Operating Strategy for Hybrid Vehicles

Abstract

A method for implementing an operating strategy for (plug-in) hybrid vehicles. According to the method, it is possible to cause in a particularly advantageous manner an alleviation of the load of a starting device and thereby achieve emission advantages. A correspondingly configured system arrangement is provided for implementing the method. A non-transitory computer-readable medium programmed to execute the method is also provided, in which control commands implement the method and/or operate the proposed system arrangement.

Claims

1.-10. (canceled)

11. A method for implementing an efficient operating strategy for a hybrid motor vehicle, wherein a clutch for connecting an internal combustion engine to a drive is arranged between the internal combustion engine and an electric motor, comprising: iteratively determining a state of charge of a traction battery of the motor vehicle; and in a case in which the state of charge is below a threshold value, coupling the internal combustion engine until the state of charge exceeds the threshold value.

12. The method according to claim 11, wherein the threshold value is read out of an operating mode and/or out of a data memory.

13. The method according to claim 11, wherein the threshold value represents a low state of charge.

14. The method according to claim 11, wherein the threshold value corresponds to a charge sustaining operating mode.

15. The method according to claim 11, wherein in order to couple the internal combustion engine the clutch is closed.

16. The method according to claim 11, wherein the internal combustion engine is entrained by the electric motor.

17. The method according to claim 11, wherein a reduction in drag torque is carried out with respect to the internal combustion engine.

18. The method according to claim 11, wherein the hybrid motor vehicle is a plug-in hybrid motor vehicle.

19. A system arrangement for implementing an efficient operating strategy for a hybrid motor vehicle, wherein a clutch for connecting an internal combustion engine to a drive is arranged between the internal combustion engine and an electric motor, comprising: a sensor system that iteratively determines a state of charge of the motor vehicle; wherein, in a case in which the state of charge is below a threshold value, the internal combustion engine is coupled until the state of charge exceeds the threshold value.

20. A non-transitory computer-readable medium programmed to execute on a computer a method for implementing an efficient operating strategy for a hybrid motor vehicle, wherein a clutch for connecting an internal combustion engine to a drive is arranged between the internal combustion engine and an electric motor, the method comprising: iteratively determining a state of charge of a traction battery of the motor vehicle; and in a case in which the state of charge is below a threshold value, coupling the internal combustion engine until the state of charge exceeds the threshold value.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0037] FIG. 1 shows a schematic block diagram of a P2 hybrid topology such as is used according to the invention; and

[0038] FIG. 2 shows a schematic flow diagram of a method for implementing an efficient operating strategy according to an aspect of the present invention.

DETAILED DESCRIPTION OF THE DRAWINGS

[0039] FIG. 1 shows a schematic block diagram of a P2 hybrid topology, wherein the internal combustion engine is on the left and the drive shaft on the right. The electric motor which is coupled to the internal combustion engine by means of a clutch KO is shown in the center. The wheels are shown at the top and at the bottom. The internal combustion engine and the electric motor together drive the input shaft of the transmission, and the torques of the internal combustion engine and electric motor add together to form a transmission input torque.

[0040] FIG. 2 shows a schematic flow diagram of a method for implementing an efficient operating strategy for hybrid motor vehicles, wherein a clutch for connecting the internal combustion engine to the drive is arranged between an internal combustion engine and an electric motor, having iterative determination 100 of a state of charge of the motor vehicle, wherein when a state of charge below a provided 101 threshold value is determined 100, the internal combustion engine is coupled 102 until the determined 100 state of charge exceeds the provided 101 threshold value again.

[0041] A person skilled in the art recognizes here that the steps can have further sub steps and, in particular, that the method steps can each be executed iteratively and/or then in a different sequence.

[0042] A data memory or a computer-readable medium with a computer program product having control instructions which implement the proposed method and/or operate the proposed system arrangement when they are executed on a computer is not shown here.