CN203299222U - An automobile magnetoelectric wheel speed sensor signal processing circuit - Google Patents
An automobile magnetoelectric wheel speed sensor signal processing circuit Download PDFInfo
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- CN203299222U CN203299222U CN2013203425288U CN201320342528U CN203299222U CN 203299222 U CN203299222 U CN 203299222U CN 2013203425288 U CN2013203425288 U CN 2013203425288U CN 201320342528 U CN201320342528 U CN 201320342528U CN 203299222 U CN203299222 U CN 203299222U
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Abstract
The utility model relates to an automobile magnetoelectric wheel speed sensor signal processing circuit comprising a current input device, a clamping circuit, a comparator, a threshold voltage adjusting circuit, and a microcontroller. The current input device is electrically connected with a magnetoelectric wheel speed sensor. The current input device, the clamping circuit, the comparator, and the threshold voltage adjusting circuit are connected electrically and successively. The comparator is also electrically connected with the microcontroller. The automobile magnetoelectric wheel speed sensor signal processing circuit is capable of processing a signal generated by a measured device accurately. Especially when an automobile operates at low speed and at high speed, the magnetoelectric wheel speed sensor signal processing circuit is still capable of operating normally and converting a wheel speed signal into a level signal which can be identified by a MCU controller so as to accurately measure the speed of the automobile.
Description
Technical field
The utility model relates to vehicle electric field, more particularly, relates to a kind of magneto-electric type wheel speed sensor signal processing circuit.
Background technology
Alternating signal wave amplitude and the frequency of automobile-used magnetoelectric sensor output are directly proportional to vehicle wheel rotational speed, and namely the speed of a motor vehicle is slower, and wave amplitude and the frequency of output signal are all less, otherwise the speed of a motor vehicle is faster, and output signal wave amplitude and frequency are larger.At present, use magnetoelectric sensor to be generally 15-160km/h to the effective range that wheel tests the speed both at home and abroad, but the requirement of testing the speed when this often is not sufficient to meet vehicle operating, in fact in car running process the desirable scope of testing the speed should to reach 8-260km/h even larger.Corresponding such area requirement that tests the speed, generally there is defect in the signal processing circuit of existing magneto-electric type wheel speed sensor on performance.For example, during low vehicle speeds, the output signal wave amplitude of sensor only has tens millivolts, wants accurately to capture so small signal and is not easy very much; During high vehicle speeds, the wave amplitude of the output signal of sensor but can reach tens volts, and so high voltage directly is added to the MCU(microcontroller) on cause possibly MCU to burn.
A good wheel speed signal treatment circuit, should possess simultaneously height wave amplitude signal all is converted into the function of TTL signal accurately, and signal amplitude guarantees the function that late-class circuit is not burnt when high.As seen, the performance of wheel speed signal treatment circuit is to weigh the key index of the performance of a measuring vehicle speed device.And prior art becomes the key factor of restriction measuring vehicle speed device performance for using circuit kit while this signal that differs nearly thousand times of compatible processing to have difficulties.
Summary of the invention
The technical problems to be solved in the utility model is, for the deficiencies in the prior art, design a kind of magneto-electric type wheel speed sensor signal processing circuit, can process accurately the signal that tested device produces in wider scope, especially in the situation that automobile low speed and high-speed cruising, the magneto-electric type wheel speed sensor signal processing circuit still can work, and wheel speed signal is converted to the discernible level signal of MCU controller, thereby measures exactly the speed of a motor vehicle.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of magneto-electric type wheel speed sensor signal processing circuit, be used for modifying the alternating voltage signal of processing magnetoelectric sensor output, the minimum value of output signal and maximal value all are in the discernible range of MCU.And being shaped as the Transistor-Transistor Logic level signal that MCU uses, described magneto-electric type wheel speed sensor signal processing circuit comprises current injection device, clamp circuit, comparer, threshold voltage Circuit tuning and microcontroller; Described current injection device, clamp circuit, comparer, threshold voltage Circuit tuning are electrically connected successively, and described comparer also is electrically connected with described microcontroller.
described comparer is used for and will be converted to level signal and outputs to microcontroller through the input alternating voltage signal of described clamp circuit adjustment, and the burr of the described superimposed voltage signal of filtering, described microcontroller is used for calculating vehicle wheel rotational speed according to the level signal that receives, described threshold voltage Circuit tuning is for the magnitude of voltage of the threshold voltage of adjusting described comparer, adopt a kind of mode of positive feedback, set first threshold for the input voltage that negative sense successively decreases, set Second Threshold for the input voltage that forward increases progressively, when the value of the input voltage that negative sense successively decreases by greater than the first threshold change in voltage in the process less than first threshold voltage, transition occurs in the output level of described comparer when the value of input voltage equals first threshold voltage, when the value of the input voltage that forward increases progressively by less than the Second Threshold change in voltage in the process greater than Second Threshold voltage, transition occurs in the output level of described comparer when the value of input voltage equals Second Threshold voltage.Described first threshold voltage and described Second Threshold voltage do not wait, and its difference size is between 1 volt to 3 volts.
