CN109917149A - A kind of ABS wheel speed sensors testboard - Google Patents
A kind of ABS wheel speed sensors testboard Download PDFInfo
- Publication number
- CN109917149A CN109917149A CN201711331501.8A CN201711331501A CN109917149A CN 109917149 A CN109917149 A CN 109917149A CN 201711331501 A CN201711331501 A CN 201711331501A CN 109917149 A CN109917149 A CN 109917149A
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- CN
- China
- Prior art keywords
- wheel speed
- speed sensors
- abs wheel
- testboard
- transmission shaft
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- 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.)
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Abstract
The invention discloses a kind of ABS wheel speed sensors testboards, including testboard ontology, the testboard ontology is rotatably connected to transmission shaft vertically, the transmission shaft top is fixed with the fixing seat for stretching out testboard body surface, the transmission shaft is by being provided with motor driven, the fixing seat upper surface is provided with the hub bearing to match with ABS wheel speed sensors, the testboard ontology is provided with the oscillograph for showing ABS wheel speed sensors output waveform, the oscillograph is connected with data-interface and the data collector with data-interface, the testboard ontology is additionally provided with for providing the power device of operating voltage.A kind of ABS wheel speed sensors testboard of the invention, to guarantee the qualification rate of the ABS wheel speed sensors to come into the market.
Description
Technical field
The present invention relates to auto parts and components detecting tools, more specifically, it relates to which a kind of ABS wheel speed sensors are tested
Platform.
Background technique
Can be by the complete locking of wheel when automobile emergency brake, the complete locking of wheel is very dangerous when running at high speed.If
Front-wheel locking will make automobile lose steering capability；If rear lock, it will whipping or u-turn occur, especially in road surface slippery situation
In the case of, traffic safety is caused great harm." ABS " (Anti-locked Braking System) Chinese is translated into " anti-
Locking brake system ", it is that a kind of have many advantages, such as anti-skidding, anti-locking vehicle safety control system；Its existing common braking
The braking function of system, and wheel locked can be prevented, make automobile remain to turn to down in the braking state, guarantees the braking direction of automobile
Stability prevents sideslip and sideslip, is most advanced, the optimal brake apparatus of braking effect on current automobile.And ABS wheel speed
Sensor is very important sensing mechanism in ABS anti-lock braking system, is installed on hub bearing, is mainly used for detecting
Then the tach signal of wheel, and tach signal is inputed to automobile ECU by automobile ECU calculating is decided whether to carry out antilock again
Tight braking control for brake.
ABS wheel speed sensors are divided into ABS active wheel speed sensor and ABS passive wheel speed sensor.Wherein, ABS quilt
The electromagnet that dynamic formula wheel speed sensors pass through coil by one group forms；When the nearly sensing of protrusion tap of the gear teeth in hub bearing
When device magnetizer, magnetic flux increases；When the protrusion of the gear teeth separates magnetizer, magnetic flux reduces；The motion result of the gear teeth draws
It plays magnetic flux to change over time, proportional alternating voltage is induced in coil.ABS active wheel speed sensor is based on suddenly
Your effect principle and will be measured；Its sensing head is by permanent magnet, the composition such as Hall element and electronic circuit, the magnetic line of force of permanent magnet
Lead to gear across Hall element, the magnetic line of force across Hall element is concentrated, and magnetic field is relatively strong；When gear rotates, so that wearing
The density of line of magnetic force for crossing Hall element changes, thus causes the variation of Hall voltage, and Hall element will export a millivolt
The quasi-sine-wave voltage of grade.
Therefore the Stability and veracity of ABS wheel speed sensors signal transmitting involved in ABS anti-lock braking system
An important factor for being to ensure that driving safety, thus the qualification of the electric property of ABS wheel speed sensors need carry out one by one test and
After verifying, it can come into the market.
Therefore need to design a kind of ABS wheel speed sensors testboard to solve this problem.
Summary of the invention
In view of the deficiencies of the prior art, the present invention intends to provide a kind of ABS wheel speed sensors testboard, with
Guarantee the qualification rate of the ABS wheel speed sensors to come into the market.
