A method for operating a dual-clutch transmission of a motor vehicle, wherein a first clutch is operated closed or engaged and in this way a first transmission branch is driven, in which a current actual gear is engaged, and in a pre-selection phase for a gear changed to a desired gear in a second transmission branch, the desired gear is engaged, and in a second clutch, a clutch hydraulic system is filled and, in this way, the second clutch is closed. The gear change shall be made faster. The filling of the clutch hydraulic system is begun already during the pre-selection phase, and, in this case, the clutch hydraulic system is filled in the pre-selection phase but at most up to reaching a touch point of the second clutch.

A control system for a work vehicle includes a power source including an engine and at least one electric motor configured to generate power; a transmission including a plurality of clutches coupled together and configured for selective engagement to transfer the power from the engine and the at least one electric motor along a power flow path to drive an output shaft of a powertrain according to a plurality of transmission modes; and a controller coupled to the power source and the transmission. The controller has a processor and memory architecture configured to: monitor an electric motor speed of the at least one electric motor; and generate and execute, when the electric motor speed is less than a first predetermined stall speed threshold, a clutch modulation command for the transmission such that at least one clutch of the plurality of clutches along the power flow path is partially engaged.

A hybrid electric vehicle (HEV) includes an engine, a first motor directly connected to the engine through a first shaft, a second motor directly connected to a second shaft, and an engine clutch of which one end is connected to the first shaft and the other end is connected to the second shaft so as to selectively connect the first shaft and the second shaft. The (HEV) includes a first controller unit configured to control each of the first motor and the second motor and a second controller unit configured to determine whether a preconfigured touch point learning condition is satisfied, control the first and second motors to respective first and second speeds when the learning condition is satisfied, and learn a touch point of the engine clutch on the basis of a torque change of the first motor or the second motor.

Clutch temperature management in a slip control method and arrangement for a drivetrain including a continuously variable transmission is described herein. The drivetrain includes a clutch that is so controlled as to slip when a torque higher than the usable torque attempts to pass through. The temperature data from the clutch is used to determine the usable torque. Accordingly, the clutch prevents the prime mover from stalling.

A control system for a work vehicle includes a power source including an engine and at least one electric motor configured to generate power; a transmission including a plurality of clutches coupled together and configured for selective engagement to transfer the power from the engine and the at least one electric motor along a power flow path to drive an output shaft of a powertrain according to a plurality of transmission modes; and a controller coupled to the power source and the transmission. The controller has a processor and memory architecture configured to: monitor an electric motor speed of the at least one electric motor; and generate and execute, when the electric motor speed is less than a first predetermined stall speed threshold, a clutch modulation command for the transmission such that at least one clutch of the plurality of clutches along the power flow path is partially engaged.

A mean rate decision method for a clutch motor is disclosed. The method includes determining whether the clutch motor and a gear sensor are in an electrical failure state; when it is determined the clutch motor and the gear sensor are not in the electrical failure state, determining whether there is a driver's starting intention on the basis of state information on the clutch pedal; setting a target position of the clutch motor according to a pedal setting value set by the clutch pedal; and when it is determined that there is no driver's starting intention and that an actual position of the clutch motor exceeds the target position of the clutch motor, determining a failure of the clutch motor on the basis of an excess movement amount and an excess duration in the excess state.

A method for operating a dual-clutch transmission of a motor vehicle, wherein a first clutch is operated closed or engaged and in this way a first transmission branch is driven, in which a current actual gear is engaged, and in a pre-selection phase for a gear changed to a desired gear in a second transmission branch, the desired gear is engaged, and in a second clutch, a clutch hydraulic system is filled and, in this way, the second clutch is closed. The gear change shall be made faster. The filling of the clutch hydraulic system is begun already during the pre-selection phase, and, in this case, the clutch hydraulic system is filled in the pre-selection phase but at most up to reaching a touch point of the second clutch.

A mean rate decision method for a clutch motor is disclosed. The method includes determining whether the clutch motor and a gear sensor are in an electrical failure state; when it is determined the clutch motor and the gear sensor are not in the electrical failure state, determining whether there is a driver's starting intention on the basis of state information on the clutch pedal; setting a target position of the clutch motor according to a pedal setting value set by the clutch pedal; and when it is determined that there is no driver's starting intention and that an actual position of the clutch motor exceeds the target position of the clutch motor, determining a failure of the clutch motor on the basis of an excess movement amount and an excess duration in the excess state.

A method to control the execution of a shift to a higher gear with a released accelerator pedal in a drivetrain provided with a dual-clutch, servo-assisted transmission, comprising the steps of: opening, in a first instant, an outgoing clutch; closing, in the first instant, an incoming clutch; synchronizing, between a second instant and a third instant, a rotation speed of the internal combustion engine with a rotation speed of the incoming clutch, namely with the rotation speed imposed by the gear ratio of the following gear; completely opening, in the third instant, the outgoing clutch; completely closing, in the third instant, the incoming clutch; keeping the torque transmitted by the outgoing clutch constant between the second instant and a fourth instant; and keeping the torque transmitted by the incoming clutch constant between the second instant and the fourth instant.

A method is described for calibrating a characteristic diagram of a working machine. The characteristic diagram includes a brake pedal characteristic of a brake system and at least one clutch characteristic of a drive input clutch which, in the calibrated condition, have a nominal relationship to one another. The method having the steps of: determining a wheel-side drive output torque; determining an actual brake pedal characteristic with reference to the drive output torque; determining an actual relationship that differs from the nominal relationship by comparing the actual brake pedal characteristic with a nominal brake pedal characteristic; and calibrating the brake pedal characteristic or the clutch characteristic in such manner that the actual relationship corresponds to the nominal relationship. In addition a working machine with a control unit for carrying out the method is described.