Method for Operating an Automatic Transmission
AssigneeZF Friedrichshafen AG
InventorsMarkus Maurer, Martina Jehle, Ruben Cueppers, Max Trautwein
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Abstract
A method for operating an automatic transmission is provided. The method includes synchronizing a positive shifting element of the automatic transmission, braking the automatic transmission with a first non-positive shifting element of the automatic transmission, establishing a position of the positive shifting element, and increasing a pressure of fluid supplied to a second non-positive shifting element of the automatic transmission if the position of the positive shifting element is an intermediate position.
Claims20
A method for operating an automatic transmission, the automatic transmission having a plurality of non-positive shifting elements and at least one positive shifting element, the method comprising:
- synchronizing a first positive shifting element of the at least one positive shifting element;
- braking the automatic transmission with a first non-positive shifting element of the plurality of non-positive shifting elements;
- commanding the first positive shifting element of the at least one positive shifting element to actuate from a disengaged configuration to an engaged configuration after said step of synchronizing, a second non-positive shifting element and a third non-positive shifting element of the plurality of non-positive shifting elements being in the engaged configuration at said step of commanding;
- establishing a position of the first positive shifting element of the at least one positive shifting element after said step of commanding;
- and
- increasing a pressure of fluid supplied to the second non-positive shifting element of the plurality of non-positive shifting elements if the position of the first positive shifting element of the at least one positive shifting element is an intermediate position at said step of establishing.
A method for operating a nine-speed automatic transmission, the nine-speed automatic transmission including a dog clutch A, a friction shifting element C, a friction shifting element D, and a friction shifting element E, the method comprising:
- synchronizing the dog clutch A;
- braking the automatic transmission with the friction shifting element C;
- commanding the dog clutch A to actuate from a disengaged configuration to an engaged configuration after said step of synchronizing, the friction shifting element D and the friction shifting element E being in the engaged configuration at said step of commanding;
- establishing a position of the dog clutch A after said step of commanding;
- and
- increasing a pressure of fluid supplied to the friction shifting element D if the position of the dog clutch A is an intermediate position at said step of establishing.
Dependencies are inferred from the claim text.