CN112730308B - Device and method for testing tail gas components of whole vehicle - Google Patents
Device and method for testing tail gas components of whole vehicle Download PDFInfo
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- CN112730308B CN112730308B CN202110001362.2A CN202110001362A CN112730308B CN 112730308 B CN112730308 B CN 112730308B CN 202110001362 A CN202110001362 A CN 202110001362A CN 112730308 B CN112730308 B CN 112730308B
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Abstract
A device for testing the tail gas components of a whole vehicle comprises a sampling probe, a sampling pipeline and an infrared gas analyzer, wherein one end of the sampling pipeline is communicated with the sampling probe, the other end of the sampling pipeline is communicated with the infrared gas analyzer sequentially through a needle valve and a flowmeter, the gas analyzer is in signal connection with a data acquisition and storage system, a system pressure gauge is further arranged between the flowmeter and the infrared gas analyzer, and a pressure regulating valve is arranged at a gas outlet end of the system pressure gauge; the method for testing the tail gas components of the whole vehicle measures the collected gas by using the infrared gas analyzer after setting a proper sampling point and adjusting the pressure and flow conditions in the sampling pipeline, eliminates the delay of measurement time caused by the gas flowing through the sampling pipeline through the correction of response time, and is accurate in measurement. The design measuring device is simple in structure, gas collected by the sampling probe can truly reflect the tail gas emission level of the whole vehicle, the measuring result is accurate, and the gas can be tested under different backpressure conditions of the exhaust pipe of the whole vehicle.
Description
Technical Field
The invention relates to a testing device and a testing method, in particular to a testing device and a testing method for components of tail gas of a whole automobile, which are particularly suitable for analyzing and detecting components of unconventional quantity of the tail gas of the automobile.
Background
The existing exhaust emission detection method is implemented based on the requirement of mandatory gas types specified in global emission regulations, but in actual vehicle exhaust emission, some other unconventional gas components exist besides the mandatory gas types specified in the known global emission regulations, and the gas components directly causing sensory stimulation exist.
Based on the existing problems, a testing device and a testing method for applying an infrared Fourier transform detection technology to finished automobile exhaust component detection are developed, and the problem that unconventional components in finished automobile exhaust cannot be qualitatively and quantitatively detected at present is solved.
Disclosure of Invention
The invention aims to solve the problem that the unconventional gas components in the finished automobile exhaust cannot be qualitatively and quantitatively detected in the prior art, and provides a detection device and a detection method for analyzing and detecting the unconventional gas components in the automobile exhaust.
In order to achieve the above purpose, the technical solution of the invention is as follows:
the finished automobile tail gas component testing device comprises a sampling probe, a sampling pipeline and an infrared gas analyzer, wherein the sampling pipeline is a sealed pipeline, the sampling probe is communicated with one end of the sampling pipeline, the other end of the sampling pipeline is communicated with the infrared gas analyzer sequentially through a needle valve and a flowmeter, and a system pressure gauge is further arranged between the flowmeter and the infrared gas analyzer;
the finished automobile tail gas component testing device also comprises a pressure regulating valve, the pressure regulating valve is in sealing fit with the air outlet end of the finished automobile exhaust pipe, and a regulating valve pressure gauge is arranged on the pressure regulating valve;
the sampling probe is in sealing fit with the whole vehicle exhaust pipe and is positioned between the air inlet end of the whole vehicle exhaust pipe and the pressure regulating valve;
and the gas analyzer is in signal connection with the data acquisition and storage system.
The outer diameter of the sampling pipeline is 8 +/-0.2 mm, and the inner diameter of the sampling pipeline is 6 +/-0.2 mm.
The interior of the sampling pipeline is coated with a Teflon material coating.
And the sampling probe is provided with an air intake.
