Method of detecting false neutral in a transmission system

An automated mechanical transmission control method includes monitoring engine acceleration when downshifting from a current gear and comparing this with an engine free acceleration to detect a false neutral condition and to take appropriate action such as retaining the currently engaged gear. When...

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Bibliographische Detailangaben
Hauptverfasser: KWOK WAH CHAN, ANTHONY STASIK, JEFFREY PHILIP HAWARDEN, ROBERT STANLEY WHEELER
Format: Patent
Sprache:eng
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Beschreibung
Zusammenfassung:An automated mechanical transmission control method includes monitoring engine acceleration when downshifting from a current gear and comparing this with an engine free acceleration to detect a false neutral condition and to take appropriate action such as retaining the currently engaged gear. When the false neutral condition is not detected the method continues with downshifting to a target gear ratio. The free engine acceleration is a predefined value that depends on an engine manufacturer and may be learned value once an initial value has been set. In another embodiment a rotational speeds of an input and output shaft can be compared to determine whether they remain within a predetermined value from the currently engaged gear ratio and if not a false neutral condition is detected.