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This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by and is under the jurisdiction of the National Technical Committee 79 on Radio Jamming of Standardization Administration of China (SAC/TC 79).
Measurement methods for electromagnetic fields of vehicle with regard to human exposure
1 Scope
This standard specifies the measurement methods for low-frequency magnetic field emission in the vehicle environment exposed to by human beings.
This standard is applicable to the frequency range of 10 Hz to 400 kHz.
This standard is applicable to Categories L, M and N vehicles.
This standard is not applicable to measurement of vehicles under wireless charging state.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 3730.1 Motor vehicles and trailers—Types—Terms and definitions
GB/T 4365-2003 Electrotechnical terminology—Electromagnetic compatibility
GB/T 5337 Nomenclature and terminology for automotive electrical equipment, lighting and instrumentation
GB 8702-2014 Controlling limits for electromagnetic environment
GB/T 15089 Classification of power-driven vehicles and trailers
GB 18285-2005 Limits and measurement methods for exhaust pollutants from vehicles equipped ignition engine under two-speed idle conditions and simple driving mode conditions
GB/T 19596 Terminology of electric vehicles
GB/T 29259 Road vehicle — Electromagnetic compatibility terminology
IEC 62311:2008 Assessment of electronic and electrical equipment related to human exposure restrictions for electromagnetic fields(0 Hz~300 GHz)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 3730.1, GB/T 4365-2003, GB/T 5337, GB 8702-2014, GB/T 15089, GB 18285-2005, GB/T 19596, GB/T 29259 as well as the following apply.
3.1
magnetic induction strength
force applied by vector field B on the charged particle at a certain speed, which is equal to vector product of speed and B and then multiplied by particle charge, expressed as Tesla (T). The magnetic induction strength is equal to the product of magnetic field strength multiplied by magnetic permeability μ0 in air, i.e. B=μ0H.
[Definition 3.8 in GB 8702-2014]
3.2
general public exposure
all electric, magnetic and electromagnetic fields exposure borne by public, excluding occupational exposure and medical exposure
3.3
internal combustion engine
machine that converts chemical energy from fuel combustion into thermal energy and then into mechanical energy inside the engine cylinder.
3.4
internal combustion engine vehicle; ICEV
vehicle powered entirely by an internal combustion engine.
3.5
idling
state of engine running without load. That is, the clutch is in the engaged position and the gearbox is in the neutral position (the vehicle with automatic gearbox in the "parking" or "P" position); for the vehicle with the carburetor fueling system, the choke valve is in the fully open position; the accelerator pedal is in the fully released position.
3.6
standby
state of drive motor system being powered at high voltage while not running.
4 General requirements
4.1 Environmental conditions
During the test, the ambient temperature shall be -7℃ ~ 35℃.
4.2 Interference source
This standard measurement is applicable to long-term interference sources (e.g. front windshield wiper and warm air motor), while it is not applicable to short-term interference sources (e.g. power mirror, electric window, electric horn and hazard warning lamp).
4.3 Requirements for limits
See Tables A.1, A.2 and A.3 in Annex A for the limit requirements referred to during measurement.
4.4 Measurement site
The measurement may be carried out on an indoor dynamometer or on an outdoor flat and dry road. The slope of the outdoor road shall be between -2% and + 2%. The magnetic induction strength at the measurement site is less than 10% of the limit in Annex A. If the measurement is carried out on a dynamometer, the road load shall be set according to the curb weight of the vehicle.
4.5 Measuring instruments
The measuring instruments shall be able to be used in magnetic field measurement, the frequency range of which shall meet the requirements of 10 Hz to 400 kHz. The magnetic field probe shall be isotropic and its outer diameter shall not exceed 13 cm.
When measuring in the time domain, the measuring instruments shall be able to weight the measured data according to the time domain measurement method in IEC 62311:2008 and output the weighted measurement value of magnetic induction strength expressed in percentage. When measuring in the frequency domain, the measuring instruments may output frequency domain measurement results of the magnetic field of 10 Hz ~ 400 kHz. The minimum requirements for frequency resolution of data acquisition by frequency domain measuring instruments are shown in Table 1.
Note: In order to meet the measurement requirements of narrow parts, measurement probes with the same performance and smaller volume may also be used for measurement.
Table 1 Minimum requirements for frequency resolution
Frequency range Frequency resolution
10 Hz≤f<5 kHz ≤1 Hz
5 kHz≤f<50 kHz ≤5 Hz
50 kHz≤f≤400 kHz ≤50 Hz
5 Measurement positions
5.1 Measurement positions for Category M passenger vehicles
5.1.1 Measurement positions for static state and driving state
See Figure 1 for the measurement positions for Category M passenger vehicles under static state and driving state, including:
——Driver position: divided into seat position and feet space. As shown in Figure 2, the seat position test points are three fixed test points passing through the seat centerline: a) the center of the head pillow, b) the center of the seat back, and c) the center of the seat cushion; the feet space is divided into four sub-areas, and the test points are all the center points of the sub-areas, as shown in points A, B, C and D in Figure 3;
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 General requirements
4.1 Environmental conditions
4.2 Interference source
4.3 Requirements for limits
4.4 Measurement site
4.5 Measuring instruments
5 Measurement positions
5.1 Measurement positions for Category M passenger vehicles
5.1.1 Measurement positions for static state and driving state
5.1.2 Measurement positions for charging state
5.2 Measurement positions for Category M commercial vehicles (buses and coaches)
5.2.1 Measurement positions for static state and driving state
5.2.2 Measurement positions for charging state
5.3 Measurement positions for Category N commercial vehicles (trucks)
5.4 Measurement positions for Category L motor vehicles
6 Measurement procedures
6.1 Measurement for static state
6.1.1 Vehicle state
6.1.2 Method of measurement
6.2 Measurement for driving state
6.2.1 Vehicle state
6.2.2 Method of measurement
6.3 Measurement for charging state
6.3.1 Vehicle state
6.3.2 Method of measurement
6.4 Measurement process
7 Evaluation method
8 Test report
Annex A (Informative) General public exposure limits of electromagnetic fields
Annex B (Informative) Evaluation methods
Bibliography
