Method for evaluating characteristic values of piezo-mechanical systems
AssigneeSiemens Aktiengesellschaft
InventorsRandolf Mock, Eric Chemisky, Andreas Kappel
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Abstract
For diagnosing coupled piezo-mechanical systems, methods are used which utilize electrical characteristic curves of the piezo-element that is contained in the piezo-mechanical systems. These electrical characteristic curves contain information about the mechanical condition of the overall piezo-mechanical system, which can be interpreted by suitable evaluating methods. It is thus possible to perform a diagnosis in which malfunctions and failures of the piezo-mechanical system can be detected (e.g. wear or failure of particular components). An important field of application is the diagnosis of fuel injectors which are controlled via piezo-actuators.
Claims15
A method for diagnosing a piezo-mechanical system comprising the steps of:
- providing at least one piezo-element and a mechanical system controlled by the piezo-element;
- comparing an electrical piezo-signal tapped at the piezo-element to an electrical signal that controls the piezo-element;
- and
- determining a condition of the piezo-mechanical system from a deviation of these two signals from one another.
A method for diagnosing a piezo-mechanical system which contains at least one piezo-element and a mechanical system controlled by the piezo-element,
- comparing an electrical piezo-signal derived from the piezo-element to an electrical signal that controls the piezo-element;
- and
- determining a condition of the piezo-mechanical system from a deviation of these two signals from one another.
Dependencies are inferred from the claim text.