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Method for controlling piezo-injector for fuel injection into diesel engines mounted in e.g. passenger cars, involves determining quality of piezo injector from characteristic size of quality parameter for evaluating
Method for controlling piezo-injector for fuel injection into diesel engines mounted in e.g. passenger cars, involves determining quality of piezo injector from characteristic size of quality parameter for evaluating
The method involves controlling a needle valve (230) with a piezo actuator (210) of a piezo-injector (200). A voltage signal is determined by the piezo-actuator as a measured variable. The operation and/or the closing time of the needle valve are determined by an evaluation of the measured variable. The measured variable is evaluated to determine a characteristic size for monitoring and/or optimizing a drive (215) of the piezo-injector. The quality of the piezo injector is determined from the characteristic size of a quality parameter for evaluating. Independent claims are included for the following: (1) a processing unit; (2) a computer program for controlling a piezo-injector for fuel injection into engines; and (3) a machine-readable storage medium storing program for controlling a piezo-injector for fuel injection into engines.
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