New Approaches to Vehicle Emissions Inspections – Part 2Daniele D'Onofrio
In this second PTI test webinar sponsored by 3DATX and supported by CITA, the vehicle emissions database was expanded to over 160 vehicles, a four-fold increase since the first webinar in February 2021. During this new webinar, an updated test protocol was presented, as well as preliminary NOx thresholds for the stationary and dynamic tests, and a comparison of CO and NP between the improved test and the standard PTI test was made.
In detail, this update included:
- A proposed enhanced PTI test protocol for gaseous and particulate emissions from gasoline and diesel fueled vehicles. In this enhanced protocol, the emission tests are performed in 70% less time than the protocol presented in the first webinar.
- A preliminary threshold for nitrogen oxides (NOx as NO + NO2) emissions to identify malfunctioning or tampered emissions aftertreatment devices. Three types of emissions thresholds are discussed – normal idle, stationary high RPM, and short driving acceleration – and based on which tests are permitted in a country, one or more metric could be used.
- A comparison of carbon monoxide (CO) and particle number (PN) results from the enhanced PTI protocol with the current PTI based CO and smoke opacity data, respectively.