CN205506856U - Speed sensor processing circuit - Google Patents
Speed sensor processing circuit Download PDFInfo
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- CN205506856U CN205506856U CN201620261734.XU CN201620261734U CN205506856U CN 205506856 U CN205506856 U CN 205506856U CN 201620261734 U CN201620261734 U CN 201620261734U CN 205506856 U CN205506856 U CN 205506856U
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Abstract
The utility model discloses a speed sensor processing circuit, including comparator, normal phase inlet circuit, opposition inlet circuit, output circuit and microprocessor, normal phase inlet circuit connects in the non -inverting input end of comparator, and opposition inlet circuit connects in the inverting input end of comparator, and output circuit connection is connected with microprocessor behind the output of comparator. The utility model discloses a speed sensor processing circuit has realized the function to plastic, filtering and the collection of hall formula speed of a motor vehicle signal, is the distinguishable TTL level signal of MPU microprocessor with speed of a motor vehicle signal conversion, the filtering unnecessary interfering signal to measure the speed of a motor vehicle accurately. This circuit has that the interference killing feature is strong, compatible good, circuit structure is simple, stable performance, advantage that the practicality is strong, but the wide application is in to hall formula acquisition of sensor signal module.
Description
Technical field
This utility model relates to a kind of vehicle speed sensor signal processing circuit, belongs to pulse signal processing technology field.
Background technology
Measurement currently for speed mainly has a sensor of three types: photo-electric, magneto-electric, Hall-type.Wherein electro-optical pickoff is easily made it lose efficacy by the external interference such as dust, vibration；Magnetoelectric sensor is spontaneous electrically due to it, and low-speed performance difference is not suitable for vehicle speed measurement；Low-speed performance that vehicle speed sensor more options are good and the hall sensor of interference free performance.
The GES obtained by hall sensor, belongs to irregular undesirable square-wave signal.It must be carried out signal processing just can make microprocessor be identified.A good GES processes circuit, should be provided simultaneously with height amplitude signal is converted to TTL signal accurately, the function that late-class circuit is not burned out is ensured time higher with signal amplitude, and, require higher capacity of resisting disturbance and good compatibility, the area requirement that tests the speed when running with the vehicle speed sensor and vehicle adapting to different vendor.
Utility model content
This utility model is in order to overcome the deficiency of above technology, it is provided that a kind of anti-interference is good, the vehicle speed sensor signal processing circuit of the wide ranges that tests the speed.
This utility model overcomes its technical problem be the technical scheme is that
A kind of vehicle speed sensor signal processing circuit, including comparator, normal phase input end circuit, anti-phase input terminal circuit, circuit of output terminal and microprocessor；Described normal phase input end circuit includes resistance R04, resistance R06 and resistance R07, one termination power of R04, the other end of R04 is connected with the normal phase input end of one end of R06, one end of R07 and comparator, and the other end of R06 is connected with the outfan of comparator, the other end ground connection of R07；Described anti-phase input terminal circuit includes resistance R01, resistance R02, resistance R03, diode D01, diode D02, electric capacity C01 and electric capacity C02, the negative pole of D01 is vehicle speed sensor signal input part, the positive pole of D01 is connected with one end of R01 and R02, another termination power of R01, the other end of R02 is connected with one end of the negative pole of D02, one end of R03 and C01, the other end of R03 is connected with one end of the inverting input of comparator and C02, the other end of C02 is connected with the normal phase input end of comparator, the positive pole of D02 and the other end ground connection of C01；Described circuit of output terminal, is connected with microprocessor after connecting pull-up resistor R05 by the outfan of comparator.
Preferred according to this utility model, the high voltage comparative threshold voltage of comparator and low-voltage comparative threshold voltage difference are more than 1V and less than 2V.
