Parameter and state limiting in model based battery control
AssigneeFord Global Technologies, LLC
InventorsYonghua Li, Xu Wang
Life of this patent
Estimating the term…
Abstract
A method of determining battery power capability may include: determining a circuit model for a battery, including a first resistance (r1) in series with a second resistance (r2) and a capacitance (C) in parallel; setting upper and lower limits for r1, r2 and C based on a battery temperature a battery state of charge or both; applying an EKF to determine r1, r2 and C within the set upper and lower limits; and outputting the battery power capability based on r1, r2 and C. The upper and lower limits may be adjusted based on the age of the battery.
Claims20
A method comprising:
- employing a battery circuit model, including a first resistance (r1) in series with a second resistance (r2) and a capacitance (C) in parallel to r2;
- measuring a temperature of a battery;
- setting upper and lower limits for r1, r2 and C based on the measured temperature;
- determining a battery power capability by applying an Extended-Kalman-Filter to determine values for r1, r2 and C within the set limits;
- controlling power sent from the battery to a motor providing motive power to vehicle wheels within limits that are based on the determined battery power capability.
A method comprising:
- employing a battery circuit model, including a first resistance (r1) in series with a second resistance (r2) and a capacitance (C) in parallel to r2;
- measuring a state-of-charge of a battery;
- setting upper and lower limits for r1, r2 and C based on the measured state-of-charge;
- determining a battery power capability by applying an Extended-Kalman-Filter to determine values for r1, r2 and C within the set limits;
- controlling power sent from the battery to a motor providing motive power to vehicle wheels within limits that are based on the battery power capability.
An electric vehicle comprising:
- a motor configured to provide motive power to vehicle wheels;
- a battery configured to provide power to the motor;
- a controller configured to (a) estimate battery power capability by applying a battery circuit model, including a first resistance (r1) in series with a second resistance (r2) and a capacitance (C) in parallel to r2;
- setting upper and lower limits for r1, r2 and C based on a measured battery temperature;
- and applying an Extended-Kalman-Filter to determine values for r1, r2 and C within the set limits;
- and (b) control power sent from the battery to the motor within limits that are based on the determined values for r1, r2 and C.
Dependencies are inferred from the claim text.