Patent ID: 8915076
Filing Date: 2014-12-23
Classification: F16H

Abstract:
1. A hydraulic control system for a transmission in a motor vehicle, the hydraulic control system comprising: an engine driven pump for providing a first supply of hydraulic fluid; an electric motor driven pump for providing a second supply of hydraulic fluid; a first one-way valve disposed in downstream fluid communication with the engine driven pump and configured to allow the first supply of hydraulic fluid to flow from the engine driven pump through the first one-way valve; a second one-way valve disposed in downstream fluid communication with the electric motor driven pump and configured to allow the second supply of hydraulic fluid to flow from the electric motor driven pump through the second one-way valve; a clutch control circuit disposed in downstream fluid communication with both the first and second one-way valves; a pressure regulator valve disposed in downstream fluid communication with the engine driven pump, wherein the pressure regulator valve is moveable between a first position and a second position; and a lubrication control circuit disposed in downstream fluid communication with the pressure regulator valve, wherein the pressure regulator valve allows fluid communication from the engine driven pump to the lubrication control circuit when in the first position and wherein the pressure regulator valve prohibits fluid communication from the engine driven pump to the lubrication control circuit when in the second position, and wherein the engine driven pump and the electric motor driven pump are operated simultaneously so that the first supply of hydraulic fluid supplies the lubrication control circuit and the second supply of hydraulic fluid supplies the clutch control circuit.