Document ID: chunk:federal_register_of_legislation:F2024L00447:reg:0:p15
Version: federal_register_of_legislation:F2024L00447
Segment Type: reg
Provision Reference: reg 0 (pt 15/57)
Character Range: 133040–135847

(i.e. unintentional stopping of the engine) should be avoided during an RDE trip. Any warning signals, suggesting malfunctioning of the PEMS, shall be documented and verified. If any error signal(s) appear during the test, the test shall be invalid. Parameter recording shall reach a data completeness of higher than 99 per cent. Measurement and data recording may be interrupted for less than 1 per cent of the total trip duration but for no more than a consecutive period of 30 s solely in the case of unintended signal loss or for the purpose of PEMS system maintenance. Interruptions may be recorded directly by the PEMS but it is not permissible to introduce interruptions in the recorded parameter via the pre-processing, exchange or post-processing of data. If conducted, auto zeroing shall be performed against a traceable zero standard similar to the one used to zero the analyser. It is strongly recommended to initiate PEMS system maintenance during periods of zero vehicle speed.

              5.3. Test end

              Excessive idling of the engine after the completion of the trip shall be avoided. The data recording shall continue after the test end (as defined in paragraph 3.8.6. of this Regulation) and until the response time of the sampling systems has elapsed. For vehicles with a signal detecting regeneration, the OBD-check shall be performed and documented directly after data recording and before any further driven distance is driven.

              6. Post-test procedure

              6.1. Checking the analysers for measuring gaseous emissions

              The zero and span of the analysers of gaseous components shall be checked by using calibration gases identical to the ones applied under paragraph 4.5. to evaluate the analyser's zero and response drift compared to the pre-test calibration. It is permissible to zero the analyser prior to verifying the span drift, if the zero drift was determined to be within the permissible range. The post-test drift check shall be completed as soon as possible after the test and before the PEMS, or individual analysers or sensors, are turned off or have switched into a non-operating mode. The difference between the pre-test and post-test results shall comply with the requirements specified in Table A4/2.

    Table A4/2
    Permissible analyser drift over a PEMS test

Pollutant  Absolute Zero response drift  Absolute Span response drift[13]

CO2        ≤ 2000 ppm per test           ≤ 2 % of reading or ≤ 2000 ppm per test, whichever is larger

CO         ≤ 75 ppm per test             ≤ 2 % of reading or ≤ 75 ppm per test, whichever is larger

NOX        ≤ 3 ppm per test              ≤ 2 % of reading or ≤ 3 ppm per test, whichever is larger

CH4        ≤ 10 ppm C1 per test          ≤ 2 % of reading or ≤ 10 ppm