Ford Global Technolgoies, LLC

Justin T Hughes

Marcelo Araujo Xavier

Yonghua Li

Qi Jiao

A traction battery controller of an electrified vehicle dynamically selects an estimation gain based on an operating condition of the vehicle and controls the vehicle according to a state (e.g., a state-of-charge (SOC)) of the traction battery estimated from an equivalent circuit model of the traction battery that depends on the estimation gain. The operating condition of the vehicle may be indicative of on-board energy (OBE) or a power demand of the vehicle. In operation, the controller selects the estimation gain to be (i) a high estimation gain during a first operating condition of the vehicle, whereby compared to a nominal estimation gain the battery state is estimated at an increased speed but with lower accuracy and (ii) a low estimation gain during a second operating condition of the vehicle, whereby compared to the nominal estimation gain the battery state is estimated with greater accuracy but at a decreased speed.

Traction battery controller providing fast and accurate state of charge status

After start of a vehicle following a parking event having a duration that exceeds a duration threshold, a controller may adjust a maximum output power of a traction battery responsive to temperatures of the traction battery, derived from a temperature of the traction battery at a beginning of the parking event, ambient temperature during the parking event, and the duration, exceeding a first threshold difference.

Temperature based control of vehicle battery

A controller discharges a traction battery according to power limits defined by output that is indicative of a state of charge of the traction battery and is updated by a bar delta filter according to a balancing current. The balancing current is associated with each cell of a string of series connected cells of the traction battery and represents a deviation of an estimated current through the cell from a total current of the string.

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Allen Park, MI, United States of America

Justin T Hughes