摘要:
A hydraulic control apparatus for controlling a vehicular automatic transmission including hydraulically operated frictional coupling devices which are selectively engaged and released to selectively establish gear positions having respective different speed ratios, and linear solenoid valves operable to regulate fluid pressures of the respective frictional coupling devices, each linear solenoid valve including a spool and a solenoid and being operable between a pressure-regulating state in which the spool is movable to a position of equilibrium of forces for regulating an output fluid pressure according to an electromagnetic force produced by the solenoid, and a non-pressure-regulating state in which the spool is held at a stroke end thereof at which no output fluid pressure is generated from the linear solenoid valve, each linear solenoid valve in the pressure-regulating state being operable to regulate a fluid pressure of the corresponding frictional coupling device according to the electromagnetic force, the hydraulic control apparatus including a pressure-regulation switching portion operable to effect a determination on the basis of a present state of a vehicle provided with the automatic transmission, as to whether each non-used linear solenoid valve, which is one of the linear solenoid valves that is not presently used to engage the corresponding frictional coupling device, should be placed in the pressure-regulating state or in the non-pressure-regulating state, the pressure-regulation switching portion placing each non-used linear solenoid valve selectively in the pressure-regulating or non-pressure-regulating states, according to a result of the determination.
摘要:
A control apparatus for controlling a vehicle automatic transmission including (i) a first coupling device to be engaged for establishing an emergency gear position and (ii) a second coupling device to be released for establishing the emergency gear position. The control apparatus includes: (a) first and second controller valves for controlling the respective first and second coupling devices; and (b) a fail-safe valve having (b-1) a first output port connected to a drain port of the first controller valve, (b-2) a first input port to which a working fluid is input, (b-3) a first drain port for draining the working fluid, (b-4) a second output port connected to an input port of the second controller valve, (b-5) a second input port to which the working fluid is input, and (b-6) a second drain port for draining the working fluid.
摘要:
A hydraulic control apparatus for controlling a vehicular automatic transmission including hydraulically operated frictional coupling devices which are selectively engaged and released to selectively establish gear positions having respective different speed ratios, and linear solenoid valves operable to regulate fluid pressures of the respective frictional coupling devices, each linear solenoid valve including a spool and a solenoid and being operable between a pressure-regulating state in which the spool is movable to a position of equilibrium of forces for regulating an output fluid pressure according to an electromagnetic force produced by the solenoid, and a non-pressure-regulating state in which the spool is held at a stroke end thereof at which no output fluid pressure is generated from the linear solenoid valve, each linear solenoid valve in the pressure-regulating state being operable to regulate a fluid pressure of the corresponding frictional coupling device according to the electromagnetic force, the hydraulic control apparatus including a pressure-regulation switching portion operable to effect a determination on the basis of a present state of a vehicle provided with the automatic transmission, as to whether each non-used linear solenoid valve, which is one of the linear solenoid valves that is not presently used to engage the corresponding frictional coupling device, should be placed in the pressure-regulating state or in the non-pressure-regulating state, the pressure-regulation switching portion placing each non-used linear solenoid valve selectively in the pressure-regulating or non-pressure-regulating states, according to a result of the determination.
摘要:
A control apparatus for controlling a vehicle automatic transmission including (i) a first coupling device to be engaged for establishing an emergency gear position and (ii) a second coupling device to be released for establishing the emergency gear position. The control apparatus includes: (a) first and second controller valves for controlling the respective first and second coupling devices; and (b) a fail-safe valve having (b-1) a first output port connected to a drain port of the first controller valve, (b-2) a first input port to which a working fluid is input, (b-3) a first drain port for draining the working fluid, (b-4) a second output port connected to an input port of the second controller valve, (b-5) a second input port to which the working fluid is input, and (b-6) a second drain port for draining the working fluid.
摘要:
A hydraulic control apparatus for use with a vehicle's automatic transmission, the apparatus including a fail-safe switch valve which has an escape-related output port connected to a drain port of a transmission-related solenoid valve corresponding to an escape-related frictional coupling device to establish an escape-related speed step, and additionally has an escape-related input port to which a hydraulic pressure is inputted, and a drain port from which a hydraulic fluid is drained, wherein the fail-safe switch valve is selectively switchable to a normal communication state thereof in which the escape-related output port and the drain port are communicated with each other and the escape-related input port is shut off, and to a fail-related communication state thereof in which the escape-related output port and the escape-related input port are communicated with each other, and the drain port is shut off, so that a hydraulic pressure is supplied from the escape-related output port of the fail-safe switch valve to the drain port of the transmission-related solenoid valve corresponding to the escape-related frictional coupling device.
摘要:
A hydraulic control apparatus for an automatic transmission including two frictional coupling devices of a first group and a plurality of frictional coupling devices of a second group, the control device including a second-group-engaging switching valve arranged to receive second engaging hydraulic pressures generated to engage the coupling devices of the second group and operable, upon reception of at least one of the second engaging hydraulic pressures, to generate a second-group-engaging pilot hydraulic pressure, and a fail-safe valve to receive at least one of first engaging hydraulic pressures generated to engage the two coupling devices of the first group and operable, upon simultaneous reception of the first engaging hydraulic pressure generated to engage one of the two coupling devices of the first group and the second-group-engaging pilot hydraulic pressure, to prevent application of the first engaging hydraulic pressure to the other of the two coupling devices of the first group.
摘要:
A hydraulic control apparatus for controlling an automatic transmission which includes two hydraulically operated frictional coupling devices of a first group and a plurality of hydraulically operated frictional coupling devices of a second group, and which is arranged to establish a selected one of its gear positions, by simultaneous engaging actions of the two frictional coupling devices of the first group or simultaneous engaging actions of of one of the frictional coupling devices of the first group and one of the frictional coupling devices of the second group, the hydraulic control device including a second-group-engaging switching valve which is arranged to receive second engaging hydraulic pressures generated to engage the hydraulically operated frictional coupling devices of the second group and which is operable, upon reception of at least one of the second engaging hydraulic pressures, to generate a second-group-engaging pilot hydraulic pressure, and a fail-safe valve which is arranged to receive at least one of first engaging hydraulic pressures generated to engage the two hydraulically operated frictional coupling devices of the first group and which is operable, upon simultaneous reception of the first engaging hydraulic pressure generated to engage one of the two frictional coupling devices of the first group and the second-group-engaging pilot hydraulic pressure, to prevent application of the first engaging hydraulic pressure to the other of the two frictional coupling devices of the first group.
摘要:
A hydraulic control apparatus for use with a vehicle's automatic transmission, the apparatus including a fail-safe switch valve which has an escape-related output port connected to a drain port of a transmission-related solenoid valve corresponding to an escape-related frictional coupling device to establish an escape-related speed step, and additionally has an escape-related input port to which a hydraulic pressure is inputted, and a drain port from which a hydraulic fluid is drained, wherein the fail-safe switch valve is selectively switchable to a normal communication state thereof in which the escape-related output port and the drain port are communicated with each other and the escape-related input port is shut off, and to a fail-related communication state thereof in which the escape-related output port and the escape-related input port are communicated with each other, and the drain port is shut off, so that a hydraulic pressure is supplied from the escape-related output port of the fail-safe switch valve to the drain port of the transmission-related solenoid valve corresponding to the escape-related frictional coupling device.
摘要:
A deceleration control apparatus for controlling a deceleration value of a vehicle, including a plurality of deceleration-value setting devices, a target-deceleration-value control portion operable to change a target deceleration value of the vehicle according to an operation of each of the deceleration-value setting devices, and a brake control portion operable to control a braking force to be applied to the vehicle, according to the target deceleration value changed by the target-deceleration-value control portion, wherein the target-deceleration-value control portion is operable to successively change the target deceleration value of the vehicle in response to successive operations of one and another of the plurality of deceleration-value setting devices such that the target deceleration value changed according to the operation of the above-indicated one deceleration-value setting device is subsequently changed according to the operation of the above-indicated another deceleration-value setting device.
摘要:
A piston operating a first clutch is disposed between a first drum accommodating the first clutch and a second drum accommodating a second clutch, and an oil reservoir storing lubricating oil that has lubricated the first clutch is provided on an inner cylindrical surface of a skirt portion of the piston. Barriers having different inner diameters are provided to the axial front and rear of the oil reservoir. When the second clutch is disengaged such that the amount of lubricating oil supplied to the oil reservoir increases, the lubricating oil overflows the barrier having the smaller inner diameter, and thus flows to the second clutch.