Siemens Aktiengesellschaft

Daimler Chrysler Ag

Mannesmann Aktiengesellschaft

Sartorius Ag

Madhukar Pandit

Bernd-Markus Pfeiffer

Kurt Maute

Michael Virnich

Paul Walter Baier

Klaus Dostert

Frank Kirschbaum

Paul Von Der Haar

Reinhard Simons

Hermann Merz

Karl-Heinz Buchheit

Stefan Bergold

For controlling multivariable systems, a control unit for controlling a system with several coupled control variables. The control unit includes controllers ( ) having associated control variables (x , x ) as well as a decoupling network. The decoupling network is connected upstream from the system and includes at least one first decoupling member ( ). A first output variable (y ) of a first one of the controllers ( ) is routed to the first decoupling member ( ). The first decoupling member generates a first correcting quantity ( ) for a second output variable (y ) of a second one of the controllers ( ). The second controller ( ) has a PI- or PID-controller core ( ) and is configured such that integrator windup is eliminated when the second output variable (y ) corrected with the first correcting quantity ( ) reaches a manipulated variable limit. Bumpless manual/automatic changeover of the controller is also made possible.

Control unit for controlling a system with several coupled variables

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

A process for the cyclic control of extruders which facilitates the precise control of an extruder to achieve maximum output and at the same time optimal quality of the extruded profiles. Accordingly therefore the extrusion velocity is controlled in such a way that the profile exit temperature is constant and equal to a prescribed temperature trajectory. Thereby the extrusion velocity and the profile exit temperature are measured over the complete cycle interval for each and every cycle k, and with the knowledge of the relationship between these quantities and the trajectory of the extrusion velocity of the cycle k, the trajectory of the extrusion velocity for the (k+1)th cycle is determined, such that the control error and the control effort are as low as possible and after completion of the (k+1)th extrusion cycle the whole process is repeated for every subsequent cycle therefore until the whole extrusion program is completed. The process is especially suited for the manufacture of extruded profiles of metals with low and/or wavelength dependent emmissivity and/or variable surface characteristics, in particular for the manufacture of extruded aluminium and aluminium alloy profiles.

Temperature control in extruders

The gravimetric control of a mass flow from or into a container located on a balance using a pulsating dosing pump, the output signal of the balance is digitally filtered in such a manner that the course in time of the mass flow is cyclically estimated from the filtered wighing signal. This estimated value of the course in time of the mass flow is used to calculate the course in time of an auxiliary mass flow which compensates the pulsation of the mass flow of the pulsating dosing pump and a speed course is calculated from the course in time of the auxiliary mass flow for driving an auxiliary dosing pump.

Method and device for a pulsation-free, continuous and gravimetric dosing

A receiving circuit for an interference-suppressing communications system having a narrow-band conventional message modulation and additional pseudo-noise phase shift keying (PN-PSK), has a pseudo-random generator whose pseudo-random sequence is identical to the pseudo-random sequence provided by the system transmitter. The pseudo-random generator actuates a phase-shift keying element to cancel the phase shift modulation produced at the transmitter. A matched filter or correlation network for correlation of the pseudo-random sequence at the receiver with the pseudo-random sequence contained in the received signal is provided. The message modulation impairs the function of the matched filter or the correlation network. The degrading influence of message modulation is to be eliminated, at least, reduced. To this end, a demodulation circuit is provided which receives the entire received signal and the signal present after removal of the phase-shift keying to provide an input for the matched filter or correlation network. This signal only exhibits the pseudo-noise phase-shift keying contained in the received signal, but no longer has the message modulation.

Receiving circuit in an interference-suppressing communications system

Growing community of inventors

Kaiserslautern, Germany

Madhukar Pandit