CN101793906B - Detection method for output signal of vehicle wheel speed sensor and circuit thereof - Google Patents
Detection method for output signal of vehicle wheel speed sensor and circuit thereof Download PDFInfo
- Publication number
- CN101793906B CN101793906B CN2009102327854A CN200910232785A CN101793906B CN 101793906 B CN101793906 B CN 101793906B CN 2009102327854 A CN2009102327854 A CN 2009102327854A CN 200910232785 A CN200910232785 A CN 200910232785A CN 101793906 B CN101793906 B CN 101793906B
- Authority
- CN
- China
- Prior art keywords
- wheel speed
- signal
- output
- speed sensors
- resistance
- 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.)
- Active
Links
Images
Abstract
The invention relates to a detection method for an output signal of a part of an automobile and a circuit thereof, in particular to a detection method for an output signal of a vehicle wheel speed sensor and a circuit thereof. A sensor signal is divided into a public end and a signal end, wherein the public end sets the public comparison end voltage to be 1/2 of mains voltage by a resistance partial voltage way; the signal end is connected with an adjustable resistor over the ground, and the adjustable resistor is used for load output; sensors of different types are adapted by changing the adjustable resistor; and a sine wave or square wave output by the wheel speed sensor is shaped into a standard square wave through comparing the 1/2 of mains voltage with the signal of the wheel speed sensor by a comparator. The invention is applied to an anti-skid brake system (ABS)/traffic control station (TCS)/electronic stability program (ESP) system of the automobile, can detect not only the signal of a magnetoelectric wheel speed sensor, but also the signal of a Hall type sensor.
Description
Technical field
The present invention relates to the detection method and the circuit thereof of auto parts and components output signal, specifically detection method for output signal of vehicle wheel speed sensor and circuit thereof.
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 matters to be solved by this invention is: at the shortcoming that above prior art exists, propose a kind of detection method for output signal of vehicle wheel speed sensor and the circuit thereof that can unify to handle to dissimilar output signal of vehicle wheel speed sensor.
The technical scheme that the present invention solves above technical matters is:
Detection method for output signal of vehicle wheel speed sensor, carry out according to the following steps:
(1) be common port and signal end with the wheel speed sensors division of signal, common port is by the mode of electric resistance partial pressure, and common port voltage is set to 1/2 supply voltage, and signal end connects adjustable resistance over the ground and exports as load;
(2) when wheel speed sensors is magnetoelectric sensor, adjustable resistance is adjusted to high-impedance state, the magnetoelectric sensor output signal can be ignored by the electric current of adjustable resistance, and output signal is delivered directly to the comparer anode;
(3) when wheel speed sensors is hall sensor, if hall sensor is voltage output, then adjustable resistance is transferred to high resistant, the hall sensor output signal is directly sent into the comparer anode;
(4) when wheel speed sensors is hall sensor, if hall sensor is electric current output, then adjustable resistance is transferred to low resistance, the electric current variation by the adjustable resistance of flowing through brings the comparator signal terminal voltage to change;
(5) by comparer 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.
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.
Detection method for output signal of vehicle wheel speed sensor of the present invention adopts the method for diode clamp at the signal end of wheel speed sensors and common port, with diode with import-restriction greater than power level 0.7V be lower than in the ground level 0.7V scope.After the wheel speed sensors signal compared through comparer, signal also carried out shaping by a general not gate, makes the rising delay of signal and fall delay quick as far as possible.
Output signal of vehicle wheel speed sensor testing circuit of the present invention, 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.
Advantage of the present invention is: the present invention is the circuit that can detect the vehicle wheel speed sensor of magneto-electric and Hall-type simultaneously, is applied in automobile ABS/TCS/ESP system, can detect magneto-electric wheel speed sensors signal and can detect the hall sensor signal again.Detection method for output signal of vehicle wheel speed sensor of the present invention and circuit thereof can conveniently carry out manual adjustment at the different model sensor, and need not change any circuit, have saved the time and the funds of system matches.Circuit of the present invention adopts the mature and reliable module to build, and is simple and practical, has good reliability.