A finished automobile exhaust component testing method of a finished automobile exhaust component testing device comprises the following steps:
step one, setting sampling points: installing a pressure regulating valve at the air outlet end of a whole vehicle exhaust pipe, so that one end of the pressure regulating valve is communicated with the whole vehicle exhaust pipe, the other end of the pressure regulating valve is communicated with the atmosphere, selecting a sampling point on the whole vehicle exhaust pipe, punching a sampling hole at the sampling point, extending one end of a sampling probe into the whole vehicle exhaust pipe from the sampling hole, enabling an air intake port on the sampling probe to be positioned inside the whole vehicle exhaust pipe, and hermetically connecting the sampling probe with the sampling hole;
step two, the infrared gas analyzer is started and set to be in a sampling state, after the infrared gas analyzer receives a sampling command, a gas pump in the infrared gas analyzer is started, and the gas pump continuously pumps gas from a sampling pipeline to start sampling;
step three, regulating the back pressure of the exhaust pipe of the whole vehicle, and regulating the internal pressure and flow of the sampling pipeline: after the infrared gas analyzer starts sampling, observing a pressure value displayed by a pressure gauge of the pressure regulating valve, and adjusting the opening of the pressure regulating valve 4 to enable the pressure value displayed by the pressure gauge of the pressure regulating valve to be more than or equal to 5kpa;
adjusting a needle valve, and simultaneously observing display values of a flowmeter and a system pressure gauge until the flow value displayed by the flowmeter is not less than 10L/min, wherein the internal pressure of the sampling pipeline displayed by the system pressure gauge is between-25 kpa and-20 kpa;
step four, after the backpressure regulation of the exhaust pipe of the whole vehicle and the internal pressure and flow regulation of the sampling pipeline are finished, observing sampling flow parameters, bypass pressure parameters and system pressure state parameters displayed by the infrared gas analyzer, and returning to the step three if the parameters of the infrared gas analyzer are not in a normal working range, and readjusting the backpressure of the exhaust pipe of the whole vehicle, the internal pressure and the flow of the sampling pipeline;
if the parameters of the infrared gas analyzer are within the normal working range, recording a display numerical value A of the flowmeter and a display numerical value B of a system pressure gauge at the moment, and entering the next step;
step five, comparing the display value A of the flowmeter and the display value B of the system pressure gauge with the flow parameter and the pressure parameter displayed by the infrared gas analyzer respectively:
if the display numerical value A of the flowmeter and the display numerical value B of the system pressure gauge are inconsistent with the pressure parameter and the flow parameter displayed by the infrared gas analyzer, stopping detection and checking the tail gas detection device;
if the display numerical value A of the flowmeter and the display numerical value B of the system pressure gauge are consistent with the pressure parameter and the flow parameter displayed by the infrared gas analyzer, entering the next step;
step six, response time testing: adjusting an infrared gas analyzer to a 'measuring' station, starting a gas pump in the infrared gas analyzer, continuously extracting gas from a sampling pipeline by the infrared gas analyzer, testing the collected gas, and continuously sampling and measuring the infrared gas analyzer for 3 minutes, wherein the measured gas component is an atmospheric component and the concentration of each gas component is stable;
starting the whole automobile, recording the starting time of the whole automobile as T0, keeping the continuous sampling and measurement of the infrared gas analyzer until the measured value is stable, recording the stable time T90 of the measured value, wherein the time difference between the T0 time and the T90 time is the response time of the measurement, and then controlling the whole automobile to stop;
repeating the steps for at least three times to obtain an average value T of multiple response times;
seventhly, testing the tail gas of the whole vehicle and storing test data:
setting delay time as an average value T of multiple response times in the step six in a data acquisition and storage system;
enabling the infrared gas analyzer to keep a continuous sampling and measuring state, then starting the whole automobile, enabling the infrared gas analyzer to start sampling and measuring the whole automobile tail gas, simultaneously sending the detection time and the gas composition and concentration data detected at the corresponding time to the data acquisition and storage system by the infrared gas analyzer, recording the detection time and the gas composition and concentration data detected at the corresponding time by the data acquisition and storage system, and displaying the received gas composition and concentration data in real time;
after the test is finished, the whole automobile is controlled to stop;
the data acquisition and storage system subtracts the delay time T from the test time corresponding to each measurement according to the condition that the set delay time is T to obtain the actual discharge time corresponding to each measurement;
and the data acquisition and storage system (9) stores the gas component and concentration data obtained by each detection and the corresponding actual emission time to obtain the actual emission time and the corresponding finished automobile exhaust component and concentration data, and the test is finished at this moment.
In the first step, the inner diameter of the whole vehicle exhaust pipe is D, a sampling point is selected between the air inlet end of the whole vehicle exhaust pipe and the pressure regulating valve, and the distance between the sampling point and the air outlet end of the whole vehicle exhaust pipe is 3D-5D.
The value range of the inner diameter D of the whole vehicle exhaust pipe is 20-80mm.
The sampling measurement frequency of the infrared gas analyzer is 1HZ.
The measuring range of the flowmeter is 0-30L/min, and the precision is 1%.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the device for testing the components of the tail gas of the whole vehicle, the infrared gas analyzer can perform infrared spectrum analysis on the collected tail gas of the whole vehicle, detect some unconventional components contained in the tail gas of the whole vehicle, and monitor the concentration values of the unconventional components; the sampling probe and the pressure regulating valve are sequentially arranged on the whole vehicle exhaust pipe, the sampling probe is in sealing fit with a sampling hole formed in the whole vehicle exhaust pipe, the distance between the sampling hole and the air outlet end of the whole vehicle exhaust pipe is 3D-5D (D is the inner diameter of the whole vehicle exhaust pipe), the air outlet end of the whole vehicle exhaust pipe is provided with the pressure regulating valve in sealing fit with the air outlet end, the real-time pressure value in the whole vehicle exhaust pipe can be monitored through the pressure regulating valve, the setting of the pressure regulating valve is combined with the setting of the position of the sampling hole, the gas collected by the sampling probe can be ensured to be from the upstream of the sampling point, the real reflection of the whole vehicle exhaust emission level of the gas can be realized, the influence of external air is avoided, and the measurement is more accurate. Therefore, the infrared gas analyzer in the design can detect some unconventional components contained in the tail gas of the whole vehicle; the pressure regulating valve is arranged and the position of the sampling hole is arranged, so that the gas collected by the sampling probe can be ensured to come from the upstream of the sampling point, the collected gas can truly reflect the tail gas emission level of the whole vehicle, the influence of external air is avoided, and the measurement is more accurate.