Described current injection device is used for injecting DC current to described magneto-electric type wheel speed sensor signal processing circuit, described current injection device comprises direct supply and boost resistor, described direct supply is connected with boost resistor, the electric current of direct supply output is flowed through after boost resistor, form an auxiliary voltage, the voltage that described auxiliary voltage and described magneto-electric type wheel speed sensor produce superposes and forms superimposed voltage.the voltage that described superimposed voltage produces than described magneto-electric type wheel speed sensor, its phase place is drawn high to specified altitude assignment, be the mean value that the mean value of described superimposed voltage equals described first threshold voltage and Second Threshold voltage, make described comparer can identify more low speed signal, the voltage that produces due to described magneto-electric type wheel speed sensor is that an average is 0 alternating voltage, therefore the mean value of described superimposed voltage equals described auxiliary voltage, therefore, design circuit, make the mean value of first threshold voltage and Second Threshold voltage equal the magnitude of voltage of described auxiliary voltage.
Described clamp circuit is used for described superimposed voltage is adjusted in described comparer and threshold voltage Circuit tuning and the acceptable scope of microcontroller, to play the effect of protection MCU and comparer.
Described comparer is hysteresis loop comparator, its positive input and described threshold voltage Circuit tuning are electrically connected, its negative input and described clamp circuit are electrically connected, and its output terminal and described threshold voltage Circuit tuning are electrically connected, and also with described microcontroller, are electrically connected.Described threshold voltage Circuit tuning comprises a voltage source, is used to comparer that reference voltage is provided; Described threshold voltage Circuit tuning also comprises two resistance that resistance is adjustable: the first resistance and the second resistance, be used for forming the positive feedback structure of comparer, described the first resistance one end and described power supply are electrically connected, and the other end is electrically connected with the positive input of described the second resistance and described comparer simultaneously; Described the second resistance one end is electrically connected with the positive input of described the first resistance and described comparer simultaneously, and the output terminal of the other end and described comparer is electrically connected.The equal capable of regulating of value of the output voltage values of described voltage source and the first resistance and the second resistance, be used for setting described first threshold voltage and Second Threshold voltage, in actual applications, set the resistance of output voltage values and the first resistance and second resistance of described voltage source, make the mean value of first threshold voltage and Second Threshold voltage equal the magnitude of voltage of the auxiliary voltage of current injection device injection circuit, and the difference size of the magnitude of voltage of described first threshold voltage and Second Threshold voltage is between 1 volt to 3 volts.
under the effect of described threshold voltage Circuit tuning, the input voltage that described comparer successively decreases for negative sense is provided with first threshold voltage, the input voltage that increases progressively for forward is provided with Second Threshold voltage, when the value of the input voltage that negative sense successively decreases by greater than the first threshold change in voltage in the process less than first threshold voltage, transition occurs in the output level of described comparer when the value of input voltage equals first threshold voltage, when the value of the input voltage that forward increases progressively by less than the Second Threshold change in voltage in the process greater than Second Threshold voltage, transition occurs in the output level of described comparer when the value of input voltage equals Second Threshold voltage.Therefore the burr of filtering input voltage signal, make the detection of MCU more accurate well.
Described magneto-electric type wheel speed sensor signal processing circuit is owing to comprising current injection device, can be with magneto-electric type wheel speed sensor in the situation that the amplitude of the voltage signal that the automobile slow running produces be brought up to specified scope, thereby can accurately process low speed signal, described magneto-electric type wheel speed sensor signal processing circuit also comprises described clamp circuit, the amplitude of the high amplitude voltage that produces in the time of can be with institute's high-speed running automobile is limited in the scope that comparer and MCU can bear, thereby can accurately process low speed signal.Described comparer is because the input voltage that successively decreases for negative sense has first threshold voltage, and the input voltage that increases progressively for forward has Second Threshold voltage, and the burr of filtering input voltage signal, make the detection of MCU more accurate well.Thus, described magneto-electric type wheel speed sensor signal processing circuit can be processed the signal that tested device produces accurately in wider scope, especially in the situation that the reluctant automobile low speed of common magneto-electric type wheel speed sensor signal processing circuit and high-speed cruising, described magneto-electric type wheel speed sensor signal processing circuit of the present utility model still can be processed the signal that tested device produces accurately, detects exactly the real-time speed of automobile.