Description of drawings
Fig. 1 is a circuit diagram of the present invention.
Embodiment
Embodiment one
Detection method for output signal of vehicle wheel speed sensor of the present invention 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.
Among the present invention 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 among the present invention, 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.
Among the present invention, 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 present invention can also have other embodiment, and the technical scheme that equal replacement of all employings or equivalent transformation form all drops within the scope of protection of present invention.
Claims (10)
1. detection method for output signal of vehicle wheel speed sensor is characterized in that: carry out according to the following steps:
(1) be common port and signal end with the wheel speed sensors division of signal, common port is by the mode of electric resistance partial pressure, and common port voltage is set to 1/2 supply voltage, and signal end connects adjustable resistance over the ground and exports as load;
(2) when wheel speed sensors is magnetoelectric sensor, adjustable resistance is adjusted to high-impedance state, the magnetoelectric sensor output signal can be ignored by the electric current of adjustable resistance, and output signal is delivered directly to the comparer anode;
(3) when wheel speed sensors is hall sensor, if hall sensor is voltage output, then adjustable resistance is transferred to high resistant, the hall sensor output signal is directly sent into the comparer anode;
(4) when wheel speed sensors is hall sensor, if hall sensor is electric current output, then adjustable resistance is transferred to low resistance, the electric current variation by the adjustable resistance of flowing through brings the comparator signal terminal voltage to change;
(5) by comparer 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.
2. detection method for output signal of vehicle wheel speed sensor as claimed in claim 1, it is characterized in that: adopt the method for diode clamp at the signal end of wheel speed sensors and common port, with diode with import-restriction greater than power level 0.7V be lower than in the ground level 0.7V scope.
3. detection method for output signal of vehicle wheel speed sensor as claimed in claim 1, it is characterized in that: after the wheel speed sensors signal compares through comparer, signal also carries out shaping by a general not gate, makes the rising delay of signal and fall delay quick as far as possible.
4. 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 w2 output of wheel speed sensors 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 the input end of voltage comparator U1A; The signal end w1 output of wheel speed sensors 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 the general not gate U2A shaping.
5. output signal of vehicle wheel speed sensor testing circuit as claimed in claim 4, it is characterized in that: the Third Road output of the common port w2 of described wheel speed sensors 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 w1 of described wheel speed sensors is used to prevent be divided into three tunnel outputs behind the excessive current-limiting resistance R1 of input current by one.
6. output signal of vehicle wheel speed sensor testing circuit as claimed in claim 4, 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.
7. output signal of vehicle wheel speed sensor testing circuit as claimed in claim 4 is characterized in that: be connected to an amplifier feedback resistance R7 between 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.
8. output signal of vehicle wheel speed sensor testing circuit as claimed in claim 4 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.
9. output signal of vehicle wheel speed sensor testing circuit as claimed in claim 4 is characterized in that: described voltage comparator U1A is LM339.
