GB 18285-2000 Limits and test methods for exhaust pollutants from in-use vehicles
Some standard content:
GB 18285—2000
This standard is a mandatory standard.
This standard is formulated to control the emission of exhaust pollutants from in-use vehicles and improve the quality of ambient air. The limits and test methods of the accelerated simulated working condition test of this standard are formulated with reference to the US Environmental Protection Agency standard EPA-AA-RSPD-IM-96-2 "Technical Guidelines for Accelerated Simulated Working Condition Test Procedures, Emission Standards, Quality Control Requirements and Equipment Technical Requirements" (July 1996). For vehicles equipped with compression ignition engines that have passed Class C certification according to GB14761-1999, the sampling type opacity meter is used to conduct free acceleration visible pollutant emission tests, replacing the filter paper smoke meter in the previous standards. Therefore, the test method and smoke unit are completely different from the previous standards.
Appendix A and Appendix B of this standard are appendices to the standard. Appendix C and Appendix D are informative appendices. This standard is proposed by the Ministry of Transport of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Automobile Maintenance Standardization. The drafting unit of this standard: Highway Science Research Institute of the Ministry of Transport. The main drafters of this standard are Wang Xiaohui and Han Guoqing. 576
1 Scope
National Standard of the People's Republic of China
Limits and measurement methodsfor exhaust pollutants from in-use vehicles This standard specifies the limits and test methods for exhaust pollutants from in-use vehicles. GB 18285-2000
This standard applies to in-use vehicles equipped with spark-ignition four-stroke engines and compression-ignition engines, with a maximum total mass greater than or equal to 400kg and a maximum design speed greater than or equal to 50km/h. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB252-1994 Light diesel oil
GB/T3845--1993 Measurement of exhaust pollutants from gasoline vehicles-Rapid method GB/T3846--1993 Measurement of free acceleration smoke density from diesel vehicles-Filter paper smoke density method GB3847--1999 Limits and test methods for visible pollutants from exhaust of compression ignition engines and vehicles equipped with compression ignition engines GB14761-1999 Limits and test methods for pollutants emitted by automobiles GB/T15089-1994 Motor vehicle classification
GB17930-1999 Unleaded gasoline for vehicles
SY/T7546--1996 Compressed natural gas for automobilesSY7548-1998 Liquefied petroleum gas for automobiles 3 Definitions
This standard adopts the following definitions.
3.1 In-use vehicles Vehicles that have been licensed.
3.2 Light duty vehicles Vehicles of type M and N, with a maximum gross mass not exceeding 3500kg. 3.3 Heavy duty vehicles Vehicles with a maximum gross mass greater than 3500kg. 3.4 Vehicles of type M, N, Mi and Ni Vehicles specified in GB/T15089.
Approved by the State Administration of Quality and Technical Supervision on 2000-12-28 and implemented on 2001-07-01
3.5 Reference mass (RM) Reference mass refers to the vehicle's "curb mass" plus 100kg. GB 18285 -- 2000
3.6 Maximum total mass (GTM) Maximum total mass refers to the maximum mass technically permitted by the vehicle manufacturer. 3.7 Gas pollutants Gas pollutants Refers to carbon monoxide (CO), hydrocarbons (HC) and nitrogen oxides (NOx). Hydrocarbons are expressed as n-hexane equivalents. Nitrogen oxides are expressed as nitrogen monoxide (NO).
3.8 Exhaust pollutants For vehicles powered by spark-ignition engines, it refers to gaseous pollutants discharged from the exhaust pipe. For vehicles powered by compression-ignition engines, it refers to visible pollutants discharged from the exhaust pipe. 3.9 Acceleration simulation mode After the vehicle is preheated to the specified thermal state, it is accelerated to the specified speed. According to the acceleration load at the specified speed of the vehicle, the vehicle is loaded through the dynamometer. The vehicle maintains a constant speed operation, which is the acceleration simulation mode. 4 Test classification and test methods
4.1 Test classification
The test is divided into the test of vehicles equipped with spark-ignition engines and the test of vehicles equipped with compression-ignition engines. 4.1.1 The test of vehicles equipped with spark-ignition engines is carried out in rapid speed test, dual speed test and acceleration simulation mode (ASM) test. 4.1.1.1 Dual idle test or acceleration simulation (ASM) test M1 vehicles that have passed Class B certification according to GB14761, with a design passenger number of no more than 6 and a maximum total mass of no more than 2500kg, and M and NI vehicles that have passed Class B certification according to GB14761, with a design passenger number of more than 6 or a maximum total mass of more than 2500kg but not more than 3500kg, shall be subject to dual idle test or acceleration simulation (ASM) test. 4.1.1.2 Other M and N vehicles equipped with spark ignition engines, except those specified in Article 4.1.1.1, shall be subject to idle test. 4.1.2 Test of vehicles equipped with compression ignition engines 4.1.2.1 Vehicles that have passed Class C certification according to GB14761 shall be subject to free acceleration exhaust visible pollutant test. 4.1.2.2 Other vehicles equipped with compression ignition engines, except those specified in Article 4.1.2.1, shall be subject to free acceleration smoke test. 4.2 Test methods
4.2.1 Double rapid test
The test shall be conducted in accordance with the provisions of Appendix C of GB/T3845-1993. 4.2.2 Acceleration simulation working condition test
The test shall be conducted in accordance with Appendix A (Appendix of the standard). 4.2.3 Rapid test
The test shall be conducted in accordance with the provisions of GB/T3845.
4.2.4 Free acceleration test
4.2.4.1 Free acceleration exhaust visible pollutant test shall be conducted in accordance with Appendix B (Appendix of the standard). 4.2.4.2 Free acceleration smoke density test shall be conducted in accordance with the provisions of GB/T3846. 5 Exhaust pollutant limits
5.1 Exhaust pollutant limits for vehicles equipped with spark-ignition engines 5.1.1 Exhaust pollutant limits for vehicles equipped with spark-ignition engines in double-speed tests are shown in Table 1. 578
GB 18285—2000
Table 1 Exhaust pollutant limits for vehicles equipped with spark-ignition engines in double-speed tests Vehicle type
M,2 vehicles licensed after January 1, 2001 N3 vehicles licensed after January 1, 2002 1) HC volume concentration values are based on normal hexane equivalent. co
10~61)
High speed
2) M means that the number of designed passengers (including the driver) of the vehicle does not exceed 6, and the maximum total mass of the vehicle does not exceed 2500kg. 3) N, also includes M-type vehicles with a designed number of passengers (including the driver) exceeding 6 persons, or with a maximum total mass exceeding 2500kg but not exceeding 3500kg. 5.1.2 The exhaust pollutant limits for vehicles equipped with spark-ignition engines in the accelerated simulated operating condition test are shown in Table 2. Table 2 Exhaust pollutant limits for vehicles equipped with spark-ignition engines in the accelerated simulated operating condition test Reference mass
Vehicle type
M.\-type vehicles licensed after January 1, 2001
N,\-type vehicles licensed after January 1, 2002
HC/10-6
ASM5025
NO/10-6
HC/10-6\
1) HC volume concentration values are based on n-hexane equivalent. 2) M, refers to vehicles with a designed number of passengers (including the driver) not exceeding 6 persons, and a maximum gross vehicle mass not exceeding 2500kg. ASM2540
NO/10-6
3) N, also includes M-type vehicles with a designed number of passengers (including the driver) exceeding 6 persons, or a maximum gross vehicle mass exceeding 2500kg but not exceeding 3500kg. 5.1.3
The limits of exhaust pollutants from the rapid test of vehicles equipped with spark ignition engines are shown in Table 3. Table 3 Limits of exhaust pollutants from the rapid test of vehicles equipped with spark ignition engines Light vehicles
Vehicle type
Vehicles in use manufactured before July 1, 1995 Vehicles in use manufactured from July 1, 1995 onwards 1) HC volume concentration values are based on normal hexane equivalent. co
10-g1)
10-6l)
GB18285—2000
5.2 Limits of exhaust pollutants from the free acceleration test of vehicles equipped with compression ignition engines 5.2.1 The limits of visible pollutants from the free acceleration test of vehicles equipped with compression ignition engines are shown in Table 4. Table 4 Limits of visible pollutants in exhaust gas from free acceleration test for vehicles equipped with compression ignition engines Vehicle type
In-use vehicles licensed on or after January 1, 2001 In-use vehicles equipped with exhaust turbochargers licensed on or after January 1, 2001 5.2.2
For the smoke emission limits in free acceleration test for vehicles equipped with compression ignition engines, see Table 5. Table 5 Free acceleration test for vehicles equipped with compression ignition engines Smoke emission limit values Vehicles
In-use vehicles manufactured before July 1, 1995 In-use vehicles manufactured on or after July 1, 1995
Light absorption coefficient
Smoke value
A1 Test operating cycle on chassis dynamometer GB18285--2000
Appendix A
(Appendix to the standard)
Acceleration simulation operating condition test
A1.1 The test operating cycle on the chassis dynamometer consists of two operating conditions, ASM5025 and ASM2540, as shown in Figure A1 and Table A1.
(5025)90
(2540)90
Acceleration simulation working condition (ASM) test operation cycle table A1
A1.1.1 ASM5025 working condition
Operation sequence
Acceleration simulation working condition (ASM) test operation cycle table Speed
0→25
Operation time t
Time/s
Test time t
The preheated vehicle is accelerated to 25.0km/h, and the dynamometer loads the vehicle with 50% of the output power when the vehicle speed is 25.0km/h and the acceleration is 1.475m/s2 as the set power. The vehicle runs continuously for 10s at a speed of 25.0km/h±1.5km/h, the working condition timer starts timing (t=0s), and it runs continuously for 90s (t=90s), which is the ASM5025 working condition. A1.1.2ASM2540 working condition
After the ASM5025 working condition test, the vehicle is immediately accelerated to 40.0km/h, and the dynamometer loads the vehicle with 25% of the output power when the vehicle speed is 40.0km/h and the acceleration is 1.475m/s2 as the set power. The vehicle runs continuously for 10s at a speed of 40.0km/h±1.5km/h, the working condition timer starts timing (t=0s), and it runs continuously for 90s (t=90s), which is the ASM2540 working condition. A1.1.3 Re-inspection test
If the first test fails, a re-inspection test can be carried out. ASM5025 and ASM2540 conditions are tested continuously, and the test time of each condition is extended to 145s (t=145s), and the repeated test time of the two conditions is 290s (t=290s). A2 Vehicle and fuel
A2.1 Test vehicle
GB18285--2000
A2.1.1 The mechanical condition of the vehicle should be good, without mechanical failures that affect safety or cause test deviations. A2.1.2 There should be no leakage in the vehicle's intake and exhaust systems. A2.1.3 There should be no liquid leakage in the vehicle's engine, gearbox and cooling system. A2.1.4 The tire surface wear should comply with the provisions of relevant standards. The tire pressure of the driving wheel should comply with the regulations of the manufacturer. A2.2 Fuel
Unleaded gasoline or compressed natural gas or liquefied petroleum gas should be used. Unleaded gasoline shall comply with the provisions of GB17930; compressed natural gas shall comply with the provisions of SY/T7546, and liquefied petroleum gas shall comply with the provisions of SY7548. A3 Technical requirements for test equipment
The test equipment shall comply with the provisions of relevant national standards and metrological verification procedures. A3.1 Chassis dynamometer
A3.1.1 The dynamometer structure shall be suitable for M and N class vehicles with a maximum total mass not exceeding 3800kg. A3.1.2 Based on the vehicle parameters recorded in the test, the dynamometer shall be able to automatically select the loading power of the test condition. A3.1.3 Dynamometer power absorption device
A3.1.3.1 The set dynamometer loading power shall be stable and there shall be no fluctuations that affect the normal operation of the vehicle. When setting the load power of the dynamometer on the vehicle, the friction loss power between the wheel and the roller surface and the internal power loss of the dynamometer should be taken into account, and the power setting should be carried out according to the following formula: P - Pt - P- Pt
Where: P is the set power value, determined according to the reference mass and the test conditions, kW, P; - the indicated power of the dynamometer, kW;
P. The output power of the vehicle under the specified working conditions, kW; Pt - - the friction loss power between the roller and the tire surface of the dynamometer, kW; P. The internal power loss of the dynamometer, kW.
A3.1.3.2 The power absorption device of the dynamometer should be able to meet the test load requirements of the M and N category vehicles with a maximum gross mass (GTM) less than 3800kg when the ASM5025 and ASM2540 working conditions are carried out. When the roller speed is greater than 22.5km/h, the power absorbed by the power absorption device should be no less than 15kW, and the stable test state should be no less than 5min, with an interval of 3min between each test. A3.1.3.3 The dynamometer should be calibrated regularly to determine the internal power loss of the system (including bearing friction loss, system drive friction loss and windage loss, etc.).
A3.1.3.4 An electric power absorption device should be used. At a speed of 25km/h and 40km/h, the dynamometer power absorption should be adjustable in units of 0.1kW. The accuracy of the power setting should be ±0.5kW. A3.1.4 Roller
A3.1.4.1 The dynamometer should be equipped with double rollers. The roller diameter is between 200mm and 530mm. Left and right movable rollers or fixed rollers can be used. The inner span of the fixed roller is less than 760mm and the outer span is greater than 2540mm. A3.1.4.2 Requirements for roller center distance
L(620+D)·sin31.5
Where: L roller axis distance, mm,
D—roller diameter, mm.
The roller axis distance tolerance is -6.5mm～12.5mm. A3.1.4.3 Under any climatic conditions, the roller size, surface treatment and hardness shall ensure that the tire does not slip; the test distance and speed accuracy are constant; the tire wear is small and the noise is low.
A3.1.5 Inertia
A3.1.5.1 Basic inertia
GB 18285—2000
The dynamometer shall be equipped with a mechanical flywheel or inertia simulation device to enable the dynamometer to have a basic inertia of 800kg±20kg, and the basic inertia deviation shall be indicated.
A3.1.5.2 Inertia simulation
The dynamometer should be able to simulate the transient inertia of a vehicle with a reference mass less than 3500kg at an acceleration of 0 to 1.475m/s2. The maximum simulated output power of the dynamometer when accelerating a vehicle with an inertia of 800 to 2700kg and a speed of 25m/s should be greater than 18kW. The inertia simulation deviation should be indicated, and the inertia simulation should be corrected accordingly. A3.1.5.3 Inertia simulation system response
The inertia simulation torque response should reach 90% of the final value of the torque change within 0.5s. A3.1.5.4 Inertia simulation error
The inertia simulation error should not exceed 10% of the inertia mass selected for the test vehicle. A3.1.6 Other requirements
A3.1.6.1The dynamometer should have a roller speed measurement device. The maximum vehicle speed that the dynamometer can reach is 90km/h. When the vehicle speed is greater than 10 km/h, the measurement accuracy should be ±1.0 km/h. A3.1.6.2 The dynamometer should be equipped with a limit system. The limit system should ensure that the horizontal and vertical forces applied to the drive wheels have no effect on emission measurements.
43.1.6.3 The dynamometer should be equipped with a device to cool the vehicle. The cooling system should be activated when the ambient temperature exceeds 295K (22°C). Cooling the vehicle's catalytic converter should be avoided.
A3.1.6.4 The installation of the dynamometer should ensure that the test vehicle is in a horizontal position when tested on the dynamometer. A3.1.6 Four-wheel drive dynamometer
The four-wheel drive dynamometer should be able to perform the test according to A3.1.3.The provisions of 1 shall be correctly loaded on the vehicle, shall not damage the four-wheel drive system of the vehicle, and shall be applicable to vehicles equipped with anti-lock braking systems and traction control systems. The synchronous error of the rolling speed of the front and rear wheels shall be less than 0.3 km/h. A3.2 Measuring instruments
A3.2.1 Exhaust gas analyzer
A3.2.1.1 The sampling system shall have a water separation system, a particle filter, a sampling pump and a flow control unit, which shall be reliable, durable, leak-free and easy to maintain. The manufacturing materials in contact with the sampled gas shall not react with the sampled gas and shall not contaminate the sampled gas or change the characteristics of the analyzed gas. The sampling system must be corrosion-resistant and able to withstand the vehicle exhaust temperature of 290s under the ASM test condition. A3.2.1.2 The depth of the sampling probe inserted into the vehicle exhaust pipe shall be no less than 400 mm, and the materials used shall be able to withstand the exhaust temperature of 873K (600°C).
A3.2.1.3 The exhaust gas analyzer shall be able to test vehicles with dual exhaust pipes. The double sampling probes shall ensure the same flow rate in each branch pipe. A3.2.1.4 Exhaust ventilation system
The ventilation system shall not cause the exhaust gas at the probe sampling point to be diluted and shall not cause the vehicle exhaust outlet pressure to change by more than 0.25 kPa. A3.2.1.5 The exhaust gas analyzer shall be able to meet the exhaust gas concentration test capability at least once per second. A3.2.1.6 The system sampling and analysis shall automatically stop working in the following situations: - The exhaust gas analyzer is not preheated;
- The interference of irrelevant gases exceeds ±10×10-°HC, ±0.05%CO, ±0.20%CO, and ±25×10-6NO, - The HC residual concentration in the sampling system is greater than 10×10- - The zero drift or the reading drift during calibration exceeds the analyzer adjustment range. A3.2.1.7 The exhaust gas analyzer shall be able to resist electromagnetic interference and vibration shock. A3.2.1.8 Response requirements for exhaust gas analyzers
For HC, CO, and CO2 analysis, the response time from the probe inputting the measured gas to the display of 90% of the final value should be less than 8s, and the response time for the display of 95% of the final value should be less than 12s; for NO analysis, the response time from the probe inputting the measured gas to the display of 90% of the final value should be less than 12s, and the response time for the NO stable value reading to drop to 10% of the stable reading value should be less than 12s. A3.2.1.9 HC, CO, and CO. analysis should use a non-dispersive infrared absorption (NDIR) analyzer, and NO analysis should use an electrochemical sensor analyzer. The instrument range and measurement error should meet the requirements of Table A2 (any relative error or absolute error can be met). Table A2 Instrument range and measurement error requirements
Gas type
0～2 000×10-6
2 001×10-6～9 000×10-6
0～10%
10.01%~14%
16%~18%
0～~4 000×10-6
4 000×10-6~5 000×10-6
A3.2.2 Other measuring devices
A3.2.2.1 Hygrometer
The relative humidity measurement range should be 5%~95%, and the measurement accuracy should be ±3%. A3.2.2.2 Thermometer
Measurement error
Relative error
The temperature measurement range should be 255～333K (-18℃～60℃), and the measurement accuracy should be ±1.5K. A3.2.2.3 Barometer
The air pressure measurement range should be 80～110kPa, and the measurement accuracy should be 土3%. A3.2.2.4 Timer
The timer 10～1000s measurement accuracy should be 土0.1%. A3.2.3 The display resolution of the measuring instrument should meet the requirements of Table A3 Table A3 Display resolution of measuring instrument
Relative humidity
Dry bulb temperature
Barometer pressure
A3.3 Automatic detection control system and display. Resolution
1×10-° (n-hexane equivalent)
1×10-8
Absolute error
±10×10-6
±25×10-6
A3.3.1 The automatic detection control system should be able to automatically set the loading load and select the emission standard according to the input vehicle parameters. The detection program data acquisition and analysis and judgment of the detection results should be automatically controlled by the computer. A3.3.2 The automatic detection control system should take into account the response time of the exhaust gas analyzer to ensure that the recorded exhaust pollutant detection values correspond to the corresponding test condition record values.
A3.3.3 The system should be equipped with a clearly visible driver guidance device. The guidance device should continuously display the required speed, test condition time, driving 584
GB 18285—2000
actual speed and time, as well as other necessary prompts and warnings. A4 Test preparation
A4.1 Vehicle preparation
A4.1.1 If necessary, test instruments such as cooling water and lubricating oil thermometers may be installed on the engine. A4.1.2 Accessories such as air conditioners and heaters shall be turned off. Vehicles equipped with traction control devices shall turn off the traction control device. A4.1.3 Vehicle preheating: Before the test, the thermal state of each assembly of the vehicle shall comply with the provisions of the vehicle technical conditions and remain stable. If the waiting time of the vehicle before the test exceeds 20 minutes or the engine is turned off for more than 5 minutes before the test, the vehicle shall be preheated by any of the following methods: - The vehicle is operated at a speed of 2500r/min for 4 minutes under no-load conditions; - The vehicle is operated on the dynamometer according to the ASM5025 working condition for 60 seconds. A4.1.4 Use of transmission
Vehicles equipped with automatic transmissions shall be tested in forward gear. Vehicles equipped with manual transmissions shall use second gear. If the maximum speed that can be achieved in second gear is less than 45km/h, third gear may be used. A4.1.5 The vehicle's driving wheels should be on rollers, and the vehicle's lateral stability must be ensured. The driving tires should be dry and non-slip. A4.1.6 The vehicle should be well limited. For front-wheel drive vehicles, the parking brake should be applied before the test. A4.1.7 The vehicle is not allowed to brake during the test condition timing. If the vehicle brakes, the condition start timing should be reset to zero (t-0). A4.2 Equipment preparation and setting
A4.2.1 Exhaust gas analyzer preheating
Should reach stability within 30 minutes after power-on. Without adjustment within 5 minutes, the zero position and the distance readings of HC, CO, NO and CO should be stable within the error range.
A4.2.2 Within 2 minutes before each test, the analyzer should complete automatic zeroing, ambient air measurement and HC residual inspection. A4.2.3 Dynamometer preheating
The dynamometer should be automatically preheated before the test if it is stopped or the speed is less than 25km/h for more than 30 minutes. A4.2.4 Load setting
Before each working condition test, the dynamometer shall automatically set the load on the vehicle according to the input vehicle parameters and test conditions in accordance with the requirements of A3.1.3.1.
A4.3 The ambient temperature, relative humidity and atmospheric pressure shall be recorded before the test cycle begins. A4.4 If the sum of CO and CO? concentrations is less than 6%, or the engine is turned off at any time, the test shall be terminated and the emission measurement shall be invalid. A5 Test procedure
A5.1 The vehicle driving wheel is located on the dynamometer roller. The analyzer sampling probe is inserted into the exhaust pipe to a depth of 400mm and fixed on the exhaust pipe. Multiple exhaust pipes working independently shall be sampled simultaneously. A5.2ASM5025 working condition
After the vehicle is preheated, it is accelerated to 25km/h. The dynamometer is loaded according to the test condition requirements. The vehicle maintains a constant speed of 25km/h±1.5km/h for 10s and then starts timing (t=0s). When the speed and torque deviation of the dynamometer exceeds the set value for more than 5s, the test should be restarted. After 25s (t=25s), the analyzer starts measuring once per second, and calculates the emission average within 10s based on the dilution correction factor and the humidity correction factor. The test condition ends after running for 90s (t=90s). Within the allowable error range of the test vehicle speed of 25km/h±1.5km/h, the loading torque of the dynamometer should be adjusted accordingly with the change of vehicle speed to ensure that the loading power does not change with the vehicle speed. The allowable error of torque is ±5% of the set torque of this condition.
During the measurement process from 25s to 90s, if the vehicle speed change from the first second to the tenth second within any 10s is less than ±0.5km/h relative to the first second, the test result is valid. If the average value of ten emissions within any 10s meets the limit requirements after correction, the test ends; otherwise, the next condition (ASM2540) test should be carried out.
A5.3ASM2540 working condition
GB18285-2000
The vehicle accelerates directly from 25km/h to 40km/h. The dynamometer is loaded according to the test working condition requirements. The vehicle maintains a constant speed of 40km/h±1.5km/h. After 10s, the timing starts (t=0s). When the dynamometer speed and torque deviation exceed the set value for more than 5s, the test should be restarted. After 25s (t=25s), the analyzer starts measuring once per second, and calculates the emission average value within 10s based on the dilution correction factor and humidity correction factor. The test working condition ends after running for 90s (t==90s). Within the allowable error range of the test vehicle speed of 40km/h±1.5km/h, the loading torque should be adjusted accordingly with the change of vehicle speed to ensure that the loading power does not change with vehicle speed. The torque allowable error is ±5% of the set torque of this working condition. During the measurement process from 25s to 90s, if the change in vehicle speed from the first second to the tenth second within any 10s is less than ±0.5km/h relative to the second, the test result is valid. If the average value of ten emissions within any 10s meets the limit requirements after correction, the test is terminated. Otherwise, a retest should be conducted.
A5.4 Retest test
Continuously conduct ASM5025 and ASM2540 operating condition tests in accordance with the test procedures and test result judgment methods of A5.2 and A5.3, and extend the operating time to 145s (t=145s), with a total test time of 290s. If the test results of the two operating conditions meet the requirements after correction, the test results are qualified, otherwise the test results are unqualified. A6 Calculation of exhaust pollutant measurement values
The emission test results should be dilution corrected and humidity corrected, and the arithmetic mean of 10 valid tests should be calculated. The measurement result calculation formula is as follows:
(Chc(i) - DF(i)
Wherein: CHc——average HC emission concentration, %; Cco
-average CO emission concentration, 10-\,
CNo—-average NO emission concentration, 10-
-HC measurement concentration at the i-th second, %;
CHc(i)—
Cco(i) -
Cno(i)
kH(i) -
Cco(i) · DF(i)
ZCno(i) . DF(i) · kg()
CO measurement concentration at the ith second, 10-;
NO measurement concentration at the ith second, 10-°;
dilution factor at the ith second;
humidity correction factor at the ith second.
A6.1 Dilution Correction
The CO, HC, and NO measurement values of the ASM emission test should be multiplied by the dilution factor (DF) for correction. When the calculated dilution factor is greater than 3.0, the dilution factor is taken as 3.0.
The dilution factor calculation formula is as follows:
a + 1. 88X
CcO2楼
Cco2 + Ccom
Wherein: DF-
dilution factor;
GB182852000
CO, emission concentration measurement correction value, %;
CO emission concentration measurement value, %;
CO emission concentration measurement value, %;
Fuel calculation coefficient, select the following values according to the type of fuel: gasoline - 4.644;
Compressed natural gas - —6.64,
Liquefied petroleum gas ~ —5.39.
A6.2NO measurement value should be multiplied by relative humidity correction factor kH for correction. Humidity correction factor calculation formula is as follows:
kH = 1- 0. 004 7(H - 75)
Where: kH humidity correction factor,
absolute humidity g water/kg dry air; www.bzxz.net
R.-relative humidity of ambient air, %;
43.478 X RaPd
P=(Pa.R./100)
PaSaturated vapor pressure at ambient temperature, kPa. If the temperature is greater than 30℃, the saturated vapor pressure at 30℃ shall be used instead; PB--atmospheric pressure, kPa.
A7 Test results
Test equipment and test results shall be recorded in accordance with Appendix D (Suggested Appendix) D2. Appendix B
(Standard Appendix)
Free acceleration exhaust visible pollutant test
B1 Vehicle and fuel
B1.1 Vehicle
B1.1.1 The vehicle intake system shall be equipped with an air filter, and the exhaust system shall be equipped with a muffler and shall not have leakage. B1.1.2 During the measurement, the engine's cooling water and lubricating oil temperatures shall reach the hot state specified in the vehicle's manual. B1.1.3 The vehicle shall not be operated rapidly for a long time before the test. B1.2 Fuel
Diesel shall be used, and smoke suppressant additives shall not be added. Diesel fuel shall comply with the provisions of GB252. Test instrument
A sampling type opacity meter shall be used, and the technical requirements shall comply with the relevant provisions of Appendix G and Appendix H of GB3847-1999. B3 Test procedure
B3.1 With the vehicle engine idling, insert the sampling probe of the opacity meter in accordance with the requirements of Appendix H of GB3847-1999. B3.2 Quickly but not violently press the accelerator pedal to allow the injection pump to supply the maximum amount of fuel. Maintain this position until the engine reaches the maximum speed allowed by the governor. Once the maximum speed is reached, release the accelerator pedal immediately to return the engine to idle speed and the opacity meter to the corresponding 587644;
Compressed natural gas - 6.64,
Liquid petroleum gas ~ - 5.39.
A6.2NO measured value should be multiplied by relative humidity correction factor kH for correction. Humidity correction factor calculation formula is as follows:
kH = 1- 0. 004 7(H - 75)
Where: kH humidity correction factor,
absolute humidity g water/kg dry air;
R.-Relative humidity of ambient air, %;
43.478 X RaPd
P=(Pa.R./100)
Pa saturated vapor pressure at ambient temperature, kPa, if the temperature is greater than 30℃, the saturated vapor pressure at 30℃ should be used instead; PB-atmospheric pressure, kPa.
A7 Test results
Test equipment and test results shall be recorded in accordance with Appendix D (Suggested Appendix) D2. Appendix B
(Standard Appendix)
Free acceleration exhaust visible pollutant test
B1 Vehicle and fuel
B1.1 Vehicle
B1.1.1 The vehicle intake system shall be equipped with an air filter, and the exhaust system shall be equipped with a muffler and shall not have leakage. B1.1.2 During the measurement, the temperature of the engine's cooling water and lubricating oil shall reach the hot state specified in the vehicle's manual. B1.1.3 The vehicle shall not be run rapidly for a long time before the test. B1.2 Fuel
Diesel shall be used, and smoke suppressant additives shall not be added. Diesel shall comply with the provisions of GB252. Test instrument
A sampling type opacity meter shall be used, and the technical requirements shall comply with the relevant provisions of Appendix G and Appendix H of GB3847-1999. B3 Test Procedure
B3.1 With the vehicle engine idling, insert the opacity meter sampling probe according to the requirements of Appendix H of GB3847-1999. B3.2 Quickly but not violently step on the accelerator pedal to allow the fuel injection pump to supply the maximum amount of fuel. Maintain this position before the engine reaches the maximum speed allowed by the governor. Once the maximum speed is reached, immediately release the accelerator pedal to return the engine to idle speed and the opacity meter to the corresponding 587644;
Compressed natural gas - 6.64,
Liquid petroleum gas ~ - 5.39.
A6.2NO measured value should be multiplied by relative humidity correction factor kH for correction. Humidity correction factor calculation formula is as follows:
kH = 1- 0. 004 7(H - 75)
Where: kH humidity correction factor,
absolute humidity g water/kg dry air;
R.-Relative humidity of ambient air, %;
43.478 X RaPd
P=(Pa.R./100)
Pa saturated vapor pressure at ambient temperature, kPa, if the temperature is greater than 30℃, the saturated vapor pressure at 30℃ should be used instead; PB-atmospheric pressure, kPa.
A7 Test results
Test equipment and test results shall be recorded in accordance with Appendix D (Suggested Appendix) D2. Appendix B
(Standard Appendix)
Free acceleration exhaust visible pollutant test
B1 Vehicle and fuel
B1.1 Vehicle
B1.1.1 The vehicle intake system shall be equipped with an air filter, and the exhaust system shall be equipped with a muffler and shall not have leakage. B1.1.2 During the measurement, the temperature of the engine's cooling water and lubricating oil shall reach the hot state specified in the vehicle's manual. B1.1.3 The vehicle shall not be run rapidly for a long time before the test. B1.2 Fuel
Diesel shall be used, and smoke suppressant additives shall not be added. Diesel shall comply with the provisions of GB252. Test instrument
A sampling type opacity meter shall be used, and the technical requirements shall comply with the relevant provisions of Appendix G and Appendix H of GB3847-1999. B3 Test Procedure
B3.1 With the vehicle engine idling, insert the opacity meter sampling probe according to the requirements of Appendix H of GB3847-1999. B3.2 Quickly but not violently step on the accelerator pedal to allow the fuel injection pump to supply the maximum amount of fuel. Maintain this position before the engine reaches the maximum speed allowed by the governor. Once the maximum speed is reached, immediately release the accelerator pedal to return the engine to idle speed and the opacity meter to the corresponding 587
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