Above-mentioned technical purpose of the invention has the technical scheme that a kind of ABS wheel speed sensors are surveyed
Test stand, including testboard ontology, the testboard ontology are rotatably connected to transmission shaft vertically, and the transmission shaft top, which is fixed with, stretches
The fixing seat of testboard body surface out, the transmission shaft are provided with by being provided with motor driven, the fixing seat upper surface
The hub bearing to match with ABS wheel speed sensors, the testboard ontology are provided with for showing that ABS wheel speed sensors export
The oscillograph of waveform, the oscillograph are connected with data-interface and the data collector with data-interface, the testboard
Ontology is additionally provided with for providing the power device of operating voltage.
By using above-mentioned technical proposal, the ABS wheel speed sensors that production is completed are transported to by testboard and are carried out one by one
Detection, and non-defective unit and defective products are classified；When passive type ABS wheel speed sensors are detected, passive type ABS wheel speed is passed
Sensor connection insertion and the direct-connected data-interface of oscillograph, start motor to drive hub bearing to be rotated, passive type ABS takes turns
Fast sensor sensing exports proportional alternating voltage, the first passage of oscillograph receive input signal and show it is corresponding just
String waveform；When active ABS wheel speed sensors are detected, active ABS wheel speed sensors connection insertion data collector
On data-interface in, start motor to drive hub bearing to be rotated, cause active ABS wheel speed sensors output Hall
The variation of voltage, data collector collection voltages signal are delivered to the second channel of oscillograph, the corresponding side of oscilloscope display
Wave；Whether inspector is correct by the waveform that observation oscilloscope is shown, to judge whether the ABS wheel speed sensors are qualified product,
To guarantee the qualification rate of the ABS wheel speed sensors to come into the market.
The present invention is further arranged to: the testboard ontology is additionally provided with for detecting ABS wheel speed sensors output electricity
The digital voltmeter and ohmmeter of pressure, the side of the transmission shaft are provided with carbon brush, and the carbon brush fits in transmission shaft, the biography
Be provided with bakelite plate between moving axis and testboard ontology, the ohmmeter be used to detect the internal resistance of ABS wheel speed sensors with
And the earth impedance of ABS wheel speed sensors；When transmission shaft drives hub bearing rotation, ohmmeter detects ABS wheel speed sensors
Earth impedance.
By using above-mentioned technical proposal, when the velocity of rotation of transmission shaft is 120 revs/min, output voltage is normal
For 0.8V or so, increase the detection to ABS wheel speed sensors output voltage, to increase the accuracy of detection；Passive type ABS wheel speed
There are enameled wires in the shell of sensor, and cause enameled wire and shell that short circuit occurs in production and processing, then passive type ABS
Wheel speed sensors are defective products, then when being detected in the present invention, by ohmmeter to passive type ABS wheel speed sensors
Ground resistance is detected, if qualified product, then ohmmeter is shown as infinitely great；If short circuit, Europe occur for enameled wire and shell
Nurse table shows resistance value, to detect whether passive type ABS wheel speed sensors occur short circuit, further increases ABS wheel speed biography
The accuracy of sensor detection.
The present invention is further arranged to: the motor is connected with rotating forward pedal and reversion pedal for controlling positive and negative rotation.
By using above-mentioned technical proposal, inspector controls motor by trampling rotating forward pedal and reversion pedal respectively
Positive and negative rotation, to drive hub bearing to carry out positive and negative rotation, inspector of being more convenient for is operated.
The present invention is further arranged to: the input terminal of the motor is coupled with frequency converter, and the frequency converter has control plane
Plate.
By using above-mentioned technical proposal, inspector adjusts the voltage and frequency of power supply, to reach by control panel
Is adjusted by the revolving speed of motor, is mentioned according to the actual needs of the ABS wheel speed sensors of different model for the purpose that motor is adjusted the speed
The accuracy of high measurement.
The present invention is further arranged to: the frequency converter is individually isolated by being provided with isolation board.
By using above-mentioned technical proposal, frequency converter can cause greatly to interfere in working condition to its neighbouring equipment,
It so as to cause the inaccurate of measurement, therefore is isolated in an independent region by isolation board, to avoid to other equipment
It interferes.
The present invention is further arranged to: the power device output end is connected with power-supply filter.
