Motor control based on power electronics temperatures

An electric drive system comprising:

• a controller implementing:
• a power device loss computation module programmed to estimate a power dissipation rate of a switch on a substrate in a power electronics module;
• a temperature estimation module programmed to estimate a temperature of the substrate based on the estimated power dissipation rate, a coolant temperature, and a coolant flow rate value provided by a coolant system;
• and
• a power electronics protection module programmed to reduce a motor torque in response to the estimated temperature of the substrate differing from a substrate temperature measurement by a difference threshold.

A method, comprising:

• controlling switches in an inverter to adjust a motor torque;
• cooling a substrate of the inverter with a coolant;
• measuring a temperature of the substrate of the inverter;
• and
• reducing the motor torque in response to the measured temperature exceeding an estimated temperature of the substrate by more than a difference threshold, wherein the estimated temperature of the substrate is output by a dynamic model having a flow rate of the coolant as an input.