CN203443967U - Automobile instrument speed acquisition system - Google Patents
Automobile instrument speed acquisition system Download PDFInfo
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- CN203443967U CN203443967U CN201320573673.7U CN201320573673U CN203443967U CN 203443967 U CN203443967 U CN 203443967U CN 201320573673 U CN201320573673 U CN 201320573673U CN 203443967 U CN203443967 U CN 203443967U
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Abstract
The utility model discloses an automobile instrument speed acquisition system. A high-electrical level speed signal stabilized voltage output circuit receives outside high-electrical level speed sensor signals, and outputs stable high-electric level signals which accord with single chip microcomputer speed detection conditions; a low-electrical level speed signal stabilized voltage output circuit receives outside low-electric level speed sensor signals and outputs stable low-electric level signals which accord with the single chip microcomputer speed detection conditions; an over-voltage protection circuit performs overvoltage protection on the automobile instrument speed acquisition system; and a signal filtering circuit filters high-frequency signals and noise signals in the speed sensor signals which are inputted from the outside. With principles of triode switch characteristics adopted, the automobile instrument speed acquisition system of the utility model can avoid influence of outside signals on signal acquisition, and has signal filtering and circuit protection functions, and can be applicable to all kinds of sensor voltage. The automobile instrument speed acquisition system is advantageous in accurate and stable signal acquisition, avoidance of inaccurate speed measurement or incapability of speed measurement, simple structure, strong practicability as well as high generalization and application value.
Description
Technical field
The utility model belongs to automobile circuit technical field, relates in particular to a kind of automobile instrument speed acquisition system.
Background technology
Automobile instrument needs the speed of display automobile at present, substantially in motor pointer mode, realizes, and conventional circuit is all to arrive speed square-wave signal by dividing potential drop, certain filtering, then by catching of single-chip microcomputer, is calculated and is obtained velocity information.
Existing speed acquisition circuit as shown in Figure 1, speed pickup sends rate signal, instrument port processing, sensor adopts Hall element at present mostly, the signal sending is all generally square-wave signal, by C8 (0.01uF/50v) filtering, the cut-off of Z2 diode reverse, signal is by the dividing potential drop filtering of R8 and R12, entered again a C9 filtering, give mcu rate signal, mcu adopts the mc9s12hy48 single-chip microcomputer of freescale, mc9s12hy48 to high level collection signal General Requirements 4V or more than.
When extraneous sensor signal is high level (12V), the reverse cut-off of Z2 diode, P_IGN is 12V, P_IGN passes through R5, R8, the dividing potential drop of R12, the voltage that mcu speed acquisition mouth gathers is probably 12*47K (10K+68K+47K)=4.5V (ignore single-chip microcomputer here and gather port internal resistance), what single-chip microcomputer now collected is high level.
When sensor signal is low level (0V), Z2 diode pipe pressure reduction is 0.7V, and Z2 diode anode is clamped to voltage 0.7V, and 0.7V voltage is by R8, R12 dividing potential drop, entering mcu speed port is low level, and Mcu calculates speed according to the high-low level time collecting.
Existing speed acquisition circuit is to obtain by dividing potential drop the voltage that single-chip microcomputer can receive, this just requires extraneous rate signal can not have fluctuation, high, it is just high that single-chip microcomputer dividing potential drop obtains, single-chip microcomputer holds be can't stand, extraneous rate signal voltage is low, single-chip microcomputer does not collect again, the signal that real sensor is come is unsettled, larger for some car voltage fluctuation especially, when load variations, line voltage can become, also have on automobile and have various interference, capital makes the swinging of signal gathering, and then it is next or inaccurate to cause automobile instrument speed acquisition system speed not measure.
Utility model content
The purpose of this utility model is to provide a kind of automobile instrument speed acquisition system, being intended to solve existing speed acquisition circuit is to obtain by dividing potential drop the voltage signal that single-chip microcomputer can receive, the extraneous rate signal gathering is had relatively high expectations, when the extraneous rate signal gathering is unstable, will cause automobile instrument speed acquisition system speed not measure or inaccurate problem.
