Abstract: A controller for a hybrid system is provided. A clutch is disposed between a crankshaft and a drive shaft of an electric motor. An engine-side rotating body rotates integrally with the crankshaft. A motor-side rotating body rotates integrally with the drive shaft. The controller performs balance control. In the balance control, the controller causes the engine-side rotating body and the motor-side rotating body to rotate relative to each other by bringing the clutch into the slipping state. Thereafter, the controller switches the clutch to the engaged state such that the position of the center of gravity of the engine-side rotating body and the position of the center of gravity of the motor-side rotating body are farther from each other in the circumferential direction than before bringing the clutch into the slipping state.

Abstract: A controller for a hybrid system is provided. A clutch is disposed between a crankshaft and a drive shaft of an electric motor. An engine-side rotating body rotates integrally with the crankshaft. A motor-side rotating body rotates integrally with the drive shaft. The controller performs balance control. In the balance control, the controller causes the engine-side rotating body and the motor-side rotating body to rotate relative to each other by bringing the clutch into the slipping state. Thereafter, the controller switches the clutch to the engaged state such that the position of the center of gravity of the engine-side rotating body and the position of the center of gravity of the motor-side rotating body are farther from each other in the circumferential direction than before bringing the clutch into the slipping state.

Abstract: A hybrid vehicle is provided. In the hybrid vehicle an oil pump can be driven while stopping an engine without a device for interrupting torque transmission between a power split device and the engine. A differential mechanism includes a first rotary element to which torque is delivered from the engine, a second rotary element connected to drive wheels, and a third rotary element to which torque is delivered from the first motor. Torque transmission between the first motor and the third rotary element is interrupted by a clutch. A mechanical oil pump is driven by any one of the first input shaft and the second input shaft that is rotated higher than the other one.

Abstract: A hybrid vehicle is provided. In the hybrid vehicle an oil pump can be driven while stopping an engine without a device for interrupting torque transmission between a power split device and the engine. A differential mechanism includes a first rotary element to which torque is delivered from the engine, a second rotary element connected to drive wheels, and a third rotary element to which torque is delivered from the first motor. Torque transmission between the first motor and the third rotary element is interrupted by a clutch. A mechanical oil pump is driven by any one of the first input shaft and the second input shaft that is rotated higher than the other one.

Abstract: In a seal device for a hydraulic circuit, in which an oil passage that supplies hydraulic oil to or discharges the hydraulic oil from a hydraulic actuator operated by hydraulic pressure is formed over at least two members that relatively move, and a seal member that seals a gap between the two members in a liquid-tight manner is disposed in an interior of a groove section that is formed in at least either one of the two members, a communication section that allows the groove section to communicate with any portion of the oil passage such that the hydraulic oil in the interior of the groove section moves along with supply of the hydraulic oil to or discharge of the hydraulic oil from the hydraulic actuator is formed.

Abstract: A hydraulic control unit configured to improve energy efficiency is provided. The hydraulic control unit is comprised of: a feeding passage that delivers fluid from at least any of an oil pump and an accumulator storing hydraulic pressure to an actuator; a draining passage that discharge the fluid from the actuator to a drain spot; and a discharging means that is configured to selectively discharge the fluid from the actuator to the accumulator through the feeding passage, if the fluid has to be discharged from the actuator and a pressure of the accumulator is lower than that of the actuator.

Abstract: A control system for a hybrid vehicle is provided to suppress noise generated by an application of excessive torque to a torsional damper. A controller predicts that a limit torque is applied to the input member. If an application of the limit torque to the input member is expected, the controller restricts an output torque of an engine while adjusting an output torque of the motor to compensate a reduction in a drive force resulting from a restriction of the engine torque.

Abstract: A hydraulic control unit is provided. A valve is comprised of a piston having a valve element, a cylinder holding the piston while allowing to reciprocate axially, a positive pressure chamber formed on one side of the piston to which pressure to open the valve is applied, a back pressure chamber formed on the other side of the piston to which the pressure to close the valve is applied, and a connection passage for differentiating pressures in the positive pressure chamber and the back pressure chamber. A pilot valve selectively connects the back pressure chamber with a site where the pressure is lower than that of the back pressure chamber. Hydraulic pressure lower than that applied to positive pressure chamber is applied to a low pressure section.

Abstract: A hydraulic circuit and a hydraulic control system for preventing fluid leakage and power loss resulting from jamming of contaminants. A first circuit section has an accumulator for storing hydraulic pressure, and a control valve for controlling a passage for delivering fluid from the accumulator to an actuator. Fluid discharged from an oil pump is delivered continuously to a second circuit section. A first filter is disposed on a passage for delivering the fluid from the oil pump to the accumulator for the purpose of removing contaminants finer than those in the fluid to be delivered to the second circuit section from the fluid to be delivered to the accumulator.

Abstract: A hydraulic pressure control device for a transmission, which operates a hydraulic apparatus by hydraulic pressure generated by an pump driven during operation of a driving force source, for which automatic stop control is performed, accumulates the hydraulic pressure in a pressure accumulator, and supplies the hydraulic pressure accumulated in the pressure accumulator to the hydraulic apparatus when the driving force source is automatically stopped is provided. The automatic stop control includes control to stop the driving force source when the vehicle speed is equal to or higher than a prescribed vehicle speed; and the hydraulic pressure control device performs a control to control an accumulated oil amount in the pressure accumulator and the automatic stop control in a manner to increase the accumulated oil amount of the pressure accumulator when the driving force source is automatically stopped.

Abstract: A switch valve which is configured such that a plurality of land sections and a valley section between the land sections are formed in a valve element that advances or retreats in an axial direction according to a manual operation, a plurality of port sections opened are provided in a cylinder section in which the valve element is inserted so as to be capable of advancing and retreating, and the prescribed port sections are made to communicate with each other via the valley section according to a position of the valve element in the axial direction or be blocked by the land section, the switch valve includes a seal section that seals a space between portions on both sides in the axial direction across either one of the land sections in a liquid-tight manner.

Abstract: A hydraulic control system comprises: a regulator valve, which regulates a fluid pressure established by an oil pump to an operating pressure required in a control circuit; a signal pressure establishing valve, which applies a signal pressure to the regulator valve to determine a level of the fluid pressure to be established by the regulator valve; and an accumulator, which accumulates the operating pressure to be applied to the control circuit.

Abstract: A hydraulic control unit configured to improve energy efficiency is provided. The hydraulic control unit is comprised of: a feeding passage that delivers fluid from at least any of an oil pump and an accumulator storing hydraulic pressure to an actuator; a draining passage that discharge the fluid from the actuator to a drain spot; and a discharging means that is configured to selectively discharge the fluid from the actuator to the accumulator through the feeding passage, if the fluid has to be discharged from the actuator and a pressure of the accumulator is lower than that of the actuator.

Abstract: A hydraulic control unit is provided. A valve is comprised of a piston having a valve element, a cylinder holding the piston while allowing to reciprocate axially, a positive pressure chamber formed on one side of the piston to which pressure to open the valve is applied, a back pressure chamber formed on the other side of the piston to which the pressure to close the valve is applied, and a connection passage for differentiating pressures in the positive pressure chamber and the back pressure chamber. A pilot valve selectively connects the back pressure chamber with a site where the pressure is lower than that of the back pressure chamber. Hydraulic pressure lower than that applied to positive pressure chamber is applied to a low pressure section.

Abstract: A hydraulic control system for an automatic transmission, in which a belt is applied to at least one pair of pulleys, and in which widths of belt grooves of the pulleys, or pressures to clamp the belt by the pulleys are controlled by hydraulic pressures applied to hydraulic chambers of the pulleys. The hydraulic control system is comprised of: a control valve that controls a delivery and a drainage of hydraulic fluid to/from the hydraulic chamber; and a drive frequency setting means that determines a drive frequency of a drive signal for actuating the control valves in such a manner that a phase of a local maximum value of amplitude of the drive signal is shifted from a phase of a local maximum value of amplitude of vibrations resulting from rotating the pulleys.

Abstract: A sealing structure capable of reducing oil leakage while preventing the oil from being deteriorated by a temperature rise of the oil. The sealing structure is configured to seal a clearance between two members tightly by a seal ring interposed therebetween. The seal ring is provided with a slidable structure, which is configured to seal the clearance between the two members by a hydraulic pressure applied thereto, and to unseal the clearance between the two members by a relative movement thereof resulting from a thermal expansion thereof.

Abstract: A hydraulic control system for an automatic transmission. The hydraulic control system is applied to an automatic transmission adapted to vary a torque capacity of a transmission member by an actuator. The hydraulic control system includes: a discharging device configured to discharge compressible gas entrained in the hydraulic fluid in the actuator; an interrupting device that interrupts power transmission; and a controller configured to determine an entrainment of the compressible gas in the hydraulic fluid, disconnect the power transmission via the interrupting device in a case that an entrained compressible gas is determined, and cause the entrained compressible gas to be removed from the hydraulic fluid by rotating the actuator while interrupting the power transmission.

Abstract: A hydraulic pressure control device for a transmission, the hydraulic pressure control device configured to operate a prescribed hydraulic apparatus by hydraulic pressure generated by an oil pump to be driven during operation of a driving force source, for which automatic stop control is performed according to at least one of a vehicle speed and a request drive amount, to accumulate the hydraulic pressure in a pressure accumulator, and to supply the hydraulic pressure accumulated in the pressure accumulator to the hydraulic apparatus when the driving force source is automatically stopped, wherein: the automatic stop control includes control to stop the driving force source during travel in which the vehicle speed is equal to or higher than a prescribed vehicle speed; and the hydraulic pressure control device is configured to perform a pressure accumulation control to control an accumulated oil amount in the pressure accumulator and the automatic stop control in a cooperative manner so as to increase the accum

Abstract: In a seal device for a hydraulic circuit, in which an oil passage that supplies hydraulic oil to or discharges the hydraulic oil from a hydraulic actuator operated by hydraulic pressure is formed over at least two members that relatively move, and a seal member that seals a gap between the two members in a liquid-tight manner is disposed in an interior of a groove section that is formed in at least either one of the two members, a communication section that allows the groove section to communicate with any portion of the oil passage such that the hydraulic oil in the interior of the groove section moves along with supply of the hydraulic oil to or discharge of the hydraulic oil from the hydraulic actuator is formed.

Abstract: A switch valve which is configured such that a plurality of land sections and a valley section between the land sections are formed in a valve element that advances or retreats in an axial direction according to a manual operation, a plurality of port sections opened are provided in a cylinder section in which the valve element is inserted so as to be capable of advancing and retreating, and the prescribed port sections are made to communicate with each other via the valley section according to a position of the valve element in the axial direction or be blocked by the land section, the switch valve includes a seal section that seals a space between portions on both sides in the axial direction across either one of the land sections in a liquid-tight manner.