摘要:
A shift control apparatus for controlling shifting actions of an automatic transmission including a hydraulically operated frictional coupling device having a hydraulic cylinder which is supplied with a working fluid when the frictional coupling device is engaged, the shift control apparatus including a transient-hydraulic-pressure control device operable to control a transient value of a hydraulic pressure in the hydraulic cylinder according to an electric signal, upon releasing of the frictional coupling device, and an accumulator having a back-pressure chamber a back pressure of which is controllable, and an accumulator chamber connected to the hydraulic cylinder of the frictional coupling device and operable to control a transient value of the hydraulic pressure in the hydraulic cylinder, when the frictional coupling device is engaged with the working fluid being supplied to the hydraulic cylinder, and a back-pressure increasing portion operable to increase the back pressure in the back-pressure chamber of the accumulator for rapidly discharging the working fluid from the accumulator chamber, when the frictional coupling device is released to effect one of the shifting actions of the automatic transmission.
摘要:
An automatic transmission has a first brake, a third brake and a hydraulic actuator for the third brake substantially axially aligned in sequence from rear to front in a radially outer area of the transmission. In addition, a first planetary gear unit, a first one-way clutch and a second one-way clutch are provided in an axial sequence from rear to front, in a radially inner area of the transmission. In this manner, component members are mounted with good spatial efficiency in both radial and axial dimensions. Furthermore, because a carrier of the first planetary gear is connected to a third brake through the first one-way clutch, the carrier can be reversely rotated by disengaging the third brake, enabling six forward speeds.
摘要:
An operating device (40) for a state-changing element that is an embodiment of the present invention includes a detent mechanism (50) for displacing and positioning displacement members (22, 33) included in a state-changing element (10), an actuator (60) for driving the detent mechanism (50), and a control unit (5) that controls the actuator (60). The control unit (5) includes an initial motion means (S1) that, in a case of receiving a request to change the state of the state-changing element (10) and changing the position of a detent member (51), drives an electric motor (61) and reduces play in the rotation direction that exists in the actuator (60), and a management means (S2 to S5) that, when it has been determined that the play has been reduced, sets a value obtained by tacking on play in the rotation direction that exists in a coupling portion between a spindle (52) and an output shaft (63) to a rotation angle necessary for a position change of the detent member (51) corresponding to the request, as a target rotation angle of the electric motor (61).
摘要:
A vehicle control apparatus for a vehicle that includes a brake mechanism that produces braking force through the actuation of a first actuator and a shift mechanism that changes the shift position of a transmission through the actuation of a second actuator. The vehicle control apparatus includes: a controller that controls the electric power supplied to the first actuator and that controls the electric power supplied to the second actuator; a first electric power supply unit that supplies electric power to the controller; a second electric power supply unit that supplies electric power to the first actuator; and a third electric power supply unit that supplies electric power to the second actuator. An actuator control unit in the controller controls the electric power supplied to the second actuator from the second electric power supply unit or from the third electric power supply unit when the second actuator is not able to operate using the electric power supplied from the first electric power supply unit.
摘要:
An apparatus for controlling an automotive vehicle having an engine whose output is controllable independently of an accelerator pedal operation. The apparatus including an engine output increasing device for temporarily increasing the engine output upon a shift-down action of an automatic transmission during vehicle deceleration. An engine output increase amount determining device is provided for determining an amount of increase of the engine output by the engine output increasing device on the basis of a deceleration value of the vehicle and according to a predetermined relationship between the engine output increase amount and the vehicle deceleration value.
摘要:
A vehicle shift control device includes: a parking lock device selectively switched by driving of an electric motor between a lock position restraining rotation of wheels and a non-lock position not restraining the rotation of the wheels; and an electronic control device controlling the electric motor, the vehicle shift control device providing a parking lock switching control of selectively switching the parking lock device between the lock position and the non-locking position in an activated state of the electronic control device, wherein if the electronic control device is switched from the deactivated state to the activated state, the vehicle shift control device provides a wall abutment control of driving the parking lock device with the electric motor to a mechanical displacement end before starting the provision of the parking lock switching control, and if a temperature of the electric motor is lower than a predefined low-temperature determination value, the vehicle shift control device provides an electric motor heat generation control of energizing the electric motor without rotating the electric motor after the electronic control device is switched from a deactivated state to an activated state and before starting the provision of the wall abutment control.
摘要:
An actuator for a state changeover element that is actuated in a manner interlocking with the tilting of a tilt member is provided. The actuator is equipped with a rotational power generating portion, an output shaft coaxially and integrally rotatably coupled to a tilt spindle of the tilt member to output a rotational power generated by the rotational power generating portion, a casing that covers the actuator and having an opening for exposing one axial end side of the output shaft to an outside. The actuator is further equipped with a rotational angle limiting unit provided between the output shaft and a wall portion of the casing radially facing the output shaft to physically limit a rotational angle of the output shaft. A range changeover device for an automatic transmission equipped with this actuator and a parking device equipped with this actuator are provided.
摘要:
A control apparatus for a shift-position changing mechanism that changes the shift positions of an automatic transmission mounted in a vehicle using a rotational force of an actuator based on the state of an operation member includes: a detection unit that detects a command to change the shift positions based on a change in the state of the operation member; a control unit that controls the actuator such that the actuator is rotated by a predetermined rotation amount, when a predetermined first condition concerning the state of the vehicle is satisfied in a case the command to change the shift positions is not detected; and a determination unit that determines that a failure has occurred in the shift-position changing mechanism, when a predetermined second condition on the control of the actuator is satisfied.
摘要:
A control apparatus for a shift-position changing mechanism that changes the shift positions of an automatic transmission mounted in a vehicle using a rotational force of an actuator based on the state of an operation member includes: a detection unit that detects a command to change the shift positions based on a change in the state of the operation member; a control unit that controls the actuator such that the actuator is rotated by a predetermined rotation amount, when a predetermined first condition concerning the state of the vehicle is satisfied in a case the command to change the shift positions is not detected; and a determination unit that determines that a failure has occurred in the shift-position changing mechanism, when a predetermined second condition on the control of the actuator is satisfied.
摘要:
Second and third clutches are axially aligned so that the back side of the second clutch and the front side of the third clutch oppose each other, and a first clutch is positioned radially inward of the second and third clutches. Further, a clutch drum is extended so as to be used in common by the second and third clutches, the second clutch is engaged and disengaged from the axial front side by a second piston of a second oil pressure actuator, and the third clutch is engaged and disengaged from the axial rear side by a third piston of a third oil pressure actuator. The first through third clutches are positioned in a compact manner and can be independently operated.