Patent application number | Description | Published |
20080265805 | Method and Apparatus for Operation of a Piezo-Actuator - A piezo-actuator is actuated in a first operating mode (B | 10-30-2008 |
20100063709 | METHOD AND DEVICE FOR OFFSETTING BOUNCE EFFECTS IN A PIEZO-ACTUATED INJECTION SYSTEM OF AN INTERNAL COMBUSTION ENGINE - The invention relates to a method and a device for offsetting bounce effects in a piezo-actuated injection system of an internal combustion engine using a control valve actuated by a piezoelectric actuator. The inventive method comprises the following steps: detecting an actual bounce behavior of the control valve, and determining and offsetting a deviation between the actual bounce behavior and a desired bounce behavior of the control valve, thereby generating an actuation information for the control valve which influences a speed characteristic of a needle of the control valve. The invention also relates to a device for carrying out the inventive method. | 03-11-2010 |
20100223985 | Method And Device For Dynamically Determining A Segment For An Angular Spread, Inside Which Fuel is Injected Into An Internal Combustion Engine - In a method and a device for dynamically determining a segment for an angular spread, fuel is injected into an internal combustion engine and the useful injection range (IRu) and/or the relative position of the segment comprising the angular spread, in which a fuel injection can be carried out especially during a multiple injection, are variable. A corresponding adaptation of the useful injection range (IRu) can advantageously trigger a subsequent injection impulse, as required, for example, for a regeneration module of a diesel particle filter. The adaptation is carried out according to an operating parameter, for example according to the rotational speed gradient. | 09-09-2010 |
20100268440 | METHOD AND DEVICE FOR THE CALIBRATION A PIEZO-ACTUATOR THAT IS ACTUATED IN A MOTOR VEHICLE FOR DRIVING A SWITCHING VALVE - In a method for calibration, a piezo-actuator ( | 10-21-2010 |
20100288238 | METHOD AND DEVICE FOR FORMING AN ELECTRIC CONTROL SIGNAL FOR AN INJECTION IMPULSE - In a method or a device for forming an electric control signal for an injection impulse of a position-controlled fuel injector, particularly of a common-rail or pump-nozzle injection system, he course of the electric control signal can be selected freely in regard to the pulse edges (injection rate changes Q), the holding period (Δt) and the injection rate (Q). This offers the advantage that the combustion process can be better optimized with respect to low emissions, low consumption and for meeting tightened legal regulations. | 11-18-2010 |
20130133748 | METHOD AND DEVICE FOR DETERMINING THE ACTUAL START OF INJECTION OF A PIEZO FUEL INJECTION VALVE - A method for determining the actual start of injection is performed by an actuating device for a piezo fuel injection valve and includes the following steps. First, a test injection is carried out with such a short actuation duration that a start of shut-off takes place at a time so early that the nozzle needle does not reach the open end position. Said time is predefined by the actuation and is therefore precisely known. Next, the closing time of the nozzle needle is then determined by measurement and evaluation of an electrical variable of the piezo direct drive. Once the closing time and the time of the start of shut-off are known, the actual start of injection is calculated back from the closing time via the start of shut-off. This permits an adequately precise determination of the actual injection quantity in almost every operating state of the internal combustion engine. | 05-30-2013 |
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 |
20140034747 | Method For Detecting A Nozzle Chamber Pressure In An Injector And Injection System - A method is disclosed for detecting a nozzle chamber pressure in an injector that includes a closure element for opening and closing an injection opening, at least one actuator which directly actuates the closure element, and at least one sensor for measuring a state, which is dependent on the nozzle chamber pressure, of the closure element, wherein at least one measurement variable which is dependent on the state is detected by means of the sensor, and wherein a deviation of the measurement value from a predefined value is determined. An injection system for carrying out such method is also disclosed. | 02-06-2014 |
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 |
20140346244 | Control Method For An Injection Valve And Injection System - A control method for a fuel injection valve for an internal combustion engine is disclosed, wherein at least one control signal for actuating a drive of the injection valve is generated in recurring injection cycles and as a function of a target stroke height of a closing element of the injection valve, wherein the drive is actuated by the control signal to lift the closing element to the target stroke height and the closing element is lifted to an actual stroke height by means of the drive, wherein at least one measured parameter correlated with the actual stroke height is captured and the actual stroke height is determined as a function of said at least one measured parameter, wherein the control signal is generated in at least one of the subsequent injection cycles as a function of a deviation of the actual stroke height from the target stroke height. | 11-27-2014 |