GB 11555-2009 English PDF (GB11555-2009)

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GB 11555-2009: Motor vehicles-windshield demisting and defrosting systems -- Performance requirements and test methods
GB 11555-2009
GB
ICS 43.040.60
T 26
NATIONAL STANDARD
OF THE PEOPLE'S REPUBLIC OF CHINA
Replacing GB 11555-1994, GB 11556-1994
Motor vehicles-windshield demisting and
defrosting systems -
Performance requirements and test methods
ISSUED ON. SEPTEMBER 30, 2009
IMPLEMENTED ON. JANUARY 1, 2011
Jointly issued by. General Administration of Quality Supervision, Inspection
and Quarantine;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3 
1. Scope ... 5 
2. Normative references ... 5 
3. Terms and definitions ... 5 
4. Determination of A, B and A’ areas ... 6 
5. Requirements ... 8 
6. Test method ... 8 
Appendix A ... 14 
Foreword
All technical contents of this standard are mandatory.
This standard modifies and adopts EU 78/317/EEC (21/12/1977) 0J NO. L81 (28/03/1978)
“Council Directive on the approximation of the laws of the Member States relating to the
defrosting and demisting systems of glazed surfaces of motor vehicles” (English version).
This standard replaces GB11555-1994 “Motor vehicle windshield demisting system
performance requirements and test methods” and GB11556-1994 “Motor vehicle windshield
defrosting system performance requirements and test methods”.
This standard was re-drafted according to 78/317/EEC. Appendix A lists out the correlation
on the chapter and section numbering between this standard and that in the 78/317/EEC.
Considering to the actual situations in China, when adopting 78/317/EEC directive, this
standard has made some modifications.
The technical differences and the reasons between this standard and 78/317/EEC directive
are as follows.
— Delete the content relating to certification in 78/317/EEC directive. That is, Chapter 3,
4 of Appendix 1 and Appendix 6. This is because there is formatting difference
between the standard system and directive system.
— Delete “2.3 three-dimensional coordinate system”, “2.4 basic reference marking”, “2.5
seat back angle”, “2.6 actual seat back angle” in Appendix 1 of 78/317/EEC directive;
the definition of “designed seat back angle”; “determining of H point and actual seat
back angle, verification of relative location between point R and H, and the relation
verification procedure between designed seat back angle and actual seat back angle”
in Appendix 2; “the relation between vehicle basic reference marking and the three-
dimensional coordinate marking” in Appendix 3. The reason is that the contents have
already been clarified in standards GB 11551-2003 and GB11562-1994. And they are
consistent.
For ease of use, the following editorial modifications have been made to 78/317/EEC
directive in this standard.
— “This directive” is changed to “this standard”;
— “Definition” is changed to “terms and definitions”;
— Add informative Appendix.
Compared with GB11555-1994 and GB11556-1994, the main differences in this standard
are.
— Add “180° view-field in front of driver” (Chapter 1 in this edition);
— Add terms and definitions of “V point”, “R point” (3.8 and 3.9 in this edition);
— “Defrosting device” is changed to “defrosting system” (3.1 in this edition). “Demisting
device” is changed to “demisting system” (3.4 in this edition).
— Add “dimension and the features of steam generator” (6.2.2.1 d in this edition);
— Add “Within 5 minutes from the start of the test, it may adopt the programmable ‘fast
idle speed’ that is recommended by the manufacturer for cold weather engine start”
and “voltage on the wire-terminals of the defrosting system shall not be more than 20%
of the system’s rated voltage” (6.1.1.5 and 6.1.1.9 in this edition).
Appendix A of this standard is informative.
This standard was proposed by the National Development and Reform Commission.
This standard shall be administered by the National Automotive Standardization Technical
Committee.
Drafting organizations of this standard. Wuhan Auto Parts Research Institute, Dong Feng
Automotive Engineering Research Academe, and National Quality Certification Centre.
Main drafters of this standard. Li Zaihua, Yu Boying, and Qu Yanping.
The previous versions replaced by this standard are.
— GB 11555-1994;
— GB 11556-1994.
Motor vehicles - Windshield demisting and defrosting systems -
Performance requirements and test methods
1. Scope
This standard specifies motor vehicle windshield demisting and defrosting systems
performance requirements and test methods.
This standard is applicable to 180° view-field, in front of M1 vehicle’s driver.
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 11551-2003 The protection of the occupants 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 melts the frost or ice on the windshield, so that the vision is resumed.
3.2 Defrosting
Remove the frost or ice on the windshield through defrosting or the operation of the
windscreen wiper.
3.3 Defrosted area
The windshield area of which the surface is dry; or the covered frost is completely or
partially melted. The covered frost can be cleared by windscreen wiper from the outside.
This does not include the area that is covered by dry frost.
3.4 Demisting system
It is used to clear the cold condensed substances from the windshield, so that the vision is
resumed.
3.5 Mist
The condensed substance on the windshield’s surface.
3.6 Demisting
Through the operation of demisting system to remove the mist covered on glass’s surface.
3.7 Demisted area
The area on the windshield where the normal vision is possible, after demisting.
3.8 V point
V point is the point indicating driver’s eye position. It is determined by vertical plane of
central line of the driver’s seating position (if the seat is adjustable, move the seat to the
most-back position), R point, and designed seat back angle (see 3.4.1 in GB11562-1994). V
point is used to check if the vehicle’s vision complies with the requirements. V1 and V2
points are usually used to indicate the different positions of V point (see Figure 1).
3.9 R point
“R point” is the “seating reference point”. Its definition is as per 3.7 in GB 11551-2003.
4. Determination of A, B and A’ areas
4.1. A area is the area enclosed by the intersecting lines BETWEEN the 4 planes extended
from V point (i.e. V1 and V2. See 3.5.1 description in GB 11562-1994 3.5.1. V point is
determined according to the provision 5.1 in GB 11562-1994) AND the outer surface of
windshield’s glass (see Figure 1).
4.1.1. The vertical plane that passes through V1 and V2; and forms a 13° angle to X axis, at
the left-side of X axis.
4.1.2. The plane that passes through V1; forms a 3° elevation to the X axis; and is parallel to
Y axis.
4.1.3. The plane that passes through V1; forms a 1° depression to the X axis; and is parallel
to Y ax...