What does it cover?
The UN R177 working text addresses system power of hybrid vehicles and pure electric vehicles with more than one propulsion energy converter. M1 and N1 form the main scope; fuel cell vehicles are excluded. In a hybrid, electric-machine contribution at maximum power is relevant.
Who is it for?
For vehicle, engine and powertrain manufacturers and measurement, testing and approval teams.
Which subjects are addressed?
- Hybrid and multi-motor electric propulsion
- System power measurement
- M1/N1 scope and exclusions
Common question
Does adding separate motor ratings give system power?
R177 treats vehicle system power through a defined measurement method. Adding individual motor ratings is not a test result obtained using that method.
Published RegsUP edition
This page is tied to the published RegsUP working edition below; it is not an official consolidated text.
RegsUP record title: R177 — UN Regulation No. 177
Working series: 01 · Included supplement: 1
RegsUP edition publication date:
This is the RegsUP publication decision date, not the date the regulation entered into force.