2. According to the device for testing the components of the tail gas of the whole vehicle, the pressure regulating valve is in sealing fit with the gas outlet end of the exhaust pipe of the whole vehicle, the pressure gauge of the regulating valve detects the pressure in the exhaust pipe of the whole vehicle, the back pressure of the exhaust pipe of the whole vehicle can be regulated by the pressure regulating valve, and the test can be carried out under different back pressure conditions. Therefore, the pressure regulating valve in the design can regulate the back pressure of the exhaust pipe of the whole vehicle and can test under different back pressure conditions.
3. A needle valve and a flowmeter are sequentially arranged on a tail gas testing pipeline in the device for testing the components of the tail gas of the whole vehicle, a system pressure gauge is also arranged between the flowmeter and an infrared gas analyzer, the needle valve can continuously and finely adjust the gas flow by changing the gas flow area in a detection pipeline, the flowmeter monitors the flow in a sampling pipeline in real time, and the flow parameters are ensured to always meet the sampling conditions of the infrared gas analyzer; the system pressure gauge monitors the pressure in the sampling pipeline, and ensures that the internal pressure of the infrared gas analyzer is always in a normal range, so that the measurement is more accurate. Therefore, a needle valve and a flowmeter are sequentially arranged on the tail gas testing pipeline in the design, a system pressure gauge is further arranged between the flowmeter and the infrared gas analyzer, flow parameters and pressure parameters are guaranteed to meet sampling conditions of the infrared gas analyzer all the time, and the measurement is more accurate.
4. According to the method for detecting the tail gas components of the whole vehicle, multiple response time tests are set, the time correction is carried out on the test result according to the measured response time, the time difference between the measurement time and the actual emission time caused by the fact that gas flows through the sampling pipeline and reaches the infrared gas analyzer is eliminated, the real-time emission condition of the tail gas of the whole vehicle can be truly reflected by the measurement result, the measurement result is more accurate, and reliable data are provided for engine development and verification. Therefore, multiple response time tests are set in the design, and the time correction is carried out on the test results, so that the real-time emission condition of the tail gas of the whole vehicle can be truly reflected by the test results, the test results are more accurate, and reliable data are provided for engine development and verification.
Drawings
FIG. 1 is a schematic structural diagram of a device for testing vehicle exhaust components according to the present invention.
FIG. 2 is a schematic view of a connection structure of a sampling probe and an exhaust pipe of a whole vehicle.
In the figure: the device comprises a sampling probe 1, an air intake 11, a sampling pipeline 2, an infrared gas analyzer 3, a pressure regulating valve 4, a regulating valve pressure gauge 41, a needle valve 5, a flowmeter 6, a system pressure gauge 7, a whole vehicle exhaust pipe 8 and a data acquisition and storage system 9.
Detailed Description
The invention is described in further detail below with reference to the figures and the detailed description of the invention.
Referring to fig. 1 to 2, the device for testing the tail gas components of the whole vehicle comprises a sampling probe 1, a sampling pipeline 2 and an infrared gas analyzer 3, wherein the sampling pipeline 2 is a sealed pipeline, the sampling probe 1 is communicated with one end of the sampling pipeline 2, the other end of the sampling pipeline 2 is communicated with the infrared gas analyzer 3 sequentially through a needle valve 5 and a flowmeter 6, and a system pressure gauge 7 is further arranged between the flowmeter 6 and the infrared gas analyzer 3;
the finished automobile tail gas component testing device also comprises a pressure regulating valve 4, the pressure regulating valve 4 is in sealing fit with the air outlet end of a finished automobile exhaust pipe 8, and a regulating valve pressure gauge 41 is arranged on the pressure regulating valve 4;
the sampling probe 1 is in sealing fit with the whole vehicle exhaust pipe 8, and the sampling probe 1 is positioned between the air inlet end of the whole vehicle exhaust pipe 8 and the pressure regulating valve 4;
the gas analyzer 3 is in signal connection with a data acquisition and storage system 9.
The outer diameter of the sampling pipeline 2 is 8 +/-0.2 mm, and the inner diameter of the sampling pipeline 2 is 6 +/-0.2 mm.
The interior of the sampling pipe 2 is coated with a teflon material coating.
And the sampling probe 1 is provided with an air intake port 11.
