Motor vehicle exhaust telemetry system and control method and control device thereof

Abstract

The present invention relates to the field of exhaust gas detection technology, and specifically to a motor vehicle exhaust gas telemetry system and a control method and a control device thereof. A control method for a motor vehicle exhaust gas telemetry system includes: obtaining a first measurement curve of a target gas passing through a first optical path; obtaining the target gas concentration in a standard gas pool; calibrating the standard curve according to a second optical path; and calculating the concentration of the target gas in the motor vehicle exhaust gas according to the calibrated standard curve, the target gas concentration in the standard gas pool, and the first measurement curve. The standard curve is calibrated in real time according to the second optical path, and the concentration of the target gas in the motor vehicle exhaust gas is calculated according to the calibrated standard curve, the target gas concentration in the standard gas pool, and the first measurement curve, so that the calculation of the concentration of the target gas in the motor vehicle exhaust gas is based on the calibrated standard curve, which has high timeliness, and also makes the calculation of the concentration of the target gas in the motor vehicle exhaust gas more accurate, thereby preventing misjudgment of violations of motor vehicle exhaust gas emissions.

Description

Technical Field

[0001] The present invention relates to the technical field of exhaust gas detection, and in particular to a motor vehicle exhaust gas telemetry system and a control method and a control device thereof. Background Art

[0002] With the rapid growth of social economy and urban population, the number of motor vehicles in my country has increased rapidly. While the rapid growth of motor vehicles has brought convenience to people's travel, it has also brought serious traffic congestion and environmental pollution problems. Motor vehicle exhaust pollution has become one of the main factors of urban pollution, an important monitoring content of urban management and environmental governance, and an important part of atmospheric environment monitoring.

[0003] Remote sensing monitoring technology for motor vehicle exhaust is a relatively mature online monitoring technology for motor vehicles. It detects exhaust in real time from normally running motor vehicles in a non-contact manner. After long-term use, the remote sensing measurement system for motor vehicle exhaust on the market needs special operation and maintenance personnel to manually calibrate the built-in curve of the system as the measurement environment changes. The timeliness is low and it is difficult to ensure the accuracy of the measurement data. In addition, since personnel need to calibrate on both sides of the motor vehicle lane, the danger of calibration is increased.

[0004] The prior art also discloses a device and method for remote calibration of a remote sensing monitoring system for exhaust gas of a motor vehicle. The remote sensing monitoring system does not require personnel to be on-site for calibration. Instead, remote control is adopted by personnel to issue control instructions to achieve remote calibration. However, manual operation is still required, which increases labor costs. After one calibration, the calibrated built-in standard curve and the system background spectrum curve are determined as measurement references, and long-term measurements are performed until the next calibration. Since the on-site environment and influencing factors of each measurement have changed relative to the time of calibration, the use of the old calibrated built-in standard curve and the system background spectrum curve as measurement references will inevitably introduce additional measurement errors, resulting in low timeliness and insufficient accuracy of measurement data. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defects of low timeliness and insufficient accuracy of measurement data of the motor vehicle exhaust remote sensing monitoring system in the prior art, thereby providing a motor vehicle exhaust telemetry system that can be automatically calibrated, has high timeliness and high accuracy of measurement data, and a control method and control device thereof.

[0006] A first aspect of the present invention provides a control method for a motor vehicle exhaust remote sensing system, wherein the motor vehicle exhaust remote sensing system comprises a first optical path and a second optical path, wherein a calibration gas pool is provided in the second optical path, and the control method comprises:

[0007] Acquire a first measurement curve of target gas passing through the first optical path;

[0008] Obtaining the target gas concentration in the standard gas pool;

[0009] Calibrate a standard curve according to the second optical path, wherein the standard curve is a standard curve of a concentration parameter of a target gas in a standard gas pool;

[0010] The concentration of the target gas in the exhaust gas of the motor vehicle is calculated according to the calibrated standard curve, the concentration of the target gas in the standard gas pool and the first measurement curve.

