摘要:
An automatic transmission hydraulic control system with a first friction engagement element engaged at a first forward gear and establishment of a reverse gear, and a second friction engagement element engaged at least at a second different forward gear including a range pressure output unit outputting a reverse range pressure when a reverse range is selected, a first switching valve having a reverse range pressure input port receiving reverse range pressure, a control pressure input port receiving a control pressure from a linear solenoid valve, and first, second and third output ports. The third output port connected to a hydraulic servo of the second friction engagement element, and switched to a first state in which the reverse range pressure input port and the second output port, the control pressure input port and the third output port are communicated with each other and a second state in which the reverse range pressure input port and the first output port, the control pressure input port and the second output port are communicated with each other. The system also includes a second switching valve having a first input port connected to the first output port, a second input port connected to the second output port, and a fourth output port connected to a hydraulic servo of the first friction engagement element, and switched to a third state in which the second input port and the fourth output port are communicated with each other and a fourth state in which the first input port and the fourth output port are communicated with each other; a first on/off solenoid valve outputting a signal pressure for switching the first switching valve; and a second on/off solenoid valve outputting a signal pressure for switching the second switching valve.
摘要:
A power transfer mechanism control device that controls a power transfer mechanism which is mounted on a vehicle including an automatically stoppable and automatically startable motor and which transfers power from the motor to an axle side via a friction engagement element actuated by a fluid pressure from a fluid pressure actuator, wherein during neutral control performed while the motor is in operation, a neutral control amount, which is a control amount for causing the friction engagement element to stand by in a neutral state with pressure lower than a complete engagement pressure, is set on the basis of a power transfer state of the power transfer mechanism to control the fluid pressure actuator, and learned, and while the motor is automatically stopped, the fluid pressure actuator is controlled using the learned neutral control amount such that the friction engagement element stands by in the neutral state.
摘要:
A power transfer mechanism control device controlling a power transfer mechanism mounted on a vehicle which transfers power from an internal combustion engine to an axle side via a friction engagement element actuated by a fluid pressure from either of a first fluid pressure actuator driven by the power from the internal combustion engine and a second fluid pressure actuator driven by a fluid pressure source different from a fluid pressure source for the first fluid pressure actuator. When the internal combustion engine is to be automatically started, the second fluid pressure actuator is controlled such that, before complete combustion occurs in the internal combustion engine, the friction engagement element stands by in a low-pressure state, and the first fluid pressure actuator is controlled such that the friction engagement element transfers the torque at predetermined timing after the complete combustion occurs in the internal combustion engine.
摘要:
A hydraulic control device used in an automatic transmission includes an oil pump, a working pressure regulating portion, a first lubricant supply passage, a lockup switch mechanism, and a second lubricant supply passage. The oil pump is driven in accordance with rotation of a driving source. The working pressure regulating portion regulates a working pressure based on an oil pressure generated by the oil pump. The first lubricant supply passage supplies a back pressure of the working pressure to a lubricant passage. The lockup switch mechanism turns on/off a lockup clutch of the automatic transmission by switching a supply/discharge path of the working pressure to/from a fluid transmission apparatus of the automatic transmission. The second lubricant supply passage supplies the working pressure to the lubricant passage and is disconnected when a lockup clutch of the automatic transmission is turned on by the lockup switch mechanism.
摘要:
A fluid pressure control device for an automatic transmission that transfers power from a motor via a friction engagement element, including: a first pump actuated by the power from the motor; a pressure regulator that regulates pressure of a working fluid pumped from the first pump; a first flow passage connected to an output port of the pressure regulator; a second flow passage connected to a fluid pressure chamber of the friction engagement element; a switcher that establishes and blocks connection between the first flow passage and the second flow passage; a second pump actuated by supply of electric power and capable of supplying the working fluid to the second flow passage with connection between the first flow passage and the second flow passage blocked by the switcher; and a pressure accumulator that accumulates pressure of the working fluid. The pressure accumulator is connected to the first flow passage.
摘要:
A hydraulic circuit for supplying hydraulic pressure to frictional engagement elements in an automatic transmission including an oil passage connecting an output port through which a drive pressure is output, and a second signal pressure port, of a second clutch application relay valve, and an oil passage connecting an output port through which a modulator pressure is output and the second signal pressure port, are formed in a valve body and arranged such that it is possible to open the oil passage, as well as close the oil passage, with an oil passage closing member. With the hydraulic circuit it is possible to change a formed speed in response to a shift operation when a shift, after being operated from a travel position to a non-travel position, is returned again from the non-travel position, at a time of failure.
摘要:
A pump apparatus configured with a first pump for pumping working fluid in accordance with a reciprocation of a piston using a space between a first open/close valve for suction and a second open/close valve for discharge as a pump chamber. The pump apparatus is also configured a first flow passage for supplying the working fluid from a supply source to an operation subject via the first open/close valve, the pump chamber, and the second open/close valve in accordance with an operation of the first pump. A second flow passage supplies the working fluid pumped by a second pump, which is different from the first pump, to the pump chamber. A selector is configured to select either the first flow passage or the second flow passage.
摘要:
A circulation pressure is supplied to a starting device (2), and a working pressure that engages and disengages a lockup clutch (3) by the difference from the circulation pressure is regulated by a linear solenoid valve (10). A spool portion (121) of the linear solenoid valve (101) is provided with a first feedback oil chamber (12b) for feeding back the working pressure to a spool (12p), and a second feedback oil chamber (12a) for feeding back the circulation pressure to the spool (12p) in the direction opposite to that of the first feedback oil chamber (12p). A pressure-receiving area (A1−A2) of the first feedback oil chamber (12b) and a pressure-receiving area (A1−A2) of the second feedback oil chamber (12a) are set equal to each other in the spool (12p). Thus, an oil pressure acting force of the working pressure of the first feedback oil chamber and that of the circulation pressure of the second feedback oil chamber can be equal to each other, whereby engagement/disengagement control and slip control of the clutch can be accurately performed.
摘要:
An exemplary control device includes an input torque detection unit that detects an input torque input to the input shaft; and a controller that: determines torque distribution of two of the friction engagement elements that form the shift speeds; and calculates a transmission torque of the two friction engagement elements based on the input torque and the torque distribution and sets the engagement pressure to obtain a torque capacity that can transmit the transmission torque, wherein the controller sets the engagement pressure such that slippage does not occur in the two friction engagement elements in a state where engagement of the two friction engagement elements forms the shift speeds and such that, even if an additional friction engagement element engages based on the line pressure while the two friction engagement elements are engaged, one of the three friction engagement elements is caused to slip.
摘要:
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.