Performance Test Results of a New On Board Emission Measurement System Conformed with CFR Part 1065 2007-01-1326

A new on-board portable emission measurement system (PEMS) for gaseous emissions has been designed and developed to meet CFR Part 1065 requirements. The new system consists of a heated flame ionization detector (HFID) for the measurement of total hydrocarbon, a heated chemiluminescence detector (HCLD) for the measurement of NOx, and a heated non-dispersive infra-red detector (HNDIR) for the measurement of CO and CO₂. The oxygen interference and relative sensitivity of several hydrocarbon components have been optimized for the HFID. The CO₂ and H₂O quenching effect on the HCLD have been compensated using measured CO₂ and H₂O concentration. The spectral overlap and molecular interaction of H₂O on the HNDIR measurement has also been compensated using an independent H₂O concentration measurement. The basic performance of the new on-board emission measurement system has been verified accordingly with CFR part 1065 and all of the performances have met with CFR part 1065 requirement. The new on-board emission measurement system has been also compared with conventional laboratory instrumentation. The results showed good correlation with that of a laboratory system.