[0011] Optionally, the concentration N of the target gas in the motor vehicle exhaust is 测 It can be calculated by the following formula:

[0012] N 测 =N 标 *C1 / C 标

[0013] Wherein, C1 is the first measurement curve of the target gas passing through the first optical path; N 标 is the target gas concentration of the target gas in the standard gas cell; C 标 is the standard curve; C1 / C 标 Refers to C1 and C 标 The ratios of the maximum amplitudes of the corresponding curves.

[0014] Optionally, obtaining a first measurement curve of the target gas passing through the first light path includes:

[0015] Obtaining a background spectrum curve V0 of the target gas in the motor vehicle exhaust telemetry system;

[0016] Obtaining a direct measurement curve V1 of the target gas passing through the first optical path;

[0017] A first measurement curve C1=V1-V0 of the first optical path is calculated, wherein C1 is a real-time curve obtained by deducting the values ​​of each time period corresponding to the background spectrum curve from the real-time values ​​of V1 in each time period actually measured.

[0018] Optionally, the “calibrating the standard curve according to the second optical path” includes:

[0019] Acquire a second measurement curve C2 of the target gas passing through the second optical path;

[0020] Calculate the concentration of the target gas in the calibration gas pool: N 标 ’ =N 标 *C2 / C 标 , where C2 / C 标 Refers to C2 and C 标The ratios of the maximum amplitudes of the corresponding curves;

[0021] Judge N 标 ’ With N 标 Whether the error is greater than or equal to the preset value;

[0022] If the N 标 ’ With N 标 If the error is greater than or equal to the preset value, the standard curve C 标 ’ =C2-C1, where C 标 ’ The curve is obtained by deducting the calculated real-time value of C1 from the actually measured real-time value of C2.

[0023] Optionally, the preset value is 5%.

[0024] Optionally, the “obtaining a second measurement curve C2 of the target gas passing through the second optical path” includes:

[0025] Get the background spectrum curve V0 of the target gas ’ =V1;

[0026] Obtaining a direct measurement curve V2 of the target gas passing through the second optical path;

[0027] A second measurement curve C2 = V2 - V1 of the second optical path is calculated, wherein C2 is a real-time curve obtained by deducting the values ​​of each time period corresponding to the background spectrum curve from the real-time values ​​of V2 in each time period actually measured.

[0028] A second aspect of the present invention provides a control device for a motor vehicle exhaust remote sensing system, wherein the motor vehicle exhaust remote sensing system comprises a first optical path and a second optical path, wherein a calibration gas pool is provided in the second optical path, and the control device comprises:

[0029] A first processing unit, used for obtaining a first measurement curve of the target gas passing through the first optical path;

[0030] A second processing unit, used for obtaining a target gas concentration of the target gas in the standard gas pool;

[0031] The control unit is used to calibrate the standard curve according to the second optical path, wherein the standard curve is a standard curve of the concentration parameters of the target gas in the standard gas pool; and calculate the concentration of the target gas in the motor vehicle exhaust according to the calibrated standard curve, the target gas concentration in the standard gas pool and the first measurement curve.

[0032] A third aspect of the present invention provides a motor vehicle exhaust remote sensing system, comprising:

[0033] A laser emitting device, used for emitting a modulated infrared laser spectrum;

[0034] A laser reflection device for returning the spectrum of the absorbed motor vehicle exhaust gas to the telemetry host;

[0035] An optical path beam splitting device, used for dividing the spectrum returned to the telemetry host into two paths, one of which leads to the first photoelectric detection device, and the other leads to the second photoelectric detection device after passing through the standard gas pool;

[0036] A signal processor is connected to the first photoelectric detection device and the second photoelectric detection device, and calculates the concentration information of the gas in the exhaust gas of the motor vehicle according to the spectrum after passing through the first photoelectric detection device and the second photoelectric detection device. The signal processor includes a memory and a processor, and the memory and the processor are communicatively connected to each other. Computer instructions are stored in the memory, and the processor executes the computer instructions to implement the control method of the above-mentioned motor vehicle exhaust telemetry system.

