CN201368884Y - Speed measurement device for model racer - Google Patents
Speed measurement device for model racer Download PDFInfo
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- CN201368884Y CN201368884Y CNU2009200323159U CN200920032315U CN201368884Y CN 201368884 Y CN201368884 Y CN 201368884Y CN U2009200323159 U CNU2009200323159 U CN U2009200323159U CN 200920032315 U CN200920032315 U CN 200920032315U CN 201368884 Y CN201368884 Y CN 201368884Y
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Abstract
The utility model relates to model racers and discloses a speed measurement device for the model racer. The device comprises: a photoelectric encoder for acquiring the speed of the model racer and outputting a sinusoidal wave signal with the frequency corresponding to the speed; a sinusoidal wave/square wave converting circuit for converting the sinusoidal wave signal output by the photoelectric encoder to a square wave signal; and a frequency/voltage converting circuit for converting the frequency of the square wave signal to analog voltage representing the speed of the model racer.
Description
Technical field
The utility model relates to model racing car, relates in particular to a kind of speed measuring device of model racing car.
Technical background
The model automobile race is a high-tech match, relates to subjects such as electronic technology, control automatically, automobile principle, embedded system.At present, university student's intelligent automobile contests such as auspicious Sa cup, Freescale cup are arranged in colleges and universities, in order to realize the control of the speed of a motor vehicle, its speed-measuring method generally has reflecting light electro-detection, transmission-type Photoelectric Detection and Hall element to detect.The number of pulses that this several method obtained in the unit interval is less, and per second has only tens, maximum tens pulses, and the one more or less pulse often has a significant impact testing result, therefore, has the not high shortcoming of rate accuracy.
The general algorithm that tests the speed is to realize promptly so-called frequency method by the umber of pulse in the accumulative total unit interval.Can use M method, T method or M/T method according to vehicle speed range, the M method is suitable at a high speed, and the T method is suitable for low speed, M/T method between.Because racing car may be quickened or be slowed down at any time in play, the speed of a motor vehicle might be very big, also might be very little, therefore no matter use any method, and all can produce very big error.On the other hand, because the accumulative total umber of pulse realizes that in a period of time if the accumulated time that is provided with is too short, the out of true that then tests the speed if accumulated time is oversize, then can not satisfy the requirement of real-time.
Summary of the invention
The purpose of this utility model is to provide that a kind of circuit is simple, the speed measuring device of good reliability, precision height, model racing car that real-time is good.
In order to reach above-mentioned technical purpose, the utility model is achieved by the following technical solutions.
A kind of speed measuring device of model racing car comprises: photoelectric encoder, and the speed of a motor vehicle of collection model racing car, the frequency of sine wave output signal is corresponding with the speed of a motor vehicle; It is characterized in that, also comprise:
Sine wave/square wave conversion circuit, the sine wave signal that photoelectric encoder is exported is converted into square-wave signal;
The frequency/voltage change-over circuit is the aanalogvoltage of the representative model racing car speed of a motor vehicle with the frequency translation of square-wave signal.
Further characteristics of the present utility model are:
Described sine wave/square wave conversion circuit adopts the LM339 chip.
Described frequency/voltage change-over circuit adopts the LM2907 chip.
Because the utility model adopts the sensor of photoelectric encoder as collection model racing car vehicle wheel rotational speed, the side with during the games, has overcome other sensors shortcoming because of bumping and damaging easily in the racing car process in debugging; Adopt the frequency/voltage change-over circuit, with the frequency translation of square-wave signal is the aanalogvoltage of the representative model car speed of a motor vehicle, has eliminated the needed time of summation pulse, thereby has reduced time delay, reach the purpose of reading speed at any time, improved the real-time of speed of a motor vehicle control.
Description of drawings
Be described in further details of the present utility model below in conjunction with the drawings and specific embodiments.
Fig. 1 is a hardware installation diagram of the present utility model;
Fig. 2 is concrete change-over circuit figure.
Embodiment
The speed measuring device of model racing car of the present utility model mainly comprises: photoelectric encoder, and the speed of a motor vehicle of collection model racing car, the frequency of sine wave output signal is corresponding with the speed of a motor vehicle; Sine wave/square wave conversion circuit, the sine wave signal that photoelectric encoder is exported is converted into square-wave signal; The frequency/voltage change-over circuit is the aanalogvoltage of the representative model racing car speed of a motor vehicle with the frequency translation of square-wave signal.
With reference to Fig. 1, drive motor 2 meshes and wheel 1 coaxial mounted differential gear 6 by its output gear 3, the input gear 5 of the opposite side engagement photoelectric encoder 4 of differential gear 6.Change-over circuit 7 comprises sine wave/square wave conversion circuit and frequency/voltage change-over circuit, is installed on the vehicle frame; Also be provided with control single-chip microcomputer 8 and power supply 9 on the vehicle frame.Photoelectric encoder is used for the tach signal of the drive motor of collection model racing car, through change-over circuit tach signal is converted to analog voltage signal, the A/D module of single-chip microcomputer receives the analog voltage signal that change-over circuit produces, and is converted to and speed of a motor vehicle value corresponding, uses for Single-chip Controlling.
