ELECTRO-HYDROSTATIC ACTUATOR DECELERATION RATE CONTROL SYSTEM

摘要

Presented is a system and method to control hydraulic fluid flow, more specifically throttle hydraulic fluid flow, to achieve actuator deceleration rates greater than the maximum deceleration rate of an electrically driven pump. Electric machines and electric machine inverters generally have a maximum torque and current limit beyond which they cannot be operated at. To decelerate a large inertia load for example, high electric machine torque and inverter current are required to provide the braking torque, opposing the fluid flow and pressure generated by the load and hydraulic system.

主权项

1. A hydraulic system comprising:
a controller connected to an operator interface; a first load holding valve operatively connected to the controller; a pump operable in a first direction for supplying pressurized fluid through the first load holding valve, the pump operatively connected to the controller; wherein the controller is configured to receive a requested actuator deceleration, to compare the requested actuator deceleration with a predetermined threshold, and to control the first load holding valve to close, causing actuator deceleration equal to the requested actuator deceleration, if it is determined that the requested deceleration is above the predetermined threshold, and to control the pump to cause actuator deceleration equal to the requested actuator deceleration if it is determined that the requested deceleration is not above the predetermined threshold.