[0037] Optionally, the laser emitting device, the optical path beam splitting device, and the signal processor are arranged in the telemetry main unit, and the laser reflecting device is arranged in the telemetry sub-unit.

[0038] A fourth aspect of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute the above-mentioned control method of the motor vehicle exhaust telemetry system.

[0039] The technical solution of the present invention has the following advantages:

[0040] 1. The control method of the motor vehicle exhaust telemetry system provided by the present invention, by setting the motor vehicle exhaust telemetry system to include a first optical path and a second optical path provided with a standard gas pool, obtains in real time a first measurement curve of the target gas passing through the first optical path and the target gas concentration in the standard gas pool, calibrates the standard curve in real time according to the second optical path, and calculates the concentration of the target gas in the motor vehicle exhaust according to the calibrated standard curve, the target gas concentration in the standard gas pool and the first measurement curve, so that the calculation of the concentration of the target gas in the motor vehicle exhaust is based on the calibrated standard curve, has high timeliness, and also makes the calculation of the concentration of the target gas in the motor vehicle exhaust more accurate, thereby preventing misjudgment of violations of motor vehicle exhaust emissions.

[0041] 2. The control method of the motor vehicle exhaust telemetry system provided by the present invention, when calibrating the standard curve, compares the calculated target gas concentration in the standard gas pool with the measured target gas concentration in the standard gas pool. If the error is greater than or equal to a preset value, the standard curve is replaced so that the concentration of the target gas in the motor vehicle exhaust to be measured next time can be calculated using the newly calibrated standard curve, so that the concentration of the target gas in the motor vehicle exhaust can be calculated more accurately.

[0042] 3. The motor vehicle exhaust telemetry system provided by the present invention arranges a laser emitting device, an optical path beam splitting device and a signal processor in a telemetry main unit, and a laser reflecting device in a telemetry auxiliary unit, so that the laser emitted from the telemetry main unit can be easily reflected back to the telemetry main unit by the reflecting device in the telemetry auxiliary unit, and the laser reflected back to the telemetry main unit can be received by the optical path beam splitting device in the telemetry main unit and processed by the signal processor in time. Such an arrangement also makes the overall structure of the system more compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0044] Figure 1 It is a structural schematic diagram of the motor vehicle exhaust telemetry system of the present invention;

[0045] Figure 2 A flow chart of a control method of a motor vehicle exhaust telemetry system according to the present invention;

[0046] Description of reference numerals:

[0047] 1-telemetry host; 2-telemetry auxiliary machine; 3-laser emitting device; 4-optical path beam splitting device; 5-first photoelectric detection device; 6-second photoelectric detection device; 7-phase-locked amplifier; 8-signal processor; 9-industrial computer; 10-trigger controller; 11-standard gas pool. DETAILED DESCRIPTION

[0048] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0050] like Figure 1 As shown, an embodiment of the present invention provides a motor vehicle exhaust telemetry system, which can be set up on the road to measure the exhaust gas of passing motor vehicles. The motor vehicle exhaust telemetry system includes a telemetry host 1 and a telemetry auxiliary machine 2 respectively arranged on both sides of the motor vehicle lane. The telemetry host 1 is used to emit a modulated infrared laser spectrum. The telemetry auxiliary machine 2 is provided with a laser reflection device inside, which returns the spectrum to the inside of the telemetry host 1, and is received by the optical path splitting device 4 inside the telemetry host 1. The returned spectrum is divided into two paths, the first optical path is directly sent to the signal processor 8, and the second optical path is sent to the signal processor 8 after passing through the standard gas pool 11. The signal processor 8 can calculate the concentration information of the gas based on the returned spectrum. When the laser spectrum emitted by the telemetry host 1 penetrates the exhaust plume of the passing motor vehicle, the laser spectrum with gas absorption information returns to the telemetry host 1. After being split by the optical path splitting device 4, it can pass through the photoelectric detector to generate an induction signal, and then the concentration information of the motor vehicle exhaust gas is obtained by the signal processor 8. The signal processor 8 includes a memory and a processor, and the memory and the processor are connected to each other in communication. The memory stores computer instructions, and the processor executes the computer instructions to execute. Figure 2 Schematic diagram of a control method for a motor vehicle exhaust telemetry system.

