Closed-loop control device for closed-loop control of a power assembly including an internal combustion engine and a generator having an operative drive connection to the internal combustion engine, closed-loop control arrangement having such a closed-loop control device, power assembly and method for closed-loop control of a power assembly

1 . A closed-loop control device for closed-loop control of a power assembly including an internal combustion engine and a generator having an operative drive connection to the internal combustion engine, the closed-loop control device comprising:

a power controller which is configured for:

detecting a generator power (P G ) of the generator as a controlled variable;

determining a power control deviation (e P ) as a difference between the generator power (P G ) which is detected and a target generator power (P soll ); and

determining a first preset variable as a manipulated variable for controlling the internal combustion engine as a function of the power control deviation (e P );

a frequency controller which is configured for:

detecting a generator frequency (f G ) of the generator as a controlled variable;

determining a frequency control deviation (e f ) as a difference between the generator frequency (f G ) which is detected and a target generator frequency (f soll );

determining a second preset variable as a manipulated variable for controlling the internal combustion engine as a function of the frequency control deviation (e f ); and

a switchover module which is configured for:

using, in a first functional state of the switchover module, the first preset variable as a control preset variable for controlling the internal combustion engine;

using, in a second functional state of the switchover module, the second preset variable as a control preset variable for controlling the internal combustion engine;

wherein the power controller and the frequency controller are configured for calculating at least one controller component for a respectively assigned preset variable during operation of the closed-loop control device, independently of a current functional state of the switchover module.

2 . The closed-loop control device according to claim 1 , wherein the at least one controller component is selected from a group consisting of a proportional component and a differential component.

3 . The closed-loop control device according to claim 1 , wherein the closed-loop control device is configured for transferring the respectively assigned preset variable determined by a controlling controller—selected from the power controller and the frequency controller—to a non-controlling controller—selected from the power controller and the frequency controller—for an initialization before the switchover module switches over.

4 . The closed-loop control device according to claim 3 , wherein the closed-loop control device is configured for calculating an initialization variable for the initialization of the non-controlling controller from the respectively assigned preset variable—which is transferred—based on the at least one controller component calculated by the non-controlling controller.

5 . The closed-loop control device according to claim 4 , wherein the closed-loop control device is configured for initializing an integral component of the non-controlling controller with the initialization variable.

6 . The closed-loop control device according to claim 1 , wherein the closed-loop control device is configured for determining, as the first preset variable and as the second preset variable respectively, a target torque (M soll ) or a target speed (n soll ).

7 . The closed-loop control device according to claim 1 , wherein the closed-loop control device is formed as:

(a) an open-loop control device for directly controlling the internal combustion engine; or

(b) a generator controller.

8 . The closed-loop control device according to claim 7 , wherein the closed-loop control device is formed as the generator controller with an interface to an open-loop control device of the internal combustion engine.

9 . The closed-loop control device according to claim 1 , wherein the switchover module is configured for switching between the first functional state and the second functional state parameter-dependently, alternately, or according to a predetermined sequence.

10 . The closed-loop control device according to claim 9 , wherein the switchover module is configured for switching between the first functional state and the second functional state alternately and thereby cyclically.

11 . The closed-loop control device according to claim 1 , wherein the closed-loop control device is configured for:

calculating a preset variable additional term from the target generator power (P soll ) by way of a calculation element having a differential transfer behavior; and

offsetting the preset variable additional term against a precursor preset variable calculated by the power controller in order to obtain the first preset variable.

12 . The closed-loop control device according to claim 11 , wherein the closed-loop control device is configured for:

calculating a preset variable additional term from the target generator power (P soll ) by way of a calculation element having a differential transfer behavior; and

offsetting the preset variable additional term against a precursor preset variable calculated by the power controller—in order to add the preset variable additional term to the precursor preset variable—in order to obtain the first preset variable.

13 . A closed-loop control arrangement for closed-loop control of a power assembly including an internal combustion engine and a generator having an operative drive connection to the internal combustion engine, the closed-loop control arrangement comprising:

a closed-loop control device which is formed as a general controller, is for closed-loop control of the power assembly, and includes:

a power controller which is configured for:

detecting a generator power (P G ) of the generator as a controlled variable;

determining a power control deviation (e P ) as a difference between the generator power (P G ) which is detected and a target generator power (P soll ); and

determining a first preset variable as a manipulated variable for controlling the internal combustion engine as a function of the power control deviation (e P );

a frequency controller which is configured for:

detecting a generator frequency (f G ) of the generator as a controlled variable;

determining a frequency control deviation (e f ) as a difference between the generator frequency (f G ) which is detected and a target generator frequency (f soll );

