公开(公告)号：US11649609B2

公开(公告)日：2023-05-16

申请号：US17093120

申请日：2020-11-09

Applicant: Caterpillar Inc.

Inventor： Patrick W. Sullivan, Jr. ,  Ryan R. Stoffel ,  Beau D. Kuipers ,  Andrew N. Schifferer ,  Royce E. Leaders ,  Fuaad Sayeed

IPC: E02F9/22 ,  E02F3/43 ,  E02F3/42 ,  F15B13/02 ,  E02F3/28

CPC classification number: E02F9/2228 ,  E02F3/283 ,  E02F3/422 ,  E02F3/431 ,  E02F9/2203 ,  E02F9/2217 ,  E02F9/2267 ,  F15B13/024 ,  E02F9/2285 ,  E02F9/2296

Abstract: A hydraulic system for a machine includes an implement pump, a valve, and an implement valve subsystem. The implement pump includes a load sensing control, and the valve controls the flow of hydraulic fluid to the implement pump. The implement valve subsystem includes one or more implement control subsystems to control movement of an implement. The valve is an electrohydraulic proportional relief valve and includes a solenoid configured to adjust the pressure of hydraulic fluid delivered to the implement pump proportionally to a current delivered through the solenoid.