GB/T 41484-2022Automotive ultrasonic sensor assembly (English PDF)

3.1 Ultrasonic sensor assembly

In-vehicle electronic devices used to transmit, receive and process ultrasonic signals and obtain information such as target distance and orientation.

NOTE: The ultrasonic sensor assembly can be divided into individual sensors or the integration of sensors and control units.

3.2 Standard test tube

Standard test setup for reflected ultrasonic signals.

3.3 Ring time

The inertia damping decay time of the ultrasonic drive signal emitted by the assembly.

3.4 Field of view

The three-dimensional space area that the assembly can detect under specified conditions.

3.5 Detection coverage rate

The effective field of view of the assembly as a percentage of the required field of view.

3.6 Resolution

The ability of the assembly to distinguish the minimum change distance of the target.

3.7 Starting signal

The command signal used to start the work of the assembly according to the established communication protocol.

3.8 Transceiver device

A test device used to send a start signal to the assembly or send a data frame according to the established communication protocol, and receive the distance, azimuth and other signals returned by the assembly, and give instructions by auditory or visual means.

5.1 Appearance and structural requirements

5.1.1 Appearance

Test according to 6.2. The appearance of the assembly shall meet the following requirements:

a) The outer surface of each component shall be smooth and flat, without dents, scratches, cracks, deformation, burrs, mildew and other defects;

b) The surface of metal parts shall have a uniform protective layer, without blistering, cracking, peeling, corrosion and mechanical damage;

NOTE: For the assembly with overvoltage protection function, the output signal in the test shall be determined through negotiation between the supplier and the purchaser.

5.4.2.4 Superimposed AC Voltage

Test according to 6.5.2.4. During the test and after the test, the functional state shall meet the requirements of 5.4.1.1.

5.4.2.5 Slow drop and slow rise of supply voltage

Test according to 6.5.2.5. During the test, when the voltage is at USmin and after the test, the functional state shall meet the requirements of 5.4.1.1.

5.4.2.6 Slow drop and fast rise of supply voltage

Test according to 6.5.2.6. During the test, when the voltage is within the range of USmin~USmax and after the test, the functional state shall meet the requirements of 5.4.1.1.

5.4.2.7 Supply voltage transients

5.4.2.7.1 Instantaneous drop in voltage

Test according to 6.5.2.7.1. During the test, when the voltage is at USmin and after the test, the functional state shall meet the requirements of 5.4.1.1.

5.4.2.7.2 Reset performance to voltage dips

Test according to 6.5.2.7.2. When the voltage is restored to USmin during the test and after the test, the functional state shall meet the requirements of 5.4.1.1.

5.4.2.7.3 Startup feature

Test according to 6.5.2.7.3. During the test, when the voltage is at UN and after the test, the functional state shall meet the requirements of 5.4.1.1.

5.4.2.7.4 Load dump

Test according to 6.5.2.7.4. During the test, when the voltage is within the range of USmin~USmax and after the test, the functional state shall meet the requirements of 5.4.1.1.

5.4.2.8 Reverse voltage

Test according to 6.5.2.8. The functional state after the test shall meet the requirements of 5.4.1.1.

5.4.6.6 Damp heat requirements

5.4.6.6.1 Damp heat cycle

Test according to 6.5.6.5.1. During the test, the functional state installed inside the passenger compartment shall meet the requirements of 5.4.1.1. The appearance after the test shall meet the requirements of 5.1.1. The functional state shall meet the requirements of 5.4.1.1. Assemblies or units installed outside the vehicle are not required.

5.4.6.6.2 Combined temperature/humidity cycle

Test according to 6.5.6.5.2. During the test, the functional state installed outside the vehicle shall meet the requirements of 5.4.1.1. The appearance after the test shall meet the requirements of 5.1.1. The functional state shall meet the requirements of 5.4.1.1.

Assemblies or units installed inside the passenger compartment are not required.

5.4.6.6.3 Steady-state damp heat

Test according to 6.5.6.5.3. The functional state of the last 1h in the test shall meet the requirements of 5.4.1.1. The appearance after the test shall meet the requirements of 5.1.1. The functional state shall meet the requirements of 5.4.1.1.

5.4.7 Ice water shock

Test according to 6.5.7. After the test, the appearance of the assembly or unit installed outside the vehicle shall meet the requirements of 5.1.1. The functional state shall meet the requirements of 5.4.1.1.

Assemblies or units installed inside the passenger compartment are not required.

5.4.8 Salt spray corrosion resistance

5.4.8.1 Corrosion

Test according to 6.5.8.1. After the test, the appearance of the assembly or unit installed outside the vehicle shall meet the requirements of 5.1.1. The functional state shall meet the requirements of 5.4.1.1.

There are no requirements for assemblies or units installed in the passenger compartment.

