Loss approximation techniques for electrified vehicle dc-dc boost converters through quadratic fitting

A DC-DC boost converter control method for a DC-DC boost converter of an electrified powertrain of an electrified vehicle, the DC-DC boost converter control method comprising:

• storing, by a memory of the electrified vehicle, a two-dimensional (2D) loss model for the DC-DC boost converter, the 2D loss model defining (i) a plurality of different sets of quadratic polynomial coefficients for (ii) a plurality of output voltages of the DC-DC boost converter, respectively;
• accessing, by a control system of the electrified vehicle and from a memory, the 2D loss model for the DC-DC boost converter;
• determining, by the control system and based on a driver torque request, a desired output power and a desired output voltage for the DC-DC boost converter;
• determining, by the control system, a particular set of quadratic polynomial coefficients for the desired output voltage for the DC-DC boost converter to obtain a desired quadratic polynomial function representing a loss of the DC-DC boost converter to generate the desired output power at the desired output voltage;
• estimating, by the control system and using the desired quadratic polynomial function, the loss of the DC-DC boost converter to achieve the driver torque request;
• and
• controlling, by the control system, the electrified powertrain based on the estimated loss of the DC-DC boost converter.