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Method and a device for operating an electrically driven motor vehicle

  • US 9,037,325 B2
  • Filed: 08/23/2011
  • Issued: 05/19/2015
  • Est. Priority Date: 08/24/2010
  • Status: Active Grant
First Claim
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1. A method for operating an electrically driven motor vehicle having a battery-fed electric drive motor and a generator-coupled internal combustion engine for providing electric energy for a battery, the internal combustion engine being operated based on a state of charge of the battery, the method comprising the acts of:

  • (a) determining a route to a destination via a navigation system;

    (b) checking whether the destination will be reached or whether there is a range gap to the destination based on the determined route, a detected charge level of the battery, and a detected energy consumption;

    (c) when there is the range gap, determining whether the destination is reachable in at least one defined energy saving operating mode in which energy consumption is decreased or whether the destination is reachable only in a REX operating mode;

    (d) providing a recommendation to a driver to activate the energy saving operating mode or the REX operating mode based on the determination, wherein the internal combustion engine operates in the REX operating mode; and

    (e) automatically activating the REX operating mode if the REX operating mode is determined to be necessary to bridge the range gap when no decision is made by the driver.

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