Invention Grant
- Patent Title: Load-dependent regulation of hydraulic motors
-
Application No.: US15098872Application Date: 2016-04-14
-
Publication No.: US10364885B2Publication Date: 2019-07-30
- Inventor: Rolf Rathke
- Applicant: Danfoss Power Solutions GmbH & Co. OHG
- Applicant Address: DE Neumunster
- Assignee: Danfoss Power Solutions GmbH & Co. OHG
- Current Assignee: Danfoss Power Solutions GmbH & Co. OHG
- Current Assignee Address: DE Neumunster
- Agency: McCormick, Paulding & Huber LLP
- Priority: DE102015209356 20150521
- Main IPC: F16H61/44
- IPC: F16H61/44 ; F16H61/421 ; F16H61/472 ; F15B11/16 ; F15B13/06 ; F16H39/02 ; F16H47/02

Abstract:
Method for the load-dependent regulation of a hydrostatic drive (1), with a closed hydraulic fluid circuit comprising a first hydraulic motor (5) and, parallel to this, a second hydraulic motor (6), whereby both hydraulic motors (5 and 6) are capable of being powered by a hydraulic pump (3) via a high-pressure line (7) and a low-pressure line (8) and are mechanically coupled to each other via a transmission (70). The displacement of the first hydraulic motor (5) can be adjusted proportionally to an electrical signal of an electronic control system (50) by means of an electro-proportional control valve (10) and the displacement of the second hydraulic motor (6) can be adjusted by means of a pressure-proportional control valve (20) which is hydraulically connected to the high-pressure line (7) via a control pressure line (21). The pressure-proportional control valve can be activated by means of a control pressure which is dependent on the high pressure. By means of automatic opening of the pressure-proportional control valve (20) dependent on the high pressure, proportional to the exceedance of a predefinable pressure limit in the high-pressure line (7), the displacement of the second hydraulic motor (6) is adjusted by means of a second servo control unit which can be controlled via the pressure-proportional control valve (20). By means of the electronic control system (50), the actual volume flow passing through the first hydraulic motor (5) is determined and compared with a target value for the volume flow. Based on a deviation between the actual and target value for the volume flow, the electronic control system (50) calculates an adapted control signal and transmits this to the electro-proportional control valve (10), as a result of which the displacement of the first hydraulic motor (5) is adaptable by means of a first servo control unit (14), which is controlled via the electro-proportional control valve (10).
Public/Granted literature
- US20160341308A1 LOAD-DEPENDENT REGULATION OF HYDRAULIC MOTORS Public/Granted day:2016-11-24
Information query