Patent ID: 9670943
Date: 2017-06-06
CPC Classifications: F15B

Claim:
1. An electro-hydrostatic system comprising: a controller connected to an operator interface; a pump operable in a first direction for supplying pressurized fluid; an electric machine operated by the controller and connected to an electrical source through an inverter to drive the pump; and a hydraulic circuit having a first side fluidly connecting a first side of the pump to a first port for connection to a consumer, and a second side fluidly connecting the second side of the pump to a second port for connection to the consumer; wherein the controller is configured: to receive a user input for controlling the consumer and to supply hydraulic fluid in accordance therewith, to set the first side of the hydraulic circuit pressure limit to a reduced value pressure limit in response to the user input; to watch for a parameter, the parameter being indicative of pressure in the first side of the hydraulic circuit exceeding the reduced value pressure limit, and in response to the parameter indicative of the pressure exceeding the reduced value pressure limit, to restrict pressure in the first side of the hydraulic circuit until the pressure limit is increased, thereby delaying consumer motion unless a command to stop consumer motion is given and mimicking responsiveness in a conventional load-sense system, and to determine to increase the pressure limit based on receipt of the parameter indicative of the pressure exceeding the reduced value pressure limit.