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Shift control device for vehicle

  • US 10,221,942 B2
  • Filed: 05/07/2013
  • Issued: 03/05/2019
  • Est. Priority Date: 05/07/2013
  • Status: Expired due to Fees
First Claim
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1. A shift control device for a vehicle, the vehicle including an automatic transmission, the shift control device comprising:

  • an electronic control unit configured to;

    i) set a target gear stage based on data showing traveling states, including at least a driving demand;

    ii) set a neutral state, where power is not transmitted, by releasing an engagement mechanism engaged such that a predetermined gear stage is set in the automatic transmission, when a predetermined condition is satisfied during traveling, such that coasting is allowed;

    iii) eliminate the neutral state, when the predetermined condition is not satisfied during the coasting in the neutral state, by engaging the engagement mechanism;

    iv) calculate a virtual gear stage, when the predetermined condition is not satisfied during the coasting in the neutral state, such that the virtual gear stage is set as a gear stage of the automatic transmission at which a rotation speed is closest to an input rotation speed, the virtual gear stage being calculated based on a vehicle speed at a time point when the virtual gear stage is calculated and a gear ratio at a gear stage allowed to be set in the automatic transmission;

    v) control a first shift of the automatic transmission, when the neutral state is eliminated, such that a first shift change between a current gear stage during the neutral state and the virtual gear stage is initiated, and a second shift change toward the target gear stage is initiated during the first shift; and

    vi) supply hydraulic pressure for forming the target gear stage to the engagement mechanism before the first shift is completed.

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