摘要:
In a method for downshifting of an automatic transmission of a vehicle according to an increase of throttle opening, a delay time between a judgement of a requirement of downshifting of the transmission and the execution of the downshifting is determined to base upon change rate of the throttle opening, and when the delay time was counted up, a requirement of downshifting of the transmission is again judged before the execution of any downshifting.
摘要:
A shift control system for controlling the shifts of a vehicular automatic transmission connected to an engine includes first and second transmission assemblies capable of executing the shifts independently of each other and connected in tandem to each other. The shift control system includes: shift deciding means for deciding that the shifts are to be executed, on the basis of input data; a shift pattern setting element for setting a shift pattern determining a shift point and a gear stage so that the decided shift may be other than the simultaneous one in which the first and second transmission assemblies are simultaneously shifted; and a gear stage determining element for outputting a shift signal so that the shifts may be executed according to the set shift pattern.
摘要:
An oil pressure control system for an automatic transmission which is equipped with a clutch including: an oil chamber; a piston adapted to be moved forward by pressure oil fed to the oil chamber; a plurality of friction discs adapted to engage when thrust by the piston; and a check valve assembly adapted to be opened by a centrifugal force, to release the pressure oil from the oil chamber. The control system comprises: an oil passage for feeding and releasing the pressure oil to and from the oil chamber; a limiter for limiting the inflow of the pressure oil into the oil chamber via the oil passage; an idle revolution detector for detecting that the clutch is idly revolving, to output an output signal when it detects the idle revolution; and a command unit made responsive to the output signal of the detector for limiting the inflow of the pressure oil into the clutch via the oil passage.
摘要:
A shift control system for an automatic transmission including first and second transmission assemblies, which are arranged in tandem to have their shifts controlled individually, and capable of selecting at least two gear stage trains, each being composed of a plurality of gear stages set by combining the first and second transmission assemblies, which are decided under a predetermined condition. It includes a running condition judgment device for judging the present running conditions including the set gear stages; a gear stage train decider for deciding such one of the gear stage trains as is suited for the running conditions; a gear stage train changer for changing one gear stage train to another; a simultaneous shift judgment device for judging if a change from the currently selected gear stage train to another gear stage train produces a simultaneous shift of both the first transmission assembly and the second transmission assembly; and a gear stage train change inhibitor for inhibiting changes of the decided gear stage trains if the simultaneous shifts are judged.
摘要:
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. At this state when the hydraulic pressure of the second oil chamber increases by the contraction of the outer configuration of a torque convertor by a decrease of the centrifugal force, the draining oil port is connected to the supplying port and the hydraulic pressure is supplied to the first oil chamber to increase the hydraulic pressure of the chamber.
摘要:
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.
摘要:
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. With the engine torque controlling device, satisfactory shift characteristics can be constantly obtained irrespective of the influence of enviromental factors on either engine output or the behavior of a hydraulic control device of the automatic transmission, so that shift shock can be decreased and the durability of the frictionally engaging devices can be improved.
摘要:
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.
摘要:
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.
摘要:
A drive power control apparatus for a vehicle includes a controller that adjusts the drive power for driving a vehicle to compensate for a parameter that affects the running state of the vehicle. When the vehicle enters a region where the acceleration of the vehicle needs to be changed based on the running environment or when the vehicle is traveling in the region in which the acceleration of the vehicle needs to be changed based on the running environment, the controller makes the amount by which the drive power is adjusted less than the amount by which the drive power is adjusted when the vehicle is traveling in a region other than the region in which the acceleration of the vehicle needs to be changed based on the running environment.