A shift control method of a vehicle with a dual clutch transmission (DCT) may include: a first preparing step of, by a controller, controlling a torque of an N-th stage clutch to a predetermined minimum torque and increasing a torque of an N1-th stage clutch to a predetermined standby torque; a first handover step of releasing the torque of the N-th stage clutch and increasing the torque of the N1-th stage clutch; a gear changing step of releasing an N-th stage gear and then initiating an engagement of an N2-th stage gear; a synchronization maintaining step of maintaining a synchronized state by adjusting the torque of the N1-th stage clutch; a second preparing step of increasing the torque of the N2-th stage clutch to the standby torque; and a second handover step of releasing the torque of the N1-th clutch and increasing the torque of the N2-th stage clutch.

An engine is driven at an operating point with high engine efficiency to improve fuel economy. A vehicle control device according to the present invention controls a transmission ratio before increasing the engine rotation speed, and thereafter, engages the clutch.

A method for determining and controlling engine speeds of a work vehicle during gear shifts may include controlling an operation of an engine and/or a transmission of a work vehicle so as to maintain the work vehicle operating at a requested speed, and determining a measured gear ratio for the transmission as a gear shift is occurring from a first gear ratio to a second gear ratio. The method may also include calculating a desired engine speed during the gear shift as a function of the requested speed and either the measured gear ratio or the second gear ratio. In addition, when the measured gear ratio differs from the first gear ratio by a predetermined threshold amount, the method may include controlling the engine speed based on the desired engine speed for a remainder of the gear shift from the first gear ratio to the second gear ratio.

A shifting control method for a vehicle with a dual clutch transmission (DCT), the shifting control method may include controlling engine torque to be increased according to reserve demand torque by giving the reserve demand torque of an engine to be increased to a predetermined value or more when if a controller determines that the vehicle enters a manual power off and downshift shifting; controlling, by the controller, a release side clutch to be released; controlling, by the controller, an engine torque to perform a control so that engine speed follows coupling side input shaft speed; and completing the shifting by performing a control so that a coupling side clutch is coupled when it is determined that the actual shift is completed.

A control device that controls a vehicle drive device in which an engagement device, a rotating electrical machine, and an automatic transmission are arranged in this order from an input side on a power transmission path connecting an input drivingly coupled to an internal combustion engine and an output drivingly coupled to a wheel, the control device including: an electronic control unit configured to operate when starting of the internal combustion engine and downshifting are performed in parallel in a state in which the internal combustion engine is stopped and the engagement device is disengaged so that torque of the rotating electrical machine is transmitted to the wheel.

A vehicle powertrain includes a propulsion unit having a propulsion unit auxiliary brake, a transmission, driven wheels and a control unit arranged to control at least the transmission, where the propulsion unit is drivingly connected to the driven wheels via a clutch and different engagable gear ratios in the transmission. The control unit is arranged to perform the following steps when upshifting: automatically disengage the clutch in order to disengage the propulsion unit from the transmission; upshift the transmission to a new gear compared to current gear; initiate a synchronization in order to decrease and synchronize rotational speed of the propulsion unit to rotational speed of the new gear to be engaged; if it is determined by the control unit that the synchronization cannot be performed by decreasing rotational speed of the propulsion unit by the control unit controlling the auxiliary brake to brake the rotational speed of the propulsion unit then, automatically initiate a reengagement of the clutch in order to perform the synchronization. A corresponding method, a computer program, a computer readable medium, and a control unit for controlling the powertrain are also provided.

A motor vehicle is disclosed having an engine driving a multi-speed gearbox via a friction clutch. The engine is arranged to drive a number of electrically controllable loads the level of load applied by each of which to the engine is controlled by an electronic controller in response to a number of inputs. When the inputs indicate that an upshift of the gearbox is to take place the electronic controller is arranged to increase the loads applied by the electrically controllable loads to the engine and when the inputs indicate that a downshift of the gearbox is to take place the electronic controller is arranged to decrease the loads applied by the electrically controllable loads to the engine thereby improving the quality of the gear change irrespective of whether it is an upshift or a downshift.

A shifting control method for a vehicle with a dual clutch transmission (DCT), the shifting control method may include controlling engine torque to be increased according to reserve demand torque by giving the reserve demand torque of an engine to be increased to a predetermined value or more when if a controller determines that the vehicle enters a manual power off and downshift shifting; controlling, by the controller, a release side clutch to be released; controlling, by the controller, an engine torque to perform a control so that engine speed follows coupling side input shaft speed; and completing the shifting by performing a control so that a coupling side clutch is coupled when it is determined that the actual shift is completed.

A gear selection recommendation can be displayed in a vehicle having a transmission to be actuated manually. The gear selection recommendation can be calculated based on a present deceleration setpoint value to be ascertained by a control unit. A gear suitable for generating an engine braking force corresponding to the present deceleration setpoint value is calculated and the calculated gear is displayed as the gear selection recommendation on a display unit included in the vehicle.

A shift change practice device capable of improving the effect of learning a shift change operation is provided. The shift change practice device includes: an optimum speed calculation unit that calculates an optimum value or an optimum range of an engine revolution speed in the event of a shift change; a revolution speed comparison unit that determines whether or not a detected revolution speed that is a detected value of the engine revolution speed is equal to the optimum value or whether or not the detected revolution speed is included in the optimum range, in a state where a clutch is disconnected; and a notification instruction unit that instructs a notification device to give a predetermined notification to a driver when the detected revolution speed is equal to the optimum value or the detected revolution speed is included in the optimum range, in the state where the clutch is disconnected.