By using above-mentioned technical proposal, the harmonic filtration that power device is exported, to reduce the influence generated to power grid.
The present invention is further arranged to: the transmission shaft side is provided with the revolution speed sensing for detecting rotating speed of transmission shaft
Device, the speed probe export rotary speed detecting signal, and the signals of rotational speed sensor is connected with revolving speed display module, and described turn
Fast display module shows tachometer value according to rotary speed detecting signal.
By using above-mentioned technical proposal, the revolving speed of transmission shaft is detected by speed probe, and to revolving speed display module
Rotary speed detecting signal is sent, so that revolving speed display module shows tachometer value according to the rotary speed detecting signal received, in order to
Inspector views current revolving speed；And when inspector adjusts revolving speed, the more intuitive tachometer value for knowing currently to adjust, just
It is adjusted in inspector.
The present invention is further arranged to: the fixing seat upper surface is fixed with the scroll chuck for stationary hub bearing.
By using above-mentioned technical proposal, hub bearing is fixed in fixing seat by scroll chuck, when needing to detect
When the ABS wheel speed sensors of different model, it can rapidly replace and the hub bearing that ABS wheel speed sensors match need to be detected,
To reach the wider array of purpose of adaptation range.
The present invention is further arranged to: the data-interface is connected with the signal wire to match with ABS wheel speed sensors.
By using above-mentioned technical proposal, because data-interface often carries out plug and can be easier to damage, and after damage
Maintenance replacement is fairly cumbersome；Existing one signal wire of pre-connection, when detecting directly by the other end of signal wire and ABS wheel speed sensors
It is connected, avoids and repeatedly generate plug with data-interface.
In conclusion the invention has the following advantages:
First, whether the waveform that inspector can directly be shown by observation oscilloscope is correct, to judge that the ABS wheel speed sensors are
No is qualified product, to guarantee the qualification rate of the ABS wheel speed sensors to come into the market；
Second, increasing detection of the digital voltmeter to ABS wheel speed sensors output voltage, and passive type is detected by ohmmeter
Whether ABS wheel speed sensors occur short circuit, further increase the accuracy of ABS wheel speed sensors detection；
Third, hub bearing is fixed in fixing seat by scroll chuck, can rapidly replace and ABS wheel speed sensing need to be detected
The hub bearing that device matches, to reach the wider array of purpose of adaptation range.
Detailed description of the invention
Fig. 1 is overall structure diagram of the invention；
Fig. 2 is the portion the A partial enlargement diagram of Fig. 1；
Fig. 3 is backsight structural representation of the invention；
Fig. 4 is the testing principle circuit diagram of ohmmeter.
In figure: 1, testboard ontology；2, transmission shaft；3, fixing seat；4, motor；5, hub bearing；6, oscillograph；7, data
Interface；8, data collector；9, power device；10, digital voltmeter；11, ohmmeter；121, pedal is rotated forward；122, pedal is inverted；
13, frequency converter；131, control panel；14, carbon brush；15, speed probe；16, revolving speed display module；17, isolation board；18, electric
Source filter；19, bakelite plate；20, scroll chuck；21, signal wire；22, bearing block.
Specific embodiment
With reference to the accompanying drawings and examples, the present invention will be described in detail.
A kind of ABS wheel speed sensors testboard, as shown in Figure 1 and Figure 2, including testboard ontology 1, testboard ontology 1 pass through
Two bearing blocks 22 are rotatably connected to transmission shaft 2 vertically, and two bearing blocks 22 are bolted on testboard ontology 1,
And it is located at the both ends of transmission shaft 2；2 top of transmission shaft is welded with the fixing seat 3 for stretching out 1 surface of testboard ontology, Gu
The upper surface of reservation 3 and the upper surface flush of testboard ontology 1, are provided with and ABS wheel speed sensors in 3 upper surface of fixing seat
The hub bearing 5 to match；Transmission shaft 2 is driven by being provided with motor 4, which is alternating current generator, and motor 4 passes through skin
Band driving transmission shaft 2 rotates；The oscillography for showing ABS wheel speed sensors output waveform is fixed in 1 bolt of testboard ontology
Device 6, the first passage and second channel of oscillograph 6 are respectively with data-interface 7 and with the data collector 8 of data-interface 7
It is connected；Meanwhile the power device 9(being also equipped in testboard ontology 1 for providing operating voltage for each electricity consumption mechanism is shown in
Fig. 3).For the harmonic filtration for exporting power device 9, power-supply filter 18(is connected in 9 output end of power device and sees Fig. 3), to subtract
The influence that small harmonic wave generates power grid.