determining a second preset variable as a manipulated variable for controlling the internal combustion engine as a function of the frequency control deviation (e f ); and

a switchover module which is configured for:

using, in a first functional state of the switchover module, the first preset variable as a control preset variable for controlling the internal combustion engine;

using, in a second functional state of the switchover module, the second preset variable as the control preset variable for controlling the internal combustion engine;

wherein the power controller and the frequency controller are configured for calculating at least one controller component for a respectively assigned preset variable during operation of the closed-loop control device, independently of a current functional state of the switchover module; and

an open-loop control device operatively connected to the closed-loop control device for direct control of the internal combustion engine, the closed-loop control device being configured for transmitting the control preset variable to the open-loop control device.

14 . A power assembly, comprising:

an internal combustion engine;

a generator including an operative drive connection to the internal combustion engine; and

one of:

(a) a closed-loop control device for closed-loop control of the power assembly, the closed-loop control device including:

a power controller which is configured for:

detecting a generator power (P G ) of the generator as a controlled variable;

determining a power control deviation (e P ) as a difference between the generator power (P G ) which is detected and a target generator power (P soll ); and

determining a first preset variable as a manipulated variable for controlling the internal combustion engine as a function of the power control deviation (e P );

a frequency controller which is configured for:

detecting a generator frequency (f G ) of the generator as a controlled variable;

determining a frequency control deviation (e f ) as a difference between the generator frequency (f G ) which is detected and a target generator frequency (f soll );

determining a second preset variable as a manipulated variable for controlling the internal combustion engine as a function of the frequency control deviation (e f ); and

a switchover module which is configured for:

using, in a first functional state of the switchover module, the first preset variable ( 16 ) as a control preset variable for controlling the internal combustion engine;

using, in a second functional state of the switchover module, the second preset variable as the control preset variable for controlling the internal combustion engine;

wherein the power controller and the frequency controller are configured for calculating at least one controller component for a respectively assigned preset variable during operation of the closed-loop control device, independently of a current functional state of the switchover module; and

(b) a closed-loop control arrangement for closed-loop control of the power assembly, the closed-loop control arrangement including:

a closed-loop control device which is formed as a general controller, is for closed-loop control of the power assembly, and includes:

a power controller which is configured for:

 detecting a generator power (P G ) of the generator as a controlled variable;

 determining a power control deviation (e P ) as a difference between the generator power (P G ) which is detected and a target generator power (P soll ); and

 determining a first preset variable as a manipulated variable for controlling the internal combustion engine as a function of the power control deviation (e P );

a frequency controller which is configured for:

 detecting a generator frequency (f G ) of the generator as a controlled variable;

 determining a frequency control deviation (e f ) as a difference between the generator frequency (f G ) which is detected and a target generator frequency (f soll );

 determining a second preset variable as a manipulated variable for controlling the internal combustion engine as a function of the frequency control deviation (e f );

a switchover module which is configured for:

 using, in a first functional state of the switchover module, the first preset variable as a control preset variable for controlling the internal combustion engine;

 using, in a second functional state of the switchover module, the second preset variable as the control preset variable for controlling the internal combustion engine;

wherein the power controller and the frequency controller are configured for calculating at least one controller component for a respectively assigned preset variable during operation of the closed-loop control device, independently of a current functional state of the switchover module; and

an open-loop control device operatively connected to the closed-loop control device for direct control of the internal combustion engine, the closed-loop control device being configured for transmitting the control preset variable to the open-loop control device;

wherein the closed-loop control device or the closed-loop control arrangement is operatively connected to the internal combustion engine and the generator of the power assembly.

15 . A method for closed-loop control of a power assembly including an internal combustion engine and a generator having an operative drive connection to the internal combustion engine, the method comprising the steps of:

detecting a generator power (P G ) of the generator as a controlled variable;

determining a power control deviation (e P ) as a difference between the generator power (P G ) which is detected and a target generator power (P soll );

determining a first preset variable as a manipulated variable for controlling the internal combustion engine as a function of the power control deviation (e P );

detecting a generator frequency (f G ) of the generator as a controlled variable;

determining a frequency control deviation (e f ) as a difference between the generator frequency (f G ) which is detected and a target generator frequency (f soll );

determining a second preset variable as a manipulated variable for controlling the internal combustion engine as a function of the frequency control deviation (e f );

using, in a first functional state, the first preset variable as a control preset variable for controlling the internal combustion engine;

using, in a second functional state, the second preset variable as a control preset variable for controlling the internal combustion engine;

calculating at least one controller component for the first preset variable and for the second preset variable, independently of the current functional state.