Method and apparatus to control an electro-hydraulic transmission during shifting event
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United States of America Patent
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Mar 3, 2009
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N/A
app pub date -
Aug 4, 2006
filing date -
Aug 4, 2006
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Abstract
A method and control system is presented to selectively actuate a plurality of clutches of a two-mode, compound-split, electro-mechanical transmission. The method comprises executing a shift operation from a first to a second operating mode and monitoring shift abort criteria. A revised shift operation is executed to control the transmission shift into a third operating mode effective to meet an operator request for output torque. The exemplary transmission has four fixed gear ratio modes and two continuously variable modes. The preferred shift abort criteria include: monitoring the operator request for output torque; identifying presence of a fault in an oncoming torques transfer device effective to facilitate operation in the second operating mode; monitoring an optimization routine for managing torque inputs from the plurality of torque-generative devices.
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