Abstract: Provided is a gear change control device of automatic transmission for vehicles. The gear change control device of automatic transmission includes a gear change control part which performs upshift gear change control and downshift gear change control of an automatic transmission according to a shift map. When an operation of a brake operation element is detected and full closure of an accelerator is detected, the gear change control part calculates, based on a change amount of a vehicle speed and a pressure of a brake master cylinder, a determination counter value for determining whether or not to execute the downshift of the automatic transmission, and when the determination counter value is equal to or greater than a threshold value (first threshold value), the gear change control part performs the downshift of the automatic transmission.

Abstract: Provided is a gear change control device of automatic transmission for vehicles. The gear change control device of automatic transmission includes a gear change control part which performs upshift gear change control and downshift gear change control of an automatic transmission according to a shift map. When an operation of a brake operation element is detected and full closure of an accelerator is detected, the gear change control part calculates, based on a change amount of a vehicle speed and a pressure of a brake master cylinder, a determination counter value for determining whether or not to execute the downshift of the automatic transmission, and when the determination counter value is equal to or greater than a threshold value (first threshold value), the gear change control part performs the downshift of the automatic transmission.

Abstract: A dual clutch automatic transmission includes a one-way clutch provided in a driving force transmission path that establishes a certain gear ratio in a first set of gear ratios. A driving transmission direction of the one-way clutch is set such that a rotation inputted from a wheel side to an output member in a predetermined rotational direction is transmitted to the input shaft. The predetermined rotational direction corresponds to a backward movement of a vehicle. On condition that the vehicle has stopped, backward movement prevention control of causing the switching mechanism to engage a transmission gear for another gear ratio in the first set with the input shaft can be executed.

Abstract: A dual clutch automatic transmission includes a one-way clutch provided in a driving force transmission path that establishes a certain gear ratio in a first set of gear ratios. A driving transmission direction of the one-way clutch is set such that a rotation inputted from a wheel side to an output member in a predetermined rotational direction is transmitted to the input shaft. The predetermined rotational direction corresponds to a backward movement of a vehicle. On condition that the vehicle has stopped, backward movement prevention control of causing the switching mechanism to engage a transmission gear for another gear ratio in the first set with the input shaft can be executed.

Abstract: An oil pressure control system of an automatic transmission for a vehicle includes a lock-up clutch, a TC regulator valve, an LC control valve, an LC shift valve, an oil cooler, a control area determination device, a torque transmission capacity calculator, a high load state determination device, and an oil pressure controller. The oil pressure controller is configured to control a TC regulator pressure outputted by a TC regulator valve, so that a torque transmission capacity of a lock-up clutch is greater than a reference torque transmission capacity calculated by the torque transmission capacity calculator, if a control area determined by the control area determination device is a complete engagement area and the high load state determination device determines that an operational state is in a high load state.

Abstract: An oil pressure control system of an automatic transmission for a vehicle includes a lock-up clutch, a TC regulator valve, an LC control valve, an LC shift valve, an oil cooler, a control area determination device, a torque transmission capacity calculator, a high load state determination device, and an oil pressure controller. The oil pressure controller is configured to control a TC regulator pressure outputted by a TC regulator valve, so that a torque transmission capacity of a lock-up clutch is greater than a reference torque transmission capacity calculated by the torque transmission capacity calculator, if a control area determined by the control area determination device is a complete engagement area and the high load state determination device determines that an operational state is in a high load state.