Method and apparatus for controlling an electrically powered hydraulic pump in a powertrain system
AssigneeGM Global Technology Operations LLC
InventorsAli K. Naqvi, Patrick M. Prihoda, Eric S. Tryon
Life of this patent
Estimating the term…
Abstract
A powertrain system includes a transmission employing an electrically-powered hydraulic pump providing pressurized hydraulic fluid to a hydraulic circuit. A method of operating the powertrain system includes monitoring a temperature of the hydraulic pump. In response to the temperature exceeding a threshold temperature, power output from an electrically-powered motor coupled to the hydraulic pump is derated, which includes decreasing rotational speed of the hydraulic pump and maintaining hydraulic pressure in the hydraulic circuit.
Claims12
Method for operating a powertrain system including a transmission employing an electrically-powered hydraulic pump providing pressurized hydraulic fluid to a hydraulic circuit, comprising:
- monitoring a temperature of the hydraulic pump;
- and
- in response to said temperature exceeding a threshold temperature, derating power output from an electrically-powered motor coupled to the hydraulic pump including decreasing rotational speed of the hydraulic pump, decreasing flow of hydraulic fluid to a low-pressure sub-circuit of the hydraulic circuit and maintaining hydraulic pressure in the hydraulic circuit.
Method for operating a multi-mode powertrain system including a transmission mechanically coupled to electrically-powered torque machines, said transmission employing an electrically-powered hydraulic pump providing pressurized hydraulic fluid to a hydraulic circuit, the method comprising:
- derating power output from an electric motor rotatably coupled to the hydraulic pump including decreasing rotational speed of the hydraulic pump, decreasing flow of hydraulic fluid to a low-pressure sub-circuit of the hydraulic circuit and maintaining hydraulic pressure in the hydraulic circuit when a temperature of the electric motor exceeds a maximum threshold temperature;
- and
- discontinuing the derating power output from the electric motor when the temperature of the electric motor is less than the maximum threshold temperature.
Dependencies are inferred from the claim text.