CN201600383U - Automobile wheel speed sensor output signal detection circuit - Google Patents
Automobile wheel speed sensor output signal detection circuit Download PDFInfo
- Publication number
- CN201600383U CN201600383U CN2009202560958U CN200920256095U CN201600383U CN 201600383 U CN201600383 U CN 201600383U CN 2009202560958 U CN2009202560958 U CN 2009202560958U CN 200920256095 U CN200920256095 U CN 200920256095U CN 201600383 U CN201600383 U CN 201600383U
- Authority
- CN
- China
- Prior art keywords
- output
- wheel speed
- speed sensor
- signal
- voltage comparator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Landscapes
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
The utility model relates to a detection circuit of output signals of automobile parts, in particular to an automobile wheel speed sensor output signal detection circuit which comprises a voltage comparator and an adjustable resistor; the output of a common terminal of a wheel speed sensor is divided into three paths, the first path is connected with a grounding resistor, the second path is connected with a resistor, and the third path is also divided into three-path output, the first path output is connected with a grounding diode, the second path output is connected with a diode, and the third path output is connected with an input end of the voltage comparator; the signal output of the wheel speed sensor is divided into two paths, the first path is connected with a grounding adjustable resistor, the second path is further divided into three-path output, the first path output is connected with the grounding diode, the second path output is connected with a diode, and the third path output is connected with the other end of the voltage comparator; and the output of the voltage comparator is reshaped by a universal not gate and then is taken as output. The automobile wheel speed sensor output signal detection circuit can be applied to an automobile ABS/ TCS/ ESP system, can be used for detecting a magnetic-electric wheel speed sensor signal and a Hall-type sensor signal.
Description
Technical field
The utility model relates to the testing circuit of auto parts and components output signal, specifically the output signal of vehicle wheel speed sensor testing circuit.
Background technology
In the automobile active safety system of using on vehicle (for example ABS/TCS/ESP), wheel speed sensors is indispensable ingredient.Up to the present, wheel speed sensors is divided into two kinds of forms, and a kind of is to adopt the magneto-electric induction principle, promptly twines the mode of lead by permanent magnet, and cutting magnetic line produces sine wave and obtains output, and this mode is output as simulation output; Another is by hall principle, by being applied to the changes of magnetic field of current vertical direction, causes the change-detection wheel speed of current output sensor.In present automobile active safety system, need carry out different processing at dissimilar wheel speed sensors, if the wheel speed sensors of vehicle changes, the hardware that then needs to change controller adapts to the change of sensor, total system needs redesign, brings a large amount of costs to promote.
Summary of the invention
Technical problem to be solved in the utility model is: at the shortcoming that above prior art exists, propose a kind of output signal of vehicle wheel speed sensor testing circuit that can unify to handle to dissimilar output signal of vehicle wheel speed sensor.
The technical scheme that the utility model solves above technical matters is:
The output signal of vehicle wheel speed sensor testing circuit contains one and is used for comparison supply voltage and wheel speed sensors voltage of signals comparer, and one changes the adjustable resistance that adapts to dissimilar wheel speed sensors by resistance; The common port output of wheel speed sensors is divided into three the tunnel, and the first via is connecting resistance over the ground, and the second road connecting resistance, Third Road are divided into three tunnel outputs again, and the first via connects diode over the ground, and the second the tunnel connects diode, and Third Road connects an input end of voltage comparator; The signal end output of wheel speed sensors is divided into two-way, and the first via connects adjustable resistance over the ground, and the second the tunnel is divided into three tunnel outputs again, and the first via connects diode over the ground, and the second the tunnel connects diode, and Third Road connects another input end of voltage comparator; Conduct was exported after a general not gate shaping was passed through in the output of voltage comparator.
Output signal of vehicle wheel speed sensor testing circuit of the present utility model, the Third Road output of the common port of wheel speed sensors is by being divided into three tunnel outputs behind the current-limiting resistance, also by being divided into three tunnel outputs behind the current-limiting resistance, current-limiting resistance is used to prevent that the input comparator electric current is excessive in the second tunnel output of the signal end of wheel speed sensors.On the current-limiting resistance and be connected with a filter capacitor, also and be connected with a filter capacitor, also be connected to a filter capacitor between two input ends of voltage comparator on the adjustable resistance, the filter capacitor effect is the high frequency interference of filtered signal end.Be connected to an amplifier feedback resistance between the input end that voltage comparator links to each other with the wheel speed sensors signal end and the output terminal of voltage comparator.The output terminal of voltage comparator also and be connected with a pull-up resistor that electric current is provided for signal output.
