Abstract: For a hybrid vehicle including an engine, a motor generator, and a belt-type continuously variable transmission, a controller performs a low speed position return expediting control in response to a downshift request accompanying deceleration. During the low speed position return expediting control, the controller increases a differential pressure between a primary pressure and a secondary pressure and cause a downshift toward a lowest speed position transmission ratio by reducing the primary pressure, and further reduces the primary pressure when the secondary pressure becomes greater than or equal to a trigger threshold value during the downshift; and terminates the low speed position return expediting control when an actual secondary pressure decreases to a secondary pressure minimum level. The controller further sets a secondary pressure lower limit higher than the secondary pressure minimum level during the low speed position return expediting control.

Abstract: An electro-hydraulic control system for a multispeed transmission having a plurality of torque-transmitting mechanisms includes a controller for operably controlling the transmission, a fluid source for supplying hydraulic fluid, and a plurality of torque-transmitting mechanisms being operably selected between an applied and an unapplied state to achieve a plurality of ranges including at least one reverse, a neutral, and a plurality of forward ranges. The system includes a plurality of trim systems having pressure control solenoids and trim valves. The system may also include one or more shift valves disposed in fluid communication with the fluid source and being capable of moving between stroked and de-stroked positions. In any given range, only two of the plurality of torque-transmitting mechanisms may be applied. Moreover, three of the plurality of pressure control solenoids are normally high solenoids, and the remaining solenoids are normally low solenoids.

Abstract: In an automatic transmission control device of the invention configured to start an increase in engagement pressure of a start-up engagement element, when a determination threshold value for determining that a turbine rotational speed has reduced is reached or exceeded, the determination threshold value when a selection operation from a non-traveling range to a traveling range is made before a prescribed period of time from starting of an engine has elapsed, is increased and set greater than the determination threshold value when the selection operation is made after the prescribed period of time has elapsed. Accordingly, a reduction in the turbine rotational speed can be accurately determined, and thus it is possible to suppress torque fluctuations, occurring owing to engagement of a second brake, which is the start-up engagement element.

Abstract: A control device for a vehicle includes an electronic control unit configured to increase a disengagement-side instructed pressure such that an input rotation speed decreases when overspeeding of the input shaft occurs during a coast downshift of an automatic transmission. Overspeeding of the input shaft in a disengagement-side element that forms a gear stage before a downshift having a lower gear ratio than that after the downshift is suppressed.

Abstract: Systems and methods for operating a driveline of a hybrid vehicle are disclosed. In one example, an engine may enter or stay in one of two cylinder deactivation modes or enter or stay in a combustion mode in response to a request to downshift a transmission while a vehicle in which the engine resides is coasting.

Abstract: A vehicle control device in a vehicle including an engine and a multi-speed transmission having a plurality of gear positions, each gear position out of the plurality of gear positions established by engaging predetermined engagement devices out of a plurality of engagement devices, the vehicle control device including a shift control portion configured to control release of a release-side engagement device of the plurality of engagement devices and engagement of an engagement-side engagement device of the plurality of engagement devices so as to switch the gear position established in the multi-speed transmission, and an engine control portion configured to provide idling-reduction control of temporarily stopping the operation of the engine based on a predetermined engine stop condition.

Abstract: After engagement of a clutch is suppressed from being started and a rotational speed of an input shaft of an automatic transmission is suppressed from being increased due to an increase in rotation resistance of the input shaft of the automatic transmission, which occurs by half-engagement of a clutch, the clutch is disengaged, and the clutch is completely engaged. In this way, the clutch is completely engaged after the rotational speed of the input shaft is suppressed from being increased. Thus, a heat generation amount of the clutch can be reduced, and furthermore, durability of the clutch can be improved by a reduction in the heat generation amount.

Abstract: A vehicle control device including an electronically controlled throttle device and configured to control a vehicle for supplying a hydraulic pressure to a friction engaging element of a transmission on the basis of a throttle valve opening controls a start timing of a supply of the hydraulic pressure to the friction engaging element on the basis of an accelerator pedal opening and the throttle valve opening if a shift lever is changed from an advance position to a reverse position or from the reverse position to the advance position.