[0051] Figure 2 A flow chart illustrating a control method of a motor vehicle exhaust telemetry system, the control method comprising:

[0052] Step S101: Obtain a first measurement curve of the target gas passing through the first optical path. Specifically, the curve can be measured by a photodetector and a phase-locked amplifier. Since the more pollutants in motor vehicle exhaust are CO2, CO, HC and NO, the target gases in this embodiment are CO2, CO, HC and NO as examples. Of course, in other embodiments, the target gas can also be set to any one of CO, HC and NO, or a combination of any two, three or four of CO2, CO, HC and NO, or other pollutant gases in motor vehicle exhaust.

[0053] Since the target gas in the exhaust gas of a motor vehicle itself also exists in the atmosphere, the initial background spectrum curve V0 of the target gas can be obtained through the content of the target gas in the atmosphere, and it can be pre-stored in the motor vehicle exhaust telemetry system. Then, when the motor vehicle passes through the lane, by obtaining the direct measurement curve V1 of the target gas in its exhaust gas through the first optical path, the first measurement curve C1 of the first optical path can be calculated through "C1=V1-V0", wherein C1 is the real-time curve obtained by deducting the value of each time period corresponding to the background spectrum curve from the real-time value of each time period actually measured of V1.

[0054] Step S102: Acquire the concentration of the target gas in the standard gas pool. In this embodiment, the concentration of the target gas in the standard gas pool is detected by a gas analyzer. As a changeable implementation, the concentration of the target gas can also be measured in other ways.

[0055] Step S103: Calibrate the standard curve according to the second optical path, and the standard curve is the standard curve of the concentration parameter of the target gas in the standard gas pool. In the measurement of motor vehicle exhaust, due to the complex background noise and the short measurement time requirement, it is impossible to obtain a stable spectrum through long-term integration like in a laboratory, and then invert the concentration of the gas to be measured. According to the actual situation of motor vehicle exhaust measurement, it is necessary to accurately measure the exhaust concentration in a very short time and under complex background noise. Generally, the standard second harmonic spectrum of the gas with known concentration is used to perform least squares fitting on the second harmonic spectrum signal of the gas to be measured, and the concentration of the gas to be measured is inverted by the spectral ratio. The standard second harmonic spectrum of the gas with known concentration is the standard curve. By calibrating the standard curve corresponding to the target gas in the standard gas pool, the calculation of the target gas concentration in the motor vehicle exhaust is more accurate.

[0056] Step S104: Calculate the concentration of the target gas in the exhaust gas of the motor vehicle according to the calibrated standard curve, the concentration of the target gas in the standard gas pool and the first measurement curve. Specifically, the concentration N of the target gas in the exhaust gas of the motor vehicle in this embodiment is 测 It can be calculated by the following formula:

[0057] N 测 =N 标 *C1 / C 标

[0058] Wherein, C1 is the first measurement curve of the target gas passing through the first optical path; N 标 is the target gas concentration in the standard gas pool; C 标 is the standard curve, and “C1 / C 标 ” refers to C1 and C 标 The ratios of the maximum amplitudes of the corresponding curves.

[0059] In this embodiment, “Step S103: calibrating the standard curve according to the second optical path” specifically includes:

[0060] Step S1031: Obtain the second measurement curve C2 of the target gas according to the second optical path. Since the spectral gas of the second optical path needs to pass through the standard gas cell, when calibrating the standard curve of the target gas in the standard gas cell, it is necessary to first obtain the second measurement curve of the target gas according to the second optical path.

