OPERATING AN INTERNAL COMBUSTION ENGINE COUPLED TO A GENERATOR

• US 20170254275A1
• Filed: 01/21/2015
• Published: 09/07/2017
• Est. Priority Date: 02/27/2014
• Status: Active Grant

• Current Assignee: Rolls-Royce Deutschland Limited & Company KG (Rolls-Royce Holdings Plc)
• Original Assignee: Siemens AG
• Inventors: Klotzek, Andreas
• Granted Patent: US 10,030,591 B2
• Time in Patent Office: Days
• CPC Class Codes: F02B 63/042 Rotating electric generators
• CPC Class Codes: F02D 2041/141 using a feed-forward control element
• CPC Class Codes: F02D 29/06 peculiar to engines driving electric generators
• CPC Class Codes: F02D 35/02 on interior conditions
• CPC Class Codes: F02D 35/024 using an estimation
• CPC Class Codes: F02D 41/021 Introducing corrections for particular conditions exterior to the engine conjoint control of vehicle sub-units for propelling the vehicle B60W30/18
• CPC Class Codes: F02D 41/083 taking into account engine load variation, e.g. air-conditionning
• CPC Class Codes: F02D 41/14 Introducing closed-loop corrections
• CPC Class Codes: F02D 41/1497 With detection of the mechanical response of the engine

Abstract

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.

Claims

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 or a torque to accelerate a rotor of the generator and a piston of the internal combustion engine,

wherein the additional torque is calculated or determined based on a measured value picked up from the system.

2. The method of claim 1, wherein, the additional torque is the torque that the generator applies counter to the pressure prevailing in the combustion chamber of the internal combustion engine, and

wherein a measured pressure value is recorded and the additional torque is calculated by the measured pressure value.

3. The method of claim 1, wherein, the additional torque is the torque that the generator applies counter to the pressure prevailing in the combustion chamber of the internal combustion engine,

wherein the pressure prevailing in a combustion chamber of the internal combustion engine is estimated and the additional torque is calculated based on the estimated pressure by a thermodynamic model.

4. The method of claim 1, wherein, the additional torque is the 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.

5. The method of claim 4, wherein the additional torque is also the torque that the generator applies counter to the pressure prevailing in the combustion chamber of the internal combustion engine, wherein the pressure prevailing in a combustion chamber of the internal combustion engine is estimated and the additional torque is calculated based on the estimated pressure by a thermodynamic model, and

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.

11. The method of claim 1, wherein the measured value is picked up from the system at the internal combustion engine.

12. The method of claim 4, wherein the additional torque is also the torque that the generator applies counter to the pressure prevailing in the combustion chamber of the internal combustion engine, and wherein a measured pressure value is recorded and the additional torque is calculated by the measured pressure value, and

wherein the additional torque determined on the basis of the measured pressure value is also imposed on the target torque output by the rotational speed controller.

6. 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, and

wherein the apparatus is configured to impose an additional torque on the target torque, wherein the additional torque is calculated or determined based on a measured value picked up from the system.

7. The open-loop and closed-loop control apparatus of claim 6, wherein a measured pressure value recorded in the system is processed by the open-loop and closed-loop control apparatus,

wherein the additional torque is configured to be determined using the measured pressure value and using data output by the control unit, and

wherein the additional torque is configured to be imposed on the target torque.

8. The open-loop and closed-loop control apparatus of claim 6, wherein an estimated value of the pressure prevailing in the combustion chamber of the internal combustion engine is configured to be determined by a thermodynamic model included in the open-loop and closed-loop control apparatus,

wherein the additional torque is configured to be determined using the estimated value and data output by the control unit, and

wherein the additional torque is configured to be imposed on the target torque.

9. The open-loop and closed-loop control apparatus of claim 6, 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.

13. The open-loop and closed-loop control apparatus of claim 7, wherein the measured pressure value is recorded at the internal combustion engine.

14. The open-loop and closed-loop control apparatus of claim 13, wherein the data output by the control unit comprises at least one geometric value, a target position, and kinematic data.

15. The open-loop and closed-loop control apparatus of claim 7, wherein the data output by the control unit comprises at least one geometric value, a target position, and kinematic data.

16. The open-loop and closed-loop control apparatus of claim 8, wherein the data output by the control unit comprises at least one geometric value, a target position, and kinematic data.

10. 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, wherein the additional torque is calculated or determined based on a measured value picked up from the system.