A control device of a hybrid vehicle including an engine, a power transmission device, a mechanical oil pump, an electric oil pump, a first rotating machine, and a second rotating machine, the control device comprises: a hybrid control portion; and a pump control portion controlling the first rotating machine to rotate the mechanical oil pump so as to cause the mechanical oil pump to discharge the hydraulic oil when it is determined that the temperature of the hydraulic oil is lower than the predetermined oil temperature, and controlling the motor dedicated to the electric oil pump to cause the electric oil pump to discharge the hydraulic oil when it is determined that the temperature of the hydraulic oil is higher than the predetermined oil temperature, at the time of running in the motor running mode.

A control device of a hybrid vehicle including an engine, a first rotating machine, a power transmission device, a differential mechanism, a lock mechanism, a mechanical oil pump, and an electric oil pump, the control device comprises: a hybrid control portion; a state determining portion; and a flow rate control portion prohibiting the double drive motor running to cause the hybrid vehicle to run in the single drive motor running and controlling the first rotating machine to rotate the mechanical oil pump to cause the mechanical oil pump to discharge the hydraulic oil at the flow rate required for the power transmission device when it is determined that the electric oil pump is in the state of insufficient capacity at the time of running in the motor running mode.

A hybrid vehicle includes a forward-backward travel changeover mechanism including a forward clutch and a reverse brake, a continuously variable transmission, an engine, a motor generator, an output clutch, a mechanical oil pump, an electric oil pump, a manual valve, an oil passage, and a control unit. The manual valve supplies oil to the forward clutch when a parking range is selected. When a state of charge of a high voltage battery decreases to a predetermined value or lower in the parking range, the control unit disengages the output clutch, engages the forward clutch, and causes the engine to operate to drive the motor generator as a generator. When a backward traveling range is selected while power generation is being performed in the parking range, the control unit drives the electric oil pump, and supplies the oil to the output clutch or the reverse brake through the oil passage.

A control device that includes an electronic control unit that is configured to: detect an actual current value flowing through the solenoid valve; receive a current command value and the actual current value detected and generate a primary command voltage value while feeding back the current command value on the basis of the actual current value; calculate a dither command voltage value to cause a periodic voltage oscillation; filter the actual current value detected to remove a frequency corresponding to a period of the dither command voltage value and output the filtered actual current value; generate a secondary command voltage value by superimposing the dither command voltage value generated on the primary command voltage value generated; convert the secondary command voltage value generated into a PWM signal; and generate, on the basis of the PWM signal generated, an application voltage to be applied to the solenoid valve.

A method and system for controlling an engine clutch of a P2 type parallel hybrid vehicle includes steps of: determining whether or not a learning mode entry condition is satisfied, depending on whether or not a kickdown shift occurs during performance of variable hydraulic control of an engine clutch and based on the degree to which slip of the engine clutch occurs, deriving and storing a learning hydraulic value for suppressing the slip that is to occur when the kickdown shift occurs during the performance of the variable hydraulic control in such a manner that the slip does not occur, when a vehicle state satisfies a predetermined learning mode entry condition, and computing a final hydraulic pressure by adding a hydraulic compensation value to a target hydraulic pressure, when the same kickdown shift situation occurs, and controlling the engine clutch using the computed final hydraulic pressure.

In one aspect, a method is provided or braking a work vehicle including an engine and a hydrostatic drive system including a hydraulic pump configured to be rotationally driven by the engine and a hydraulic motor fluidly coupled with the hydraulic pump through a closed hydraulic loop of the hydrostatic drive system. The hydraulic pump may be configured to fluidly drive the hydraulic motor. The method may include receiving an operator request to reduce a ground speed of the work vehicle. The method may include monitoring a fluid temperature of a hydraulic fluid associated with the closed hydraulic loop and automatically controlling at least one of a pump displacement of the hydraulic pump or a motor displacement of the hydraulic motor based on the operator request and the monitored fluid temperature to adjust hydrostatic braking of the work vehicle and thereby reduce the ground speed of the work vehicle.

An apparatus including a transmission mechanism in a power transfer path between a drive source and wheels; an oil pressure control device supplying lubricating oil to the transmission mechanism; and a control part outputting an electrical instruction to increase a flow rate of the supplied lubricating. When the control part outputs an electrical instruction to the oil pressure control device to increase a flow rate of lubricating oil supplied to the transmission mechanism, and determines that the flow rate of lubricating oil supplied to the transmission mechanism from the oil pressure control device does not increase as indicated by the electrical instruction (time t1), the control part considers that the oil pressure control device is in an abnormal state, and can impose a limitation that an absolute value of torque of the transmission mechanism transferred between the wheels and the drive source be reduced (time t1-t5).

A method for operating a drive train of a motor vehicle, the drive train having at least one transmission (2) for carrying out different transmission gear ratios between an input shaft (21) and an output shaft (22) of the transmission (2) by selectively engaging hydraulically actuatable shift elements of the transmission (G), the drive train further having an electric machine as a drive source (1), and a hydraulically actuatable or bridgeable starting component (3) in the power path between the drive source (1) and the output shaft (22). The method includes performing a starting process of the motor vehicle driven solely by the drive source (1) with an engaged or bridged starting component (3). The method further includes limiting a drive source torque (1t) during the starting process to a maximum value dependent on a current system pressure (2p) of a hydraulic system of the transmission (2).

A hybrid system includes a transmission control module, a power source, a transmission, and a drive train. The transmission control module partially operates the hybrid system and receives operating information from various components of the system, calculates power losses in the drive train, and calculates the driving torque needed to reach a target power profile determined from a driver's input.

In a transmission device having a hydraulic control device that releases working oil accumulated in an accumulator and supplies the working oil to a hydraulic servo for starting an engine, the automatic stopping of the engine is permitted when an accumulator internal pressure becomes equal to more than a stopping permission threshold. The stopping permission threshold is changed with a correction value according to a state of the vehicle. Thus, it is possible to optimize the accumulator internal pressure that permits automatic stopping of the engine, to ensure the accumulator internal pressure necessary for starting the engine and the vehicle again and achieve prompt automatic stopping of the engine.