Preferred according to this utility model, diode D01 is Schottky diode 1N5819, and its forward voltage drop is about 0.6V；Comparator is hysteresis loop comparator MAX9031, can be adjusted the comparison voltage of comparator by the resistance of regulation resistance R04, resistance R06 and resistance R07；Microprocessor is 32 single-chip microcomputer MPC5644A of Freescale company, includes time processing unit ETPU inside it, can accurately calculate speed.
The beneficial effects of the utility model are:
Vehicle speed sensor signal processing circuit of the present utility model achieves the shaping to Hall-type GES, the function filtering and gathering, GES is converted to MPU microprocessor discernible Transistor-Transistor Logic level signal, filter unnecessary interference signal, thus measure speed accurately.This circuit have capacity of resisting disturbance strong, compatible good, circuit structure simple, stable performance, practical advantage, can be widely applied in hall sensor signal acquisition module.
Accompanying drawing explanation
Fig. 1 is circuit theory schematic diagram of the present utility model.
Detailed description of the invention
Being better understood from this utility model for the ease of those skilled in the art, be described in further details this utility model with specific embodiment below in conjunction with the accompanying drawings, following is only exemplary not limit protection domain of the present utility model.
As it is shown in figure 1, vehicle speed sensor signal processing circuit of the present utility model, including comparator, normal phase input end circuit, anti-phase input terminal circuit, circuit of output terminal and microprocessor.Described normal phase input end circuit includes resistance R04, resistance R06 and resistance R07, one termination power of R04, the other end of R04 is connected with the normal phase input end of one end of R06, one end of R07 and comparator, and the other end of R06 is connected with the outfan of comparator, the other end ground connection of R07；Described anti-phase input terminal circuit includes resistance R01, resistance R02, resistance R03, diode D01, diode D02, electric capacity C01 and electric capacity C02, the negative pole of D01 is vehicle speed sensor signal input part, the positive pole of D01 is connected with one end of R01 and R02, another termination power of R01, the other end of R02 is connected with one end of the negative pole of D02, one end of R03 and C01, the other end of R03 is connected with one end of the inverting input of comparator and C02, the other end of C02 is connected with the normal phase input end of comparator, the positive pole of D02 and the other end ground connection of C01；Described circuit of output terminal, is connected with microprocessor after connecting pull-up resistor R05 by the outfan of comparator.
After vehicle speed sensor signal is input to signal processing circuit of the present utility model, if the voltage magnitude of GES deducts the forward voltage drop value of diode D01 higher than 5V, diode D01 ends, now the positive pole of Vi(diode D01 and the intersection of R01 and R02 are set to Vi) voltage at place is pulled upward to 5V by pull-up resistor R01, after interference signal removed by the RC filter circuit of resistance R02 and electric capacity C01 composition and the RC filter circuit of resistance R03 and electric capacity C02 composition, it is input to the inverting input of comparator；If the voltage magnitude of GES deducts the forward voltage drop value of diode D01 less than 5V, diode D01 turns on, and now the voltage at Vi is the forward voltage drop value that the voltage magnitude of GES deducts diode D01.In the range of the input signal of speed high low amplitude value can be clamped at certain voltage after diode D01 and filter circuit by this circuit, it is then input to the inverting input of comparator, the hysteresis comparison circuit formed by resistance R04, resistance R06 and resistance R07 and comparator, being that Transistor-Transistor Logic level signal is input to microprocessor MPC5644A by GES rotating speed, microprocessor carries out calculation process thus accurately calculates speed.
The RC filter circuit of described resistance R02 and electric capacity C01 composition and the RC filter circuit of resistance R03 and electric capacity C02 composition need to select suitable capacitance-resistance value, thus obtain suitable time constant filter, ensureing that GES is neither lost and can effectively filter signal burr, the detection making microprocessor is the most accurate；The hysteresis of hysteresis loop comparator is compared voltage threshold and can be adjusted by resistance R04, resistance R06 and resistance R07, in general, two saltus step threshold difference (i.e. high voltage comparative threshold voltage and low-voltage comparative threshold voltage difference) of hysteresis loop comparator are more than 1V and less than 2V, the resistance choosing R04 in the present embodiment is 1 kilo-ohm, R06 is 7.5 kilo-ohms, R07 is 2 kilo-ohms, calculating high voltage comparative threshold voltage is 3.2V, low-voltage comparative threshold voltage is 1.8V, so that circuit has higher capacity of resisting disturbance.
