Method of detecting false neutral in an automated transmission system
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United States of America Patent
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Aug 14, 2007
Grant Date -
Oct 19, 2006
app pub date -
Jun 18, 2003
filing date -
Jun 18, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
A method and system for controlling downshifting in an automated mechanical transmission system (10) utilized on a vehicle. When an automatic power downshift from a currently engaged ratio (GR) is required, the engine acceleration (EA) is monitored and compared with an engine free acceleration (EFA) to detect a false Neutral condition and to take appropriate action accordingly. Alternatively, a false Neutral condition is detected when the Absolute Value of the rotational speed of the output shaft (OS) times the currently engaged gear ratio (GR) minus the rotational speed of the input shaft (IS) is less than a predetermined value (ABS((OS*GR)-IS)).
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