CN208860788U - A kind of vehicle exhaust emission of nitrogen oxide detection system - Google Patents
A kind of vehicle exhaust emission of nitrogen oxide detection system Download PDFInfo
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- CN208860788U CN208860788U CN201820492457.2U CN201820492457U CN208860788U CN 208860788 U CN208860788 U CN 208860788U CN 201820492457 U CN201820492457 U CN 201820492457U CN 208860788 U CN208860788 U CN 208860788U
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Abstract
The utility model discloses a kind of vehicle exhaust emission of nitrogen oxide detection systems in vehicle sensors field, comprising: NO2Detection circuit, to detect the NO in vehicle exhaust2Content；Alarm unit, to NO in tail gas2The exceeded situation of content is alarmed；Display unit, to show NO in tail gas2Content；Microprocessor, to the NO that will test2Content is compared with setting value, and control alarm unit is issued if exceeded and issues alarm signal, while by NO2Content data information is sent to display unit to show；NO2Detection circuit, alarm unit and display unit are electrically connected on microprocessor, and the beneficial effects of the utility model are, the utility model structure is simple, and cost is relatively low, easy to detect, and detection accuracy is high, can be used in automobile emission gas analyzer.
Description
Technical field
The utility model relates to a kind of automobile exhaust detection system, in particular to a kind of nitrogen oxides detection system.
Background technique
According to statistics from the Traffic Management Bureau of the Ministry of Public Security, by the first half of the year in 2016, national vehicle guaranteeding organic quantity is up to 2.85 hundred million, wherein vapour
1.84 hundred million, vehicle.Car ownership keeps rapid growth, and the total amount of pollutant of motor vehicle emission at the same time is also constantly soaring.2015
Year, discharged nitrous oxides total amount cut down 10% proposition than 2010, and motor vehicle discharged nitrous oxides are put into Con trolling index, at
It is the two of the four item constraint index such as electric power, industry, motor vehicle and life.Launch respectively vehicular emission control political affairs in each department
Plan.Automobile exhaust nitrogen oxides detector is the instrument for measuring vehicle discharged nitrous oxides concentration, can have and distinguish high pollution vehicle.
Utility model content
The purpose of the utility model is to provide a kind of vehicle exhaust emission of nitrogen oxide detection systems, and structure is simple, prison
It surveys more convenient.
Purpose of the utility model is realized as follows: a kind of vehicle exhaust emission of nitrogen oxide detection system, comprising:
NO2Detection circuit, to detect the NO in vehicle exhaust2Content；
Alarm unit, to NO in tail gas2The exceeded situation of content is alarmed；
Display unit, to show NO in tail gas2Content；
Microprocessor, to the NO that will test2Content is compared with setting value, and it is single that control alarm is issued if exceeded
Member issues alarm signal, while by NO2Content data information is sent to display unit to show；
The NO2Detection circuit, alarm unit and display unit are electrically connected on microprocessor.
As further limiting for the utility model, the NO2Detection circuit includes 4NO2- 2000 electrochemical sensors,
4NO2- 2,000 7 feet that the first amplifier LM324 is met to electrode C, 4NO2- 2000 reference electrode R connects first through resistance R1 and puts
6 feet of big device LM324,5 feet of the first amplifier LM324 connect reference power source Vref, 6 foot meridian capacitors of the first amplifier LM324
C1 connects 7 feet；4NO2- 2000 working electrode W is grounded through resistance R6,4NO2- 2000 working electrode W also connects the second amplifier
5 feet of LM324,6 feet of the second amplifier LM324 connect 7 feet of the second amplifier LM324 through capacitor C2, resistance R2 in parallel, the
6 feet of two amplifier LM324 are also grounded through resistance R3, and 7 feet of the second amplifier LM324 connect 5 feet of third amplifier LM324,
6 feet of third amplifier LM324 connect 7 feet of third amplifier LM324, third amplifier through capacitor C4, resistance R4 in parallel
6 feet of LM324 are also grounded through resistance R5, and 7 feet of third amplifier LM324 are as output end, and side is connected to filter capacitor C3.
As further limiting for the utility model, the display unit is LCD display screen, and LCD display screen is selected
LR043JC211 liquid crystal display.
As further limiting for the utility model, the alarm unit includes audible alarm unit and flashing light alarm list
Member.
When utility model works, NO2Reduction reaction occurs, working electrode W exports positive current；The electric current of sensor output
Resistance after testing, the voltage value by measuring resistance both ends can obtain current value divided by resistance value, to calculate to obtain nitrogen oxides
Volume fraction；NO2Current output sensor is microampere order, and detection resistance both end voltage value is too small；Amplified using two-stage calculation, it will
2500 times of voltage amplification of detection are converted convenient for A/D, improve precision；Due to the job specification of electrochemical sensor, be tested gas with
When reduction reaction occurs for sensor, the potential difference of working electrode and electrode changes due to exporting the generation of electric current, larger
Potential difference cause the error of measurement result to increase.Working sensor electrode is connect with reference electrode by operational amplifier, is led to
Cross the potential difference between the negative feedback stable reference electrode of operational amplifier and working electrode.Compared with prior art, this reality
It is with novel beneficial effect, the utility model structure is simple, and cost is relatively low, and easy to detect, detection accuracy is high.This is practical new
Type can be used in automobile emission gas analyzer.
Detailed description of the invention
Fig. 1 is the utility model principle block diagram.
Fig. 2 is NO in the utility model2Detection circuit schematic diagram.
