CN203190986U - Vehicle frequency signal acquisition circuit - Google Patents
Vehicle frequency signal acquisition circuit Download PDFInfo
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- CN203190986U CN203190986U CN2013202325742U CN201320232574U CN203190986U CN 203190986 U CN203190986 U CN 203190986U CN 2013202325742 U CN2013202325742 U CN 2013202325742U CN 201320232574 U CN201320232574 U CN 201320232574U CN 203190986 U CN203190986 U CN 203190986U
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- capacitor
- diode
- frequency signal
- acquisition circuit
- signal acquisition
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- 239000003990 capacitor Substances 0.000 claims description 29
- 239000000523 sample Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
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Abstract
A vehicle frequency signal acquisition circuit belongs to the field of vehicle control circuits. The vehicle frequency signal acquisition circuit aims to solve problems that a conventional frequency signal acquisition circuit of a vehicle speed sensor is high in cost and poor in reliability. The vehicle frequency signal acquisition circuit comprises an R1, an R2, an R3, an R4, a diode RD1, a diode RD2, a C1, a C2, a C3 and a transistor KT1. The cathode of the RD1 is connected to an output end of a vehicle speed or rotating speed sensor, and the anode of the RD1 is simultaneously connected to one end of the R1, the anode of the RD2 and one end of the C1; the other end of the R1 is connected to a power supply (+12V); the cathode of the RD2 is connected to one end of the R2, and the other end of the R2 is simultaneously connected to one end of the R3, one end of the C2 and the base electrode of the KT1; the emitting electrode of the KT1 is simultaneously connected to the other end of the C1, the other end of the R3, the other end of the C2 and one end of the C3, and is connected to the ground; an AD port of a single-chip microcomputer is simultaneously connected to the collecting electrode of the KT1, one end of the R4 and the other end of the C3; and the other end of the R4 is connected to a power supply (+5V).
Description
Technical field
The utility model relates to automobile-used frequency signal Acquisition Circuit, belongs to the automotive control circuit field.
Background technology
The speed of a motor vehicle or tach signal on the automobile all is to utilize the speed of a motor vehicle or speed probe to convert the frequency pulse signal at present, because the electromagnetic environment complexity on the automobile, disturb big, whether the accuracy of the collection of vehicle speed signal affects the counting of mileage and can drive over the speed limit, so the reliable collection of vehicle speed signal is a very important problem.In addition, vehicle price constantly reduces now, causes the price of used each parts of automobile also descending, so should consider reliability of products when design, consider the design cost of circuit again, cost height, the poor reliability of the frequency signal Acquisition Circuit of existing car speed sensor.
Summary of the invention
The utility model purpose is to have now at the cost height of the frequency signal Acquisition Circuit of car speed sensor, the problem of poor reliability in order to solve, and a kind of automobile-used frequency signal Acquisition Circuit is provided.
Automobile-used frequency signal Acquisition Circuit described in the utility model, it comprises resistance R 1, resistance R 2, resistance R 3, resistance R 4, diode RD1, diode RD2, capacitor C 1, capacitor C 2, capacitor C 3 and triode KT1,
The negative electrode of diode RD1 connects the output terminal of the speed of a motor vehicle or speed probe, and the anode of diode RD1 connects an end of resistance R 1, the anode of diode RD2 and an end of capacitor C 1 simultaneously;
Other end connection+12V the power supply of resistance R 1;
The negative electrode of diode RD2 connects an end of resistance R 2, and the other end of resistance R 2 connects an end of resistance R 3, an end of capacitor C 2 and the base stage of triode KT1 simultaneously;
The emitter of triode KT1 connects the other end of capacitor C 1, the other end of resistance R 3, the other end of capacitor C 2 and an end of capacitor C 3 simultaneously, and ground connection;
One end of the collector of triode KT1, resistance R 4 and the other end of capacitor C 3 are connected the AD port of single-chip microcomputer simultaneously; Other end connection+5V the power supply of resistance R 4.
Advantage of the present utility model: the utility model is a kind of reliability height, and is simple in structure, and cost is low circuit again.The dirigibility height.
Description of drawings
Fig. 1 is the circuit diagram of automobile-used frequency signal Acquisition Circuit described in the utility model.
