UN R78 Supplement 1 (04 series) · UNECE Regulation No. 78 (ECE R78) — Uniform provisions concerning the approval of vehicles of categories L1, L2, L3, L4 and L5 with regard to braking.
UN R78 — Supplement 1 to the 04 series of amendments
Base text → Supplement 1
- What changed
- New paragraph 5.1.17. gives the only conditions for generation and de-activation of the braking signal to illuminate stop lamp(s). Application of any service brake by the rider must generate it.
- Paragraph 5.1.17.2. covers vehicles powered solely by electric powertrain with electric regenerative braking that produces a retarding force upon release of the accelerator control. The signal must not be generated at 0.7 m/s² or less, may be generated up to 1.3 m/s², and must be generated above.
- New paragraphs 2.31. and 2.32. define “Braking Signal” and “Electric Regenerative Braking System”.
- Why
- The proposal aims to introduce activation of stop lamps under more conditions than the application of the service brake only, for example by regenerative braking.
- The deceleration criteria were taken from UN Regulation No. 13-H, paragraph 5.2.22.4., to provide consistent behaviour of stop lamp illumination as other road users.
Q1What changed8 changes
New definitions: Braking Signal and Electric Regenerative Braking System (paras. 2.31. and 2.32.)
New paragraph 2.31. defines “Braking Signal” as a logic signal indicating when illumination of the stop lamp is required or allowed as specified in paragraph 5.1.17. New paragraph 2.32. defines an “Electric Regenerative Braking System” as a braking system which converts vehicle kinetic energy into electrical energy during deceleration. It is not part of the service braking system.
Generation of the braking signal by the service brake (paras. 5.1.17. and 5.1.17.1.)
Paragraph 5.1.17. limits generation and de-activation of the braking signal to illuminate stop lamp(s) as defined in UN Regulation No. 53 to its conditions. Under paragraph 5.1.17.1., application of any service brake by the rider must generate a braking signal that will be used to illuminate the stop lamps.
Braking signal with electric regenerative braking (para. 5.1.17.2.)
Paragraph 5.1.17.2. adds provisions for vehicles powered solely by electric powertrain equipped with electric regenerative braking systems as defined in paragraph 2.32. The paragraph names such systems “which produces a retarding force upon release of the accelerator control”. At decelerations of 0.7 m/s² or less, the signal must not be generated. Above 0.7 m/s² and up to 1.3 m/s², it may be generated, and above 1.3 m/s² it must be generated. In all cases, the signal must be de-activated at the latest when the deceleration has fallen below 0.7 m/s². A new footnote says that compliance with this requirement must be confirmed by the vehicle manufacturer at the time of type approval.
Q2Why it changed
- Proposed by
- Expert from the International Motorcycle Manufacturers Association
- Working party
- GRVA, 2nd session (January–February 2019)
Reasons
The proposal aims to introduce activation of stop lamps under more conditions than the application of the service brake only, for example by regenerative braking.
Sources (2)
“The proposal aims to introduce activation of stop lamps under more conditions than the application of the service brake only (e.g. also by regenerative braking) into UN Regulation No. 78.”
“The expert from IMMA presented ECE/TRANS/WP.29/GRVA/2019/7, introducing revised provisions on the stop lamps activation under more conditions than the application of the service brake only (e.g. regenerative braking).”
At the time of the proposal, UN Regulation No. 53 allowed for the activation of the stop lamp by application of the brakes only. As presented at GRE, IMMA proposed to introduce activation of stop lamps under more conditions than the application of the service brake only.
Sources (2)
“UN Regulation No. 53 currently allows for the activation of the stop lamp by application of the brakes only.”
“As already presented at the Working Party on Lighting and Light-Signalling (GRE) (see ECE/TRANS/WP29/GRE/2018/25), IMMA is proposing to introduce activation of stop lamps under more conditions than the application of the service brake only”
The GRE report noted that the proposal might need to be accompanied by a modification of UN Regulation No. 78.
Source
“the proposal might need to be accompanied by a modification of UN Regulation No. 78 under GRRF.”
The deceleration criteria in paragraph 5.1.17.2. were taken from UN Regulation No. 13-H, paragraph 5.2.22.4. The aim is to provide consistent behaviour of stop lamp illumination as other road users.
Source
“The deceleration criteria in paragraph 5.1.17.2. were taken from the criteria established in UN Regulation No. 13-H, paragraph 5.2.22.4., to provide consistent behaviour of stop lamp illumination as other road users.”
Document trail
- —ProposalGRRF-86-35Earlier proposal by the expert from IMMA
- 2018-11RevisedECE/TRANS/WP.29/GRVA/2019/7Improved version of GRRF-86-35 by the expert from the International Motorcycle Manufacturers Association
- —Working party adoptsECE/TRANS/WP.29/GRVA/2GRVA session report, para. 55: GRVA adopted the proposal as amended in Annex VI
- 2019-04Sent to WP.29ECE/TRANS/WP.29/2019/46Text that GRVA adopted and 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.14.2020.TREATIES-XI.B.16.78UN depositary notification
Q3Who is affected
Vehicle manufacturer
- Make sure that application of any service brake by the rider generates a braking signal (para. 5.1.17.1.).
- If electric regenerative braking produces retarding force on accelerator release in a solely electric vehicle, meet the 5.1.17.2. table.
- Be ready to confirm compliance with the signal de-activation requirement at the time of type approval.
Component supplier
- If you supply the control that generates the braking signal, meet paragraphs 5.1.17.1. and 5.1.17.2.
Technical service / Approval authority
- Check that application of any service brake by the rider generates a braking signal (para. 5.1.17.1.).
- Be ready for the manufacturer's confirmation of the signal de-activation requirement at type approval.
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ⓘ This report gives advice only. It is not legal or type-approval advice.