5.4.8.2 Penetration and functionality

Test according to 6.5.8.2. After the test, the appearance of the assembly shall meet the requirements of 5.1.1. The functional state shall meet the requirements of 5.4.1.1.

Figure 6 -- Schematic diagram of detection scene without obstacle

6.5.2 Electrical performance test

6.5.2.1 DC supply voltage

Arrange the test environment according to 6.5.1.1.1. DUT is tested in working mode B2. First adjust the voltage of the DC stabilized power supply to UN. Then gradually adjust the voltage to USmin to stabilize for 10min. Gradually adjust the voltage to USmax and stabilize for 10min. Carry out a functional state inspection during and after the test.

6.5.2.2 Quiescent sleep current

The DUT is in the working mode B1. The ammeter is connected to the power supply line for testing.

6.5.2.3 Overvoltage

6.5.2.3.1 At (Tmax-20°C)

Arrange the test environment according to 6.5.1.1.1. The DUT is tested in working mode B2. The DUT whose UN is 12V shall be tested according to the method in 4.3.1.1.2 of GB/T 28046.2-2019. The DUT whose UN is 24V shall be tested according to the method in 4.3.2.2 of GB/T 28046.2-2019. Carry out a functional state inspection during and after the test.

6.5.2.3.2 At room temperature

Arrange the test environment as in 6.5.1.1.1. The DUT is tested in operating mode B2.

The DUT whose UN is 12V shall be tested according to the method in 4.3.1.2.2 of GB/T 28046.2-2019. Carry out a functional state inspection during and after the test.

6.5.2.4 Superimposed AC voltage

Arrange the test environment according to 6.5.1.1.1. The DUT is tested in working mode B2. Test according to 4.4.2 Severity 1 in GB/T 28046.2-2019. Carry out a functional state inspection during and after the test.

6.5.2.5 Slow drop and slow rise of supply voltage

Arrange the test environment according to 6.5.1.1.1. The DUT is tested in operating mode B2. Test according to the method in 4.5.2 of GB/T 28046.2-2019. Carry out a functional state inspection during and after the test.

6.5.2.6 Slow drop and fast rise of supply voltage

Arrange the test environment according to 6.5.1.1.1. The DUT is tested in working mode B2. The test procedure is as follows:

a) In the falling stage, drop from USmax to 0V at a rate of (0.5±0.1)V/min;

b) In the rising stage, the voltage rises rapidly from 0V to USmax within 0.5s.

Carry out a functional state inspection during and after the test.

6.5.2.7 Supply voltage transients

6.5.2.7.1 Voltage dips

Arrange the test environment according to 6.5.1.1.1. The DUT is tested in working mode B2 according to the method in 4.6.1.2 of GB/T 28046.2-2019. Carry out a functional state inspection during and after the test.

6.5.2.7.2 Reset performance for voltage dips

Arrange the test environment according to 6.5.1.1.1. The DUT is tested in working mode B2 according to the method in 4.6.2.2 of GB/T 28046.2-2019. Carry out a functional state inspection during and after the test.

6.5.2.7.3 Startup characteristics

Arrange the test environment according to 6.5.1.1.1. The DUT is tested in working mode B2 according to the method of 4.6.3.2 Level II in GB/T 28046.2-2019. Carry out a functional state inspection during and after the test.

6.5.2.7.4 Load dump

Arrange the test environment according to 6.5.1.1.1. The DUT is tested in working mode B2 according to the method in 4.6.4.2 of GB/T 28046.2-2019. Carry out a functional state inspection during and after the test.

6.5.2.8 Reverse voltage

Arrange the test environment according to 6.5.1.1.1. The DUT is tested in working mode B2 according to the method in 4.7.2.3 of GB/T 28046.2-2019. After the test, carry out a functional state inspection.

6.5.2.9 Open circuit

6.5.2.9.1 Single wire open circuit

Arrange the test environment according to 6.5.1.1.1. The DUT is tested in working mode B2 according to the method in 4.9.1.2 of GB/T 28046.2-2019. After the test, carry out a functional state inspection.

6.5.2.9.2 Multi-wire open circuit

2021 and the methods of pulses 1, 2a, 2b, 3a, 3b. Carry out a functional state inspection during and after the test.

6.5.3.3 Immunity to electromagnetic radiation

Arrange the test environment according to 6.5.1.1.1 and 6.5.1.2. The DUT is tested in working mode B2, according to the anechoic chamber method, the immunity test strength of high current injection method in 4.7 of GB 34660-2017 and the method in 5.7.

6.5.3.4 Radio disturbance characteristics

6.5.3.4.1 Conducted emissions

The DUT is tested in working mode B2 according to the methods in 6.3 and 6.4 of GB/T 18655-2018.

6.5.3.4.2 Radiated emissions

The DUT is tested in working mode B2 according to the method in 6.5 of GB/T 18655- 2018.

