CN203350267U - Wheel speed signal conversion circuit - Google Patents
Wheel speed signal conversion circuit Download PDFInfo
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- CN203350267U CN203350267U CN 201320328237 CN201320328237U CN203350267U CN 203350267 U CN203350267 U CN 203350267U CN 201320328237 CN201320328237 CN 201320328237 CN 201320328237 U CN201320328237 U CN 201320328237U CN 203350267 U CN203350267 U CN 203350267U
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- resistance
- wheel speed
- speed signal
- comparer
- amplifier
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 9
- 239000003990 capacitor Substances 0.000 claims abstract description 16
- 238000001914 filtration Methods 0.000 claims description 4
- 230000009977 dual effect Effects 0.000 claims description 3
- 230000006872 improvement Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- 238000005070 sampling Methods 0.000 description 1
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Abstract
The utility model discloses a wheel speed signal conversion circuit. The wheel speed signal conversion circuit is characterized in that the wheel speed signal is connected to an intersection of a capacitor C2 and a resistor R6, the resistor R6 is connected with a capacitor C1 and a positive phase input terminal of an operational amplifier U1, an inverting input terminal of the operational amplifier U1 is connected with a resistor R1 and a resistor R2, and the other terminal of the resistor R2 is connected with an output terminal of the operational amplifier U1; the output terminal of the operational amplifier U1 is connected with a positive phase input terminal of a comparator U2, an inverting input terminal of the comparator U2 is connected with a resistor R3 and a resistor 4, one terminal of a resistor R5 is connected with an output terminal of the comparator, and the other terminal is connected with VCC; and a voltage converting circuit is formed. By adopting the above structure, the wheel speed signal conversion circuit is advantageous in that the hardware cost of the circuit is reduced; and performance is stable to ensure a vehicle to drive safely.
Description
Technical field
The utility model relates to the car speed signal to be processed, particularly a kind of wheel speed signal change-over circuit.
Background technology
On automobile, some wheel speed sensors output signals and the required signal of other control modules commonly used there will be unmatched problem at present, causes these control modules can't directly obtain wheel speed signal.
What existing technology adopted mostly is that signaling conversion circuit is changed wheel speed signal, and the sort signal change-over circuit is voltage conversion circuit, and voltage conversion circuit comprises constant-current circuit, filtering circuit and amplifying circuit.This circuit relative complex, implement cost higher.
For above-mentioned problem, a kind of comparatively simple change-over circuit is provided, the hardware cost that reduces circuit is the problem that prior art need to solve.
The utility model content
Technical problem to be solved in the utility model is to provide a kind of wheel speed signal change-over circuit, to reach the purpose of the hardware cost that reduces circuit.
For achieving the above object, the technical solution of the utility model is, a kind of wheel speed signal change-over circuit, it is characterized in that: described change-over circuit is the intersection that wheel speed signal is connected to capacitor C 2 and resistance R 6, resistance R 6 and capacitor C 1 are joined, resistance R 6 connects the normal phase input end of amplifier U1, the reverse input end connecting resistance R1 of amplifier U1 and resistance R 2, the output terminal of another termination amplifier U1 of resistance R 2; The normal phase input end of the output termination comparer U2 of amplifier U1, the reverse input end connecting resistance R3 of comparer U2 and resistance R 4, an end of resistance R 5 connects the output terminal of comparer, and the other end is connected with VCC, thereby forms voltage conversion circuit.
Described amplifier U1 is dual power supply, meets respectively VCC and VDD.
Described resistance R 6 connects capacitor C 1 and forms a low-pass filter circuit, plays the filtering low-frequency noise.
The positive terminal level of described comparer U2 during higher than the end of oppisite phase level, is output as high level; , be output as low level, thereby obtain a square-wave signal during lower than the end of oppisite phase level when the normal phase input end level of comparer.
The output type of described comparer U2 is for opening leakage type.
A kind of wheel speed signal change-over circuit, owing to adopting above-mentioned structure, the utility model has the advantage of: the hardware cost that 1, reduces circuit; 2, stable performance, guarantee the safety traffic of vehicle.
The accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail;
The structural representation that Fig. 1 is a kind of wheel speed signal change-over circuit of the utility model;
Embodiment
As shown in Figure 1, the utility model comprises amplifier U1, comparer U2, capacitor C 1, C2 and resistance R 1, R2, R3, R4, R5.
