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Control apparatus for automatic transmission

  • US 5,911,646 A
  • Filed: 12/30/1996
  • Issued: 06/15/1999
  • Est. Priority Date: 12/28/1995
  • Status: Expired due to Fees
First Claim
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1. A control apparatus for an automatic transmission comprising:

  • a transmission mechanism for providing a plurality of transmission ratios for a vehicle;

    an input clutch provided between the transmission mechanism and an engine;

    a hill-hold brake for preventing rotation of an output shaft of the transmission mechanism;

    a neutral control for disengaging the input clutch and for engaging the hill-hold brake when the vehicle in a forward drive range is halted, said neutral control including gradual changing means for providing simultaneous gradual changes in disengaging and engaging forces of the input clutch and the hill-hold brake so that the engaging force of said input clutch in a slip region thereof is gradually changed while an engaging force of said hill-hold brake is gradually changed in a direction opposite to the direction in which said engaging force of said input clutch is changed to prevent transmission shock and vehicle roll-back on a hill incline;

    a torque converter; and

    means for detecting an input/output rotational-speed ratio of said torque converter, as said engaging force of said input clutch is changed, said gradual changing means changing the engaging force of said hill-hold brake in accordance with the detected input/output rotational-speed ratio.

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