Transmission control system
AssigneeZF Friedrichshafen AG
InventorsHarald Stehle, Günther Maier, Christian Villing
Life of this patent
Estimating the term…
Abstract
A gearbox (100) includes an input shaft (105), which is connected to a drive source, and a first and a second proportionally controllable shift element (A-F). A method (200) for open-loop control of the gearbox (100) includes: determining (210) an absolute torque demand (330) on the drive source on the basis of a profile controlled by way of an open-loop system (340) and a profile controlled by way of a closed-loop system (345); determining (220) whether the absolute torque demand (330) threatens to exceed a predetermined threshold value (335); and, in response, reducing (225) the portion controlled by way of the closed-loop system (345).
Claims7
A method (200) for open-loop control of a gearbox (100) that includes an input shaft (105) connected to a drive source, a first proportionally controllable shift element (A-F) and a second proportionally controllable shift element (A-F), the method (200) comprising:
- determining (210) an absolute torque demand (330) on the drive source on the basis of a profile controlled by way of an open-loop system (340) and a profile controlled by way of a closed-loop system (345);
- determining (220) whether the absolute torque demand (330) threatens to exceed a predetermined threshold value (335);
- and
- when the absolute torque demand (330) threatens to exceed the predetermined threshold value (335), reducing (225) the portion of the absolute torque demand (330) controlled by way of the closed-loop system (345).
A device (125) for open-loop control of a gearbox (100) that includes an input shaft (105) connected to a drive source, a first proportionally controllable shift element (A-F) and a second proportionally controllable shift element (A-F), the device (125) comprising:
- an interface for connection to the drive source;
- a processing unit (125);
- and
- a memory storing computer-executable instructions that, when executed by the processing unit (125), cause the processing unit (125) to perform operations comprising
- determining an absolute torque demand (330) on the drive source on the basis of a profile controlled by way of an open-loop system (340) and a profile controlled by way of a closed-loop system (345),
- determining whether the absolute torque demand (330) threatens to exceed a predetermined threshold value (335), and
- when the absolute torque demand (330) threatens to exceed the predetermined threshold value (335), reducing the portion of the absolute torque demand (330) controlled by way of the closed-loop system (345).
Dependencies are inferred from the claim text.