UN R120 — Supplement 1 to the 02 series of amendments

Hydrogen is now item (g) in the list of reference fuels or fuel combinations in paragraph 5.2.3. Item (f) “Ethanol” now ends with “;” instead of “.”. New paragraph 3.3. of Annex 7 gives a table for the hydrogen reference fuel, with limits for the hydrogen fuel index and for non-hydrogen gases. The table gives values such as 99.97 % for the hydrogen fuel index and 300 μmol/mol for total non-hydrogen gases. Under note 5 to the table, the test method must be documented, and test methods defined in ISO21087 are preferable. Under note 6, the manufacturer must give the approval authority reasons for exempting specific contaminants.

In Annex 1, Appendix A1, paragraphs 2.8.1. and 3.14.1. now list hydrogen, and so does paragraph 2.8.1. of Annex 2. In Annex 5, hydrogen is now item (g) of the fuel type list in paragraph 2.3.6. In the test report of Annex 2, Appendix A.1, new paragraphs 4.5. to 4.5.3. add the entries “Gaseous fuel - Hydrogen”, “Make”, “Type” and “Grade”. The entries for the dual-fuel engine and the gas energy ratio are now numbered 4.6. and 4.6.1. instead of 4.5. and 4.5.1.

New paragraph 5.4.2.1.3. applies when a turbocharged engine is fitted with a system which allows compensating the ambient conditions temperature and altitude. In this case, at the request of the manufacturer, the correction factor αa or αd must be set to the value of 1.

Paragraph 5.2.1. now lists the run at fixed full load fuel-injection-pump setting for mechanically controlled compression ignition engines as a separate item (b). Before, item (a) gave this run together with the run at full throttle for mechanically controlled positive ignition engines. The run for electronically controlled engines is now item (c) instead of (b). The words “consist of either” now end with “:”. In Annex 4, paragraph 3.10. now reads “assembly” instead of “assemby”.