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. A controller controls the shift actuator utilizing an actuating pulse and an opposing pulse.

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. A controller controls the shift actuator utilizing an actuating pulse and an opposing pulse.

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. A controller controls the shift actuator utilizing an actuating pulse and an opposing pulse.

A clutch torque estimating method for a transmission of a vehicle may include inputting model engine torque to a powertrain model by a controller; inputting target clutch torque of a first clutch and target clutch torque of a second clutch to the powertrain model by the controller; inputting shifting information related to the vehicle to the powertrain model by the controller; correcting the powertrain model in real time by feeding back an engine angular velocity error, a clutch angular velocity error of the first clutch, a clutch angular velocity error of the second clutch, a wheel angular velocity error to the powertrain model by the controller; and estimating clutch torque of the first clutch and clutch torque of the second clutch by determining the powertrain model by the controller.

A method for operating a hybrid drive train of a motor vehicle includes: starting the motor vehicle solely with the aid of an electric machine; engaging a torque converter lockup clutch for rotationally fixing an impeller of a torque converter to a turbine wheel of the torque converter, wherein the turbine wheel is rotationally fixed to the electric machine; and engaging a clutch in order to drivingly connect the impeller to a motor vehicle drive unit, in order to start the motor vehicle drive unit.

A method for calibrating a characteristic diagram for a drive-train of a working machine, which contains a brake pedal characteristic of a brake system and a clutch characteristic of a drive clutch, in which an opening point at which the drive clutch is disengaged when a brake pedal of the brake system is actuated as a function of a pedal path, and/or a closing point at which the drive clutch is engaged when the brake pedal is released as a function of the pedal path, is calibrated. When the brake pedal is actuated and/or released an actual rotational speed profile of the drive-train is determined, the actual rotational speed profile determined is compared with a stored corresponding target rotational speed profile, and the opening point and/or closing point of the drive clutch is adapted to minimize deviation of the actual rotational speed profile from the target rotational speed profile.

A clutch torque estimating method for a transmission of a vehicle may include inputting model engine torque to a powertrain model by a controller; inputting target clutch torque of a first clutch and target clutch torque of a second clutch to the powertrain model by the controller; inputting shifting information related to the vehicle to the powertrain model by the controller; correcting the powertrain model in real time by feeding back an engine angular velocity error, a clutch angular velocity error of the first clutch, a clutch angular velocity error of the second clutch, a wheel angular velocity error to the powertrain model by the controller; and estimating clutch torque of the first clutch and clutch torque of the second clutch by determining the powertrain model by the controller.

A method for operating a hybrid drive train of a motor vehicle (X) which has a combustion engine (VM), a transmission (G), an electric machine (EM), as well as a separation clutch (KO) positioned between the combustion engine (VM) and the electric machine (EM). During a purely electric drive operation in which the separation clutch (KO) is disengaged and, when a gear is selected in the transmission (G), and during expectation, reaching, or exceeding a rotational speed difference of the separation clutch (KO) is larger or equal to a limit value, and/or in an expectation, reaching, or exceeding a rotational speed limit of the electric machine (EM), the separation clutch (KO) is engaged. Further, an electronic control unit (ECU) executes the method and a motor vehicle (X) having such an electronic control unit (ECU).

A hybrid system includes a transmission control module, a power source, a transmission, and a drive train. The transmission control module partially operates the hybrid system and receives operating information from various components of the system, calculates power losses in the drive train, and calculates the driving torque needed to reach a target power profile determined from a driver's input.

Systems and methods for operating a vehicle that includes an engine that may be automatically stopped and started are described. In one example, a requested driver demand power may be filtered via a first order low pass filter in response to a powertrain speed. The filtered requested driver demand power may be a basis for automatically stopping and starting an engine.