A hydraulic control system is disclosed for use in a machine. The hydraulic control system may have a work tool, a motor configured to swing the work tool, a tank, a pump configured to draw fluid from the tank and pressurize the fluid, and a control valve operable to control fluid flow from the pump
A hydraulic control system is disclosed for use in a machine. The hydraulic control system may have a work tool, a motor configured to swing the work tool, a tank, a pump configured to draw fluid from the tank and pressurize the fluid, and a control valve operable to control fluid flow from the pump to the motor and from the motor to the tank via first and second chamber passages to affect motion of the motor. The hydraulic control system may also have an accumulator, and an accumulator circuit configured to selectively direct fluid discharged from the motor to the accumulator for storage and to direct stored fluid from the accumulator to the motor to assist the motor. The hydraulic control system may further have a selector valve configured to selectively connect a higher pressure one of the first and second chamber passages with the accumulator, and a single pressure relief valve disposed within the accumulator circuit and configured to relief pressure from opposing sides of the motor.
대표청구항▼
1. A hydraulic control system, comprising: a work tool;a motor configured to swing the work tool;a tank;a pump configured to draw fluid from the tank and pressurize the fluid;a control valve operable to control fluid flow from the pump to the motor and from the motor to the tank via first and second
1. A hydraulic control system, comprising: a work tool;a motor configured to swing the work tool;a tank;a pump configured to draw fluid from the tank and pressurize the fluid;a control valve operable to control fluid flow from the pump to the motor and from the motor to the tank via first and second chamber passages to affect motion of the motor;an accumulator;an accumulator circuit configured to selectively direct fluid discharged from the motor to the accumulator for storage and to direct stored fluid from the accumulator to the motor to assist the motor;a selector valve configured to selectively connect a higher pressure one of the first and second chamber passages with the accumulator;a single pressure relief valve disposed within the accumulator circuit and configured to relieve pressure from opposing sides of the motor;a charge valve directly connected to the selector valve and fluidly connected to the accumulator; anda discharge valve directly connected to the selector valve and fluidly connected to the accumulator in parallel with the charge valve,wherein the single pressure relief valve is fluidly connected with each of the accumulator, the charge valve, the discharge valve, and the tank. 2. The hydraulic control system of claim 1, wherein the single pressure relief valve is movable from a first flow-blocking position to a second flow-passing position in response to a pressure of fluid passing through any one of the charge valve, the discharge valve, and the accumulator. 3. The hydraulic control system of claim 1, wherein the single pressure relief valve is configured to selectively connect each of the charge valve, the discharge valve, and the accumulator with the tank in parallel. 4. The hydraulic control system of claim 1, wherein: the accumulator is a first accumulator; andthe hydraulic control system further includes a second accumulator fluidly connected to discharge fluid to the first and second chamber passages via first and second makeup valves. 5. The hydraulic control system of claim 4, wherein the second accumulator is further fluidly connected to receive fluid from the first and second chamber passages. 6. The hydraulic control system of claim 4, wherein the second accumulator is further fluidly connected to the selector valve. 7. The hydraulic control system of claim 6, further including a pressure-actuated valve fluidly connected between the selector valve and the second accumulator. 8. The hydraulic control system of claim 7, wherein the second accumulator is further fluidly connected to the charge and discharge valves via the pressure-actuated valve. 9. The hydraulic control system of claim 4, wherein: the first accumulator is configured to accumulate about 50-100 L of fluid having a pressure of about 260-315 bar; andthe second accumulator is configured to accumulate about 10 L of fluid having a pressure of about 5-30 bar. 10. The hydraulic control system of claim 4, wherein second accumulator is configured to receive fluid from the first accumulator. 11. The hydraulic control system of claim 4, wherein: the motor and the control valve are connected to the pump via a first circuit;the hydraulic control system further includes at least one additional hydraulic actuator and at least one additional control valve connected to the at least one additional hydraulic actuator via a second circuit; andthe first and second accumulators are configured to receive fluid from the second circuit. 12. The hydraulic control system of claim 1, wherein the pump is configured to charge the accumulator when the pump has a capacity of fluid greater than required by the motor. 13. A method of operating a hydraulic control system, comprising: drawing fluid from a tank and pressurizing the fluid with a pump;directing the pressurized fluid from the pump to a motor and from the motor to the tank to drive the motor;selectively directing fluid from the motor to an accumulator including directing pressurized fluid to a selector valve, and directing pressurized fluid directly from the selector valve to a charge valve;selectively directing fluid from the accumulator back to the motor including directing pressurized fluid to a discharge valve, and directing pressurized fluid directly from the discharge valve to the selector valve; andselectively directing fluid from both sides of the motor to the tank via a single relief valve based on a pressure of the fluid. 14. The method of claim 13, wherein: the accumulator is a first accumulator; andthe method further includes directing pressurized fluid from the motor to a second accumulator and from the second accumulator to the motor. 15. The method of claim 14, further including directing pressurized fluid from the first accumulator to the second accumulator. 16. The method of claim 15, further including: storing about 50-100 L of fluid having a pressure of about 260-315 bar in the first accumulator; andstoring about 10 L of fluid having a pressure of about 5-30 bar in the second accumulator. 17. The method of claim 15, wherein: the motor is a first actuator; andthe method further includes directing fluid discharged from a second actuator to the first and second accumulators. 18. The method of claim 17, further including directing fluid from the pump into the first accumulator.
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이 특허에 인용된 특허 (36)
Tabor, Keith A.; Pfaff, Joseph L.; Stephenson, Dwight B., Apparatus for controlling bounce of hydraulically powered equipment.
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