Specific embodiment
A kind of vehicle exhaust emission of nitrogen oxide detection system as shown in Figs. 1-2, comprising:
NO2Detection circuit, to detect the NO in vehicle exhaust2Content, NO2Detection circuit includes 4NO2- 2000 electrochemistry
Sensor, 4NO2- 2,000 7 feet that the first amplifier LM324 is met to electrode C, 4NO2- 2000 reference electrode R connects through resistance R1
6 feet of first amplifier LM324,5 feet of the first amplifier LM324 connect reference power source Vref, 6 feet of the first amplifier LM324
7 feet are connect through capacitor C1；4NO2- 2000 working electrode W is grounded through resistance R6,4NO2- 2000 working electrode W also connects second and puts
5 feet of big device LM324,6 feet of the second amplifier LM324 connect the 7 of the second amplifier LM324 through capacitor C2, resistance R2 in parallel
6 feet of foot, the second amplifier LM324 are also grounded through resistance R3, and 7 feet of the second amplifier LM324 connect third amplifier LM324's
5 feet, 6 feet of third amplifier LM324 connect 7 feet of third amplifier LM324, third amplification through capacitor C4, resistance R4 in parallel
6 feet of device LM324 are also grounded through resistance R5, and 7 feet of third amplifier LM324 are as output end, and side is connected to filter capacitor C3；
Alarm unit, to alarm the exceeded situation of NO2 content in tail gas, alarm unit includes audible alarm unit
With flashing light alarm unit；
Display unit, to show NO2 content in tail gas, display unit is LCD display screen, and LCD display screen is selected
LR043JC211 liquid crystal display；
Microprocessor selects S3C2440A processor chips, and NO2 content and setting value will test are compared
Compared with, issued if exceeded control alarm unit issue alarm signal, while by NO2 content data information be sent to display unit use
With display；
NO2Detection circuit, alarm unit and display unit are electrically connected on microprocessor.
When utility model works, NO2Reduction reaction occurs, working electrode W exports positive current；The electric current of sensor output
Resistance after testing, the voltage value by measuring resistance both ends can obtain current value divided by resistance value, to calculate to obtain nitrogen oxides
Volume fraction；NO2Current output sensor is microampere order, and detection resistance both end voltage value is too small；Amplified using two-stage calculation, it will
2500 times of voltage amplification of detection are converted convenient for A/D, improve precision；Due to the job specification of electrochemical sensor, be tested gas with
When reduction reaction occurs for sensor, the potential difference of working electrode and electrode changes due to exporting the generation of electric current, larger
Potential difference cause the error of measurement result to increase.Working sensor electrode is connect with reference electrode by operational amplifier, is led to
Cross the potential difference between the negative feedback stable reference electrode of operational amplifier and working electrode.
The utility model is not limited to above-described embodiment, on the basis of technical solution disclosed by the utility model, this
For the technical staff in field according to disclosed technology contents, not needing creative labor can be special to some of which technology
Sign makes some replacements and deformation, these replacements and deformation are within the protection scope of the present utility model.
Claims (3)
1. a kind of vehicle exhaust emission of nitrogen oxide detection system characterized by comprising
NO2Detection circuit, to detect the NO in vehicle exhaust2Content, the NO2Detection circuit includes 4NO2- 2000 electrochemistry
Sensor, 4NO2- 2,000 7 feet that the first amplifier LM324 is met to electrode C, 4NO2- 2000 reference electrode R connects through resistance R1
6 feet of first amplifier LM324,5 feet of the first amplifier LM324 connect reference power source Vref, 6 feet of the first amplifier LM324
7 feet are connect through capacitor C1；4NO2- 2000 working electrode W is grounded through resistance R6,4NO2- 2000 working electrode W also connects second and puts
5 feet of big device LM324,6 feet of the second amplifier LM324 connect the 7 of the second amplifier LM324 through capacitor C2, resistance R2 in parallel
6 feet of foot, the second amplifier LM324 are also grounded through resistance R3, and 7 feet of the second amplifier LM324 connect third amplifier LM324's
5 feet, 6 feet of third amplifier LM324 connect 7 feet of third amplifier LM324, third amplification through capacitor C4, resistance R4 in parallel
6 feet of device LM324 are also grounded through resistance R5, and 7 feet of third amplifier LM324 are as output end, and side is connected to filter capacitor C3；
Alarm unit, to NO in tail gas2The exceeded situation of content is alarmed；
Display unit, to show NO in tail gas2Content；
Microprocessor, to the NO that will test2Content is compared with setting value, and control alarm unit hair is issued if exceeded
Alarm signal out, while by NO2Content data information is sent to display unit to show；
The NO2Detection circuit, alarm unit and display unit are electrically connected on microprocessor.
2. a kind of vehicle exhaust emission of nitrogen oxide detection system according to claim 1, which is characterized in that the display
Unit is LCD display screen, and LCD display screen selects LR043JC211 liquid crystal display.
3. a kind of vehicle exhaust emission of nitrogen oxide detection system according to claim 1, which is characterized in that the alarm
Unit includes audible alarm unit and flashing light alarm unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820492457.2U CN208860788U (en) | 2018-04-09 | 2018-04-09 | A kind of vehicle exhaust emission of nitrogen oxide detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820492457.2U CN208860788U (en) | 2018-04-09 | 2018-04-09 | A kind of vehicle exhaust emission of nitrogen oxide detection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208860788U true CN208860788U (en) | 2019-05-14 |
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ID=66410466
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820492457.2U Active CN208860788U (en) | 2018-04-09 | 2018-04-09 | A kind of vehicle exhaust emission of nitrogen oxide detection system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208860788U (en) |
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2018
- 2018-04-09 CN CN201820492457.2U patent/CN208860788U/en active Active
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