A transmission includes an input shaft coupled to a prime mover, a countershaft, main shaft, and an output shaft, with gears between the countershaft and the main shaft. A shift actuator selectively couples the input shaft to the main shaft by rotatably coupling gears between the countershaft and the main shaft. The shift actuator is mounted on an exterior wall of a housing including the countershaft and the main shaft. An integrated actuator housing includes a single external power access for the shift actuator. A controller interprets a shaft displacement angle, determines if the transmission is in an imminent zero or zero torque region, and performs a transmission operation in response to the transmission in the imminent zero or zero torque region.

A hybrid vehicle includes an engine, an electric machine, a disconnect clutch configured to selectively couple the engine to the electric machine, and a controller. The controller is programmed to, in response to a request to start the engine with the electric machine, command a target pressure to the disconnect clutch that depends on a seal friction derived from a measured line pressure of the disconnect clutch and a rate change of the measured line pressure.

A vehicle control apparatus includes an overlapping-prediction determination portion configured to determine whether or not it is predicted that, during execution of a synchronous control for placing a clutch, which is provided between an engine and an electric motor, into an engaged state, a synchronization-completion time point of the clutch overlaps with an inertia phase period in process of a shift control of a transmission, and a torque limitation portion configured, when the overlapping-prediction determination portion determines that it is predicted that the synchronization-completion time point overlaps with the inertia phase period, to execute a torque limitation by which at least one of a torque capacity of the clutch and an output torque of the engine is made smaller than when the overlapping-prediction determination portion determines that it is not predicted that the synchronization-completion time point overlaps with the inertia phase period.

Methods and systems for a vehicle transmission are provided herein. The vehicle transmission includes an input interface configured to mechanically couple to a motive power source. The vehicle transmission further includes a first disconnect device releasably mechanically coupling a first output to a first drive axle and a second disconnect device releasably mechanically coupling a second output to a second drive axle.

A method of controlling an engine and a transmission of a hybrid vehicle includes steps of: determining whether the vehicle starts, determining an engine RPM and a gear stage of a transmission if the vehicle has started, determining whether the engine RPM has reached an engine speed control point, determining an engine target RPM and an engine target RPM slope of the vehicle when it is determined that the engine RPM has reached the engine speed control point, controlling the engine RPM of the vehicle to follow the engine target RPM and the engine target RPM slope, determining whether the engine RPM has slipped compared to the target engine RPM, and performing PID control to follow the engine target RPM if the engine RPM slips compared to the engine target RPM.

A method and system for shifting a transmission that includes one or more mechanical clutches without clutch plates is described. In one example, a torque output of an electric machine is adjusted in response to a request to shift a transmission so that forces that hold the mechanical clutch in an engaged position may be reduced.

Various embodiments include a method for controlling a motor vehicle having an internal combustion engine with a crankshaft and a drivetrain separable from the internal combustion engine using a releasable clutch comprising: propelling the vehicle in a first operating state in a predetermined range around a speed while the internal combustion engine is off and is separated from the drivetrain by the releasable clutch; sensing a braking operation while in the first operating state; predicting whether a power demand is expected within a predetermined time interval; and, if the power demand is expected, setting the crankshaft of the internal combustion engine in rotation, or increasing a rotational speed of the crankshaft in preparation for an engine restart.

A transmission includes an input shaft and an output shaft, the input shaft selectively accepting a torque input from a prime mover, and the output shaft selectively providing torque output to a driveline. A controller determines a shaft displacement angle representing an angle value of rotational displacement difference between at least two shafts of the transmission, and performs a transmission operation responsive to the shaft displacement angle.

A vehicle control apparatus includes an overlapping-prediction determination portion configured to determine whether or not it is predicted that, during execution of a synchronous control for placing a clutch, which is provided between an engine and an electric motor, into an engaged state, a synchronization-completion time point of the clutch overlaps with an inertia phase period in process of a shift control of a transmission, and a torque limitation portion configured, when the overlapping-prediction determination portion determines that it is predicted that the synchronization-completion time point overlaps with the inertia phase period, to execute a torque limitation by which at least one of a torque capacity of the clutch and an output torque of the engine is made smaller than when the overlapping-prediction determination portion determines that it is not predicted that the synchronization-completion time point overlaps with the inertia phase period.

A method, performed by a control device, for starting a combustion engine during free-wheeling with engine off is described. The method comprises a step of controlling the clutch to a partially closed state, thereby starting the combustion engine; a step of controlling the clutch to an open state when the combustion engine has started, but prior to the output shaft of the combustion engine has reached a rotational speed synchronized with the rotational speed of the input shaft of the gearbox; and a step of synchronizing the speed of the combustion engine to the speed of the input shaft of the gearbox through control of fuel injection to the combustion engine.