Method for controlling tone of electric vehicle based on motor vibration

1. A method for controlling a tone of an electric vehicle (EV) based on motor vibration, the method comprising:

calculating, by a signal processing controller, an order component from a vibration signal of a EV motor;

extracting, by the signal processing controller, an N th order component with the greatest linearity for motor output torque among the calculated order component;

calculating, by the signal processing controller, an order frequency by transforming revolutions per minute (RPM) of the EV motor into a frequency; and

setting, by the signal processing controller, an EV mode tone by applying a vibration level of the N th order component to a level of the order frequency to be output and rearranging the order component;

wherein the extraction of the N th order component includes extracting the first order component with a determination coefficient (R 2 ) greater than or equal to 90 percent.

2. The method of claim 1 , wherein the calculation of the order component includes:

calculating the order component from a vibration sensor configured to sense the vibration signal of the EV motor.

3. The method of claim 2 , wherein the method further comprises:

sweeping frequencies, by the vibration sensor, when a highest amplitude is detected.

4. The method of claim 2 , wherein the vibration sensor is a knocking sensor.

5. The method of claim 1 , wherein the method further comprises:

outputting the set EV mode tone; and

adjusting, by the vibration sensor signal processing controller, an output volume by applying a frequency band pass filter based on the RPM of the EV motor before the outputting.

6. The method of claim 1 , wherein the method further comprises:

outputting the set EV mode tone; and

adjusting an output volume by assigning a weighting value to the RPM of the EV motor before the outputting.

7. The method of claim 1 , wherein the method further comprises:

outputting the set EV mode tone; and

adjusting an output volume by assigning a weighting value to the pedal position before the outputting.

8. The method of claim 1 , wherein the method further comprises:

outputting the set EV mode tone; and

adjusting an output volume by calculating a differential change value of vehicle speed before the outputting.

9. The method of claim 1 , wherein the method further comprises:

selecting the order component according to a change in a traveling mode, wherein the traveling mode comprises a power saving mode, a general mode, and a sport mode; and

using the selected order component when setting the EV mode tone.

10. A method for controlling a tone of an electric vehicle (EV) based on motor vibration, the method comprising:

calculating, by a vibration sensor signal processing controller, an order component from a vibration signal of a EV motor;

extracting, by the vibration sensor signal processing controller, an N th order component with the greatest linearity for motor output torque among the calculated order component;

calculating, by the vibration sensor signal processing controller, an order frequency by transforming revolutions per minute (RPM) of the EV motor into a frequency;

setting, by the vibration sensor signal processing controller, an EV mode tone by applying a vibration level of the N th order component to a level of the order frequency to be output and rearranging the order component; and

outputting the set EV mode tone,

wherein the extracting of the N th order component comprises:

extracting the N th order component by updating a weighting value when the vibration signal is recirculated using an LMS filter algorithm for the vibration signal to cause the level of the N th order component to converge to 0.

11. A method for controlling a tone of an electric vehicle (EV) based on motor vibration, the method comprising:

calculating, by a vibration sensor signal processing controller, an order component from a vibration signal of a EV motor;

extracting, by the vibration sensor signal processing controller, a N th order component with the greatest linearity for motor output torque among the calculated order component;

calculating, by the vibration sensor signal processing controller, an order frequency by transforming revolutions per minute (RPM) of the EV motor into a frequency;

setting, by the vibration sensor signal processing controller, an EV mode tone by applying a vibration level of the N th order component to a level of the order frequency to be output and rearranging the order component; and

outputting the set EV mode tone,

wherein the extracting of the N th order component comprises:

extracting the N th order component through:

performing Fast Fourier Transform (FFT) for the vibration signal;

performing resampling through a Non-equispaced Fast Fourier Transform (NFFT); and

performing an Inverse Fast Fourier Transform (IFFT).

12. A method for controlling a tone of an electric vehicle (EV) based on motor vibration, the method comprising:

calculating, by a vibration sensor signal processing controller, an order component from a vibration signal of a EV motor;

extracting, by the vibration sensor signal processing controller, an N th order component with the greatest linearity for motor output torque among the calculated order component;

calculating, by the vibration sensor signal processing controller, an order frequency by transforming revolutions per minute (RPM) of the EV motor into a frequency;

setting, by the vibration sensor signal processing controller, an EV mode tone by applying a vibration level of the N th order component to a level of the order frequency to be output and rearranging the order component; and

outputting the set EV mode tone,

wherein the extracting of the N th order component comprises:

extracting the N th order component using order tracking analysis for the EV motor and an RPM-based band pass filter.

13. The method of claim 10 , wherein the method further comprises:

sweeping frequencies, by a vibration sensor, when a highest amplitude is detected.

14. The method of claim 13 , wherein the vibration sensor is a knocking sensor.

15. The method of claim 10 , wherein the method further comprises:

adjusting, by an external amplifier signal processing controller, an output volume by applying a frequency band pass filter based on the RPM of the EV motor before the outputting.

16. The method of claim 10 , wherein the method further comprises:

adjusting, by an external amplifier signal processing controller, an output volume by assigning a weighting value to the RPM of the EV motor before the outputting.

17. The method of claim 10 , wherein the method further comprises:

adjusting, by an external amplifier signal processing controller, an output volume by assigning a weighting value to the pedal position before the outputting.

18. The method of claim 10 , wherein the method further comprises:

adjusting, by an external amplifier signal processing controller, an output volume by calculating a differential change value of vehicle speed before the outputting.

19. The method of claim 10 , wherein the method further comprises:

selecting the order component according to a change in a traveling mode, wherein the traveling mode comprises a power saving mode, a general mode, and a sport mode; and

using the selected order component when setting the EV mode tone.