The drive system from the engine (1) to the drive wheels (7) of a vehicle is equipped with a torque converter (2), which has a lock-up clutch (3), and a variator (4). Said engined car is provided with a lock-up control means for controlling the engagement/disengagement of the lock-up clutch (3) and a gear change mode switch-controlling means (FIG. 8) for performing control to switch between a “continuously variable gear change mode” and a “DSTEP gear change mode.” While traveling, the gear change mode switch-controlling means (FIG. 8) prohibits gear change by the “DSTEP gear change mode” when the detected oil temperature is at or below a lock-up engagement-permitting threshold for permitting engagement of the lock-up clutch (3) and allows gear change by the “DSTEP gear change mode” when the detected oil temperature is higher than the lock-up engagement-permitting threshold.

A vehicle control system is provided to improve a response and an acceleration feel of a vehicle having a continuously variable transmission. The vehicle control system is configured to control an output power of a prime mover and a speed ratio of a transmission in such a manner that an actual driving force is increased stepwise to the required driving force to be achieved by a kick-downshifting so as to temporarily hold an increase in an acceleration during execution of the kick-downshifting.

A method of controlling a Continuously Variable Transmission (CVT) simulates a step-ratio transmission upshift. To simulate a step-ratio torque phase, the input torque is gradually reduced before beginning to change the variator ratio. Then, as the variator ratio is changed, the input torque is gradually increased to compensate for the decreasing torque ratio, simulating the relatively constant output torque of an inertia phase of a step-ratio upshift.

A vehicle control device executes driving force control to set a target driving force in accordance with an engine operating state, and control an output of a driving source and a gear ratio of a continuously variable transmission so that a target driving force is realized. The device includes a power generator which can be driven by the driving source, and in a normal shifting mode, the driving force control is corrected on the basis of a power generating state of the power generator, and in a linear shifting mode giving priority to a revolution speed change of the driving source, the correction of the driving force control is not carried out.

A gear shift control device for a continuously variable transmission of a vehicle is configured to steplessly and continuously change and output a rotation speed of an engine. The gear shift control device includes a gear shift control unit and a torque control command unit. The gear shift control unit is configured to implement a pseudo-stepped upshift control to change a gear shift ratio in steps when upshifting the continuously variable transmission. The torque control command unit is configured to output a torque reduction command so as to reduce an engine torque in conjunction with the pseudo-stepped upshift control so that reduction of the engine torque starts before a point in time when an actual gear shift ratio starts changing in response to an upshift command.

A vehicle in which a shift lever of a Shift-by-Wire (SBW) type is used, the vehicle may include an inputter configured to receive pressing force of an acceleration pedal of the vehicle, a shift command to a P-stage of the shift lever, and gradient information related to a road on which the vehicle drives; a controller configured to: when the pressing force of the acceleration pedal of the vehicle is generated and the shift command to the P-stage is input to the controller, determine a gradient load torque and an acceleration torque of the vehicle, and limit a driver's requested torque based on the determined gradient load torque and the determined acceleration torque; and a driving device connected to the controller and configured to shift the shift lever to the P-stage when the driver's requested torque is limited.

A vehicle in which a shift lever of a Shift-by-Wire (SBW) type is used, the vehicle may include an inputter configured to receive pressing force of an acceleration pedal of the vehicle, a shift command to a P-stage of the shift lever, and gradient information related to a road on which the vehicle drives; a controller configured to: when the pressing force of the acceleration pedal of the vehicle is generated and the shift command to the P-stage is input to the controller, determine a gradient load torque and an acceleration torque of the vehicle, and limit a driver's requested torque based on the determined gradient load torque and the determined acceleration torque; and a driving device connected to the controller and configured to shift the shift lever to the P-stage when the driver's requested torque is limited.

The control apparatus for a vehicle includes a determination unit that determines whether or not a start condition is established, the start condition including when a torque converter is in a lockup state, and when the vehicle is in an accelerating state; and a display control unit that causes an acting number of rotations to be displayed on a tachometer instead of an actual number of rotations when it is determined by the determination unit that the start condition is established. The display control unit calculates the acting number of rotations based on a target value of an input number of rotations of a continuously variable transmission, and varies the acting number of rotations with a rate of change having an absolute value that is greater than an absolute value of a rate of change of the actual number of rotations upon an abrupt change in the target value.

An automatic transmission includes: a transmission mechanism configured to shift rotation of a driving source and transmit the rotation to a driving wheel; and a clutch configured to control transmission of a torque from the driving source to the driving wheel, wherein when a change rate of a rotation speed of the driving source is equal to or higher than a predetermined change rate, a torque transmission capacity of the clutch is reduced.

[PROBLEMS] To reduce a sense of discomfort given to a driver due to vehicle deceleration caused by a downshift that is not intended by the driver, which is caused by a failure of a rotation speed sensor or the like. [SOLUTIONS] An automatic transmission includes: a transmission mechanism configured to shift rotation of a driving source and transmit the rotation to a driving wheel; and a clutch configured to control transmission of a torque from the driving source to the driving wheel, wherein when a change rate of a rotation speed of the driving source is equal to or higher than a predetermined change rate, a torque transmission capacity of the clutch is reduced.