UN R85 Supplement 13 (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 13 to the 00 series of amendments
Supplement 12 → 13
- What changed
- New text in Annex 6, Table 1 says: “In the case that the liquid-cooling pumps are electrically driven, an external circuit including pump, radiator and thermostat in relative positions which differ from those in the vehicle can be used provided that the pressure loss of this circuit and/or the volume flow of the pump remain substantially the same as those of the drive train cooling system of the intended application”.
- In Table 1, the pump and the thermostat now carry note mark 1, and the fan now carries note mark 2 instead of the radiator.
- Why
- The proposal aims to clarify and update the requirements for fitment of auxiliaries in net power or 30 minutes power tests of electric drive trains.
- If electric drive trains use electric pumps for cooling liquid and control temperatures through pump control rather than with a conventional thermostat, “it appears no longer necessary that the pump and thermostat are located on the test bench in the same relative position as on the vehicle”.
Q1What changed2 changes
Liquid-cooling auxiliaries for electric drive trains (Annex 6, Table 1)
Annex 6, Table 1 now includes this text: “In the case that the liquid-cooling pumps are electrically driven, an external circuit including pump, radiator and thermostat in relative positions which differ from those in the vehicle can be used provided that the pressure loss of this circuit and/or the volume flow of the pump remain substantially the same as those of the drive train cooling system of the intended application”. The note marked 1 in the table says: “The radiator, the fan, the fan cowl, the water pump and the thermostat shall be located on the test bench in the same relative position as on the vehicle”. The pump now carries note mark 1. The thermostat now carries note marks 1 and 3; before, it carried note mark 3. Note mark 2 is now on the fan instead of the radiator. The note marked 2 says: “Where a disconnectable or progressive fan or blower is incorporated, the test should be carried out with the disconnectable fan (or blower) disconnected or at maximum slip condition”.
Q2Why it changed
- Proposed by
- Expert from the International Organization of Motor Vehicle Manufacturers
- Working party
- GRPE, 90th session (January 2024)
Reasons
The proposal aims to clarify and update the requirements for fitment of auxiliaries in net power or 30 minutes power tests of electric drive trains.
Sources (2)
“This document aims at clarifying and bringing up to date the requirements for fitment of auxiliaries when testing the net power or 30 minutes power of electric drive trains.”
“to clarify and bring up to date the requirements for fitment of auxiliaries when testing the net power or 30 minutes power of electric drive trains”
It is common practice with electric drive trains to use electric pumps for cooling liquid. It is also common practice to control temperatures through pump control rather than with a conventional thermostat. In this case, “it appears no longer necessary that the pump and thermostat are located on the test bench in the same relative position as on the vehicle”.
Sources (2)
“It is common practice with electric drive trains to employ electric pumps for cooling liquid and to control temperatures via pump control rather than with a conventional thermostat.”
“In this case it appears no longer necessary that the pump and thermostat are located on the test bench in the same relative position as on the vehicle.”
Document trail
- 2023-10ProposalECE/TRANS/WP.29/GRPE/2024/15Proposal by the expert from the International Organization of Motor Vehicle Manufacturers
- —Working party adoptsECE/TRANS/WP.29/GRPE/90GRPE session report, para. 47
- 2024-04Sent to WP.29ECE/TRANS/WP.29/2024/51Text that GRPE sent to WP.29 and AC.1
- 2024-06WP.29 adoptsECE/TRANS/WP.29/1179Adopted at the 193rd session (session report, para. 162)
- 2025-01-10In forceC.N.51.2025.TREATIES-XI.B.16.85UN depositary notification
Q3Who is affected
Vehicle manufacturer
- No direct action for this role.
Component supplier
- No direct action for this role.
Technical service / Approval authority
- No direct action for this role.
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.