The utility model has the advantages that: the utility model is the circuit that can detect the vehicle wheel speed sensor of magneto-electric and Hall-type simultaneously, be applied in automobile ABS/TCS/ESP system, can detect magneto-electric wheel speed sensors signal and can detect the hall sensor signal again.Output signal of vehicle wheel speed sensor testing circuit of the present utility model can conveniently carry out manual adjustment at the different model sensor, and need not change any circuit, has saved the time and the funds of system matches.
Description of drawings
Fig. 1 is a circuit diagram of the present utility model.
Embodiment
Embodiment one
The utility model is divided into common port and signal end with sensor signal.Common port w2 can be by the mode of resistance R 3 and R4 dividing potential drop, and public relatively terminal voltage is set to 1/2 supply voltage.Signal end w1 then meets adjustable resistance Rs over the ground and exports as load, and the change by adjustable resistance Rs adapts to sensors of various types.When being magnetoelectric sensor, because this exports sensor as the sine voltage signal, so adjustable resistance Rs is adjusted to high-impedance state, this moment, signal can be ignored by the electric current of adjustable resistance Rs, and signal can be regarded as and be delivered directly to comparer U1A anode; When sensor is hall sensor, if Hall element is voltage output, then can be about to adjustable resistance Rs and transfer to high resistant with reference to the similar processing of magnetoelectric transducer, signal is directly sent into comparer U1A anode.If Hall element is electric current output, then adjustable resistance Rs is transferred to low resistance, the electric current variation by the adjustable resistance Rs that flows through brings comparer U1A signal end voltage to change.For 1/2 the supply voltage and the comparison of wheel speed sensors signal, the sine wave or the square wave of wheel speed sensors output is shaped to the standard square wave by comparer U1A.
In the utility model because sensor signal changes amplitude greatly; so method at signal end w1 and common port w2 employing diode clamp; with diode D1, D2, D3, D4 with import-restriction greater than power level 0.7V be lower than in the ground level 0.7V scope, protect general amplifier not breakdown.
After the wheel speed sensors signal compared through comparer U1A in the utility model, signal also carried out shaping by a general not gate U2A, makes the rising delay of signal and fall delay quick as far as possible.
In the utility model, current-limiting resistance R1 and R2 prevent that input comparator U1A electric current is excessive, can change the slope that signal changes by the size of revising amplifier feedback resistance R7.Pull-up resistor R8 provides electric current for signal output.Filter capacitor C1, C2, C3 effect are the high frequency interference of filtered signal end.
The circuit diagram of present embodiment as shown in Figure 1, the output signal of vehicle wheel speed sensor testing circuit, the common port of wheel speed sensors (w2) output is divided into three the tunnel, the first via is connecting resistance (R3) over the ground, the second road connecting resistance (R4), Third Road are divided into three tunnel outputs again, and the first via connects diode (D3) over the ground, the second the tunnel connects diode (D4), and Third Road connects an input end of voltage comparator (U1A); The signal end of wheel speed sensors (w1) output is divided into two-way, the first via connects adjustable resistance (Rs) over the ground, and the second the tunnel is divided into three tunnel outputs again, and the first via connects diode (D2) over the ground, the second the tunnel connects diode (D1), and Third Road connects another input end of voltage comparator (U1A); The output of voltage comparator (U1A) is by conduct output after a general not gate (U2A) shaping.
The Third Road output of the common port of wheel speed sensors (w2) is used to prevent be divided into three tunnel outputs behind the excessive current-limiting resistance of input current (R2) by one, and the second tunnel output of the signal end of wheel speed sensors (w1) is used to prevent be divided into three tunnel outputs behind the excessive current-limiting resistance of input current (R1) by one.
A filter capacitor (C2) that is used for filtered signal end high frequency interference is gone up and be connected with to resistance (R3), adjustable resistance (Rs) is gone up and is connected with a filter capacitor (C1) that is used for filtered signal end high frequency interference, is connected to a filter capacitor (C3) that is used for filtered signal end high frequency interference between two input ends of voltage comparator (U1A).
Be connected to an amplifier feedback resistance (R7) between the input end that voltage comparator (U1A) links to each other with wheel speed sensors signal end (w1) and the output terminal of voltage comparator (U1A).
