Abstract: In an automatic transmission having an electronic control, a double transition powered downshift to a target range requires the release of two off-going clutches and the engagement of two on-coming clutches. The shift begins by releasing one clutch and applying another to begin (but not complete) an upshift to a third range having a speed ratio lower than both the initial range and the target range so that first an input speed increase occurs followed by an input speed decrease (pull-down). The speed decrease triggers respective application and release of the other clutches to arrest the upshift and complete the downshift. Each clutch application and release occurs gradually under an open loop control. Slip of the first off-going clutch, pull-down, speed sync at the low gear ratio and a near sync condition are determined from turbine speed and output speed and are used to time pressure command changes to smoothly coordinate clutch releases and applications.

Abstract: A valve and closure assembly has a cover plate which attaches to a transmission housing to close the interior housing from atmosphere. A separator plate and a plurality of fluid valve assemblies are secured to the cover plate and disposed within the transmission housing. Fluid passages in the cover plate interconnect the valve assemblies. Passages in the separator plate direct fluid to passages in the transmission housing at the interface of the cover plate and transmission housing for distribution within the transmission housing to components disposed therein. Electrical wiring for the solenoids and an electrical connector are disposed on the cover plate so that a single electrical interconnection with the transmission can be utilized. Filters for both high pressure control fluid and low pressure cooling and lube fluid are secured on the cover plate.