A finished automobile exhaust component testing method of a finished automobile exhaust component testing device comprises the following steps:
step one, setting sampling points: installing a pressure regulating valve 4 at the air outlet end of a finished automobile exhaust pipe 8, enabling one end of the pressure regulating valve 4 to be communicated with the finished automobile exhaust pipe 8, enabling the other end of the pressure regulating valve 4 to be communicated with the atmosphere, selecting a sampling point on the finished automobile exhaust pipe 8, punching a sampling hole at the sampling point, extending one end of a sampling probe 1 into the finished automobile exhaust pipe 8 from the sampling hole, enabling an air inlet on the sampling probe 1 to be located inside the finished automobile exhaust pipe 8, and enabling the sampling probe 1 to be connected with the sampling hole in a sealing mode;
step two, the infrared gas analyzer 3 is started and set to be in a sampling state, after the infrared gas analyzer 3 receives a sampling command, an air pump in the infrared gas analyzer 3 is started, and the air pump continuously pumps air from the sampling pipeline 2 to start sampling;
step three, regulating the back pressure of the exhaust pipe 8 of the whole vehicle and regulating the internal pressure and flow of the sampling pipeline 2: after the infrared gas analyzer 3 starts sampling, observing the pressure value displayed by the pressure gauge 41 of the pressure regulating valve, and adjusting the opening of the pressure regulating valve 4 to enable the pressure value displayed by the pressure gauge 41 of the pressure regulating valve to be more than or equal to 5kpa;
adjusting the needle valve 5, and simultaneously observing display values of the flowmeter 6 and the system pressure gauge 7 until the flow value displayed by the flowmeter 6 is not less than 10L/min, wherein the internal pressure of the sampling pipeline 2 displayed by the system pressure gauge 7 is between-25 kpa and-20 kpa;
step four, after the back pressure adjustment of the exhaust pipe 8 of the whole vehicle and the internal pressure and flow adjustment of the sampling pipeline 2 are finished, observing a sampling flow parameter, a bypass pressure parameter and a system pressure state parameter displayed by the infrared gas analyzer 3, and if the parameter of the infrared gas analyzer 3 is not in a normal working range, returning to the step three, and readjusting the back pressure of the exhaust pipe 8 of the whole vehicle and the internal pressure and flow of the sampling pipeline 2;
if the parameters of the infrared gas analyzer 3 are in the normal working range, recording a display numerical value A of the flowmeter 6 and a display numerical value B of the system pressure gauge 7 at the moment, and entering the next step;
step five, comparing the display value A of the flowmeter 6 and the display value B of the system pressure gauge 7 with the flow parameter and the pressure parameter displayed by the infrared gas analyzer 3 respectively:
if the display numerical value A of the flowmeter 6 and the display numerical value B of the system pressure gauge 7 are inconsistent with the pressure parameter and the flow parameter displayed by the infrared gas analyzer 3, stopping detection and checking the tail gas detection device;
if the display numerical value A of the flowmeter 6 and the display numerical value B of the system pressure gauge 7 are consistent with the pressure parameter and the flow parameter displayed by the infrared gas analyzer 3, entering the next step;
step six, response time testing: adjusting an infrared gas analyzer 3 to a 'measuring' station, starting a gas pump in the infrared gas analyzer 3, continuously pumping gas from a sampling pipeline 2 by the infrared gas analyzer 3, testing the collected gas, continuously sampling and measuring the infrared gas analyzer 3 for 3 minutes, wherein the measured gas component is an atmospheric component and the concentration of each gas component is stable;
starting the whole automobile, recording the starting time of the whole automobile as T0, keeping the infrared gas analyzer 3 to continuously sample and measure until the measured value is stable, recording the measured value stabilizing time T90, wherein the time difference between the T0 time and the T90 time is the response time of the measurement, and then controlling the whole automobile to stop;
repeating the steps for at least three times to obtain an average value T of multiple response times;
seventhly, testing the tail gas of the whole vehicle and storing test data:
setting the delay time as an average value T of the multiple response times in the step six in the data acquisition and storage system 9;
the method comprises the following steps that the infrared gas analyzer 3 keeps a continuous sampling and measuring state, then the whole automobile is started, the infrared gas analyzer 3 starts to sample and measure the whole tail gas, meanwhile, the infrared gas analyzer 3 sends gas components and concentration data detected at detection time and corresponding time to the data acquisition and storage system 9, the data acquisition and storage system 9 records the gas components and concentration data detected at the detection time and corresponding time, and displays the received gas components and concentration data in real time;
after the test is finished, the whole automobile is controlled to stop;
the data acquisition and storage system (9) subtracts the delay time T from the recorded detection time corresponding to each measurement according to the condition that the set delay time is T to obtain the actual discharge time corresponding to each measurement;
and the data acquisition and storage system (9) stores the gas component and concentration data obtained by each detection and the corresponding actual emission time to obtain the actual emission time and the corresponding data of the vehicle tail gas component and concentration, and the test is finished at the moment.
