CN209264746U - A kind of vehicle wheel speed signal condition detection circuit - Google Patents
A kind of vehicle wheel speed signal condition detection circuit Download PDFInfo
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- CN209264746U CN209264746U CN201821755694.XU CN201821755694U CN209264746U CN 209264746 U CN209264746 U CN 209264746U CN 201821755694 U CN201821755694 U CN 201821755694U CN 209264746 U CN209264746 U CN 209264746U
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- wheel speed
- hysteresis comparator
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- vehicle wheel
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Abstract
The utility model relates to a kind of vehicle wheel speed signal condition detection circuits, the sample circuit of voltage signal is converted to including the current signal for detecting wheel speed sensors, including hysteresis comparator and bleeder circuit, the bleeder circuit includes divider resistance, one end stable connection voltage of the bleeder circuit, the other end connects the output end of the hysteresis comparator, the dividing point of bleeder circuit connects the non-inverting input terminal of the hysteresis comparator, and the inverting input terminal of hysteresis comparator connects the sample circuit.The circuit, which is realized, is converted to voltage square wave signal for the current signal that wheel speed sensors detect, and can be detected by single-chip microcontroller or other control equipment convenient for signal, to calculate vehicle wheel speed.The circuit has strong anti-interference ability, and when the current signal of wheel speed sensors detection is interfered, does not influence the output of rear class square-wave signal, so that stable output signal, reliability is higher.
Description
Technical field
The utility model belongs to technical field of automotive electronics, and in particular to a kind of vehicle wheel speed signal condition detection circuit.
Background technique
With the development of the automobile industry, society made higher requirement the quantity and quality of automobile.In order to improve
The comfortableness and security of car steering, many automobiles both increase electronic control unit.Such as controlling vehicle operation shape
The entire car controller of condition, for control gearbox-gear automatic switchover automatic gear-box controller and for control start
The engine controller etc. of machine.In order to preferably control the operation of automobile, electronic control unit must monitor the fortune of automobile the moment
Row situation.Wherein, vehicle wheel speed signal is the important parameter of vehicle running state.In the process of moving, body modules need vehicle
The wheel speed of wheel is calculated in real time, to control body gesture, for example, in the control of ABS, the control of ESC, ASR etc.
Control all needs the wheel speed information of wheel.
In vehicle travel process, the wheel speed information of wheel, wheel speed sensing are generally acquired by setting wheel speed sensors
Device is passive sensor, and wheel speed sensors export sine wave signal.Wheel speed signal is judged for the ease of controller, this
When need sine wave signal being converted to square-wave signal.
Authorization Notice No. is that the Chinese utility model patent of CN207067165U discloses a kind of tach signal sampling processing
The current signal that wheel speed sensors detect can be converted into voltage signal, sample and use for single-chip microcontroller, but should by circuit, the circuit
Circuit anti-interference ability is poor, and the square wave that will cause rear class output when wheel speed sensors signal interferes is shaken therewith, gives
Actual measurement brings certain error.
Utility model content
The purpose of this utility model is to provide a kind of vehicle wheel speed signal condition detection circuits, to solve the prior art
In tach signal conditioning detection circuit poor anti jamming capability the problem of.
In order to solve the above technical problems, the technical solution of the utility model are as follows:
The utility model provides a kind of vehicle wheel speed signal condition detection circuit, including for detecting wheel speed sensors
Current signal be converted to the sample circuit of voltage signal, further include hysteresis comparator and bleeder circuit, the bleeder circuit packet
Divider resistance, one end stable connection voltage of the bleeder circuit are included, the other end connects the output end of the hysteresis comparator, point
The dividing point of volt circuit connects the non-inverting input terminal of the hysteresis comparator, adopts described in the inverting input terminal connection of hysteresis comparator
Sample circuit.
The vehicle wheel speed signal condition detection circuit of the utility model realizes that the current signal for detecting wheel speed sensors turns
It is changed to voltage square wave signal, can be detected by single-chip microcontroller or other control equipment convenient for signal, to calculate vehicle wheel
Speed.The circuit has strong anti-interference ability, and when the current signal of wheel speed sensors detection is interfered, does not influence rear class
The output of square-wave signal, so that stable output signal, reliability is higher.
Further, burning voltage in order to obtain, the burning voltage include the first power supply, between the first power supply and ground according to
Secondary string is equipped with first resistor and zener diode, and one of the concatenation point connection bleeder circuit between first resistor and zener diode
End；The minus earth of the zener diode.
Further, in order to protect hysteresis comparator, the inverting input terminal of the hysteresis comparator also passes through a clamper
Diode connects second source；The cathode of the clamp diode connects second source.
Further, the sample circuit connects the inverting input terminal of the hysteresis comparator by coupling resistance.
Detailed description of the invention
Fig. 1 is the circuit diagram of the vehicle wheel speed signal condition detection circuit of the utility model.
Specific embodiment
To keep the purpose of this utility model, technical solution and advantage clearer, with reference to the accompanying drawings and embodiments, to this
Utility model is described in further detail.
Circuit embodiments
As shown in Figure 1, each device design involved in the embodiment is as follows: R3 is 20k Ω, and R4 is 100 Ω, and R5 is
10k Ω, R1 are 470 Ω, and R2 is 100k Ω.
