UN R115 Supplement 8 (00 series) · UNECE Regulation No. 115 (ECE R115) — Uniform provisions concerning the approval of: I. Specific LPG (liquefied petroleum gases) retrofit systems to be installed in motor vehicles for the use of LPG in their propulsion systems II. Specific CNG (compressed natural gas) retrofit systems to be installed in motor vehicles for the use of CNG in their propulsion systems.
UN R115 — Supplement 8 to the 00 series of amendments
Supplement 7 → 8
- What changed
- New paragraphs 2.8. and 2.9. define the NEDC and WLTC test cycles.
- The test cycle (NEDC or WLTC) is chosen according to the initial type approval of the vehicle.
- With WLTC, the tests are done two times and may be reduced to one test if each pollutant result is at most 0.90 G.
- Why
- The amendment adds provisions for retrofit systems on vehicles first tested with WLTC according to UN GTR No. 15.
- The modified vehicle should fulfil the provisions under which it was first approved, so the test cycle follows that approval.
- The dCO2 coefficient of UN GTR No. 15 does not suit LPG and CNG, so the number of WLTC tests has its own rule.
Q1What changed71 changes
Definitions of NEDC and WLTC (paras. 2.8. and 2.9.)
New paragraph 2.8. defines “NEDC” as the cold start exhaust emission test cycle of UN Regulation No. 83 up to 07 series of amendments. New paragraph 2.9. defines “WLTC” as the Worldwide harmonized Light vehicles Test Cycle of UN GTR No. 15. A RegVault Note explains that the amendment names paragraphs 2.6. and 2.7. but quotes paragraphs 2.8. and 2.9.
Test procedures and calculations with UN GTR No. 15
Paragraphs 6.1.2.1. and 6.2.2.1. add the test procedures of UN GTR No. 15 for the retrofit system sample. The emissions of CO, HC and NOx are calculated according to UN Regulation No. 83 or to UN GTR No. 15, as applicable. The emissions of CO2 are calculated according to UN Regulation No. 101 or to UN GTR No. 15, as applicable. The footnote on the series of amendments of Regulation No. 49 at the initial type approval of the engine is deleted.
Choice of test cycle and NEDC tests
The test cycle (NEDC or WLTC) is chosen according to the initial type approval of the vehicle. For the NEDC cycle, the tests are undertaken three times with reference petrol and three times with each reference LPG or CNG. The table values of paragraphs 6.1.2.4.1.2.2. and 6.2.2.4.1.2.2. are used only for the NEDC cycle. Paragraphs 6.1.2.4.1.4. and 6.2.2.4.1.4. get the new numbers 6.1.2.4.1.4.1. and 6.2.2.4.1.4.1.
Number of WLTC tests
For the WLTC cycle, the tests are undertaken two times with reference petrol and two times with each reference LPG or CNG. With reference petrol, the tests may be reduced to one test if each pollutant result is less than or equal to 0.90 G. With each reference LPG or CNG, this reduction also applies to the combined emission of two pollutants. G is the limit value according to the type approval of the vehicle, divided by the deterioration factors.
Period of petrol use during each test
The 60-second limit on petrol use applies to vehicles that comply with up to 07 series of amendments to UN Regulation No. 83. It also applies to vehicles that comply with the 05 or following series of amendments to UN Regulation No. 49. The text no longer refers to later amending Directives or European Regulations. For vehicles approved with the WLTC cycle, this period is predetermined and the driver cannot change it.
FCnorm in the energy ratio calculations (Annexes 6A and 6B)
FCnorm now follows Annex 6 to UN Regulation No. 101 or paragraph 6 of Annex 7 to UN GTR No. 15, as applicable. Before this supplement, only Annex 6 to Regulation No. 101 applied.
Q2Why it changed
- Proposed by
- Expert from Italy
- Working party
- GRPE, 78th session (January 2019)
Reasons
The amendment adds provisions for the type approval of retrofit systems for vehicles first tested with WLTC according to UN GTR No. 15.
Source
“This proposal amends UN Regulation No. 115 introducing the provisions regarding the type approvals of retrofit systems for vehicles originally tested with WLTC according to UN GTR No. 15.”
The definitions of NEDC and WLTC make the text easier to read. The old provisions refer to NEDC vehicles, and the new provisions refer to WLTC vehicles.
Sources (2)
“To improve the readability of the text, this proposal introduces the definitions of NEDC and WLTC test cycles”
“The provisions of Regulation 115 before the present amendment refer to vehicles approved according to NEDC test cycle, while the new provisions included in this amendment refer to vehicles approved according to WLTC test cycle.”
The modified vehicle should fulfil all provisions under which it was first approved. So the type I test paragraphs are duplicated for NEDC and WLTC, and the cycle follows the initial type approval.
Sources (2)
“is that the modified vehicle should fulfil all the provisions of the Regulation for which the type approval has initially been granted.”
“Therefore this amendment simply duplicates the paragraphs related to type I test, including both NEDC and WLTC provisions.”
The WLTC test procedure follows UN GTR No. 15 with minimum adaptations for retrofit systems. So the text adds references to these texts, as applicable.
Sources (2)
“This amendment refer to WLTC test procedure, as defined in UN GTR No. 15 with minimum adaptations due to the context of retrofit systems.”
“The text of amendment therefore introduces the references to the above mentioned Regulations, as applicable.”
The only WLTC adaptation is the number of tests. LPG and CNG give 8% to 20% less CO2 than petrol. So the dCO2 coefficient of UN GTR No. 15 is always satisfied and does not suit them.
Sources (2)
“The only adaptation in the WLTC test procedure regards the number of repetitions.”
“This because LPG and CNG fuel CO2 figures are smaller than petrol CO2 from 8% to 20%, making the dCO2 coefficient specified in UN GTR No. 15 inappropriate, because always satisfied.”
Document trail
- 2018-10ProposalECE/TRANS/WP.29/GRPE/2019/3Proposal by Italy
- —Working party adoptsECE/TRANS/WP.29/GRPE/78Session report, paras. 33 and 34
- 2019-04Sent to WP.29ECE/TRANS/WP.29/2019/45Text that GRPE sent to WP.29 and AC.1
- 2019-06WP.29 adoptsECE/TRANS/WP.29/1147Adopted at the 178th session (session report, para. 134)
- 2020-01-11In forceUN depositary notification
Q3Who is affected
Vehicle manufacturer
- Choose the test cycle, NEDC or WLTC, according to the initial type approval of the vehicle.
- For WLTC vehicles, do the tests two times with reference petrol and with each reference LPG or CNG.
- For WLTC vehicles, make sure that the period of petrol use is predetermined and the driver cannot change it.
Component supplier
- No direct action for this role.
Technical service / Approval authority
- Use the table values of paragraph 6.1.2.4.1.2.2. or 6.2.2.4.1.2.2. only for the NEDC cycle.
- Calculate CO, HC and NOx emissions with UN Regulation No. 83 or UN GTR No. 15, as applicable.
- Calculate CO2 emissions with UN Regulation No. 101 or UN GTR No. 15, as applicable.
- For FCnorm in Annexes 6A and 6B, accept paragraph 6 of Annex 7 to UN GTR No. 15, as applicable.
See every change side by side
RegVault customers compare every version of UN regulations, read the consolidated text and download the PDF.
ⓘ This report gives advice only. It is not legal or type-approval advice.