OPERATING POINT CONTROLLER

Abstract

A system for controlling an operating point of a power source for a propulsive e-machine in a hybrid electric vehicle, including: a power train including a power source and at least one propulsive e-machine, wherein the power source includes an integrated starter generator and an internal combustion engine; at least one desired operating point for the power source including at least one characteristic parameter; an operating point component configured to query the at least one desired operating point and to selectively distribute the control of the at least one desired operating point to a control of the internal combustion engine or to a control of the integrated starter generator control.

Claims

1. A system for controlling an operating point of a power source for a propulsive e-machine in a hybrid electric vehicle, comprising: a power train comprising a power source and at least one propulsive e-machine, wherein the power source comprising an integrated starter generator and an internal combustion engine, wherein at least one desired operating point for the power source comprising at least one characteristic parameter; and an operating point component configured to query the at least one desired operating point and to distribute the control of the at least one desired operating point to a control of the internal combustion engine or to a control of the integrated starter generator control; wherein: in case the at least one characteristic parameter of the at least one desired operating point being in a predetermined limit, the operating point component distributes the control of the at least one desired operating point to the control of the internal combustion engine; and in case the at least one characteristic parameter of the at least one desired operating point being beyond the predetermined limit, the operating point component distributes the control of the at least one desired operating point to the control of the integrated starter generator.

2. The system according to claim 1, wherein the desired operating point is determined by using a desired power of the propulsive e-machine and feedback information of the power train and/or an electrical system power drain of the hybrid electric vehicle and/or a charge state of a battery of the hybrid electric vehicle.

3. The system according to claim 1, wherein the control, which has not been distributed the control over the desired operating point, keeps its control parameters constant; and the control, which has been distributed the control over the desired operating point, readjusts its control parameters in order to approximate the desired operating point.

4. The system according to claim 1, wherein the desired operating point comprises a rotational speed and/or a torque of the power source.

5. The system according to claim 1, wherein a requested charge power of the power source is determined by using the desired power of the propulsive e-machine and feedback information of the power train.

6. The system according to claim 5, wherein an information of the requested charge power is transmitted to the control of the internal combustion engine and to the control of the integrated starter generator.

7. The system according to claim 1, wherein the at least one characteristic parameter comprises an operating state of the power source, wherein the operating state is either stationary or dynamic.

8. The system according to claim 7, wherein the operating state is determined by comparing the desired operating point with a current operating point.

9. The system according to claim 1, further comprising a plurality of desired operating points.

10. The system according to claim 1, wherein the operating point component queries the at least one desired operating point and distributes the control of the at least one desired operating point to the control of the internal combustion engine or to the control of the integrated starter generator continuously.

11. A control device for controlling an operating point of a power source for a propulsive e-machine in a hybrid electric vehicle, comprising: an internal combustion engine control configured to control a supply of a mechanical power of an internal combustion engine in dependency of at least one desired operating point; an integrated starter generator control configured to control a supply of an electric power of an integrated starter generator in dependency of the at least one desired operating point; and an operating point component configured to query the at least one desired operating point and to distribute a control of the at least one desired operating point to the internal combustion control or to a control of the integrated starter generator control.

12. The control device according to claim 11, further comprising: an energy management component configured to determine a desired electric power for a propulsive e-machine; a charge power component configured to determine a requested charge power for a power source comprising an integrated starter generator and an internal combustion engine; an operating point component configured to determine the desired operating point; and a feedback component configured to provide feedback information to the energy management component and/or charge power component and/or operating point component and/or the operating point component.

13. The control device according to claim 12, wherein: the operating point component provides the information of the desired operating point to the operating point component; and the energy management component provides the information of the desired electric power to the charge power component.

14. The control device according to claim 11, wherein the feedback information comprises current rotational speed and/or torque of the electric engine.

15. The control device according to claim 11, wherein the control device is utilized in a hybrid electric vehicle.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In the following, the disclosure is described exemplarily with reference to the enclosed FIGURE, in which:

[0023] FIG. 1 is a schematic view of the control device according to a further embodiment of the present disclosure.

[0024] Notably, the figures are merely schematic representations and serve only to illustrate an embodiment of the present disclosure. Identical or equivalent elements are in principle provided with the same reference signs.

DETAILED DESCRIPTION

[0025] FIG. 1 shows a schematic view of a control device 100 according to an embodiment of the present disclosure. The control device 100 includes a feedback component 101, which provides current system information (e.g. current rotational speed and torque of the internal combustion engine and desired rotational speed of propulsive e-machine). The control device 100 further includes an energy management component 102, which determines based on system feedback from the feedback component 101 a desired electrical power. The information over the desired electrical power and system feedback is transferred to a charge power component 103, which determines a requested charge power for the power source including an integrated starter engine and internal combustion engine. The control device 100 further includes an operating point component 104, which determines based on system feedback and the desired electrical power a desired operating point for the internal combustion engine. The information of the desired operating point and system feedback is transferred to the operating point control 105, which compares the desired operating point with the current operating point and distributes the control of the operating point in dependency of the comparison result either to the control of the internal combustion engine 106 or the control of the integrated starter generator 107. Furthermore, the information over the requested charge power is transferred from the charge power component 103 to the control of the internal combustion engine 106 and the control of the integrated starter generator 107.

[0026] In the following, an example of operating the control device shown in FIG. 1 is explained. In a first step, a desired electrical power is determined, wherein the determining considers the power demand of the propulsive e-machine and the power demand of the remaining electrical system (e.g. air condition, state of charge of the battery). In a second step, a requested charge power of a power source including an internal combustion engine and an integrated starter generator is determined. The determining of the requested charge power considers the desired electrical power. The requested charge power serves as input for the control of the internal combustion engine and the control of the integrated starter generator, wherein the input is transferred into control commands (i.e. throttle position of internal combustion engine, change of anchor voltage of the integrated starter generator or change of current in the stator of the integrated starter generator). In a third step, a desired operating point for an internal combustion engine is determined, wherein the determining considers the desired electrical power. Based on the desired electrical power a mechanical input power for an integrated starter generator is derived. Based on the necessary mechanical input power the desired operating point of the internal combustion engine is determined, wherein the operating point includes the torque and the rotational speed of the internal combustion engine. In a fourth step, a control of the desired operating point is distributed to either a control of the internal combustion engine or a control of the integrated starter generator, wherein the distributing considers the desired operating point and a current operating point. By comparing the current operating point and the desired operating point, the change of the torque and rotational speed are calculated. The change of the torque and the rotational speed serve as characteristic values. These characteristic values are compared with predetermined limits for the changes of the torque and rotational speed. In case the characteristic values are below the predetermined limits, which means that the changes of torque and/or rotational speed are small, the control of the desired operating point is distributed to the control of the integrated starter generator otherwise to the control of the internal combustion engine. The respectively other control (i.e. either the control of the internal combustion engine or the control of the integrated starter generator) keeps its control parameters constant.

[0027] Other variations to the disclosed embodiment can be understood and effected by those skilled in the art in practicing the claimed subject matter, from the study of the drawings, the disclosure, and the appended claims. In particular, respective parts/functions of the respective embodiments described above may also be combined with each other. In the claims, the word “comprising” does not exclude other elements or steps and the indefinite article “a” or “an” does not exclude a plurality. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage. Any reference signs in the claims should not be construed as limiting the scope of the claims.