[0061] Similarly, when obtaining the second measurement curve of the target gas according to the second optical path, the background spectrum curve of the target gas at this time must also be obtained first. At this time, the background spectrum curve needs to be zero-calibrated. If it is used for the first time, the background spectrum curve of the target gas at this time is V0. If it is in the process of measuring motor vehicle exhaust, the background spectrum curve of the target gas at this time is V0. ’ That is, the direct measurement curve V1 of the target gas in the exhaust of the motor vehicle that has just been measured through the first optical path. By performing zero-point calibration on the background spectrum curve, the acquisition of the second measurement curve at this time is more accurate and has a higher timeliness. If the background spectrum curve is not zero-calibrated, and the background spectrum curve corresponding to the target gas in the initial atmosphere is used to obtain the second measurement curve, it will inevitably affect the accuracy of the measurement. Of course, in order to prevent the background spectrum curve from being replaced so frequently, it is also possible to compare the error value between V0 and V1. When the error value between the two is greater than or equal to 5%, the direct measurement curve V1 of the target gas through the first optical path is used as the background spectrum curve V0 of the target gas at this time. ’ If the error between the two is less than 5%, the background spectrum curve of the target gas will not be replaced. Then the direct measurement curve V2 of the target gas according to the second optical path is obtained, and the second measurement curve C2 of the second optical path can be calculated by "C2 = V2-V1", where C2 is the real-time curve obtained by deducting the value of each time period corresponding to the background spectrum curve from the real-time value of each time period actually measured for V2.

[0062] Step S1032: Calculate the concentration of the target gas in the calibration gas pool: N 标 ’ =N 标 *C2 / C 标 , where C2 / C 标 Refers to C2 and C 标 The ratio of the maximum amplitude of the corresponding curves. Through the second measurement curve C2, the target gas concentration N in the standard gas pool 标 , Standard curve C 标 The concentration of the target gas in the standard gas pool at this time is calculated. Since the background spectrum curve at this time has been calibrated to zero point, the calculated concentration of the target gas in the standard gas pool is relatively accurate.

[0063] Step S1033: Determine N 标 ’ With N 标 The error of is greater than or equal to the preset value. Specifically, the preset value in this embodiment is 5%. As a convertible implementation, the preset value can also be other values, such as 2%, 3%, etc. 标 ’ With N 标 If the error is greater than or equal to the preset value, execute step S1034; 标 ’ With N 标 If the error is less than the preset value, the standard curve will not be replaced.

[0064] Step S1034: Standard curve C 标 ’ =C2-C1, where C 标 ’ The curve is obtained by deducting the calculated real-time value of C1 from the actual measured real-time value of C2. By calibrating the standard curve, the calculated target gas concentration in the standard gas pool is compared with the measured target gas concentration in the standard gas pool. If the error is greater than or equal to the preset value, the standard curve is replaced so that the concentration of the target gas in the motor vehicle exhaust gas to be measured next time can be calculated using the newly calibrated standard curve, making the measurement of the concentration of the target gas in the motor vehicle exhaust gas more timely and more accurate, and there will be no error in the concentration of the target gas in the motor vehicle exhaust gas measured because the standard curve has been used for a long time without being calibrated.

[0065] The control method of the motor vehicle exhaust telemetry system in the present embodiment, by setting the motor vehicle exhaust telemetry system to include a first optical path and a second optical path provided with a standard gas pool, obtains in real time a first measurement curve of the target gas passing through the first optical path and the target gas concentration in the standard gas pool, calibrates the standard curve in real time according to the second optical path, and calculates the concentration of the target gas in the motor vehicle exhaust according to the calibrated standard curve, the target gas concentration in the standard gas pool and the first measurement curve, so that the calculation of the concentration of the target gas in the motor vehicle exhaust is based on the calibrated standard curve, has high timeliness, and also makes the calculation of the concentration of the target gas in the motor vehicle exhaust more accurate, thereby preventing misjudgment of violations of motor vehicle exhaust emissions.

