Patents by Inventor Hoenghwan AHN
Hoenghwan AHN has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11840824Abstract: Provided is a hydraulic machine. A pump pressurizes fluid using power provided by a power source. An actuator works using the pressurized fluid from the pump. A recovery part recovers energy from fluid discharged from the actuator. A first operator input device receives a desired input from operator to select an eco-mode or a boost mode. The recovery part includes an accumulator storing hydraulic energy by receiving the fluid discharged from the actuator and an assist unit assisting the power source using the hydraulic energy stored in the accumulator. The controller controls the pump such that output power of the pump does not exceed P1max when the eco-mode is selected or the assist unit does not assist the power source and that the output power does not exceed P2max when the boost mode is selected and the assist unit assists the power source, where P1max<P2max.Type: GrantFiled: December 13, 2022Date of Patent: December 12, 2023Assignee: VOLVO CONSTRUCTION EQUIPMENT ABInventors: Seonggeun Yun, Byoungho Lee, Hoenghwan Ahn, Sangkyu Joo, Seunghyun Lee, Taerang Jung
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Publication number: 20230203785Abstract: Provided is a hydraulic machine. A pump pressurizes fluid using power provided by a power source. An actuator works using the pressurized fluid from the pump. A recovery part recovers energy from fluid discharged from the actuator. A first operator input device receives a desired input from an operator to select an eco-mode or a boost mode. The recovery part includes an accumulator storing hydraulic energy by receiving the fluid discharged from the actuator and an assist unit assisting the power source using the hydraulic energy stored in the accumulator. The controller controls the pump such that output power of the pump does not exceed Plmax when the eco-mode is selected or the assist unit does not assist the power source and that the output power does not exceed P2max when the boost mode is selected and the assist unit assists the power source, where Plmax < P2max.Type: ApplicationFiled: December 13, 2022Publication date: June 29, 2023Inventors: Seonggeun YUN, Byoungho LEE, Hoenghwan AHN, Sangkyu JOO, Seunghyun LEE, Taerang JUNG
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Patent number: 11598354Abstract: A hydraulic machine. A boom actuator includes a large chamber and a small chamber. A recovery unit receives fluid discharged from the large chamber and then recovers energy. A recovery line connects the large chamber and the recovery unit. An accumulator is connected to a first point on the recovery line. A discharge valve is disposed on the recovery line between the first point and the recovery unit. A first sensor measures a pressure in the accumulator. A controller controls opening and closing of the discharge valve. The controller performs anti-bouncing control of: determining a target pressure in the accumulator corresponding to a load pressure applied to fluid in the large chamber by a load according to a predetermined correspondence; and controlling the opening and closing of the discharge valve such that the pressure in the accumulator measured by the first sensor reaches the target pressure.Type: GrantFiled: May 13, 2022Date of Patent: March 7, 2023Assignee: Volvo Construction Equipment ABInventors: Taerang Jung, Sangkyu Joo, Hoenghwan Ahn, Seonggeun Yun, Seunghyun Lee, Byoungho Lee
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Patent number: 11542684Abstract: A hydraulic machine is provided. A boom actuator includes a large chamber and a small chamber. A recovery unit receives fluid discharged from the large chamber and then recovers energy. A recovery line connects the large chamber and the recovery unit. An accumulator is connected to the recovery line. A jack-up assist line connects the accumulator and the small chamber. A jack-up assist valve is disposed on the jack-up assist line to block flow of fluid from the accumulator to the small chamber in a first position and allow the flow of fluid from the accumulator to the small chamber in a second position. A controller controls movement of the jack-up assist valve. The controller may determine whether or not the hydraulic machine is in a jack-up condition, and when the hydraulic machine is determined to be in the jack-up condition, moves the jack-up assist valve to the second position.Type: GrantFiled: May 10, 2022Date of Patent: January 3, 2023Assignee: VOLVO CONSTRUCTION EQUIPMENT ABInventors: Hoenghwan Ahn, Taerang Jung, Sangkyu Joo, Seonggeun Yun, Seunghyun Lee, Byoungho Lee
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Publication number: 20220364327Abstract: A hydraulic machine is provided. A boom actuator includes a large chamber and a small chamber. A recovery unit receives fluid discharged from the large chamber and then recovers energy. A recovery line connects the large chamber and the recovery unit. An accumulator is connected to the recovery line. A jack-up assist line connects the accumulator and the small chamber. A jack-up assist valve is disposed on the jack-up assist line to block flow of fluid from the accumulator to the small chamber in a first position and allow the flow of fluid from the accumulator to the small chamber in a second position. A controller controls movement of the jack-up assist valve. The controller may determine whether or not the hydraulic machine is in a jack-up condition, and when the hydraulic machine is determined to be in the jack-up condition, moves the jack-up assist valve to the second position.Type: ApplicationFiled: May 10, 2022Publication date: November 17, 2022Inventors: Hoenghwan AHN, Taerang JUNG, Sangkyu JOO, Seonggeun YUN, Seunghyun LEE, Byoungho LEE
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Publication number: 20220364328Abstract: A hydraulic machine. A boom actuator includes a large chamber and a small chamber. A recovery unit receives fluid discharged from the large chamber and then recovers energy. A recovery line connects the large chamber and the recovery unit. An accumulator is connected to a first point on the recovery line. A discharge valve is disposed on the recovery line between the first point and the recovery unit. A first sensor measures a pressure in the accumulator. A controller controls opening and closing of the discharge valve. The controller performs anti-bouncing control of: determining a target pressure in the accumulator corresponding to a load pressure applied to fluid in the large chamber by a load according to a predetermined correspondence; and controlling the opening and closing of the discharge valve such that the pressure in the accumulator measured by the first sensor reaches the target pressure.Type: ApplicationFiled: May 13, 2022Publication date: November 17, 2022Inventors: Taerang Jung, Sangkyu Joo, Hoenghwan Ahn, Seonggeun Yun, Seunghyun Lee, Byoungho Lee