Battery controller with monitoring logic for model-based battery control

Patent metadata

Field	Value
Publication number	US-9716294-B2
Application number	US-201213451879-A
Country	US
Kind code	B2
Filing date	Apr 20, 2012
Priority date	Apr 20, 2012
Publication date	Jul 25, 2017
Grant date	Jul 25, 2017

Abstract

A battery controller with monitoring logic for a model-based battery control of a battery performs battery current characterizing, parameter and state variable abnormality detection, and bound checking of error signals between measured and predicted output variables to generate an output. Switching between closed-loop operation (i.e., the model-based battery control) and open-loop operation (i.e., a traditional battery control) is done based on the output of the monitoring logic such that closed-loop stability and performance are reasonably guaranteed.

First claim

What is claimed is:

1. A method comprising:
monitoring, by a controller in communication with a battery, a battery variable;
using, by the controller, a closed-loop operation to control the battery while a difference between an estimate of the battery variable estimated from the closed-loop operation and the battery variable is within a predetermined range; and
using, by the controller, an open-loop operation to control the battery while the difference is out of the predetermined range.

2. The method of claim 1 wherein:
the battery variable is current of the battery.

3. The method of claim 1 wherein:
the predetermined range varies based on temperature of the battery.

4. The method of claim 1 further comprising:
detecting whether the difference is within a minimal bound less than a predetermined acceptable bound;
initializing the open-loop operation when the difference is within the minimal bound; and
storing learned parameters when the difference is within the minimal bound.

5. The method of claim 1 wherein:
the closed-loop operation includes a model-based battery control.

6. A system comprising:
a controller having an estimator and a supervisor;
wherein the estimator is configured to use a closed-loop operation and an open-loop operation for controlling a battery;
wherein the supervisor is configured to select the closed-loop operation while an error difference between an estimate of a battery variable estimated from the closed-loop operation and the battery variable is within a predetermined range and to select the open-loop operation to control the battery otherwise.

7. The system of claim 6 wherein:
the battery variable is current of the battery.

8. The system of claim 6 wherein:
the supervisor is further configured to detect whether the error difference is within a minimal bound less than a predetermined acceptable bound, initialize the open-loop operation when the error difference is within the minimal bound, and store learned parameters when the error difference is within the minimal bound.

9. The system of claim 6 wherein:
the closed-loop operation includes a model-based battery control.

10. A method comprising:
controlling a battery, by a controller in communication with the battery, using one of a closed-loop operation and an open-loop operation at a time; and
switching between using the closed-loop operation to control the battery while a difference between an estimate of a battery variable estimated from the closed-loop operation and the battery variable is within a predetermined range and using the open-loop operation while the difference is outside the range.

11. The method of claim 10 wherein:
the battery variable is current of the battery.

Assignees

• Li Yonghua
• Anderson Richard Dyche
• Phillips Anthony Mark
• Wang Xu
• Ford Global Tech Llc

Inventors

• Li Yonghua
• Anderson Richard Dyche
• Phillips Anthony Mark
• Wang Xu

Classifications

• H01M10/48 Primary

  Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte (constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569) · CPC title

• H02J7/445

  in response to measured battery parameters, e.g. voltage, current or temperature profile · CPC title

• H02J7/44

  between battery management systems and power sources · CPC title

• H01M2010/4271

  Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing · CPC title

• H02J7/485

  with provisions for charging different types of batteries · CPC title