Abstract: A circuit for controlling hydraulic pressure of a torque converter that includes an engagement hydraulic pressure chamber independently installed in a fluid operation chamber enclosed by a front cover and an impeller and having engagement hydraulic pressure supplied to engage a lock-up clutch may include a torque converter control valve stably decreasing line pressure and supplying the decreased line pressure as operation hydraulic pressure of the torque converter, a torque converter pressure control valve controlled by a linear solenoid valve to control D range pressure and supply the controlled D range pressure to the engagement hydraulic pressure chamber, and a lock-up switch valve controlled by the linear solenoid valve to supply the hydraulic pressure supplied from the torque converter control valve as control pressure of the torque converter pressure control valve and supply exhaust hydraulic pressure of the torque converter as control pressure of the torque converter control valve.

Abstract: A system and method for fast fill of a hydraulic accumulator used in an automatic transmission includes providing an active fast fill mechanism fluidly connected to a hydraulic accumulator and a hydraulic system of the automatic transmission, providing an electronic control module in communication with the active fast fill mechanism, activating, by the electronic control module, the active fast fill mechanism to allow the hydraulic accumulator to fill with fluid from the hydraulic system, filling, by the active fast fill mechanism, the hydraulic accumulator with fluid, and de-activating, by the electronic control module, the active fast fill mechanism to stop filling the hydraulic accumulator with fluid from the hydraulic system during stop/start engine events of a vehicle.

Abstract: A weight training machine for allowing at least two of a user's muscle groups to push or pull simultaneously in a synchronized and unified fashion, having at least one common counter or weight resistance mechanism; a first actuating means operatively connected to the at least one common counter or weight resistance mechanism for allowing actuation of the at least one common counter or weight resistance mechanism by a first of the user's muscle groups, and a second actuating means operatively connected to the at least one common counter or weight resistance mechanism for allowing actuation of the at least one common counter or weight resistance mechanism by a second of the user's muscle groups, wherein actuation of both the first actuating means and the second actuation means simultaneously acts upon and or resists against the at least one common counter or weight resistance mechanism. One embodiment is an exercise machine and a drive or actuating mechanism with a lever and fulcrum configuration.

Abstract: A control method for an automatic transmission in which a starting gear shift stage is attained by fastening a predetermined brake element and a predetermined clutch element includes a step of supplying, when a command, which is for fastening the predetermined brake element and the predetermined clutch element that is to be fastened to input output rotation on an engine side to a transmission mechanism, and which is also for attaining the starting gear shift stage is detected, hydraulic pressure to the clutch element and then fastening the clutch element, and a step of supplying, after the step, the hydraulic pressure to the brake element to start the fastening of the brake element and controlling rotation, which is input to the transmission mechanism, to a target number of rotations. It is possible to satisfactorily attain the starting gear shift stage without a shock while dispensing with a one-way clutch.

Abstract: A first torque determining unit determines a value of a torque input to a transmission on the basis of a load acting on a start clutch (12), and a second torque determining unit determines a value of a torque input to the transmission on the basis of a manipulated amount of an accelerator pedal. After the accelerator pedal is manipulated while the start clutch (12) is in a released state, as long as the torque determined by the first torque determining unit (31a1) is less than the torque determined by the second torque determining unit (31a2), the torque input to the transmission is limited to the torque determined by the first torque determining unit (31a1).

Abstract: A control device controls a transmission mechanism which includes a first clutch to be engaged at startup and a second clutch, and is interlocked when hydraulic pressure is supplied to the first and second clutches and when the first and second clutches are completely engaged. The control device includes a hydraulic pressure control unit controlling hydraulic pressure supplied to the transmission mechanism so that the first clutch is set in a completely engaged state and the second clutch is set in a slip interlock state where the second clutch is not completely engaged in the case of a return from an idle stop control in which an engine is automatically stopped. The hydraulic pressure control unit starts reducing hydraulic pressure supplied to the second clutch when an increased amount of an engine rotation speed per unit time becomes smaller than a predetermined value.

