Method for Operating an Automatic Transmission in a Limp Mode
AssigneeZF Friedrichshafen AG
InventorsAndreas Schmidt, Ruben Cueppers, Max Trautwein
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Abstract
The present subject matter provides a method for operating an automatic transmission in a limp mode. The method includes actuating a first non-positive shifting element to an engaged configuration and actuating a second non-positive shifting element to the engaged configuration. A positive shifting element is substantially synchronized after actuating the second non-positive shifting element. The method also includes commanding the positive shifting element to actuate from a disengaged configuration to the engaged configuration.
Claims20
A method for operating an automatic transmission in a limp mode, the automatic transmission having a plurality of non-positive shifting elements and at least one positive shifting element, the method comprising:
- actuating a first one of the plurality of non-positive shifting elements to an engaged configuration;
- actuating a second one of the plurality of non-positive shifting elements to the engaged configuration, said step of actuating the second one of the plurality of non-positive shifting elements being initiated after a start of said step of actuating the first one of the plurality of non-positive shifting elements, a first one of the at least one positive shifting element being substantially synchronized after said step of actuating the second one of the plurality of non-positive shifting elements;
- and
- commanding the first one of the at least one positive shifting element to actuate from a disengaged configuration to the engaged configuration after said step of actuating the second one of the plurality of non-positive shifting elements.
A method for operating a nine-speed automatic transmission in a limp mode, the nine-speed automatic transmission having a plurality of non-positive shifting elements and a pair of positive shifting elements, the method comprising:
- actuating an element C of the plurality of non-positive shifting elements to an engaged configuration;
- actuating an element D of the plurality of non-positive shifting elements to the engaged configuration, said step of actuating the element D being initiated after a start of said step of actuating the element C, an element F of the pair of positive shifting elements being substantially synchronized after said step of actuating the element D;
- and
- commanding the element F to actuate from a disengaged configuration to the engaged configuration after said step of actuating the element D.
Dependencies are inferred from the claim text.