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State of Charge control Disclosure Number: IPCOM000246895D
Publication Date: 2016-Jul-13
Document File: 9 page(s) / 90K

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A method for controlling a charging level, such as the SOC, of a battery (4) in a hybrid vehicle (1), wherein the charging level (SOC) of the hybrid battery (4) is monitored (201) and charging area along the drive route are identified (202). The charging control method includes switching (205) to electric drive in view of the SOC and the identified charging areas. The switching (205) is performed at distance to the charging area in order to take full advantage of the charging area by planning and lowering the SOC before the charging area, so that for example re-generative charging can be made for an anticipated downhill slope along the route, without risking overcharging the hybrid battery (4).

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Page 01 of 9


Title: State of Charge control

Technical Field

The present invention relates to hybrid motor vehicles, especially land motor vehicles, which comprises an internal combustion engine and an electric


machine, and which electric machine may act as a motor to propel the hybrid vehicle and as a generator to retrieve energy from the hybrid vehicle in motion.

Background and Prior Art

Hybrid motor vehicles with internal combustion engines normally includes an


electric machine that can both be used as a motor for propelling the vehicle, and as a generator in order retrieve energy to the hybrid battery of the vehicle when for example driving downhill. Some hybrid motor vehicles are so called plug-in hybrids that may also be charged from an external charger.


Retrieving energy (or re-generative charging) during driving contributes to a good fuel economy. However, there is a risk that the hybrid battery is already fully charged and cannot take advantage of re-generative charging of the hybrid battery when for example driving downhill. If the hybrid battery is fully charged, the energy cannot be retrieved and is wasted.


Summary of Invention

An aim of the invention is to enable a better use of electric energy in a hybrid vehicle.


A further aim is to avoid the hybrid battery becoming overcharged.

Brief Description of Drawings

Figure 1 illustrates some parts of a hybrid vehicle relevant for describing the present invention.


Figure 2 illustrates a method for controlling charging.

Page 02 of 9


Description of Embodiments

Figure 1 shows parts of a hybrid motor vehicle 1. The motor vehicle 1 comprises an internal combustion engine 2 and a hybrid system 3 comprising a battery 4, an AC/DC converter 5 and an electric machine 6. The hybrid vehicle 1 also include a control unit 7 and a navigation system 8. Especially, the control

unit 7 is configured to control the state of charge of the hybrid battery 4 by selecting to propel the hybrid vehicle 1 by means of the electric machine 6, or to charge the hybrid battery 4, for example by retrieving energy while driving. The navigation system 8 comprises a positioning unit 11, e.g. GPS, a maps unit 12, topology information 13, and a route planner 14. The positioning unit 11 is

configured to provide the position of the vehicle, e.g. longitude/latitude coordinates. The maps unit 12 includes information of roads and has stored map information that may be retrieved in view of the position. The route planner 14 is configured to store travelling routes, for example added by the driver, and give guidance to the driver via a user interface, such as a screen 15. The route

planner 14 is also configured to store information on charging stations along the route, e.g. the driver should be able to indicate planned stops at charging stations.

The control unit 7 is communicatively connected to the navigation system 8 and

configured to use the navigation information for the travelled route, which includes the...