![]() ![]() In contrast to coil-operated injectors, it is not necessary to supply a continuous holding current to the piezo actuator. If, on the other hand, the value of the leakage resistance is less than the predetermined threshold value, then it is recognized that the piezo injector is no longer functioning in a fault-free manner, in particular, that the value of the leakage resistance of the piezo injector has, as a result of environmental and/or aging influences, dropped to such an extent that there is the risk of a short circuit or of a voltage flashover.Ī piezo injector of a fuel injection system comprises a piezo actuator that is capable of storing the charge being provided. If the leakage resistance has a higher value that a predetermined threshold value, then it is recognized that the piezo injector is functioning in a fault-free manner. ![]() This new information is the leakage resistance of the piezo injector. These variables are linked together in new combinations in such a manner that new information is obtained that indicates the condition of the piezo injector. F02D41/221- Safety or indicating devices for abnormal conditions relating to the failure of actuators or electrically driven elementsĪdvantages of certain embodiments include, for example, the fact the condition of the piezo injector can be monitored using variables that are often already available in known injection systems and are used for other purposes.F02D41/22- Safety or indicating devices for abnormal conditions.for controlling currents in command coils for controlling piezo-electric injectors for controlling currents in command coils F02D41/00- Electrical control of supply of combustible mixture or its constituents.testing injection timing Cleaning of fuel-injection apparatus F02M65/00- Testing fuel-injection apparatus, e.g.F02M- SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF.F02- COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS.F- MECHANICAL ENGINEERING LIGHTING HEATING WEAPONS BLASTING.Assignors: CONTINENTAL AUTOMOTIVE GMBH Status Active legal-status Critical Current Adjusted expiration legal-status Critical Links Assignors: HOFFMANN, ROBERT Publication of US20130226472A1 publication Critical patent/US20130226472A1/en Application granted granted Critical Publication of US9587610B2 publication Critical patent/US9587610B2/en Assigned to Vitesco Technologies GmbH reassignment Vitesco Technologies GmbH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Priority claimed from DE102010043150.8 external-priority Application filed by Continental Automotive GmbH filed Critical Continental Automotive GmbH Assigned to CONTINENTAL AUTOMOTIVE GMBH reassignment CONTINENTAL AUTOMOTIVE GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Original Assignee Continental Automotive GmbH Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) ( en Inventor Robert Hoffmann Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Active, expires Application number US13/882,483 Other versions US20130226472A1 Google Patents Method for monitoring the condition of a piezo injector of a fuel injection systemĭownload PDF Info Publication number US9587610B2 US9587610B2 US13/882,483 US201113882483A US9587610B2 US 9587610 B2 US9587610 B2 US 9587610B2 US 201113882483 A US201113882483 A US 201113882483A US 9587610 B2 US9587610 B2 US 9587610B2 Authority US United States Prior art keywords piezo injector holding phase phase voltage during Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US9587610B2 - Method for monitoring the condition of a piezo injector of a fuel injection system US9587610B2 - Method for monitoring the condition of a piezo injector of a fuel injection system ![]()
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