Method for Controlling an Electric Motor of a Battery-Operated Electric Vehicle, Battery-Operated Electric Vehicle and a Control Device for a Battery-Operated Electric Vehicle

Abstract

Please substitute the new Abstract submitted herewith for the original Abstract: A method for controlling an electric motor of a battery-operated electric vehicle (BEV) includes receiving a signal for activating a drive slip control function for a braked start at full load of the BEV, supplying the electric motor with a predefined basic application of current while the BEV is in a braked state, and releasing a vibration mode by exciting the electric motor corresponding to a predetermined excitation scheme in addition to the predefined basic application of current. A battery-operated electric vehicle and a control device for a battery-operated electric vehicle are also disclosed.

Claims

1-9. (canceled)

10. A method for controlling an electric motor of a battery-operated electric vehicle (BEV), the method comprising: receiving a signal for activating a drive slip control function for a braked start at full load of the BEV; supplying the electric motor with a predefined basic application of current while the BEV is in a braked state; and triggering a vibration mode by excitation of the electric motor in accordance with a predefined excitation scheme in addition to the predefined basic application of current.

11. The method according to claim 10, wherein the predefined excitation scheme comprises an oscillating electric driving torque, an effective value of which does not make contribution to propelling the BEV.

12. The method according to claim 11, wherein the effective value of the oscillating electric excitation torque lies above a predetermined threshold value, which is above a motor torque of 50 Nm.

13. The method according to claim 11, wherein the oscillating electric driving torque lies in a frequency range of 10 Hz to 300 Hz.

14. The method according to claim 10, wherein the predefined basic application of current lies in a range of 40 A to 140 A.

15. The method according to claim 10, wherein the predefined excitation scheme comprises pulsating excitation with a change between high and low currents, wherein an amplitude lies in a range of 20 Nm to 200 Nm.

16. The method according to claim 10, comprising: deactivating the vibration mode.

17. A battery-operated electric vehicle (BEV) comprising: a controller configured to: receive a signal for activating a drive slip control function for a braked start at full load of the BEV; supply an electric motor of the BEV with a predefined basic application of current while the BEV is in a braked state; and trigger a vibration mode by excitation of the electric motor in accordance with a predefined excitation scheme in addition to the predefined basic application of current.

18. The BEV according to claim 17, wherein the predefined excitation scheme comprises an oscillating electric driving torque, an effective value of which does not make contribution to propelling the BEV.

19. The BEV according to claim 18, wherein the effective value of the oscillating electric excitation torque lies above a predetermined threshold value, which is above a motor torque of 50 Nm.

20. The BEV according to claim 18, wherein the oscillating electric driving torque lies in a frequency range of 10 Hz to 300 Hz.

21. The BEV according to claim 17, wherein the predefined basic application of current lies in a range of 40 A to 140 A.

22. The BEV according to claim 17, wherein the controller is configured to: trigger the vibration mode by excitation of the electric motor in accordance with the predefined excitation scheme by triggering a pulsating excitation with a change between high and low currents, wherein an amplitude lies in a range of 20 Nm to 200 Nm.

23. The BEV according to claim 17, wherein the controller is configured to: deactivate the vibration mode.

24. A controller for a battery-operated electric vehicle (BEV), wherein the controller is configured to: receive a signal for activating a drive slip control function for a braked start at full load of the BEV; supply an electric motor of the BEV with a predefined basic application of current while the BEV is in a braked state; and trigger a vibration mode by excitation of the electric motor in accordance with a predefined excitation scheme in addition to the predefined basic application of current.

25. The controller according to claim 24, wherein the predefined excitation scheme comprises an oscillating electric driving torque, an effective value of which does not make contribution to propelling the BEV.

26. The controller according to claim 25, wherein the effective value of the oscillating electric excitation torque lies above a predetermined threshold value, which is above a motor torque of 50 Nm.

27. The controller according to claim 25, wherein the oscillating electric driving torque lies in a frequency range of 10 Hz to 300 Hz.

28. The controller according to claim 24, wherein the predefined basic application of current lies in a range of 40 A to 140 A.

29. The controller according to claim 24, configured to: trigger the vibration mode by excitation of the electric motor in accordance with the predefined excitation scheme by triggering a pulsating excitation with a change between high and low currents, wherein an amplitude lies in a range of 20 Nm to 200 Nm.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0029] FIG. 1 shows an excitation scheme for staging a racing start according to an embodiment of the present disclosure; and

[0030] FIG. 2 shows a flow diagram with the method steps for controlling an electric motor for a racing start according to an embodiment of the present disclosure.

DETAILED DESCRIPTION OF THE DRAWINGS

[0031] FIG. 1 shows an excitation scheme for staging a racing start according to an embodiment of the present disclosure. In this situation, the launch control of the BEV which in this case has both a brake pedal and a gas pedal, but not a clutch, is triggered by simultaneous actuation of the brake and the gas pedal. The electric motor here of the BEV is supplied with a predefined basic application of current, for example with approx. 80 A, such that the vehicle body is lowered during simultaneous braking.

[0032] At the same time, the vibration mode, in which the electric motor or the electric motors, in the case in which the BEV has two electric motors, is/are excited in accordance with a predefined excitation scheme, is also triggered here.

[0033] The diagram of FIG. 1 shows the torque of an electric motor of a BEV for the above-described racing start situation, wherein the torque has been plotted in Nm on the Y axis and the time in s on the X axis. The illustration is purely schematic since the plotted values, as already explained above, depend on the electric motor itself.

[0034] As can be seen in the figure, the excitation scheme comprises the provision of an oscillating electric driving torque which, in the exemplary embodiment illustrated here, lies above 80 Nm.

[0035] Furthermore, it can be seen that the amplitude between the high and low torques, which can lie in a range of 50 Nm to 200 Nm, is approximately 80 to 100 Nm in the exemplary embodiment illustrated here.

[0036] As already explained, the effective value of the excitation power does not, however, contribute to the propelling of the BEV. On the contrary, the oscillating excitation with currents of differing magnitude means that the vehicle body is braced to differing degrees counter to the braking force. Although the vehicle is at a standstill and braked to provide the racing start, the driver thereby now experiences the force of the electric motor since the bracing counter to the braking force has the effect of a slight movement or vibration of the bodywork.

[0037] FIG. 2 is a flow diagram comprising the method steps for controlling an electric motor of a BEV for a racing start according to an embodiment of the present disclosure. By simultaneous actuation of the brake pedal and the gas pedal, a corresponding signal for activating the launch control is received by a control device of the BEV in a first step S1. In a second step S2, upon receipt of the signal, the vibration mode is triggered in accordance with the excitation scheme usable for this purpose and illustrated by way of example in FIG. 1. The electric motor is excited here in a third step S3 in accordance with the excitation scheme with an oscillating electric excitation power, the effective value of which does not contribute to propelling the BEV.