Method for Detecting a Nonoperational Shift Element in an Automatic Transmission
a technology of automatic transmission and shift element, applied in the field of automatic transmission, can solve the problems of difficult or expensive detection of proper actuation of shift elements in order to avoid overdetermining automatic transmission, and the shift elements cannot adjust between engaged and disengaged states,
Active Publication Date: 2016-04-14
ZF FRIEDRICHSHAFEN AG
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Benefits of technology
This patent relates to a method for detecting malfunctions in the shift elements of an automatic transmission. The method involves operating the automatic transmission in an intermediate gear and measuring the gear ratio while the selected shift element is in a disengaged configuration. By analyzing the gear ratio, the method can determine if the shift element is malfunctioning. This helps to quickly identify and repair any malfunctions in the automatic transmission, which can prolong the life of the transmission and improve overall performance.
Problems solved by technology
However, shift elements can fail to adjust between the engaged and disengaged states for a variety of reasons.
If a shift elements sticks or does not operate properly, performance of the automatic transmission can be negatively affected.
However, detecting proper actuation of the shift elements in order to avoid overdetermining the automatic transmission can be difficult or expensive.
For example, adding an additional sensor to the automatic transmission can increase a cost and manufacturing time of the automatic transmission.
Method used
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[0016]Reference now will be made in detail to embodiments of the invention, one or more examples of which are illustrated in the drawings. Each example is provided by way of explanation of the invention, not limitation of the invention. In fact, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the scope or spirit of the invention. For instance, features illustrated or described as part of one embodiment can be used with another embodiment to yield a still further embodiment. Thus, it is intended that the present invention covers such modifications and variations as come within the scope of the appended claims and their equivalents.
[0017]FIG. 1 provides a schematic view of an automatic transmission 10 according to an exemplary embodiment of the present subject matter. Automatic transmission 10 may be constructed or arranged in a similar manner to the automatic transmission described i...
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A method for detecting a malfunctioning shift element in an automatic transmission is provided. The method includes operating the automatic transmission in an intermediate gear. A selected shift element of the automatic transmission is commanded to a disengaged configuration in the intermediate gear. The method also includes measuring a gear ratio of the automatic transmission while the automatic transmission is operating in the intermediate gear, and determining whether the selected shift element of the automatic transmission is malfunctioning based at least in part on the gear ratio of the automatic transmission in the intermediate gear.
Description
FIELD OF THE INVENTION[0001]The present subject matter relates generally to automatic transmissions, such as nine-speed automatic transmissions.BACKGROUND OF THE INVENTION[0002]Automatic transmissions generally include at least one planetary gear set and a plurality of shift elements. The shift elements selectively engage components of the planetary gear sets in order to hinder or prevent rotation of the components. Selective actuation of the shift elements adjusts the gear ratio of the automatic transmission and shifts the automatic transmission between its various gears.[0003]Proper actuation of the shift elements provides smooth shifting between gears and improves performance of the automatic transmission. Thus, shift elements preferably adjust between engaged states and disengaged states in a reliable manner. However, shift elements can fail to adjust between the engaged and disengaged states for a variety of reasons. For example, splines of a shifting element may lock together ...
Claims
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IPC IPC(8): F16H61/12
CPCF16H61/12F16H2061/1276F16H2061/124F16H2059/706F16H2061/1208F16H2061/168
Inventor STEINHAUSER, KLAUSWELLER, JENSMIHATSCH, GEORGARNOLD, JORG
Owner ZF FRIEDRICHSHAFEN AG