| 摘要 |
In a control apparatus for an automatic transmission having two input shafts connected to an output shaft of a prime mover; two output shafts; and two drive force transmission paths including clutches and synch devices each of which is able to connect a speed gear to the associated one of the output shafts, it is configured to discriminate whether shifting required by an operator is a first shifting pattern or a second shifting pattern, supply fluid pressure to one of the drive force transmission paths associated with a desired speed gear, while engaging the lockup clutch, when the shifting is the first shifting pattern, and supply the fluid pressure to the one of the drive force transmission paths associated with the desired speed gear, while disengaging the lockup clutch, when the shifting is the second shifting pattern. |
| 主权项 |
1. An apparatus for controlling an automatic transmission that inputs drive force from an output shaft of a prime mover mounted on a vehicle through a liquid coupling having a lockup clutch, and changes the drive force in speed, comprising:
at least two input shafts adapted to be connected to the output shaft of the prime mover; an output shaft adapted to be installed in parallel with the input shafts; at least two drive force transmission paths having clutches adapted to be respectively installed between the output shaft of the prime mover and the two input shafts to connect and disconnect the output shaft of the prime mover and the input shafts, and gear selecting mechanisms each adapted to be able to connect one of a plurality of speed gears adapted to define speeds and be disposed between the two input shafts and the output shaft to the output shaft; a fluid pressure supply mechanism adapted to be able to supply fluid pressure to the lockup clutch, the clutches and the gear selecting mechanisms;
a shifting pattern discriminator adapted to discriminate whether shifting required by an operator is a first shifting pattern that includes shifting other than a kick-down shifting or a second shifting pattern that includes the kick-down shifting; and controlling means for controlling a controller adapted to control operation of the fluid pressure supply mechanism by , while engaging the lockup clutch and supplying the fluid pressure to the clutch of one of the drive force transmission paths associated with a present speed gear so that a present speed is established, supplying the fluid pressure to the gear selecting mechanism of other of the drive force transmission paths associated with a desired next speed gear so as to connect the input shaft of the other of the drive force transmission paths to the output shaft via the next speed gear, then after the input shaft and the output shaft are connected, discharging the fluid pressure from the clutch of the one of the drive force transmission paths and supplying the fluid pressure to the clutch of the other of the drive force transmission paths, when it is discriminated that the shifting is the first shifting pattern, whereas, while disengaging the lockup clutch and supplying the fluid pressure to the clutch of the one of the drive force transmission paths associated with the present speed gear so that the present speed is established, supplying the fluid pressure to the gear selecting mechanism of the other of the drive force transmission paths associated with the desired next speed gear so as to connect the input shaft of the other of the drive force transmission paths to the output shaft via the next speed gear, then after the input shaft and the output shaft are connected, discharging the fluid pressure from the clutch of the one of the drive force transmission paths and supplying the fluid pressure to the clutch of the other of the drive force transmission paths, when it is discriminated that the shifting is the second shifting pattern, wherein the controller determines whether required torque required by the operator is greater than a threshold value when it is discriminated to be the second shifting pattern and disengages the lockup clutch when the required torque is determined to be greater than the threshold value, whilst calculating a desired slip amount of the torque converter based on the required torque when the required torque is determined to be not greater than the threshold value and disengaging the lockup clutch such that a slip amount of the torque converter converges to the calculated desired slip amount. |
