Machine element or mechanism – Gearing – Interchangeably locked
Patent
1998-04-20
1999-12-21
Ta, Khoi Q.
Machine element or mechanism
Gearing
Interchangeably locked
477120, 74335, F16H 5930
Patent
active
060033967
ABSTRACT:
A system for controlling automatic transmission downshift points includes a control computer for electronically controlling an internal combustion engine and a transmission having at least one automatically selectable gear. The control computer is responsive to at least a throttle signal, provided by either a manually actuatable accelerator pedal or a cruise control system, to compute an engine load value, and is further responsive to either an engine speed signal or a vehicle speed signal to compute a deceleration value. The control computer is operable to compute a downshift engine RPM value based on the deceleration value and either the throttle signal or the engine load value, wherein the downshift engine RPM value is lower than a default downshift engine RPM if the deceleration value indicates a relatively slow deceleration rate and the throttle signal or the engine load value indicates high throttle or engine load. Conversely, the downshift engine RPM value is higher than the default downshift engine RPM value if the deceleration value indicates a relatively high deceleration rate and the throttle signal or the engine load indicates high throttle or engine load.
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Bache Daniel W.
Bellinger Steven M.
Cooper Stephen L.
Munt David J.
Cummins Engine Company, Inc.
Ta Khoi Q.
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