Operating an internal combustion engine coupled to a generator
The embodiments relate to a method and to a device for operating a system including a generator and an internal combustion engine driving the generator, wherein a rotational speed of the generator is controlled by a rotational speed controller. In the method, the rotational speed controller outputs a target torque as manipulated variable, and an additional torque is imposed on the target torque, wherein the additional torque is calculated or is determined based on a measured value picked up from the system.
1. A method for operating a system comprising a generator and an internal combustion engine that drives the generator, the method comprising:
controlling a rotational speed of the generator by a rotational speed controller;
outputting, by the rotational speed controller, a target torque as a manipulated variable; and
imposing an additional torque on the target torque,
wherein the additional torque is a torque that the generator applies counter to a pressure prevailing in a combustion chamber of the internal combustion engine,
wherein the pressure prevailing in the combustion chamber of the internal combustion engine is estimated by a thermodynamic model, and
wherein the additional torque is calculated based on the estimated pressure.
2. The method of claim 1 , wherein the additional torque is also a torque to accelerate the rotor and the piston,
wherein the additional torque is calculated by a pilot control block, such that a pilot control torque is calculated and is imposed as the additional torque on the target torque output by the rotational speed controller.
3. The method of claim 2 ,
wherein the additional torque determined on the basis of the estimated pressure is also imposed on the target torque output by the rotational speed controller.
4. An open-loop and closed-loop control apparatus comprising:
at least one control unit; and
a rotational speed controller,
wherein the apparatus is configured to control a rotational speed of a generator of a system,
wherein a target torque is configured to be output as a manipulated variable by the rotational speed controller,
wherein the apparatus is configured to impose an additional torque on the target torque to counter a pressure prevailing in a combustion chamber of the internal combustion engine,
wherein an estimated value of the pressure prevailing in the combustion chamber of the internal combustion engine is configured to be calculated by a thermodynamic model, and
wherein the additional torque is configured to be calculated based on the estimated value and data output by the control unit.
5. The open-loop and closed-loop control apparatus of claim 4 , wherein a pilot control torque is configured to be determined by a pilot control block included in the open-loop and closed-loop control apparatus, and
wherein the pilot control torque is configured to be imposed as the additional torque on the target torque.
6. A system comprising:
a generator;
an internal combustion engine; and
an open-loop and closed-loop control apparatus having:
at least one control unit; and
a rotational speed controller,
wherein the open-loop and closed-loop control apparatus is configured to control a rotational speed of the generator of the system,
wherein a target torque is configured to be output as a manipulated variable by the rotational speed controller, and
wherein the open-loop and closed-loop control apparatus is configured to impose an additional torque on the target torque to counter a pressure prevailing in a combustion chamber of the internal combustion engine,
wherein the pressure prevailing in the combustion chamber of the internal combustion engine is configured to be estimated by a thermodynamic model,
wherein the additional torque is configured to be calculated based on the estimated pressure.
7. The open-loop and closed-loop control apparatus of claim 4 , wherein the data output by the control unit comprises at least one geometric value, a target position, and kinematic data.