[0066] The control method of the motor vehicle exhaust telemetry system in this embodiment is to realize unattended automatic calibration by making the state in the calibration state in addition to the measurement state, and to update the calibration standard curve and the system background spectrum curve in real time, thereby reducing the measurement error caused by environmental changes, greatly improving the timeliness and accuracy of calibration and calibration, and thus improving the accuracy of the measurement data. That is, the trigger controller 10 of the motor vehicle exhaust telemetry system determines whether the system is in the measurement state, and if so, measures the target gas concentration of the motor vehicle exhaust. If the system is not in the measurement state, it automatically switches to the calibration state, and calibrates the standard curve and the background spectrum curve in the system to ensure timeliness and accuracy.

[0067] Specifically, the trigger controller 10 determines whether the system is in the measurement state by setting the motor vehicle position sensing infrared on both sides of the motor vehicle lane. When the car passes by the position sensing infrared, the position sensing infrared is blocked by the front of the motor vehicle. At this time, the system enters the measurement state. If the position sensing infrared is not blocked by the body, it indicates that the motor vehicle has driven out of the sensing range and the measurement is completed. At this time, the system automatically enters the calibration state. In order to prevent multiple vehicles from passing by at the same time and being unable to be monitored at the same time, the motor vehicle exhaust telemetry system in this embodiment enters the calibration state when it is not in the measurement state. As long as a car passes by, it enters the measurement state and automatically changes without human operation, which greatly improves the timeliness and accuracy of the calibration. Of course, in other embodiments, such as when there are fewer motor vehicles at night, in order to prevent frequent switching between the two states, in the non-measurement state, it can also be set to calibrate once every 2 minutes or 3 minutes.

[0068] The control method of the above-mentioned motor vehicle exhaust telemetry system in this embodiment can be applied to the control device of the above-mentioned motor vehicle exhaust telemetry system, and can also be applied to the control devices of other exhaust telemetry equipment. Specifically, the control device can be a server, or the control device can also be a motor vehicle exhaust telemetry system; that is, the execution subject of the control method of this embodiment can be a server, or a motor vehicle exhaust telemetry system, and of course, it can also be other devices that can implement the control method in this embodiment, and this embodiment does not limit this. The control component (the control component belongs to the control device) that controls the remote sensing monitoring of motor vehicle exhaust in this embodiment can be set on the motor vehicle exhaust telemetry system, or it can be set separately.

[0069] This embodiment also provides a control device for a motor vehicle exhaust telemetry system. The motor vehicle exhaust telemetry system includes a first optical path and a second optical path. A standard gas pool 11 is provided in the second optical path. The control device includes: a first processing unit, a second processing unit and a control unit.

[0070] The first processing unit is used to obtain a first measurement curve of the target gas passing through the first optical path. For details, please refer to the relevant description of step S101 in any of the above embodiments, which will not be repeated here; the second processing unit is used to obtain the target gas concentration of the target gas in the standard gas pool 11. For details, please refer to the relevant description of step S102 in any of the above embodiments, which will not be repeated here; the control unit is used to calibrate the standard curve according to the second optical path, and the standard curve is a standard curve of the concentration parameters of the target gas in the standard gas pool 11. For details, please refer to the relevant description of step S103 in any of the above embodiments, which will not be repeated here; according to the calibrated standard curve, the target gas concentration in the standard gas pool 11 and the first measurement curve, the concentration of the target gas in the exhaust gas of the motor vehicle is calculated. For details, please refer to the relevant description of step S104 in any of the above embodiments, which will not be repeated here.

[0071] By setting the motor vehicle exhaust telemetry system to include a first optical path and a second optical path provided with a standard gas pool, a first measurement curve of the target gas passing through the first optical path and the target gas concentration in the standard gas pool are obtained in real time, the standard curve is calibrated in real time according to the second optical path, and the concentration of the target gas in the motor vehicle exhaust is calculated according to the calibrated standard curve, the target gas concentration in the standard gas pool and the first measurement curve, so that the calculation of the concentration of the target gas in the motor vehicle exhaust is based on the calibrated standard curve, which has high timeliness, and also makes the calculation of the concentration of the target gas in the motor vehicle exhaust more accurate, thereby preventing misjudgment of violations of motor vehicle exhaust emissions.

