Provided is a transmission control system that enables more precise control of the transmission ratio. This transmission control system is provided with a motor, an actuator, a transmission, a position sensor, a current sensor, and a control unit. The control unit includes: a drive unit that drives the motor while the vehicle is stopped; and a first estimation unit that estimates the initial transmission ratio, which indicates the transmission ratio when the ignition switch is turned on, on the basis of a rotation position detected by the position sensor, a load current detected by the current sensor, and a characteristic curve over a period during which the drive unit is operating.

In order to control the disengagement limit position of a movable dog relative to a fixed dog of a motor vehicle transmission, the following steps are implemented: acquiring position values of the movable dog; detecting an abutment position of the movable dog against the fixed dog for a predefined period; and calculating the limit position from the position value of the movable dog in abutment against the fixed dog.

A method for the dynamically expanding play correction according to a method for hysteresis compensation for an actuator and for a shift fork which is movable by this actuator via an electric motor having a rotor and a stator and which guides a gearshift sleeve, by means of a cellular automaton, wherein a torque ripple of the actuator and a mechanical displacement of the gearshift sleeve are compensated independently of one another or in combination by means of a learning algorithm.

Provided is a transmission control system that enables more precise control of the transmission ratio. This transmission control system is provided with a motor, an actuator, a transmission, a position sensor, a current sensor, and a control unit. The control unit includes: a drive unit that drives the motor while the vehicle is stopped; and a first estimation unit that estimates the initial transmission ratio, which indicates the transmission ratio when the ignition switch is turned on, on the basis of a rotation position detected by the position sensor, a load current detected by the current sensor, and a characteristic curve over a period during which the drive unit is operating.

The remotely tunable CVT is an apparatus that comprises a continuously variable transmission, in which an actual speed ratio is feedback-controlled to a target speed ratio, in addition to a communications system configured to enable wireless communication with an external computer, and a control system configured to allow the target speed ratio to be controlled via the aforementioned external device. A corresponding method is also disclosed.

A continuous variable planetary (CVP) system includes a CVP hub, which includes a shift mechanism including a shift driver element, and a processing server system to calibrate the CVP system and detect errors within the CVP system. The processing server system performs continuously monitoring or obtaining a transmission speed ratio of the CVP hub. Upon detecting that the transmission speed ratio reaches a particular value, the processing server system records a corresponding position of the shift driver. The processing server system calibrates the CVP system based on the particular value, the corresponding position, and a known relationship between transmission speed ratios and positions of the shift mechanism. The processing server system determines or verifies a full underdrive (FUD) position by iteratively reducing a transmission speed ratio from the particular value until an onset of a backlash condition is detected and determines or verifies a full overdrive (FOD) position.

A method for controlling a vehicle gear actuator is capable of quickly and simply measuring the reference point of a shift finger. The method for controlling includes a determination step in which whether gear shifting is necessary is determined; a check step in which the first end of a shifting path is checked by moving a shift finger to the first end before moving the shift finger to the second end of the shifting path to engage a corresponding gear when gear shifting is necessary; and a concurrent control step in which the reference point of the gear actuator is learned by acquiring a full stroke of the shift finger simultaneously with engaging the corresponding gear by moving the shift finger to the second end of the shifting path after the check step.

A continuous variable planetary (CVP) system includes a CVP hub, which includes a shift mechanism including a shift driver element, and a processing server system to calibrate the CVP system and detect errors within the CVP system. The processing server system performs continuously monitoring or obtaining a transmission speed ratio of the CVP hub. Upon detecting that the transmission speed ratio reaches a particular value, the processing server system records a corresponding position of the shift driver. The processing server system calibrates the CVP system based on the particular value, the corresponding position, and a known relationship between transmission speed ratios and positions of the shift mechanism. The processing server system determines or verifies a full underdrive (FUD) position by iteratively reducing a transmission speed ratio from the particular value until an onset of a backlash condition is detected and determines or verifies a full overdrive (FOD) position.

A device and method check the position of a gearshift lever for a gearbox of a vehicle. The device is designed to determine first sensor data relating to the length of the selector travel of the selector shaft of the gearbox during at least one upshifting process which is brought about by the driver of the vehicle deflecting the gearshift lever in a first direction. The device is also designed to determine second sensor data relating to the length of the selector travel of the selector shaft of the gearbox during at least one downshifting process brought about by the driver of the vehicle deflecting the gearshift lever in a second direction. The device is designed to check the position of the gearshift lever on the basis of the first sensor data and on the basis of the second sensor data.

A continuous variable planetary (CVP) system includes a CVP hub, which includes a shift mechanism including a shift driver element, and a processing server system to calibrate the CVP system and detect errors within the CVP system. The processing server system performs continuously monitoring or obtaining a transmission speed ratio of the CVP hub. Upon detecting that the transmission speed ratio reaches a particular value, the processing server system records a corresponding position of the shift driver. The processing server system calibrates the CVP system based on the particular value, the corresponding position, and a known relationship between transmission speed ratios and positions of the shift mechanism. The processing server system determines or verifies a full underdrive (FUD) position by iteratively reducing a transmission speed ratio from the particular value until an onset of a backlash condition is detected and determines or verifies a full overdrive (FOD) position.