Method to control a motor vehicle power train

摘要

The invention concerns a method for controlling a motor vehicle drivetrain which comprises a drive motor, a multi-step, automated change-speed transmission and an automated separating clutch arranged between the drive motor and the transmission, and a shifting device with a selector lever which can be moved at least from a particular position in an upshift direction (“+” direction) for manually initiating an upshift and in a downshift direction (“−”) for manually initiating a downshift, and in which the transmission and the separating clutch can be controlled by a transmission control unit which is connected at least to a speed sensor, a brake pedal actuation sensor and a selector lever actuation sensor, such that when the motor vehicle is rolling with its drivetrain open the closing of the drivetrain is initiated by actuating the selector lever.;To improve the functional safety it is provided that when a first movement of the selector lever in a shift direction (“+” direction or “−” direction) is sensed, this is interpreted as a provisional command to close the drivetrain, and if a second movement of the selector lever in the same shift direction (“+” direction or “−” direction) is sensed within a specified confirmation time (ΔtB), this is interpreted as a confirmation of the provisional command to close the drivetrain and, as an implementation command, initiates the closing of the drivetrain.

主权项

1. A method for controlling a motor vehicle drivetrain which comprises a drive motor, a multi-step, automated change-speed transmission and an automated separating clutch arranged between the drive motor and the transmission, and a shifting device with a selector lever which can be moved at least from a neutral position to a first particular position in an upshift direction (“+” direction) for manually initiating an upshift of the transmission and can be moved from the neutral position to a second particular position in the downshift direction(“−”) for manually initiating a downshift of the transmission, and in which the transmission and the separating clutch can be controlled by a transmission control unit which is connected at least to a speed sensor, a brake pedal actuation sensor and a selector lever actuation sensor, the method comprising the steps of:
when the motor vehicle is moving with its drivetrain disengaged, engagement of the drivetrain being initiated by actuating the selector lever, interpreting a sensed first movement of the selector lever in a shift direction (“+” direction or “−” direction) from the neutral position to one of the first or the second particular position as a provisional command to engage the drivetrain, interpreting a sensed subsequent second movement of the selector lever, from the neutral position to the one of the first or the second particular position, in a same shift direction (“+” direction or “−” direction) as the first movement within a specified confirmation time (ΔtB), as a confirmation of the provisional command to engage the drivetrain and, automatically engaging the drivetrain as an implementation command in response to the second movement of the selector lever.