A method for controlling an automatic transmission of a vehicle includes detecting a deceleration of the vehicle; detecting a cornering value of the vehicle; determining, as a function of the deceleration and as a function of the cornering value, a compensated shift-down point of a rotational speed at which shifting into a relatively low gear of the transmission occurs; and selecting a gear as a function of the compensated shift-down point.

A method for controlling the operation of a transmission of a work vehicle based on the detection of unintended vehicle motion may generally include determining an intended driving direction for the work vehicle while the vehicle is positioned on a sloped surface and initiating a shifting procedure within the transmission for engaging an on-coming clutch associated with moving the work vehicle in the intended driving direction, wherein the on-coming clutch is initially engaged at an initial ramp rate. In addition, the method may include monitoring an acceleration of the work vehicle as the on-coming clutch is being engaged, determining a current travel direction for the work vehicle based on the monitored acceleration and, when the current travel direction differs from the intended driving direction, adjusting the initial ramp rate for engaging the on-coming clutch to an increased ramp rate.

A method for controlling the operation of a transmission of a work vehicle based on the detection of unintended vehicle motion may generally include determining an intended driving direction for the work vehicle while the vehicle is positioned on a sloped surface and initiating a shifting procedure within the transmission for engaging an on-coming clutch associated with moving the work vehicle in the intended driving direction, wherein the on-coming clutch is initially engaged at an initial ramp rate. In addition, the method may include monitoring an acceleration of the work vehicle as the on-coming clutch is being engaged, determining a current travel direction for the work vehicle based on the monitored acceleration and, when the current travel direction differs from the intended driving direction, adjusting the initial ramp rate for engaging the on-coming clutch to an increased ramp rate.

A method for controlling a vehicle installed with an automatic transmission, includes: a sudden stop determination step in which a controller determines whether the vehicle has stopped at a speed greater than or equal to a reference deceleration speed and whether a post-stop elapsed time is within a first reference time; a takeoff determination step in which the controller determines whether an input torque of the transmission exceeds zero within the first reference time when a shift range is in a driving range; a pressure control step in which, when the vehicle takes off, the controller elevates a line pressure of the transmission; a limitation determination step in which if a slippage extent of a turbine exceeds a reference slippage value for a second reference time, the controller limits the takeoff; and a torque reduction step in which the controller reduces a takeoff torque input of the transmission.

A method of controlling a transmission for a vehicle may include performing deceleration intention determination, by a controller, of determining an intention of a driver for deceleration based on whether a brake pedal signal is received by the controller, upon determining that the driver intends to decelerate, performing downshift determination, by the controller, of determining an intention of the driver to use engine braking based on whether manual downshift of a shifter is performed by the driver, upon determining that the driver intends to use the engine braking, performing continuous shifting determination, by the controller, of determining whether the driver intends to implement maximum engine braking through continuous shifting, and upon determining that the driver has the intention to implement the maximum engine braking, performing continuous shifting, by the controller, of implementing maximum engine braking by shifting to a lowest gear implementable under a current driving condition.

A method of controlling a transmission for a vehicle may include performing deceleration intention determination, by a controller, of determining an intention of a driver for deceleration based on whether a brake pedal signal is received by the controller, upon determining that the driver intends to decelerate, performing downshift determination, by the controller, of determining an intention of the driver to use engine braking based on whether manual downshift of a shifter is performed by the driver, upon determining that the driver intends to use the engine braking, performing continuous shifting determination, by the controller, of determining whether the driver intends to implement maximum engine braking through continuous shifting, and upon determining that the driver has the intention to implement the maximum engine braking, performing continuous shifting, by the controller, of implementing maximum engine braking by shifting to a lowest gear implementable under a current driving condition.

A transmission system configured to perform a gear change based on a shift operation by an operator is provided, which includes a power transmission system including a transmission and configured to transmit an engine driving force to wheels, a shift operation detecting module, and a transmission controlling module adapted to be executable of a manual rotation synchronizing mode having first and second steps. In the first step, when a first shift operation for changing the transmission to a lower-speed side is detected, the transmission controlling module sends a control signal to a connecting-and-disconnecting mechanism provided to the power transmission system to suspend the transmission of the driving force. In the second step, when a second shift operation is detected, the transmission controlling module sends a control signal to the connecting-and-disconnecting mechanism to resume the transmission of the driving force while the transmission is switched to the lower-speed side.

A transmission system configured to perform a gear change based on a shift operation by an operator is provided, which includes a power transmission system including a transmission and configured to transmit an engine driving force to wheels, a shift operation detecting module, and a transmission controlling module adapted to be executable of a manual rotation synchronizing mode having first and second steps. In the first step, when a first shift operation for changing the transmission to a lower-speed side is detected, the transmission controlling module sends a control signal to a connecting-and-disconnecting mechanism provided to the power transmission system to suspend the transmission of the driving force. In the second step, when a second shift operation is detected, the transmission controlling module sends a control signal to the connecting-and-disconnecting mechanism to resume the transmission of the driving force while the transmission is switched to the lower-speed side.

A fault evaluation device for an automatic transmission evaluates a fault of the automatic transmission. The fault evaluation device is used for a vehicle having the automatic transmission and a control device configured to execute a learning process for correcting a target pressure for oil to be supplied to the automatic transmission such that variations in acceleration of the vehicle during shifting of the automatic transmission are small. The fault evaluation device includes a processor and a memory. The memory stores mapping data that prescribe mapping. The processor is configured to output an output variable, which is an evaluation value that indicates the presence or absence of the fault of the automatic transmission, when an input variable is input.

A transmission system configured to perform a gear change based on a shift operation by an operator is provided, which includes a power transmission system including a transmission and configured to transmit an engine driving force to wheels, a shift operation detecting module, and a transmission controlling module adapted to be executable of a manual rotation synchronizing mode having first and second steps. In the first step, when a first shift operation for changing the transmission to a lower-speed side is detected, the transmission controlling module sends a control signal to a connecting-and-disconnecting mechanism provided to the power transmission system to suspend the transmission of the driving force. In the second step, when a second shift operation is detected, the transmission controlling module sends a control signal to the connecting-and-disconnecting mechanism to resume the transmission of the driving force while the transmission is switched to the lower-speed side.