Aisin Aw Co., Ltd.

Tomoya Jinno

Kazunori Ishikawa

Tetsuya Shimizu

Kenichi Tsuchida

Masamichi Yamaguchi

Tomomi Ishikawa

Akitomo Suzuki

Satoshi Nishio

Munehiro Tashiro

A hydraulic control device that controls a hydraulic pressure for a plurality of friction engagement elements included in an automatic transmission mounted on a vehicle to establish a plurality of shift speeds, including: a plurality of pressure regulation valves, a plurality of hydraulic switches, speed change control means, and abnormality determination means.

Hydraulic control device and abnormality determination method for the same

A hydraulic control device includes a lock-up control valve that regulates a line pressure to generate a control pressure, and a lock-up relay valve that switches between paths through which a hydraulic pressure is supplied to and discharged from a torque converter. The lock-up relay valve is formed to be capable of switching between a path that connects between a control pressure oil passage to which the control pressure is output and a lock-up oil passage communicated with a lock-up oil chamber and that connects between a control pressure oil passage to which the control pressure is output and a circulation input oil passage communicated with a converter oil chamber, and a path that blocks connection between the control pressure oil passage and the lock-up oil passage and that blocks connection between the control pressure oil passage and the circulation input oil passage.

Hydraulic control device

A power transmission device that transmits power from a motor to a wheel via a hydraulically driven friction engagement element and that includes a mechanical pump driven by the motor to produce a hydraulic pressure that is regulated by a pressure regulating valve; an electric pump that produces a hydraulic pressure; a switching mechanism that either switches an output pressure of the regulating valve or an output pressure of the electric pump to a servo of the engagement element based upon a signal pressure; a passage to supply pressure from the mechanical pump to the hydraulic servo; a check valve in the passage that allows supply of the pressure from the mechanical pump to the hydraulic servo and prohibits supply of the pressure from the electric pump to the mechanical pump, and the switching mechanism either shuts off or allows communication through the passage based upon the signal pressure.

Power transmission device

A hydraulic pressure control device including a pump driven to generate hydraulic pressure; a first pressure regulation valve that regulates hydraulic pressure in a first passage coupled to a pump along with discharge of oil; a second pressure regulation valve that receives the hydraulic pressure in the first passage and regulates the hydraulic pressure to an engagement pressure to engage a lock-up clutch according to a first signal pressure to output the engagement pressure to a second passage that supplies the oil to an engagement chamber; and a third pressure regulation valve that receives the hydraulic pressure in the first passage or the engagement pressure output to the second passage and regulates the received pressure according to the first signal pressure or a second signal pressure that synchronizes with the first signal pressure to output the resulting pressure to a third passage that supplies the oil to the disengagement chamber.

Hydraulic pressure control device

A power transmission device that transmits power from a motor to a wheel via a hydraulically driven friction engagement element and that includes a mechanical pump driven by the motor to produce a hydraulic pressure that is regulated by a pressure regulating valve; an electric pump that produces a hydraulic pressure; a switching mechanism that either switches an output pressure of the regulating valve or an output pressure of the electric pump to a servo of the engagement element based upon a signal pressure, and a drain valve that opens to drain oil when a hydraulic pressure of a preset pressure or more is applied, and the switching mechanism connects to the drain valve to allow communication between the electric pump and the drain valve in the first state, and shut off communication between the electric pump and the drain valve.

A hydraulic pressure controller, which controls hydraulic pressure supplied to a torque converter including a lock-up clutch that is engageable using a hydraulic pressure from a mechanical pump, including a first pressure regulation valve that regulates pressure in a first passage connected to the pump while discharging oil in the first passage to a discharge passage; a bypass passage branched from the first passage bypassing the first pressure regulation valve; a first switching valve selectively switchable between a first state in which the bypass passage and a second passage are connected to each other and a second state in which the discharge passage and the second passage are connected to each other; and a second pressure regulation valve that regulates a hydraulic pressure in the second passage. The first switching valve is switchable into the first state to engage the clutch and into the second state to disengage the clutch.

A fluid pressure control device including a first pump actuated by power from a motor; a pressure regulator that regulates a discharge pressure from the first pump; a second pump actuated by electric power; a switcher opening a first path extending from the pressure regulator to a fluid pressure chamber of a friction engagement element, and blocking a second path extending from the second pump to the fluid pressure chamber of the friction engagement element, when the signal pressure is equal to or more than a set pressure, and the switcher blocking the first and opening the second paths when the signal pressure is less than the set pressure; and a control that controls the second pump and the fluid supply unit to supply the fluid regulated by the pressure regulator to a destination different from the fluid pressure chamber of the friction engagement element when the motor is stopped.

Fluid pressure control device for automatic transmission

A valve assembly includes a plurality of solenoid valves, each solenoid valve having a pressure-regulating valve portion formed by a sleeve having a plurality of valve-side ports and a spool for opening and closing the valve-side ports, and a solenoid portion having a plunger for driving the spool and a coil for electromagnetically driving the plunger; and a valve body having a plurality of insertion holes into which the solenoid valves are inserted, and having ports that are connected to the plurality of valve-side ports in a state in which the solenoid valves are mounted.

Growing community of inventors

Nishio, Japan

Tomoya Jinno