Description of drawings
Fig. 1 is the structural drawing of the magnetoelectric wheel speed sensor of car signal processing circuit of the utility model preferred embodiment.
The drawing reference numeral explanation:
1, current injection device
11, direct supply
12, boost resistor
2, clamp circuit
3, comparer
4, threshold voltage Circuit tuning
41, voltage source
42, the first resistance
43, the second resistance
5, microcontroller
Embodiment
The invention will be further described below in conjunction with drawings and Examples.the magneto-electric type wheel speed sensor signal processing circuit of preferred embodiment of the present invention comprises: current injection device 1, clamp circuit 2, comparer 3, threshold voltage Circuit tuning 4, microcontroller 5, during automobilism, rotation along with wheel, produce corresponding alternating voltage in magneto-electric type wheel speed sensor, magneto-electric type wheel speed sensor is connected and is connected by wire with current injection device, current injection device 1 comprises direct supply 11 and boost resistor 12, direct supply 11 is connected with boost resistor 12, the electric current of direct supply 11 outputs is flowed through after boost resistor 12, form an auxiliary voltage, the phase place integral body of the alternating voltage that this auxiliary voltage can produce magneto-electric type wheel speed sensor is brought up in the recognizable set of comparer 3 under threshold voltage Circuit tuning 4 is adjusted, it is superimposed that its effect can be considered voltage and an auxiliary voltage that described magneto-electric type wheel speed sensor is produced, obtain a superimposed voltage, the voltage that described superimposed voltage produces than described magneto-electric type wheel speed sensor, its phase place is increased to specified altitude assignment.Threshold voltage Circuit tuning 4 adopts a kind of mode of feedback, make comparer 3 set a first threshold voltage for the input voltage that negative sense successively decreases, set a Second Threshold voltage for the input voltage that forward increases progressively, and described first threshold voltage and described Second Threshold voltage do not wait, and its difference size is between 1 volt to 3 volts.Particularly, adjust the value of first threshold voltage and Second Threshold voltage, make the mean value of superimposed voltage equal the mean value of described first threshold voltage and Second Threshold voltage.
Current injection device 1 is connected and is connected by wire with clamp circuit; the superimposed voltage that obtains after the voltage that clamp circuit 2 can produce magnetoelectric sensor and auxiliary voltage stack is adjusted in comparer 3 and threshold voltage Circuit tuning 4 and the acceptable scope of MCU, to play the effect of protection MCU and comparer.The negative input b that clamp circuit 2 is connected with comparer connects by wire, the positive input a of comparer 3 and threshold voltage Circuit tuning 4 are electrically connected, comparer 3 output terminal c also with threshold voltage Circuit tuning 4, be electrically connected, output terminal c also is electrically connected with MCU5, voltage transmission after processing by comparer 3 is to MCU5, but the voltage signal that the MCU5 computing receives, obtain the real-time speed of wheel.
As preferred implementation, current injection device 1 is composed in series by the adjustable direct supply 11 of size of current and boost resistor 12, clamp circuit 2 is comprised of clamping diode circuit, comparer 3 is comprised of hysteresis loop comparator, threshold voltage Circuit tuning 4 is positive-feedback circuit, comprise, be used to comparer that the voltage source 41 of reference voltage is provided; Also comprise the first resistance 42 and the second resistance 43 that resistance is adjustable, be used for forming the positive feedback structure of comparer.Wherein said the first resistance 42 1 ends and described power supply 41 are electrically connected, and the other end is electrically connected with the positive input of described the second resistance 43 and described comparer 3 simultaneously; Described the second resistance 43 1 ends are electrically connected with the positive input a of described the first resistance 42 and described comparer 3 simultaneously, and the output terminal c of the other end and described comparer 3 is electrically connected.The equal capable of regulating of value of the output voltage values of described voltage source 41 and the first resistance 42 and the second resistance 43, be used for setting described first threshold voltage and Second Threshold voltage, in actual applications, the resistance of the output voltage values in setting voltage source 41 and the first resistance 42 and the second resistance 43, make the mean value of first threshold voltage and Second Threshold voltage equal the auxiliary voltage of current injection device 1 injection circuit, and the difference size of the magnitude of voltage of described first threshold voltage and Second Threshold voltage is between 1 volt to 3 volts.
