Abstract:
A vehicle planetary gear device including a sun gear, a carrier, a ring gear, a clutch drum, clutch plates axially slidably fitted in the drum, a backing plate fixedly disposed in the drum on one side of a series of clutch plates, and a piston axially movable fitted in the drum and disposed on the other side of the series of clutch plates, and wherein the ring gear is fixedly fitted in the drum with its engaging teeth held in engagement with engaging grooves of the drum, and only two retainer rings are fixed on the drum and disposed on opposite sides of the ring gear and in contact with the teeth of the ring gear, or at least one retainer ring is fixed on the drum and disposed in contact with the teeth of one-piece member consisting of the ring gear and the backing plate, whereby axial movements of the backing plate and the ring gear relative to the drum are prevented by the two retainer rings or the at least one retainer ring.
Abstract:
A hydraulic control system including: a rotating speed raising unit for raising the rotating speed of the prime mover while the transmission is not rotated by the prime mover, to increase an output volume of the hydraulic pump; at oil pressure instructor for outputting a plurality of instruction signals of different pressure instruction values to the valve modulating mechanism while the output volume of the hydraulic pump is increased; an oil pressure detector for detecting the oil pressure to be modulated and fed to the transmission, at a plurality of pressure levels; and a learning corrector for learning and correcting the instruction signals on the basis of the outputted pressure instruction value and the detected oil pressure detected.
Abstract:
An apparatus for controlling the pressure of a hydraulically operated frictional coupling device which is released or engaged to achieve a shifting action of an automatic transmission, by first rapidly reducing or increasing the pressure to a predetermined level, holding the pressure at this level for a predetermined time and then continuously reducing or increasing the pressure to complete the shifting action. A learning compensation device is provided to update, by learning compensation, a selected control parameter influencing a pattern of change of the pressure of the coupling device during the shifting action such that the shifting action is achieved in a predetermined manner.
Abstract:
A control system for an automatic transmission which includes a first speed change unit for executing a predetermined speed change by applying/releasing two of a plurality of frictional engagement elements simultaneously and a second speed change unit capable of executing speed changes in at least two higher and lower stages are connected in tandem. The control system comprises: a speed change abnormality detector for detecting an abnormality in the speed change which is executed by applying/releasing the two frictional engagement elements of the first speed change unit simultaneously; and a first speed change unit speed change inhibitor for inhibiting the speed change, which is executed by applying/releasing the two frictional engagement elements in the first speed change unit, when the speed change abnormality is detected by the speed change abnormality detector.
Abstract:
Apparatus for controlling the amount of slip of a lock-up clutch of an automotive vehicle, which is provided in a fluid-operated power transmitting device such as a torque converter disposed between an engine and an automatic transmission, for direct connection of the engine and the automatic transmission, the apparatus including a pressure regulating valve for regulating a line pressure depending upon a load of the engine, a lock-up clutch slip control valve operable in a slip control mode for receiving the regulated line pressure and regulating a hydraulic pressure applied to the lock-up clutch to control the amount of slip of the lock-up clutch, a slip control mode detecting device for detecting an operation of the lock-up clutch slip control valve in the slip control mode, and a line pressure change restricting device for restricting an operation of the pressure regulating valve to restrict a change of the line pressure with a change in the engine during operation of the lock-up clutch slip control valve in the slip control mode.
Abstract:
A lubricating device for a motor vehicle including (a) a power transmission system having rotating members which are all at rest upon stopping of the vehicle, (b) a casing accommodating the power transmission system and storing a lubricating oil, and (c) an oil pump which is driven by the power transmission system and which operates to deliver the oil from the bottom portion of the casing to lubricating points of the power transmission system. An oil reservoir is provided to store a predetermined amount of the oil delivered by the pump, when a delivery amount of the pump exceeds a predetermined value with an increase in the speed of the power transmission system. A bath of the lubricating oil stored in the bottom portion of the casing has a first oil level when no oil is stored in the reservoir such that a portion of the power transmission system is immersed in the bath of the lubricating oil, and a second oil level when the predetermined amount of the oil delivered by the pump is stored in the reservoir such that the lower end of the power transmission system is located above the second oil level.
Abstract:
A control device for a drive line of a vehicle, in which a drive line from a power source to drive wheel includes a wheel control for controlling the speed of the wheels, and a connection mechanism for increasing/decreasing a torque transmission capacity between the power source and the drive wheels. The control device includes a trouble detector for detecting that the wheel control is in a situation unable to control the speed of the wheels normally. A braking detector detects that a braking operation to brake the rotation of the wheels is executed. And, a torque interruption control reduces the torque transmission capacity by the connection mechanism, when it is detected by the trouble detector that the wheel control cannot control the speed of the wheels normally and when it is detected by the braking detector that the braking operation to brake the rotation of the wheels is executed.
Abstract:
A method and apparatus for controlling a continuously variable transmission of a motor vehicle includes a controller that controls the speed ratio of the continuously variable transmission in accordance with a predetermined shift condition. The method and apparatus perform shift control in a specific manner during an operation of an anti-lock brake system, for example, by smoothing at least one of the rotational speed of the input shaft and the rotational speed of the output shaft, reducing a rate of change in the speed ratio during down shifting, restricting upshifting of the CVT, increasing an amount of hydraulic oil delivered from an oil pump, and/or increasing belt clamping force.
Abstract:
A system for integrally controlling an automatic transmission and an engine, wherein gear stages are automatically switched in accordance with a preset shift map, and an engine torque is changed by a predetermined change value during shifting to thereby maintain the satisfactory shift characteristics. The system includes a device for determining whether or not an engine torque change can be actually carried out without a problem; and means for regulating said engine torque change when said engine torque change cannot be actually carried out, to thereby prevent the problem from occurring.
Abstract:
A shift control of an automatic transmission including a first transmission section and a second transmission section, which are capable of shifting automatically and independently of each other, and the first transmission section and the second transmission section are simultaneously or alternately shifted, to achieve multi-gear shifts, in which when shifting is to be achieved by shifting the first transmission section and the second transmission section in directions opposite to each other, and shifting is a down shift in the automatic transmission as a whole, such shifting is prohibited. The advantages of the multi-gear shifts are thus fully utilized to avoid high shift shocks.