Abstract: A control apparatus for an automatic transmission having a rotation transmission mechanism for transmitting rotation of a prime mover mounted on a vehicle to a speed change mechanism, and an input clutch for controlling connection/disconnection of the transmitted rotation. The control apparatus includes a control portion that performs a neutral control including a release control that reduces rotation transmission efficiency, and an in-neutral control so as to maintain rotation efficiency. During the in-neutral control, a check control is performed that makes the fluid pressure relative to the input clutch fluctuate, and when determining as a result of the check control that the rotation transmission efficiency is in a predetermined low efficiency state, then reducing the fluid pressure relative to the input clutch by a set pressure, and thereafter maintaining the fluid pressure constant.

Abstract: When initial control ends, an ECU executes a program that includes the steps of: calculating a return control progression degree; calculating a target amount of change in turbine speed; calculating a feedback gain; calculating a target turbine speed; calculating a deviation between the target turbine speed and turbine speed NT; determining a hydraulic pressure command value; outputting the hydraulic pressure command; and when the turbine speed is synchronized with a first gear synchronization speed, outputting the maximum hydraulic pressure command.

Abstract: A method for controlling a transmission includes applying a reference stroke pressure to an oncoming control element while executing a downshift to a target gear, determining a stroke pressure adjustment in response to a turbine speed flare during the downshift, and re-executing the downshift while applying to the oncoming element an adapted stroke pressure that is a sum of the stroke pressure adjustment and the reference stroke pressure.

Abstract: A method for operating an automatic transmission of a motor vehicle, in particular a variable-speed transmission. The automatic transmission includes at least five shift elements and to transfer torque or force transfer in a forward gear and a reverse gear at least three shift of the at least five elements are engaged. When shifting the automatic transmission from a neutral position to a forward or a reverse gear, at least one of the three shift elements of the automatic transmission that are engaged in the respective forward or reverse gear, is engaged in a controlled manner.

Abstract: A hydraulic or pneumatic control device for an automated shift transmission including actuating devices with actuating cylinders (15, 16) having pressure spaces (19a, 19b; 20a, 20b). The pressure spaces (19a, 19b; 20a, 20b) of the actuating cylinders (15, 16) can be connected by a respective control valve (22a, 22b; 32a, 32b) to a pressure line (26), which can be selectively connected to or cut off from a main pressure line (8) by a main shut-off valve (45a). At least one additional main shut-off valve (45b) is arranged in parallel with the first main shut-off valve (45a) between the main pressure line (8) and the pressure line (26) to improve the control characteristics and increase the operational reliability.

Abstract: A work machine includes an internal combustion (IC) engine having an output, and an infinitely variable transmission (IVT) coupled with the IC engine output. The IVT includes a hydraulic module and a mechanical drivetrain module. A pressure transducer is associated with and provides an output signal representing a hydraulic pressure within the hydraulic module. At least one electrical processing circuit is configured for controlling the IC engine output, dependent upon the output signal from the pressure transducer.

Abstract: An upshift control system and method of an automatic transmission. The system includes a vehicle speed detector outputting a vehicle speed signal; a transmission control unit for receiving the signal, calculating a target hydraulic pressure based on a change of the vehicle speed, and outputting a control signal corresponding to the target hydraulic pressure; and an actuator for controlling an actual hydraulic pressure of an on-coming element based on the control signal. The method includes determining whether a vehicle speed changes during an upshift; calculating the change of the vehicle speed; calculating a target hydraulic pressure based on the change of the vehicle speed; and controlling an actual hydraulic pressure of an on-coming element based on the target hydraulic pressure. The target hydraulic pressure may be calculated by adding a modified hydraulic pressure, proportional to the rate of change of the vehicle speed, to a constant reference hydraulic pressure.

