Abstract: A mechanical engagement mechanism has regulation states out of a first state in which at least one of a plurality of rotating elements is rotatable only in a first direction and a second state in which the at least one of the plurality of rotating elements is not rotatable in both of the first direction and a second direction opposite to the first direction and a reverse gear position is to be established. A non-traveling gear position is to be established in the first state or in the second state. A processor is to switch the regulation states of the mechanical engagement mechanism from the second state to the first state when oil pressure that is detected by an oil pressure sensor becomes lower than a predetermined oil pressure after switching a shift position from the reverse gear position to the non-traveling gear position is detected.

Abstract: One solenoid valve included in a hydraulic pressure control device has at least two functions among the following (1) to (6) functions, (1) switching a state of a two-way clutch, (2) switching a state of a parking lock mechanism, (3) switching the supply of hydraulic pressure to a first brake that is put into an engaged state when a gear stage selected when driving of a vehicle starts is set, (4) controlling a line pressure adjustment valve so that a decrease in a line pressure is prevented when the temperature of a hydraulic fluid is a first predetermined temperature or higher, (5) preventing the occurrence of a creep phenomenon in a neutral range when the temperature of the hydraulic fluid is a second predetermined temperature or lower, and (6) boosting a line pressure by performing switching to another linear solenoid valve when the line pressure adjustment valve has failed.

Abstract: There is provided a transmission control device capable to switching a switching mechanism quickly. A transmission control device ECU controls an automatic transmission (3) and can receive information about a slope from a front and rear G sensor. The automatic transmission (3) includes a two-way clutch (F1) as a switching mechanism that is switchable between a reverse rotation prevention state in which forward rotation of a rotatable carrier (Cb) (eleventh element) is allowed and reverse rotation is prevented and a fixed state in which rotation of the element is prevented. When the range is switched to a parking range and a vehicle is not stopped on a slope, the transmission control device ECU switches the two-way clutch (F1) to the fixed state.

Abstract: A control apparatus of an automatic transmission connected to an internal combustion engine of a vehicle includes a determination unit configured to determine an operation state of a hydraulic oil temperature sensor based on comparison between a threshold and a difference between a hydraulic oil temperature of the automatic transmission and a cooling water temperature of the internal combustion engine. When the operation state of the hydraulic oil temperature sensor is determined as normal by the comparison with the threshold, the determination unit further determines the operation state of the hydraulic oil temperature sensor based on an operation state of an oil pressure sensor determined using the hydraulic oil temperature, an oil pressure of hydraulic oil, and a rotation speed.

Abstract: A control apparatus of an automatic transmission, which includes a mechanical engaging mechanism functioning as a brake, includes a determination unit determining, when a selected gear is a lowest forward speed gear, and the mechanism is in a second state, whether to switch the mechanism to the first state, and a switching processing unit switching the mechanism to the first state based on a determination result. In the first state, only rotation of a predetermined rotational element provided in planetary gear mechanisms in a first direction is restricted. In the second state, rotation of the predetermined rotational element in both the first and second direction is restricted. The determination unit determines to switch the mechanism to the first state at least on condition that a driving force is larger than a predetermined driving force.

Abstract: Provided is a hydraulic pressure control device. A hydraulic pressure control device includes a solenoid valve configured to supply hydraulic pressure to switch between an engaged state and a released state of a lock-up clutch, and a transmission control device configured to control the solenoid valve. The solenoid valve supplies hydraulic pressure to switch between a parking locked state and a parking released state of a parking lock mechanism, in addition to switching of the lock-up clutch.

Abstract: There is provided an automatic transmission capable of preventing deterioration of driving performance even when an engagement mechanism is not switched due to a failure. An automatic transmission includes a first brake which is always in a fixed state from a first forward gear stage to a predetermined gear stage and is in an open state at a gear stage with a higher speed than the predetermined gear stage, and a hydraulic sensor configured to detect whether the first brake is switched to the fixed state. When a transmission control device instructs the first brake to switch to the fixed state, and it is confirmed that the first brake is in an open state, the transmission control device instructs engagement mechanisms other than the first brake to perform switching so that a preliminary gear stage is able to be set.

Abstract: Provided is an automatic transmission capable of smoothly switching a switching mechanism. A control part ECU of a transmission recognizes an input torque and a friction torque when an instruction to switch a two-way clutch from a fixed state to a reverse rotation prevention state is received while a first clutch, a second clutch and a third clutch are in an open state, and switches the two-way clutch from the fixed state to the reverse rotation prevention state when the input torque is equal to or greater than the friction torque.

Abstract: Provided is a hydraulic pressure control device. A hydraulic pressure control device supplies hydraulic pressure to a piston using solenoid valves and performs 2:1 switching processing of stopping the supply of hydraulic pressure to the piston using a solenoid valve when the piston is switched to a parking locked state. When the piston is not switched to a side that is to be a parking locked state, hydraulic pressure is supplied to two solenoid valves, and 2:0 switching processing of stopping the supply of hydraulic pressure to the piston by solenoid valves is performed. Then, a reporting processing of reporting that at least one of the solenoid valves has failed is performed.

Abstract: A control apparatus for a vehicle automatic transmission includes a downshift determining unit that determines whether downshift of a gear shift stage is to be performed based on at least one of a history of lateral accelerations and a history of variations of a vehicle speed. A lateral acceleration history acquiring unit or a vehicle speed variation history acquiring unit returns at least one of the history of the lateral accelerations and the history of the variations of the vehicle speed to an initial value when a shift control mode determined by a shift control mode determining unit is switched. At least one of the initial value of the history of the lateral accelerations and the initial value of the history of the variations of the vehicle speed is a value that is set for each shift control mode determined by the shift control mode determining unit.

