Patent ID: 9383004
Filing Date: 2016-07-05
CPC Classification: F01M,F16H

Claim Text:
1. A method of controlling fluid flow and pressure in a hydraulic system of a transmission, comprising: providing a controller, a variable displacement pump, a hydraulic controls, a fluid circuit fluidly coupled to the pump, a regulator valve, a pressure switch, and a solenoid for operably controlling pump displacement; pumping fluid from the pump into the fluid circuit to produce a fluid flow and pressure therein; regulating the pressure in the fluid circuit at a regulation pressure; detecting the regulation pressure with the pressure switch and communicating the regulation pressure to the controller; determining a leakage adaptive factor as a function of the regulation pressure, a pump leakage factor, a hydraulic controls leakage factor, and a plurality of geometrical restrictions in the fluid circuit; and adjusting the displacement of the pump from a first displacement to a second displacement as a function of the leakage adaptive factor.