In the step one, the inner diameter of the whole vehicle exhaust pipe 8 is D, a sampling point is selected between the air inlet end of the whole vehicle exhaust pipe 8 and the pressure regulating valve 4, and the distance between the sampling point and the air outlet end of the whole vehicle exhaust pipe 8 is 3D-5D.
The inner diameter D of the whole vehicle exhaust pipe 8 ranges from 20 mm to 80mm.
The sampling measurement frequency of the infrared gas analyzer 3 is 1HZ.
The measuring range of the flowmeter 6 is 0-30L/min, and the precision is 1%.
The principle of the invention is illustrated as follows:
the pressure regulating valve 4 can regulate the back pressure of the whole vehicle exhaust pipe 8, and the test of different back pressure conditions is met.
The flowmeter 6 ensures that the sampling flow is consistent with the sampling flow of the infrared gas analyzer by monitoring the sampling flow; the system pressure gauge 7 monitors the sampling pressure in the sampling pipeline 2, and ensures that the internal pressure of the infrared gas analyzer 3 communicated with the sampling pipeline 2 is within a normal range.
The inner wall of the sampling pipeline 2 is coated with a Teflon material coating, so that the low adsorbability and high temperature resistance of the inner wall of the pipeline can be ensured.
Because the sampling pipeline 2 has a certain length, a certain time is needed for the tail gas of the whole vehicle to reach the infrared gas analyzer through the sampling pipeline 2 after being exhausted from the whole vehicle exhaust pipe 8, so that a time difference exists between the exhaust time and the measurement, in the response time test, the whole vehicle exhaust pipe 8 starts to exhaust when the starting time of the whole vehicle is T0, and the gas tested in the infrared gas analyzer 3 is the air in the sampling pipeline 2; after the tail gas of the whole automobile reaches the infrared gas analyzer 3 through the sampling pipeline 2, the infrared gas analyzer 3 stably measures the tail gas components of the whole automobile, the measured value stabilization time of the infrared gas analyzer 3 is T90, and the time difference between the measured value stabilization time T90 and the starting time T0 of the whole automobile is the time when the gas flows through the sampling pipeline 2, namely the response time.
The infrared gas analyzer 3 performs infrared spectroscopic analysis on the collected whole vehicle tail gas, outputs gas components and concentration values contained in the tail gas, and transmits the gas components and concentration values contained in the tail gas to the data acquisition and storage system 9.
Example 1:
a testing device for tail gas components of a whole vehicle comprises a sampling probe 1, a sampling pipeline 2 and an infrared gas analyzer 3, wherein the sampling pipeline 2 is a sealed pipeline, the sampling probe 1 is communicated with one end of the sampling pipeline 2, the other end of the sampling pipeline 2 is communicated with the infrared gas analyzer 3 sequentially through a needle valve 5 and a flowmeter 6, and a system pressure gauge 7 is further arranged between the flowmeter 6 and the infrared gas analyzer 3; the finished automobile tail gas component testing device also comprises a pressure regulating valve 4, the pressure regulating valve 4 is in sealing fit with the gas outlet end of an finished automobile exhaust pipe 8, and a regulating valve pressure gauge 41 is arranged on the pressure regulating valve 4; the sampling probe 1 is in sealing fit with the whole vehicle exhaust pipe 8, and the sampling probe 1 is positioned between the air inlet end of the whole vehicle exhaust pipe 8 and the pressure regulating valve 4; the gas analyzer 3 is in signal connection with a data acquisition and storage system 9;
a finished automobile exhaust component testing method of a finished automobile exhaust component testing device comprises the following steps:
step one, setting sampling points: installing a pressure regulating valve 4 at the air outlet end of a finished automobile exhaust pipe 8, enabling one end of the pressure regulating valve 4 to be communicated with the finished automobile exhaust pipe 8, enabling the other end of the pressure regulating valve 4 to be communicated with the atmosphere, selecting a sampling point on the finished automobile exhaust pipe 8, punching a sampling hole at the sampling point, extending one end of a sampling probe 1 into the finished automobile exhaust pipe 8 from the sampling hole, enabling an air inlet on the sampling probe 1 to be located inside the finished automobile exhaust pipe 8, and enabling the sampling probe 1 to be in sealing connection with the sampling hole;
step two, the infrared gas analyzer 3 is started and set to be in a sampling state, after the infrared gas analyzer 3 receives a sampling command, an air pump in the infrared gas analyzer 3 is started, and the air pump continuously pumps air from the sampling pipeline 2 to start sampling;
step three, regulating the back pressure of the exhaust pipe 8 of the whole vehicle, and regulating the internal pressure and flow of the sampling pipeline 2: after the infrared gas analyzer 3 starts sampling, observing the pressure value displayed by the pressure gauge 41 of the pressure regulating valve, and adjusting the opening of the pressure regulating valve 4 to enable the pressure value displayed by the pressure gauge 41 of the pressure regulating valve to be more than or equal to 5kpa;