Abstract: There is provided an automatic transmission capable to preventing an output of a driving source in a neutral range from being transmitted to wheels without increasing the number of control valves which could fail. An automatic transmission includes a first brake, a third clutch, a third brake, a transmission control device configured to control the first brake, the third clutch, and the third brake, and a hydraulic sensor and a hydraulic switch configured to determine whether the first brake is under control of the transmission control device. When the hydraulic sensor and the hydraulic switch detect that the first brake is in an engaged state contrary to control of the transmission control device in a non-traveling range, the transmission control device switches the third clutch and the third brake to the engaged state.

Abstract: A power transmission includes a first brake, a pressure regulating valve, an accumulator, an oil temperature sensor, a second electromagnetic valve allowing supply of working oil to a piston, and a power transmission control device. The power transmission control device includes a memory relating and storing a working oil temperature and a permission time configured to allow release of the accumulator, and a receiver unit receiving a starting request. The accumulator is connected such that the working oil, in which the pressure is accumulated, can be supplied to the first brake and the piston. The power transmission control device sets a permission time corresponding to a temperature of the working oil on the basis of the memory. The working oil, in which the pressure is accumulated, is supplied to the first brake only during the permission time when restart information is received, while a vehicle performs idling stop control.

Abstract: A vehicle parking lock device includes an automatic transmission to transmit a drive force from a drive source. The automatic transmission includes a hydraulic actuator and a hydraulic circuit. The hydraulic actuator restricts rotation of a parking gear. The hydraulic circuit includes an accumulator and a line pressure controller. Pressure is accumulated in the accumulator with line pressure. Hydraulic pressure accumulated in the accumulator is supplied to the hydraulic actuator so that the hydraulic actuator is in a parking lock activation position when the drive source has stopped. Pressure in the accumulator is accumulated with the line pressure when the drive source has started. The line pressure controller boosts the line pressure to a level higher than or equal to a pressure necessary to fully fill up the accumulator in a case where a predetermined condition is satisfied after the drive source has started.

Abstract: A control apparatus for an automatic transmission including a torque converter with a lock-up clutch capable of connecting the output shaft of an engine and the input shaft of the automatic transmission includes a state determination unit configured to determine, based on an operation signal from an ABS device, whether the ABS device of a vehicle is in a normally operating state or in a fail state, a rotation speed determination unit configured to determine whether the rotation speed of the input shaft is not less than a reference rotation speed, and an operation control unit configured to control engagement of the lock-up clutch based on the operation state of the ABS device and the result of comparison between the rotation speed of the input shaft and the reference rotation speed.

Abstract: A control apparatus for an automatic transmission including a torque converter with a lock-up clutch capable of connecting an output shaft of an engine and an input shaft of the automatic transmission includes a release determination unit configured to determine based on a deceleration and a reference deceleration whether to change an engaging state of an engaging mechanism that constitutes the set gear range of the automatic transmission to a release state when a brake operation is detected, and a control unit configured to control the engaging mechanism based on determination of the release determination unit.

Abstract: An automatic transmission of this invention includes a plurality of engaging mechanisms, and the plurality of engaging mechanisms include a mechanical engaging mechanism that functions as a brake. The mechanical engaging mechanism can switch a rotational element between a first state in which rotation is restricted only in one direction and a second state in which rotation is restricted in both directions. When switching from the first state to the second state, engagement control is started in advance for at least one of the plurality of engaging mechanisms to be set in an engaging state.

Abstract: This invention provides a control apparatus for an automatic transmission, which includes a plurality of engaging mechanisms. The plurality of engaging mechanisms includes a mechanical engaging mechanism configured to function as a brake. The mechanical engaging mechanism can be switched between a first state in which rotation of a rotational element is restricted only in one direction and a second state in which the rotation is restricted in both directions. When switching from the first state to the second state, the control apparatus executes engagement control to set a plurality of hydraulic friction engaging mechanisms in an engaging state. Control to set a predetermined hydraulic friction engaging mechanism in a half-engaging state and brake an output member can be executed in parallel to the engagement control.

Abstract: In a vehicular parking lock device, supplying a hydraulic pressure from pressure regulation of a line pressure by a linear solenoid valve to a hydraulic brake via a switching valve operated by a first solenoid valve enables a transmission to carry out a shift change. If desired that a parking lock is not operated when an engine stops, the hydraulic pressure stored under pressure in an accumulator is discharged to a drain oil passage by connecting the linear solenoid valve selectively to the drain oil passage by the first solenoid valve, thereby making it possible to prevent the hydraulic pressure stored under pressure in the accumulator from being supplied to a locking oil chamber at the other end of the hydraulic actuator. The first solenoid valve is used for both controlling the operation of the hydraulic brake and discharge of the hydraulic pressure stored under pressure in the accumulator.

Abstract: A parking lock apparatus includes an engaging mechanism, a slider, a hydraulic circuit, and a processor. The engaging mechanism is to prevent a rotation of a rotating body when the engaging mechanism is in a mechanical engagement state. The slider is to switch a state of the engaging mechanism between the mechanical engagement state and a mechanical disengagement state in accordance with a position of the slider. The hydraulic circuit is to change the position of the slider. The processor is configured to increase line pressure in the hydraulic circuit when the engaging mechanism is in the mechanical engagement state.

Abstract: The present invention provides an automatic transmission capable of properly judging faults of a switching mechanism. A control part ECU of the automatic transmission TM has an actual change gear ratio calculating part 10 and a fault judging part 11. Under a condition that the control part ECU has recognized that the first brake device B1 is switched to a reverse rotation preventing state, if the actual change gear ratio is kept to be an actual change gear ratio prior to a reduce of a rotational speed of a drive source ENG when the rotational speed of the drive source ENG is reduced, then the fault judging part 11 judges that a first brake B1 has a fault.