Daimler Chrysler Ag

Daimler Ag

Frank Kirschbaum

Kurt Maute

Michael Virnich

Martin Schnabel

Madhukar Pandit

Rudiger Pfaff

Michael Mladek

Gerhard Muenkel

Lorenzo Matassini

Guenter Stoehr

Hans Gander

Alfred Frommelt

Heiko Moeckel-Lherbier

Simon Binder

Kristina Hellstroem

Karsten Scheible

Michael Klier

Jürgen Schorr

Yüriy Bogachik

Bernd Windisch

Matthias Wolf

In a method for controlling an internal combustion engine, in particular a diesel internal combustion engine, at least one variable is formed on a cylinder-specific basis, which variable characterizes a respective profile of a combustion in an associated combustion chamber, and the control of cylinder-specific fuel injection parameters is influenced as a function of said at least one variable which characterizes the combustion profile.

Method of controlling an internal combustion engine, in particular a diesel engine

The invention is based on an electromagnetic actuator for activating a gas exchange valve. The latter has both an opening magnet and a closing magnet, between which an armature which is connected to a valve stem is arranged in a coaxially displaceable fashion. The armature is held in a position of equilibrium between the magnets by means of an upper and a lower prestressed valve spring when the magnets are in a currentless state. In order to be able to control the actuator better, a plunger coil is connected to a valve stem of the gas exchange valve and is arranged coaxially with respect to said valve stem. Said plunger coil dips into a radially magnetized air gap of an annular, axially magnetized permanent magnet.

Electromagnetic actuator for actuating a gas-exchanging valve

Method for controlling the supply of electrical energy to an electromagnetic device and use of a sliding mode controller. Control devices are known in which, in order to obtain a desired movement of an electromagnetically activated gas exchange valve, the supply of electrical energy is controlled as a function of a measured position of the gas exchange valve. The novel method is intended to optimize the control with respect to the movement forms to be obtained, the formation of noise and/or the required use of electrical energy. In a control device according to the invention, a differential signal is generated using the movement signal or a signal generated from the movement signal, and using a desired signal. The supply of electrical energy to the activating device of the gas exchange valve is controlled by means of a sliding mode controller using the differential signal.

Method for controlling the supply of electrical energy to an electromagnetic device and use of a sliding mode controller

In the case of known electromagnetic actuators each with at least one electromagnet acting on an armature, operational fluctuations of system parameters can lead to incorrect functioning, in particular to increased wear of the actuator, undesired noise generation, and excessive power consumption. In the new method, which is preferably used for operating gas change valves in internal combustion engines, the impact velocity of the armature on the electromagnet is automatically adjusted to a preset value. For this purpose, a controlled variable that depends on a change of inductance of the electromagnet is created as a measure of the impact velocity of the armature on The electromagnet and the controlled variable is adjusted by controlling the energy supply To the electromagnet to provide a setpoint value that the controlled variable adopts at a preset value of the impact velocity of the armature on the electromagnet. This permits reliable continuous duty with the new method.

Method for driving an electromagnetic actuator for operating a gas change valve

In a method and apparatus for controlling a valve with an electromagnetically operable valve element, when an assigned solenoid is energized by means of a capturing current pulse, the valve element is moved against an elastic restoring force into a stop-defined end position, and reaches the end position at an impact velocity which is controlled by variable adjustment of the capturing current pulse. The impact velocity is controlled by means of a minimal-value control, in which, as the switch-on point in time of the capturing current pulse for a next valve operation, that of a preceding operation plus a control increment is selected, which is defined as a minimum target function of the gradient of the impact velocity determined from preceding operating cycles, as a function of the switch-on point in time.

Method and arrangement for the electromagnetic control of a valve

An electromagnetic actuator for the operation of a gas change valve has two electromagnets placed opposite to one another and an armature acting on the gas change valve that can be moved against the force of at least one valve spring. In an actuator of this kind, fluctuations of operational system parameters can lead to incorrect functioning and to increased wear of the actuator. With a new method for driving an actuator, the acceleration curve of the gas change valve is measured with an acceleration sensor and the energy supplied to the electromagnet capturing the armature is controlled according to the acceleration curve of the gas change valve. In this way, kinetic energy losses due to disturbances can be compensated so that the armature impacts the capturing electromagnet with a predetermined velocity.

Method for driving an electromagnetic actuator for operating a gas

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Stuttgart, Germany

Frank Kirschbaum