Method and apparatus for controlling a hydraulic pump for a multimode transmission of a powertrain system
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United States of America Patent
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Mar 3, 2015
Grant Date -
Nov 28, 2013
app pub date -
May 24, 2012
filing date -
May 24, 2012
priority date (Note) -
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Abstract
A powertrain system includes an internal combustion engine configured to execute autostop and autostart operations, and a multi-mode transmission with an electrically-powered hydraulic pump configured to provide pressurized hydraulic fluid to a hydraulic circuit. A Method for controlling operation of the hydraulic pump includes operating the hydraulic pump in a low power mode only when the engine is in an engine-off state, operator inputs to a brake pedal, an accelerator pedal, and a transmission range selector are within allowable states, temperatures of select transmission components are within respective predetermined temperature ranges, and transmission output torque is less than a threshold torque request.
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