Method and device for testing electrical energy storing systems for driving vehicles

• US 10,324,136 B2
• Filed: 05/24/2013
• Issued: 06/18/2019
• Est. Priority Date: 05/24/2012
• Status: Active Grant

• Current Assignee: AVL List GmbH (List Privatstiftung)
• Original Assignee: AVL List GmbH (List Privatstiftung)
• Inventors: Konig, Oliver, Jakubek, Stefan, Prochart, Gunter, Gschweitl, Kurt
• Primary Examiner(s): Satanovsky, Alexander
• Application Number:
  US14/402,841
• Publication Number:
  US 20150112620A1
• Time in Patent Office: 2,216 Days
• Field of Search: 702 58, 702 60, 702 63, 702120, 702136, 702157, 702158, 702188, 307151, 320128
• CPC Class Codes: B60L 2210/30 AC to DC converters
• CPC Class Codes: B60L 2240/547 Voltage
• CPC Class Codes: B60L 2240/549 Current
• CPC Class Codes: B60L 58/12 responding to state of charge [SoC]
• CPC Class Codes: G01R 31/3647 for determining the ability of a battery to perform a critical function, e.g. cranking
• CPC Class Codes: G01R 31/367 Software therefor, e.g. for battery testing using modelling or look-up tables
• CPC Class Codes: G01R 31/387 Determining ampere-hour charge capacity or SoC
• CPC Class Codes: G01R 31/389 Measuring internal impedance, internal conductance or related variables
• CPC Class Codes: H02M 3/1584 with a plurality of power processing stages connected in parallel
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility

Abstract

A method for testing electrical energy storage systems for driving vehicles provides that the load current of the energy storage system traces by means of a control loop, if possible without delay, a reference current that varies over time according to predetermined test cycles. The control loop is created by means of a model-based controller design method in which a model of the impedance of the energy storage system is integrated in the model of the controlled system.

Claims

1. A method for testing electrical energy storage systems for driving vehicles, comprising:

generating a load current of the energy storage system with a battery tester;

measuring the load current of the energy storage system using a sensor;

providing a reference current;

controlling the load current of the energy storage system so that a difference between the load current and the reference current is minimized by using a control loop with a model of the battery tester;

wherein the control loop is created by means of a model-based controller design method, in which a model of the energy storage system as a load is integrated in the model of the battery tester.

2. The method according to claim 1, further comprising:

connecting the electrical energy storage system as the load to the battery tester;

applying an excitation sequence to the electrical energy storage system by the battery tester by means of a preliminary controller without a load model;

acquiring measurement data at the electrical energy storage system;

identifying from said measurement data a load model by means of an identification method; and

integrating the identified load model into the model of the battery tester.

3. The method according to claim 1, further comprising:

identifying parameters for a generic model of a battery impedance by at least one short excitation sequence and measurement of the resulting values of current and voltage.

4. A device for testing electrical energy storage systems for driving vehicles, comprising:

a battery tester for generating a load current of the energy storage system;

a sensor for taking a measurement of the load current of the energy storage system;

a control loop, including computer instructions executing on a computer readable medium, with a model of the battery tester, the control loop adapted to minimize a difference between the measurement of the load current of the energy storage system and a reference current;

wherein a model-based control is implemented in the control loop and, in a model of the model-based control, a model of the energy storage system as a load is integrated.

5. The device according to claim 4, wherein a model of a battery impedance is integrated, which model depends on an operating point of a battery.

6. The device according to claim 4, wherein a model of a battery impedance is integrated, which model depends on a state of charge of a battery.

7. The device according to claim 4, wherein a model of a battery impedance is integrated, which model depends on an age of a battery.

8. The device according to claim 4, wherein a model-based predictive control is implemented in the control loop.

9. The device according to claim 4, wherein a model of a battery impedance is represented as a transfer function of second or higher order.

10. The device according to claim 4, further comprising a controller having a processor, the controller implementing the model-based control.

11. The device according to claim 10, wherein model parameters are constantly estimated during operation and the controller is constantly redesigned using the estimated model parameters.

12. The device according to claim 4, wherein the battery tester comprises a controlled buck converter having three IGBT half bridges.

13. The device according to claim 4, wherein a current control is not influenced by a unit under test.