摘要:
A hydraulic control device for generating a hydraulic pressure for a back pressure chamber of an accumulator in a speed stage shifting device of an automatic transmission for a vehicle such as an automobile is adapted to generate a hydraulic pressure to be supplied to the back pressure chamber of the accumulator by modulating the so-called line hydraulic pressure according to a balance between the modulated pressure itself and the line hydraulic pressure or more desirably an engine power simulation pressure modulated from the line hydraulic pressure to be lower than the line hydraulic pressure in low engine output operation under an influence of a signal hydraulic pressure controlled by an electromagnetic valve, wherein the signal hydraulic pressure decreases to substantially zero when the electromagnetic valve fails, and the accumulator control valve has a spool element having a first pressure receiving area exposed to the modulated hydraulic pressure to generate a positive feedback effect of decreasing the modulated hydraulic pressure along with increase thereof and a second pressure receiving area so that the accumulator control valve variably operates even when the signal pressure has decreased to zero exposed to the line hydraulic pressure or the engine power simulation pressure to generate an effect of increasing the modulated pressure, the first pressure receiving area having an effective pressure responsive sectional area substantially equal in the magnitude and opposite in the orientation to that of the second pressure receiving area.
摘要:
A hydraulic control device having a reverse inhibition system and applicable to an automatic transmission for a vehicle of a type including a friction engaging means for a reverse stage having a reverse exclusive hydraulic pressure chamber adapted to be supplied with a hydraulic pressure only for setting up the reverse stage, the reverse inhibition system having a reverse inhibition valve biased to a reverse inhibition position by a control hydraulic pressure for interrupting supply of hydraulic pressure to the reverse exclusive hydraulic pressure chamber and to a reverse allowance position by a hold hydraulic pressure for allowing the supply of hydraulic pressure to the reverse exclusive hydraulic pressure chamber, wherein the hydraulic pressure supplied to the reverse exclusive hydraulic pressure chamber is used for the hold hydraulic pressure.
摘要:
A hydraulic control apparatus for controlling a frictional coupling device of an automatic transmission for a motor vehicle includes a shift valve for effecting an engaging action of the coupling device from a first position to a second position, and an accumulator for reducing a change in a hydraulic pressure applied to the coupling device. The control apparatus is adapted to control a control value to regulate a back pressure of the accumulator, based on a parameter associated with an output of an engine, and according to a predetermined relationship between the control value and the parameter, so as to reduce a shifting shock of the transmission. The control apparatus includes a detector for detecting an engaging time of the engaging action of the coupling device. The control apparatus further includes a compensating device for updating the relationship between the control value and the parameter, depending upon the detected engaging time, with respect to a specific value of the parameter at which the engaging action takes place. The compensating device maintains the updated relationship for use for a subsequent engaging action of the coupling device from the first position to the second position.
摘要:
An apparatus for controlling A continuously variable transmission for use in an automotive vehicle, such that an actual engine speed coincides with a desired engine speed, wherein the desired engine speed in a transient state of the vehicle with an accelerator pedal being operated is determined based at least on a rate at which the accelerator pedal is operated.
摘要:
In a continuously variable transmission (CVT), the desired engine speed is defined as a function of the throttle position. The speed ratio of the CVT is controlled such that the actual engine speed reaches the desired engine speed. The desired engine speed is set to B (Nos-Nos') upon the abrupt change in the throttle position, where B is a positive value less than 1, Nos is a desired steady-state engine speed after the change and Nos' is a desired steady-state engine speed before the change. Thereafter the desired engine speed approaches gradually the desired steady-state engine speed corresponding to the present throttle position. In the present invention the values of B in acceleration and deceleration of a vehicle are defined different from each other.
摘要:
A method of controlling a power transmitting system for an automotive vehicle, having a continuously variable transmission and an auxiliary transmission which is connected with the continuously variable transmission, and which has at least two shift positions for forward driving of the vehicle. The auxiliary transmission is automatically shifted from one of the shift positions to another, based on a detected speed, a detected currently required output of the vehicle, and a detected speed ratio of the continuously variable transmission. Alternatively, the auxiliary transmission is shifted from one of the shift positions to another in response to an operation of a manual shift lever. When a predetermined condition is satisfied after the shift lever is operated to a given position, the auxiliary transmission is permitted to be shifted to the shift position corresponding to the position of the shift lever. This condition is determined based on the detected speed, the currently required output of the vehicle, and the detected speed ratio of the continuously variable transmission. Also disclosed are devices suitable for practicing the methods.
