Example 2: Knock Sensor Test System

The knock sensor test system is mainly composed of a console and a control cabinet.

In the principle of the test system, the vibration test adopts the relative method to realize the sensitivity test of the arbitrary frequency point in the range of 3000~40000Hz of the automobile knocking sensor, and can detect the capacitance and the insulation resistance. The test system uses a PXI architecture for control and signal acquisition via PXI modular instruments or GPIB instruments.

The knock sensor has the same standard requirements as the wheel speed and position sensor, but the test principle is the same, except that the shape and test parameters of the sensor will vary with the sensor. The test installation of the knock sensor is generally mounted on the vibrating table by M8 bolts, so the difference of the sensor head can be ignored, and different adapter interfaces are used for different interfaces to realize quick changeover.

The interface adapter is equipped with an identification circuit. When the test parameters are configured through the test program, the program automatically calls the test parameters corresponding to the interface adapter to prevent misoperation.

Example 3: T-MAP Sensor Test System

The T-MAP sensor, the intake manifold pressure-temperature sensor, can assist in adjusting the fuel injection amount and thus controlling the air-fuel ratio. It is an important sensor on the vehicle. The final inspection equipment needs to perform capacitance detection, NTC (thermistor) detection, Ramp (ramp) test, Leakage (leakage) test, etc. on the sensor.

The T-MAP test needs to be carried out during the pressure change process, and the test time is long, which is difficult to meet the requirements of mass production. Therefore, the system designed a 3-station parallel test method, which takes up test hardware and pneumatic system resources in a time-sharing manner, improves work efficiency, and reduces hardware costs.

The action during the test is driven by the cylinder and is completed automatically. The operator only needs to put the DUT into the fixture. After the test is completed, the workpiece is transferred from the conveyor to the next station.

Considering the scalability of the system, the part that changes with the measured object adopts the modularization and interface standardization design, and the corresponding test module can be added if the product is not compatible.

In addition, the system acts as a final inspection device and needs to share data with other production equipment. On the one hand, the necessary parameters required for the system test need to be obtained from the previous test equipment before the test; on the other hand, the test data needs to be placed on the server for use by other systems. The automatic conveyor belt and I/O signals are added structurally and electrically to achieve automatic transfer of workpieces between the front station and subsequent coding equipment. Therefore, this equipment has been organically integrated with other equipment on the production line to form a production and test line.

Conclusion

Flexible testing technology is a master of a variety of technologies, focusing on meeting the needs of different production applications. The automotive sensor test system based on flexible test technology embodies the design idea of ​​structural modularization, electrical interface standardization and software componentization, and organically integrates various technologies such as mechatronics technology, virtual instrument technology and software technology to make test technology. The three advantages of flexibility, adaptability and scalability are fully reflected.

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