CN201796042U - Self-adapting vehicle speed sensor - Google Patents
Self-adapting vehicle speed sensor Download PDFInfo
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- CN201796042U CN201796042U CN2010201617735U CN201020161773U CN201796042U CN 201796042 U CN201796042 U CN 201796042U CN 2010201617735 U CN2010201617735 U CN 2010201617735U CN 201020161773 U CN201020161773 U CN 201020161773U CN 201796042 U CN201796042 U CN 201796042U
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- hall element
- vehicle speed
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- speed sensor
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Abstract
The utility model relates to a self-adapting vehicle speed sensor, which comprises a hall element, a switching circuit and a microprocessor. The hall element, the microprocessor and the switching circuit are sequentially arranged on a circuit board; the switching circuit is connected with an automobile instrument; a signal generated by the hall element is transmitted to the microprocessor; the microprocessor is used for correcting the duty ratio of the signal to generate a pulse width modulation signal; and the pulse width modulation signal controls the switching circuit to generate an output signal with a 50% duty ratio and transmit the output signal to the automobile instrument. The self-adapting vehicle speed sensor is capable of greatly improving qualification rate of vehicle speed sensors.
Description
Technical field
The utility model relates to vehicle speed sensor, relates in particular to a kind of self-adaptation vehicle speed sensor.
Background technology
Hall element is the electronic component that utilizes Hall effect, when so-called Hall effect is meant the charge carrier of the action of a magnetic field in current-carrying metallic conductor, semiconductor, produces the physical phenomenon of transverse electric potential difference.
The principle of Hall vehicle speed sensor is: the electronic switch of integrated hall element is installed on the speed measuring position, when being become the magnetic induction density on Hall switch surface by the structural reform that tests the speed and surpassing certain threshold values, the Hall switch output signal will be produced switch; By the number of times that tracer signal is switched, can measure the speed of the body that tested the speed.
Fixed shaft type Hall vehicle speed sensor is fixed on the surface of magnet steel (being permanent magnet) with Hall element, and the square-wave signal of described Hall element output directly sends to automobile instrument by on-off circuit, is shown as the speed of a motor vehicle and the mileage information of automobile.Angle from technical requirement, the dutycycle of the square-wave signal that described automobile instrument collects will be about 50%, and the square-wave signal of Hall element output is owing to be subjected to the influence of the position of the relative magnet steel of Hall element to be difficult to reach the dutycycle requirement, the pulse signal of Hall element output is directly sent to automobile instrument be difficult for reaching the automobile instrument technical requirement, therefore, in the prior art, the qualification rate of producing fixed shaft type Hall vehicle speed sensor is not high.
The utility model content
The purpose of this utility model is to provide a kind of self-adaptation vehicle speed sensor, can be automatically the dutycycle of the square-wave signal of Hall element output be proofreaied and correct, and improves product percent of pass.
To achieve the above object, the utility model provides a kind of self-adaptation vehicle speed sensor, comprises Hall element, on-off circuit and microprocessor; Described Hall element, microprocessor and on-off circuit are arranged on the circuit board successively; Described on-off circuit is connected with automobile instrument; The signal that described Hall element produces sends to described microprocessor, described microprocessor carries out duty cycle correction to this signal, produce a pulse width modulating signal, it is that 50% output signal sends to automobile instrument that this pulse width modulating signal gauge tap circuit produces dutycycle.
Above-mentioned self-adaptation vehicle speed sensor, wherein, described Hall element is the difference Hall element.
Above-mentioned self-adaptation vehicle speed sensor, wherein, the signal of described Hall element output is a square-wave signal.
Above-mentioned self-adaptation vehicle speed sensor, wherein, described on-off circuit is the MOSFET device.
The utility model self-adaptation vehicle speed sensor, microprocessor can be automatically proofreaied and correct the dutycycle of the output signal of Hall element, making the signal of on-off circuit output reach dutycycle is 50% requirement, therefore, the dutycycle of this self-adaptation vehicle speed sensor output signal no longer is subjected to the influence of the position of the relative magnet steel of Hall element, this self-adaptation vehicle speed sensor can self-adaptation satisfy technical requirement, has improved product percent of pass greatly;
The utility model self-adaptation vehicle speed sensor owing to microprocessor output pwm signal gauge tap circuit, can improve the performance of this self-adaptation vehicle speed sensor;
The utility model self-adaptation vehicle speed sensor, simple and reliable to the method that signal dutyfactor is proofreaied and correct.
Description of drawings
Self-adaptation vehicle speed sensor of the present utility model is provided by following embodiment and accompanying drawing.
Fig. 1 is the structural representation of the utility model self-adaptation vehicle speed sensor.
Fig. 2 is the process flow diagram that microprocessor carries out the method for duty cycle correction in the utility model to described hall element output signal.
Fig. 3 is the synoptic diagram of the utility model hall element output signal.
Embodiment
Below with reference to Fig. 1～Fig. 3 self-adaptation vehicle speed sensor of the present utility model is described in further detail.
