CN209248014U - A kind of electronic velocity measuring system - Google Patents
A kind of electronic velocity measuring system Download PDFInfo
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- CN209248014U CN209248014U CN201822145715.2U CN201822145715U CN209248014U CN 209248014 U CN209248014 U CN 209248014U CN 201822145715 U CN201822145715 U CN 201822145715U CN 209248014 U CN209248014 U CN 209248014U
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- operational amplifier
- speed
- input terminal
- inverting input
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Abstract
A kind of electronic velocity measuring system of the utility model, speed comparison circuit connect averaging circuit, averaging circuit connection hypervelocity decision circuitry；Efficiently solve vehicle flowrate it is big when, due to speed superposition cause accidentally overspeed snapping the problem of.The utility model speed signal is through filtering, after amplification, subtraction is carried out with abnormal vehicle speed, export difference signal, when difference signal is positive and is higher than the conducting voltage 0.3V of triode Q1, tentatively judge that speed is superimposed, triode Q1 conducting, speed signal carries out ratio decaying through proportional amplifier, the ratio wherein to decay is controlled by vehicle flowrate signal, obtain the corresponding speed signal of average traffic, it is compared with high threshold voltage and low threshold voltage, further determine whether that speed is superimposed, low level is exported in normal vehicle speed range, host is transmitted to after eliminating shake, identify host without hypervelocity, and then without overspeed snapping, avoid vehicle flowrate it is big when cause speed to be superimposed, the problem of causing hypervelocity accidentally without capturing.
Description
Technical field
The utility model relates to motor vehicle radar velocity measurement technical field, especially a kind of electronic velocity measuring system.
Background technique
Detection speed is one of the technological means used in expressway safety technology, and traffic police is high in the accident of highway
It sends out section and disposes fixed or mobile speed measuring point, detect and record the hypervelocity behavior of vehicle, contained by punitive measures by surpassing
The traffic accident that speed generates, common motor vehicle speed measuring technology has laser velocimeter, ground sensing coil speed measuring, ultrasonic wave both at home and abroad at present
It tests the speed, radar velocity measurement, since radar velocity measurement radar beam shadow surface is big, easily capture target, precision height are widely adopted, however,
When vehicle flowrate is big (when two or more vehicles while admission velocity monitoring acquisition zone), due to radar beam multiple reflections, sometimes
Speed superposition can be generated, makes the vehicle not exceeded the speed limit originally because speed superposition regards overspeed snapping by radar.
Therefore the utility model provides a kind of new scheme to solve the problems, such as this.
Utility model content
In view of the deficienciess of the prior art, the utility model aim is to provide a kind of electronic velocity measuring system, effectively solve
When vehicle flowrate of having determined is big, since speed superposition causes the problem of missing overspeed snapping.
Its technical solution solved is, including speed comparison circuit, averaging circuit, hypervelocity decision circuitry, feature exist
In speed comparison circuit connects averaging circuit, averaging circuit connection hypervelocity decision circuitry；
The averaging circuit includes capacitor C2, resistance R10, and one end of capacitor C2 connects wagon flow with one end of resistance R10
The vehicle flowrate signal of quantity sensor detection, the grid of the other end connection metal-oxide-semiconductor T1 of resistance R10 and the cathode of electrolytic capacitor E1,
The anode of electrolytic capacitor E1 connects ground with the other end of capacitor C2, and the source electrode of metal-oxide-semiconductor T1 is separately connected one end of resistance R9, capacitor
One end of C3, triode Q1 emitter, the other end of resistance R9 connects ground, the drain electrode of metal-oxide-semiconductor T1 with the other end of capacitor C3
Distinguish one end of drain resistance R12, the non-inverting input terminal of operational amplifier AR3, the inverting input terminal of operational amplifier AR3 passes through
Resistance R11 connection ground, the output end of the other end connection operational amplifier AR3 of resistance R12.
After the utility model speed signal is filtered, amplified, subtraction is carried out with abnormal vehicle speed, exports difference signal,
When difference signal is positive and is higher than the conducting voltage 0.3V of triode Q1, tentatively judge that speed is superimposed, triode Q1 conducting, speed
Signal carries out ratio decaying through proportional amplifier, wherein the ratio to decay is controlled by vehicle flowrate signal, show that average traffic is corresponding
Speed signal, be compared with high threshold voltage and low threshold voltage, further determine whether speed be superimposed, in normal speed
Low level is exported when range, is transmitted to host after eliminating shake, identifies host without hypervelocity, and then is grabbed without hypervelocity
Clap, avoid vehicle flowrate it is big when cause speed to be superimposed, cause hypervelocity accidentally without capture the problem of.