The utility model is achieved in that a kind of automobile instrument speed acquisition system, and this automobile instrument speed acquisition system comprises:
For receiving the speed sensor signal of extraneous high level, output meets the high level rate signal voltage-stabilizing output circuit of the stable high level signal of single-chip microcomputer speed testing conditions;
Be used for receiving extraneous low level speed sensor signal, output meets the low level rate signal voltage-stabilizing output circuit of the stable low level signal of single-chip microcomputer speed testing conditions;
Be used for, when the extraneous speed sensor signal overvoltage of inputting, automobile instrument speed acquisition system being carried out to the overvoltage crowbar of overvoltage protection;
For the speed sensor signal medium-high frequency signal of the extraneous input of filtering and the signal filtering circuit of noise signal.
Further; described high level rate signal voltage-stabilizing output circuit and low level rate signal voltage-stabilizing output circuit are realized the output of voltage regulation signal by the switching characteristic principle of triode Q1 and triode Q2; described overvoltage crowbar is realized overvoltage protection by schottky diode DS1 and schottky diode DS2, and described signal filtering circuit suppresses high frequency, filtering noise by capacitor C s1 and capacitor C s2.
Further, the physical circuit of this automobile instrument speed acquisition system is connected to: one end of resistance R S1 is speed sensor signal input end, the other end of resistance R S1 is connected with the base stage B of triode Q1, the collector C of triode Q1 is connected with resistance R S2, the emitter E of triode Q1 is by resistance R S3 ground connection, the emitter E of triode Q1 is also connected with one end of resistance R S4, the other end of described resistance R S4 is connected with one end of capacitor C s3, the other end of described capacitor C s3 is connected with the base stage B of triode Q2 and one end of resistance R S5, the other end ground connection of described resistance R S5, the base stage B of triode Q2 is also connected with VCC by resistance R S7, VCC is connected with the collector C of triode Q2 by resistance R S6, the direct ground connection of emitter E of triode Q2, the collector C of triode Q2 is also speed detection signal output terminal,
In described overvoltage crowbar, the negative electrode of schottky diode DS1 is connected with the base stage B of described triode Q1, the direct ground connection of anode of schottky diode DS1, in described overvoltage crowbar, the negative electrode of schottky diode DS2 is connected with the base stage B of described triode Q2, the direct ground connection of anode of schottky diode DS2;
Capacitor C s1 in described signal filtering circuit is connected in parallel on the two ends of resistance R S3, and capacitor C s2 is connected in parallel on the two ends of resistance R S5.
Further, when extraneous speed sensor signal is high level, triode Q1 and triode Q2 saturation conduction, this automobile instrument speed acquisition system output meets the stable high level signal of single-chip microcomputer speed testing conditions;
When extraneous speed sensor signal is low level, triode Q1 and triode Q2 cut-off, this automobile instrument speed acquisition system output meets the stable low level signal of single-chip microcomputer speed testing conditions.
Further, the resistance of resistance R S1 is 15K, the resistance of resistance R S2 is 20K, and the resistance of resistance R S3 is 10K, and the resistance of resistance R S4 is 1K, the resistance of resistance R S5 is 20K, the resistance of resistance R S6 is 4.7K, and the resistance of resistance R S7 is 30K, and the model of schottky diode DS1 and schottky diode DS2 is IN5822, the resistance of capacitor C s1, capacitor C s2 and capacitor C s3 is 0.01uF, and the magnitude of voltage of VCC is 5V.
