This Standard specifies Motor vehicles-windshield demisting and defrosting systems performance requirements and test methods.
This Standard is applicable to 180°forward range of visibility of the driver for M1vehicles.
2 Normative References
Provisions of the following documents, through reference in this standard, constitute provisions of this standard. For dated reference, subsequent amendments to, or revisions of, any of these publications do not apply parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. For undated references, the latest edition of the normative document is applicable.
GB 11551-2003 the Protection of the Occupant in the Event of a Frontal Collision for Passenger Car
GB 11562-1994 Motor Vehicles - Forward Visibility for Drivers-Requirements and Measurement Methods
3 Terms and Definitions
The following terms and definitions are applicable to this standard.
3.1 Defrosting system
The system that thaws the frost or ice on the windshield so that visibility is resumed.
3.2 Defrosting
Removal of the frost or ice on the windshield through defrosting or operation of the windscreen wiper.
3.3 Defrosted area
The area of the windshield that is dry or completely or partially thawed and covered by damp frost on the surface, the frost may be removed by windscreen wiper from the outside. The defrosting area does not include the area of the windshield that is covered by dry frost.
3.4 Demisting system
The system employed to remove the cold condensation from the windshield so that normal visibility is restored.
3.5 Misting
The condensation on the interior surface of the windshield glasses.
3.6 Demisting
Removal of the mist covering the interior surface of the windshield glasses through the operation of demisting system.
3.7 Demisting area
The area of the interior surface of the windshield glasses that resumes visibility after demisting.
3.8 Points V
Points V are the points indicating driver’s eye positions. It is determined by the longitudinal vertical planes of the center line of the driver’s seating position (if the seat is adjustable, adjust the seat to the furthest back), Point R and seat backrest angel design (see Article 3.4.1 of GB 11562-1994). Points V are employed to check if the range of visibility meets the requirements. V1 and V2 are usually used to indicate the different positions of Points of Points V (see Figure 1).
3.9 Point R
“Point R ” is “seating reference point”. Its definition is as per Section 3.7 in GB 11551-2003.
