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Vehicle control device and vehicle drive system for implementing a one-way transmission speed or engaging a first engaging element in an idle stop state

  • US 8,280,599 B2
  • Filed: 01/28/2010
  • Issued: 10/02/2012
  • Est. Priority Date: 03/25/2009
  • Status: Active Grant
First Claim
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1. A vehicle control device for controlling a vehicle drive device that includes an input member that is drive coupled to an engine, an output member that is drive coupled to a wheel, an electric pump that is driven by electric power and discharges working fluid, and a transmission apparatus that has a plurality of engaging elements, that switches a plurality of shift speeds by controlling engaging and releasing of the plurality of the engaging elements, and that transmits to the output member a rotational driving force of the input member by shifting the rotational driving force at gear ratios of the plurality of the shift speeds, whereinthe transmission apparatus is provided with, as one of the plurality of the shift speeds, a one-way transmission speed at which the rotational driving force is transmitted from the input member to the output member and the rotational driving force is not transmitted from the output member to the input member;

  • the vehicle control device is provided with a control unit that controls the transmission apparatus to implement the one-way transmission speed in an idle stop state in which the vehicle is in a moving state and the engine is stopped;

    in a case where a travel speed of the vehicle is not greater than a predetermined release threshold value, the one-way transmission speed is implemented by a hydraulic pressure from the electric pump; and

    in a case where the travel speed of the vehicle is greater than the predetermined release threshold value, all of the engaging elements are released.

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