In process of production or before product comes into the market, will ABS wheel speed sensors that production is completed be transported to it is of the invention
It is detected one by one by testboard, and non-defective unit and defective products is classified；When passive type ABS wheel speed sensors are detected
When, passive type ABS wheel speed sensors are installed on hub bearing 5, and are connected in insertion and the direct-connected data-interface 7 of oscillograph 6,
Starting motor 4 is to drive hub bearing 5 to be rotated, the proportional alternating voltage of passive type ABS wheel speed sensors inductive output,
The first passage of oscillograph 6 receives input signal and shows corresponding sinusoidal waveform；When active ABS wheel speed sensors carry out
When detection, active ABS wheel speed sensors are installed on hub bearing 5, and connect the data-interface on insertion data collector 8
In 7, start motor 4 to drive hub bearing 5 to be rotated, causes the change of active ABS wheel speed sensors output Hall voltage
Change, 8 collection voltages signal of data collector is delivered to the second channel of oscillograph 6, and oscillograph 6 shows corresponding square wave；Inspection
Whether survey person is correct by the waveform that observation oscilloscope 6 is shown, to judge whether the ABS wheel speed sensors are qualified product, to protect
Demonstrate,prove the qualification rate of the ABS wheel speed sensors to come into the market.
For the accuracy for further increasing detection, as shown in Figure 1 and Figure 2, testboard ontology 1 is gone back bolt and is fixed with for examining
The digital voltmeter 10 and ohmmeter 11 for surveying ABS wheel speed sensors output voltage, are fixed on the carbon brush holder of 2 side of transmission shaft
Carbon brush 14, and the carbon brush 14 fits in transmission shaft 2；And bakelite plate 19 is provided between transmission shaft 2 and testboard ontology 1,
Bolt for bearing block 22 is fixed on testboard ontology 1 after passing through bakelite plate 19, by transmission shaft 2 and testboard ontology 1
It is dielectrically separated from；Realized by circuit diagram as shown in Figure 4: ohmmeter 11 is used to detect the internal resistance R of ABS wheel speed sensors
And the earth impedance of ABS wheel speed sensors, when transmission shaft 2 drives hub bearing 5 to rotate, relay KM is powered, normally closed
Contact switch disconnects, and normally opened contact switch closure, the connecting line of carbon brush 14 is connected to the ground terminal of normally opened contact switch, so when
The earth impedance of the detection ABS wheel speed sensors of ohmmeter 11.When the velocity of rotation of transmission shaft 2 is 120 revs/min, output
Voltage is normally 0.8V or so, the detection by digital voltmeter 10 to ABS wheel speed sensors output voltage, to increase detection
Accuracy；And there are enameled wires in the shell of passive type ABS wheel speed sensors, and may result in enameled wire in production and processing
Short circuit occurs with shell, then passive type ABS wheel speed sensors are defective products, then passing through when being detected in the present invention
Ohmmeter 11 detects ground resistance to passive type ABS wheel speed sensors, and if qualified product, then ohmmeter 11 is shown as nothing
It is poor big；If short circuit occurs for enameled wire and shell, ohmmeter 11 shows resistance value, to detect passive type ABS wheel speed sensing
Whether device occurs short circuit, further increases the accuracy of ABS wheel speed sensors detection.
In the present invention, as shown in Figure 1, motor 4 is connected with rotating forward pedal 121 and reversion pedal for controlling positive and negative rotation
122, so that inspector controls the positive and negative rotation of motor 4 by trampling rotating forward pedal 121 respectively and inverting pedal 122, to drive
Hub bearing 5 carries out positive and negative rotation, and inspector of being more convenient for is operated.Meanwhile as shown in figure 3, the input terminal in motor 4 is coupled with
Frequency converter 13,13 bolt of frequency converter are fixed in testboard ontology 1, and frequency converter 13 has control panel 131, and the control panel
131 bolts are fixed on testboard ontology 1 towards inspector side, and inspector is according to the realities of the ABS wheel speed sensors of different model
Border needs, and the revolving speed of motor 4 is adjusted by control panel 131, improves the accuracy of measurement.To avoid frequency converter 13 to nearby setting
It is standby to generate interference, frequency converter 13 is isolated in an independent region by isolation board 17, to avoid causing other equipment
Interference, and cause detection inaccurate.