摘要:
For an automatic transmission for a vehicle including a speed stage shifting device such as shown in FIG. 1 in which the clutch C.sub.1 is adapted to be engaged when the 2nd speed stage and the 3rd speed stage are set up and disengaged when the 4th speed stage is set up, the engagement of the clutch C.sub.1 being essential for setting up the 2nd speed stage while the engagement of the clutch C.sub.1 is not essential for setting up the 3rd speed stage unless engine brake availability is required, a hydraulic control device includes a first passage 235 and a second passage 329 for supplying a hydraulic pressure to the clutch C.sub.1 in parallel with one another, the first passage having a substantially less fluid flow resistance than the second passage, and a fluid flow switching over mechanism including a 1-2 shift valve 210 and a C.sub.1 control valve 300 for alternatively communicating the first or the second passage while interrupting the second or the first passage according to whether the 2nd speed stage or the 3rd speed stage is set up. An accumulator 450 may be provided in the second passage 329. Further, a one way val e 469, or more desirably a parallel connection of the one way valve 469 and an orifice 467 may be provided between the accumulator and the clutch C.sub.1.
摘要:
In an automatic transmission for a vehicle such as an automobile having a speed stage shifting mechanism including parallelly arranged first and second hydraulically operated input clutches and adapted to provide the 3rd speed stage in which the first and second input clutches C.sub.1 and C.sub.2 are both engaged (though the engagement of the clutch C.sub.1 in the 3rd speed stage is not essential unless engine brake availability is required) and the overdrive 4th stage in which the clutch C.sub.1 is disengaged and the clutch C.sub.2 is engaged, the clutch C.sub.1 in the 3rd speed stage being not essential unless engine a hydraulic control device has a switching over valve 330 for switching over supply of a hydraulic pressure to the first clutch C.sub.1 between a first mode of relatively slowing supplying the hydraulic pressure to the first clutch C.sub.1 and a second mode of relatively quickly supplying the hydraulic pressure to the first clutch C.sub.1 according to engine output power so as to select the second mode when engine output power is higher than a determinate power level as in the downshifting by kickdown and to select the first mode when engine output power is less than the determinate power level as in the overdrive inhibition.
摘要:
A continuously variable transmission (CVT) for use in a vehicle is controlled such that an actual engine speed Ne is equalized to a desired engine speed No. When a driver's request for a rapid speed change of the vehicle is addressed, a desired engine speed Ns for steady state or the desired engine speed No before the request is detected is defined as a first value Nc1. While the request continues the desired engine speed Ns for steady state which is determined by current values of vehicle running parameters is defined as a second value Nc2. The product B.multidot.(Nc2-Nc1) of a constant B and Nc2 minus Nc1 is calculated and defined as a desired engine speed during the request.
摘要:
In an automatic transmission for a vehicle such as an automobile having a speed stage shifting mechanism including parallelly arranged first and second input clutches C1, C2 and adapted to selectively engage the first and second input clutches in three ways of engaging the first input clutch C1 with the second input clutch C2 being disengaged to provide a certain first speed stage (2nd speed stage), engaging the second input clutch C2 with the first clutch C1 being disengaged to provide a certain second speed stage (4th speed stage) and engaging both the first and second clutches C1, C2 to provide a certain third speed stage (3rd speed stage), a hydraulic control device has a first valve (3-4 shift valve) for switching over connection of the first input clutch C1 with a hydraulic pressure supply 274 and a drain 280, a second valve (2-3 shift valve) for exchanging connection of the second input clutch C2 and a fail safe port 260 with a hydraulic pressure supply 246 and a drain 252, 253, and a passage 268 for connecting the drain for the first valve with the fail safe port 260 of the second valve so that at least one of the first and second input clutch is supplied with hydraulic pressure regardless of sticking of the first and/or the second valve.