Abstract: An ECU executes a program that includes the steps of i) calculating a sporty running counting SC based on a state of a vehicle according to an operation of a driver; ii) changing a condition for executing sporty running in which an upshift is inhibited when an accelerator is suddenly released and in which a downshift is promoted during sudden braking such that the condition is easier to satisfy and changing a condition for returning from sporty running so that it is more difficult to satisfy when the sporty running count SC is equal to or greater than a threshold value; and iii) changing the condition for executing sporty running so that it is more difficult to satisfy and changing the condition for returning from sporty running so that it is easier to satisfy when the sporty running count SC is not equal to or greater than the threshold value.

Abstract: A method for controlling the shift sequence of a multispeed automatic gearbox in which, to reach a target gear called for, multiple shifts through one gear-step can be carried out. A target gear from a currently engaged gear is proposed and, which is several gear-steps away from this current gear, is engaged as a function of the current driving situation, optionally by a direct multiple shift in one step or by a combination of several successive single shifts each of only one gear-step or by a combination of several successive double or multiple shifts each of two or more than two gear-steps or by a combination of at least one double or multiple shift and at least one single shift or by a combination of at least one double shift and at least one multiple shift.

Abstract: The present invention provides an assembly for use in a transmission that includes a first rotating member having a first portion and a second portion, the second portion having an outer diameter greater than an outer diameter of the first portion and having a bore with an open end. An annulus has a port for providing a fluid and is disposed proximate to the first portion. A second rotating member is at least partially located within the bore and extends from the open end. A first passage is connected to the port of the annulus and a second passage is connected to the first passage. The second passage is located through the second portion. A third passage is connected to the second passage and is located in the second rotating member. Fluid is able to flow from the port through the passages to provide fluid to the second rotating member.

Abstract: In a method and control device for adjusting a rotational speed of a shaft of a gear change transmission of a motor vehicle, a torque required for the acceleration of the transmission and derived from a drive motor is transmitted by means of an automated clutch and using the torque the rotational speed of the shaft is precisely and rapidly adjusted to a range around a target rotational speed by defining a desired value for a position of the clutch on a rotational speed difference between a measured rotational speed of the shaft and a target rotational speed so that the gear can then rapidly be changed.

Abstract: A power-on 2-3 upshift control method for an automatic transmission comprises: determining whether a power-on 2-3 upshift condition exists; extracting an initial hydraulic pressure control duty and hydraulic pressure control duty depending on an input torque from a map table for an on-coming friction element and an off-going friction element, if it is determined that the power-on 2-3 upshift condition exists, and performing a shift control for the upshift; and completely releasing a hydraulic pressure of the off-going friction element at a point at which a hydraulic pressure for the on-coming friction element is capable of tolerating a turbine torque.

Abstract: According to a preferred embodiment of the present invention, a “special neutral” is commanded to initiate the neutral to range shift. The “special neutral” of the present invention is special in that while the transmission output speed remains unconstrained, the transmission input speed is locked at zero. This condition is particularly advantageous because on-coming clutches may be applied without relative motion between the respective clutch plates. Therefore, by initiating the neutral to range shift from the “special neutral” of the present invention, the ratio change may take place irrespective of engine speed, with zero slip loss and more quickly than previously possible.

Abstract: In a control apparatus for a vehicular automatic transmission and a method of controlling a vehicular automatic transmission, a brake operation amount by which the brake of a vehicle is operated is detected, and a neutral control is executed to decrease an engagement pressure for a friction engagement element of the automatic transmission, when a shift lever is in a forward gear position, an accelerator pedal is not operated, the brake is operated, and the vehicle is stopped. The engagement pressure for the friction engagement element is increased when the detected brake operation amount decreases during the neutral control.

Abstract: A hydraulic control apparatus for an automatic transmission provided with a friction engaging element that operates using hydraulic pressure includes a range pressure oil passage which is connected to the friction engaging element; a manual valve which is connected to the range pressure oil passage; a drain port which is formed in the manual valve and which drains hydraulic pressure of the range pressure oil passage; a drain oil passage which is connected to the drain port; and a drain pressure controller which is connected to the drain oil passage and which performs control so as to change a decreasing rate of drain pressure of the drain oil passage.

Abstract: A shift control system for an automatic transmission. The shift control system includes an oil temperature sensor, a hydraulic controller to operate a hydraulic clutch, and a control unit in operative communication with the oil temperature sensor and the hydraulic controller. When a gear shift is requested just after an engine restart, the control unit controls the hydraulic clutch with an adjusted shift control process, in contrast to a normal condition of the engine. This adjustment is determined based on a first oil temperature at a time point when the engine is last stopped and on a temperature difference between the first oil temperature and a second oil temperature at a time point when the engine is last restarted after the last engine stop.

Abstract: In a gearbox control system (8) for detecting systematic errors and long-term changes, the behavior of a real gearbox (1) is compared to the behavior of an ideal gearbox (7), which is implemented in the form of a gearbox model in the gearbox control system (8).

Abstract: Under the learning mode during a vehicle stationary condition, an oil pressure of the friction engagement element for setting a standby oil pressure value is increased by a predetermined step pressure while a transmission input shaft rotational speed has been maintained, and a standby oil pressure is set for shifting the friction engagement element to an engagement side. A controlled value is verified whether it is within a predetermined range corresponding to the predetermined step pressure when a change of the input value due to decrease of the turbine rotational speed satisfies a predetermined condition. The controlled value is learned when the controlled value is within the predetermined range corresponding to the step pressure. A step pressure larger than the step pressure is set when the controlled value is beyond the predetermined range corresponding to the step pressure.

Abstract: A hydraulic clutch transmits driving torque in a power train of a vehicle. An oil pressure supply unit supplies oil pressure for engagement to the clutch and a controller controls the unit. The controller causes the unit, prior to engagement of the clutch, to precharge the interior of the clutch with hydraulic fluid. The controller counts an elapsed time since the last release of the clutch and shortens the precharge period as the elapsed time decreases, thereby optimizing the precharge state of the clutch.

Abstract: An automatic transmission system for a vehicle includes a rotational speed detector for detecting a variation of a rotation number of driving torque transmitting member when a friction engagement element, which has been disengaged based upon oil pressure controlled by a control unit, a side of which has been transmitted with the rotation of the driving torque transmitting member, and the other side of which is locked not to be rotated during the vehicle at a stationary condition, is controlled to be engaged, wherein an oil pressure characteristic value of the friction engagement element is learned by the control unit based upon the variation of the rotation number of the driving torque transmitting member when the friction engagement element is initially engaged.

Abstract: The method for decreasing gear select shock comprises determining whether a vehicle is stopped and if idle conditions exist based on vehicle operating parameters. It is then determined whether the vehicle has been stopped for longer than a predetermined period. If it is determined the vehicle has been stopped for longer than the predetermined period, the automatic transmission is up-shifted into a higher speed gear from a first speed gear. The automatic transmission may then be shifted into neutral from a drive range through line pressure control, upon detecting selection of a neutral gear.

Abstract: A transmission system includes a first clutch, a second clutch, and a controller. The controller communicates with the first and second clutches and commands a gear shift. The controller calculates a torque phase time for the gear shift and determines a desired torque trajectory within said torque phase time. The controller determines on-coming torque values for the second clutch and off-going torque values for the first clutch to achieve the desired torque trajectory within the torque phase time. The controller calculates an on-coming clutch pressure based on the on-coming torque value, and an off-going clutch pressure based on the off-going torque value. The controller delays actuation of the first and second clutches to compensate for hydraulic delays.

Abstract: A hydraulic control system for an automatic transmission, in which four forward speeds and one reverse speed are realized by the use of a reduced number of friction elements compared to the prior art such that overall structure is simplified, the weight of the automatic transmission is decreased, and the cost of production is reduced. In the hydraulic control system, hydraulic pressure generated in an oil pump is controlled to a predetermined level by a regulator valve, and part of this pressure is supplied as operational pressure of a damper clutch and to a reducing valve, and another part of this pressure is supplied to a hydraulic pressure control section for the selective supply of operational pressure to friction elements that are engaged in each shift range and speed, the hydraulic pressure control section including a shift control assembly, a hydraulic pressure control assembly, a switching assembly, a fail-safe assembly, and a N-R control assembly.

