Systems and methods of controlling a clutch in a vehicle are provided. With the goal of enabling autonomous/assisted control of the clutch by an electronic control unit while preserving the familiar mechanical feeling at the clutch pedal that driving enthusiasts prefer, embodiments of the disclosed technology use a shuttle valve to blend control of clutch engagement between a driver and an ECU. In these embodiments, a clutch pedal in the vehicle may be mechanically connected to a piston in a first hydraulic cylinder (just like in a traditional mechanical/hydraulic clutch actuation system), and an ECU may actuate a second hydraulic cylinder. Accordingly, a shuttle valve may be used to route the fluid coming from the cylinder with the greater pressure (i.e. the driver actuated cylinder or the ECU actuated cylinder), to a third hydraulic cylinder which adjusts engagement of a clutch by a mechanical linkage.

A method for automatically warming up a clutch actuator for a clutch of a transmission in a vehicle, wherein the clutch actuator is operable by use of pressurized fluid and configured to actuate the clutch from an engaged to a disengaged state, and/or vice versa, the method including: identifying if a temperature is below a predetermined temperature value and if the clutch actuator is leaking, and if it is identified that the temperature is below the predetermined temperature value and that the clutch actuator is leaking; then repeatedly pressurizing the clutch actuator by use of the pressurized fluid until a state is reached indicative of the clutch actuator being functional, or until a maximum run out state is reached indicative of a faulty clutch actuator.

An apparatus to be applied to a vehicle including a transmission configured to execute a gear shifting operation for changing a gear ratio by engaging or disengaging friction engagement elements having friction members pushed by a piston that moves through hydraulic pressure supply to an oil chamber, the apparatus including: a memory storing mapping data for defining mapping, the mapping including a pressure variable and a period variable as input variables, the mapping including a stroke amount as an output variable, the pressure variable indicating a waiting pressure, the period variable indicating a waiting period; and a processor configured to: acquire values of the input variables, and calculate a value of the output variable by inputting, to the mapping, the acquired values of the input variables.

Methods and systems for a transmission are provided. The method includes estimating a stroke position of the hydraulic control piston based on a pressure of a fluid in a hydraulic line and a valve and a coefficient of the hydraulic line, where the hydraulic line is coupled to a chamber of the hydraulic control piston. The method further includes controlling a pressure of fluid delivered from the valve to the hydraulic control piston based on the estimated stroke position to achieve a piston stroke set-point during a filling phase.

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.

The disclosure relates to a clutch assembly for a manual transmission of a motor vehicle, having an axially running transmission input shaft which, by way of a clutch having a central release mechanism disposed on the transmission input shaft, is able to be coupled to a motor output shaft. The transmission input shaft has at least one ferromagnetic measuring portion. The magnetization of the ferromagnetic measuring portion is able to be influenced in a magnetoelastic manner by a torsion of the transmission input shaft. Portions of the central release mechanism surround the at least one measuring portion and has a sensor device which is specified for measuring a variable as a function of the magnetization of at least one measuring portion.

A number of variations may include an autonomous emergency braking system including a device for automatically opening a clutch of a transmission without driver action required. A number of variations may include a method comprising providing an autonomous emergency braking system including a device for automatically opening a clutch of a transmission without driver action required, using a sensor to detect a potential collision, and activating the device when a collision is detected to open a clutch of a transmission without driver action or input.

This clutch control device includes an engine (13), a transmission (21), a clutch device (26) configured to connect and disconnect motive power transmission between the engine (13) and the transmission (21), a clutch actuator (50) configured to drive the clutch device (26) and change a clutch capacity, a control parameter sensor (58) configured to detect a control parameter of the clutch capacity and a control unit (60) configured to calculate a control target value (TP) of the control parameter. The control unit (60) causes the clutch device (26) to perform a stroke in a connection direction until an actual measurement value of the control parameter reaches the control target value (TP). The control unit (60) corrects the control target value (TP) in accordance with at least one of a rotational speed (NE) of the engine (13) and a difference between the target value and the actual measurement value of the control parameter in a stroke process (K3) of causing the clutch device (26) to perform the stroke in the connection direction.

A control device of a hybrid vehicle including an engine, an electric motor coupled to a power transmission path between the engine and drive wheels, and a clutch connecting/disconnecting a power transmission path between the engine and both the electric motor and the drive wheels, the control device performing detection of air-fuel ratio variation between cylinders of the engine, the control device changing an operation state of the clutch based on a request drive force of the vehicle, and the control device performing the detection of air-fuel ratio variation when the clutch is in an open state or a slip amount of the clutch is equal to or larger than a preset value.

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.