Differences between the January 8 version and the previous December 21, 2015 version.

Status of the draft regulation on retrofit dual fuel systems for heavy-duty vehicles anticipated for submission to the June GRPE session.

Discussion of CO₂ and O₂ used methods for emissions performance measurement.

This document is a draft proposal of a new regulation prepared by the GFV informal working group to enable type approval of dual-fuel retrofit systems to be installed on already approved and in service heavy duty diesel engines and vehicles. GFV intends to submit a working document for the 73rd session of GRPE.

Proposal for a new regulation to enable type approval of dual-fuel retrofit systems to be installed on already approved and in service heavy duty diesel engines and vehicles.

Proposal for amendments to document GRPE/2016/12 for consideration by the GFV informal group and submission to GRPE for consideration of the proposal for a new regulation during its June 2016 session.

Revised version of the proposal for a new regulation concerning dual-fuel retrofit systems (document GPRE/2016/12) incorporating and highlighting the amendments and corrections presented in document GFV-45-02.

The latest amendments to the formal proposal GRPE/2016/12 as agreed within the informal group on Gaseous Fueled Vehicles (GFV).

Amendments to the proposal as presented in document GRPE/2016/12.

Presentation on the background and accomplishments of the GFV informal group from January 2008 to June 2016 as the group concludes its final effort on heavy-duty dual fuel engine retrofit systems.

Version 3 as of 8 June 2016.

Presentation made to the GRPE June session (as document GRPE-73-29). Presentation on the background and accomplishments of the GFV informal group from January 2008 to June 2016 as the group concludes its final effort on heavy-duty dual fuel engine retrofit systems.

Proposal for a new Regulation on uniform provisions concerning the approval of Heavy Duty Dual-Fuel Engine Retrofit Systems (HDDF-ERS) to be installed on heavy duty diesel engines and vehicles. Please note that Japan notified the UN Secretary-General on 1 February 2017 of its intention not to apply this regulation from the date it enters into effect (June 2017). Japan remains free to adopt the regulation at a later date.

During the June 2016 GRPE session, AEGPL raised concerns regarding the back-to-back approach for the simplified test of retrofitted dual-fuel engines because, in some cases, the hydrocarbons (HC) and/or carbon monoxide (CO) emission values of the original diesel engine are far below the emission limit (see GRPE-73 session report, para. 28). AEGPL proposed a solution in document GRPE-73-07. However the Netherlands is concerned that:

1. The emission performance of the selected diesel engine is not known (above or below the emission limit and how far from the limit);
2. Non-methane hydrocarbons (NMHC) emission cannot be disregarded because NMHC is an important air quality regulated pollutant emission; and
3. The diesel emissions of CO and HC could be far below the emission limit and hence a factor of two would not be sufficient while increasing this factor is problematic.

Contracting Parties and stakeholders have discussed a solution, presented in this proposal, to compare measured emissions of a retrofitted dual-fuel engine with the brake specific emission limits using a CO2 specific emissions approach. This proposal would amend the draft regulation pending before WP.29 (document WP.29/2016/110).