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UN R49: Proposal for Supplement 6 to the 06 series of amendments
Document WP.29/2018/47
5 April 2018

Proposal to improve the Engine Control Unit (ECU) torque signal validation requirement in the 06 series of amendments to R49 with regard to dual-fuel or flex-fuel vehicles. Under the regulation, the ECU torque information can be calibrated only to one fuel’s heat value (usually the basic reference fuel) even though the heat value of the alternative fuel is different. In order to increase the accuracy of the torque values used for calculating the emission results during in-service conformity testing, OICA proposes to change the provisions to either:

  1. Demonstrate that both fuels comply because the ODB system is able to detect the fuel used, or
  2. Determine the torque deviation caused by the alternative fuel heat value compared to the standard fuel and apply this correction factor to calculate a more accurate power signal for the emission calculation.

Status: Adopted
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Previous Documents, Discussions, and Outcomes
4.7.1. | Proposal for Supplement 10 to the 05 series of amendments to UN Regulation No. 49 (Compression ignition and positive ignition (LPG and CNG) engines))
4.7.2. | Proposal for Supplement 6 to the 06 series of amendments to UN Regulation No. 49 (Compression ignition and positive ignition (LPG and CNG) engines))
4. (a) | Heavy duty vehicles: Regulations Nos. 49 and 132

23. The expert from OICA also presented ECE/TRANS/WP.29/GRPE/2018/10 with requirements on Engine Control Unit torque signal validation, random check and rounding of test results. The expert from EC proposed clarifications (GRPE-76-16). GRPE adopted the proposal as amended and reproduced in Annex VI and requested the secretariat to submit it to WP.29 and AC.1 for consideration and vote at their June 2018 sessions as draft Supplement 6 to the 06 of amendments to UN Regulation No. 49.

Related and Previous Documents
GRPE/2018/10
GRPE-76-16
Relates to UN R49 |