GB/T 28046.1-2011 English PDF (GBT28046.1-2011)

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GB/T 28046.1-2011: Road vehicles -- Environmental conditions and testing for electrical and electronic equipment -- Part 1: General
GB/T 28046.1-2011
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.10
T 36
Road vehicles - Environmental conditions and testing
for electrical and electronic equipment –
Part 1. General
(ISO 16750-1.2006, MOD)
ISSUED ON. OCTOBER 31, 2011
IMPLEMENTED ON. FEBRUARY 1, 2012
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
Introduction ... 5
1 Scope ... 9
2 Normative references ... 9
3 Terms and definitions ... 10
4 Classification by mounting location ... 12
5 Operating modes ... 13
6 Functional status classification ... 14
7 Tests and requirements ... 15
8 Designation ... 15
Annex A (informative) Example for a test sequence plan ... 18
Annex B (informative) Example of life test/statement of reliability ... 19
Foreword
GB/T 28046 “Road vehicles - Environmental conditions and testing for electrical and
electronic equipment” consists of five parts.
- Part 1. General;
- Part 2. Electrical loads;
- Part 3. Mechanical loads;
- Part 4. Climatic loads;
- Part 5. Chemical loads.
This Part is Part 1 of GB/T 28046.
This Part is drafted in accordance with the rules given in GB/T 1.1-2009.
This Part is prepared by using the redrafting method to amend and adopt ISO 16750-
1.2006 “Road vehicles - Environmental conditions and testing for electrical and
electronic equipment - Part 1. General”.
The technical differences between this Part and ISO16750-1.2006 are as follows.
- ADJUST the order of the terms by bringing the test voltage before the supply
voltage operating mode 3 UA, to make it more logical and easy to understand the
standard;
- Figure 1 uses the old version of the format, which is moderately simplified.
Compared with ISO16750-1.2006, the editorial modifications of this Part are as follows.
- DELETE the foreword of the International Standard.
This Part is proposed by the National Development and Reform Commission.
This Part is under the jurisdiction of the National Technical Committee on Automotive
of Standardization Administration of China (SAC/TC 114).
Drafting organizations of this Part. China Automotive Technology and Research Center,
Changsha Automobile Electric Appliance Research Institute, Shanghai Institute of
Quality Supervision, Inspection and Technology, Suzhou Tai Site Electronic
Technology Co., Ltd., Shenzhen Hangsheng Electronics Co., Ltd., Dongfeng
Commercial Vehicle Technology Center, Shanghai Keshida Huayang Automotive
Electric Co., Ltd., Zhengzhou Yuebo Auto Electric Co., Ltd.
‐ Mounting location in the vehicle
In current or future car concepts, systems/components are mounted in almost any
location of the car. The environmental requirements for each specific application
highly depend on its mounting location. Each location in a car has its distinct set
of environmental loads. As an example, the range of temperatures in the engine
compartment differs significantly from the range in the passenger compartment.
This is also true for the vibration loads. But in this case, not only the vibration
levels are different, the type of vibration load also varies. Body mount components
are typically exposed to random vibrations whereas for engine mount
systems/components the additional sine vibration from the engine is considered.
Devices installed in doors are exposed to a high number of mechanical shocks
from door slamming additionally.
It is desirable for the car manufacturer to group the different environmental load types
and levels in a reasonable number of standard requirement sets. This strategy makes
it possible to carry systems/components from one car project to another. Furthermore,
the exact requirement levels are often unknown when designing a component for a
future car concept. The expected environmental loads are usually compiled from other
car concepts with similar conditions. The grouping is normally done by mounting
location, but it is difficult to define the right number of different mounting locations and
respective load profiles, because there is a conflict of aims between having only few
requirement classes and tailoring to the requirement levels for each application. The
reason is that the environmental loads are not only depending on the mounting location.
There are other major factors that affect the stress levels for systems/components. For
examples, body styles, drive-train concepts or package densities can create absolutely
different requirement levels for devices that are installed in different cars at almost the
same location.
This series of standards is to define requirement classes for separate load types. It
distinguishes between electrical, mechanical, thermal, climatic and chemical loads. For
each load type, several requirement classes are defined. Every requirement class is
determined by a specific code letter. The complete environmental requirement set is
created by defining the code letter combination. The code letters are defined in the
respective clauses of this Part. Additionally, tables in the annexes of each part consists
of usual mounting locations and define examples of their respective code letters. For
normal applications, these code letters are used. If an application is very specific and
therefore the given code letter combinations can not be used, it is possible to create
new code letter combinations to serve this purpose. In case none of the given code
letters is useable, new requirement levels can be created by using the code letter “Z”.
In this case, the specific requirements need to be defined separately, but it is desirable
not to change the test methods.
It is recommended for the user of this series of standards to consider at least the
following mounting locations for a device under test (DUT) with respect to thermal,
mechanical, climatic and chemical load.
a) Applicability to manufacturers responsibility
Due to technology limitations or variations in vehicle design, the vehicle
manufacturer may be required to place a component in a location where it cannot
withstand the environmental conditions described in this series of standards.
Under these circumstances, it is the responsibility of the vehicle manufacturer to
provide the necessary environmental protection.
b) Applicability to wiring harnesses, cables and electrical connectors
Although some environmental conditions and tests in this series of standards
may be relevant to vehicle wiring harnesses, cables and connectors, its scope is
not sufficient to be used as a complete standard. It is therefore not recommended
that this series of standards be directly applied to such devices and equipment.
Applicable standards are taken into account.
c) Applicability to parts or assemblies in or on equipment
This series of standards describes environmental conditions and tests to be
applied to electrical and electronic equipment directly mounted in or on the
vehicle. It is not intended for direct application to parts or assemblies that are
part of the equipment. For example, this series of standards should not be
directly applied to integrated circuits (ICs) and discrete components, electrical
connectors, printed circuit boards (PCBs), gauges, displays, controls, etc. that
are attached in or on the equipment. Electrical, mechanical, climatic and
chemical loads for such parts and assemblie...