABS system and obtain the running parameters of the vehicle, a qualified wheel speed sensor is required. The invention collects the sensor signal through the oscilloscope, processes the signal collected by the oscilloscope, calculates the tooth pitch error, and determines whether the wheel speed sensor is qualified according to the tooth pitch error. The invention simplifies the operation process and improves the testing efficiency.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A pitch error testing system, comprising:
the signal acquisition device is used for acquiring sensor signals and motor encoder signals of the target wheel;
the signal processing device is used for obtaining a plurality of pulse signals of one rotation of the target wheel according to the sensor signals and the motor encoder signals, calculating the periods of the pulse signals and generating a pitch error according to the periods; the signal processing device marks the starting position and the ending position of one period of the motor encoder signal, extracts corresponding partial sensor signals according to the starting position and the ending position, and obtains the plurality of pulse signals of one rotation of the target wheel;
the testing device is used for testing whether the tooth pitch error is qualified according to the tooth pitch error standard; and
setting means for setting different offset values and air gap values to obtain different pitch errors; wherein,
in the event that the pitch error is greater than a pitch error criterion, the setting means is further for decreasing the air gap value; and/or
In the event that the pitch error is less than the pitch error criterion, the setting means is further for increasing the air gap value; and/or
The setting means is also for changing the offset value if the pitch error is less than the pitch error criterion and the offset value is less than an offset threshold.
2. The system of claim 1, wherein the signal acquisition device is an oscilloscope, and a sampling type of the oscilloscope is set to high resolution.
3. The system of claim 2, wherein an edge trigger and trigger voltage of the oscilloscope are set to trigger the motor encoder signal to be a reference signal, wherein the motor encoder signal comprises adjacent Z-phase pulses.
4. The system according to claim 1, wherein said signal processing means is connected to said signal acquisition means via a general purpose interface bus GPIB.
5. The system of claim 1, wherein the signal processing device calculates a period value of each pulse signal and an average period value of the plurality of pulse signals from the plurality of pulse signals, and calculates a pitch error from the period value of each pulse signal and the average period value of the plurality of pulse signals.
6. The system of claim 1, wherein the testing device is further configured to determine whether the sensor is acceptable based on the pitch error, wherein the sensor is a wheel speed sensor.
7. The system of claim 1, 4 or 5, wherein the pitch error is calculated according to the formula | FP | ═ Ts-Tref)/Tref × 100%, | FP | ═ T (n) -n × Tref)/Tref × 100%, where | FP | is a single pitch error, | FP | is a cumulative pitch error, | Tref | ═ T (npp))/npp, Tref is an average period, T (npp) is a period of a total number of teeth of the target wheel, npp is a number of teeth of the target wheel, Ts ═ T (n) -T (n-1), T (n-1) is a period of n-1 pulses, T (n) is a period of n pulses, n is a positive integer, representing a number of pulses.
8. The system of claim 1, wherein 2% is a predetermined pitch error criterion, and wherein the pitch error is tested for acceptability based on determining whether the absolute value of the single pitch error is greater than the predetermined pitch error criterion.
9. The system according to any one of claims 1 to 6 and 8, wherein the testing device is further configured to determine whether the wheel speed sensor of the target wheel is qualified according to the test result of the pitch error.
10. The system of claim 7, wherein the testing device is further configured to determine whether the wheel speed sensor of the target wheel is qualified according to the test result of the pitch error.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310506620.8A CN104569493B (en) | 2013-10-24 | 2013-10-24 | Pitch error tests system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310506620.8A CN104569493B (en) | 2013-10-24 | 2013-10-24 | Pitch error tests system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104569493A CN104569493A (en) | 2015-04-29 |
| CN104569493B true CN104569493B (en) | 2018-09-07 |
Family
ID=53086039
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310506620.8A Active CN104569493B (en) | 2013-10-24 | 2013-10-24 | Pitch error tests system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104569493B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE202016005708U1 (en) | 2016-09-19 | 2017-12-21 | PREMETEC Automation GmbH | Gear measuring device |
| CN110618292A (en) * | 2018-06-20 | 2019-12-27 | 大陆汽车电子（连云港）有限公司 | Testing method of wheel speed sensor |
| CN109277879B (en) * | 2018-08-27 | 2020-07-28 | 西安工业大学 | Harmonic decomposition-based gear hobbing pitch error on-machine compensation method for large gear |