Concrete, capacitor C 2 is connected with resistance R 6, and wheel speed signal is connected on the intersection of capacitor C 2 and resistance R 6, the shunt capacitance that capacitor C 2 is wheel speed signal.Resistance R 6 and capacitor C 1 are joined, and the other end ground connection of capacitor C 1 forms low-pass filter circuit, and resistance R 6 connects the normal phase input end of amplifier U1, and amplifier U1 is dual power supply, meets respectively VCC and VDD.The reverse input end connecting resistance R1 of amplifier U1 and resistance R 2, the other end ground connection of resistance R 1, the output terminal of another termination amplifier of resistance R 2.The normal phase input end of the output termination comparer U2 of amplifier U1, the reverse input end connecting resistance R3 of comparer U2 and resistance R 4, another termination VCC of resistance R 3, the other end ground connection of resistance R 4, one end of resistance R 5 connects the output terminal of comparer U2, and the other end is connected with VCC.
The signal of wheel speed sensors output is a sinusoidal signal, when guaranteeing that this signal amplitude is low, still can accurately judge the wheel speed size, adopt to amplify and process, by the normal phase input end of its access amplifier, capacitor C 2 is shunt capacitance, is placed on the porch of circuit, resistance R 6 and capacitor C 1 form a low-pass filter circuit, play the filtering low-frequency noise.By regulating the gain of amplifier, the sinusoidal signal of input can be amplified to a desirable amplitude, be convenient to be undertaken by comparer the collection of signal, can regulate concrete yield value by resistance R 1 and resistance R 2, gain as 1+R2/R1.The output signal obtained by amplifier connects the positive terminal of comparer U2, by the resistance of regulating resistance R3 and resistance R 4, regulates the incoming level of the end of oppisite phase of amplifier U1, when the positive terminal level of comparer U2, during higher than the end of oppisite phase level, is output as high level; When the normal phase input end level of comparer U2 during lower than the end of oppisite phase level, be output as low level, thereby obtain a square-wave signal, the effect of comparer U2 is equal to sampling, situation of change during higher than a certain value on the sine wave signal waveform is converted to a fixing high level, and while being worth lower than this, be converted into a fixing low level.
The dutycycle of this square-wave signal is relevant with the level of backward end, and frequency is consistent with the wheel speed sensors output signal frequency.Thereby can judge by the frequency that judges this square-wave signal the size of wheel speed.Resistance R 5 is a pull-up resistor, because comparer U2 output type is for opening leakage type.
By this change-over circuit, be convenient to control module identification wheel speed signal, and circuit is simple, hardware cost is lower, and comparer U2 has also played buffer action, has improved the reliability of circuit.
The above is exemplarily described the utility model by reference to the accompanying drawings; obviously the utility model specific implementation is not subject to the restrictions described above; as long as the various improvement that adopted technical solutions of the utility model to carry out; or directly apply to other occasion without improvement, all within protection domain of the present utility model.
Claims (5)
1. a wheel speed signal change-over circuit, it is characterized in that: described change-over circuit is the intersection that wheel speed signal is connected to capacitor C 2 and resistance R 6, resistance R 6 and capacitor C 1 are joined, resistance R 6 connects the normal phase input end of amplifier U1, the reverse input end connecting resistance R1 of amplifier U1 and resistance R 2, the output terminal of another termination amplifier U1 of resistance R 2; The normal phase input end of the output termination comparer U2 of amplifier U1, the reverse input end connecting resistance R3 of comparer U2 and resistance R 4, an end of resistance R 5 connects the output terminal of comparer, and the other end is connected with VCC, thereby forms voltage conversion circuit.
2. a kind of wheel speed signal change-over circuit according to claim 1, it is characterized in that: described amplifier U1 is dual power supply, meets respectively VCC and VDD.
3. a kind of wheel speed signal change-over circuit according to claim 1 is characterized in that: described resistance R 6 connects capacitor C 1 and forms low-pass filter circuits, plays the filtering low-frequency noise.
4. a kind of wheel speed signal change-over circuit according to claim 1 is characterized in that: the positive terminal level of described comparer U2 during higher than the end of oppisite phase level, is output as high level; , be output as low level, thereby obtain a square-wave signal during lower than the end of oppisite phase level when the normal phase input end level of comparer.
5. according to the described a kind of wheel speed signal change-over circuit of claim 1 or 4, it is characterized in that: the output type of described comparer U2 is for opening leakage type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320328237 CN203350267U (en) | 2013-06-07 | 2013-06-07 | Wheel speed signal conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320328237 CN203350267U (en) | 2013-06-07 | 2013-06-07 | Wheel speed signal conversion circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203350267U true CN203350267U (en) | 2013-12-18 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320328237 Expired - Lifetime CN203350267U (en) | 2013-06-07 | 2013-06-07 | Wheel speed signal conversion circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203350267U (en) |
Cited By (1)
| 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 |
-
2013
- 2013-06-07 CN CN 201320328237 patent/CN203350267U/en not_active Expired - Lifetime
Cited By (1)
| 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 |
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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 | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131218 |