The main using method of above-described embodiment is as follows: during automobilism, its existing magneto-electric type wheel speed sensor produces the induced voltage of respective magnitudes and frequency, and the amplitude of described induced voltage and frequency are directly proportional to automobile speed, and namely the speed of a motor vehicle is faster, the amplitude of induced voltage is higher, and frequency is larger.Current injection device 1 in magneto-electric type wheel speed sensor signal processing circuit of the present utility model is to Injection Current in circuit, can form an auxiliary voltage by above-mentioned boost resistor, with described induced voltage stack, form a superimposed voltage, described superimposed voltage is brought up to specified scope with the amplitude of induced voltage, the induced voltage amplitude that has produced while having avoided due to the automobile slow running is too low, can't be compared the situation of device and MCU identification.Described superimposed voltage is under the effect of clamp circuit 2, its amplitude is limited in comparer 3 and threshold voltage Circuit tuning 4 and the acceptable scope of MCU, the induced voltage amplitude that has produced while having avoided due to high-speed running automobile is too high, the situation that makes comparer and MCU not to bear.comparer 3 is under the effect of threshold voltage Circuit tuning 4, be provided with two threshold voltages for described superimposed voltage, the input voltage that negative sense is successively decreased is provided with first threshold voltage, the input voltage that forward is increased progressively is provided with Second Threshold voltage, when the value of the input voltage that negative sense successively decreases by greater than the first threshold change in voltage in the process less than first threshold voltage, transition occurs in the output level of described comparer when the value of input voltage equals first threshold voltage, when the value of the input voltage that forward increases progressively by less than the Second Threshold change in voltage in the process greater than Second Threshold voltage, transition occurs in the output level of described comparer when the value of input voltage equals Second Threshold voltage.Therefore the burr of filtering voltage signal, make the detection of MCU more accurate well; Comparer 3 will be converted to level signal and output to microcontroller 5 through the input alternating voltage signal (superimposed voltage) that clamp circuit 2 is adjusted, and microcontroller 5 carries out calculation process, obtains the real-time speed of a motor vehicle.
Claims (6)
1. magneto-electric type wheel speed sensor signal processing circuit, the alternating voltage signal that produces for the treatment of the magneto-electric type wheel speed sensor of automobile, it is characterized in that, described magneto-electric type wheel speed sensor signal processing apparatus comprises the electric current input media, clamp circuit, comparer, threshold voltage Circuit tuning and microcontroller; Described current injection device and described magneto-electric type wheel speed sensor are electrically connected, and described current injection device, clamp circuit, comparer, threshold voltage Circuit tuning are electrically connected successively, and described comparer also is electrically connected with described microcontroller;
Described current injection device is used for to described magneto-electric type wheel speed sensor signal processing circuit input current, and utilizing the electric current of input to form auxiliary voltage, the alternating voltage signal that this auxiliary voltage and described magneto-electric type wheel speed sensor produce superposes and forms the superimposed voltage signal; Described clamp circuit is used for the magnitude of voltage of described superimposed voltage signal is adjusted in predetermined scope; Described threshold voltage Circuit tuning is for the magnitude of voltage of the threshold voltage that described comparer is set, described comparer is used for and will be converted to level signal and outputs to microcontroller through the described superimposed voltage signal of described clamp circuit adjustment, and the burr of the described superimposed voltage signal of filtering; Described microcontroller is used for calculating vehicle wheel rotational speed according to the level signal that receives.
2. magneto-electric type wheel speed sensor signal processing circuit according to claim 1, it is characterized in that, described current injection device comprises direct supply and the boost resistor of series connection, described direct supply is used for to described magneto-electric type wheel speed sensor signal processing circuit input direct-current electric current, and the electric current of described direct supply output is flowed through described boost resistor and formed described auxiliary voltage.
3. magneto-electric type wheel speed sensor signal processing circuit according to claim 1, it is characterized in that, described comparer is hysteresis loop comparator, its positive input and described threshold voltage Circuit tuning are electrically connected, its negative input and described clamp circuit are electrically connected, its output terminal and described threshold voltage Circuit tuning are electrically connected, and described output terminal also is electrically connected with described microcontroller.
4. the described magneto-electric type wheel speed sensor signal processing circuit of any one according to claim 1 to 3, it is characterized in that, described threshold voltage Circuit tuning comprises that output voltage values is adjustable, be used to comparer that the voltage source of reference voltage is provided, and adjustable the first resistance and the second resistance of resistance, described the first resistance one end and described power supply are electrically connected, and the positive input of the other end and described the second resistance and described comparer is electrically connected; The positive input of described the second resistance one end and described the first resistance and described comparer is electrically connected, and the output terminal of the other end and described comparer is electrically connected.
