UN R85 Supplement 9 (00 series) · UNECE Regulation No. 85 (ECE R85) — Uniform provisions concerning the approval of internal combustion engines or electric drive trains intended for the propulsion of motor vehicles of categories M and N with regard to the measurement of the net power and the maximum 30 minutes power of electric drive trains.
UN R85 — Supplement 9 to the 00 series of amendments
Supplement 8 → 9
- What changed
- In Annex 5, Table 1, footnote 1b, the case "two-stroke and positive-ignition engines" now reads "two-stroke engines".
- Why
- The proposal said the earlier wording may be interpreted to mean that a positive ignition engine's exhaust system cannot be modified in any way.
- The expert from OICA proposed to amend the wording of the description of auxiliaries to be fitted for testing, to reduce potential testing burden.
Q1What changed2 changes
Cases where the complete exhaust system is fitted (Annex 5, Table 1, footnote 1b)
Footnote 1b now says that, in the following cases, the complete exhaust system must be fitted as provided for the intended application. The engine case now reads "In the case of two-stroke engines"; before, it read "In the case of two-stroke and positive-ignition engines". The other cases are a risk of an appreciable effect on the engine power, and when the manufacturer requests it. In other cases, an equivalent system may be installed, with a pressure limit at the exit of the engine exhaust system. This pressure must not differ by more than 1,000 Pa from that specified by the manufacturer.
Q2Why it changed
- Proposed by
- Expert from the International Organization of Motor Vehicle Manufacturers
- Working party
- GRPE, 78th session (January 2019)
Reasons
The proposal said the earlier wording may be interpreted to mean that a positive ignition engine's exhaust system cannot be modified in any way. This can cause problems when the engine and exhaust are installed in the test cell. It also prevents coverage of small differences with a single approval test (family concept). The final two sentences of the footnote give sufficient assurance that the exhaust system used is representative, as with compression ignition engines.
Sources (3)
“The existing wording may be interpreted to mean that the exhaust system for a positive ignition engine cannot be modified in any way.”
“This can cause problems when installing the engine and exhaust in the test cell and prevents coverage of small differences with a single approval test (family concept).”
“The final 2 sentences of the footnote provide sufficient assurance that the exhaust system used is representative (as with compression ignition engines)”
The expert from OICA proposed to amend the wording of the description of auxiliaries to be fitted for testing, to reduce potential testing burden.
Sources (2)
“The expert from OICA presented ECE/TRANS/WP.29/GRPE/2019/7 proposing to amend, in UN Regulation No. 85, the wording of the description of auxiliaries to be fitted for testing to reduce potential testing burden.”
“This document proposes to amend the wording of the description of auxiliaries to be fitted for testing in order to reduce potential testing burden.”
Document trail
- 2018-10ProposalECE/TRANS/WP.29/GRPE/2019/7Proposal prepared by the expert from the International Organization of Motor Vehicle Manufacturers (OICA)
- —Working party adoptsECE/TRANS/WP.29/GRPE/78Session report, paras 38 and 39: GRPE adopted ECE/TRANS/WP.29/GRPE/2019/7 as amended by Annex IX and asked the secretariat to submit Annex IX to WP.29 and AC.1
- 2019-04Sent to WP.29ECE/TRANS/WP.29/2019/44Text 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 forceC.N.18.2020.TREATIES-XI.B.16.85UN depositary notification
Q3Who is affected
Vehicle manufacturer
- Keep an equivalent exhaust system (positive-ignition, no footnote 1b case) within 1,000 Pa of your specified exit pressure.
Component supplier
- No direct action for this role.
Technical service / Approval authority
- Be ready for positive-ignition engines tested with an equivalent exhaust system where no footnote 1b case applies.
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ⓘ This report gives advice only. It is not legal or type-approval advice.