专利名称：METHOD AND DEVICE FOR MONITORING A
COMBUSTION PROCESS
发明人：HANGAUER, WILFRIED,LINK,
HANS,LOCHSCHMIED, RAINER
申请号：EP07788262.9申请日：20070806公开号：EP2047235A1公开日：20090415
摘要：A method for determining the functional state of a piezo injector of an internalcombustion engine, wherein the input variables of a control loop for the fuel injectionvoltage and the charge,characterized in that– starting from a new capacity and the laststored for the measured capacitance values of the piezoelectric injector further
capacitance profile with the aid of a mathematical approximation method) is calculated,–an imminent failure of the piezo injector is detected in that a measured capacitancevalues are outside of a first upper and lower tolerance range about the calculatedcapacitance profile is located, and– the injector is immediately switched off when themeasured capacitance value outside of a second upper and lower threshold area aroundthe calculated capacitance profile, wherein the threshold region with the tolerance rangeincludes.
申请人：SIEMENS BUILDING TECHNOLOGIES HVAC PRODUCTS GMBH
地址：Berliner Ring 23 76437 Rastatt DE
国籍：DE
代理机构：Weise, Wolfgang
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