CN208636336U - A kind of vehicle-wheel speed sensor - Google Patents
A kind of vehicle-wheel speed sensor Download PDFInfo
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- CN208636336U CN208636336U CN201821230922.1U CN201821230922U CN208636336U CN 208636336 U CN208636336 U CN 208636336U CN 201821230922 U CN201821230922 U CN 201821230922U CN 208636336 U CN208636336 U CN 208636336U
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- circuit
- switch chip
- hall element
- vehicle
- speed sensor
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Abstract
The utility model provides a kind of vehicle-wheel speed sensor, the vehicle-wheel speed sensor includes: Hall element and signal processing circuit board, signal processing circuit board includes: the Hall element detection circuit connecting with Hall element, output circuit and triggering selection circuit and burning voltage signal circuit and switch chip compared with the connection of Hall element detection circuit；Wherein, burning voltage signal circuit and compare the input terminal of output circuit and switch chip and connect；The output end of triggering selection circuit and the control terminal of switch chip connect；Switch chip when triggering selection circuit detects square wave, compare output circuit and be connected to the output end of switch chip by control；When square wave is not detected, control burning voltage signal circuit is connected to the output end of switch chip.The beneficial effects of the utility model are: can test whether wheel disc acts with automatic identification, and sensor is made to export burning voltage signal when test senses that test wheel disc does not act, to improve the accuracy that inspection tests the speed to wheel.
Description
Technical field
The utility model relates to arrive technical field of rail traffic more particularly to a kind of vehicle-wheel speed sensor.
Background technique
Velocity sensor is a kind of electric locomotive commonly sensor of non-contact detecting revolving speed.On the rail vehicle, vehicle
The stability of system be heavily dependent on it collected speed signal reliability and precision, and speed collected
Degree signal includes the variable quantity of current speed value and speed.In the traction control of locomotive, wheel skid protection and Train Control mistake
It will be related to the acquisition problems of speed signal in journey.Wherein hall vehicle-wheel speed sensor output signal is square wave, wheel
For velocity sensor when testing wheel disc stopping, output signal low and high level is uncertain, is easy to keep acquisition system dynamic in the presence of erroneous judgement
Make, leads to car accident.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, provide a kind of vehicle-wheel speed sensor.
The utility model is achieved through the following technical solutions:
The utility model provides a kind of vehicle-wheel speed sensor, which includes: Hall element, and letter
Number processing circuit plate, the signal processing circuit board includes: the Hall element detection circuit connecting with the Hall element, with institute
State the comparison output circuit and burning voltage signal circuit, switch chip and triggering selection of the connection of Hall element detection circuit
Circuit；Wherein, the burning voltage signal circuit and the relatively output circuit are connect with the input terminal of the switch chip；Institute
The input terminal for stating triggering selection circuit is connect with the Hall element detection circuit, and the output end of the triggering selection circuit with
The control terminal of the switch chip connects；Wherein,
The triggering selection circuit is for detecting whether Hall element detection circuit exports square wave；The switch chip is in institute
When stating triggering selection circuit and detecting square wave, controls the relatively output circuit and be connected to the output end of the switch chip；?
When square wave is not detected, controls the burning voltage signal circuit and be connected to the output end of the switch chip.
It preferably, further include the filtering output circuit being connect with the output end of the switch chip.
Preferably, the switch chip is single-pole double-throw switch (SPDT) chip.
Preferably, the relatively output circuit is track to track output circuit.
It preferably, further include sensor housing, the hall device and signal processing circuit board are arranged in the sensing
In device shell.
Preferably, the triggering selection circuit is the repeatable triggering both monostables of binary channels.
The beneficial effects of the utility model are: can test whether wheel disc acts with automatic identification, and testing sensor
It senses and exports burning voltage signal when test wheel disc does not act, to improve the accuracy that inspection tests the speed to wheel.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of vehicle-wheel speed sensor provided by the embodiment of the utility model；
Fig. 2 is vehicle-wheel speed sensor electrical block diagram provided by the embodiment of the utility model；
Fig. 3 is the circuit diagram of triggering selection circuit provided by the embodiment of the utility model；
Fig. 4 is the switch chip functional diagram of vehicle-wheel speed sensor provided by the embodiment of the utility model；
Fig. 5 is the waveform diagram of trigger circuit provided by the embodiment of the utility model.