To check current revolving speed convenient for inspector, as shown in Figure 1 and Figure 2, it is fixed with and is used in 2 side bolt of transmission shaft
The speed probe 15 of 2 revolving speed of transmission shaft is detected, speed probe 15 exports rotary speed detecting signal, and 15 signal of speed probe connects
It is connected to revolving speed display module 16, revolving speed display module 16 shows tachometer value, the revolving speed display module 16 according to rotary speed detecting signal
For the display screen with independent control, and 16 bolt of revolving speed display module is fixed on testboard ontology 1 towards inspector one
Side；When inspector adjusts revolving speed, the more intuitive tachometer value for knowing currently to adjust is adjusted convenient for inspector.
To expand the adaptation range detected, as shown in Figure 1, being welded in 3 upper surface of fixing seat for stationary hub
Hub bearing 5 is fixed in fixing seat 3 by scroll chuck 20 by the scroll chuck 20 of bearing 5, when needing to detect different model
ABS wheel speed sensors when, can rapidly replace and the hub bearing 5 that ABS wheel speed sensors match need to be detected, to reach
The wider array of purpose of adaptation range.
For the frequent breakage for avoiding data-interface 7, sensed as shown in Figure 1, being connected on data-interface 7 with ABS wheel speed
The other end of signal wire 21 is directly connected with ABS wheel speed sensors when detecting, keeps away by the signal wire 21 that device matches
Exempt from repeatedly to generate plug with data-interface 7 and damage data-interface 7.
The above is only the preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment,
All technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
For those of ordinary skill, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (9)
1. a kind of ABS wheel speed sensors testboard, it is characterised in that: including testboard ontology (1), the testboard ontology (1)
It is rotatably connected to transmission shaft (2) vertically, transmission shaft (2) top is fixed with the fixing seat for stretching out testboard ontology (1) surface
(3), by being provided with motor (4) driving, fixing seat (3) upper surface is provided with to be sensed the transmission shaft (2) with ABS wheel speed
The hub bearing (5) that device matches, the testboard ontology (1) are provided with for showing ABS wheel speed sensors output waveform
Oscillograph (6), the oscillograph (6) are connected with data-interface (7) and have the data collector (8) of data-interface (7), institute
It states testboard ontology (1) and is additionally provided with power device (9) for providing operating voltage.
2. a kind of ABS wheel speed sensors testboard according to claim 1, it is characterised in that: the testboard ontology (1)
It is additionally provided with the digital voltmeter (10) for detecting ABS wheel speed sensors output voltage and ohmmeter (11), the transmission shaft
(2) side is provided with carbon brush (14), and the carbon brush (14) fits in transmission shaft (2), the transmission shaft (2) and testboard ontology
(1) it is provided between bakelite plate (19), the ohmmeter (11) is used to detect the internal resistance and ABS of ABS wheel speed sensors
The earth impedance of wheel speed sensors；When transmission shaft (2) drive hub bearing (5) rotation, ohmmeter (11) detects ABS wheel speed and passes
The earth impedance of sensor.
3. a kind of ABS wheel speed sensors testboard according to claim 2, it is characterised in that: the motor (4) is connected with
For controlling rotating forward pedal (121) and reversion pedal (122) of positive and negative rotation.
4. a kind of ABS wheel speed sensors testboard according to claim 3, it is characterised in that: the input of the motor (4)
End is coupled with frequency converter (13), and the frequency converter (13) has control panel (131).
5. a kind of ABS wheel speed sensors testboard according to claim 4, it is characterised in that: the frequency converter (13) is logical
It crosses and is provided with isolation board (17) and is individually isolated.
6. a kind of ABS wheel speed sensors testboard according to claim 5, it is characterised in that: power device (9) output
End is connected with power-supply filter (18).
