Apparatus and method for detecting end-of-fill at clutch in automatic transmission
An improved method and apparatus for detecting end-of-fill at a hydraulic clutch in an automatic transmission with a variable force solenoid are provided. The method includes: initiating clutch fill mode by commanding a high current to the solenoid whereby a high fluid pressure is delivered to the c...
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Main Authors | , |
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Format | Patent |
Language | Chinese English |
Published |
26.05.2010
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Subjects | |
Online Access | Get full text |
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Summary: | An improved method and apparatus for detecting end-of-fill at a hydraulic clutch in an automatic transmission with a variable force solenoid are provided. The method includes: initiating clutch fill mode by commanding a high current to the solenoid whereby a high fluid pressure is delivered to the clutch apply volume; monitoring clutch fill time; determining if the fill time is greater than a threshold fill time; monitoring the current (e.g., actual and filtered) being actively drawn by the solenoid during clutch fill mode in response to the fill time being greater than the threshold fill time; detecting if an aberration occurs in the current; and stopping distribution of fluid to the hydraulic clutch in response to the current aberration. Detecting if an aberration occurs preferably includes determining a change in instantaneous armature velocity, and determining if the change in instantaneous velocity is greater than a threshold change in armature velocity. |
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Bibliography: | Application Number: CN20091178289 |