Detailed description of the invention
Fig. 1 is the circuit connection module map of the utility model.
Fig. 2 is the circuit connection schematic diagram of the utility model.
Specific embodiment
For aforementioned and other technology contents, feature and effect in relation to the utility model, following cooperation with reference to figures 1 through
Fig. 2 can be clearly presented in the detailed description of embodiment.The structure content being previously mentioned in following embodiment is to say
Bright book attached drawing is reference.
Each exemplary embodiment of the utility model is described below with reference to accompanying drawings.
Embodiment one, a kind of electronic velocity measuring system, speed comparison circuit receive the speed signal of radar meter detection, warp
The scaling circuit for entering operational amplifier AR1, resistance R1- resistance R3 composition after the filtering of LC filter circuit carries out ratio and puts
Greatly, enter operational amplifier AR2 non-inverting input terminal later and inverting input terminal abnormal vehicle speed carries out subtraction, output difference letter
Number, when difference signal is positive and is higher than the conducting voltage 0.3V of triode Q1, triode Q1 is connected, speed signal after ratio enlargement
The CE knot of triode Q1 through being connected is transmitted to the source electrode of metal-oxide-semiconductor T1 in averaging circuit, and the drain electrode through metal-oxide-semiconductor T1 is added to operation
The proportional amplifier progress ratio decaying of amplifier AR3, resistance R12, resistance R11 composition, wherein the ratio to decay is by vehicle flowrate
The vehicle flowrate signal of sensor detection is added to the grid of metal-oxide-semiconductor T1, changes resistance value between metal-oxide-semiconductor T1 drain-source, puts to change ratio
The attenuation ratio of big device utilizes window principle, vehicle to show that the corresponding speed signal of average traffic is sent into hypervelocity decision circuitry
Fast average signal is compared with high threshold voltage and low threshold voltage, low level is exported in normal vehicle speed range, through resistance
R16 and capacitor C4 is transmitted to host after eliminating shake, identifies host without hypervelocity, and then without overspeed snapping, avoids
The problem of vehicle flowrate causes speed to be superimposed when big, causes hypervelocity accidentally without capturing；
The averaging circuit is used for when speed exception, and speed signal enters the source drain through metal-oxide-semiconductor T1 and is added to fortune
The proportional amplifier progress ratio decaying for calculating amplifier AR3, resistance R12, resistance R11 composition, wherein the ratio to decay is by wagon flow
Quantity sensor (can be 24G radar sensor or vehicle flowrate geomagnetism detecting, specific testing principle is the prior art, herein no longer in detail
State)) the vehicle flowrate signal of detection is added to the grid of metal-oxide-semiconductor T1, change resistance value between metal-oxide-semiconductor T1 drain-source, to change ratio enlargement
The attenuation ratio of device, to obtain the corresponding speed signal of average traffic, including capacitor C2, resistance R10, one end of capacitor C2 and
The vehicle flowrate signal of one end connection magnetic-field Sensor for Traffic Counting detection of resistance R10, the grid of the other end connection metal-oxide-semiconductor T1 of resistance R10
The cathode of pole and electrolytic capacitor E1, the anode of electrolytic capacitor E1 connect ground, the source electrode difference of metal-oxide-semiconductor T1 with the other end of capacitor C2
Connect one end of resistance R9, one end of capacitor C3, triode Q1 emitter, the other end of resistance R9 and the other end of capacitor C3
The non-inverting input terminal of one end of drain resistance R12, operational amplifier AR3, operation amplifier are distinguished in connection ground, the drain electrode of metal-oxide-semiconductor T1
By resistance R11 connection, the other end of resistance R12 connects the output end of operational amplifier AR3 to the inverting input terminal of device AR3.
