Patent ID: 8057355
Filing Date: 2011-11-15
Classification: F16H,Y10T

Abstract:
1. A method of regulating a hydraulic control system operable to distribute pressurized fluid to a hybrid transmission in power flow communication with an engine and at least one motor, the hydraulic control system including a main pump in fluid communication with a main regulator valve, and an auxiliary pump in fluid communication with an auxiliary regulator valve, the method comprising: determining if the engine is transitioning to an engine auto-stop; determining a first current line pressure requirement of the transmission if the engine is transitioning to an engine auto-stop; setting a start-up auxiliary pump pressure equal to a minimum auxiliary pump pressure; starting the auxiliary pump; increasing a speed of the auxiliary pump; modifying a current auxiliary pump pressure to equal said first current line pressure requirement by providing a first boost pressure to the auxiliary regulator valve with a first pressure control solenoid in fluid communication therewith; and stopping the main pump.