Method for Controlling a Drive Train of a Vehicle, with a Drive Motor and a Gearbox
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Abstract
A method for controlling a vehicles drivetrain including an engine and automatic transmission, such that transmission ratios are shifted within a range of transmission ratios in a continuous and/or stepped manner as function of preset target speeds that are adjustable via a vehicle speed control and actual vehicle inclinations in relation to the vehicles longitudinal axis. When the actual speed of the vehicle differs from a preset threshold speed, a request to change an actual ratio of the transmission is generated, if it has been determined that the output torque is smaller than a threshold value or an output torque required to adjust the preset threshold speed of the vehicle. The ratio of the transmission is shifted so the torque applied to the output is modified toward the output torque required to adjust the threshold speed.
117 Citations
28 Claims
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1-15. -15. (canceled)
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16. A method for controlling a drivetrain of a vehicle with a prime mover and a transmission with ratios (i_ist) that are automatically varied within a ratio range in at least one of a continuous manner and a stepped manner as a function of target speeds (v_ziel) which are preset via a vehicle speed control, and a vehicle inclination, calculated at any time, relative to a longitudinal axis of the vehicle, the method comprising the steps of:
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generating, when a vehicle speed control is activated and an actual speed of the vehicle (v_ist) is different from a preset target speed (v_ziel) and when a determination has been made that an output torque applied to output of the drivetrain is less than one of a threshold value and an output torque required to adjust the preset target speed (v_ziel), a request to change a current transmission ratio (i_ist); varying the transmission current ratio (i_ist) of the transmission such that the output torque applied to output of the drivetrain approaches the output torque required to adjust the target speed (v_ziel); starting a first timer (TIMER1) after an increase of the current transmission ratio (i_ist) and preventing another change of the current transmission ratio (i_ist) until the first timer (TIMER1) expires; determining and evaluating, during the first timer (TIMER1) a filtered actual acceleration of the vehicle; and omitting an additional increase of the current transmission ratio (i_ist) of the vehicle when the actual speed of the vehicle (v_ist) changes after an increase of the current transmission ratio (i_ist) approaches the target speed (v_ziel). - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification