US 11,718,184 B2
Resolver offset detection
Jonathan Hair, Royal Oak, MI (US); Jonathan Andrew Butcher, Farmington, MI (US); Mohammad Sameer Khan, Windsor (CA); and Brendan F. Diamond, Grosse Pointe, MI (US)
Assigned to Ford Global Technologies, LLC, Dearborn, MI (US)
Filed by FORD GLOBAL TECHNOLOGIES, LLC, Dearborn, MI (US)
Filed on Oct. 29, 2021, as Appl. No. 17/514,213.
Prior Publication US 2023/0137049 A1, May 4, 2023
Int. Cl. G05B 19/31 (2006.01); B60L 15/20 (2006.01); H02K 24/00 (2006.01); G05B 19/35 (2006.01)
CPC B60L 15/20 (2013.01) [G05B 19/351 (2013.01); H02K 24/00 (2013.01); B60L 2240/421 (2013.01); B60L 2240/423 (2013.01); G05B 2219/42074 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A vehicle comprising:
an electric machine having a rotor and a stator;
a resolver configured to measure a position of the rotor relative to the stator; and
a controller programmed to,
based on the position and a resolver offset, inject a first current having only a d-axis component into the electric machine, and
responsive to detecting a first motion output of the electric machine being greater than a threshold, adjust the resolver offset according to a magnitude and direction of the first motion output, wherein the first motion output includes at least one of a speed output or a torque output.