Continental Automotive Gmbh

Peter Matthias Ruβe

Hans-Jörg Wiehoff

Anselm Schwarte

Steffen Lehner

Nicolas Nozeran

Manfred Kramel

Robert Hoffman

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.

Control method for an injection valve and injection system

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.

Method for determining a position of a lock element of an injection valve for an internal combustion engine

An injection nozzle has a nozzle needle that suppresses metering of fluid in a closed position and otherwise allows the metering of fluid. Furthermore, the injection valve has a solid-state actuator that acts on the nozzle needle. A first operating phase is performed for a closing operation in a first operating mode, during which first operating phase the solid-state actuator is discharged to a predefined part charge. Furthermore, a second operating phase is performed, during which the solid-state actuator is operated as a sensor. An operating duration of the second operating phase is predefined such that the closed position of the nozzle needle is reached during the operating duration. A third operating phase is performed, during which the solid-state actuator is discharged further to a predefined reference state. In a second operating mode, the first and second operating phases are carried out and the third operating phase is omitted.

Method and device for operating an 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.

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Tegernheim, Germany

Peter Matthias Ruβe