adjusting the needle valve 5, and simultaneously observing display values of the flowmeter 6 and the system pressure gauge 7 until the flow value displayed by the flowmeter 6 is not less than 10L/min, wherein the internal pressure of the sampling pipeline 2 displayed by the system pressure gauge 7 is between-20 kpa and-25 kpa;
step four, after the back pressure adjustment of the exhaust pipe 8 of the whole vehicle and the internal pressure and flow adjustment of the sampling pipeline 2 are finished, observing a sampling flow parameter, a bypass pressure parameter and a system pressure state parameter displayed by the infrared gas analyzer 3, and if the parameter of the infrared gas analyzer 3 is not in a normal working range, returning to the step three, and readjusting the back pressure of the exhaust pipe 8 of the whole vehicle and the internal pressure and flow of the sampling pipeline 2;
if the parameters of the infrared gas analyzer 3 are in the normal working range, recording a display numerical value A of the flowmeter 6 and a display numerical value B of the system pressure gauge 7 at the moment, and entering the next step;
step five, comparing the display value A of the flowmeter 6 and the display value B of the system pressure gauge 7 with the flow parameter and the pressure parameter displayed by the infrared gas analyzer 3 respectively:
if the display numerical value A of the flowmeter 6 and the display numerical value B of the system pressure gauge 7 are inconsistent with the pressure parameter and the flow parameter displayed by the infrared gas analyzer 3, stopping detection and checking the tail gas detection device;
if the display numerical value A of the flowmeter 6 and the display numerical value B of the system pressure gauge 7 are consistent with the pressure parameter and the flow parameter displayed by the infrared gas analyzer 3, entering the next step;
step six, response time testing: adjusting an infrared gas analyzer 3 to a 'measuring' station, starting a gas pump in the infrared gas analyzer 3, continuously pumping gas from a sampling pipeline 2 by the infrared gas analyzer 3, testing the collected gas, continuously sampling and measuring the infrared gas analyzer 3 for 3 minutes, wherein the measured gas component is an atmospheric component and the concentration of each gas component is stable;
starting the whole automobile, recording the starting time of the whole automobile as T0, keeping the infrared gas analyzer 3 to continuously sample and measure until the measured value is stable, recording the measured value stabilizing time T90, wherein the time difference between the T0 time and the T90 time is the response time of the measurement, and then controlling the whole automobile to stop;
repeating the steps for three times to obtain an average value T of response time for three times;
seventhly, testing the tail gas of the whole vehicle and storing test data:
setting the delay time as an average value T of the multiple response times in the step six in the data acquisition and storage system 9;
the method comprises the following steps that the infrared gas analyzer 3 keeps a continuous sampling and measuring state, then the whole automobile is started, the infrared gas analyzer 3 starts to sample and measure the whole tail gas, meanwhile, the infrared gas analyzer 3 sends gas components and concentration data detected at detection time and corresponding time to the data acquisition and storage system 9, the data acquisition and storage system 9 records the gas components and concentration data detected at the detection time and corresponding time, and displays the received gas components and concentration data in real time;
after the test is finished, the whole automobile is controlled to stop;
the data acquisition and storage system (9) subtracts the delay time T from the recorded detection time corresponding to each measurement according to the condition that the set delay time is T to obtain the actual discharge time corresponding to each measurement;
and the data acquisition and storage system (9) stores the gas component and concentration data obtained by each detection and the corresponding actual emission time to obtain the actual emission time and the corresponding finished automobile exhaust component and concentration data, and the test is finished at this moment.
In the step one, the inner diameter of the whole vehicle exhaust pipe 8 is D, a sampling point is selected between the air inlet end of the whole vehicle exhaust pipe 8 and the pressure regulating valve 4, and the distance between the sampling point and the air outlet end of the whole vehicle exhaust pipe 8 is 3D-5D.
Example 2:
example 2 is substantially the same as example 1 except that:
the outer diameter of the sampling pipeline 2 is 8 +/-0.2 mm, and the inner diameter of the sampling pipeline 2 is 6 +/-0.2 mm; the interior of the sampling pipeline 2 is coated with a Teflon material coating; an air intake port 11 is arranged on the sampling probe 1; the sampling measurement frequency of the infrared gas analyzer 3 is 1HZ; the measuring range of the flowmeter 6 is 0-30L/min, and the precision is 1%.
Example 3:
example 3 is substantially the same as example 2 except that:
in the first step, the inner diameter of the whole vehicle exhaust pipe 8 is D, sampling points are selected between the air inlet end of the whole vehicle exhaust pipe 8 and the pressure regulating valve 4, and the distance between the sampling points and the air outlet end of the whole vehicle exhaust pipe 8 is 3D-5D; the inner diameter D of the whole vehicle exhaust pipe 8 ranges from 20 mm to 80mm.
