Control device and control method for friction engagement element
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsDaisuke Inoue, Tadashi Tamura, Hiroji Taniguchi
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Abstract
An ECT_ECU executes a program including the step of prohibiting a lockup clutch from engaging if the lockup clutch is disengaged and a number of revolutions or speed NE of an input shaft of a torque converter minus a number of revolutions or speed NT of an output shaft of the torque converter is smaller than a threshold value ΔN (1).
Claims6
A control device for a friction engagement element provided internal to a fluid coupling that couples a power source and a transmission together to allow said fluid coupling to have input and output shafts thereof mechanically coupled together, comprising:
- an operation unit, wherein said operation unit controls a state of said friction engagement element, said operation unit determines whether said friction engagement element is disengaged, and if said friction engagement element is disengaged and a number of revolutions of said input shaft of said fluid coupling continues to be larger than that of revolutions of said output shaft of said fluid coupling for a period of time shorter than a predetermined period of time, said operation unit prohibits said friction engagement element from engaging.
A control device for a friction engagement element provided internal to a fluid coupling that couples a power source and a transmission together to allow said fluid coupling to have input and output shafts thereof mechanically coupled together, comprising
- control means for controlling a state of said friction engagement element;
- determination means for determining whether said friction engagement element is disengaged;
- and
- prohibition means for prohibiting said friction engagement element from engaging if said friction engagement element is disengaged and a number of revolutions of said input shaft of said fluid coupling continues to be larger than that of revolutions of said output shaft of said fluid coupling for a period of time shorter than a predetermined period of time.
A method of controlling a friction engagement element provided internal to a fluid coupling that couples a power source and a transmission together to allow said fluid coupling to have input and output shafts thereof mechanically coupled together, comprising the steps of:
- controlling a state of said friction engagement element;
- determining whether said friction engagement element is disengaged;
- and
- prohibiting said friction engagement element from engaging if said friction engagement element is disengaged and a number of revolutions of said input shaft of said fluid coupling continues to be larger than a number of revolutions of said output shaft of said fluid coupling for a period of time shorter than a predetermined period of time.
Dependencies are inferred from the claim text.