[0072] This embodiment also provides a vehicle exhaust remote sensing system, such as Figure 1 As shown, it includes: a laser emitting device 3, a laser reflecting device, an optical path beam splitting device 4 and a signal processor 8.

[0073] The laser emitting device 3 is used to emit a modulated infrared laser spectrum; the laser reflecting device is used to return the spectrum absorbed by the motor vehicle exhaust to the telemetry host 1; the optical path beam splitting device 4 is used to divide the spectrum returned to the telemetry host 1 into two paths, one of which leads to the first photoelectric detection device 5, and the other leads to the second photoelectric detection device 6 after passing through the standard gas pool 11. The spectral signals obtained by the first photoelectric detection device 5 and the second photoelectric detection device 6 are amplified by the phase-locked amplifier 7 to obtain the second-order harmonic absorption signal and then transmitted to the signal processor 8; the signal processor 8 calculates the concentration information of the gas in the motor vehicle exhaust according to the spectrum after passing through the first photoelectric detection device 5 and the second photoelectric detection device 6. The signal processor 8 includes a memory and a processor, and the memory and the processor are connected to each other in communication. Computer instructions are stored in the memory. The processor executes the computer instructions, thereby the above-mentioned motor vehicle exhaust telemetry system control method is realized, and the entire motor vehicle exhaust telemetry system is controlled by the industrial computer 9.

[0074] Among them, the laser emitting device 3, the optical path beam splitter 4, and the signal processor 8 are arranged in the telemetry host 1, and the laser reflecting device is arranged in the telemetry slave 2. By arranging the laser emitting device 3, the optical path beam splitter 4 and the signal processor 8 in the telemetry host 1, and the laser reflecting device in the telemetry slave 2, the laser emitted from the telemetry host 1 can be easily reflected back to the telemetry host 1 by the reflecting device in the telemetry slave 2, and the laser reflected back to the telemetry host 1 can be received by the optical path beam splitter 4 in the telemetry host 1, and processed by the signal processor 8 in time, and such an arrangement also makes the overall structure of the system more compact.

[0075] Since four target gases, CO2, CO, HC and NO, need to be measured in this embodiment, four laser emitting devices 3 are used, and the spectrum emitted by each laser emitting device 3 measures one target gas, and the spectra of the four target gases all use the same first optical path and second optical path. Of course, in other embodiments, the number of laser emitting devices can be specifically set according to the number of target gases, and no excessive restrictions are made here.

[0076] The optical path beam splitter 4 in this embodiment divides the spectrum returned to the telemetry host 1 into two beams of equal energy, the first optical path enters the first photoelectric detection device 5, and the second optical path enters the second photoelectric detection device 6 after passing through the standard gas pool 11. The standard gas pool 11 in this embodiment is a tubular pool of about 10 cm in length, with an infrared transmission window material at the end, which is filled with a target gas of a specific concentration.

