This standard specifies the environmental conditions that may occur during the use of electrical and electronic products temporarily or permanently installed on ground vehicles. GB 4798.5-1987 Environmental conditions for the application of electrical and electronic products Ground vehicle use GB4798.5-1987 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Environmental conditions existing in the applicationof electric and electronic productsGround vehicle installationsUDC 621. 3
GB 4798.5 ---87
1.1 This standard adopts the international standard IEC721-3-5 (1985) Environmental Condition Classification Part 5: "Classification of Environmental Parameters and Their Severity Classification - Ground Vehicle Installations". 1.2 This standard specifies the environmental conditions that electric and electronic products temporarily or permanently installed on ground vehicles may be subjected to during use.
Ground vehicles include: road vehicles (such as caravans, motorcycles, trailers, etc.), rail vehicles (such as railway locomotives, etc.), off-road vehicles (such as tractors), loading and unloading and storage vehicles (such as forklifts, etc.), and self-propelled machinery. 1.3 In order to cover a wide range of applications with limited environmental condition levels, this standard specifies the classification of environmental parameters and their severity levels, which can be used as a basis for product design and manufacturing. 1.4 The relevant provisions in this standard are consistent with GB4798.10-84 "Introduction to Environmental Conditions for Application of Electrical and Electronic Products" and GB4796-84 "Classification of Environmental Parameters and Severity Levels for Electrical and Electronic Products". 2 Terms and Terms
2.1 The relevant provisions in GB2422-81 "Terms and Terms for Basic Environmental Test Procedures for Electrical and Electronic Products" apply to this standard. 2.2 Internal Installation: The product is installed inside the vehicle, and the interior is completely isolated from the outside or protected from external influences. Or when the vehicle is not moving, it is only protected from falling objects from the sky.
2.3 External Installation: The product is installed outside the vehicle and has no protection against external influences. 2.4 Weather-Protected Places: The place has protective facilities to prevent the direct impact of all weather. 3 Classification of environmental parameters and their severity levels
3.1 Classification of environmental parameters
This standard specifies the classification and codes of environmental parameters as follows: a.
Climate conditions, see Table 1;
Biological conditions, see Table 2;
Chemically active substances, see Table 3;
S-mechanically active substances, see Table 4;
Contaminated liquids, see Table 5;
Mechanical conditions, see Table 6.
Severity levels of environmental parameters
Approved by the National Bureau of Standards on August 19, 1987
Implemented on May 1, 1988
GB4798.5-87
The code for the severity level of environmental parameters is represented by a combination of two Arabic numerals with an English letter in the middle. In this standard, the first number of the severity level code is 5, which represents ground vehicle equipment. The letter in the middle represents the classification of the environmental parameter. The last number represents the severity level. The larger the number, the higher the level and the more severe the environmental conditions. Examples of code representation of severity levels: 5
Lowest level
Climate conditions
Ground vehicle equipment
Some levels can be further derived from other levels, such as 5K4L, 5K4H and 5K3C. The first two are restrictions on the high and low temperature parameters of the 5K4 level; the latter is applicable to products included in the 5K3 level used in cold climate areas. Higher numerical levels include all environmental conditions represented by lower numerical levels. For example, 5K4 includes 5K3, 5K2 and 5K1. The lowest level combination, 5K1/5B1/5C1/5S1/5F1/5M1, constitutes the best environmental conditions for product installation. The highest level combination, 5K4/5B3/5C3/5S3/5F3/5M4, constitutes the worst environmental conditions for product installation. 18-
Environmental parameters
High temperature (outdoor or ventilated room,
except engine room)①
High temperature (unventilated room,
except engine room)②
High temperature (in engine room)
Temperature change, air/air?
Temperature change gradually, air/air
(except engine room)
Temperature change gradually, air/air
(in engine room)
Temperature change, air/water (except engine room)@④
Temperature change, air/water (in engine room③@| |tt||Temperature changes, air/snow (only in the engine compartment)
Relative humidity without rapid temperature changes (except the engine compartment of vehicles driven by internal combustion engines)
Relative condensation without rapid temperature changes (in the engine compartment of vehicles driven by internal combustion engines)
Relative humidity with rapid temperature changes, air/air (not near refrigeration, air conditioning systems)
Relative humidity with rapid temperature changes, air/air (near refrigeration, air conditioning systems)
GB 4798. 5—87
Climate conditions (K)
—25/+30
—40/+30
—25/+30
—40/+30
—65/+30||t t||—50/+30
—25/+30
—65/+30
—50/+30
—65/+30
—25/+30
65/+ 30
65/+70|-25/+70
-25/+60
—40/+70-50/+70
+40/+5
+40/+5
+60/+5
+70/+5
+70/+5
-65/+70
+55/+5+55/+5+40/+5
+85/+5
+85/+5
+70/+5
+70/-5+70/-5
+60/—5-
+70/—5
+70/-5
—25/+3 0—65/+30
—50/+30-65/+30
-25/+30
—40/+30
|+10/+70+10/+70/+10/+85+1 0/+85|+10/+70+10/+70
Environmental parameters
Absolute
integer with sharp temperature changes, air/air?
