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| Document Title | UN R78: Proposal for amendments | ||||||||
| Reference Number | GRRF-86-35 | ||||||||
| Date |
15 Feb 2018
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| Summary | Updated version of document GRRF/2017/14 to amend UN R78 with regard to stop lamp activation. IMMA has proposed (document GRE/2015/42) to allow stop lamp activation under UN R53 through means other than application of the brakes (e.g., by electric vehicle regenerative braking). This proposal accordingly amends UN R78 regarding generation of the brake signal. | ||||||||
| Source(s) | IMMA | ||||||||
| Rulemaking Area(s) | UN R78 Motorcycle Braking | ||||||||
| Proposal Status | Superseded | ||||||||
| Meeting(s) | |||||||||
| Related Documents | |||||||||
| GRRF/2017/14 | Proposal for amendments to the 04 series of amendments to Regulation No. 78 (superseded) | ||||||||
| GRRF-84-13 | Proposal for amendments to GRRF/2017/14 (UN R78) (superseded) | ||||||||
| GRVA-01-42 | UN R78: Proposal for amendments (superseded) | ||||||||
| Downloads | |||||||||
| UNECE server | .pdf format | .docx format | |||||||
| Excerpts from session reports related to this document | |||||||||
| GRRF | Session 86 | 12-16 Feb 2018 |
22. The expert from IMMA introduced GRRF-86-35 with provisions allowing additional conditions for the activation of the stop lamp. The proposal received some comments. GRRF noted that some conditions were related to regenerative braking and, therefore, GRRF recommended to explore corresponding provisions in UN Regulations Nos. 13 and 13-H on the braking performance of regenerative braking and to complement the proposal for amendments to UN Regulation No. 78 with corresponding provision, not only addressing brake light activation requirements. GRRF noted the potential need to clarify the need of the word “instantaneous” in para. 5.1.16. The expert from IMMA agreed to submit a revised proposal for the September 2018 session of GRRF. |
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NL opposes--UN R13-H gives 0.7 m/s<sub>2</sub> threshold and specifically wanted to avoid brake lamp illumination just from slowing by engine retardation. UK agrees that proposal should use R13-H specifications. Canada concurs, adding that frequent lamp activation would dilute significance of stop lamp. Frost adds concerns from regen braking discussion earlier in the week. Decision took into account interest in harvesting kinetic energy, but specifically looked at relation with service brake such that cat A and cat B regen braking systems. Recommends aligning with R13-H provisions. Regen used for energy purposes should only send brake signal at high deceleration to avoid confusion with engine braking.
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