 Combustion analysis is the main process in achieving a better performance and higher environmental sustainability in internal combustion engines. The pressure-indication of all engine cylinders has increasingly developed into a standard configuration in order to develop and safely verify even small improvements.
For a measurement set up with many channels, not only must the connection of the pressure sensors to the amplifier channels conform to the channel organization, but also the right parameterization of the individual sensors in the chain must be regarded. However, no matter how much care is taken, there is no information as to whether the specifications of the pressure sensors can still be maintained or if the calibration interval has already been exceeded.
AVL and Piezocryst have therefore given themselves the task of integrating a sensor identification system into pressure sensors for combustion analysis, without changing the sensor size or the approved connection concept.
The key is a special crystal element implemented into the back area of the sensors.
The crystal elements are surface acoustic wave devices, so called SAW elements where each element has a unique structure like a fingerprint. To read the sensor ID, an electromagnetic pulse created by the piezo-amplifier is transmitted into the SAW element via the sense line. The reflected signal shows a characteristic frequency distribution, which depends on the structure of the crystal surface. The generated sensor ID is handed over to the AVL Data Management.
With the help of AVL Data Management, the right calibration data will automatically be parameterized with the appropriate amplifier channel. On customer demand, sensor-specific data like the operating time can be actively managed.
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