The output terminal of voltage comparator (U1A) also and be connected with a pull-up resistor (R8) that electric current is provided for signal output.
In the present embodiment, system's power supply is 5V, and R1, R2, R3, R4 all adopt 10k resistance, and adjustable resistance Rs is that 0-10K is adjustable, and R7 is 560K, and R8 is the 5K pull-up resistor.Comparer adopts LM339, and not gate is 74HC14.This moment, common port voltage was limited in 2.5V.Dividing below divides three kinds of situations to handle at sensor type.
Situation 1: when sensor type was magnetoelectric sensor, because sensor internal is formed around the coiling of magnet multi-turn by lead, so the sensor internal circuit can be considered an inductance, establishing its output voltage was V1, and amplitude is 0.3V-40V.When common port voltage was decided to be 2.5V, signal end voltage was the stack amount of 2.5V and sine voltage.Need be set at high-impedance state this moment with Rs, and such as 10k, this moment, the electric current by Rs was 4 microamperes, can ignore.By the comparison to 2.5V, comparer can convert sine wave to square wave, through obtaining the standard square wave after the not gate 74HC14 shaping.
Situation 2:, adjustable resistance is adjusted to suitable voltage the electric current variation can be changed into change in voltage when sensor type is the current type Hall element.AD22157 sensor with ADI company is an example, this current output sensor pulse 0 state is 7mA, 1 state is 14mA, so the adjustable resistance resistance is adjusted to 250 ohm, then W1 signal end low level is 1.75V, high level is 3.5V, can obtain the output of standard square wave by comparer to the comparison of 2.5V benchmark.
Situation 3: when sensor type is the voltage-type Hall element, be sensor internal integrated pull-up resistor, convert current signal to voltage signal, so can be with reference to situation 1, adjustable resistance is adjusted to high-impedance state, allows signal directly insert the comparer anode and compare and to obtain standard square wave output.
More than three kinds of situation processing modes specifically see Table 1.
Table 1
| Sensor type | Adjustable resistance resistance (Rs) | Output | |
| Situation one | Magnetoelectric sensor | 10 kilo-ohms | The 0-5V square wave |
| Situation two | Hall sensor (current mode) | 250 Europe | The 0-5V square wave |
| Situation three | Hall sensor (voltage-type) | 10 kilo-ohms | The 0-5V square wave |
More than 3 kinds of situations comprised the processing mode of most wheel speed sensors in the present active safety systems of vehicles, can conveniently carry out manual adjustment at the different model sensor, and need not change any circuit, save the time and the funds of system matches.
The utility model can also have other embodiment, and the technical scheme that equal replacement of all employings or equivalent transformation form all drops within the claimed scope of the utility model.
Claims (6)
1. output signal of vehicle wheel speed sensor testing circuit is characterized in that: contain one and be used for comparison supply voltage and wheel speed sensors voltage of signals comparer (U1A), one changes the adjustable resistance Rs that adapts to dissimilar wheel speed sensors by resistance; The common port of wheel speed sensors (w2) output is divided into three the tunnel, and the first via is connecting resistance R3 over the ground, the second road connecting resistance R4, Third Road is divided into three tunnel outputs again, the first via meets diode D3 over the ground, and the second the tunnel meets diode D4, and Third Road connects an input end of voltage comparator (U1A); The signal end of wheel speed sensors (w1) output is divided into two-way, and the first via meets adjustable resistance Rs over the ground, and the second the tunnel is divided into three tunnel outputs again, and the first via meets diode D2 over the ground, and the second the tunnel meets diode D1, and Third Road connects another input end of voltage comparator (U1A); The output of described voltage comparator (U1A) is by conduct output after a general not gate (U2A) shaping.
2. output signal of vehicle wheel speed sensor testing circuit as claimed in claim 1, it is characterized in that: the Third Road output of the common port of described wheel speed sensors (w2) is used to prevent be divided into three tunnel outputs behind the excessive current-limiting resistance R2 of input current by one, and the second tunnel output of the signal end of described wheel speed sensors (w1) is used to prevent be divided into three tunnel outputs behind the excessive current-limiting resistance R1 of input current by one.
3. output signal of vehicle wheel speed sensor testing circuit as claimed in claim 1, it is characterized in that: on the described resistance R 3 and be connected with a filter capacitor C2 who is used for filtered signal end high frequency interference, described adjustable resistance Rs goes up and is connected with a filter capacitor C1 who is used for filtered signal end high frequency interference, is connected to a filter capacitor C3 who is used for filtered signal end high frequency interference between two input ends of described voltage comparator (U1A).