Specific embodiment
Hereinafter, certain exemplary embodiments are simply just described.As one skilled in the art will recognize that
Like that, without departing from the spirit or scope of the present utility model, it can be modified by various different modes described real
Apply example.Therefore, attached drawing and description are considered essentially illustrative rather than restrictive.
In the description of the present invention, it should be understood that term " center ", " longitudinal direction ", " transverse direction ", " length ", " width
Degree ", " thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside",
The orientation or positional relationship of the instructions such as " clockwise ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " is based on the figure
Orientation or positional relationship is merely for convenience of describing the present invention and simplifying the description, rather than the dress of indication or suggestion meaning
It sets or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as to the utility model
Limitation.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more of the features.The meaning of " plurality " is two or two in the description of the present invention,
More than, unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " Gu
It is fixed " etc. terms shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be
Mechanical connection, is also possible to be electrically connected, can also be communication；It can be directly connected, the indirect phase of intermediary can also be passed through
Even, the connection inside two elements or the interaction relationship of two elements be can be.For those of ordinary skill in the art
For, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
In the present invention unless specifically defined or limited otherwise, fisrt feature the "upper" of second feature or it
"lower" may include that the first and second features directly contact, and also may include that the first and second features are not direct contacts but lead to
Cross the other characterisation contact between them.Moreover, fisrt feature second feature " on ", " side " and " above " include first
Feature is right above second feature and oblique upper, or is merely representative of first feature horizontal height higher than second feature.Fisrt feature
It under the second feature " below ", " below " and " below " include fisrt feature right above second feature and oblique upper, or only table
Show that first feature horizontal height is less than second feature.
Following disclosure provides many different embodiments or example is used to realize the different structure of the utility model.
In order to simplify the disclosure of the utility model, hereinafter the component of specific examples and setting are described.Certainly, they are only
Example, and purpose does not lie in limitation the utility model.In addition, the utility model can in different examples repeat reference numerals
And/or reference letter, this repetition are for purposes of simplicity and clarity, itself not indicate discussed various embodiments
And/or the relationship between setting.In addition, the example of various specific techniques and material that the utility model provides, but this
Field those of ordinary skill can be appreciated that the application of other techniques and/or the use of other materials.
Fig. 1 and Fig. 2 is please referred to, Fig. 1 is a kind of structural schematic diagram of vehicle-wheel speed sensor provided by the utility model, figure
2 be vehicle-wheel speed sensor electrical block diagram provided by the embodiment of the utility model.
The utility model embodiment provides a kind of vehicle-wheel speed sensor, which includes: Hall member
Part 13 and signal processing circuit board 14, the signal processing circuit board 14 include: the Hall member connecting with the Hall element 13
Part detection circuit 21, output circuit 26 and burning voltage signal electricity compared with the Hall element detection circuit 21 connection
Road 27, switch chip 23 and triggering selection circuit 22；Wherein, the burning voltage signal circuit and the relatively output circuit 26
It is connect with the input terminal of the switch chip 23；The input terminal of the triggering selection circuit 22 and the Hall element detection circuit
21 connections, and the output end of the triggering selection circuit 22 is connect with the control terminal of the switch chip 23；Wherein,
The triggering selection circuit 22 is for detecting whether Hall element detection circuit 21 exports square wave；The switch chip
23 when the triggering selection circuit 22 detects square wave, and the control relatively output circuit 26 is defeated with the switch chip 23
Outlet connection；When square wave is not detected, the output end of the burning voltage signal circuit 27 and the switch chip 23 is controlled
Connection.
It preferably, further include the filtering output circuit 24 being connect with the output end of the switch chip 23.
Preferably, the switch chip 23 is single-pole double-throw switch (SPDT) chip 23.
Preferably, the relatively output circuit 26 is track to track output circuit.
It preferably, further include sensor housing 12, the hall device and signal processing circuit board 14 are arranged described
In sensor housing 12.
Preferably, the triggering selection circuit 22 is the repeatable triggering both monostables of binary channels.
