A method of controlling a hybrid power train may include: driving a first input shaft connected to a second motor-generator by the second motor-generator to synchronize a speed of a driven gear of a target gear position with a speed of an output shaft; moving a sleeve to directly connect the second input shaft, the output shaft, and the driven gear of the target gear position; decreasing torque of the first motor-generator and increasing torque of the second motor-generator to converge torque transferred from the second motor-generator to the output shaft, to torque of the output shaft; moving the sleeve to release the second input shaft and maintain only the output shaft and the driven gear; and increasing torque of an engine and decreasing the torque of the second motor-generator to converge torque transferred from the engine to the output shaft, to the torque of the output shaft.

A method for controlling a valve to disengage a gear in a transmission. The method includes reducing, after receiving a request to disengage the gear, a current supplied to the valve from a starting to a first current. The method further includes counting a first elapsed time since the valve was reduced to the first current, comparing the first elapsed time to a first wait time, and increasing the current supplied to the valve to a second current once the first elapsed time exceeds the first wait time. The method further includes counting a second elapsed time since the valve was increased to the second current, comparing the second elapsed time to a second wait time, and reducing the current supplied to the valve to a third current once the second elapsed exceeds the second wait time. The valve is closed when the current is the third current.

Methods and system are described for changing a driveline gear range from a lower gear range to a higher gear range. The driveline may include two electric machines and four clutches in a four wheel drive configuration. The methods and systems permit a driveline to change from a lower gear range to a higher gear range in a way that may reduce torque disturbances that may result from gear lash.

An ECU determines whether or not a road surface changes from a low μ road surface to a high μ road surface based on image data obtained by a camera sense. When the ECU determines that the accelerator pedal operation amount deceases greatly in a predetermined determination period from a time point at which a drive wheel slip state occurs in a case where the ECU determines that the road surface changes from the low μ road surface to the high μ road surface, it prohibits upshift operation of an automatic transmission over a predetermined period from that time point.

Methods and system are described for changing a driveline gear range from a higher gear range to a lower gear range. The driveline may include two electric machines and four clutches in a four wheel drive configuration. The methods and systems permit a driveline to change from a higher gear range to a lower gear range without stopping a vehicle.

A CPU sets a gear ratio, which is an action, on the basis of an accelerator operation amount, a vehicle speed, a gradient, a curvature, and a current gear ratio, until a predetermined amount of time elapses. The CPU operates a transmission in accordance with the set gear ratio and obtains a rotation speed NE of a crankshaft at that time. When the predetermined amount of time has elapsed, the CPU updates an action value function by providing a reward in accordance with whether the number of times of switching the rotation speed NE or the gear ratio meets a standard.

There is proposed a gearshift control device which can reduce a transmission load due to preshift, and improve fuel efficiency of a vehicle. A gearshift control device which controls a transmission 50 including two systems of power transmission mechanisms, and preshifts the transmission 50 based on a traveling plan during automatic driving of a vehicle. The gearshift control device makes automatic driving preshift execution decision of planning control contents of the transmission 50 based on the traveling plan, and preshift execution decision of deciding whether or not to preshift the transmission based on a control plan of the transmission 50.

A method to control the execution of a shift to a lower gear with a released accelerator pedal in a drivetrain provided with a dual-clutch, servo-assisted transmission; the following steps ate provided: opening, in a first instant, an outgoing clutch; closing, in the first instant, an incoming clutch; completing the opening of the outgoing clutch by means of a first linear ramp in a second instant; synchronizing, between the second instant and a third instant, a rotation speed of the internal combustion engine with a rotation speed of the incoming clutch; closing of the incoming clutch by means of a second linear ramp starting from a fourth instant, which is prior to or coincides with the second instant; completing the closing of the incoming clutch in a fifth instant, which coincides with or is subsequent to the second instant; and activating the internal combustion engine so as to generate a torque between the fourth instant and the third instant.

The invention relates to a drive arrangement for a vehicle and a method for gear shifting in a vehicle. The drive arrangement (5) comprises at least a first drive axle (10, 20, 30) operatively connected to a first gear box (11) and a first propulsion unit (12). The drive arrangement (5) further comprises a second gear box (21) and a second propulsion unit (22) operatively connected to the first drive axle (10) or to an optional second drive axle (20, 30). The drive arrangement (5) further comprises at least one electronic control unit (ECU) adapted to govern gear transmission of the first and the second gear boxes (11, 21). The electronic control unit (ECU) is configured to automatically select between shifting gear on the first and the second gear boxes (11, 21) simultaneously, or sequentially. The drive arrangement and the method provides for a very versatile drive arrangement and gear synchronization providing comfort for the driver and the passengers as well as improved vehicle dynamics.

An apparatus and method for controlling a transmission of a vehicle, may include a determination device that determines whether a curve is present within a predetermined distance ahead of the vehicle, based on information regarding a road ahead of the vehicle, a calculation device that determines lateral acceleration of the vehicle based on information regarding the curve and information regarding a state of the vehicle and determines a pattern correction coefficient based on the predicted lateral acceleration, a pattern correction device that corrects a preset gear-shift pattern based on the pattern correction coefficient, and a controller that is configured to control the transmission based on the corrected gear-shift pattern when the vehicle enters the curve.