Embodiment two, on the basis of example 1, it (can be 24G thunder that the speed comparison circuit, which receives radar meter,
Up to sensor, specific testing principle be the prior art, this will not be detailed here) detection speed signal, through inductance L1 and capacitor C1
The scaling circuit for entering operational amplifier AR1, resistance R1- resistance R3 composition after the LC filter circuit filtering of composition is compared
Example amplification, to meet requirement of the late-class circuit to signal amplitude, after through resistance R4 be connected to operational amplifier AR2 homophase input
End and the inverting input terminal abnormal vehicle speed of operational amplifier AR2 (the positive 35km/h corresponding voltage of max. speed 180km/h, resistance R6,
The bleeder circuit offer of R7, potentiometer RP1, voltage-stabiliser tube Z1 composition) subtraction is carried out, difference signal is exported, difference signal is
When just and being higher than the conducting voltage 0.3V of triode Q1, triode Q1 is connected, three poles of the speed signal through being connected after ratio enlargement
The CE knot of pipe Q1 is transmitted to averaging circuit, including inductance L1, the speed letter of the left end connection radar meter detection of inductance L1
Number, the right end of inductance L1 is separately connected one end of one end of ground capacity C1, resistance R1, and the other end of resistance R1 is separately connected electricity
One end of R2, the non-inverting input terminal of operational amplifier AR1 are hindered, the inverting input terminal of operational amplifier AR1 is connected by resistance R3
Ground, the output end of operational amplifier AR1 are separately connected one end of the other end of resistance R2, resistance R4, the other end point of resistance R4
Not Lian Jie the non-inverting input terminal of operational amplifier AR2, ground resistance R5 one end, the inverting input terminal of operational amplifier AR2 connects
One end of connecting resistance R8, the adjustable end of the other end connection potentiometer RP1 of resistance R8, the lower end of potentiometer RP1 connects ground, current potential
Device RP1 upper end connection resistance R7 one end, the other end of resistance R7 be separately connected the cathode of voltage-stabiliser tube Z1, resistance R6 one
End, the other end of resistance R6 connect power supply+5V, the anode connection ground of voltage-stabiliser tube Z1, the output end connection three of operational amplifier AR2
The base stage of pole pipe Q1, the non-inverting input terminal of the collector connection operational amplifier AR2 of triode Q1, the VCC of operational amplifier AR2
The end GND of end connection power supply+5V, operational amplifier AR2 connect ground；
The hypervelocity decision circuitry utilizes window principle, by operational amplifier AR4 inverting input terminal and operational amplifier AR5
The speed average signal and operational amplifier AR4 non-inverting input terminal high threshold electricity of the received averaging circuit output of non-inverting input terminal
Pressure and operational amplifier AR5 inverting input terminal low threshold voltage (the partial pressure electricity that threshold voltage is made of resistance R13, R14, R15
The normal speed 60km/h-80km/h in road, specially vehicle corresponding voltage when driving) it is compared, in normal vehicle speed range
Low level is exported, host is transmitted to after resistance R16 and capacitor C4 eliminates shake, identifies host without hypervelocity, and then not
Carry out overspeed snapping, avoid vehicle flowrate it is big when the problem of causing speed to be superimposed, causing hypervelocity accidentally without capturing, including operation amplifier
Device AR4, operational amplifier AR5, the non-inverting input terminal of operational amplifier AR4 are separately connected one end of resistance R13, resistance R14
One end, the other end of resistance R14 are separately connected the inverting input terminal of one end of resistance R15, operational amplifier AR5, operation amplifier
The inverting input terminal of device AR4 connects the output end of operational amplifier AR3 with the non-inverting input terminal of operational amplifier AR5, and operation is put
The output end of big device AR4 connected with the output end of operational amplifier AR5 one end of resistance R16, capacitor C4 one end, be connected to master
The other end of machine, resistance R16 connects ground with the other end of capacitor C4.
The utility model carry out using when, radar meter detection speed signal through LC filter circuit filtering after
The scaling circuit formed into operational amplifier AR1, resistance R1- resistance R3 carries out ratio enlargement, puts later into operation
Big device AR2 non-inverting input terminal and inverting input terminal abnormal vehicle speed carry out subtraction, export difference signal, difference signal be positive and
When conducting voltage 0.3V higher than triode Q1, triode Q1 conducting, triode Q1 of the speed signal through being connected after ratio enlargement
CE knot pass and be added to the source electrode of metal-oxide-semiconductor T1, the drain electrode through metal-oxide-semiconductor T1 is added to operational amplifier AR3, resistance R12, resistance R11 group
At proportional amplifier carry out ratio decaying, wherein the vehicle flowrate signal that the ratio to decay is detected by magnetic-field Sensor for Traffic Counting is added to
The grid of metal-oxide-semiconductor T1 changes resistance value between metal-oxide-semiconductor T1 drain-source, to change the attenuation ratio of proportional amplifier, to obtain average
The corresponding speed signal of vehicle enters window circuit and is compared with high threshold voltage and low threshold voltage, in normal vehicle speed range
When export low level, be transmitted to host after resistance R16 and capacitor C4 eliminate shake, identify host without hypervelocity, in turn
Without overspeed snapping, avoid vehicle flowrate it is big when the problem of causing speed to be superimposed, causing hypervelocity accidentally without capturing.