[0077] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A control method for a motor vehicle exhaust telemetry system, characterized in that: The motor vehicle exhaust remote sensing system comprises a first optical path and a second optical path, wherein a standard gas pool is provided in the second optical path, and the control method comprises: Acquiring a first measurement curve of the target gas passing through the first optical path includes: Obtaining a background spectrum curve V0 of the target gas in the motor vehicle exhaust telemetry system; Obtaining a direct measurement curve V1 of the target gas passing through the first optical path; Calculating a first measurement curve C1=V1-V0 of the first optical path, wherein C1 is a real-time curve obtained by deducting the values ​​of each time period corresponding to the background spectrum curve from the real-time values ​​of each time period actually measured for V1; Obtain the target gas concentration in the standard gas pool, the concentration of the target gas N 测 Calculated by the following formula: N 测 =N 标 *C1 / C 标 Wherein, C1 is the first measurement curve of the target gas passing through the first optical path; N 标 is the target gas concentration of the target gas in the standard gas cell; C 标 is the standard curve; C1 / C 标 Refers to C1 and C 标 The ratios of the maximum amplitudes of the corresponding curves; The standard curve is calibrated according to the second optical path, wherein the standard curve is a standard curve of a concentration parameter of a target gas in a standard gas pool, and the calibrating the standard curve according to the second optical path includes: Acquire a second measurement curve C2 of the target gas passing through the second optical path; Calculate the concentration of the target gas in the calibration gas pool: N 标 ’ =N 标 *C2 / C 标 , where C2 / C 标 Refers to C2 and C 标 The ratios of the maximum amplitudes of the corresponding curves; Judge N 标 ’ With N 标 Whether the error is greater than or equal to the preset value; If the N 标 ’ With N 标 If the error is greater than or equal to the preset value, the standard curve C 标 ’ =C2-C1, where C 标 ’ The curve is obtained by deducting the calculated real-time value of C1 from the actually measured real-time value of C2; The concentration of the target gas in the exhaust gas of the motor vehicle is calculated according to the calibrated standard curve, the concentration of the target gas in the standard gas pool and the first measurement curve.

2. The control method of the vehicle exhaust telemetry system according to claim 1, characterized in that: The preset value is 5%.

3. The control method of the vehicle exhaust telemetry system according to claim 1, characterized in that: The step of obtaining a second measurement curve C2 of the target gas passing through the second optical path comprises: Get the background spectrum curve V0 of the target gas ’ =V1; Obtaining a direct measurement curve V2 of the target gas passing through the second optical path; A second measurement curve C2 = V2 - V1 of the second optical path is calculated, wherein C2 is a real-time curve obtained by deducting the values ​​of each time period corresponding to the background spectrum curve from the real-time values ​​of V2 in each time period actually measured.

4. A control device for a motor vehicle exhaust remote sensing system, based on the control method for a motor vehicle exhaust remote sensing system according to claim 1, characterized in that: The motor vehicle exhaust remote sensing system comprises a first optical path and a second optical path, wherein a calibration gas pool is arranged in the second optical path, and the control device comprises: A first processing unit, used for obtaining a first measurement curve of the target gas passing through the first optical path; A second processing unit, used for obtaining a target gas concentration of the target gas in the standard gas pool; The control unit is used to calibrate the standard curve according to the second optical path, wherein the standard curve is a standard curve of the concentration parameters of the target gas in the standard gas pool; and calculate the concentration of the target gas in the exhaust gas of the motor vehicle according to the calibrated standard curve, the target gas concentration in the standard gas pool and the first measurement curve.

5. A motor vehicle exhaust telemetry system, characterized in that: include: A laser emitting device (3) for emitting a modulated infrared laser spectrum; A laser reflection device for returning the spectrum of the absorbed motor vehicle exhaust gas to the telemetry host (1); An optical path splitting device (4) is used to split the optical spectrum returned to the telemetry host (1) into two paths, one of which leads to the first photoelectric detection device (5) and the other leads to the second photoelectric detection device (6) after passing through the standard gas pool (11); A signal processor (8) is connected to the first photoelectric detection device (5) and the second photoelectric detection device (6), and calculates the concentration information of the gas in the exhaust gas of the motor vehicle according to the spectrum after passing through the first photoelectric detection device (5) and the second photoelectric detection device (6). The signal processor (8) includes a memory and a processor, and the memory and the processor are communicatively connected to each other. Computer instructions are stored in the memory, and the processor executes the control method of the motor vehicle exhaust telemetry system according to any one of claims 1 to 3 by executing the computer instructions.

6. The vehicle exhaust remote sensing system according to claim 5, characterized in that: The laser emitting device (3), the optical path beam splitting device (4), and the signal processor (8) are arranged in the telemetry host machine (1), and the laser reflecting device is arranged in the telemetry auxiliary machine (2).

7. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute the control method of the motor vehicle exhaust telemetry system according to any one of claims 1-3.

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