Claims (8)
1. A method for testing components of tail gas of a finished automobile is characterized by comprising the following steps:
the testing method is based on a testing device for the tail gas components of the whole vehicle,
the finished automobile tail gas component testing device comprises a sampling probe (1), a sampling pipeline (2) and an infrared gas analyzer (3), wherein the sampling pipeline (2) is a sealed pipeline, the sampling probe (1) is communicated with one end of the sampling pipeline (2), the other end of the sampling pipeline (2) is communicated with the infrared gas analyzer (3) sequentially through a needle valve (5) and a flowmeter (6), and a system pressure gauge (7) is further arranged between the flowmeter (6) and the infrared gas analyzer (3);
the finished automobile tail gas component testing device also comprises a pressure regulating valve (4), the pressure regulating valve (4) is in sealing fit with the air outlet end of the finished automobile exhaust pipe (8), and a regulating valve pressure gauge (41) is arranged on the pressure regulating valve (4);
the sampling probe (1) is in sealing fit with the whole vehicle exhaust pipe (8), and the sampling probe (1) is positioned between the air inlet end of the whole vehicle exhaust pipe (8) and the pressure regulating valve (4);
the gas analyzer (3) is in signal connection with a data acquisition and storage system (9);
the test method comprises the following steps: step one, setting sampling points: the method comprises the following steps that a pressure regulating valve (4) is installed at the air outlet end of a whole vehicle exhaust pipe (8), one end of the pressure regulating valve (4) is communicated with the whole vehicle exhaust pipe (8), the other end of the pressure regulating valve (4) is communicated with the atmosphere, sampling points are selected on the whole vehicle exhaust pipe (8), sampling holes are punched at the sampling points, one end of a sampling probe (1) extends into the whole vehicle exhaust pipe (8) from the sampling holes, an air intake port on the sampling probe (1) is located inside the whole vehicle exhaust pipe (8), and the sampling probe (1) is connected with the sampling holes in a sealing mode;
step two, the infrared gas analyzer (3) is started and set to be in a sampling state, after the infrared gas analyzer (3) receives a sampling command, a gas pump in the infrared gas analyzer (3) is started, and the gas pump continuously pumps gas from the sampling pipeline (2) to start sampling;
step three, regulating the back pressure of the whole vehicle exhaust pipe (8) and regulating the internal pressure and flow of the sampling pipeline (2): after the infrared gas analyzer (3) starts sampling, observing the pressure value displayed by a pressure gauge (41) of the pressure regulating valve, and adjusting the opening of the pressure regulating valve (4) to enable the pressure value displayed by the pressure gauge (41) of the regulating valve to be more than or equal to 5kpa;
adjusting the needle valve (5), and simultaneously observing display values of the flowmeter (6) and a system pressure gauge (7) until the flow value displayed by the flowmeter (6) is not less than 10L/min, wherein the system pressure gauge (7) displays that the internal pressure of the sampling pipeline (2) is between-25 kpa and-20 kpa;
step four, observing sampling flow parameters, bypass pressure parameters and system pressure state parameters displayed by the infrared gas analyzer (3) after the backpressure regulation of the finished automobile exhaust pipe (8) and the internal pressure and flow regulation of the sampling pipeline (2) are finished, returning to the step three if the parameters of the infrared gas analyzer (3) are not in a normal working range, and readjusting the backpressure of the finished automobile exhaust pipe (8), the internal pressure and flow of the sampling pipeline (2);
if the parameters of the infrared gas analyzer (3) are within the normal working range, recording a display numerical value A of the flowmeter (6) and a display numerical value B of a system pressure gauge (7) at the moment, and entering the next step;
comparing the display value A of the flowmeter (6) and the display value B of the system pressure gauge (7) with the flow parameter and the pressure parameter displayed by the infrared gas analyzer (3) respectively:
if the display numerical value A of the flowmeter (6) and the display numerical value B of the system pressure gauge (7) are inconsistent with the pressure parameter and the flow parameter displayed by the infrared gas analyzer (3), stopping detection and checking the tail gas detection device;
if the display numerical value A of the flowmeter (6) and the display numerical value B of the system pressure gauge (7) are consistent with the pressure parameter and the flow parameter displayed by the infrared gas analyzer (3), entering the next step;
step six, response time testing: adjusting an infrared gas analyzer (3) to a 'measuring' station, starting a gas pump in the infrared gas analyzer (3), continuously extracting gas from a sampling pipeline (2) by the infrared gas analyzer (3), testing the collected gas, continuously sampling and measuring the infrared gas analyzer (3) for 3 minutes, wherein the measured gas components are atmospheric components, and the concentrations of the gas components are stable;
starting the whole automobile, recording the starting time of the whole automobile as T0, keeping the continuous sampling and measurement of the infrared gas analyzer (3) until the measured value is stable, recording the stable measured value time T90, wherein the time difference between the T0 time and the T90 time is the response time of the measurement, and then controlling the whole automobile to stop;
repeating the steps for at least three times to obtain an average value T of multiple response times;
seventhly, testing the tail gas of the whole vehicle and storing test data:
setting delay time as an average value T of multiple response times in the step six in a data acquisition and storage system (9);
the method comprises the following steps that an infrared gas analyzer (3) keeps a continuous sampling and measuring state, then the whole automobile of the automobile is started, the infrared gas analyzer (3) starts to sample and measure the tail gas of the whole automobile, meanwhile, the infrared gas analyzer (3) sends gas composition and concentration data obtained by each detection and corresponding detection time to a data acquisition and storage system (9), the data acquisition and storage system (9) records the gas composition and concentration data obtained by each detection and corresponding detection time, and displays the received gas composition and concentration data in real time;
after the test is finished, the whole automobile is controlled to stop;
the data acquisition and storage system (9) subtracts the delay time T from the recorded detection time corresponding to each measurement according to the condition that the set delay time is T to obtain the actual discharge time corresponding to each measurement;
and the data acquisition and storage system (9) stores the gas component and concentration data obtained by each detection and the corresponding actual emission time to obtain the actual emission time and the corresponding data of the vehicle tail gas component and concentration, and the test is finished at the moment.