Claims (2)
1. a kind of electronic velocity measuring system, including speed comparison circuit, averaging circuit, hypervelocity decision circuitry, which is characterized in that vehicle
Speed ratio is compared with circuit connection averaging circuit, averaging circuit connection hypervelocity decision circuitry；
The averaging circuit includes capacitor C2, resistance R10, and one end of capacitor C2 connects vehicle flowrate biography with one end of resistance R10
The vehicle flowrate signal of sensor detection, the grid of the other end connection metal-oxide-semiconductor T1 of resistance R10 and the cathode of electrolytic capacitor E1, electrolysis
The anode of capacitor E1 connects with the other end of capacitor C2, and the source electrode of metal-oxide-semiconductor T1 is separately connected one end of resistance R9, capacitor C3
One end, triode Q1 emitter, the other end of resistance R9 connected with the other end of capacitor C3 ground, metal-oxide-semiconductor T1 drain electrode difference
One end of drain resistance R12, operational amplifier AR3 non-inverting input terminal, the inverting input terminal of operational amplifier AR3 passes through resistance
R11 connection ground, the output end of the other end connection operational amplifier AR3 of resistance R12.
2. a kind of electronic velocity measuring system as described in claim 1, which is characterized in that the speed comparison circuit includes inductance
The speed signal of the left end connection radar meter detection of L1, inductance L1, the right end of inductance L1 are separately connected ground capacity C1's
One end, resistance R1 one end, the other end of resistance R1 is separately connected the homophase input of one end of resistance R2, operational amplifier AR1
End, by resistance R3 connection, the output end of operational amplifier AR1 is separately connected electricity to the inverting input terminal of operational amplifier AR1
The other end of R2, one end of resistance R4 are hindered, the other end of resistance R4 is separately connected the non-inverting input terminal of operational amplifier AR2, connects
One end of ground resistance R5, one end of the inverting input terminal connection resistance R8 of operational amplifier AR2, the other end of resistance R8 connect electricity
The adjustable end of position device RP1, the lower end of potentiometer RP1 connect ground, one end of the upper end connection resistance R7 of potentiometer RP1, resistance R7
The other end be separately connected one end of the cathode of voltage-stabiliser tube Z1, resistance R6, the other end of resistance R6 connects power supply+5V, voltage-stabiliser tube
The anode connection ground of Z1, the collector of the base stage of the output end connecting triode Q1 of operational amplifier AR2, triode Q1 connect fortune
The non-inverting input terminal of amplifier AR2 is calculated, the end VCC of operational amplifier AR2 connects power supply+5V, the end GND of operational amplifier AR2
Connection ground；
The hypervelocity decision circuitry includes operational amplifier AR4, operational amplifier AR5, the non-inverting input terminal of operational amplifier AR4
It is separately connected one end of resistance R13, one end of resistance R14, the other end of resistance R14 is separately connected one end of resistance R15, operation
The inverting input terminal of amplifier AR5, the inverting input terminal of operational amplifier AR4 and the non-inverting input terminal of operational amplifier AR5 connect
The output end of operational amplifier AR3 is connect, the output end of operational amplifier AR4 connects resistance with the output end of operational amplifier AR5
One end of R16, capacitor C4 one end, be connected to host, the other end of resistance R16 connects ground with the other end of capacitor C4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822145715.2U CN209248014U (en) | 2018-12-20 | 2018-12-20 | A kind of electronic velocity measuring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822145715.2U CN209248014U (en) | 2018-12-20 | 2018-12-20 | A kind of electronic velocity measuring system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209248014U true CN209248014U (en) | 2019-08-13 |
Family
ID=67533787
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822145715.2U Expired - Fee Related CN209248014U (en) | 2018-12-20 | 2018-12-20 | A kind of electronic velocity measuring system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209248014U (en) |
-
2018
- 2018-12-20 CN CN201822145715.2U patent/CN209248014U/en not_active Expired - Fee Related
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|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190813 Termination date: 20201220 |
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| CF01 | Termination of patent right due to non-payment of annual fee |