Load responsive system pump controls
OwnerTadeusz Budzichinventor
Life of this patent
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Abstract
A load responsive fluid power control system using servo type flow control valves and fluid motors supplied by a variable displacement pump. The pump displacement is regulated by an electro-hydraulic control valve in response to an electrical signal proportional to motor load or motor load pressure to vary the pump displacement to maintain a controlled constant or variable pressure differential between the pump outlet pressure and motor load pressure or to vary the pressure differential between pump outlet pressure and motor load pressure in response to a signal from a computing device. The pump control also limits maximum and minimum system pressures.
Claims35
A fluid power and control system comprising a fluid pump, a fluid motor driving a load, and valve means interposed between said pump and said motor to control said load, flow changing means operable to vary fluid flow delivered from said pump to said fluid system to vary pressure in said fluid system, control signal generating means having means to generate an electrical control signal proportional to magnitude of said load, and control means responsive to said electrical control signal having means operable through said flow changing means to control a pressure differential between pressure of said fluid system and pressure necessary to support said load.
A fluid power and control system comprising a fluid pump, a fluid motor driving a load, and valve means interposed between said pump and said motor to control said load, flow changing means operable to vary fluid flow delivered from said pump to said fluid system to vary pressure in said fluid system, first control means having means operable to limit through said flow changing means maximum pressure of said system to a fixed predetermined level, second control means having means operable to limit through said flow changing means minimum pressure of said system to a fixed predetermined level, control signal generating means having means to generate an electrical control signal proportional to magnitude of said load and control means responsive to said electrical control signal having means operable through said flow changing means to control pressure differential between pressure of said fluid system and pressure necessary to support said load.
A fluid power and control system comprising a fluid pump, plurality of fluid motors driving loads, and valve means interposed between said pump and each of said motors to control each load, flow changing means operable to vary fluid flow delivered from said pump to said fluid system to vary pressure in said fluid system, control signal generating means having means to generate an electrical control signal proportional to magnitude of each load, each electrical control signal modifying means, electrical control signal phasing means operable to receive all of said modified electrical control signals and to pass only the highest modified electrical control signal from the highest system load, and control means responsive to said highest modified electrical control signal having means operable through said flow changing means to control pressure differential between pressure of said fluid system and pressure necessary to support said highest system load.
A fluid power and control system comprising a fluid pump, a fluid motor driving a load, and valve means interposed between said pump and said motor to control said load, flow changing means operable to vary fluid flow delivered from said pump to said fluid system to vary pressure in said fluid system, control signal generating means having means to generate an electrical control signal proportional to magnitude of said load, and control means responsive to said electrical control signal having converting means to convert said electrical control signal into proportional pressure signal and means operable through said flow changing means to control a pressure differential between pressure of said fluid system and pressure necessary to support said load.
Dependencies are inferred from the claim text.