Abstract: A supplying port connecting to a supplying-side hydraulic pressure is arranged in a lock-up control valve. When the lock-up relay valve is switched ON (right half position), a supplying hyraulic pressure is supplied to a second oil chamber through an oil passage, led to a first oil chamber through an orifice and drained to a draining hydraulic oil passage through the oil passage. At this state in the lock-up control valve an inner pressure of the first oil chamber operates on a chamber through the oil passage, while an inner pressure of the second oil chamber operates on a chamber through the oil passage, and a controlling pressure from a linear solenoid valve operates on the controlling chamber. When the controlling pressure from the controlling chamber decreases by a deceleration of a vehicle speed, a valve closes a draining oil port and a drain port and increases an inner pressure of the first oil chamber.

Abstract: A hydraulic control apparatus for controlling a shifting action of a hydraulically operated frictional coupling device of an automatic transmission connected to a vehicle engine, from a neutral position to a forward drive position, in response to an operation of a shift lever.

Abstract: Hydraulic pressure which is regulated by a pressure control valve (linear solenoid valve) is applied to a hydraulic servo of a brake which is actuated when an engine-brake is effected. When the engine-brake is effected, a hydraulic pressure which is modulated by a modulator valve controlled by the linear solenoid valve is applied to the brake hydraulic servo. The pressure control valve provides high hydraulic pressure when vehicle speed is high based on signals from a speed sensor, and provides low hydraulic pressure when vehicle speed is low based on signals from the speed sensor, so that an engine-brake force is adequately controlled in accordance with vehicle speed. Furthermore, if a foot brake sensor is employed, the hydraulic pressure in accordance with vehicle speed can be made low when the engine-brake is effected with the foot brake applied.

Abstract: In a system for integrally controlling an automatic transmission and an engine comprising: a member for controlling the engine; a member formed separately of the engine control member, for controlling the automatic transmission; and various communication lines for connecting the engine control member and the automatic transmission control member to each other; judgments are made quickly and without fail as to whether trouble exists, such as disconnections or short-circuits of the various communication lines. When a trouble is detected, the proper control is maintained as much as possible in accordance with the types of trouble.

Abstract: A method for controlling switching over of speed stages of a transmission for a vehicle having two transmission units each independently operable to provide a plurality of gear ratios and connected in series to provide a plurality of overall gear ratios by the addition or balance of the gear of the two transmission units, having sensors for detecting operational conditions of the vehicle such as engine load and vehicle speed, sensors for detecting rotational speed of those intermediate rotational members in the respective transmission units which start to rotate or to stop by switching over of the speed stages, and a computing and controlling means which computes based upon the vehicle operating conditions a due period in which the switching over is to be completed and controls servo actuators for switching over the gear ratios of the transmission units so that the switching over operations for the two transmission units are completed with the end of the computed period.

Abstract: A hydraulic control apparatus for controlling a hydraulically operated automatic transmission, having a speed sensor for detecting the speed of a rotary member which changes due to a shifting action of a frictionally coupling device. The apparatus includes a device for determining, based on the detected speed of the rotary member, that the shifting action of the coupling device is completed, and a device which is operated in the event of a failure of the speed sensor, for determining that the shifting action of the coupling device is completed when a time which has passed after the moment at which the need to effect the shifting action was determined or at which a shifting command to initiate the shifting action was generated exceeds a predetermined time interval. Upon determination of the completion of the shifting action, an electronic device terminates an operation to control the back pressure of an accumulator for adjusting the fluid pressure applied to the coupling device.

Abstract: In a system for integrally controlling an automatic transmission and an engine, an apparatus for controlling the automatic transmission and an apparatus for controlling the engine are formed separately from each other to reduce size and cost, and to facilitate the mounting of control means onto a vehicle. Further, if trouble occurs in this communication system between the engine control apparatus and the automatic transmission control apparatus countermeasures are properly performed, and a trouble is reduced as much as possible.

Abstract: In a system for integrally controlling an automatic transmission and an engine, wherein hydraulic control devices are operated and engagement of frictionally engaging devices are selectively switched, to thereby achieve a shifting, and an engine torque is changed during shifting, a rate of change with time of oil pressure supplied to the frictionally engaging devices is temporarily reduced in association with the completion of the engine torque change. With this arrangement, rise of an output shaft torque generated at the time of completion of the engine torque change can be controlled, so that satisfactory shift characteristics can be obtained.

Abstract: In an accumulator including a piston which slides freely in a cylinder and a spring which presses the piston, a hole of the piston end where, at the bottom, a large diameter section is made, and small diameter section whose diameter is smaller than that of the large diameter section is located at another side of the large diameter section is located at another side of the large diameter section against the bottom of the hole is provided, and the spring assembly having the retaining member and the coil spring whose one end is fixed to the retaining member and another end is free is provided, and the snap ring is provided to hold the retaining member between the bottom of the hole and the snap ring which is installed in the large diameter section with radial expansion force, so that the spring assembly is installed in the hole of the piston.

