公开(公告)号：US11566642B2

公开(公告)日：2023-01-31

申请号：US17303465

申请日：2021-05-28

Applicant: Danfoss Power Solutions II Technology A/S

Inventor： Meng (Rachel) Wang ,  Michael Berne Rannow

IPC: F15B21/00 ,  F15B11/044 ,  B66C13/06 ,  E02F9/22 ,  F15B11/00 ,  E04G21/04 ,  F16F15/023 ,  F16F15/027

Abstract: A hydraulic system (600) and method for reducing boom dynamics of a boom (30), while providing counter-balance valve protection, includes a hydraulic actuator (110), first and second counter-balance valves (300, 400), first and second control valves (700, 800), and first and second blocking valves (350, 450). A net load (90) is supported by a first chamber (116, 118) of the hydraulic actuator, and a second chamber (118, 116) of the hydraulic actuator may receive fluctuating hydraulic fluid flow from the second control valve to produce a vibratory response (950) that counters environmental vibrations (960) on the boom. The first blocking valve prevents the fluctuating hydraulic fluid flow from opening the first counter-balance valve. The first blocking valve may drain leakage from the first counter-balance valve.

公开(公告)号：US20230075340A1

公开(公告)日：2023-03-09

申请号：US18054654

申请日：2022-11-11

Applicant: DANFOSS POWER SOLUTIONS II TECHNOLOGY A/S

Inventor： Michael Berne Rannow ,  Vishal Vijay Mahulkar

IPC: E02F9/22

Abstract: A system and method for the controlled lowering and lifting of a load are disclosed. The system and method may include operating a work machine having a hydraulic system including a hydraulic actuator for supporting a load, a first control valve in fluid communication with the actuator, and a controller for operating the first control valve. In one embodiment, the controller includes a first algorithm for operating the first control valve in a load lowering operation. When an operational fault within the hydraulic system is detected, the controller can be configured to enter into a safe lowering mode. In the safe lowering mode, the first algorithm is disabled and a pulse width modulation (PWM) current is sent from the controller to the first control valve. A user interface is provided to allow an operator to control the PWM current duty ratio to allow the load supported by the actuator to be lowered.

公开(公告)号：US11566399B2

公开(公告)日：2023-01-31

申请号：US16740682

申请日：2020-01-13

Applicant: DANFOSS POWER SOLUTIONS II TECHNOLOGY A/S

Inventor： Michael Berne Rannow ,  Vishal Vijay Mahulkar

IPC: F15B19/00 ,  E02F9/22 ,  E02F9/24 ,  F15B11/15 ,  F15B20/00

Abstract: A system and method for the controlled lowering and lifting of a load are disclosed. The system and method may include operating a work machine having a hydraulic system including a hydraulic actuator for supporting a load, a first control valve in fluid communication with the actuator, and a controller for operating the first control valve. In one embodiment, the controller includes a first algorithm for operating the first control valve in a load lowering operation. When an operational fault within the hydraulic system is detected, the controller can be configured to enter into a safe lowering mode. In the safe lowering mode, the first algorithm is disabled and a pulse width modulation (PWM) current is sent from the controller to the first control valve. A user interface is provided to allow an operator to control the PWM current duty ratio to allow the load supported by the actuator to be lowered.

公开(公告)号：US11326627B2

公开(公告)日：2022-05-10

申请号：US16938221

申请日：2020-07-24

Applicant: DANFOSS POWER SOLUTIONS II TECHNOLOGY A/S

Inventor： Michael Berne Rannow ,  Meng Wang

IPC: F15B11/00 ,  E02F9/22 ,  B66C13/06 ,  E04G21/04 ,  F15B11/044

Abstract: A hydraulic system (600) and method for reducing boom dynamics of a boom (30), while providing counter-balance valve protection, includes a hydraulic cylinder (110), first and second counter-balance valves (300, 400), and first and second control valves (700, 800). A net load (90) is supported by a first chamber (116, 118) of the hydraulic cylinder, and a second chamber (118, 116) of the hydraulic cylinder may receive fluctuating hydraulic fluid flow from the second control valve to produce a vibratory response (950) that counters environmental vibrations (960) on the boom. The first control valve may apply a holding pressure and thereby hold the first counter-balance valve closed and the second counter-balance valve open.

公开(公告)号：US11286642B2

公开(公告)日：2022-03-29

申请号：US16388546

申请日：2019-04-18

Applicant: Danfoss Power Solutions II Technology A/S

Inventor： Per William Danzl ,  Michael Berne Rannow ,  Meng Wang ,  Chad Anthony Larish

IPC: E02F9/22 ,  B60K25/06 ,  B60K25/00 ,  E02F9/20 ,  B60K25/02

Abstract: An energy conserving hydraulic system for a mobile work machine includes a prime mover, a drivetrain, a baseline hydraulic system, a power-take-off, a transformer, a work implement, and an accumulator. The drivetrain may include an automated manual transmission (AMT) that is rotationally coupled to the prime mover and the power-take-off. The baseline hydraulic system is powered by the prime mover and includes a first hydraulic circuit. The transformer is hydraulically coupled to second and third hydraulic circuits. The work implement is actuated by an actuator that is adapted to be simultaneously hydraulically coupled to the first and the second hydraulic circuits. The power-take-off is adapted to exchange shaft power with the transmission. A clutch selectively rotationally couples the transmission and the power-take-off. The accumulator is hydraulically coupled to the second hydraulic circuit. The second hydraulic circuit is hydraulically coupled to a first rotating group of the hydraulic transformer, and a third hydraulic circuit is hydraulically coupled to a second rotating group of the hydraulic transformer.