Mtu Friedrichshafen Gmbh

Ktu Friedrichshafen Gmbh

Andreas Kunz

Michael Willmann

Ralf Speetzen

Albert Kloos

Günther Schmidt

Jörg Remele

Johannes Baldauf

Christian Rehm

Michael Eckstein

Martin Schönle

Marc Hehle

Jörge Remele

Stefan Müller

Johannes Kech

Johanes Kech

A method for controlling an internal combustion engine with a common-rail system, in which a fuel quantity is computed from a measured fuel pressure distribution and in which the computed fuel quantity is set as the controlling value for controlling an injection. The fuel quantity is computed by measuring the pressure distribution (pE) of an individual accumulator, reproducing a modeled pressure distribution (pEMOD) according to the measured pressure distribution (pE) using a hydraulic model, and computing the fuel quantity from the hydraulic model.

Method for controlling an internal combustion engine

A method for controlling an internal combustion engine having a common rail system together with individual accumulators. A rotational speed-control deviation (dn) is determined from a target rotational speed (nSL) that represents the set point for an outer control loop to control the rotational speed, as well as from an actual rotational speed (nIST). A target torque (MSL) is determined from the rotational speed-control deviation (dn) via a rotational speed controller as a master controller. A target injection duration (SD(SOLL)) is determined from the target torque (MSL). The target duration injection (SD(SOLL)) represents the set point for an inner control loop for controlling cylinder-specific injection duration. An injection duration deviation is determined from the target injection duration (SD(SOLL)) and from an actual injection duration. A correcting variable is determined from the injection duration deviation via an injection duration controller as a follow-up controller, and an injection duration is determined from the correcting variable and the target injection duration for activating the injectors.

A method for detecting a preinjection in an internal combustion engine with a common-rail system, including individual accumulators, in which an individual accumulator pressure distribution is detected in a measurement interval and is used to determine an injection end of the main injection, in which a virtual injection start of the main injection is computed by a mathematical function as a function of the injection end, and in which the virtual injection start is set as the actual injection start of the main injection. With the preinjection activated, an actual injection delay for the main injection is determined as a function of the actual injection start, an injection delay deviation of a set injection delay from the actual injection delay is computed, and the injection delay deviation is used to determine whether a preinjection has occurred.

Method for detecting preinjection

In a method of controlling an internal combustion engine having a common rail fuel injection system including individual fuel storage chambers, wherein the pressure pattern of the fuel supplied to each injector can be determined and actual and virtual fuel injection ends and fuel injection begins are determined, the deviations from the desired fuel injection ends and from the fuel injection begins are calculated and the injectors are evaluated on the basis of the deviations and further control of the internal combustion engine is based on an evaluation of the fuel injectors.

Method of controlling an internal combustion engine

In a method of controlling an internal combustion engine wherein an injection begin is calculated depending at least on an actual engine speed and the injection begin is corrected, the injection begin correction is calculated from a deviation of a desired air mass flow from an actual air mass flow.

Method of controlling the injection begin of a fuel injection valve of an internal combustion engine

In a method for a torque-based control of an internal combustion engine wherein from an input value representing a desired engine power output a desired torque value is calculated, then the desired torque value is converted using a performance graph while taking another value into consideration to a first power output determining signal, which is then corrected by way of a relative efficiency and a power determining signal for controlling the drive torque is determined. The additional value corresponds to a relative friction moment, which is calculated from an actual deviation of the state of the engine from a standard state in which the relative friction moment is zero.

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Friedrichshafen, Germany

Andreas Kunz