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：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.