Fast valve actuation system for an automatic transmission
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United States of America Patent
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Oct 10, 2017
Grant Date -
Jan 22, 2015
app pub date -
Oct 7, 2014
filing date -
Dec 16, 2009
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Abstract
A fast valve actuation system for an automatic vehicle transmission includes a pair of spring-biased shift valves. Solenoids control the application of pressurized hydraulic fluid to the head of each of the shift valves. Each shift valve has at least one port that is coupled to a fluid chamber of a torque transferring mechanism of an automatic transmission. The position of each of the shift valves determines whether its ports are connected with fluid pressure. Fluid passages connect the head of each shift valve to the spring pocket of the other shift valve.
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