With reference to Fig. 2, in the change-over circuit, sine wave/square wave conversion circuit adopts the LM339 chip, and the frequency/voltage change-over circuit adopts the LM2907 chip.With the REF02 chip serves as that the master is that the LM339 chip provides reference voltage accurately, the pin 2 of REF02 connects+the 7V power supply, pin 4 ground connection, connect the electric capacity of voltage regulation of 10uF between pin 6 and the ground, be connected in series slide resistor R1 between pin 6 and the ground, the output of slide resistor R1 is as the reference voltage input LM339 pin of chip 4 of LM339 chip.The output of photoelectric encoder links to each other with LM339 pin of chip 5 as the input of voltage comparator LM339 chip, and its inverting input is a pin 4, and pin 3 connects+the 5V power supply, pin 12 ground connection, and output terminal is a pin 2, connects 1K resistance between pin 2 and the pin 3.When LM339 chip input voltage Uin＞reference voltage Ur, output terminal (2 pin) is a high level, anyway, be low level, utilize the voltage comparing function of LM339, convert sine wave signal to square-wave signal.
The square-wave signal of LM339 output links to each other with the pin 1 of LM2907.The pin 2 external timing capacitor C1 of LM2907, pin 3 external timing resistance R2 and filter capacitor C2, pin 5 external load resistance R 3, pin 8,9 is connected with+5V power supply respectively, be connected in series 50K, 30K resistance successively between+5V power supply and the ground, the common node of 50K, 30K resistance is connected with pin 11, pin 10 and pin 5 short circuits, and pin 5 provides the output aanalogvoltage of representative model racing car speed.In order to obtain optimum performance, select C1=33nf, C2=2.5uf, R2=50K, R3=1.5K.
The output of change-over circuit directly inserts the A/D mouth of single-chip microcomputer.When system initialization, single-chip microcomputer obtains the speed of a motor vehicle of model racing car and the scale-up factor of aanalogvoltage.When change-over circuit had output signal, single-chip microcomputer multiply by scale-up factor with the numerical value that the A/D mouth is converted to, and can obtain the current model racing car speed of a motor vehicle.Because single-chip microcomputer has only used the A/D mouth, needn't re-use totalizer and the timer paired pulses is counted, thereby save the single-chip microcomputer calculation resources, also eliminate the needed time of summation pulse simultaneously, reduce time delay, reached the purpose of reading speed at any time.
Claims (3)
1, a kind of speed measuring device of model racing car comprises: photoelectric encoder, and the speed of a motor vehicle of collection model racing car, the frequency of sine wave output signal is corresponding with the speed of a motor vehicle; It is characterized in that, also comprise:
Sine wave/square wave conversion circuit, the sine wave signal that photoelectric encoder is exported is converted into square-wave signal;
The frequency/voltage change-over circuit is the aanalogvoltage of the representative model racing car speed of a motor vehicle with the frequency translation of square-wave signal.
2, the speed measuring device of a kind of model racing car according to claim 1 is characterized in that, described sine wave/square wave conversion circuit adopts the LM339 chip.
3, the speed measuring device of a kind of model racing car according to claim 1 is characterized in that, described frequency/voltage change-over circuit adopts the LM2907 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200323159U CN201368884Y (en) | 2009-03-24 | 2009-03-24 | Speed measurement device for model racer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200323159U CN201368884Y (en) | 2009-03-24 | 2009-03-24 | Speed measurement device for model racer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201368884Y true CN201368884Y (en) | 2009-12-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2009200323159U Expired - Fee Related CN201368884Y (en) | 2009-03-24 | 2009-03-24 | Speed measurement device for model racer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201368884Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101770708B (en) * | 2010-01-28 | 2011-11-09 | 公安部交通管理科学研究所 | Simulation testing platform system for researching driving behaviors |
| CN103825247A (en) * | 2014-02-27 | 2014-05-28 | 陕西法士特齿轮有限责任公司 | Auxiliary protection device and method based on vehicle speed detection |
| CN104507002A (en) * | 2014-11-21 | 2015-04-08 | 厦门雅迅网络股份有限公司 | Device and method for realizing automatic volume adjustment based on vehicle speed pulse detection |
-
2009
- 2009-03-24 CN CNU2009200323159U patent/CN201368884Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101770708B (en) * | 2010-01-28 | 2011-11-09 | 公安部交通管理科学研究所 | Simulation testing platform system for researching driving behaviors |
| CN103825247A (en) * | 2014-02-27 | 2014-05-28 | 陕西法士特齿轮有限责任公司 | Auxiliary protection device and method based on vehicle speed detection |
| CN104507002A (en) * | 2014-11-21 | 2015-04-08 | 厦门雅迅网络股份有限公司 | Device and method for realizing automatic volume adjustment based on vehicle speed pulse detection |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091223 Termination date: 20100324 |