Invention Grant
- Patent Title: Method for executing a gearshift in an automatic transmission
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Application No.: US14533334Application Date: 2014-11-05
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Publication No.: US09625032B2Publication Date: 2017-04-18
- Inventor: Markus Maurer , Christian Villing
- Applicant: ZF Friedrichshafen AG
- Applicant Address: DE Friedrichshafen
- Assignee: ZF FRIEDRICHSHAFEN AG
- Current Assignee: ZF FRIEDRICHSHAFEN AG
- Current Assignee Address: DE Friedrichshafen
- Agency: Dority & Manning, P.A.
- Main IPC: F16H61/04
- IPC: F16H61/04 ; F16H61/686 ; F16H3/66 ; F16H3/44

Abstract:
A method is provided for executing a gearshift in an automatic transmission with several shifting elements. Upon the execution of the gearshift, a first frictional-locking shifting element is opened and a second positive-locking shifting element is closed. If, upon the execution of the gearshift, an input torque of the automatic transmission is less than a threshold value, after at least partially opening the frictional-locking shifting element and after releasing the positive-locking shifting element, there is a monitoring of whether the positive-locking shifting element is transferred into its end position. If it is then determined that the positive-locking shifting element is not in its end position, a torque transferred by the partially open frictional-locking shifting element initially increases. If, despite the increase in torque transferred by the frictional-locking shifting element, the positive-locking shifting element is not in its end position, the operating pressure of the positive-locking shifting element is then increased.
Public/Granted literature
- US20150127231A1 Method for Executing of a Gearshift Public/Granted day:2015-05-07
Information query