Abstract: A shift control apparatus for a vehicular automatic transmission provided with a fuel cut apparatus which cuts off fuel supplied to an engine when an engine speed exceeds a predetermined value during deceleration of a vehicle, and an automatic transmission in which a gearshift is achieved with a clutch-to-clutch downshift in which a hydraulic friction device to be released is released and a hydraulic friction device to be applied is applied, further includes a controller. The controller corrects, through learning control, an apply pressure of at least one of the hydraulic friction devices to be operated for the clutch-to-clutch downshift such that an amount of drop in a rotational speed of an input shaft of the automatic transmission increases when that amount of drop is less than a predetermined value during the clutch-to-clutch downshift.

Abstract: In the case where a signal for coasting time downshifting is output while fuel cut is performed and fuel supply is stopped, and a hydraulic pressure PC1 of a low speed side frictional engagement device is being gradually increased and an engine speed NE is being increased, when the fuel cut is cancelled and the fuel supply is restarted, the hydraulic pressure PC1 is reduced to a hydraulic pressure value immediately before an amount of torque is applied to the low speed side frictional engagement device.

Abstract: A shift control apparatus of an automatic transmission of a vehicle and a method therefore is disclosed, the method comprises the steps of: discriminating whether a shift lever of the automatic transmission is switched from reverse range ‘R’ to neutral range ‘N’; calculating a lapsed time when the shift lever is set at neutral range ‘N’, if confirmation occurs that the shift lever is switched from reverse range ‘R’ to neutral range ‘N’ at a previous step and discriminating whether the shift lever is switched from neutral range ‘N’ to forward drive range‘D’; and performing a shifting operation with a different shifting oil pressure depending on the lapsed time, when the shift lever is set at the neutral range ‘N’, if confirmation occurs that the shift lever is switched from neutral range ‘N’ to the forward drive range ‘D’ at the previous step, wherein the oil temperature of the automatic tran

Abstract: There are arranged an engine 10 having idle-stop control means and an automatic transmission 20 having as a hydraulic-pressure supply source a main pump 22 driven by the engine 10 to perform speed change control. There are arranged a bypass hydraulic passage 45 for ensuring communication between said main pump 22 and a point immediately before an engagement-pressure supply port of a forward engagement element L/C in the automatic transmission, a switching valve 44 on the bypass hydraulic passage 45 for allowing switching between the communicating state and the non-communicating state, and switching-valve control means for switching the switching valve 44 between the communicating state and the non-communicating state. With this, the main pump is stopped at idle-stop control to supply the hydraulic pressure required for restart, allowing smooth running.

Abstract: Disclosed is a method for controlling and regulating the drive train of a vehicle, comprising a drive unit, a transmission and an output unit. The transmission has controllable free-wheel units corresponding with pairs of toothed wheels for disengaging or engaging an old or a new gear and a clutch mounted on the output side. In the presence of a shift command for carrying out a higher traction shift, the transmission capacity of the clutch is adjusted in a manner such that a current drive torque of the drive unit applied to said clutch is transmitted to the output unit and the clutch exhibits at least an approximately slip-free state. When a higher traction shift exists, an operative connection is suddenly created between a controllable free-wheel unit and a corresponding pair of toothed wheels of the new gear, and the operative connection of the old gear is at least almost simultaneously canceled.

Abstract: Device and method for shift control in an automatic transmission of a vehicle wherein the feedback control includes determining relative rate of change in turbine revolution during power-on up-shift, thereby preventing generation of shift impact in the shifting process. The device comprises a vehicle run state detecting unit for detecting a vehicle run state; a shift control unit for performing a power-on up-shift control, including controlling the relative rate of change in turbine revolution; and a driving unit for supplying and stopping supply of oil pressure discharged from an oil pump to perform the shifting in response to shift mode state output synchronization, throttle valve openness, revolution at output shaft, engine revolution, shift lever position and acceleration pedal operation state.

