Arrangement for Determining an Initial Internal Battery Temperature

• US 20070093952A1
• Filed: 07/11/2006
• Published: 04/26/2007
• Est. Priority Date: 07/11/2005
• Status: Abandoned Application

• Current Assignee: Daimler Chrysler Corporation (Mercedes-Benz Group AG)
• Original Assignee: Daimler Chrysler Corporation (Mercedes-Benz Group AG)
• Inventors: Wu, Zhijian, Han, Min, Tu, Yijun, Trumbo, Michel
• Application Number:
  US11/456,789
• Publication Number:
  US 20070093952A1
• Time in Patent Office: Days
• US Class Current: 701/99
• CPC Class Codes: B60L 2260/56 Temperature prediction, e.g. for pre-cooling
• CPC Class Codes: B60L 58/10 for monitoring or controlling batteries
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

A method and arrangement is provided for estimating an initial value for an internal battery temperature of a vehicle using a four zone process that determines which of a predetermined set of time zones correlates with a measured period of time for an engine of the vehicle being in an engine-off condition. Once the time zone is determined, an initial estimated value of the internal temperature of the battery is determined as a function of a set of parameters correlated with the determined time zone. The set of time zones include a holding time zone, a model based estimation time zone which is greater in time than the holding time zone, a first self-adjustment zone which is greater in time than the model based estimation time zone, and a second self-adjustment time zone which is greater in time than the first self-adjustment time zone.

Claims

1. A method of estimating an initial value for an internal temperature of a vehicle battery comprising:

determining which of a predetermined set of time zones correlates with a measured period of time for an engine of the vehicle being in an engine-off condition; and

determining an initial estimated value of the internal temperature of the battery as a function of a set of parameters correlated with the determined time zone.

2. The method of claim 1 wherein the time zones are categorized as four different possible time zones comprising a holding time zone, a model based estimation time zone which is greater in time than the holding time zone, a first self-adjustment zone which is greater in time than the model based estimation time zone, and a second self-adjustment time zone which is greater in time than the first self-adjustment time zone.

3. The method of claim 2 wherein in the holding time zone, the initial temperature value is determined as a function of an internal battery temperature predicted a the time the engine is placed in the engine-off condition.

4. The method of claim 2 wherein in the model based estimation time zone, the initial temperature value is determined as a function of:

battery temperature predicted at engine-off, coolant temperature measured at engine-off, ambient temperature measured at engine-off, coolant temperature measured at engine-on, and ambient temperature measured at engine-on.

5. The method of claim 2 wherein in the first self-adjustment time zone, the initial temperature value is determined as a function of ambient temperature measured at engine-on, and charge air temperature measured at engine-on.

6. The method of claim 2 wherein in the second self-adjustment time zone, the initial temperature value is determined as a function of charge air temperature measured at engine-on.