Low relative humidity
Low air pressure
Circumferential air movement
Solar radiation
Heat radiation (except engine room)
Heat radiation (in engine room)
Water (except precipitation)①
mm/min
GB 4798.5—87
Continued Table 1
+70/+15
+70/+15
+70/+15
+85/+15
With wet surface
Note: ①High temperature on the product surface may be affected by the ambient air temperature and solar radiation given here, ②High temperature on the product surface may be affected by the ambient air temperature and solar radiation through the window given here. ③Assume that the product moves directly between the two temperatures given. ④Low temperature is equivalent to the temperature of tap water.
+85/+15
+70/+15
③Assume that the product is only subjected to a sharp drop in temperature (not a sharp rise). The moisture content values ​​given are applicable when the temperature drops to the dew point; at lower temperatures, the relative humidity can be considered to be close to 100%. ③70kPa represents the limit value for ground transportation, corresponding to an altitude of about 3000m. For areas where the air pressure is less than 70kPa, ground vehicles can be considered according to the actual use environment.
③The values ​​given here refer to the injection speed, not the precipitation. Table 2 Biological conditions (B)
Environmental parameters
Bacteria, fungi, etc.
Rodents or other harmful
animals (excluding termites)
Rodents or other harmful
animals (including termites)
Sulfur oxides
Hydrogen sulfide
Nitrogen oxides (expressed as equivalent
values ​​of nitrogen dioxide)
Hydrogen fluoride
Hydrogen fluoride
GB4798.5—87
Table 3 Chemically active substances (C)
Salt spray conditions
Solid salt and brine conditions
1. 0 (0.3)
0. 5 (0. 1)
0.1(0.05)
0. 5(0. 1)
0. 03(0. 01)
3. 0(1. 0)
Note: The values ​​in this table are the maximum values ​​of the daily cycle exceeding 30min. The values ​​in brackets in the table are the average values. Table 4 Mechanically active substances (S)
Environmental parameters
Sand (including gravel)
mg/(m'-h)
0. 3(0. 1)
Engine oil
Gear oil
Hydraulic oil
Transformer oil
Brake fluid
Coolant
Grease
Battery solution
Environmental parameters
Steady-state sinusoidal vibration①
Displacement amplitude
Acceleration amplitude
Frequency range
Stationary random vibration③
Acceleration spectral density
Frequency range
Unsteady-state vibration (including shock)
Shock response spectrum type 1 (Figure 1)
Acceleration peak value.
Impact response spectrum (Figure 1)
Acceleration peak
GB 4798.5-—87
Table 5 Contaminated liquid (F)
Mechanical conditions (M)
9~2002~9 9~200 200~5002~8 8~200 200~500|2~88~200200~5002～9
10~200200~500
10~200 200-500
10~~200200～500
Note: ①For products installed on high internal damping structures, the frequency range can also be limited to 200Hz for 5M2 and 5M3 grades. ②5M4 level is suitable for road vehicles used on bad roads in areas without good highway systems. 10
10~200200~500
③In the actual measurement results, there are 3~50m/s acceleration spectrum density values ​​in the frequency range of 2~10Hz, which are not included in this table. It is hoped that designers and manufacturers will pay necessary attention to it.
GB4798.5—87
Figure 1 Typical shock response spectrum (first-level maximum shock response spectrum) 1-Typical shock spectrum with long duration and relatively low peak acceleration-Typical shock spectrum with medium duration and medium peak acceleration2000
GB4798.5—87
Appendix A
Description of selecting environmental numbers and their severity levels (supplement)
For each environmental parameter, this appendix gives various possible use locations. Different use locations have different corresponding environmental condition levels.
In Tables A1 to A6, the first column from the left describes the place of use. The "×" under the grade item in each table indicates that the corresponding grade is applicable to the place of use, and the first "×" from the left represents the minimum grade applicable to the place of use. The first "×" from the left under the grade item in Table A1 represents the minimum grade applicable to the place of use in the area with the corresponding climate type. A.2
Description of place of use
Climatic conditions, see Table A1;
Biological conditions, see Table A2
Chemically active substances, see Table A3,
Mechanically active substances, see Table A4t
Contaminated liquids, see Table A5;
Mechanical conditions, see Table A6.
For use only in vehicles with weather protection and heating
places, or in heating
places, and for use after preheating
external installation. Products used in heated rooms or in non-heated rooms before preheating High temperature (outdoors or in ventilated rooms, excluding engine room) Only used in vehicles with weather protection and temperature control Temperature controlled rooms External installation, only used in vehicles with weather protection and ventilation, or in ventilated rooms High temperature (unventilated rooms, excluding engine room) Closed, unventilated rooms High temperature (in engine room) Instrument used in motor-driven vehicles with weather protection and ventilation GB 4798.5—87
cold cold warm
sub-condensing
cold warm warm
hot hot hot cold cold warm warm
|x|x/x|x|x
xIxIxx
xIxx/xIx
extremely humid constant
hot hot hot
×/××||tt ||5K15K25K3
50—6525
+40+40+40+40+55+55+40
1xIx/ x
+70+70+70+85+85+70
60+70+70+70+85-
+85+70||tt ||For outdoor use in electric motor-driven vehicles
Internal combustion engine-driven vehicles
Temperature changes, air/
are not subjected to ambient air
temperature changes
When doors, windows, and lids are opened, air can directly
enter and be sucked in
room, or external installation: vehicles move between warm
indoors and cold
outdoors
Temperature changes gradually,
air/air (excluding engine compartment)
For use only in vehicles with weatherproof
expansion areas
air cannot directly enter
room. Vehicles that do not
move between
indoors and outdoors. Not
between warm indoors and
cold outdoors
Rapidly preheated interior of a vehicle (caused by inherent or additional heating system
GB 4798.587
Continued Table Al
Extremely cold, warm, ten
Super cold, warm, dry, sub-humid
Warm, hot, hot
Hot, cold, warm
Warm, hot, hot
××××
25/—40/
—65/—25/—65/
-25/-65/
+30+30
The temperature changes gradually. Air/air (engine/motor-driven vehicles/internal combustion engine-driven vehicles/temperature changes, air/water (engine room in addition to rain protection, but also other water/water) external installation. After the sun's radiation, directly subject to rain or spray water/temperature changes, air/water (engine room)/motor-driven vehicles/internal combustion engine-driven vehicles. Not waterproof/internal combustion engine-driven vehicles/vehicles. Not waterproof/temperature changes, air/water (instrument in the engine room/snow protection. Motor-driven vehicles/not shielded/GB 4798. 5--87
Continued Table A1
Air type
Cold temperature
Cold warm
××/×××××/×/x
×××
Extremely warm
Hot hot hot
25/—40/
+40/+40/
+55/+55/+40/
+60/+70/+70/-+85/+85/+70/
+60/+70/+70/
+70/+70/+70/
Vehicles with weak internal combustion engines
Not mildew-proof
Not accompanied by rapid temperature changes
GB 4798. 5--87
Continued Table A1
Climate Type
Cold
Dry [Sub-humid
Extreme
Dry [Extreme (
Cold into the hot
Hot cold
Hot hot
Hot hot
Hot hot
Relative exposure to temperature changes (internal %RH
Except for engines of combustion engine driven vehicles)
For vehicles with humidity controlled or heated areas only
External installation. Or ventilated indoor
of outdoor vehicles
Subject to solar radiation. Unventilated indoor
with condensation surfaces (water evaporation)
Relative exposure to temperature changes not accompanied by rapid temperature changes (internal %RH
Combustion engine driven vehicles)
For vehicles with humidity controlled or heated areas only
External installation. Or ventilated indoor
of outdoor vehicles
Subject to solar radiation. Unventilated indoor
with condensation surfaces (water evaporation) bzxZ.net
Relative exposure to temperature changes not accompanied by rapid temperature changes (internal %RH
Combustion engine driven vehicles) Engine compartment of a motor-driven vehicle) with damp surfaces or water vapor from rain (the vehicle can be stationary) Relative humidity of the air with sudden temperature changes, air/(not near refrigeration or air conditioning systems) ××/×/×/x×××x/x/×
x/x-xIx
x[x[x[x/
Xx/X/X/
5K25K3
+30+40||tt ||40/—50/
+85+70
-65/--25/--65/
+30+30+30
+30+30
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