Abstract: A gear actuator for engaging and disengaging gears in an automatic manual transmission has a single working piston or two working pistons provided with a first working piston surface and a second working piston surface. An auxiliary piston is provided also. A pressure control valve controls a pressure supplied to the second working piston surface. A shut-off valve is provided. The first working piston surface and the pressure valve are supplied with a system pressure of a hydraulic system. The first working piston surface and the pressure control valve can be decoupled from the system pressure of the hydraulic system by the shut-off valve.

Abstract: An automatic transmission is driven by an engine through a torque converter. The transmission includes a plurality of friction elements which are selectively engaged to provide a selected gear thereby to transmit the power of engine to an output shaft of the transmission while changing the rotation speed. A speed change completion degree estimating system is provided, which comprises a first section that derives a difference (Nt−Ne) between an input rotation speed (Nt) of the transmission and an engine rotation speed (Ne); a second section that derives a difference (g×No−Ne) between the input rotation speed (g×No) of the transmission provided after completion of the speed change operation and the engine rotation speed (Ne); and a third section that calculates a speed change completion degree (Shift) of the transmission by using a ratio between the (Nt−Ne) and the (g×No−Ne).

Abstract: When a racing of engine occurred during a speed change, an oil pressure is forcibly supplied to a friction engagement element to be released, and a back pressure of an accumulator disposed in an oil supply pipe of this friction engagement element of release side is increased in stepwise.

Abstract: When a transmission selector lever is operated from P or N range to D range, an input clutch to be engaged at the fifth gear position is temporally engaged to reduce shift shock when the engaging element for the first gear position is engaged. An oil pressure command value for actuating the input clutch is increased with a constant inclination from a start point oil pressure value, and the start point oil pressure value is lowered when the engine speed is low or when an oil temperature is high. Even if a timing of completion of filling of working fluid to the input clutch is fluctuated, the difference between the actual oil pressure and the oil pressure command value is suppressed to a small level and the occurrence of shock due to surge at the time of the filling completion is prevented.

Abstract: It is an object of the present invention to achieve stabilization of clutch transmission torque at the point of half clutch completion during a garage shift upon vehicle start up, and to thereby achieve smooth clutch engagement. In a vehicle power transmission device in which a fluid coupling and a wet friction clutch are provided in series at points on a power transmission path which extends from an engine to a transmission, and which performs engagement/disengagement control of the clutch by varying the pressure of operating fluid used for engagement/disengagement driving the clutch in accordance with duty pulse signals outputted from an electronic control unit, clutch engagement control is begun at the same time as (t1) the transmission is put into gear in a state of clutch disengagement when a vehicle is about to start up from a standstill.

Abstract: In a process wherein a before-shifting gear ratio Gx changes to a gear ratio of the target gear position, an actual shift time is measured by regarding as a shift starting point an earlier one between a time point when the present gear ratio G has repeated decreasing by a value equal to or larger than a predetermined unit gear ratio &Dgr;G a predetermined number of times N and a time point when the present gear ratio reaches a first gear ratio G1 that is set to a value smaller than the gear ratio Gx by a predetermined value. If the gear ratio changes rapidly, the start of shifting can be detected at a time tsl when the present gear ratio G reaches the gear ratio G1, and if the gear ratio changes slowly, the start of shifting can be detected at a time ts4 when the gear ratio has repeated decreasing by a value equal to or larger than a predetermined unit gear ratio a predetermined number of times N.

Abstract: A method for controlling a transmission of a motor vehicle, especially of an automatic transmission or of an automated manual mechanical transmission. The transmission has hydraulically actuatable shifting elements which, during gear shifts, are engaged or disengaged via pressure curves (p_kzu, p_kab) stored in an electronic control unit. For one gear shift are carried out at least one adaptation of the pressure curves (p_kzu, p_kab) of the shifting elements for compensation of tolerances of components and alternative to this one adaptation for compensation of influences determinant of shifting quality for different shifting strategies and/or shifting kinds, the filling parameters of the engaging shifting elements being determined during the gear shift itself or by preset test pressure curves outside the gear shift.