Patent ID: 8402993

Claim:
A hydraulic fluid cooling system for a transmission of a motor vehicle, the hydraulic fluid cooling system comprising: a hydraulic fluid pressure source; a hydraulic fluid cooler having an inlet port and an outlet port; a pressure control valve assembly having an inlet port in communication with the hydraulic fluid pressure source and an outlet port in communication with the inlet port of the hydraulic fluid cooler; a first clutch cooling circuit having an inlet port in communication with the outlet port of the hydraulic fluid cooler through a first hydraulic fluid passage having a restrictive orifice; a second clutch cooling circuit having an inlet port in communication with the outlet port of the hydraulic fluid cooler through a second hydraulic fluid passage having a restrictive orifice; and a logic valve having an inlet port in communication with the outlet port of the hydraulic fluid cooler, a first outlet port in communication with the inlet port of the first clutch cooling circuit and a second outlet port in communication with the inlet port of the second clutch cooling circuit, and wherein the logic valve further includes a valve movable between at least a first position and a second position, wherein the inlet port of the logic valve is in communication with the first outlet port of the logic valve when the valve is in the first position, and wherein the inlet port of the logic valve is in communication with the second outlet port of the logic valve when the valve is in the second position.