6.5.4 Mechanical property tests

6.5.4.1 Mechanical vibration

Arrange the test environment according to 6.5.1.1.1. The DUT is tested in working mode B2 according to the method in 4.1.2.4.2 or 4.1.2.7.2 in GB/T 28046.3-2011. Carry out the ring time and functional state inspections during the test. After the test, carry out a functional state inspection.

6.5.4.2 Mechanical shock

Arrange the test environment according to 6.5.1.1.1. The DUT is tested in working mode B2 according to the method in 4.2.2.2 of GB/T 28046.3-2011. Carry out the ring time and functional state inspections during the test. After the test, carry out a functional state inspection.

6.5.4.3 Free fall

Arrange the test environment according to 6.5.1.1.1. The DUT is tested in working the method in 5.1.1.1.2 of GB/T 28046.4-2011 with the lower limit of storage temperature and working mode A1 in Table 4. After the test, let it stand for 2h and return to normal temperature. Carry out a functional state inspection for the DUT in the working mode B2.

6.5.6.1.2 Low temperature operation

Arrange the test environment according to 6.5.1.1.2. The DUT is tested with Tmin and working mode B2 according to the method in 5.1.1.2.2 of GB/T 28046.4-2011. During the test and after the test, after standing for 2h to restore normal temperature, carry out a functional state inspection.

6.5.6.2 High temperature test

6.5.6.2.1 High temperature storage

Arrange the test environment according to 6.5.1.1.2. The DUT is tested according to the method of 5.1.2.1.2 in GB/T 28046.4-2011 with the upper limit of storage temperature and working mode A1 in Table 4. After the test, let it stand for 2h and return to normal temperature. Carry out a functional state inspection for the DUT in the working mode B2.

6.5.6.2.2 High temperature operation

Arrange the test environment according to 6.5.1.1.2. The DUT is tested with Tmax and working mode B2 according to the method in 5.1.2.2.2 of GB/T 28046.4-2011. During the test and after the test, after standing for 2h to restore normal temperature, carry out a functional state inspection.

6.5.6.3 Temperature gradient

Arrange the test environment according to 6.5.1.1.2. The DUT is tested in the working mode B2 in the range of Tmin~Tmax, according to the method in 5.2.2 of GB/T 28046.4- 2011. During the test and after the test, after standing for 2h to restore normal temperature, carry out a functional state inspection.

6.5.6.4 Temperature cycling

6.5.6.4.1 Temperature cycling with specified rate of change

Arrange the test environment according to 6.5.1.1.2. The DUT is tested in the working mode B2 in the range of Tmin~Tmax according to the method in 5.3.1.2 of GB/T 28046.4- 2011. During the test and after the test, after standing for 2h to restore normal temperature, carry out a functional state inspection.

6.5.6.4.2 Rapid temperature change with specified transition time

The DUT is tested in the working mode A1 in the range of Tmin~Tmax, according to the method in 5.3.2.2 of GB/T 28046.4-2011. After the test, let it stand for 2h and return to normal temperature. Arrange the test environment according to 6.5.1.1.1. Carry out a functional state inspection for the DUT in the working mode B2.

6.5.6.5 Damp heat

6.5.6.5.1 Damp heat cycle

Arrange the test environment according to 6.5.1.1.2. The DUT is tested in working mode B2 according to the method in 5.6.2.2 of GB/T 28046.4-2011. During the test and after the test, after standing for 2h to restore normal temperature, carry out a functional state inspection.

6.5.6.5.2 Combined temperature/humidity cycle

Arrange the test environment according to 6.5.1.1.2. The DUT is tested in working mode B2 according to the method in 5.6.2.3 of GB/T 28046.4-2011. During the test and after the test, after standing for 2h to restore normal temperature, carry out a functional state inspection.

6.5.6.5.3 Steady-state damp heat

Arrange the test environment according to 6.5.1.1.2. The DUT is tested in working mode A2 according to the method in 5.7.2 of GB/T 28046.4-2011. In the last 1h of the test, the output signal is checked in the working mode B2. After the test, let it stand for 2h and return to normal temperature. Carry out a functional state inspection in the working mode B2.

6.5.7 Ice water shock

The DUT is tested in working mode B2 according to the method in 5.4.2.1 of GB/T 28046.4-2011. After the test, let it stand for 2h and return to normal temperature.

Arrange the test environment according to 6.5.1.1.1. Carry out a functional state inspection.

6.5.8 Salt spray corrosion resistance test

6.5.8.1 Corrosion

The DUT is tested in working mode A2 according to the method in 5.5.1.2 of GB/T 28046.4-2011. After the test check according to 6.2.1. Arrange the test environment according to 6.5.1.1.1. Carry out a functional state inspection for the DUT in the working mode B2.

6.5.8.2 Leakage and function

The DUT is tested in working mode B2 according to the method in 5.5.2.2 of GB/T 28046.4-2011. Arrange the test environment according to 6.5.1.1.1. After the test, carry