The signal processing circuit board 14 further includes hall device detection circuit 21, and the hall device detection circuit 21
Input terminal connect with the Hall element 13, output circuit 26 and triggering selection circuit 22 connect output end compared with described respectively
It connects.
In the above-described embodiments, it can test whether wheel disc acts with automatic identification, and sensor is made to sense survey in test
Examination wheel disc exports burning voltage signal when not acting, to improve the accuracy that inspection tests the speed to wheel.
In order to facilitate a kind of vehicle-wheel speed sensor provided by the embodiment of the utility model is understood, below with reference to specific reality
Example is applied it is described in detail.
It continuing to refer to figure 1, the utility model provides a kind of vehicle-wheel speed sensor, for measuring locomotive vehicle wheel rotational speed,
It is installed on locomotive wheel shaft end, is arranged with test wheel disc relative proximity, as shown in Figure 1, the vehicle-wheel speed sensor includes: sensing
Device shell 12 is arranged in Hall element 13 and signal processing circuit board 14 in sensor housing 12, further includes and the signal
The transmission cable 15 and connector plug 16 that processing circuit plate 14 connects, wherein the sensor outer housing 12 is non-magnet material system
At shell, thus by Hall element 13 and signal processing circuit board 14 package and bulk shielding, transmission cable 15 using screen
Cable is covered, and the outer layer of shielded cable is made shell with non-magnetic material and is connected.To improve the electromagnetic environment of entire signal,
Reduce extraneous interference.
When specifically used, as shown in fig. 1, vehicle-wheel speed sensor is installed on locomotive wheel shaft end, with test wheel disc
11 relative proximities setting, sensor housing 12 are connected by fixing bolt with base, Hall element 13 and signal processing circuit board
14 have sensor housing 12 to be connected, the signal that transmission cable 15 and connector plug 16 complete the processing of signal processing circuit board 14
With external connection.
Together referring to Figure 1 and Figure 2, which includes Hall element detection circuit 21, triggering selection electricity
Output circuit 26 and burning voltage signal electricity, filtering output circuit 24, power supply processing circuit 25, are compared at switch chip 23 in road 22
Road 27.The switch chip 23 is single-pole double-throw switch (SPDT) chip.When testing the rotation of wheel disc 11, Hall element detection circuit 21 will suddenly
The turn signal for the test wheel disc 11 that your element 13 is tested is converted into square-wave signal and is sent to triggering selection circuit 22 and more defeated
Circuit 26 out, the comparison output circuit 26 are track to track output circuit, and triggering selection circuit 22 exports after receiving square-wave signal
High level signal (default is low level signal) gives switch chip 23, and the SB inside switch chip 23 is connected with D, more defeated
Circuit 26 will will normally be input to filtering output circuit 24, output after the square-wave signal received processing by switch chip 23 out
Filtering output circuit 24 exports after signal is filtered.When testing wheel disc stopping, the test of Hall element detection circuit 21 is arrived
Test wheel disc signal (high level or low level) be sent to triggering selection circuit 22 and compare output circuit 26, triggering selection electricity
Road 22 does not receive square wave trigger signal, and low level signal is exported after T time to switch chip 23, inside switch chip 23
SA is connected with D, and the burning voltage signal that burning voltage signal circuit 27 exports is input to output filtering by switch chip 23
Output circuit 24, output filtering output circuit 24 export after signal is filtered.Power supply processing circuit 25 passes through external power supply
Other circuits are supplied to after crossing filtering and anti-reverse processing.
Further, as shown in figure 3, triggering selection circuit is the repeatable triggering both monostables of binary channels, menu
As shown in Figure 4.Regular block signal is input to the 1st tunnel monostable A1 pin by current-limiting resistance R1, while being input to the 2nd road list
No. 2 monostable flipflop Reset1 pins and Reset2 pin are accessed high level simultaneously, the 1st tunnel are touched by the B2 pin of stable state
It sends out device B1 pin and accesses high level, No. 2nd trigger A2 pin is accessed into low level.Two-way monostable flipflop Q1 and Q2 are led to
It crosses and OR circuit progress or processing is formed by D3, D4 and R4.
