摘要:
A control device of a continuously variable transmission for a vehicle to which power of a drive force source is input through a transmission path connecting/disconnecting device changes a gear ratio of the continuously variable transmission to a lower vehicle speed side during vehicle deceleration when the transmission path connecting/disconnecting device is in a power transmission interrupted state of interrupting power transmission through a power transmission path between the drive force source and the continuously variable transmission, earlier as compared to when the transmission path connecting/disconnecting device is in a power transmittable state enabling the power transmission, and the control device changes a gear ratio of the continuously variable transmission earlier to the lower vehicle speed side when vehicle deceleration is larger, when the transmission path connecting/disconnecting device is in the power transmission interrupted state.
摘要:
A control device of a continuously variable transmission for a vehicle having a pair of variable pulleys with variable effective diameters of an input-side variable pulley and an output-side variable pulley and a transmission belt wound around between the pair of the variable pulleys, the continuously variable transmission respectively controlling an input-side thrust force in the input-side variable pulley and an output-side thrust force in the output-side variable pulley to set an actual gear ratio to a target gear ratio while preventing a slip of the transmission belt, the continuously variable transmission includes: a hydraulic control circuit capable of accurately controlling one of the input-side variable pulley and the output-side variable pulley in terms of thrust force as compared to the other, in the case that a target thrust force on the one side for assuring belt slip prevention of the both pulleys on the one side is set, based on a target thrust force on the one side, a target thrust force on the other side for achieving a target gear ratio on the other side being set, and a larger one being selected as the target thrust force on the one side out of a limit thrust force to a slip on the one side required for belt slip prevention on the one side, and a thrust force on the one side required for achieving a target gear ratio on the one side calculated based on a limit thrust force to a slip on the other side required for belt slip prevention on the other side.
摘要:
In a shift control device and a shift control method of an automatic transmission that establishes a plurality of gear steps of different speed change ratios by selectively engaging a plurality of friction engagement devices, one of a shift start time point and an inertia phase start time point is used as a reference time. In a power-off shift, the shift action is compulsorily ended when the elapsed time from the reference time exceeds a first time. In a power-on shift, the shift action is compulsorily ended when the elapsed time from the reference time exceeds a second time that is set shorter than the first time. If a switch from the power-off shift to the power-on shift occurs halfway through the power-off shift, the shift action is compulsorily ended when the elapsed time from the time point of the switch exceeds a predetermined time.
摘要:
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.
摘要:
An apparatus for controlling a vehicle automatic transmission having a hydraulically operated frictional coupling device operable to effect a shifting action of the automatic transmission, and an accumulator connected to the frictional coupling device, the apparatus including an accumulator-back-pressure learning compensation device operable to effect learning compensation of a back pressure of the accumulator such that an actual value of a rate of change of a rotating speed of a selected rotary element of the automatic transmission, which rotating speed changes as a result of the shifting action, approaches a predetermined target value, and an accumulator-back-pressure control device operable to control the back pressure, on the basis of an output of the accumulator-back-pressure leaning compensation device, whereby a shifting shock of the transmission can be reduced.
摘要:
A control device of a continuously variable transmission for a vehicle has a pair of variable pulleys and a transmission belt, and the control device respectively controls input-side and output-side thrust forces of input-side and output-side variable pulleys to set an actual gear ratio to a target gear ratio, prevents a slip of the transmission belt, and determines a lowest-speed-side gear ratio. When it is determined that a detection value of a rotation speed for calculating the actual gear ratio does not reflect an actual rotation speed, target input-side and output-side thrust forces are set to be target thrust forces for maintaining the lowest-speed-side gear ratio and preventing the slip of the transmission belt, and based on whether the actual gear ratio is already the lowest-speed-side gear ratio, values of the input-side and output-side thrust forces are changed for obtaining the target thrust forces.
摘要:
An ECU executes the program including the step acquiring a catalyst temperature when the execution condition for fuel-cut control is satisfied; the step selecting a throttle opening degree based on the catalyst temperature; the step executing fuel-cut control; and the step executing return control from fuel-cut control when the condition for returning from fuel-cut control is satisfied.
摘要:
A transmission ECU 12 determines whether or not the conditions for executing a neutral control operation are satisfied (step S11), and measures hydraulic oil temperature if it determines that the execution conditions are satisfied (step S12). Then, the transmission ECU 12 sets a target speed ratio for a torque converter 3 corresponding to the measured hydraulic oil temperature (step S13), and performs a neutral control operation to bring the speed ratio of the torque converter 3 equal to the target speed ratio (step S14).
摘要:
In a shift control device and a shift control method of a vehicular automatic transmission that performs a coast downshift by engagement switch between a release-side engagement element and an element-side engagement element at a time of deceleration of a vehicle, it is determined whether or not there is a driver's intention to decelerate the vehicle during the coast downshift. If an affirmative determination is made regarding the intention to decelerate the vehicle, the rise of engagement pressure of the engagement-side engagement element is stopped so as to cause the coast downshift not to progress. If a negative determination is made regarding the intention to decelerate the vehicle while the rise of the engagement pressure has been stopped, the engagement pressure of the engagement-side engagement element is raised again so as to cause the coast downshift to progress.
摘要:
An ECT_ECU of the present invention executes a program including the step of setting a determination time T for determining the completion of an upshift in an accelerator off mode to a short determination time T (X) when a slip value NS (NS=NE−NT) between an engine revolution NE and a turbine revolution NT is smaller than a predetermined slip value NS (0) (when the difference between NT and NE is large, and the step of setting the determination time T to a long determination time T (Y) when the slip value NS (NS=NE−NT) is larger than the predetermined slip value NS (0) (when the difference between NT and NE is small).