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Travel energy learning device, and method

  • US 8,600,672 B2
  • Filed: 04/08/2009
  • Issued: 12/03/2013
  • Est. Priority Date: 05/27/2008
  • Status: Expired due to Fees
First Claim
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1. A travel energy learning device comprising:

  • a road section identifying unit that identifies a road section where a host vehicle is currently located, the host vehicle including an internal combustion engine and a motor;

    a work rate information deriving unit that derives a work rate of a transmission shaft based on a rotational speed of the transmission shaft and a torque transmitted by the transmission shaft, the transmission shaft being configured to transmit a driving force from the internal combustion engine and the motor to a wheel of the host vehicle; and

    an energy information accumulating unit that derives information that indicates the energy required for traveling the road section based on the derived work rate during travel of the host vehicle through the road section, links the derived information that indicates the energy required for traveling the road section to the road section, and accumulates the information that indicates the energy required for traveling the road section;

    wherein;

    the energy information accumulating unit accumulates plurality of information that indicates the derived energy required for traveling the specific road section, responsive to a plurality of travels by the host vehicle on the specific road section;

    the energy information accumulating unit comprises a first accumulating unit, a second accumulating unit, and a deviation determining unit;

    the first accumulating unit;

    links the information that indicates energy required for current travel to the road section and accumulates such information if an accumulated quantity of information that indicates energy linked to a currently traveled road section and already accumulated by the first accumulating unit is below a predetermined quantity; and

    links the information that indicates energy required for current travel to the road section and accumulates such information, and also discards the information that indicates the energy required for traveling the road section that corresponds to the oldest traveled road section accumulated by the first accumulating unit if the accumulated quantity of information that indicates energy linked to the currently traveled road section accumulated by the first accumulating unit has reached the predetermined quantity;

    the second accumulating unit;

    links the information that indicates energy required for current travel to the road section and accumulates such information if an accumulated quantity of information that indicates energy linked to the currently traveled road section and already accumulated by the second accumulating unit is below a predetermined quantity; and

    links the predetermined quantity of information that indicates energy to the road section and accumulates such information, and also excludes information that indicates energy that has a largest absolute value with respect to the difference of the information that indicates energy required among the predetermined quantity of information that indicates energy already accumulated by the second accumulating unit and the information that indicates energy required for current travel, with a median value of the predetermined quantity of information that indicates energy already accumulated by the second accumulating unit, if the accumulated quantity of information that indicates energy linked to the currently traveled road section and already accumulated by the second accumulating unit has reached the predetermined quantity; and

    the deviation determining unit determines whether the median value of the information that indicates the energy required for traveling the road section linked to the currently traveled road section that is accumulated in the first accumulating unit deviates from the median value of the information that indicates the energy required for traveling the road section linked to the road section that is accumulated in the second accumulating unit by at least a predetermined value, wherein if there is deviation by at least the predetermined value, then the information that indicates the energy required for traveling the road section accumulated in the second accumulating unit is overwritten with the information that indicates the energy required for traveling the road section accumulated in the first accumulating unit.

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