GB/T 24552-2009Electric vehicles - Windscreen demisting and defrosting systems - Performance requirements and test methods (English PDF)

Foreword

This Standard was proposed by National Development and Reform Commission. This Standard shall be administrated by National Automotive Standardization Technical Committee. Drafting organization of this Standard. China Automotive Technology and Research Center. The main drafters of this Standard. He Yuntang, and Zhao Jingwei. Electric vehicles - Windshield demisters and defrosters systems - Performance requirements and test methods

1 Scope

China's national performance requirements and test methods for the windscreen demisting and defrosting systems of electric vehicles. It specifies the requirements and the test procedures for clearing frost and mist from the windscreen of an electric vehicle. Demisting and defrosting are safety requirements on every vehicle - a driver who cannot see out is the hazard - and the general automotive standard has existed for decades. Electric vehicles need their own because the heat has to come from somewhere else. A combustion engine rejects roughly two thirds of its fuel energy as heat, and a conventional car defrosts its windscreen with waste heat it would otherwise throw away; the demister costs nothing but a fan. An electric vehicle has no waste heat worth the name. Clearing a frozen windscreen requires several kilowatts, and that energy comes from the traction battery - the same battery that provides the range, in the same cold weather that has already reduced its capacity. So the demister is one of the largest auxiliary loads on the vehicle and it appears exactly when range is shortest. The consequence is a real temptation to under-specify it, and this standard exists so that the safety requirement is met regardless of the energy cost. It fixes the test conditions - the soak temperature and duration, the frost or mist applied and how it is produced, the vehicle state and the settings - the areas of the windscreen that must be cleared and the proportion of each, the times within which they must be cleared, and the measurement of the cleared area. Issued on 30 October 2009 and in force since 1 July 2010.

This Standard specifies performance requirements and test methods of electric vehicles' windshield demisters and defrosters systems. This Standard applies to the Class M1 pure electric vehicles which use power batteries as power source and which use demisters and defrosters systems.

2 Normative references

The provisions in following documents become the provisions of this Standard through reference in this Standard. For dated references, the subsequent amendments (excluding corrections) or revisions do not apply to this Standard, however, parties who reach an agreement based on this Standard are encouraged to study if the latest versions of these documents are applicable. For undated references, the latest edition of the referenced document applies.

GB 11555 Passenger cars - Windshield demisters - Performance requirements

GB 11556 Passenger cars - Windshield defrosters - Performance requirements

GB/T 19596-2004 Terminology of electric vehicles

3 Terms and Definitions

The established terms and definitions in GB 11555 and GB 11556 apply to this Standard.

4 Performance Requirements

Every electric vehicle shall be equipped with a set of defroster system and a set of demister system.