Method for Operating an Automatic Transmission
AssigneeZF Friedrichshafen AG
InventorsAndreas Schmidt, Markus Maurer, Ruben Cueppers, Max Trautwein
Life of this patent
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Abstract
A method for operating an automatic transmission is provided. The method includes initiating a synchronization of a positive shifting element of the automatic transmission. The method also includes closing a first non-positive shifting element of the automatic transmission and positioning a second non-positive shifting element of the automatic transmission at an engaged configuration of the second non-positive shifting element during the synchronization of the first positive shifting element in order to synchronize the first positive shifting element.
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:
- closing a first non-positive shifting element of the plurality of shifting elements;
- positioning a second non-positive shifting element of the plurality of shifting elements at an engaged configuration of the second non-positive shifting element;
- commanding a first positive shifting element of the at least one positive shifting element to actuate from a disengaged configuration to an engaged configuration;
- determining a position of the first positive shifting element after said step of commanding;
- and
- actuating a third non-positive shifting element of the plurality of shifting elements if the first positive shifting element is in an intermediate position at said step of determining.
A method for operating a nine-speed automatic transmission, the nine-speed automatic transmission including a friction shifting element C, a friction shifting element D, a friction shifting element E, and a dog clutch F, the method comprising:
- initiating a synchronization of dog clutch F;
- closing the friction shifting element C during the synchronization of dog clutch F;
- positioning the friction shifting element D at an engaged configuration of the friction shifting element D during the synchronization of dog clutch F;
- commanding the dog clutch F to actuate to an engaged configuration during the synchronization of dog clutch F;
- determining a position of the dog clutch F after said step of commanding;
- and
- actuating the friction shifting element E if the dog clutch F is in an intermediate position at said step of determining.
A method for operating an automatic transmission, comprising:
- initiating a synchronization of a positive shifting element of the automatic transmission, an output speed of the automatic transmission being less than a threshold output speed at said step of initiating;
- closing a first non-positive shifting element of the automatic transmission during the synchronization of the positive shifting element;
- positioning a second non-positive shifting element of the automatic transmission at an engaged configuration of the second non-positive shifting element during the synchronization of the positive shifting element, the positive shifting element being synchronized after said step of positioning;
- and
- commanding the positive shifting element to an engaged configuration during the synchronization of the positive shifting element.
Dependencies are inferred from the claim text.