Patent ID: 9541191
Date: 2017-01-10
CPC Classifications: F16H,Y10T

Claim:
1. An apparatus for controlling fluid flow in a motor vehicle transmission including at least one friction engagement device, a fluid-using sub-system separate from and in addition to the at least one friction engagement device and a lubrication and cooling sub-system, the apparatus comprising: a first pump driven by an input shaft of the transmission to supply fluid from a source of fluid to the at least one friction engagement device via a first fluid passageway, a second pump driven by the input shaft of the transmission to supply fluid from the source of fluid to a second fluid passageway, and a valve fluidly coupled to the first and second fluid passageways, to the fluid-using sub-system, and to the lubrication and cooling sub-system, the valve fluidly coupling the first fluid passageway to the fluid-using sub-system and fluidly coupling the second fluid passageway to the lubrication and cooling sub-system when (i) a flow rate of the fluid in the first fluid passageway is greater than a threshold fluid flow rate and (ii) a temperature of the fluid is less than a temperature threshold, wherein only the first pump supplies fluid to the at least one friction engagement device and to the fluid-using sub-system via the first fluid passageway and wherein only the second fluid pump supplies fluid to the lubrication and cooling sub-system via the second fluid passageway.