Above only describes ultimate principle of the present utility model and preferred implementation, those skilled in the art can many changes may be made and improves according to foregoing description, and these changes and improvements should belong to protection domain of the present utility model.
Claims (3)
1. a vehicle speed sensor signal processing circuit, it is characterised in that:
Including comparator, normal phase input end circuit, anti-phase input terminal circuit, circuit of output terminal and microprocessor；
Described normal phase input end circuit includes resistance R04, resistance R06 and resistance R07, one termination power of resistance R04, the other end of resistance R04 is connected with the normal phase input end of one end, one end of resistance R07 and the comparator of resistance R06, the other end of resistance R06 is connected with the outfan of comparator, the other end ground connection of resistance R07；
Described anti-phase input terminal circuit includes resistance R01, resistance R02, resistance R03, diode D01, diode D02, electric capacity C01 and electric capacity C02, the negative pole of diode D01 is vehicle speed sensor signal input part, the positive pole of diode D01 is connected with one end of resistance R01 and resistance R02, another termination power of resistance R01, the other end of resistance R02 and the negative pole of diode D02, one end of resistance R03 is connected with one end of electric capacity C01, the other end of resistance R03 is connected with one end of the inverting input of comparator and electric capacity C02, the other end of electric capacity C02 is connected with the normal phase input end of comparator, the positive pole of diode D02 and the other end ground connection of electric capacity C01；
Described circuit of output terminal, is connected with microprocessor after connecting pull-up resistor R05 by the outfan of comparator.
Vehicle speed sensor signal processing circuit the most according to claim 1, it is characterised in that: the high voltage comparative threshold voltage of comparator and low-voltage comparative threshold voltage difference are more than 1V and less than 2V.
Vehicle speed sensor signal processing circuit the most according to claim 1, it is characterised in that: diode D01 is Schottky diode 1N5819；Comparator is hysteresis loop comparator MAX9031；Microprocessor is single-chip microcomputer MPC5644A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620261734.XU CN205506856U (en) | 2016-03-31 | 2016-03-31 | Speed sensor processing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620261734.XU CN205506856U (en) | 2016-03-31 | 2016-03-31 | Speed sensor processing circuit |
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| CN205506856U true CN205506856U (en) | 2016-08-24 |
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| CN201620261734.XU Active CN205506856U (en) | 2016-03-31 | 2016-03-31 | Speed sensor processing circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105675904A (en) * | 2016-03-31 | 2016-06-15 | 中国重汽集团济南动力有限公司 | Vehicle speed sensor signal processing circuit |
| CN106592073A (en) * | 2017-01-10 | 2017-04-26 | 约科布·缪勒机械制造(中国)有限公司 | Speed measuring device for ribbon loom |
| CN109738015A (en) * | 2019-01-11 | 2019-05-10 | 清华大学 | Signal processing apparatus |
-
2016
- 2016-03-31 CN CN201620261734.XU patent/CN205506856U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105675904A (en) * | 2016-03-31 | 2016-06-15 | 中国重汽集团济南动力有限公司 | Vehicle speed sensor signal processing circuit |
| CN106592073A (en) * | 2017-01-10 | 2017-04-26 | 约科布·缪勒机械制造(中国)有限公司 | Speed measuring device for ribbon loom |
| CN109738015A (en) * | 2019-01-11 | 2019-05-10 | 清华大学 | Signal processing apparatus |
| CN109738015B (en) * | 2019-01-11 | 2019-11-22 | 清华大学 | Signal processing apparatus |
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