2. The finished automobile exhaust component testing method according to claim 1, characterized in that:
the outer diameter of the sampling pipeline (2) is 8 +/-0.2 mm, and the inner diameter of the sampling pipeline (2) is 6 +/-0.2 mm.
3. The finished automobile exhaust component testing method according to claim 2, characterized in that:
the interior of the sampling pipeline (2) is coated with a Teflon material coating.
4. The method for testing the components of the tail gas of the whole vehicle according to claim 3, characterized in that:
and an air taking port (11) is arranged on the sampling probe (1).
5. The finished automobile exhaust component testing method according to claim 4, characterized in that:
in the step one, the inner diameter of the finished automobile exhaust pipe (8) is D, a sampling point is selected between the air inlet end of the finished automobile exhaust pipe (8) and the pressure regulating valve (4), and the distance between the sampling point and the air outlet end of the finished automobile exhaust pipe (8) is 3D-5D.
6. The finished automobile exhaust component testing method according to claim 5, characterized in that:
the value range of the inner diameter D of the vehicle exhaust pipe (8) is 20-80mm.
7. The finished automobile exhaust component testing method according to claim 6, characterized in that:
the sampling measurement frequency of the infrared gas analyzer (3) is 1HZ.
8. The vehicle exhaust component testing method according to claim 7, characterized in that:
the measuring range of the flowmeter (6) is 0-30L/min, and the precision is 1%.
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| US20100314089A1 (en) * | 2006-04-14 | 2010-12-16 | Lincoln Evans-Beauchamp | Reduced Backpressure Combustion Purifier |
| CN201000394Y (en) * | 2007-01-12 | 2008-01-02 | 武汉四方光电科技有限公司 | Device for measuring gross amount of pollutant discharging of motor vehicle |
| CN101000278A (en) * | 2007-01-12 | 2007-07-18 | 武汉四方光电科技有限公司 | Method and device for measuring pollutant discharging total of motor vehicle |
| CN101113947B (en) * | 2007-06-01 | 2010-09-29 | 中国汽车技术研究中心 | Devices and methods for measuring granular material discharged by vehicle |
| CN101949843B (en) * | 2010-09-02 | 2012-09-05 | 武汉市天虹仪表有限责任公司 | Gas circuit system for measuring automotive tail gas in real time |
| CN102196559B (en) * | 2011-05-04 | 2013-12-25 | 西安电子科技大学 | Method for eliminating channel delay errors based on TDOA (time difference of arrival) positioning |
| CN107662695B (en) * | 2016-07-27 | 2022-04-01 | 中国人民解放军海军大连舰艇学院 | Other-hidden and self-hidden utilization method for ship main engine tail gas |
| CN205910038U (en) * | 2016-08-15 | 2017-01-25 | 厦门中泓检测技术股份有限公司 | Smoke discharging monitoring system |
| CN106124712A (en) * | 2016-08-31 | 2016-11-16 | 青岛欧森系统技术有限公司 | A kind of boats and ships fume continuous monitoring system |
| CN108104925A (en) * | 2016-11-25 | 2018-06-01 | 贵州北斗环科工程有限公司 | Exhaust gas from diesel vehicle discharge on-line monitoring, diagnosis and the method repaired |
| CN107782639A (en) * | 2017-10-27 | 2018-03-09 | 广西玉柴机器股份有限公司 | The back pressure test device of catalyst unit |
| CN108956876B (en) * | 2018-07-12 | 2020-12-29 | 浙江大学 | Measurement delay correction method for smoke on-line continuous monitoring system |
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