GB/T 38444-2019Electronic toll collection—On board unit (English PDF)

3.1 Terms and definitions

The following terms and definitions are applicable to this document.

3.1.1 Electronic toll collection on board unit

An electronic device that is installed in the vehicle and performs two-way communication with ETC RSU to realize the electronic toll collection function.

3.1.2 Electronic toll collection roadside unit

An electronic device that is installed outside the vehicle and performs two-way communication with ETC OBU to realize the electronic toll collection function.

3.1.3 Transaction

The process where ETC OBU and ETC RSU establish a communication link and complete the toll collection.

3.2 Abbreviations

The following abbreviations apply to this document.

4.5.2.5.3 Startup characteristics

Perform the test in accordance with 5.3.5.1.5.3. After the test, the transaction function of ETC OBU shall be normal.

4.5.2.6 Backward voltage

Perform the test in accordance with 5.3.5.1.6. After the test, an internal inspection (whether internal components are damaged) is required; the transaction function of ETC OBU shall be normal.

4.5.2.7 Reference ground and power offset

Perform the test in accordance with 5.3.5.1.7. For multi-grounded ETC OBU, the ETC OBU transaction function shall be normal during and after the test.

4.5.2.8 Open circuit

4.5.2.8.1 Single-line open circuit

Perform the test in accordance with 5.3.5.1.8.1. After the test, the transaction function of ETC OBU shall be normal.

4.5.2.8.2 Multi-line open circuit

Perform the test in accordance with 5.3.5.1.8.2. After the test, the transaction function of ETC OBU shall be normal.

4.5.2.9 Short circuit protection

Perform the test in accordance with 5.3.5.1.9. After the test, the transaction function of ETC OBU shall be normal.

4.5.2.10 Insulation resistance

Perform the test in accordance with 5.3.5.1.10. The insulation resistance of ETC OBU shall be greater than 10 M ohm. After the test, the transaction function of ETC OBU shall be normal.

4.5.3 Dustproof performance

The protection level of ETC OBU that is installed in the passenger compartment shall meet the requirements of IP5X in GB/T 30038-2013. Perform the test in accordance with 5.3.5.2. After the test, the transaction function of ETC OBU shall be normal.

Perform the test in accordance with 5.3.5.4.3. After the test, no damage is allowed, and the transaction function of ETC OBU shall be normal.

4.5.5.5 High temperature operation

Perform the test in accordance with 5.3.5.4.4. During and after the test, no damage is allowed, and the transaction function of ETC OBU shall be normal.

4.5.5.6 Temperature gradient

Perform the test in accordance with 5.3.5.4.5. During and after the test, no damage is allowed, and the transaction function of ETC OBU shall be normal.

4.5.5.7 Rapid temperature change of specified transition time

Perform the test in accordance with 5.3.5.4.6. After the test, no damage is allowed, and the transaction function of ETC OBU shall be normal.

4.5.5.8 Temperature cycle of specified rate of change

Perform the test in accordance with 5.3.5.4.7. During and after the test, no damage is allowed, and the transaction function of ETC OBU shall be normal.

4.5.5.9 Damp heat cycle

Perform the test in accordance with 5.3.5.4.8. During and after the test, no damage is allowed, and the transaction function of ETC OBU shall be normal.

4.5.5.10 Damp heat in steady state

Perform the test in accordance with 5.3.5.4.9. No damage is allowed; during the last 1 h of the test and after the test, the transaction function of ETC OBU shall be normal.

4.5.5.11 Solar radiation

For the ETC OBU that is installed in the direct sunlight in the passenger compartment, perform the test in accordance with 5.3.5.4.10. After the test, the surface shall be free from fall-offs, cracks and bubbles.

The ETC OBU that is installed in the passenger compartment where it is not exposed to direct sunlight is not required.

4.5.6 Chemical load

Perform the test in accordance with 5.3.5.5. After the test, no damage is allowed, and the transaction function of ETC OBU shall be normal.

4.5.7 Electromagnetic compatibility

1 -- wave-transmitting material;

2 -- observation window; d1 -- the distance between the outer surface of the wave-transmitting material and the ETC RSU simulator antenna, in meters (m); d2 -- the distance between the ETC OBU receiving antenna and the inner surface of the wave-transmitting material, in meters (m).

5.3.3 ETC RSU simulator

See Appendix A for ETC RSU simulator parameters.

The ETC RSU simulator of other on board payment electronic units shall also meet the requirements of corresponding standards.

5.3.4 Transaction test steps

Place the tested ETC OBU in a prescribed test environment; at the same time of conducting environmental assessment, test the tested ETC OBU transaction function through the ETC RSU simulator. The transaction test steps are as follows:

a) The ETC RSU simulator initiates a transaction process every 3 s (if it's performing a durability test, the ETC RSU simulator initiates a transaction process every 6 s; the durability test is shown in Appendix B; the durability test calculation model is shown in Appendix C); if the tested ETC OBU response is correct, it is deemed to have completed a transaction.

b) Repeat step a) to perform continuous tests; monitor the transaction completion status.

