GB/T 12782-2022 English PDF (GBT12782-2022)

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GB/T 12782-2022: Requirement and test method of heating performance for motor vehicle
GB/T 12782-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.020
CCS T 04
Replacing GB/T 12782-2007
Requirement and Test Method of Heating Performance for
Motor Vehicle
ISSUED ON: DECEMBER 30, 2022
IMPLEMENTED ON: JULY 1, 2023
Issued by: State Administration for Market Regulation;
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 Performance Requirements ... 6
5 Test Conditions ... 6
6 Test Methods ... 8
7 Test Data Processing and Test Report ... 11
Appendix A (informative) Transient Condition and Data of Heating Performance of
Chinese Motor Vehicles ... 12
Appendix B (informative) Test Report ... 86
Requirement and Test Method of Heating Performance for
Motor Vehicle
1 Scope
This document specifies the requirement, test method, data processing and test report of heating
performance for motor vehicle.
This document is applicable to Category-M and Category-N 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/T 12534 Motor Vehicles - General Rules of Road Test Method
GB/T 15089 Classification of Powder-driven Vehicles and Trailers
GB 18352.6 Limits and Measurement Methods for Emissions from Light-duty Vehicles
GB/T 19596 Terminology of Electric Vehicles
GB/T 27840 Fuel Consumption Test Methods for Heavy-duty Commercial Vehicles
GB/T 38146.1 China Automotive Test Cycle - Part 1: Light-duty Vehicles
GB/T 38146.2 China Automotive Test Cycle - Part 2: Heavy-duty Commercial Vehicles
3 Terms and Definitions
What is defined in GB/T 15089, GB/T 19596, GB/T 38146.1 and GB/T 38146.2, and the
following terms and definitions are applicable to this document.
3.1 position of measuring temperature
Position of measuring temperature refers to the installation position of temperature sensor.
3.2 steady state condition
Steady state condition refers to the driving condition, in which, the vehicle speed remains
constant for a certain period of time.
3.3 transient condition
Transient condition refers to the driving condition, in which, the vehicle speed continuously
changes within a certain period of time.
4 Performance Requirements
In accordance with the test conditions provided in 6.2.2, when conducting heating performance
test at an ambient temperature of (25  3) C for 40 min and 60 min, the heating performance
of the vehicle shall reach the following requirements.
a) For Category-M1 and Category-N vehicles:
1) The temperature of the driver’s and front passenger’s feet shall not be lower than
15 C;
2) The temperature of other passengers’ feet shall not be lower than 12 C.
b) For Category-M2 and Category-M3 vehicles:
1) The temperature of the driver’s and front passenger’s feet shall not be lower than
15 C;
2) In accordance with the number of seat rows of the sample vehicle, the
temperature of the feet of the front row, middle row, behind the door and the last
row of seats near the side wall in other passenger areas shall not be lower than
12 C.
5 Test Conditions
5.1 Test Instrument
The measurement parameters, unit and accuracy requirements of the test instrument are shown
in Table 1.
---For Category-M vehicles (excluding city buses) and Category-N vehicles whose
maximum design total mass is greater than 3,500 kg, the test time is 60 min; successively
carry out the test in accordance with the requirements of low-speed section, high-speed
section and idle-speed section; each section lasts 20 min; the low-speed section is set at
45 km/h and the high-speed section is set at 80 km/h;
---For city buses, the test time is 60 min; successively carry out the test in accordance with
the requirements of low-speed section, high-speed section and idle-speed section; each
section lasts 20 min; the low-speed section is set at 25 km/h and the high-speed section
is set at 55 km/h.
If the maximum speed of the test vehicle is lower than the speed requirements of the above-
mentioned high-speed section, then, in accordance with 90% of the maximum vehicle speed,
carry out the test.
6.2.3 Transient condition
The transient condition for the heating performance test of motor vehicle is shown in Appendix
A.
6.3 Test Procedures
6.3.1 Road test procedures
6.3.1.1 The test vehicle shall be parked under the environmental conditions provided in 5.2 for
at least 10 h. During vehicle immersion, the doors, windows and vent holes may be kept open.
If it is confirmed that the temperature of engine coolant, engine oil, or system components, such
as: power battery and motor, has been stabilized, and the temperature change within 1 h is less
than  1 C, the parking stage can be terminated in advance.
6.3.1.2 Check whether the radiator, radiator water pipes and heater water tank pipes are frozen.
If they are frozen, the test shall be terminated.
6.3.1.3 Check the test instrument and clean the inner and outer surfaces of the windshield.
6.3.1.4 All test personnel enter the vehicle, close the doors, windows and vent holes, and in
accordance with the following requirements, conduct the test:
---For Category-M1 and Category-N1 vehicles, as well as Category-M2 vehicles whose
maximum design total mass does not exceed 3,500 kg, after the test driver starts the
engine (if necessary, some external equipment can be used to start the engine) or after
the pure electric vehicle, hybrid electric vehicle and fuel cell electric vehicle are
powered on and the system is adjusted to the READY state, in accordance with the
requirements of 6.2.2, conduct the test;
---For Category-M vehicles and Category-N vehicles whose maximum design total mass
is greater than 3,500 kg, after reaching the warm-up state specified by the automobile
manufacturer, in accordance with the requirements of 6.2.2, conduct the test.
For vehicles equipped with an independent combustion-type heating device, 10 min before the
start of the test, light the heating device for pre-heating.
6.3.1.5 After the test begins, all heating devices shall be turned on and adjusted to the maximum
heating state; the state of auxiliary heating devices (such as: steering wheel heating and seat
heating, etc.) shall comply with the requirements of the vehicle manufacturer; the circulation
mode shall be set to the outer circulation (no mode switching is in the automatic mode, and the
passenger vehicle may set the circulation mode in accordance with the requirements of the
vehicle manufacturer); the air outlet mode adjustment switch shall be placed at the foot position
(if defogging is required, the defogging mode can be used and switch back to the foot blowing
mode after the defogging is completed). For vehicles with different driving modes, the normal
driving mode should be selected during the test.
6.3.2 Laboratory test procedures
6.3.2.1 For Category-M1 and Category-N1 vehicles, as well as Category-M2 vehicles whose
maximum design total mass does not exceed 3,500 kg, the setting of chassis dynamometer shall
be carried out in accordance with the requirements...