Patent application number | Description | Published |
20090309455 | METHOD FOR DETERMINING A FUNCTIONAL STATE OF A PIEZOELECTRIC INJECTOR OF AN INTERNAL COMBUSTION ENGINE - A check is made to determine whether the capacitance value measured at a specific point in time corresponds to a capacitance value of a calculated further capacitance profile or the measured capacitance value is within two tolerance ranges. | 12-17-2009 |
20100024777 | Method for the localization of a fault location within a fuel injection system - In a method for localizing a fault location within a fuel injection system, when a critical fault is detected by the diagnostic function, a pulse or a series of pulses to the injectors is triggered by a control unit. By observing the voltage value and/or charge value at the injector, it is possible to localize the fault location within the fuel injection system. | 02-04-2010 |
20130226472 | Method for Monitoring the Condition of a Piezo Injector of a Fuel Injection System - A method for monitoring the condition of a piezoinjector of a fuel injection system is disclosed. The fuel injection is carried out in injection cycles, each of which comprises a filling phase, a holding phase, and an emptying phase. The discharge resistance is ascertained during the holding phase of the piezoinjector. Conclusions about the working order of the piezoinjector are drawn using the ascertained discharge resistance. | 08-29-2013 |
20130239929 | Method for Actuating a Piezo Injector of a Fuel Injection System - A method for actuating a piezoelectric actuator and a piezo injector of a fuel injection system having a nozzle needle which can be moved between the closed position and an open position by the piezoelectric actuator are disclosed. Current is applied to the piezoelectric actuator from a source for the duration of a charging time as a function of a required quantity of fuel, in order to move the nozzle needle into its opened position for a time period which is dependent on the required quantity of fuel. The charging time is selected according to the following relationships: t | 09-19-2013 |
20130333455 | Method For Monitoring The State Of A Piezoelectric Injector Of A Fuel Injection System - A method is disclosed for monitoring the state of a piezoelectric injector of the fuel injection system of an internal combustion engine, the piezoelectric injector having a piezoelectric actuator and a nozzle needle that can be moved by said piezoelectric actuator. The piezoelectric injector can be operated in a partial-stroke mode and a full-stroke mode. In the partial-stroke mode, the curve of an electrical parameter over time is recorded, the maximum value of the curve is determined, a constant parameter value that arises after the presence of the maximum value is determined, the duration between the presence of the maximum value and the reaching of the constant parameter value is determined, the difference between the maximum value and the constant parameter value is determined, and conclusions about the state of the piezoelectric injector are drawn on the basis of the determined duration and the determined difference. | 12-19-2013 |
20140007665 | Method For Determining The Force Conditions At The Nozzle Needle Of A Directly Driven Piezo Injector - A method is disclosed for determining the force acting on the nozzle needle of a directly driven piezo injector, in which an electrical voltage is built on the piezo actuator which drives the nozzle needle by means of a charging process. After the charging process has ended, the voltage at the piezo actuator is measured again. A voltage gradient is determined from consecutive voltage values. Conclusions of the force acting on the nozzle needle are drawn from the voltage gradients. | 01-09-2014 |
20140263692 | Method for Monitoring an Injection Fluid Quantity and Injection System for Injecting an Injection Fluid Quantity - A method for monitoring an injection fluid quantity, which is injected through an injection nozzle, includes opening and closing said injection nozzle by a closure element guided in one movement, detecting at least three characteristic points of the movement of the closure element at which the closure element is located at a certain position, and calculating the injection quantity from the at least three detected characteristic points. | 09-18-2014 |
20140326218 | Method For Determining A Position Of A Lock Element Of An Injection Valve For An Internal Combustion Engine - A method for determining a position of a lock element of an injection valve for an internal combustion engine includes moving the lock element in the direction of a locked position in a closing movement in order to lock the injection valve, subsequently measuring a closure time at which the lock element arrives in the locked position, determining a time difference between the closure time and a preceding starting time of the closing movement, and determining, based on the time difference, a position which the lock element has assumed at the starting time of the closing movement. | 11-06-2014 |