If it is necessary to perform the transaction function test after the environmental assessment test, step a) shall be continued for 20 times for the continuous test after the environmental assessment test is completed; the status of transaction completion shall be monitored.

5.3.5 Environmental assessment test procedure

5.3.5.1 Electrical performance test

5.3.5.1.1 DC working voltage test

ETC OBU uses the working mode 3.2 that is defined by GB/T 28046.1-2011; it first adjust the DC regulated power supply voltage to UN; then, it gradually adjust

5.3.5.3.1 Mechanical vibration test

The ETC OBU simulates the installation method on the vehicle to fix on the vibrating table. It uses the working mode 3.2 that is defined by GB/T 28046.1-2011, and performs the test in accordance with the method of 4.1.2.4.2 in GB/T 28046.3-2011.

5.3.5.3.2 Mechanical shock test

ETC OBU uses the working mode 3.2 that is defined in GB/T 28046.1-2011 and performs the test according to the method of 4.2.2.2 in GB/T 28046.3-2011.

5.3.5.3.3 Free fall test

ETC OBU uses the working mode 1.1 that is defined in GB/T 28046.1-2011 and performs the test according to the method of 4.3.2 in GB/T 28046.3-2011. After the test, perform the test in accordance with the working mode 3.2 that is defined in GB/T 28046.1-2011.

5.3.5.4 Environmental weatherability test

5.3.5.4.1 Low temperature storage test

ETC OBU uses the storage temperature lower limit of Table 2 and the working mode 1.1 that is defined by GB/T 28046.1-2011, and performs the test according to the method of 5.1.1.1.2 in GB/T 28046.4-2011. After the test, let it stand for 2 h to return to normal temperature, and perform the test in accordance with the working mode 3.2 that is defined in GB/T 28046.1-2011.

5.3.5.4.2 Low temperature operation test

ETC OBU uses Tmin and the working mode 3.2 that is defined by GB/T 28046.1-2011, and performs the test according to the method of 5.1.1.2.2 in GB/T 28046.4-2011. After the test, let it stand for 2 h to return to normal temperature, and perform the test in accordance with the working mode 3.2 that is defined in GB/T 28046.1-2011.

5.3.5.4.3 High temperature storage test

ETC OBU uses the storage temperature upper limit of Table 2 and the working mode 1.1 that is defined by GB/T 28046.1-2011, and performs the test according to the method of 5.1.2.1.2 in GB/T 28046.4-2011. After the test, let it stand for 2 h to return to normal temperature, and perform the test in accordance with the working mode 3.2 that is defined in GB/T 28046.1-2011.

5.3.5.4.4 High temperature operation test

the test for 600 h according to method 2 of GB/T 1865-2009 and cycle C in Table 3.

5.3.5.5 Chemical load test

ETC OBU that is installed in the passenger compartment uses the working mode 1.1 that is defined in GB/T 28046.1-2011, selects reagents and exposure conditions according to the installation position code [B] in Table 1 of GB/T 28046.5-2013, and performs the test according to the wetting method in Table 2 and the procedure of 4.8. After the test, perform the test in accordance with the working mode 3.2 that is defined in GB/T 28046.1-2011.

5.3.5.6 Electromagnetic compatibility test

5.3.5.6.2 Test of immunity to electrical disturbances from conduction and coupling

5.3.5.6.1 Immunity test

to electrical disturbances from electrostatic discharge

5.3.5.6.1.1 Unpowered electronic module

ETC OBU uses the working mode 1.1 that is defined in GB/T 28046.1-2011 and performs the test according to the test voltage requirement that the test severe level of category 1 in Table C.1 and Table C.2 of Appendix C of GB/T 19951-2019 is not lower than L3 and the method that is specified in Chapter 9. After the test, perform the measurement in accordance with the working mode 3.2 that is defined in GB/T 28046.1-2011.

5.3.5.6.1.2 Powered electronic module

ETC OBU uses the working mode 3.2 that is defined in GB/T 28046.1-2011 and performs the test according to the test voltage requirement that the test severe level of category 1 in Table C.1, Table C.2 and Table C.3 of Appendix C of GB/T 19951-2019 is not lower than L3 and the method that is specified in Chapter 8.

5.3.5.6.2.1 Immunity to electrical transient conduction along power lines

ETC OBU uses the working mode 3.2 that is defined in GB/T 28046.1-2011, and performs the test according to the immunity test level that is specified in Table 3, the method of 5.8 in GB 34660-2017, and the method of pulse 5a/5b of GB/T 21437.2-2008.

5.3.5.6.2.2 Electrical transient immunity by capacitive and inductive

coupling via lines other than power lines […]