Embodiment
Embodiment one: present embodiment is described below in conjunction with Fig. 1, the described automobile-used frequency signal Acquisition Circuit of present embodiment, it comprises resistance R 1, resistance R 2, resistance R 3, resistance R 4, diode RD1, diode RD2, capacitor C 1, capacitor C 2, capacitor C 3 and triode KT1
The negative electrode of diode RD1 connects the output terminal of the speed of a motor vehicle or speed probe, and the anode of diode RD1 connects an end of resistance R 1, the anode of diode RD2 and an end of capacitor C 1 simultaneously;
Other end connection+12V the power supply of resistance R 1;
The negative electrode of diode RD2 connects an end of resistance R 2, and the other end of resistance R 2 connects an end of resistance R 3, an end of capacitor C 2 and the base stage of triode KT1 simultaneously;
The emitter of triode KT1 connects the other end of capacitor C 1, the other end of resistance R 3, the other end of capacitor C 2 and an end of capacitor C 3 simultaneously, and ground connection;
One end of the collector of triode KT1, resistance R 4 and the other end of capacitor C 3 are connected the AD port of single-chip microcomputer simultaneously;
Other end connection+5V the power supply of resistance R 4.
The speed of a motor vehicle on the automobile and tach signal adopt the frequency pulse signal more, it is 50% square-wave signal that the pulse signal of the speed of a motor vehicle or speed probe is generally dutycycle, the low level scope is≤0.5V, high level voltage 〉=5V, frequency range is between 0-10kV, when A point input voltage when low, the B point voltage is dragged down, because of RD1 identical with the tube voltage drop of RD2, so the C point is identical with the A point voltage, resistance R 2 and resistance R 3 dividing potential drops, the D point voltage is the cut-in voltage less than triode, triode KT1 ends, the E point voltage by on move 5V to, that single-chip microcomputer is adopted is high level (5V), and when A point input voltage when being high, the B point voltage is high, the D point voltage is higher than the cut-in voltage of triode, triode KT1 conducting, the E point voltage pulled down to close to 0V, and what single-chip microcomputer was adopted is low level.
The effect of diode RD1 is to prevent that the external voltage of importing from causing interference to builtin voltage, the effect of diode RD2 prevents that system voltage is anti-and signal source is caused interference partially the time, C1 carries out filtering to input frequency signal, filter high frequency noise, capacitor C 2, capacitor C 3 also play filter action, and resistance R 2,3 two resistance of resistance R carry out the minimum that proportioning forms the high level of the speed of a motor vehicle that threshold voltage determines that single-chip microcomputer can collect or speed probe input signal.The effect of resistance R 4 provides draws voltage.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202325742U CN203190986U (en) | 2013-05-02 | 2013-05-02 | Vehicle frequency signal acquisition circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202325742U CN203190986U (en) | 2013-05-02 | 2013-05-02 | Vehicle frequency signal acquisition circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203190986U true CN203190986U (en) | 2013-09-11 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013202325742U Expired - Fee Related CN203190986U (en) | 2013-05-02 | 2013-05-02 | Vehicle frequency signal acquisition circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN203190986U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104483503A (en) * | 2014-11-19 | 2015-04-01 | 成都嵌智捷科技有限公司 | Conditioning circuit capable of outputting stable vehicle speed pulse signal |
| CN104796107A (en) * | 2015-05-06 | 2015-07-22 | 航天科技控股集团股份有限公司 | Automobile Square Wave Signal Acquisition Adaptation Method and Acquisition Adapter |
| CN107070100A (en) * | 2017-05-16 | 2017-08-18 | 锦州医科大学 | A kind of automobile dynamo governor phase signals sample circuit |
-
2013
- 2013-05-02 CN CN2013202325742U patent/CN203190986U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104483503A (en) * | 2014-11-19 | 2015-04-01 | 成都嵌智捷科技有限公司 | Conditioning circuit capable of outputting stable vehicle speed pulse signal |
| CN104796107A (en) * | 2015-05-06 | 2015-07-22 | 航天科技控股集团股份有限公司 | Automobile Square Wave Signal Acquisition Adaptation Method and Acquisition Adapter |
| CN104796107B (en) * | 2015-05-06 | 2017-10-27 | 航天科技控股集团股份有限公司 | Automobile Square Wave Signal Acquisition Adaptation Method and Acquisition Adapter |
| CN107070100A (en) * | 2017-05-16 | 2017-08-18 | 锦州医科大学 | A kind of automobile dynamo governor phase signals sample circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130911 Termination date: 20170502 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |