Abstract
For the requirements of the portable emission measurement system (PEMS) measurement accuracy for limits and measurement methods for emissions from light-duty vehicles(CHINA 6), based on the light-duty vehicle emission test system in steady-state conditions and WLTC conditions for PEMS gaseous pollutants, mass flow rate , particle number (PN) verify accuracy of measurement. The results showed that the relative measurement errors of CO, CO2, NOx, fuel consumption and mass flow rate were −5.49%, 2.53%, 10.55%, 2.09% and −2.79%. The relative measurement errors of CO, CO2, NOx, fuel consumption and PN under WLTC condition were 6.67%, 2.54%, 12.96%, 2.37% and −16.08%, which meeting the requirements of the regulations.
Highlights
A large number of relevant studies at home and abroad have shown that laboratory emission test results cannot truly reflect the level of pollutant emissions during actual vehicle driving
In 2005, the US Federal Environmental Protection Agency issued regulations requiring the use of portable on-board emission measurement system (PEMS) for heavy-duty diesel vehicles (HDV) gaseous pollutants for actual road testing and NTE analysis methods for emissions analysis [7]
The PEMS and MEXA-7400DTR sample probes were connected in the same way and at steady-state conditions as in the gas comparison test between the PEMS and MEXA-7400TR direct gas analyzers
Summary
A large number of relevant studies at home and abroad have shown that laboratory emission test results cannot truly reflect the level of pollutant emissions during actual vehicle driving. In order to truly reflect the pollutant emission level of vehicles during actual driving, countries have successively applied PEMS to the actual road emission testing process [5,6]. The United States and Europe have successively applied PEMS to check the consistency of heavy-duty diesel vehicles (HDV) and non-road machinery in use. China has gradually applied the PEMS test method to the LDV, HDV, and non-road mobile machinery actual driving pollutant emission testing process [9,10,11].
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