5. magneto-electric type wheel speed sensor signal processing circuit according to claim 4, it is characterized in that, the input voltage that described threshold voltage Circuit tuning successively decreases to negative sense is provided with first threshold voltage, the input voltage that forward is increased progressively is provided with Second Threshold voltage, when the value of the input voltage that negative sense successively decreases by greater than the first threshold change in voltage in the process less than first threshold voltage, transition occurs in the output level of described comparer when the value of input voltage equals first threshold voltage, when the value of the input voltage that forward increases progressively by less than the Second Threshold change in voltage in the process greater than Second Threshold voltage, transition occurs in the output level of described comparer when the value of input voltage equals Second Threshold voltage.Described first threshold voltage and described Second Threshold voltage do not wait, and the magnitude of voltage of described auxiliary voltage is confirmed as the mean value of described first threshold voltage and described Second Threshold voltage.
6. magneto-electric type wheel speed sensor signal processing circuit according to claim 5, is characterized in that, the difference size of the magnitude of voltage of described first threshold voltage and described Second Threshold voltage is between 1 volt to 3 volts.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013203425288U CN203299222U (en) | 2013-06-14 | 2013-06-14 | An automobile magnetoelectric wheel speed sensor signal processing circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013203425288U CN203299222U (en) | 2013-06-14 | 2013-06-14 | An automobile magnetoelectric wheel speed sensor signal processing circuit |
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| CN203299222U true CN203299222U (en) | 2013-11-20 |
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| CN2013203425288U Expired - Fee Related CN203299222U (en) | 2013-06-14 | 2013-06-14 | An automobile magnetoelectric wheel speed sensor signal processing circuit |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104330583A (en) * | 2014-10-28 | 2015-02-04 | 陕西千山航空电子有限责任公司 | Aircraft engine rotating speed signal acquisition circuit |
| CN105137123A (en) * | 2014-04-16 | 2015-12-09 | 株式会社万都 | Signal processing device for wheel speed sensor |
| 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 |
| CN106794813A (en) * | 2016-11-17 | 2017-05-31 | 深圳市锐明技术股份有限公司 | A kind of conversion match circuit of vehicle speed pulse level |
| CN108089022A (en) * | 2017-11-08 | 2018-05-29 | 陕西航空电气有限责任公司 | A kind of adaptive frequency pressure conversion modulate circuit |
| CN108387806A (en) * | 2017-12-28 | 2018-08-10 | 交控科技股份有限公司 | A kind of detection method of velocity sensor broken string |
| CN112213513A (en) * | 2020-09-23 | 2021-01-12 | 陕西法士特齿轮有限责任公司 | Transmission rotating speed measuring device with specific filtering function and measuring distance adjusting function |
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2013
- 2013-06-14 CN CN2013203425288U patent/CN203299222U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105137123A (en) * | 2014-04-16 | 2015-12-09 | 株式会社万都 | Signal processing device for wheel speed sensor |
| CN105137123B (en) * | 2014-04-16 | 2018-05-01 | 株式会社万都 | The signal processing apparatus of wheel speed sensors |
| CN104330583A (en) * | 2014-10-28 | 2015-02-04 | 陕西千山航空电子有限责任公司 | Aircraft engine rotating speed signal acquisition circuit |
| 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 |
| CN106794813A (en) * | 2016-11-17 | 2017-05-31 | 深圳市锐明技术股份有限公司 | A kind of conversion match circuit of vehicle speed pulse level |
| CN106794813B (en) * | 2016-11-17 | 2019-07-05 | 深圳市锐明技术股份有限公司 | A kind of conversion match circuit of vehicle speed pulse level |
| CN108089022A (en) * | 2017-11-08 | 2018-05-29 | 陕西航空电气有限责任公司 | A kind of adaptive frequency pressure conversion modulate circuit |
| CN108089022B (en) * | 2017-11-08 | 2021-07-16 | 陕西航空电气有限责任公司 | Self-adaptive frequency-voltage conversion conditioning circuit |
| CN108387806A (en) * | 2017-12-28 | 2018-08-10 | 交控科技股份有限公司 | A kind of detection method of velocity sensor broken string |
| CN112213513A (en) * | 2020-09-23 | 2021-01-12 | 陕西法士特齿轮有限责任公司 | Transmission rotating speed measuring device with specific filtering function and measuring distance adjusting function |
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