Online Vehicle Battery Capacity Diagnosis System and Method

Abstract

A vehicle includes a traction battery. The vehicle also includes a controller programmed to generate an estimate of the capacity of the traction battery and responsive to the amount of energy supplied to the traction battery during the charge cycle being less than the estimated amount of energy stored in the traction battery during the charge cycle , while detecting that the capacity of the traction battery has changed, and changing the operating strategy of the traction battery until the capacity estimate is updated.

Description

technical field [0001] The present application generally relates to a system for estimating the battery capacity of a vehicle traction battery. Background technique [0002] Hybrid and electric vehicles include high-voltage traction batteries that provide stored electrical energy for propulsion and other vehicle functions. The performance of traction batteries may vary over time. For example, the maximum amount of energy that a traction battery can store typically decreases over time. Contents of the invention [0003] A vehicle powertrain system includes a controller programmed to operate a traction battery within a first state-of-charge range and responsive to a magnitude of energy provided to the traction battery during a charge cycle being less than an estimated amount of energy stored during the charge cycle The amount of energy in the traction battery operates the traction battery within a second state-of-charge range narrower than the first state-of-charge. [00...

AI Technical Summary

Problems solved by technology

Traction battery performance may vary over time

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