Electric machine drive calibration, verification, and efficiency improvement

An electric machine controller in a vehicle, wherein the electric machine controller has a processor and memory and instructions that are stored in the memory and executable by the processor to:

• calibrate frequency selection or avoidance tables;
• wherein the calibration includes scaling at least one measured frequency response function for torque based on an ideal dynamic motor drive pulse height by a frequency domain multiplication of one of the measured frequency response functions with a frequency domain representation of a waveform with an intended pulsing frequency for different torque levels;
• estimate a number of noise, vibration, harshness (NVH) levels at different locations on the vehicle for different pulsing frequencies and different levels of motor torque;
• compare the estimated NVH levels against at least one calibratable threshold for each different location;
• determine which estimated NVH levels meet or exceed a threshold;
• and
• assuming that pulsing at lower frequencies is more efficient for dynamic motor drive operation, select a frequency of electric machine pulsing that is acceptable for NVH.

An electric machine controller in a vehicle, wherein the electric machine controller has a processor and memory and instructions that are stored in the memory and executable by the processor to:

• monitor operational NVH responses after initial calibration wherein initial calibration includes:
• calibrating frequency selection or avoidance tables;
• wherein the calibration includes scaling at least one measured frequency response function for torque based on an ideal dynamic motor drive pulse height;
• measure NVH operational responses;
• and
• adjust a frequency selection calibration based on the measured NVH operational response at different speeds or torque loads;
• wherein the instructions execute to continue to monitor long term NVH evolution for diagnostic data collection purposes and wherein the diagnostic data is stored in memory.