Further, as shown in figure 5, when square-wave signal occurs, rising edge and failing edge can trigger monostable all the way
State work, makes its end Q export high level, and high level lasting time is determined by the circuit that D1, R2 and C1 or D2, R3 and C2 are formed
Fixed, delay time calculation formula is T=0.2RX × CX.Because signal input part do not know its rising edge and failing edge into suitable
Sequence, in order to lose final output waveform not, by two-way monostable flipflop output Q value carry out or processing, make its rising edge and
Failing edge signal can be handled in time.
The vehicle-wheel speed sensor includes: Hall element and signal processing circuit board, signal processing circuit board include: with
The comparison output circuit and burning voltage signal circuit, switch chip and triggering selection circuit of Hall element connection；Wherein,
Burning voltage signal circuit and the input terminal connection for comparing output circuit and switch chip；The input terminal of triggering selection circuit with suddenly
You connect element, and the control terminal of the output end of triggering selection circuit and switch chip connects；Wherein,
Triggering selection circuit is for detecting whether Hall element exports square wave；Switch chip is detected in triggering selection circuit
When square wave, control is compared output circuit and is connected to the output end of switch chip；When square wave is not detected, control burning voltage letter
Number circuit is connected to the output end of switch chip.
It can be seen from the above description that the vehicle-wheel speed sensor can test whether wheel disc acts with automatic identification, and
Sensor is set to export burning voltage signal when test senses that test wheel disc does not act, to improve what inspection tested the speed to wheel
Accuracy.
The above is only the preferred embodiments of the present utility model only, is not intended to limit the utility model, all practical at this
Made any modifications, equivalent replacements, and improvements etc., should be included in the guarantor of the utility model within novel spirit and principle
Within the scope of shield.
Claims (6)
1. a kind of vehicle-wheel speed sensor characterized by comprising Hall element and signal processing circuit board, at the signal
Managing circuit board includes: the Hall element detection circuit connecting with the Hall element, is connect with the Hall element detection circuit
Comparison output circuit and burning voltage signal circuit, switch chip and triggering selection circuit；Wherein, the burning voltage
Signal circuit and the relatively output circuit are connect with the input terminal of the switch chip；The input terminal of the triggering selection circuit
It is connect with the Hall element detection circuit, and the control terminal of the output end of the triggering selection circuit and the switch chip connects
It connects；Wherein,
The triggering selection circuit is for detecting whether Hall element detection circuit exports square wave；The switch chip is in the touching
When hair selection circuit detects square wave, controls the relatively output circuit and be connected to the output end of the switch chip；It is not examining
When measuring square wave, controls the burning voltage signal circuit and be connected to the output end of the switch chip.
2. vehicle-wheel speed sensor according to claim 1, which is characterized in that further include the output with the switch chip
Hold the filtering output circuit of connection.
3. vehicle-wheel speed sensor according to claim 2, which is characterized in that the switch chip is single-pole double-throw switch (SPDT)
Chip.
4. vehicle-wheel speed sensor according to claim 1, which is characterized in that the relatively output circuit is that track to track is defeated
Circuit out.
5. vehicle-wheel speed sensor according to claim 1, which is characterized in that it further include sensor housing, the Hall
Device and signal processing circuit board are arranged in the sensor shell body.
6. vehicle-wheel speed sensor according to claim 5, which is characterized in that the triggering selection circuit is that binary channels can
Repeated trigger both monostables.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821230922.1U CN208636336U (en) | 2018-08-01 | 2018-08-01 | A kind of vehicle-wheel speed sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821230922.1U CN208636336U (en) | 2018-08-01 | 2018-08-01 | A kind of vehicle-wheel speed sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208636336U true CN208636336U (en) | 2019-03-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201821230922.1U Active CN208636336U (en) | 2018-08-01 | 2018-08-01 | A kind of vehicle-wheel speed sensor |
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| Country | Link |
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| CN (1) | CN208636336U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109030853A (en) * | 2018-08-01 | 2018-12-18 | 长沙七维传感技术有限公司 | A kind of vehicle-wheel speed sensor |
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2018
- 2018-08-01 CN CN201821230922.1U patent/CN208636336U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109030853A (en) * | 2018-08-01 | 2018-12-18 | 长沙七维传感技术有限公司 | A kind of vehicle-wheel speed sensor |
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