System and method for multiplexing gear engagement control and providing fault protection in a toroidal traction drive automatic transmission
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United States of America Patent
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Nov 12, 2013
Grant Date -
Jun 16, 2011
app pub date -
Dec 1, 2010
filing date -
Dec 16, 2009
priority date (Note) -
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Abstract
An apparatus for multiplexing gear engagement control in an automatic transmission is provided. At least two friction engagement devices are configured to selectively engage and disengage a different gear ratio of the transmission. A trim system is configured to selectively supply engagement and disengagement pressures to at least one fluid passageway. A first control valve is fluidly coupled directly to the at least one fluid passageway and directly to each of the at least two friction engagement devices. The first control valve is configured to selectively route the engagement and disengagement pressures through the first control valve directly to the at least two friction devices.
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