Patent ID: 9222575
Filing Date: 2015-12-29
Classification: F16H

Abstract:
1. A system for lubricating transmission components with hydraulic fluid comprising: a pump with an inlet port that receives hydraulic fluid and an outlet port from which hydraulic fluid is pumped to the transmission components; and a motor coupled to the pump, a controller that commands the operation of said pump and said motor, operation of said controller including a target pump pressure of the pump being regulated by a command motor torque, and the command motor torque being set by varying a pump speed determined from one of a series of 3-D look-up tables that characterizes the pump pressure, the command motor torque, and the pump speed as a function of temperature, wherein a flow rate of the hydraulic fluid is based on the pump speed and a pump displacement, the pump pressure being determined from the flow rate and without the use of a pressure sensor, and wherein the pump pressure is provided as feedback to determine a desired pump speed.