7. a kind of ABS wheel speed sensors testboard according to claim 4, it is characterised in that: transmission shaft (2) side
It is provided with the speed probe (15) for detecting transmission shaft (2) revolving speed, speed probe (15) the output Rotating speed measring letter
Number, speed probe (15) signal is connected with revolving speed display module (16), and the revolving speed display module (16) is according to revolving speed
It detects signal and shows tachometer value.
8. a kind of ABS wheel speed sensors testboard according to claim 1, it is characterised in that: table on the fixing seat (3)
Face is fixed with the scroll chuck (20) for stationary hub bearing (5).
9. a kind of ABS wheel speed sensors testboard according to claim 1, it is characterised in that: the data-interface (7) is even
It is connected to the signal wire (21) to match with ABS wheel speed sensors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711331501.8A CN109917149A (en) | 2017-12-13 | 2017-12-13 | A kind of ABS wheel speed sensors testboard |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711331501.8A CN109917149A (en) | 2017-12-13 | 2017-12-13 | A kind of ABS wheel speed sensors testboard |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109917149A true CN109917149A (en) | 2019-06-21 |
Family
ID=66959129
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711331501.8A Pending CN109917149A (en) | 2017-12-13 | 2017-12-13 | A kind of ABS wheel speed sensors testboard |
Country Status (1)
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| CN101769940A (en) * | 2009-12-24 | 2010-07-07 | 宁波市北仑恒铁机电制造有限公司 | Novel test device of photoelectric revolution speed transducer |
| CN201607456U (en) * | 2009-12-24 | 2010-10-13 | 宁波市北仑恒铁机电制造有限公司 | Novel testing device for photoelectric speed sensor |
| CN201819917U (en) * | 2010-09-27 | 2011-05-04 | 重庆聚能汽车技术有限责任公司 | Automobile detection and analysis system with wheel speed sensor |
| CN202281629U (en) * | 2011-09-23 | 2012-06-20 | 杭州临安天隆电子有限公司 | ABS (Anti-lock Braking System) sensor testboard |
| CN106324288A (en) * | 2016-09-28 | 2017-01-11 | 苏州科技大学 | Wheel speed sensor testing apparatus and testing method |
| CN205910217U (en) * | 2016-08-26 | 2017-01-25 | 湖南吉盛国际动力传动系统有限公司 | Automatic simple and easy check out test set of speedtransmitter for derailleur |
| CN106370890A (en) * | 2016-08-19 | 2017-02-01 | 宁波中车时代传感技术有限公司 | Device capable of performing speed sensor performance testing in three integrated test conditions |
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2017
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Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5780732A (en) * | 1994-08-30 | 1998-07-14 | Wabco Vermogensverwaltungs Gmbh | Method for the verification of electrical connections for an antilock braking system of a vehicle |
| CN201477112U (en) * | 2009-07-27 | 2010-05-19 | 升德升(连云港)电子有限公司 | Character detector of wheel speed sensor |
| CN101769940A (en) * | 2009-12-24 | 2010-07-07 | 宁波市北仑恒铁机电制造有限公司 | Novel test device of photoelectric revolution speed transducer |
| CN201607456U (en) * | 2009-12-24 | 2010-10-13 | 宁波市北仑恒铁机电制造有限公司 | Novel testing device for photoelectric speed sensor |
| CN201819917U (en) * | 2010-09-27 | 2011-05-04 | 重庆聚能汽车技术有限责任公司 | Automobile detection and analysis system with wheel speed sensor |
| CN202281629U (en) * | 2011-09-23 | 2012-06-20 | 杭州临安天隆电子有限公司 | ABS (Anti-lock Braking System) sensor testboard |
| CN106370890A (en) * | 2016-08-19 | 2017-02-01 | 宁波中车时代传感技术有限公司 | Device capable of performing speed sensor performance testing in three integrated test conditions |
| CN205910217U (en) * | 2016-08-26 | 2017-01-25 | 湖南吉盛国际动力传动系统有限公司 | Automatic simple and easy check out test set of speedtransmitter for derailleur |
| CN106324288A (en) * | 2016-09-28 | 2017-01-11 | 苏州科技大学 | Wheel speed sensor testing apparatus and testing method |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190621 |