GB 11555-2025 PDF English
US$170.00 · In stock · Download in 9 secondsGB 11555-2025: Technical specification for demisting and defrosting systems of motor vehicles-windshield Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB 11555: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB 11555-2025 | English | 170 |
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Technical specification for demisting and defrosting systems of motor vehicles-windshield
| Valid |
| GB 11555-2009 | English | 85 |
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Motor vehicles-windshield demisting and defrosting systems -- Performance requirements and test methods
| Valid |
| GB 11555-1994 | English | 199 |
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Motor vehicles-Windshield demisters-Performance requirements and test methods
| Obsolete |
| GB 11555-1989 | English | RFQ |
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Passenger cars--Windshield demisters--Performance requirements
| Obsolete |
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GB 11555-2025: Technical specification for demisting and defrosting systems of motor vehicles-windshield
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GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.60
CCS T 26
Replacing GB 11555-2009
Technical Specification for Demisting and Defrosting
Systems of Motor Vehicles - Windshield
Issued on. MARCH 28, 2025
Implemented on. JANUARY 1, 2026
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative References... 4
3 Terms and Definitions... 4
4 Determination of Test Area... 5
5 Technical Requirements... 7
6 Test Methods... 8
7 Determination of the Same Type... 13
8 Implementation of the Standard... 14
Bibliography... 15
Foreword
This document was drafted in accordance with the rules provided in GB/T 1.1-2020 Directives
for Standardization - Part 1.Rules for the Structure and Drafting of Standardizing Documents.
This document serves as a replacement for GB 11555-2009 Motor Vehicles - Windshield
Demisting and Defrosting Systems - Performance Requirements and Test Methods. In
comparison with GB 11555-2009, apart from structural adjustments and editorial modifications,
the main technical changes are as follows.
a) The term “mist” and its definition are deleted (see 3.5 of Version 2009);
b) The definitions of the terms “V points” and “R point” are modified (see 3.7 and 3.8;
3.8 and 3.9 of Version 2009);
c) The angle in Figure 2 is modified (see Figure 2; Figure 2 of Version 2009);
d) The test conditions for windshield defrosting are modified (see 6.1.1; 6.1.1 of Version
2009);
e) The test equipment and requirements for windshield defrosting are modified (see
6.1.2; 6.1.2 of Version 2009);
f) The test procedures for windshield defrosting are modified (see 6.1.3; 6.1.3 of Version
2009);
g) The test conditions for windshield demisting are modified (see 6.2.1; 6.2.1 of Version
2009);
h) The test equipment and requirements for windshield demisting are modified (see 6.2.2;
6.2.2 of Version 2009);
i) The test procedures for windshield demisting are modified (see 6.2.3; 6.2.3 of Version
2009);
j) “Determination of the same type” is added (see Chapter 7);
k) “Implementation of the Standard” is added (see Chapter 8).
Please be noted that certain content of this document may involve patents. The institution
issuing this document does not undertake the responsibility of identifying these patents.
This document was proposed by and shall be under the jurisdiction of Ministry of Industry and
Information Technology of the People’s Republic of China.
This document was first issued in 1994 and first revised in 2009.This is the second revision.
Technical Specification for Demisting and Defrosting
Systems of Motor Vehicles - Windshield
1 Scope
This document specifies the technical requirements for the demisting and defrosting systems of
the front windshield glass of motor vehicles, describes the method for determining the test area,
the test methods for the demisting and defrosting systems, and the determination of the same
type.
This document is applicable to the design, manufacture and acceptance of the demisting and
defrosting systems of the front windshield glass of Category-M1 motor vehicles.
2 Normative References
The contents of the following documents constitute indispensable clauses of this document
through the normative references in the text. In terms of references with a specified date, only
versions with a specified date are applicable to this document. In terms of references without a
specified date, the latest version (including all the modifications) is applicable to this document.
GB 11562-2014 Motor Vehicles Forward Visibility for Drivers - Requirements and
Measurement Methods
3 Terms and Definitions
The following terms and definitions are applicable to this document.
3.1 defrosting
Through the operation of the defrosting system and / or windshield wipers, frost or ice is
removed from the outer surface of the windshield.
3.2 defrosting system
A system used to remove frost or ice from the outer surface of the windshield, thereby restoring
the field of vision.
3.4 demisting
Through the operation of the demisting system, the mist covering the inner surface of the
windshield is removed.
3.5 demisting system
A system used to remove condensation products from the inner surface of the windshield,
thereby restoring the field of vision.
3.6 demisted area
After demisting, the area on the inner surface of the windshield with the restored field of vision.
4 Determination of Test Area
4.1 Area A
Area A is the area enclosed by the intersection lines of the following four planes extending
forward from the V point and the outer surface of the front windshield (see Figure 1). The
positions of points V1 and V2 are determined in accordance with the provisions of 5.1 in GB
11562-2014.
4.2 Area B
Area B is the area enclosed by the intersection lines of the following four planes and the outer
surface of the front windshield, and is at least 25 mm inward from the edge of the transparent
area of the front windshield, whichever is smaller (see Figure 2).
5 Technical Requirements
5.1 Defrosting Requirements for Windshield
5.1.1 The vehicle shall be equipped with a defrosting system that can ensure to restore the
windshield visibility in cold weather conditions.
5.1.2 The defrosting system shall be tested in accordance with 6.1 and its defrosting
performance shall meet the following requirements.
5.2 Demisting Requirements for Windshield
6 Test Methods
6.1 Test Method for the Defrosting of Windshield
6.1.1 Test conditions
6.1.1.1 The test shall be carried out in a low-temperature chamber that is large enough to
accommodate the vehicle under test. The chamber shall be equipped with a refrigeration air
circulation device to circulate cold air.
6.1.1.3 The horizontal component of the air velocity in the low-temperature chamber shall be
lower than 2.2 m/s, and the measurement point is at point 0 as shown in Figure 3.
6.1.1.8 During the entire test period, the defrosting system shall be set to the maximum
operating position. If the vehicle manufacturer has special requirements, then, it shall be set in
accordance with the requirements specified by the vehicle manufacturer. During the test, the
use of wipers is permitted.
6.1.2 Test equipment and requirements
The test spray gun shall meet the following requirements.
6.1.3 Test procedures
6.1.3.1 In accordance with the procedures specified in Chapter 4, determine Area A, Area B and
Area A of the front windshield of the test vehicle.
6.1.3.5 After the test begins, draw a defrosted area outline on the inner surface of the windshield
every 5 minutes and mark the driver’s side.
6.2 Test Method for the Demisting of Windshield
6.2.1 Test conditions
6.2.1.1 The test shall be carried out in a low-temperature chamber that is large enough to
accommodate the vehicle under test and can maintain the test temperature at 3 C 1 C. The
location of the measurement point is shown in Figure 3.
6.2.1.5 If equipped with an engine, the engine speed with the transmission is in neutral shall
not exceed 50% of the maximum power speed (within the first 5 minutes after the start of the
test, the “fast idle” engine speed recommended by the vehicle manufacturer for starting the
engine in cold weather conditions may be used).
6.2.1.6 During the entire test period, the demisting system shall be set to the maximum
operating position. If the vehicle manufacturer has special requirements, then, it shall be set in
accordance with the requirements specified by the vehicle manufacturer.
6.2.2 Test equipment and requirements
6.2.2.1 The test steam generator (see Figure 4) shall meet the following requirements.
6.2.3 Test procedures
6.2.3.1 In accordance with the procedures specified in Chapter 4, determine Area A and Area B
of the front windshield of the test vehicle.
6.2.3.5 After the steam generator has been operating in the vehicle for 5 minutes, 1 ~ 2 test
personnel quickly enter the front row of the vehicle and the door opening time shall be less than
8 seconds. The amount of steam output by the steam generator shall be reduced by 70 g/h 5
g/h for each test personnel entering the vehicle.
6.2.3.6 One minute after the test personnel enter the vehicle, for test vehicles equipped with
only an engine, the test personnel shall, in accordance with the provisions of 6.2.1.5, start the
engine, and in accordance with the provisions of 6.2.1.6, turn on the demisting system, and the
test shall be deemed to have started;
6.2.3.7 10 minutes after the start of the test, record the test situation, draw a demisted area
outline on the inner surface of the windshield, and mark the driver’s side.
7 Determination of the Same Type
7.1 If the windshield defrosting system complies with the following provisions, then, it shall be
regarded as the same type.
7.2 If the windshield demisting system complies with the following provisions, then, it shall be
regarded as the same type.
8 Implementation of the Standard
For new vehicle models applying for type approval, implementation shall begin from the date
of implementation of this document.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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