Method for Controlling a State of Charge of a Vehicle Battery

Patent metadata

Field	Value
Publication number	US-2016016485-A1
Application number	US-201514869128-A
Country	US
Kind code	A1
Filing date	Sep 29, 2015
Priority date	Apr 3, 2013
Publication date	Jan 21, 2016
Grant date	—

Abstract

A method is provided for controlling a state of charge of a vehicle battery in order to ensure the starting capability of the vehicle. A battery temperature prediction for the vehicle battery is determined and the battery temperature prediction is used to determine a lower state-of-charge limit of the vehicle battery. The amount of charge in the vehicle battery is controlled in such a way that the state of charge of the battery at least does not fall below the lower state-of-charge limit. Data of a navigation system integrated in the vehicle or coupled to the vehicle are taken into account in the determination of the battery temperature prediction.

First claim

What is claimed is:

1 . A method for controlling a state of charge of a vehicle battery in order to ensure startability of a vehicle, the method comprising the acts of:
ascertaining a battery-temperature prediction for the vehicle battery; using the ascertained battery-temperature prediction in order to determine a lower state-of-charge limit of the vehicle battery, wherein
a charge amount in the vehicle battery is controlled such that the state of charge of the vehicle battery at least does not fall below the lower state-of-charge limit, and
data of a navigation system integrated in the vehicle or coupled with the vehicle are taken into account in the act of ascertaining the battery-temperature prediction for the vehicle battery.

2 . The method according to claim 1 , wherein the data of the navigation system taken into account in ascertaining the battery-temperature prediction comprises information of a future position of the vehicle.

3 . The method according to claim 2 , wherein the data of the navigation system taken into account in ascertaining the battery-temperature prediction comprises an indication of a presumed parking position of the vehicle.

4 . The method according to claim 1 , wherein the data of the navigation system taken into account in ascertaining the battery-temperature prediction comprises an indication of a presumed parking position of the vehicle.

5 . The method according to claim 1 , wherein position data of a planned or presumed route based on user behavior of a driver of the vehicle are taken into account in ascertaining the battery-temperate prediction.

6 . The method according to claim 5 , wherein the position data is destination position data of the planned or presumed route based on the user behavior of the driver.

7 . The method according to claim 3 , wherein position data of a planned or presumed route based on user behavior of a driver of the vehicle are taken into account in ascertaining the battery-temperate prediction.

8 . The method according to claim 7 , wherein the position data is destination position data of the planned or presumed route based on the user behavior of the driver.

9 . The method according to claim 3 , wherein the data of the navigation system are taken into account in ascertaining the battery-temperature prediction such that current or forecast outside-temperature data at the presumed parking position are taken into account.

10 . The method according to claim 5 , wherein the data of the navigation system are taken into account in ascertaining the battery temperature prediction such that current or forecast outside-temperature data along the planned or presumed route are taken into account.

11 . The method according to claim 8 , wherein the data of the navigation system are taken into account in the ascertaining of the battery-temperature prediction such that current or forecast outside-temperature data within a range of the destination position data of the planned or presumed route of the navigation system are taken into account.

12 . The method according to claim 9 , wherein the forecast outside temperature is received by a telematics terminal from an external provider.

13 . The method according to claim 12 , wherein the external provider is a weather service.

Assignees

• Bayerische Motoren Werke Ag

Inventors

• Deisler Christopher

Classifications

• B60L11/1861

  Operations & Transport · mapped topic

• G01C21/26

  specially adapted for navigation in a road network · CPC title

• B60L11/1872 Primary

  Operations & Transport · mapped topic

• B60L58/25

  by controlling the electric load · CPC title

• Y02T10/70

  Energy storage systems for electromobility, e.g. batteries · CPC title