Telematics includes data acquisition, global positioning systems, computers, digital imaging and wireless communication technologies. By using standard wireless application protocol (WAP) 2.4, or 5.8 GHz bandwidth, test vehicles can send detailed data directly to the engineer's office for real-time. analysis.
The key to these technologies is to install sensors and systems into the vehicle and perform detailed data analysis. Modern data acquisition systems can perform accurate data analysis.
European manufacturers have been using the Controller Area Network (CAN) bus for data exchange for many years, and now manufacturers in the United States and Japan are also using this technology.
From the point of view of data acquisition, most of the automotive operating performance has been established in automotive computer systems. In the test installation, communication with the CANbus system can greatly reduce the sensor additional data. Such as comfort control functions, such as electric windows.
In the past, due to the need for complex cabling, much of the information will be ignored. In the CANbus system of the vehicle, each engine and switch has its own network address, so that the data acquisition system can obtain a lot of key information from it.
The data acquisition system selects the required digital data from the CANbus system and feels as if it were acquired from a conventional sensor. In addition, CANbus rings can use semi-automatic sensors to return data to the engine management unit and back to the data acquisition system.
Modern vehicle testing uses a variety of force sensors, strain gauges, pressure sensors, displacement sensors, and accelerometers to collect data. Most sensors, especially life estimation, are based on strain and inductance principles.
Strain gages are a very cheap and reliable technology, easy to install and very suitable for mobile testing. But for mobile data acquisition, due to use in harsh environments, it needs to have a higher degree of protection against dust, water and other sensors .
Data acquisition systems are very important for real-time mobile data acquisition. More channels are needed, and sensors from different manufacturers are collected. The data acquisition system will also be able to acquire data from both GPS and digital video. It will also work with many test software.
In order to realize the efficiency of the data acquisition system, it is necessary not only to cooperate with the CANbus, but also to require a high-precision analog-to-digital converter so that many dynamic signals can be processed without measuring range adjustment.
The data acquisition system should be able to store data streams and process digitized signals. In addition, scalability is also important because engineers must perform a variety of complex tests. And there must be data compression so that larger data files can be processed.
The other thing to consider is the chassis. The independent system is more convenient to use.
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