Systems and methods for a hydraulic system
AssigneeCaterpillar Inc.
InventorsAndrew Olson, Dustin D. Denning, Christopher L. Wynkoop, Srikar Thaduvayi, Karl P. Schneider
Life of this patent
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Abstract
A method for controlling an electric motor driving a hydraulic pump for a battery-powered electric mobile machine includes receiving one or more command signals for one or more hydraulically-driven systems. The method also includes determining a minimum pump speed for each of the one or more hydraulically-driven systems, and determining a highest minimum pump speed for the one or more hydraulically-driven systems. The method further includes converting the highest minimum pump speed to an electric motor command, and sending the electric motor command to the electric motor.
Claims20
A method for controlling an electric motor driving a hydraulic pump for a battery-powered electric mobile machine, the method comprising:
- receiving one or more command signals for a plurality of hydraulically-driven systems;
- determining a minimum pump speed for each of the plurality of hydraulically-driven systems required to operate the hydraulically-driven system;
- determining a highest minimum pump speed of the minimum pump speeds for the plurality of hydraulically-driven systems;
- converting the highest minimum pump speed to an electric motor command;
- and
- sending the electric motor command to the electric motor.
A control system for a battery-powered electric mobile machine, comprising:
- an electric motor;
- a hydraulic pump driven by the electric motor;
- a plurality of hydraulically-driven systems driven by the hydraulic pump, wherein each hydraulically-driven system has a minimum pump speed required to operate the hydraulically-driven system;
- and
- a controller, wherein the controller is configured to receive one or more command signals, and wherein the controller is configured to determine a highest minimum pump speed of the minimum pump speeds for the plurality of hydraulically-driven systems, and
- wherein the controller is further configured to determine and output a motor command for the electric motor based on the determined highest minimum pump speed.
A battery-powered electric mobile machine, comprising:
- a battery;
- an electric motor powered by the battery;
- a hydraulic pump driven by the electric motor;
- a plurality of hydraulically-driven systems, wherein the plurality of hydraulically-driven systems includes a hydraulic brake system, a hydraulic steering system, a hydraulic implement system, and hydraulic fans, wherein each hydraulically-driven system has a minimum pump speed required to operate the hydraulically-driven system;
- and
- a controller, wherein the controller is configured to receive one or more command signals, determine a highest minimum pump speed of the minimum pump speeds for the plurality of hydraulically-driven systems, convert the highest minimum pump speed to a motor speed, and output a motor command to ramp up or ramp down within predetermined ramping limits.
Dependencies are inferred from the claim text.