10. output signal of vehicle wheel speed sensor testing circuit as claimed in claim 4 is characterized in that: described not gate U2A is 74HC14.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102327854A CN101793906B (en) | 2009-12-01 | 2009-12-01 | Detection method for output signal of vehicle wheel speed sensor and circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102327854A CN101793906B (en) | 2009-12-01 | 2009-12-01 | Detection method for output signal of vehicle wheel speed sensor and circuit thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101793906A CN101793906A (en) | 2010-08-04 |
| CN101793906B true CN101793906B (en) | 2011-09-14 |
Family
ID=42586712
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009102327854A Active CN101793906B (en) | 2009-12-01 | 2009-12-01 | Detection method for output signal of vehicle wheel speed sensor and circuit thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101793906B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101901189B1 (en) * | 2014-04-16 | 2018-11-02 | 주식회사 만도 | Signal processing device for wheel speed sensor |
| CN105223374B (en) * | 2015-09-21 | 2019-09-06 | 中国北方车辆研究所 | A kind of flexible circuit of tach signal |
| CN107255732A (en) * | 2017-06-09 | 2017-10-17 | 四川新川航空仪器有限责任公司 | Measure the tachometric survey circuit of magnetic tachometer sensor signal |
| CN107561305A (en) * | 2017-08-29 | 2018-01-09 | 潍柴动力股份有限公司 | Rotation speed signal processing circuit of engine and speed probe type detection method |
| CN111439202B (en) * | 2020-04-24 | 2021-11-26 | 江西江铃集团新能源汽车有限公司 | Pedestrian warning method and system for electric vehicle |
| CN114859071A (en) * | 2022-06-14 | 2022-08-05 | 北京斯年智驾科技有限公司 | Wheel speed acquisition module, device and method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4110676A (en) * | 1976-08-30 | 1978-08-29 | Reliance Electric Company | Dynamoelectric machine and tachometer |
| CN101504422A (en) * | 2009-03-20 | 2009-08-12 | 南京特能电子有限公司 | Fan speed measurement method and apparatus |
| CN201600383U (en) * | 2009-12-02 | 2010-10-06 | 南京汽车集团有限公司 | Automobile wheel speed sensor output signal detection circuit |
-
2009
- 2009-12-01 CN CN2009102327854A patent/CN101793906B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4110676A (en) * | 1976-08-30 | 1978-08-29 | Reliance Electric Company | Dynamoelectric machine and tachometer |
| CN101504422A (en) * | 2009-03-20 | 2009-08-12 | 南京特能电子有限公司 | Fan speed measurement method and apparatus |
| CN201600383U (en) * | 2009-12-02 | 2010-10-06 | 南京汽车集团有限公司 | Automobile wheel speed sensor output signal detection circuit |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2005-134283A 2005.05.26 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101793906A (en) | 2010-08-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101793906B (en) | Detection method for output signal of vehicle wheel speed sensor and circuit thereof | |
| CN204641663U (en) | A kind of safety belt reminding device | |
| CN102627115B (en) | Method and device for monitoring vehicle coming on railway based on geomagnetic anomaly | |
| CN105774782B (en) | A kind of wheel speed transducing signal processing circuit and automobile ABS system | |
| CN201600383U (en) | Automobile wheel speed sensor output signal detection circuit | |
| CN204302301U (en) | Wireless wheel speed sensors | |
| CN207916749U (en) | A kind of chassis electrical control system | |
| CN106357111A (en) | Vehicle-mounted DC/DC (direct current/direct current) output voltage feedback circuit and electric vehicle | |
| CN204007789U (en) | Signal processing module based on liquid level sensor | |
| CN106680537A (en) | Diagnosis and self-protection circuit for Hall current sensors | |
| CN103963723B (en) | The acquisition system of effective speed of vehicle and acquisition methods thereof | |
| CN207650383U (en) | A kind of transformer disconnection detection circuit of breaker | |
| WO2019104706A1 (en) | Charging pile control module | |
| 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 | |
| CN203178743U (en) | Protection circuit for signal acquisition of current or voltage sensors | |
| CN204279295U (en) | A kind of lead-out terminal monitoring circuit of electrobus control system | |
| CN104870275A (en) | Method for detecting a speed in a vehicle | |
| CN204145529U (en) | A kind of master-slave mode CAN module | |
| CN208277864U (en) | A kind of current sensor control device and electric car | |
| CN208076688U (en) | A kind of air-conditioning system power quality detecting system | |
| CN105372469A (en) | Method for adjusting measuring range of current sensor and sensor utilizing the method | |
| CN207283514U (en) | A kind of active differential pulse is tested the speed filter circuit | |
| CN105259401A (en) | Air conditioning load current detection device and system | |
| CN205608166U (en) | Magnetic field intensity detection circuitry |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |