GB/T 37130-2018Measurement methods for electromagnetic fields of vehicle with regard to human exposure (English PDF)

3.1 Magnetic Induction Strength

Vector field B, whose force acting on charged particle at a certain speed equals to the product of speed and vector B, and further multiplying with particle charge. It shall be expressed in Tesla (T).

3.2 General Public Exposure

General public exposure refers to all the electric field, magnetic field and electromagnetic field irradiation exposed to the public, excluding occupational exposure and medical exposure.

3.3 Internal Combustion Engine

Internal combustion engine refers to a machine which transforms chemical energy of fuel combustion to thermal energy, then, transforms thermal energy to mechanical energy. Furthermore, this energy transformation process is conducted inside engine cylinder.

3.4 Internal Combustion Engine Vehicle; ICEV

Internal combustion engine vehicle refers to vehicle, whose power is completely provided by internal combustion engine.

3.5 Idling

Idling refers to engine's unloaded operation status. Under idling status, the clutch is in a joint position, the transmission is in a neutral position (vehicle with automatic transmission shall be in "parking" or "P" gear position); in terms of vehicle which adopts carburetor oil supply system, the damper shall be in a fully open position; accelerator pedal shall be in a fully loosened position.

3.6 Standby

Standby refers to when the driving motor system is under high voltage power-on status, but the driving motor is not being operated.

4.1 Ambient Conditions

During the test, ambient temperature shall be -7 °C ~ 35 °C.

4.2 Disturbance Source

The measurement in this Standard is applicable to long-term disturbance sources (such as front wiper motor and warm air motor). It is not applicable to short-term disturbance sources (electric rearview mirror, electric window, electric horn and hazard warning lamp).

4.3 Limit Requirements

Reference limit requirements of the measurement shall refer to Table A.1, Table A.2 and Table A.3 in Appendix A.

4.4 Measurement Site

The measurement can be conducted with indoor dynamometer or outdoor flat and dry pavement. The gradient of outdoor pavement shall be -2% ~ +2%. In the measurement site environment, magnetic induction strength shall be lower than 10% of the limit value in Appendix B. If the measurement is conducted with dynamometer, road load shall be set up in accordance with vehicle's reconditioning quality.

4.5 Measurement Instruments

Measurement instruments shall be able to conduct magnetic field measurement. The frequency range shall satisfy the requirement of 10 Hz ~ 400 kHz. Magnetic field probe shall be isotropic; the external diameter shall not exceed 13 cm.

5.1 Measurement Position of Type-M Passenger Vehicle

5.1.1 Measurement position in stationary state and driving state

Measurement position of type-M passenger vehicle in stationary state and driving state is shown in Figure 1. It includes.

5.1.2 Measurement position in charging state

Measurement position of type-M passenger vehicle in charging state is shown in Figure 5. It includes.

5.2 Measurement Position of Type-M Commercial Vehicle (bus)

5.2.1 Measurement position in stationary state and driving state

Measurement position of type-M commercial vehicle (bus) in stationary state and driving state is shown in Figure 7. It includes.

5.2.2 Measurement position in charging state

Measurement position of type-M commercial vehicle (bus) in charging state is shown in Figure 8. It includes.

5.3 Measurement Position of Type-N Commercial Vehicle (truck)

Measurement position of type-N commercial vehicle (truck) in stationary state and driving state includes fixed test-spots on various seats in driver's cab, corresponding foot space area test-spots of various seats and sleeping berth area.

5.4 Measurement Position of Type-L Motor Vehicle

Measurement position of type-L (less than four wheels) motor vehicle in stationary state and driving state shall be driver's standard position. the following three specific fixed test-spots. d) human body's head; e) trunk's center; f) center of riding position, as it is shown in Figure 10[1].

6.1 Measurement in Stationary State

6.1.1 Vehicle state

All the vehicle-mounted electrical appliances that can be manually opened by driver or passenger and continuously work for over 60 s shall be in typical loaded state. The recommended state shall at least include.

6.1.2 Measurement methods

6.1.2.1 Measurement methods of time domain

Please see the measurement methods and steps of time domain below.

6.1.2.2 Measurement methods of frequency domain

Please see the measurement methods and steps of frequency domain below.

6.2 Measurement in Driving State

6.2.1 Vehicle state

All the vehicle-mounted electrical appliances that can be manually opened by driver or passenger and continuously work for over 60 s shall be in typical loaded state. The recommended state is as follows. […]

6.2.2 Measurement methods

Same as 6.1.2.

6.3 Measurement in Charging State

6.3.1 Vehicle state

Vehicle shall be in OFF gear. Shut down all the vehicle-mounted electrical appliances that can be manually opened by driver or passenger.

Vehicle's SOC shall be 20% ~ 80%. If there are multiple conductive charging states, measure respectively; under the various charging states, charging current shall be more than 80% of the rated charging current.

6.3.2 Measurement methods

Same as 6.1.2.

6.4 Measurement Procedure

The typical measurement procedure of measurement methods stipulated in this Standard is shown in Figure 11.