METHOD FOR EVALUATING CHARACTERISTIC VALUES OF PIEZO-MECHANICAL SYSTEMS

摘要

In order to diagnose coupled piezo-mechanical systems, methods are used which utilise the electric characteristic curves of the piezo-element (11) contained in the piezo-mechanical systems. These electric characteristic curves contain information on the mechanical state of the whole piezo-mechanical system and this information can be interpreted by appropriate evaluation methods. This makes it possible to carry out a diagnosis which enables functional disturbances or failures of the piezo-mechanical system to be recognised (for example, the wear or failure of particular components). An important field of application is the diagnosis of fuel injectors controlled by piezo-actuators.