Disclosed is method for operating a multi-gear vehicle transmission having a plurality of shifting elements (A, B, C, D, E) for engaging gears of the vehicle transmission. In a neutral gear a transmission input (1) and a transmission output (2) of the vehicle transmission are decoupled from one another. In a driving gear the transmission input (1) and the transmission output (2) of the vehicle transmission are coupled with one another by closing the shifting elements (A, B, C, D, E) associated with the driving gear in order to propel the vehicle. When the neutral gear is engaged, a transmission condition is determined, and if a transmission condition with elevated drag losses exists, then in addition to the shifting elements (A, B, C, D, E) of a driving gear, at least one further shifting element (A, B, C, D, E) of the vehicle transmission is closed.

An enhanced control system for an electronic automatic transmission enables the transmission to operate in a full neutral idle, a reverse lockout, and an inching mode. These functions improve the mileage and durability of the operation of the transmission. They also enable the inching mode for use especially in industrial applications.

A control system of a vehicle is provided, which includes an automatic transmission, a brake controller, and a processor configured to execute a neutral idle controlling module, a hydraulic pressure calculating module, a hydraulic pressure controlling module to calculate a target value of hydraulic pressure supplied to a frictional engageable element according to a given parameter, and a brake hold controlling module. The calculating module includes a first calculating submodule executed to calculate the target value in a period from an issuance of a vehicle start request when a neutral idle control is executed and a brake hold control is not executed in a vehicle stopped state until the frictional engageable element is engaged, and a second calculating submodule executed to calculate the target value so that a calculated value is lower than in the first calculation when the value of the parameter is the same.

Disclosed is a method for controlling a neutral gear of an automatic transmission. The method includes: when a neutral gear control function of the automatic transmission is in an activated state, an automatic Transmission Control Unit (TCU) collects information on a pressure of a brake main cylinder, a state of a brake pedal, and whether an autohold function is in an activated state or not; and when the pressure of the brake main cylinder is smaller than a pressure threshold P.sub.3 of the neutral gear control function and the autohold function is in an inactivated state, or when the brake pedal is in an unstamped state and the autohold function is in the inactivated state, the automatic TCU controls the neutral gear control function to exit from the activated state.

The present disclosure provides a method for maintaining idle noise refinement in a vehicle. The method may include performing a D-range neutral control, wherein a controller is configured to apply auto hold threshold values to conditions for entering an auto hold control in a neutral control state, and wherein the auto hold threshold values are determinant of an entry into the D-range neutral control such that the auto hold threshold values limit the conditions for entering the auto hold control.

A control system of a vehicle is provided, which includes an automatic transmission, a brake controller, and a processor configured to execute a neutral idle controlling module, a hydraulic pressure calculating module, a hydraulic pressure controlling module to calculate a target value of hydraulic pressure supplied to a frictional engageable element according to a given parameter, and a brake hold controlling module. The calculating module includes a first calculating submodule executed to calculate the target value in a period from an issuance of a vehicle start request when a neutral idle control is executed and a brake hold control is not executed in a vehicle stopped state until the frictional engageable element is engaged, and a second calculating submodule executed to calculate the target value so that a calculated value is lower than in the first calculation when the value of the parameter is the same.

The invention relates to a method for preventing a motor vehicle from rolling away, in which the motor vehicle includes an automated manual transmission, preferably a dual-clutch transmission. In the method in which a vehicle of this type is reliably prevented from rolling away, the NEUTRAL selector lever position is engaged only when the motor vehicle is at a standstill and a motor vehicle brake has been actuated.

A method for automatically controlling a shift stage may include a shift stage check operation of detecting a position of the shift stage of a vehicle, a driving and stopping sensing operation, of detecting driving state information of the vehicle to determine whether the vehicle is in a driving or a stopping condition, a learning preparing operation, of identifying whether the shift stage is shifted from a D stage to an N stage when it is determined that the shift stage enters the stopping condition at the D stage, a learning operation, of measuring a shifting time from when the shift stage enters the stopping condition at the D stage to when the shift stage is shifted to the N stage, and a learning execution operation, of automatically shifting the shift stage from the D stage to the N stage in the stored shifting time.

Methods and systems for improving vacuum generation for an engine that may be operated at higher altitudes are presented. In one non-limiting example, a transmission that is mechanically coupled to the engine may be shifted from a gear to neutral in response to an actual total number of times a vehicle brake pedal is applied and partially released while the vehicle is stopped and the brake pedal is applied.

One or more controllers, responsive to detecting a voltage at a jump start power input of a vehicle, attempt activation of a secondary power converter of the vehicle, and responsive to the activation of the secondary power converter being unsuccessful, attempt activation of a primary power converter of the vehicle.