The United Nations Economic Commission for Europe (UNECE) Regulation for the type-approval of braking systems, Regulation 13-H, sets out the technical requirements, test methods and limit values for the braking systems of all vehicles of category M1 and N1 (passenger cars and light commercial vehicles). The numbers of electric, hybrid and plug-in hybrid vehicles in production are rapidly increasing. In recent years, the braking regulation has been amended to incorporate provisions relating to regenerative braking systems, which are commonly fitted to such vehicles. The main aim of this study was to establish whether or not the existing regulatory requirements, test methods and limit values for regenerative braking systems could still be considered adequate in light of the first few years of experience with such systems and any development of new technology likely to be implemented in the foreseeable future. This involved a desktop study intended to identify the most likely issues, supplemented by a short programme of dynamic vehicle testing to further explore those issues and inform an assessment of the suitability of the current 13-H test procedures. This report describes the project methodology, results and conclusions in full. (Author/publisher)
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