Automatic transmission, control method of automatic transmission, vehicle and control method of vehicle
First Claim
Patent Images
1. An automatic transmission comprising:
- a first transmission mechanism to which a driving force of a driving source is input through a first clutch and which is configured to switch driving force transmission paths to an output member to establish a first set of gear ratios;
a second transmission mechanism to which the driving force of the driving source is input through a second clutch and which is configured to switch driving force transmission paths to the output member to establish a second set of gear ratios; and
a control unit,wherein a one-way clutch is provided in a driving force transmission path that establishes a first certain gear ratio in the first set,the first transmission mechanism comprises;
an input shaft to which the driving force of the driving source is input through the first clutch;
a first transmission gear provided on the input shaft and configured to establish the first certain gear ratio;
a plurality of second transmission gears provided on the input shaft and configured to establish remaining gear ratios in the first set; and
a switching mechanism configured to perform engagement and disengagement between the input shaft and the plurality of second transmission gears,a driving transmission direction of the one-way clutch is set such that a rotation inputted from a wheel side to the output member in a predetermined rotational direction is transmitted to the input shaft, the predetermined rotational direction corresponding to a backward movement of a vehicle, andwhen disengagement by the switching mechanism is impossible, the control unit can execute recovery control to enable the disengagement on condition that a driver performs a predetermined operation.
1 Assignment
0 Petitions
Accused Products
Abstract
A vehicle makes a notification to prompt a driver to perform a predetermined operation in a case in which a predetermined function of the vehicle is lost, and starts a recovery operation of the function on condition that the predetermined operation is performed.
9 Citations
8 Claims
-
1. An automatic transmission comprising:
-
a first transmission mechanism to which a driving force of a driving source is input through a first clutch and which is configured to switch driving force transmission paths to an output member to establish a first set of gear ratios; a second transmission mechanism to which the driving force of the driving source is input through a second clutch and which is configured to switch driving force transmission paths to the output member to establish a second set of gear ratios; and a control unit, wherein a one-way clutch is provided in a driving force transmission path that establishes a first certain gear ratio in the first set, the first transmission mechanism comprises; an input shaft to which the driving force of the driving source is input through the first clutch; a first transmission gear provided on the input shaft and configured to establish the first certain gear ratio; a plurality of second transmission gears provided on the input shaft and configured to establish remaining gear ratios in the first set; and a switching mechanism configured to perform engagement and disengagement between the input shaft and the plurality of second transmission gears, a driving transmission direction of the one-way clutch is set such that a rotation inputted from a wheel side to the output member in a predetermined rotational direction is transmitted to the input shaft, the predetermined rotational direction corresponding to a backward movement of a vehicle, and when disengagement by the switching mechanism is impossible, the control unit can execute recovery control to enable the disengagement on condition that a driver performs a predetermined operation. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A control method of an automatic transmission which comprises:
-
a first transmission mechanism to which a driving force of a driving source is input through a first clutch and which is configured to switch driving force transmission paths to an output member to establish a first set of gear ratios; and a second transmission mechanism to which the driving force of the driving source is input through a second clutch and which is configured to switch driving force transmission paths to the output member to establish a second set of gear ratios, a one-way clutch is provided in the driving force transmission path that establishes a first certain gear ratio in the first set, wherein the first transmission mechanism comprises; an input shaft to which the driving force of the driving source is input through the first clutch; a first transmission gear provided on the input shaft and configured to establish the first certain gear ratio; a plurality of second transmission gears provided on the input shaft and configured to establish remaining gear stages in the first set; and a switching mechanism configured to perform engagement and disengagement between the input shaft and the plurality of second transmission gears, and a driving transmission direction of the one-way clutch is set such that a rotation inputted from a wheel side to the output member in a predetermined rotational direction is transmitted to the input shaft, the predetermined rotational direction corresponding to a backward movement of a vehicle, the control method comprising; determining whether disengagement by the switching mechanism is impossible; and upon determining that the disengagement is impossible, executing recovery control to enable the disengagement on condition that a driver performs a predetermined operation.
-
Specification