The present invention is configured such that: in a stopped state of an electric oil pump (M/O/P), control of the electric oil pump (M/O/P) is started such that, when a driver has the intention of demanding drive force, a discharge pressure takes on a target hydraulic pressure (P.sub.Th) determined in accordance with the demanded drive force from the driver; and a pressure regulation target value of a line pressure regulation valve (101) is set to a value that is higher than or equal to the target hydraulic pressure (P.sub.Th). Thus, it is possible to provide a vehicular hydraulic control device capable of suppressing hunting in line pressure (PL) when the line pressure (PL) is regulated so as to take on the target hydraulic pressure (P.sub.Th).

A method of controlling an automatic transmission is provided. The automatic transmission includes first and second frictional engageable elements and a hydraulic mechanism. The method includes controlling a first hydraulic pressure control valve of the first element to adjust hydraulic pressure to a given value in a first period in response to the gear shift command and increase the hydraulic pressure until first friction plates engaged in a second period, and a second hydraulic pressure control valve of the second element to pre-charge in response to the gear shift command, maintain the hydraulic pressure at a lower value than a highest target value immediately after the pre-charging, and increase the hydraulic pressure until second friction plates engaged immediately after the maintaining the pressure, a time length of the first period being shorter than a time length between a start of the pre-charging and a start of the increasing the pressure.

A transmission device is provided with a hydraulic control device, which has a pump for generating hydraulic pressure using power from a motor, and an accumulator, and which controls hydraulic pressure and supplies the hydraulic pressure to a hydraulic servo of an engagement element. The transmission device executes, when the motor that automatically stopped starts up with a request for vehicle travel: a fill control in which the hydraulic control device is controlled so that the hydraulic servo is being filled with working oil; a standby control to control the hydraulic pressure in the hydraulic servo at a standby pressure; and an engagement control to increase the hydraulic pressure in the hydraulic servo is started when the rotational speed of the motor becomes reaches or exceeds a prescribed rotational speed, after hydraulic pressure accumulated in the accumulator is released into the hydraulic circuit, so that the engagement element is engaged.

A control apparatus for a vehicle provided with a step-variable transmission including a one-way clutch to be placed in an engaged state to establish a predetermined one of gear positions of the step-variable transmission, and a coupling device disposed parallel with the one-way clutch, includes a control portion configured to control a shift-up action of the step-variable transmission from the above-indicated predetermined one gear position in which the coupling device is placed in its engaged state, the control portion controlling the shift-up action so as to delay a releasing action of the coupling device where a required torque of the vehicle prior to a moment of initiation of an inertia phase of the shift-up action is larger than a predetermined value, with respect to the releasing action where the required torque is not larger than the predetermined value.

Provided is a hydraulic oil control device having a shifting control unit configured to, in a case where, when upshifting is performed, a number of revolutions of an input shaft connected to a to-be-engaged clutch is higher than a number of revolutions of the engine, or a case where, when downshifting is performed, the number of revolutions of the input shaft is lower than the number of revolutions of the engine, supply the to-be-engaged clutch with a hydraulic oil having a pressure equal to or higher than a predetermined standby pressure, and then to supply the to-be-engaged clutch with the hydraulic oil having the standby pressure, and then configured to cause the to-be-engaged clutch to be engaged by supplying the to-be-engaged clutch with the hydraulic oil having a pressure higher than the standby pressure.

A vehicle includes a power source, a transmission coupled to the power source, and a control unit. The transmission includes a torque converter and a hydraulic switching mechanism. A processor of the control unit is configured to execute in accordance with an instruction stored in a storage medium: obtaining RPM of a turbine shaft of the torque converter based on a unit time when the transmission is switched from neutral to forward driving or to reverse driving; determining whether the RPM is decreased by an amount greater than a predetermined amount of decrease based on the unit time; and reducing, if the RPM is decreased by an amount greater than the predetermined amount of decrease based on the unit time, pressure of oil to be supplied to an oil chamber of the hydraulic switching mechanism when the transmission switches to the same mode as the previously switched mode next time.

A method for CVT low oil pressure input clutch fill compensation includesperforming a garage shift when a modeled fill pressure is equal to a commanded modeled fill pressure. Then the line pressure is checked to determine if it is less than the commanded fill pressure when performing the garage shift. If so, then the modeled fill pressure is set to the line pressure and the primary and secondary actual pulley pressures are read by sensing devices. Next, the primary and secondary commanded pulley pressures are checked to determine if they are greater than the modeled fill pressure. If so, then a first dPressure value for the flow rate model based on the lowest of the modeled fill pressure, the primary actual pulley pressure, or the secondary actual pulley pressure is determined and it is used to compensate the flow rate model.

A method for controlling a hydraulically actuated shift element of a vehicle transmission (G) includes determining a fill level of a pressure compensating cavity (2) associated with a pressure chamber (1) and controlling pressurizing of the pressure chamber (1) with hydraulic fluid based at least in part on the determined fill level of the pressure compensating cavity (2). The pressure chamber (1) is fillable with the hydraulic fluid by an electronically controlled hydraulic system in order to actuate the shift element.

A hydraulic control device for an automatic transmission including a valve device. The valve device comprising a switching valve, featuring a switching component and a check valve. The switching valve is formed in a housing and is hydraulically connected to a first pressure adjusting device and a second pressure adjusting device along with a shift element for transferring a certain torque. The switching valve is formed as a directional seat valve.

A method for operating a drivetrain of a motor vehicle includes elevating a system pressure acting on a plurality of shift elements (A, B, C, D, E, F) when one of at least one positively locking shift element (A, F) is closed in a force-locking-free state, increasing a torque output by a drive assembly (15) and then subsequently reducing the torque output by the drive assembly (15) while the system pressure is elevated by an intervention with the drive assembly (15), and reducing the system pressure after reducing the torque output by the drive assembly (15). The one of the at least one positively locking shift element (A, F) closed in the force-locking-free state or another one of the at least one positively locking shift element (A, F) is opened while the system pressure is elevated and the torque output by the drive assembly (15) changes.