| CN115071726A (en) * | 2022-06-13 | 2022-09-20 | 经纬恒润(天津)研究开发有限公司 | Wheel speed measuring method, device and equipment |
| CN115825480B (en) * | 2022-10-20 | 2025-05-16 | 东风柳州汽车有限公司 | Wheel speed signal analysis method, device, equipment and storage medium |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2323352Y (en) * | 1998-01-06 | 1999-06-09 | 中国计量科学研究院 | Gear pitch error measuring device |
| CN101173864A (en) * | 2006-10-31 | 2008-05-07 | 三菱重工业株式会社 | Method and device for detecting tooth matching angle of gear |
| CN101710134A (en) * | 2009-12-02 | 2010-05-19 | 洛阳轴研科技股份有限公司 | Vehicle hub rotation speed sensor electrical parameter test device and test method |
| CN101963625A (en) * | 2009-07-21 | 2011-02-02 | 淮海工学院 | Labview-based test system of automotive wheel speed sensor |
| CN102279286A (en) * | 2011-06-23 | 2011-12-14 | 鼎佳（天津）汽车电子有限公司 | Wheel speed sensor tester |
| CN102359755A (en) * | 2011-08-09 | 2012-02-22 | 万向钱潮（上海）汽车系统有限公司 | Method for detecting pitch error of ABS gear ring by magnetic induction |
| CN102608358A (en) * | 2012-03-09 | 2012-07-25 | 中国农业大学 | System and method for multi-sensor comparative rotation speed test |
| CN102865807A (en) * | 2012-09-18 | 2013-01-09 | 东南大学 | Quick measurement method of gear pitch error |
| CN202676734U (en) * | 2012-06-04 | 2013-01-16 | 宁波拓普电器有限公司 | Automobile wheel speed sensor on-line detection system |
| CN203241435U (en) * | 2013-04-10 | 2013-10-16 | 浙江豪情汽车制造有限公司 | Wheel speed sensor testing table |
-
2013
- 2013-10-24 CN CN201310506620.8A patent/CN104569493B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2323352Y (en) * | 1998-01-06 | 1999-06-09 | 中国计量科学研究院 | Gear pitch error measuring device |
| CN101173864A (en) * | 2006-10-31 | 2008-05-07 | 三菱重工业株式会社 | Method and device for detecting tooth matching angle of gear |
| CN101963625A (en) * | 2009-07-21 | 2011-02-02 | 淮海工学院 | Labview-based test system of automotive wheel speed sensor |
| CN101710134A (en) * | 2009-12-02 | 2010-05-19 | 洛阳轴研科技股份有限公司 | Vehicle hub rotation speed sensor electrical parameter test device and test method |
| CN102279286A (en) * | 2011-06-23 | 2011-12-14 | 鼎佳（天津）汽车电子有限公司 | Wheel speed sensor tester |
| CN102359755A (en) * | 2011-08-09 | 2012-02-22 | 万向钱潮（上海）汽车系统有限公司 | Method for detecting pitch error of ABS gear ring by magnetic induction |
| CN102608358A (en) * | 2012-03-09 | 2012-07-25 | 中国农业大学 | System and method for multi-sensor comparative rotation speed test |
| CN202676734U (en) * | 2012-06-04 | 2013-01-16 | 宁波拓普电器有限公司 | Automobile wheel speed sensor on-line detection system |
| CN102865807A (en) * | 2012-09-18 | 2013-01-09 | 东南大学 | Quick measurement method of gear pitch error |
| CN203241435U (en) * | 2013-04-10 | 2013-10-16 | 浙江豪情汽车制造有限公司 | Wheel speed sensor testing table |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104569493A (en) | 2015-04-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104569493B (en) | Pitch error tests system | |
| US11573105B2 (en) | Sensor system using safety mechanism | |
| CN109050576B (en) | Wheel diameter correction method, device, equipment and readable storage medium | |
| DE102010004149B4 (en) | Method and device for determining the mileage of a tire | |
| HRP20200839T1 (en) | Method for determining a current wheel diameter | |
| CN109633442A (en) | Detection method, device, equipment and the storage medium of generator speed fluctuation | |
| US5487595A (en) | Dual hysteresis method of generating square waves from automotive wheel speed signals | |
| DE102013013614A1 (en) | Electric power steering system and steering angle output method thereof | |
| DE102014212760A1 (en) | Method and device for checking the plausibility of speed data | |
| CN102422235B (en) | Determining an equivalent mechanical load | |
| Ruth et al. | Accuracy of event data in the 2010 and 2011 Toyota camry during steady state and braking conditions | |
| CN106199419A (en) | The amplification electric current detecting method of three phase electric machine is controlled during for brake hard occurs | |
| DE102014111797A1 (en) | Method and device for monitoring the rotational position of an electrical machine | |
| CN116734911A (en) | Sensor state monitoring method and device | |
| DE102013114366A1 (en) | TIRE PRESSURE MONITORING MODULE, TIRE PRESSURE MONITORING SYSTEM WITH SUCH A | |
| US10775209B2 (en) | Control circuit and method for checking the plausibility of a rotor position angle | |
| CN112834942A (en) | Battery management system life test method and device based on temperature alternating test | |
| DE112007003522T5 (en) | Rotary position detection method for an AC servomotor and simple encoder | |
| US9103744B2 (en) | Method and apparatus for redundant detection of a rotational direction | |
| US8390273B2 (en) | Slew rate compensated wheel speed sensor signal processing method and system | |
| CN102377382A (en) | Control device and control method for motor | |
| DE102013114368A1 (en) | TIRE PRESSURE MONITORING MODULE, TIRE PRESSURE MONITORING SYSTEM WITH SUCH A | |
| JP2006069699A (en) | Method and device for diagnosing elevator system | |
| CN106094791B (en) | Vehicle Controller and its fault time acquisition methods, diagnostic system and automobile | |
| KR20180016445A (en) | Wheel speed calculation method and corresponding measuring device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |