US 12,222,738 B2
Method and system for controlling electric drive system according to predicted temperature of DC-link capacitor to prevent overheating
Monty J. Anderson, Boise, ID (US); William Robert Brown, Huntington Woods, MI (US); Jogendra Singh Thongam, Windsor (CA); Joseph Sherman Kimmel, Carleton, MI (US); and Papiya Bagchi, Northville, MI (US)
Assigned to Ford Global Technologies, LLC, Dearborn, MI (US)
Filed by Ford Global Technologies, LLC, Dearborn, MI (US)
Filed on Feb. 1, 2022, as Appl. No. 17/590,237.
Prior Publication US 2023/0244257 A1, Aug. 3, 2023
Int. Cl. G05D 23/20 (2006.01); B60L 15/00 (2006.01)
CPC G05D 23/2033 (2013.01) [B60L 15/007 (2013.01); B60L 2210/40 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An electric drive system, comprising:
a power electronics module having a DC-link capacitor and an inverter; and
a controller configured to reduce power output of the inverter while a temperature of the DC-link capacitor, predicted from a thermal equation given a sensed temperature of a power switch of the inverter, a sensed current of the power electronics module, and values of parameters of the thermal equation obtained from a thermal model of the DC-link capacitor, is greater than a threshold to thereby maintain DC-link capacitor temperature lower than the threshold.