Machine element or mechanism – Gearing – Interchangeably locked
Patent
1999-04-01
2000-06-27
Wright, Dirk
Machine element or mechanism
Gearing
Interchangeably locked
F16H 5902
Patent
active
060792884
ABSTRACT:
A novel transmission is provided that has a first, second, third and fourth gear, wherein said second gear includes two alternate and selectable speed ratios. The primary speed ratio of the second gear is used during upshifts and downshifts of adjacent gears. The alternate speed ratio of the second gear is utilized exclusively during downshifts from non-adjacent gears and may also be utilized during a downshift from the third gear depending on certain conditions and parameters. The primary speed ratio is larger than the alternate speed ratio of the second gear to provide better acceleration characteristics of the transmission during upshifting. The smaller alternate speed ratio of the second gear can provide smoother downshifts because of the less abrupt speed ratio change from the higher gears. Also, a method for controlling the gear selection of an automatic transmission having a plurality of gears is provided, wherein one position includes two speed ratios.
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Dourra Hussein A.
Holbrook Gerald L.
DaimlerChrylser Corporation
Lorelli Marc
Wright Dirk
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