Abstract: A device integrally controls an engine having a supercharger and an automatic transmission. More specifically, boost pressure to the engine can be selectively introduced continuously or gradually, and oil pressure in a hydraulic control device of the automatic transmission is increased or decreased in accordance with the selected value of the boost pressure and an intake air temperature value. As a result, shift shock is low irrespective of output fluctuations of the engine due to a change in the boost pressure to and intake air temperature of the engine, and moreover, durability of the frictionally engaging devices is achieved.

Abstract: The engine idling speed control system in an internal combustion engine for a vehicle provided with an automatic transmission device. A shift down operation induced for attaining an engine braking effect is detected, and upon detection of such a shift down operation, the idling speed control system is controlled so that the intake air amount is incremented. As a result, an increase in an engine torque is obtained for decreasing shock during a shift down operation executed in an automatic transmission.

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 device for controlling engine torque in a vehicle which includes an engine and an automatic transmission, and for changing the engine torque during shifting of the automatic transmission by an engine torque change value determined in association with at least engine load. The device includes a detecting device for detecting at least one of intake air pressure, cooling water temperature of an engine, oil temperture of an engine, and oil temperature in a hydraulic control device of the automatic transmission; a determining device for determining the engine torque change value in further association with at least one of the intake air pressure, the cooling water temperature of the engine, the oil temperature of the engine, and the oil temperature in the hydraulic control device of the automatic transmission; and a changing device for changing engine torque during-shifting of the automatic transmission by the determined engine torque change value.

Abstract: A system for controlling an engine torque is provided, wherein the engine torque is changed by predetermined values when an automatic transmission is shifting to satisfactorily maintain the shift characteristics of an automatic transmission. An operating area for controlling the engine torque change and/or the predetermined values are corrected in accordance with temperature in an exhaust system of engine, or the frequency of the engine torque change. As a result, rise in temperature in the exhaust system, worsened fuel consumption rate and deteriorated contents of exhaust gas, which are caused due to the frequent torque changes can be avoided.

Abstract: A failsafe system in an automatic transmission includes: a device for detecting rotary speed of an output shaft of the automatic transmission; a device for detecting either rotary speed of a rotary member other than the output shaft of the automatic transmission or engine rotary speed. When a correlation between the output shaft rotary speed and either the rotary speed of the rotary member or the engine rotary speed is abnormal, control oil pressure in a hydraulic control device of the automatic transmission is increased, whereby slippage in frictionally engaging devices in the hydraulic control device of the automatic transmission during non-shift are effectively eliminated.

Abstract: A hydraulic pressure control device in an automatic transmission, provided thereon with a mechanism capable of regulating oil pressure in response to a command value from a calculating device, including: a device for detecting oil pressure in the hydraulic pressure control device; a device for comparing the oil pressure thus detected with a target value; and a device for correcting the command value from the calculating device in accordance with the result of the comparison, wherein the oil pressure actually generated in the hydraulic pressure control device is directly detected, and the command value to control the oil pressure is corrected while the oil pressure thus detected is compared with an ideal value (a target value). With this arrangement, highly accurate oil pressure control can be continuously carried out, irrespective of variations peculiar to a mechanical system and variations in use conditions.

Abstract: An apparatus controls braking force during changes in drive position of an automatic transmission. The apparatus includes a first sensor, a second sensor, a controller and a brake device. The first sensor detects manual operation of the automatic transmission and outputs a first signal during the manual operation of the automatic transmission. The second sensor detects engine load and outputs a second signal. The controller receives the first and second signals, and outputs a controlling signal during the manual operation of the automatic transmission and a condition that the engine load is less than a predetermined value. The brake device receives the controlling signal and is actuated to generate braking force in accordance with receipt of the controlling signal. Accordingly, when the automatic transmission is manually operated and the engine load is less than the predetermined value, the vehicle is braked.

Abstract: In a device for controlling a quantity of lubricating oil in an automatic transmission for a vehicle, wherein a pump is rotated to circulate the lubricating oil, a circulation quantity of lubricating oil is increased, decreased or changed in accordance with the speed of the vehicle. As a result, the circulation quantity of lubricating oil in the automatic transmission is constantly regulated to ensure the necessary and sufficient quantities, even when there is a throttle opening of zero, and more particularly, even during high speed coasting.

Abstract: In a shift control system of an automatic transmission, wherein the shift control system includes a first and a second transmissions capable of automatically switching speeds separately of one another, and the first and the second transmissions are shifted simultaneously or alternately, to thereby achieve multi-speed shifts, there is provided a system for starting and completing changes in rpm for the shift of rotary members of the second transmission during the operation of changes in rpm for the shift of rotary members of the first transmission, particularly when the first transmission is high gear shifted and the second transmission is shifted simultaneously, whereby the automatic transmission as a whole is up shifted, so that the shift characteristics can be maintained satisfactorily.

Abstract: A shift control system of an automatic transmission for a vehicle, which includes at least a first transmission and a second transmission, both of which can shift speeds automatically, wherein the first transmission and the second transmission are shifted simultaneously or alternately to achieve multi-speed shifts, an acting force of a frictionally engaging device for switching the second transmission can be properly changed at least in accordance with the types of shifts at the time of switching of the frictionally engaging device, so that, even when any type of shift is performed, the stable shift characteristics having a low shift shock is constantly obtained and no excessive load is applied to the frictionally engaging device.