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SHIFT CONTROL APPARATUS OF CONTINUOUSLY VARIABLE TRANSMISSION

  • US 20130138309A1
  • Filed: 11/21/2012
  • Published: 05/30/2013
  • Est. Priority Date: 11/26/2011
  • Status: Active Grant
First Claim
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1. A shift control apparatus of a continuously variable transmission configured to steplessly vary a torque inputted from an engine to an input rotating member and configured to transmit the steplessly-varied torque to an output rotating member, comprising:

  • an acceleration intention determination section for determining whether a driver'"'"'s acceleration intention is present or absent;

    a shift mode setting section for setting a shift-control mode of the continuously variable transmission to an acceleration mode in which a target rotational speed of the input rotating member is set to a higher rotational speed than that of a normal mode, when it has been determined that the driver'"'"'s acceleration intention is present;

    a target transmission ratio setting section for setting a target transmission ratio based on an accelerator opening To and a vehicle speed V from a map provided for each of the normal mode and the acceleration mode;

    a shift speed setting section for setting a shift speed based on the target transmission ratio and the vehicle speed V;

    a shift control section for controlling a shift of the continuously variable transmission based on at least the target transmission ratio and the shift speed set by the shift speed setting section; and

    a demanded degree determination section for determining a demanded degree of the driver'"'"'s acceleration intention when the shift-control mode has been set to the acceleration mode,wherein the shift control section is also configured to execute a downshift in the acceleration mode at a shift speed slower than the shift speed set by the shift speed setting section, when it has been determined that the demanded degree of the driver'"'"'s acceleration intention is lower than or equal to a predetermined value, and further configured to execute the downshift in the acceleration mode at the shift speed set by the shift speed setting section, when it has been determined that the demanded degree of the driver'"'"'s acceleration intention is higher than the predetermined value.

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