A gear-position learning device for an automatic clutch transmission includes a transmission configured to be shifted by an operation of a driver of a vehicle, a clutch device disposed in a transmission path between the transmission and an engine and configured to be connected and disconnected by actuation of a clutch actuator, a controller configured to control connection and disconnection of the clutch device performed by the clutch actuator, a shift drum configured to rotate according to a shift operation that the driver performs on a shift operator and switch the shift stage of the transmission, and a rotational position defining mechanism configured to define a rotational position of the shift drum, wherein the controller has a learning mode for learning a rotation angle of the shift drum and is configured to control connection and disconnection of the clutch device during the learning mode such that the shift drum is at a rotational position determined by the rotational position defining mechanism.

A shift range control device switches a shift range by controlling driving of a motor. A learning unit learns, as a position correction value, a normal state time correction value calculated based on at least one of a first reference angle and a second reference angle when at least one output shaft signal is available at a time of turning on of a start switch. The first reference angle is a motor angle at timing when the output shaft signal changes in response to the rotation of the motor in a first direction. The second reference angle is the motor angle at timing when the output shaft signal changes in response to the rotation of the motor in a second direction opposite to the first direction. A target setting unit sets a motor angle target value by using the normal state time correction value stored in a storage unit during a period from when all the output shaft signals are determined to be unavailable to when the start switch is turned off.

A shift range controller includes a target speed setter that sets a target motor speed for a motor based on an angle deviation between a current rotation position of the motor and a target rotation position based on a requested shift range. A requested duty calculator calculates a requested duty as a drive control amount for driving the motor based on the target motor speed. The target speed setter receives a feedback of the requested duty, and changes the target motor speed at a deceleration time based on the feedback of the requested duty. By changing the target motor speed based on the requested duty, the target motor speed is optimized for responding to impediment-causing factors such as temperature and friction. In such manner, the shift range switching responsiveness is improved.

A method for operating a drive train (1) of a vehicle includes, in order to check the plausibility of an adapted charge pressure value, changing an actuating pressure of a starting component (7) corresponding to an adapted charge pressure value by an offset and ascertaining a resultant change in a torque of an electric machine (3). When the change in the torque of the electric machine (3) and the offset of the actuating pressure correspond to each other within defined limits, a plausible adapted charge pressure value is inferred. When the change in the torque of the electric machine (3) and the offset of the actuating pressure do not correspond to each other within the defined limits, an implausible adapted charge pressure value is inferred.

A vehicle includes a transmission having a torque converter, a device configured to generate line pressure, and at least one fluid path connecting the device in fluid communication with the torque converter. A controller is programmed to, responsive to an engine-off time exceeding a threshold and a parameter indicative of departure being present, command the device to generate line pressure so that fluid is supplied to the torque converter. The device may be a transmission pump or an accumulator.

Disclosed herein are systems and methods for initiating over-the-air (OTA) programming (together, OTAP) of a transmission control module (TCM) of a vehicle. In an embodiment, a TCM determines that an OTAP update is available, and responsively presents an update-ready indication via an operator interface of the vehicle, and thereafter determines whether each precondition in a set of one or more preconditions is satisfied, including a precondition that a valid initiate-update instruction has been received via the operator interface. If the TCM determines that each precondition in the set is satisfied, the TCM then responsively initiates installation of the OTAP update. If, however, the TCM determines that at least one precondition in the set is not satisfied, the TCM then responsively does not initiate installation of the OTAP update.

A vehicle includes a transmission having a torque converter, a device configured to generate line pressure, and at least one fluid path connecting the device in fluid communication with the torque converter. A controller is programmed to, responsive to an engine-off time exceeding a threshold and a parameter indicative of departure being present, command the device to generate line pressure so that fluid is supplied to the torque converter. The device may be a transmission pump or an accumulator.

A control circuit controls driving of a motor to switch over a shift range. A target rotation speed setting part sets a target rotation speed of the motor. A rotation speed detection part detects a present rotation speed, which is an actual rotation speed, of the motor. A rotation speed error calculation part calculates a rotation speed error, which is an error between the target rotation speed and the present rotation speed. A request torque calculation part calculates a request torque for the motor based on the rotation speed error. A phase lead correction value calculation part calculates a phase lead correction value of a current supply phase relative to a rotation phase of a rotor of the motor based on the request torque.

A method for actuating a hydraulic system of a transmission comprising a variable displacement hydraulic pump and a pilot-controllable system pressure valve, the method including, in order to determine a pump characteristic curve of the hydraulic pump, initially transferring the hydraulic system into a defined operating condition range in which the volumetric output flow, routed via the system pressure valve and applied at the system pressure valve by the hydraulic pump, is greater or less than a hydraulic fluid flow out of the hydraulic system. The method further includes pilot-controlling the system pressure valve to set a defined pressure level of the system pressure. The method additionally includes reducing or increasing the volumetric output flow while monitoring the system pressure, and determining a volumetric output flow corresponding to the hydraulic fluid flow of the hydraulic system with a certain deviation of a current system pressure from the defined system pressure.

A control system for a vehicle includes one or more controllers, wherein the control system is configured to: receive a driver gear shift request; determine if the vehicle is in a vehicle initialisation period; determine if a driver of the vehicle is actuating at least one brake of the vehicle; store the driver gear shift request in dependence-based at least in part on the determination that the vehicle is in the vehicle initialisation period and the driver is actuating at least one brake of the vehicle; determine if the vehicle initialisation period has ended; and control execution of the stored driver gear shift request when the vehicle initialisation period has ended.