4. output signal of vehicle wheel speed sensor testing circuit as claimed in claim 1 is characterized in that: be connected to an amplifier feedback resistance R7 between the input end that described voltage comparator (U1A) links to each other with wheel speed sensors signal end (w1) and the output terminal of voltage comparator (U1A).
5. output signal of vehicle wheel speed sensor testing circuit as claimed in claim 1 is characterized in that: the output terminal of described voltage comparator (U1A) also and be connected with a pull-up resistor R8 that electric current is provided for signal output.
6. output signal of vehicle wheel speed sensor testing circuit as claimed in claim 1 is characterized in that: described not gate (U2A) is 74HCl4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202560958U CN201600383U (en) | 2009-12-02 | 2009-12-02 | Automobile wheel speed sensor output signal detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202560958U CN201600383U (en) | 2009-12-02 | 2009-12-02 | Automobile wheel speed sensor output signal detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201600383U true CN201600383U (en) | 2010-10-06 |
Family
ID=42811447
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202560958U Expired - Lifetime CN201600383U (en) | 2009-12-02 | 2009-12-02 | Automobile wheel speed sensor output signal detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201600383U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101793906B (en) * | 2009-12-01 | 2011-09-14 | 南京汽车集团有限公司 | Detection method for output signal of vehicle wheel speed sensor and circuit thereof |
| CN104952238A (en) * | 2015-06-15 | 2015-09-30 | 武汉合康动力技术有限公司 | Driving speed collection circuit based on RS422 chip |
| 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 |
-
2009
- 2009-12-02 CN CN2009202560958U patent/CN201600383U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101793906B (en) * | 2009-12-01 | 2011-09-14 | 南京汽车集团有限公司 | Detection method for output signal of vehicle wheel speed sensor and circuit thereof |
| CN104952238A (en) * | 2015-06-15 | 2015-09-30 | 武汉合康动力技术有限公司 | Driving speed collection circuit based on RS422 chip |
| CN104952238B (en) * | 2015-06-15 | 2018-08-24 | 武汉合康动力技术有限公司 | One kind realizing speed data collection circuit based on RS422 chips |
| 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 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101793906B (en) | Detection method for output signal of vehicle wheel speed sensor and circuit thereof | |
| CN102627115B (en) | Method and device for monitoring vehicle coming on railway based on geomagnetic anomaly | |
| CN201600383U (en) | Automobile wheel speed sensor output signal detection circuit | |
| CN203299222U (en) | An automobile magnetoelectric wheel speed sensor signal processing circuit | |
| US11131720B2 (en) | Electronic control device | |
| CN204302301U (en) | Wireless wheel speed sensors | |
| CN105913628B (en) | Magnetic Sensor output circuit and data wireless transmission and control system method | |
| CN210442425U (en) | Novel current sampling conditioning circuit | |
| CN107976993A (en) | Acceleration pedal of electric automobile signal denoising and microwave treatment circuit | |
| WO2019104706A1 (en) | Charging pile control module | |
| CN113865689B (en) | Vibration signal charge amplifier fault detection method | |
| CN105318892A (en) | A railway wheel sensor signal nonpolarity receiving and processing circuit and an integrated chip | |
| CN202548249U (en) | Electric leakage detection device for electric vehicle | |
| CN104870275A (en) | Method for detecting a speed in a vehicle | |
| CN204210442U (en) | A kind of braking automobile controller electromagnetic valve coil control circuit | |
| CN209728467U (en) | Analogue signal acquisition circuit and entire car controller based on entire car controller | |
| CN203178743U (en) | Protection circuit for signal acquisition of current or voltage sensors | |
| CN208953949U (en) | New-energy automobile calibration tool system | |
| CN208277864U (en) | A kind of current sensor control device and electric car | |
| CN205608166U (en) | Magnetic field intensity detection circuitry | |
| CN106373407A (en) | Vehicle detector based on geomagnetic sensing | |
| CN202916689U (en) | Improved landmark sensor | |
| CN105259401A (en) | Air conditioning load current detection device and system | |
| CN202686391U (en) | Railway train approach monitoring device based on geomagnetic anomaly | |
| CN204789950U (en) | Electric current acquisition circuit based on divide flowmeter type sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20101006 Effective date of abandoning: 20091202 |