The automobile instrument speed acquisition system that the utility model provides, high level rate signal voltage-stabilizing output circuit receives the speed sensor signal of extraneous high level, output meets the stable high level signal of single-chip microcomputer speed testing conditions, low level rate signal voltage-stabilizing output circuit receives extraneous low level speed sensor signal, output meets the stable low level signal of single-chip microcomputer speed testing conditions, overvoltage crowbar carries out overvoltage protection to automobile instrument speed acquisition system, effectively prevented circuit devcie because of overvoltage impaired, speed sensor signal medium-high frequency signal and the noise signal of the extraneous input of signal filtering circuit filtering, when extraneous speed sensor signal is high level, triode Q1 and triode Q2 saturation conduction, this automobile instrument speed acquisition system output meets the stable high level signal of single-chip microcomputer speed testing conditions, when extraneous speed sensor signal is low level, triode Q1 and triode Q2 cut-off, this automobile instrument speed acquisition system output meets the stable low level signal of single-chip microcomputer speed testing conditions, the utility model adopts triode switch characteristic principle, avoided the impact of outer signals on collection signal, the high voltage signal that can not directly be gathered by single-chip microcomputer is converted into receivable collection signal, there is the effect of signal filtration, circuit protection simultaneously, can adapt to various sensor voltage, collection signal accurate stable, there will not be the inaccurate phenomenon that maybe cannot test the speed that tests the speed, simple in structure
Practical, there is stronger propagation and employment and be worth.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the speed acquisition circuit that provides of prior art;
The circuit theory diagrams of the automobile instrument speed acquisition system that Fig. 2 provides for the utility model embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
Below in conjunction with drawings and the specific embodiments, application principle of the present utility model is further described.
The circuit theory diagrams of the automobile instrument speed acquisition system that Fig. 2 provides for the utility model embodiment.For convenience of explanation, only show the part relevant to the utility model embodiment.
When extraneous sensor signal is high level (general 12V), the resistance R s3 of 10k guarantees triode Q1 saturation conduction, guarantees also conducting of triode Q2 simultaneously, and the resistance R s6 of 4.7k has guaranteed triode Q2 saturation conduction, VCC voltage is 5V, and giving single-chip microcomputer signal voltage is stable high level; P_IGN is that car key is opened, to the 12V electricity of instrument confession.
When extraneous rate signal is low level, triode Q1 cut-off, triode Q2 also ends, and single-chip microcomputer speed port signal is low level.
The utility model is according to the conducting cut-off of triode Q1 and triode Q2, the square-wave signal of 12v is converted into the receivable square-wave signal of single-chip microcomputer, as long as guarantee the 0.7V base voltage of triode Q1 and triode Q2, there are a plurality of kilohms of resistance centre, high low voltage signal is all adapted to, so the utility model is the circuit of a wide range input voltage.
Schottky diode DS1 and schottky diode DS2 shield to circuit, model is that IN5822 schottky diode DS1 and schottky diode DS2 have the advantages that to force down than general diode reverse electric conduction, when extraneous rate signal overvoltage, schottky diode DS1 and schottky diode DS2 can fast conductings, device is below played a protective role, can recover fast simultaneously, generally need only several nanoseconds, schottky diode DS1 and schottky diode DS2 disturb and play a very good protection the surge voltage as on automobile;
Capacitor C s1, capacitor C s2 and capacitor C s3 have inhibition high frequency, the effect of filtering noise simultaneously.
The automobile instrument speed acquisition system that the utility model embodiment provides, high level rate signal voltage-stabilizing output circuit receives the speed sensor signal of extraneous high level, output meets the stable high level signal of single-chip microcomputer speed testing conditions, low level rate signal voltage-stabilizing output circuit receives extraneous low level speed sensor signal, output meets the stable low level signal of single-chip microcomputer speed testing conditions, overvoltage crowbar carries out overvoltage protection to automobile instrument speed acquisition system, effectively prevented circuit devcie because of overvoltage impaired, speed sensor signal medium-high frequency signal and the noise signal of the extraneous input of signal filtering circuit filtering, when extraneous speed sensor signal is high level, triode Q1 and triode Q2 saturation conduction, this automobile instrument speed acquisition system output meets the stable high level signal of single-chip microcomputer speed testing conditions, when extraneous speed sensor signal is low level, triode Q1 and triode Q2 cut-off, this automobile instrument speed acquisition system output meets the stable low level signal of single-chip microcomputer speed testing conditions, the utility model adopts triode switch characteristic principle, avoided the impact of outer signals on collection signal, the high voltage signal that can not directly be gathered by single-chip microcomputer is converted into receivable collection signal, there is the effect of signal filtration, circuit protection simultaneously, can adapt to various sensor voltage, collection signal accurate stable, there will not be the inaccurate phenomenon that maybe cannot test the speed that tests the speed, simple in structure, practical, there is stronger propagation and employment and be worth.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection domain of the present utility model.