Wheel speed sensors are passive sensor, and wheel speed sensors export the electric current of 7mA or 14mA with the rotation of wheel,
Detection for signal.The current signal that the wheel speed sensors detect is accessed into vehicle wheel speed as shown in Figure 1 by interface S1
In signal condition detection circuit, the current signal that wheel speed sensors export is converted to 0V~4.3V's by the circuit to realize
Square-wave signal.
As shown in Figure 1, the electricity that VCC is detected by sequentially connected diode D3, resistance R6, resistance R7, wheel speed sensors
Flow signal ground；Wherein, the anode of diode D3 connects VCC.The cathode of diode D3 is also connected with the collector of triode Q1, and three
The concatenation point of the base stage connection resistance R6 and resistance R7 of pole pipe Q1, the emitter of triode Q1 are grounded by resistance R8.Triode
The emitter of Q1 also passes through the inverting input terminal of coupling resistance R4 connection hysteresis comparator U1.
After the current signal access interface S1 of wheel speed sensors detection, 0V~4.3V is generated at V2 by triode Q1
Square-wave signal, voltage is calculated by the comparison of hysteresis comparator U1 at V2, to export the square-wave signal of 0V~3.5V for monolithic
Machine sampling uses.
The resistance R1 and zener diode D1 that 5V power supply is set by string are grounded, the minus earth of zener diode D1.Resistance
R1 connects the output end of hysteresis comparator U1, resistance R2, R3 with the concatenation of zener diode D1 point by resistance R2, R3 that string is set
Concatenation point connection hysteresis comparator U1 a non-inverting input terminal.
Here zener diode D1 in 3.3V, provides voltage stabilization at V1 to reference voltage for hysteresis comparator U1.
When V3=V1*R3/ (R2+R3)+V4*R2/ (R2+R3) at the output end V4 of hysteresis comparator U1 is 0V, at V3
Voltage is 0.55V, and when being 3.5V at the output end V4 of hysteresis comparator U1, voltage is 3.5V at V3.Voltage is at V2
It is 0V at the output end V4 of hysteresis comparator U1, voltage is 0.55V at V3 at this time, as long as voltage is greater than at V2 at this time when 4.3V
It keeps stablizing at the output end V4 of 0.55V, hysteresis comparator U1 constant；Voltage is 0V, the output of hysteresis comparator U1 at V2
Holding the place V4 is 3.5V, and it is 3.5V that V3, which locates voltage, as long as voltage is less than 3.5V at V2 at this time, at the output end V4 of hysteresis comparator U1
Holding is stablized constant.
Moreover, the inverting input terminal of hysteresis comparator also passes through a clamp diode D2 connection 5V power supply；Two pole of clamper
The cathode of pipe D2 connects 5V power supply.Clamp diode D2 is used as clamper, when external input signal is more than 5V, two pole of clamper
Pipe D2 is clamped to 5V by external input voltage, can play the purpose of protection hysteresis comparator U1, avoid because of external instantaneous overvoltage
Hysteresis comparator is caused to burn out.
So far, which can be converted to the current signal that wheel speed sensors export the square-wave signal of 0V~3.5V, should
Signal can be detected by single-chip microcontroller or other control equipment, to calculate vehicle wheel speed.
It is discussed in detail although the content of the utility model has passed through above preferred embodiment, but it should be appreciated that on
The description stated is not considered as limitations of the present invention.After those skilled in the art have read above content, for
A variety of modifications and substitutions of the utility model all will be apparent.Therefore, the protection scope of the utility model should be by appended
Claim limit.
Claims (4)
1. a kind of vehicle wheel speed signal condition detection circuit is converted to electricity including the current signal for detecting wheel speed sensors
Press the sample circuit of signal, which is characterized in that further include hysteresis comparator and bleeder circuit, the bleeder circuit includes partial pressure electricity
Resistance, one end stable connection voltage of the bleeder circuit, the other end connect the output end of the hysteresis comparator, bleeder circuit
Dividing point connects the non-inverting input terminal of the hysteresis comparator, and the inverting input terminal of hysteresis comparator connects the sample circuit.
2. vehicle wheel speed signal condition detection circuit according to claim 1, which is characterized in that the burning voltage includes
First power supply, successively string is equipped with first resistor and zener diode, first resistor and zener diode between the first power supply and ground
Between concatenation point connection bleeder circuit one end；The minus earth of the zener diode.
3. vehicle wheel speed signal condition detection circuit according to claim 1, which is characterized in that the hysteresis comparator
Inverting input terminal also passes through a clamp diode connection second source；The cathode of the clamp diode connects second source.
4. vehicle wheel speed signal condition detection circuit according to claim 1, which is characterized in that the sample circuit passes through
Coupling resistance connects the inverting input terminal of the hysteresis comparator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821755694.XU CN209264746U (en) | 2018-10-25 | 2018-10-25 | A kind of vehicle wheel speed signal condition detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821755694.XU CN209264746U (en) | 2018-10-25 | 2018-10-25 | A kind of vehicle wheel speed signal condition detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209264746U true CN209264746U (en) | 2019-08-16 |
Family
ID=67559016
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821755694.XU Active CN209264746U (en) | 2018-10-25 | 2018-10-25 | A kind of vehicle wheel speed signal condition detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209264746U (en) |
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2018
- 2018-10-25 CN CN201821755694.XU patent/CN209264746U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 450061 Yudao Road, Guancheng District, Zhengzhou City, Henan Province Patentee after: Yutong Bus Co.,Ltd. Address before: 450061 Yudao Road, Guancheng District, Zhengzhou City, Henan Province Patentee before: ZHENGZHOU YUTONG BUS Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder |