Figure 11 Sample Clauses

Figure 11. Span drift results for PEMS type 1 ND-IR based CO₂ and CO analysers and ND-UV based NO, NO₂ and NOₓ from 28 PEMS tests. Three PEMS devices in total were tested in laboratory conditions using a chassis dynamometer and a CVS system. The deviations for the two PEMS types compared to CVS results are shown in Table 3. Any cells marked in yellow exceed the permissible tolerances of Euro 6e regulation. Additionally, values marked in red exceed the permissible tolerances defined in the RDE4 regulation. The general observations obtained from the PEMS validations in laboratory conditions are: • When working as designed, the performance of the current commercial PEMS devices was typically well within the permissible tolerances defined in the RDE4 and Euro 6e regulation. • For PEMS devices used in this work, the ageing effects affected the device performance case by case. E.g., not all ND-IR units face identical problems. • Type 1 PEMS ND-IR and ND-UV units were found robust throughout the three-year period, meanwhile type 2 ND-IR suffered from issues with a pre-used device as seen in Table . The ND-IR for the goldenPEMS (type 2 based PEMS) was however satisfactory. • PN PEMS response varied greatly depending on the vehicle exhaust emissions. o The tested ADC faced challenges with permissible deviation when the test object produces PN emissions close to the emission limit. Diesel Aged 2021 124.1 11 19 1.0E+09