The utility model self-adaptation vehicle speed sensor comprises Hall element and on-off circuit, it is characterized in that, also comprises microprocessor;
Described Hall element, microprocessor and on-off circuit are arranged on the circuit board successively;
Described on-off circuit is connected with automobile instrument;
The signal that described Hall element produces sends to described microprocessor, described microprocessor carries out duty cycle correction to this signal, produce a pulse width modulating signal, it is that 50% output signal sends to automobile instrument that this pulse width modulating signal gauge tap circuit produces dutycycle.
Referring to Fig. 1, self-adaptation vehicle speed sensor of the present utility model comprises Hall element 10, microprocessor 20 and on-off circuit 30;
Described Hall element 10, microprocessor 20 and on-off circuit 30 are arranged on the circuit board (not shown) successively;
Described Hall element 10, microprocessor 20 and on-off circuit 30 all are connected with power supply;
Described on-off circuit 30 is connected with the automobile instrument (not shown).
Described Hall element 10 is fixed on the magnet steel surface, described magnet steel produces a magnetic field on described Hall element 10 surfaces, alternation takes place in this magnetic field under the signal wheel of wheel box triggers, thereby make described Hall element 10 produce signal, the signal that described Hall element 10 produces sends to described microprocessor 20,20 pairs of these signals of described microprocessor carry out duty cycle correction, produce a pulse-length modulation (Pulse WidthModulation, PWM) it is that 50% output signal sends to automobile instrument that signal, this pwm signal gauge tap circuit 30 produce dutycycles.
Described Hall element 10 is the difference Hall element.
The signal of described Hall element 10 outputs is a square-wave signal.
Described on-off circuit 30 is the MOSFET device.
The microprocessor of self-adaptation vehicle speed sensor of the present utility model can be automatically proofreaied and correct the dutycycle of the output signal of Hall element, making the signal of on-off circuit output reach dutycycle is 50% requirement, therefore, the dutycycle of this self-adaptation vehicle speed sensor output signal no longer is subjected to the influence of the position of the relative magnet steel of Hall element, this self-adaptation vehicle speed sensor can self-adaptation satisfy technical requirement, has improved product percent of pass greatly.
Self-adaptation vehicle speed sensor of the present utility model can improve the performance of this self-adaptation vehicle speed sensor owing to microprocessor output pwm signal gauge tap circuit.
Referring to Fig. 2, above-mentioned microprocessor comprises step to the method that described hall element output signal carries out duty cycle correction:
Step 1, microprocessor begin to receive the output signal of Hall element;
Step 2, the time that microprocessor records signal rising edge triggers is as the moment t1 among Fig. 3;
Step 3, the time that microprocessor records next signal rising edge triggers is as the moment t2 among Fig. 3;
Step 4, poor between the time of the time of microprocessor calculation procedure 3 records and step 2 record, promptly t2-t1 after calculating is good, carries out step 5 and step 6 simultaneously;
Step 5 is got back to step 2, carries out the processing of next cycle;
Step 6, microprocessor are carried out two frequencys multiplication and are calculated;
Step 7, the microprocessor output pwm signal, and be sent to on-off circuit.
Claims (4)
1. a self-adaptation vehicle speed sensor comprises Hall element and on-off circuit, it is characterized in that, also comprises microprocessor;
Described Hall element, microprocessor and on-off circuit are arranged on the circuit board successively;
Described on-off circuit is connected with automobile instrument;
The signal that described Hall element produces sends to described microprocessor, described microprocessor carries out duty cycle correction to this signal, produce a pulse width modulating signal, it is that 50% output signal sends to automobile instrument that this pulse width modulating signal gauge tap circuit produces dutycycle.
2. self-adaptation vehicle speed sensor as claimed in claim 1 is characterized in that, described Hall element is the difference Hall element.
3. self-adaptation vehicle speed sensor as claimed in claim 1 is characterized in that, the signal of described Hall element output is a square-wave signal.
4. self-adaptation vehicle speed sensor as claimed in claim 1 is characterized in that, described on-off circuit is the MOSFET device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201617735U CN201796042U (en) | 2010-04-16 | 2010-04-16 | Self-adapting vehicle speed sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201617735U CN201796042U (en) | 2010-04-16 | 2010-04-16 | Self-adapting vehicle speed sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201796042U true CN201796042U (en) | 2011-04-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201617735U Expired - Lifetime CN201796042U (en) | 2010-04-16 | 2010-04-16 | Self-adapting vehicle speed sensor |
Country Status (1)
| Country | Link |
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| CN (1) | CN201796042U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102221630A (en) * | 2010-04-16 | 2011-10-19 | 上海森太克汽车电子有限公司 | Adaptive speed sensor and signal duty ratio correction method |
| CN108226564A (en) * | 2016-12-30 | 2018-06-29 | 广州市华泽科技有限公司 | A kind of radio-type vehicle speed sensor |
| 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 |
-
2010
- 2010-04-16 CN CN2010201617735U patent/CN201796042U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102221630A (en) * | 2010-04-16 | 2011-10-19 | 上海森太克汽车电子有限公司 | Adaptive speed sensor and signal duty ratio correction method |
| CN108226564A (en) * | 2016-12-30 | 2018-06-29 | 广州市华泽科技有限公司 | A kind of radio-type vehicle speed sensor |
| 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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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110413 |
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| CX01 | Expiry of patent term |