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Shift control apparatus for automatic transmission system

  • US 4,732,055 A
  • Filed: 12/02/1986
  • Issued: 03/22/1988
  • Est. Priority Date: 02/16/1985
  • Status: Expired due to Term
First Claim
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1. A shift control apparatus for an automatic transmission system comprising:

  • a clutch coupled to an output shaft of an engine;

    a parallel-shaft type gear transmission coupled at its input shaft to said clutch;

    a clutch actuator actuating engagement and disengagement of said clutch;

    actuator control means for controlling the operation of said actuator;

    clutch position detecting means for detecting engagement and disengagement of said clutch;

    shift position detecting means for generating a signal indicative of the shift position of said parallel-shaft type gear transmission;

    shift position change-over means for changing the meshing state of said parallel-shaft type gear transmission;

    memory means for storing a plurality of maps representing optimum speed ratios determined on the basis of signals indicative of at least the speed of the vehicle and the position of an accelerator pedal, said maps including at least a map I and a map II in which a vehicle speed to be changed over to a higher speed ratio is set at a higher vehicle speed than said map I;

    operating condition detecting means for detecting the operating condition of the vehicle; and

    automatic shift control means including map selecting means for selecting one of said maps according to information supplied from said operating condition detecting means, said map selecting means selecting said map I when said operating condition detecting means detects that a brake device is in its non-operating state, but selecting said map II when said operating condition detecting means detects that said brake device is in its operating state,optimum speed ratio determining means for determining an optimum speed ratio on the basis of the map selected by said map selecting means and according to the signals indicative of at least the vehicle speed and accelerator position applied from said operating condition detecting means, coincidence judging for judging as to whether or not the shift position detected by said shift position detecting means coincides with the optimum speed ratio determined by said optimum speed ratio determining means, and shift position selecting means for applying a shift signal to said shift position change-over means so as to shift said parallel-shaft type gear transmission to the optimum shift position when non-coincidence is judged by said coincidence judging means.

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