Method for controlling a drivetrain of a vehicle, with a drive motor and a gearbox
First Claim
1. 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 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:
- generating a request to change a current transmission ratio (i_ist) when the 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 an output of the drivetrain is less than one of an output torque threshold value and an output torque required to adjust the preset target speed (v_ziel);
varying the transmission current ratio (i_ist) of the transmission such that the output torque applied to the output of the drivetrain approaches the output torque required to approach 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) has expired;
determining and evaluating, during the first timer (TIMER1) a filtered actual acceleration of the vehicle;
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) and approaches the target speed (v_ziel), with changes in the actual speed of the vehicle (v_ist) being associated with the actual acceleration of the vehicle; and
altering the output torque of the vehicle, after a change of the current transmission ratio (i_ist) by changing an input torque of the prime mover.
1 Assignment
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Accused Products
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.
32 Citations
13 Claims
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1. 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 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 a request to change a current transmission ratio (i_ist) when the 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 an output of the drivetrain is less than one of an output torque threshold value and an output torque required to adjust the preset target speed (v_ziel); varying the transmission current ratio (i_ist) of the transmission such that the output torque applied to the output of the drivetrain approaches the output torque required to approach 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) has expired; determining and evaluating, during the first timer (TIMER1) a filtered actual acceleration of the vehicle; 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) and approaches the target speed (v_ziel), with changes in the actual speed of the vehicle (v_ist) being associated with the actual acceleration of the vehicle; and altering the output torque of the vehicle, after a change of the current transmission ratio (i_ist) by changing an input torque of the prime mover. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of 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 a request to change a current transmission ratio (i_ist) when the 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 an output of the drivetrain is less than one of an output torque threshold value and an output torque required to adjust the preset target speed (v_ziel); varying the transmission current ratio (i_ist) of the transmission such that the output torque applied to the output of the drivetrain approaches the output torque required to approach 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) has expired; determining and evaluating, during the first timer (TIMER1)m a filtered actual acceleration of the vehicle; 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) and approaches the target speed (v_ziel), with changes in the actual speed of the vehicle (v_ist) being associated with the actual acceleration of the vehicle; and re-starting the first timer (TIMER1) after at least one increase of the current transmission ratio (i_ist).
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13. A method of 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 a request to change a current transmission ratio (i_ist) when the 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 an output of the drivetrain is less than one of an output torque threshold value and an output torque required to adjust the preset target speed (v_ziel); varying the transmission current ratio (i_ist) of the transmission such that the output torque applied to the output of the drivetrain approaches the output torque required to approach 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) has expired; determining and evaluating, during the first timer (TIMER1)m a filtered actual acceleration of the vehicle; 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) and approaches the target speed (v_ziel), with changes in the actual speed of the vehicle (v_ist) being associated with the actual acceleration of the vehicle; and requesting a change to the actual transmission ratio (i_ist) according to an information signal concerning a road actually traveled by the vehicle which is sent by a transmitter device to a receptor device of the vehicle.
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Specification