Abstract: An oil pump driving control device of a vehicle having a main oil pump (14) that is driven by a motor/generator (4) and produces a pump discharge oil to a first clutch (3), a second clutch (5) and a belt-type continuously variable transmission (6) provided on a driving force transmission line. A hybrid control module (81) is provided in this FF hybrid vehicle. The hybrid control module (81) is configured to perform a control so that during vehicle stop, the lower an ATF oil temperature is, the more the pump driving energy to drive the main oil pump (14) is decreased. With this control, consumption energy during the vehicle stop can be reduced.

Abstract: A method for reducing noise generated from an electric oil pump (EOP) is reduced while driving a vehicle which has only the EOP without a mechanical oil pump (MOP) limits revolutions per minute (RPM) of the EOP to 70% or less of a maximum RPM during a low noise driving mode and rotates the EOP at the maximum RPM during a high noise driving mode.

Abstract: Noise may be prevented from being generated while providing smooth shift operability by preventing the overshoot phenomenon in which rpm of the electric oil pump is unexpectedly increased as the load decreases at the time when shifting ends in controlling the rpm of the electric oil pump to increase in order to increase the line pressure of the transmission as the shifting operation from step N to step D is performed in the hybrid vehicle having the electric oil pump.

Abstract: A hydraulic pressure control apparatus for an automatic transmission may include a first hydraulic pump connected with an oil tank to receive oil from the oil tank, having a first motor, and adapted to generate a low pressure through an operation of the first motor, a second hydraulic pump connected with the first hydraulic pump to receive the low pressure, having a second motor, and adapted to generate a high pressure through an operation of the second motor, a first regulating valve adapted to receive the low pressure from the first hydraulic pump and to regulate a first operating pressure to supply to the torque converter, and a second regulating valve adapted to receive the high pressure from the second hydraulic pump and to regulate a second operating pressure to supply to the powertrain.

Abstract: A method for operating a hydraulic system of an automatic transmission, in particular in a hybrid drivetrain, in which the hydraulic system comprises a main pump that is powered by an internal combustion engine and/or an electric drive motor, an electric auxiliary pump and a system pressure valve for setting a system pressure, to ensure various operating functions. In addition to the main pump, the electric auxiliary pump also supplies the hydraulic system with a volume flow of an operating medium. The loading of the electric auxiliary pump is determined in an electronic control unit with regard to the value of the system pressure and the loading of the electric auxiliary pump is limited, by the electronic control unit, with regard to the selected operating function.

Abstract: A method and apparatus to monitor operation of an electrically-actuated hydraulic pump selectively operative to supply pressurized fluid to a hydraulic circuit for a transmission device operably connected to an internal combustion engine of a vehicle includes monitoring vehicle operation and passively and intrusively monitoring hydraulic circuit pressure. The hydraulic pump is functioning properly when the monitored pressure in the hydraulic circuit exceeds a threshold. A fault related to the hydraulic circuit is identified when the monitored pressure in the hydraulic circuit does not exceed the threshold.

Abstract: A control device for a vehicle controls a motor-driven pump at an appropriate timing when an internal combustion engine is stopped or starts. An ECU of the control device comprises an operation determination section which determines whether or not the motor-driven pump is operated depending on the value of an idling stop flag that makes the internal combustion engine stop, depending on a measured value output from an oil pressure sensor for measuring oil pressure in oil lines providing operation oil to a torque converter and a transmission, and depending on a measured value output from an oil temperature sensor for measuring the temperature of the operation oil; and a target electrical current calculation section for calculating a target value of electrical current to be supplied during the operation of the motor-driven oil pump depending on the determination result by the operation determination section.

Abstract: In a constitution where a hydraulic pressure is delivered periodically to friction engagement elements in released states to discharge air mixed into a hydraulic circuit a duty ratio in the hydraulic pressure delivery is switched to a plurality of different values according to operating conditions, a ratio of an actual total time to a target total time is switched per each of duty ratios; and the air discharge control is terminated when a sum of the ratios becomes a predetermined value or above.

Abstract: A condition for driving an electric oil pump is set. A turbine speed or an input speed of an automatic transmission is measured. A correction amount for a hydraulic pressure is calculated on the basis of the turbine speed obtained by reference to a relation between the turbine speed and hydraulic pressure, and a correction amount for a drive duty ratio of the electric oil pump which is required for generation of the corrected hydraulic pressure is calculated. The procedure is resumed after the procedure has been performed. The condition for driving the electric oil pump is updated on the basis of the correction amount for the drive duty ratio calculated.

Abstract: An engine and a motor are connected to the drive wheels of a vehicle via an automatic transmission. The drive wheels are driven using one of or both of the motor and the engine depending on the running state. The automatic transmission varies the drive ratio by the discharge pressure of the oil pressure pump. The oil pressure pump is driven by a second motor. When the automatic transmission is varying the drive ratio, the discharge of the oil pressure pump is increased by increasing the rotational speed of the second motor and thus the required oil for varying the drive ratio is maintained.

Abstract: A first pump (21) which supplies a required flow amount for speed ratio control and a second pump (22) which supplies a flow amount which is re-cycled to an oil cooler in order to cool the oil are driven at the same time by a common motor (23). A required discharge amount for the first pump (21) is calculated depending on driving conditions and a required discharge amount for the second pump (22) is calculated depending on driving conditions. The motor (23) is controlled to a rotation speed so that a discharge amount is produced which satisfies the larger of the two required pump discharge amounts calculated above. In such a way, pump rotation speeds are controlled so that the required discharge amount is produced depending on driving conditions which enables reductions in electricity consumption and noise.

Abstract: A speed ratio control operation of an automatic transmission for a vehicle is controlled by using an oil pressure supplied from a oil pump (16). At least a circuit (22) which sets a rotation speed of the oil pump (16) to a first pump rotation speed in order to maintain a necessary minimum line pressure to control a variable mechanism, a stationary vehicle condition determination circuit (24) which determines that the vehicle is operating under the conditions that the brake is operated and vehicle speed is below a fixed value, and a circuit (23) which sets a second pump rotation speed which is lower than the first pump rotation speed when stationary vehicle conditions are met are provided. The rotation speed is lowered to the second pump rotation speed when the vehicle stationary conditions are met which results in reduced energy consumption and reduced noise pollution.

Abstract: When the pressure of a discharge fluid of an electric pump (1) exceeds a predetermined relief pressure, relief valve (6) discharges a part of the fluid to a drain passage (5). A sensor (8, 10, 11) detects a drain flowrate of the drain passage (5), and feedback control of the rotation speed of the electric pump (1) is performed so that the drain flowrate coincides with a predetermined flowrate. Due to this feedback control, the necessary fluid pressure is maintained while suppressing the drain flowrate to the minimum.

Abstract: In an automatic transmission, the amount of transmission fluid discharged is controlled by a flow control valve. A fixed displacement type pump is connected with a bypass passage through which a part of fluid discharged from a discharge port of the pump flows back to a suction port of the pump. A flow control valve is provided in the bypass passage so as to regulate the amount of discharged fluid at an approximate equal level according to a feedback pressure generated in a pressure regulating valve.