In a control apparatus for a vehicle, when it is not determined that a downshift to a second gear stage should be carried out and an accelerator depression amount change rate is equal to or smaller than a predetermined value when it is determined that a downshift to a first gear stage should be carried out, a single downshift command to the first gear stage is output. When it is not determined that the downshift to the second gear stage should be carried out and the accelerator depression amount change rate is larger than the predetermined value when it is determined that the downshift to the first gear stage should be carried out, a current gear stage is maintained. Therefore, a skip downshift to the second gear stage can be carried out when it is determined that the downshift to the second gear stage should be carried out.

A multi-speed automatic vehicle transmission has an electronic control unit which permits multiple downshifts if certain conditions are satisfied. Such downshifts are direct and omit engagement and disengagement of one or more intermediate speed ratios. Multiple downshifting may allow the actual speed ratio to better match the ideal speed ratio, for example under heavy braking.

A method is provided for controlling a multi-clutch transmission of a vehicle, wherein the clutch transmission is adapted to be shifted either with a power shift or a power cut shift dependent on predetermined vehicle variables. The method includes detecting a power shift to a higher gear in low range gear, wherein if power shift to a higher gear in low range gear has been detected the method overrules the previously set gear shift strategy and controls the multi-clutch transmission such that a forthcoming gear shift is performed as a power shift.

A motor vehicle having a drive unit, the power output shaft of which outputs alternately to a first sub-transmission or a second sub-transmission of a dual clutch transmission by way of two separating clutches of a dual clutch. The first sub-transmission has the odd-numbered forward gears and the second sub-transmission has the even-numbered forward gears, and having a transmission control device, which has a driving strategy unit for determining a target gear as a function of input parameters and a shift sequence control unit, with which a gear change from the current gear to the target gear can be controlled.

When there is a request for a skip downshift that transitionally establishes an intermediate speed position, a surge hydraulic pressure at the start of a torque phase during shift control toward the intermediate speed position is set so as to be lower than a surge hydraulic pressure at the start of a torque phase during shift control toward a required speed position.

In a controller for an automatic transmission, when a jump gear shift via a plurality of intermediate shift stages is executed, a first and a second target intermediate shift stages are extracted, and a target input shaft rotation speed change rate is calculated from a difference in synchronous rotation speed between a shift stage before a current gear shift and the second target intermediate shift stage as a target shift stage of a gear shift which is executed after the current gear shift. Accordingly, it is possible to avoid a situation in which a shifting time in the gear shift control of the step before the second target intermediate shift stage becomes very short and thus packing of a clutch pack is not executed in a timely manner.

When a power-on downshift via an intermediate shift stage accompanied by input switching control is required and a predetermined shift stage is a shift stage lower than the intermediate shift stage, an electronic control unit performs torque phase control in a torque phase control time shorter than the torque phase control time that is set when the predetermined shift stage is a shift stage higher than the intermediate shift stage. Accordingly, it is possible to complete disengagement of a disengagement-side element early and to suppress a rapid increase of an input shaft rotation speed due to a clutch torque remaining.

When a jump downshift via an intermediate shift stage is requested and a rotation speed of an input shaft approaches a synchronous rotation speed of the intermediate shift stage, a target torque phase time when the gear shift via the intermediate shift stage is performed with input switching is set to be shorter than that when the gear shift via the intermediate shift stage is performed without using input switching and torque phase control is performed. Accordingly, it is possible to promptly perform engagement of an engagement-side frictional engagement element at the time of passing through the intermediate shift stage and to rapidly perform the gear shift after passing through the intermediate shift stage.

A shift control method and system for a hybrid vehicle are provided to increase the recovery rate of regenerative energy, improve the fuel efficiency, and minimize the loss of the fuel efficiency upon reaccelerating after braking. The method include: acquiring in real-time information regarding a transmission input speed during driving and sensing a brake pedal operation. In addition, whether a road driving situation or a driver tendency corresponds to a skip shift allowable condition is detected when the brake pedal operation is sensed. A target shift stage to which a skip shift of two or more stages is performed is selected from a current shift stage based on the transmission input speed in real-time, when the road driving situation or the driver tendency corresponds to the skip shift allowable condition. Then a transmission is operated to shift to the selected target shift stage.

A control apparatus of an automatic transmission includes an electric hydraulic pump including a motor and a pump, an actuator for engaging or releasing a friction element by controlling a hydraulic pressure discharged from the pump, and a transmission control unit (TCU) for correcting a control signal to control the actuator depending on a dynamic characteristic coefficient of the friction element and the actuator during shifting when outputting the control signal to the actuator.