Claims (3)
1. an automobile instrument speed acquisition system, is characterized in that, this automobile instrument speed acquisition system comprises:
For receiving the speed sensor signal of extraneous high level, output meets the high level rate signal voltage-stabilizing output circuit of the stable high level signal of single-chip microcomputer speed testing conditions;
Be used for receiving extraneous low level speed sensor signal, output meets the low level rate signal voltage-stabilizing output circuit of the stable low level signal of single-chip microcomputer speed testing conditions;
Be used for, when the extraneous speed sensor signal overvoltage of inputting, automobile instrument speed acquisition system being carried out to the overvoltage crowbar of overvoltage protection;
For the speed sensor signal medium-high frequency signal of the extraneous input of filtering and the signal filtering circuit of noise signal.
2. automobile instrument speed acquisition system as claimed in claim 1, is characterized in that, described high level rate signal voltage-stabilizing output circuit and low level rate signal voltage-stabilizing output circuit mainly consist of triode Q1 and triode Q2; Described overvoltage crowbar mainly consists of schottky diode DS1 and schottky diode DS2, and described signal filtering circuit mainly consists of capacitor C s1, capacitor C s2, capacitor C s3.
3. automobile instrument speed acquisition system as claimed in claim 2, it is characterized in that, the physical circuit of this automobile instrument speed acquisition system is connected to: one end of resistance R S1 is speed sensor signal input end, the other end of resistance R S1 is connected with the base stage B of triode Q1, the collector C of triode Q1 is connected with resistance R S2, the emitter E of triode Q1 is by resistance R S3 ground connection, the emitter E of triode Q1 is also connected with one end of resistance R S4, the other end of described resistance R S4 is connected with one end of capacitor C s3, the other end of described capacitor C s3 is connected with the base stage B of triode Q2 and one end of resistance R S5, the other end ground connection of described resistance R S5, the base stage B of triode Q2 is also connected with VCC by resistance R S7, VCC is connected with the collector C of triode Q2 by resistance R S6, the direct ground connection of emitter E of triode Q2, the collector C of triode Q2 is also speed detection signal output terminal,
In described overvoltage crowbar, the negative electrode of schottky diode DS1 is connected with the base stage B of described triode Q1, the direct ground connection of anode of schottky diode DS1, in described overvoltage crowbar, the negative electrode of schottky diode DS2 is connected with the base stage B of described triode Q2, the direct ground connection of anode of schottky diode DS2;
Capacitor C s1 in described signal filtering circuit is connected in parallel on the two ends of resistance R S3, and capacitor C s2 is connected in parallel on the two ends of resistance R S5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320573673.7U CN203443967U (en) | 2013-09-17 | 2013-09-17 | Automobile instrument speed acquisition system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320573673.7U CN203443967U (en) | 2013-09-17 | 2013-09-17 | Automobile instrument speed acquisition system |
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| Publication Number | Publication Date |
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| CN203443967U true CN203443967U (en) | 2014-02-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320573673.7U Expired - Lifetime CN203443967U (en) | 2013-09-17 | 2013-09-17 | Automobile instrument speed acquisition system |
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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 |
| CN109975582A (en) * | 2019-02-28 | 2019-07-05 | 西安法士特汽车传动有限公司 | A kind of PWM wave output detection circuit of automobile |
| CN110045651A (en) * | 2019-04-23 | 2019-07-23 | 苏州爱科赛博电源技术有限责任公司 | Electric automobile controller digital input circuit with adjustable threshold value and compatible positive and negative control |
-
2013
- 2013-09-17 CN CN201320573673.7U patent/CN203443967U/en not_active Expired - Lifetime
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 |
| CN109975582A (en) * | 2019-02-28 | 2019-07-05 | 西安法士特汽车传动有限公司 | A kind of PWM wave output detection circuit of automobile |
| CN110045651A (en) * | 2019-04-23 | 2019-07-23 | 苏州爱科赛博电源技术有限责任公司 | Electric automobile controller digital input circuit with adjustable threshold value and compatible positive and negative control |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140219 |
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| CX01 | Expiry of patent term |