Temperature compensated battery parameter estimation

摘要

A vehicle is provided with a vehicle system having an electric machine and a battery. The electric machine is configured to provide drive torque and the battery supplies power to the electric machine. The vehicle also includes a controller that is configured to generate output indicative of at least one of a battery power capability and a battery state of charge using a filter having a variable EKF gain factor based on battery temperature.

主权项

1. A vehicle comprising:
an electric machine configured to provide drive torque; a battery for supplying power to the electric machine; and a controller configured to:
select a gain factor from predetermined data based on battery temperature, wherein the gain factor corresponds to a constant value above a threshold battery temperature and increases as the battery temperature decreases below the threshold battery temperature;estimate a variable gain based on the gain factor;estimate battery equivalent circuit model (ECM) parameters based on the variable gain; andgenerate output indicative of at least one of a battery power capability and a battery state of charge using a filter based on the battery ECM parameters.