An oil supply system for a vehicle transmission includes a pump drivable by two drive sources, and a hydraulic control unit including multiple control valves for distributing oil to consumers of the oil supply system. The drive power of the two drive sources are combined by a planetary gear set having an element connected to a pump drive shaft of the pump. A method for supplying the consumers of the oil supply system includes determining an overall oil flow requirement in the oil supply system and an oil flow requirement of consumers in an oil supply circuit of the transmission. The method further includes calculating a drive parameter for at least one of the two drive sources based at least in part on the oil flow requirements. Additionally, the method includes outputting the drive parameter as a specified value for controlling the at least one of the two drive sources.

A method of controlling an electric oil pump configured for a vehicle, may include a step of determining whether a vehicle has entered a sloped road, a step of determining whether a drive motor of the vehicle is in one or more overheatable conditions when it is determined that the vehicle has entered a sloped road, a step of determining whether the overheatable condition is maintained over a preset reference time when it is determined that the vehicle is in the over-heatable condition; and a step of supplying a pulse to an RPM input for the electric oil pump when it is determined that the duration of the over-heatable condition exceeds the preset reference time.

A motor vehicle includes a transmission and a transmission fluid pump for transport of transmission oil to and within the transmission. The transmission fluid pump has a moving element which is coupled to a summation shaft of a planetary gear train. The planetary gear train has a ring gear which is operated by a first drive, and a sun gear which is operated by a second drive. A freewheel mechanism is arranged between the sun gear or a shaft connected to the sun gear and a further element so that the second drive can be switched off, when the first drive operates at high speeds while yet maintaining proper operation of the transmission fluid pump.

A hydraulic pressure control method for a transmission includes determining whether a current shift range is among a plurality of shift ranges, setting a dither frequency of a pressure control solenoid valve of a hydraulic circuit for the transmission to a predetermined first frequency when the current shift range is a predetermined first range, and setting the dither frequency of the pressure control solenoid valve to a predetermined second frequency when the current shift range is a shift range other than the first range.

A method of controlling an electric oil pump configured for a vehicle, may include a step of determining whether a vehicle has entered a sloped road, a step of determining whether a drive motor of the vehicle is in one or more overheatable conditions when it is determined that the vehicle has entered a sloped road, a step of determining whether the overheatable condition is maintained over a preset reference time when it is determined that the vehicle is in the over-heatable condition; and a step of supplying a pulse to an RPM input for the electric oil pump when it is determined that the duration of the over-heatable condition exceeds the preset reference time.

An aircraft includes a variable-speed gearbox. The variable-speed gearbox includes a low-speed gear train and a high-speed gear train, each gear train of which is configured to selectively provide torque from an engine of the aircraft to a proprotor. The variable-speed gearbox also includes a hydraulic system configured to provide torque to the proprotor. The hydraulic system includes a hydraulic pump driven by the engine of the tiltrotor aircraft and a variable-displacement motor driven by a hydraulic fluid from the hydraulic pump.

In a coasting control process, an ECU increases line pressure PL of a hydraulic path to predetermined pressure P1 such that discharge pressure of an MOP becomes higher than that before a C1 clutch is disengaged at timing when an executing condition of coasting control is satisfied (time t=t1). According to such coasting control process, driving torque of the MOP increases, so that deceleration (deceleration G) caused by driving of the MOP by a drive wheel becomes larger than that in conventional coasting control in which the discharge pressure of the MOP is not increased. As a result, it is possible to inhibit a driver from feeling discomfort due to free-running feeling generated during the coasting control.

A power-take off (PTO) system for a vehicle having a powertrain comprising an engine and a hybrid electric transmission includes a PTO device configured to provide power to an accessory load of the vehicle, a housing for a gear clutch of the transmission, the housing being formed of steel, needle bearings for the gear clutch, and a gear defined by or attached to an outer surface of the housing, wherein at least one electric motor of the transmission is configured to drive the PTO device via the gear clutch and the gear while the engine is disconnected from the transmission or is shut off.

A method for operating a motor vehicle having a transmission including a hydraulic system with a dual-circuit pump includes driving the dual-circuit pump by both an internal combustion engine and an electric machine via a superposition gear unit that superimposes a rotational speed of the internal combustion engine and a rotational speed of the electric machine. The method further includes determining whether a subset is less than a subset threshold value when a target value of a required primary flow increases in a dual-circuit operating state to a value higher than a current primary flow actual value, with the subset being a difference between the target value and the current primary flow actual value. Additionally, the method includes increasing the second rotational speed of the electric machine when the subset is less than the subset threshold value.

A power transmission device mounted on a vehicle includes: a rotation transmission member that transmits power transmitted from a driving source to an input shaft; a power connection switching mechanism that is connected to or cut off from the driving source and the rotation transmission member; and an oil pump to which rotation of either a first rotational shaft on a driving source side of the power connection switching mechanism and a second rotational shaft on a driving wheel side of the power connection switching mechanism is selectively transmitted to drive the oil pump. The oil pump is coupled to the second rotational shaft via a gear transmission mechanism in which a plurality of gears mesh with each other. A first rotation ratio of the first rotational shaft and the oil pump, and a second rotation ratio of the second rotational shaft and the oil pump are different.