Patent application number | Description | Published |
20100037592 | METHOD AND DEVICE FOR DIAGNOSING AN EXHAUST GAS CATALYTIC CONVERTER - A first exhaust gas sensor signal (vls_up) of a first exhaust gas sensor (AS | 02-18-2010 |
20100037676 | METHOD AND DEVICE FOR ESTIMATING AN EMISSION OF AT LEAST ONE EXHAUST GAS COMPONENT - An exhaust-gas sensor signal (vls_down) of an exhaust-gas sensor that is disposed in an exhaust gas train downstream of at least one first catalytic converter volume (V | 02-18-2010 |
20120031378 | METHOD AND DEVICE FOR OPERATING AN INJECTION VALVE - In a method for operating an injection valve having a longitudinal axis, an injection needle, a control valve and an actuator embodied as a solid body actuator, wherein the actuator acts on the control valve and the control valve acts on the injection nozzle, various pre-defined quantities of electrical energy are supplied to the actuator in a plurality of adaptation flows in order to modify an axial length of the actuator. This electrical energy is defined such that an axial position of the injection nozzle remains unchanged. In correlation with the respective adaptation flow, and following the energy supply associated with the respective adaptation flow, a first and second voltage value are detected and a voltage differential value is then determined which is compared with a pre-defined threshold value and, on the basis of the comparison, at least one control of the actuator is adapted to the injection of fluid. | 02-09-2012 |
20120036938 | METHOD AND DEVICE FOR DETERMINING A PRESSURE IN A HIGH-PRESSURE ACCUMULATOR - An injection valve is hydraulically coupled to a high-pressure accumulator in order to supply a fluid. The injection valve has a longitudinal axis, an injection needle, and an actuator. The actuator is designed to act on the injection needle. A pre-defined amount of electrical energy is supplied to the actuator in order to modify an axial length of the actuator in such a way that the injection needle moves out of the closed position. Once the pre-defined amount of electrical energy has been supplied, a first voltage value and a second voltage value are detected and/or determined by the actuator at respectively different pre-defined moments. On the basis of the first and second voltage values, a differential voltage value is determined, on the basis of which a first pressure is determined, which represents a pressure in the high-pressure accumulator. | 02-16-2012 |
20120101709 | METHOD AND APPARATUS FOR OPERATING AN INTERNAL COMBUSTION ENGINE - In a method and the corresponding apparatus for operating an internal combustion engine with a plurality of cylinders (Z | 04-26-2012 |
20130066538 | ADAPTIVE IDLE STROKE COMPENSATION FOR FUEL INJECTION VALVES - A method is provided for operating an internal combustion engine having an injection system comprising at least one injector indirectly driven by means of an actuator, and a high pressure accumulator. According to the method, the actuator of the at least one injector has electrical test pulses of iteratively increasing energy continuously applied thereto, and the idle stroke of the actuator is continuously determined by hydraulic and/or electric means. Upon detecting a change in the idle stroke, a corresponding correction of the injection time of the injector is carried out. | 03-14-2013 |
20130152902 | Method for Adapting the Injection Characteristic of an Injection Valve - A method for adapting the injection characteristic of a fuel injection valve of an internal combustion engine to production-related tolerances is described. In the method, an injection quantity correction value is determined from the deviation of the idle travel and the deviation of the injection quantity of the injection valve before the operating phase of the injector. This injection quantity correction value is used to determine the injection-specific deviation of the injection quantity during the operating phase at the start of the operating phase of the injector in conjunction with the current deviation of the idle travel which is determined in the system. The injector-specific deviation of the injection quantity which is determined is used to correct the injection characteristic. As a result, changes in the injection quantity of an injector can be detected and corrected particularly precisely on the basis of production tolerances. | 06-20-2013 |
20130327301 | Injection Device - An injection device for an internal combustion engine includes a piezo actuator for moving a valve piston, and a control unit for actuating the piezo actuator. The control unit supplies electrical pulses having different pulse energy to the piezo actuator and determines a return stroke between the piezo actuator and valve piston or a time delay caused by the return stroke. The control unit selects the pulse energies such that a maximum excursion of a movement of the piezo actuator caused by at least one pulse is smaller than the return stroke, whereas a maximum excursion of a piezo actuator movement caused by another pulse(s) is greater than the return stroke, after each of the pulses detects a frequency spectrum of a voltage signal at the piezo actuator during the movement caused by the respective pulse, and determines the return stroke or time delay based on these frequency spectra. | 12-12-2013 |
20140012485 | Method for Determining the Opening Point in the Time of a Fuel Injector - A method for determining the opening point in time of a control valve having a coil drive of an indirectly driven fuel injector for an internal combustion engine of a motor vehicle may include: detecting the time curve of the current intensity of a current flowing through the coil drive, determining a current integral with respect to the detected current intensity as a function of the time and starting from a defined initial time, and determining a time at which the current integral reaches at least a predefined current integral reference value, wherein the determined time is the opening point in time of the control valve. A corresponding device and a computer program for determining the opening point in time of a control valve of an indirectly driven fuel injector are also disclosed. | 01-09-2014 |