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Device and method for controlling a hydraulic machine

A technology for controlling valves and hydraulic pumps, which is applied in the field of hydraulic machinery, can solve the problems of reducing the total efficiency factor of hydraulic machinery, failure to use closed loops, hydraulic energy loss, etc., to achieve increased displacement volume, reliable and stable control, and better control. Effect

Active Publication Date: 2018-06-01
DANFOSS POWER SOLUTIONS GMBH & CO
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Additionally, the pressure fluid discharged through the servo displacement unit is usually discharged directly into the tank and thus cannot be used for the preferred closed circuit
Furthermore, this branching of high-pressure fluid from the circuit implies a loss of hydraulic energy
Further losses come from the inevitable leakage in the control system of hydraulic machinery. The higher the pressure of the corresponding control system, the greater the leakage of course
These losses reduce the overall efficiency factor of the hydraulic machinery

Method used

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  • Device and method for controlling a hydraulic machine
  • Device and method for controlling a hydraulic machine
  • Device and method for controlling a hydraulic machine

Examples

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Embodiment Construction

[0031] figure 1 The control current I for the proportional controlled hydraulic motor is shown as an example propM form and for hydraulic motors with 2-point control and displacement transducers with I 2pktM form the timing of the control signals for the actuator. The hydraulic motor is realized, for example, of the bent-axis or swash-plate type. The control current controls the control valve to vary the displacement angle setting by means of an exemplary selected actuator of the axial piston hydraulic motor. at time point t 1 to t 4 , the adjustment of the displacement angle α is performed for both hydraulic motors with a relatively low control current and by applying hydraulic fluid from the low pressure line. Accordingly, the change runs flat, where at time t 1 and t 2 between and t 3 to t 4 The displacement angles between them experience rise and fall, respectively.

[0032] at time point t 5 , a higher control signal is set whereby, in addition to the control v...

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Abstract

The present invention relates to a hydraulic machine and in particular to a hydraulic motor having two working lines, a high pressure line branching off from one working line and a low pressure line branching off from the other working line. An electronic control unit and a servo displacement unit are provided to control displacement of a displacement capacity of the hydromechanical drive mechanism, wherein the displacement capacity may be determined by displacement of a servo plunger within the servo displacement unit. For this purpose, the servo plunger can be acted on at least one side via a servo pressure line with hydraulic fluid under servo pressure, wherein the servo pressure level can be adjusted by a control plunger movably arranged in the control valve. For this, hydraulic fluid from the low pressure line or perhaps hydraulic fluid from the high pressure line can be directed to the servo pressure line via the control valve, if a suitable control signal is available at the switching valve.

Description

technical field [0001] The invention relates to a hydraulic machine, such as a hydraulic motor, which is operated by means of two lines leading hydraulic fluid, in particular by means of a high-pressure line and a low-pressure line. The displacement volume of the hydromechanical drive is adjustable in a controlled manner by means of the control unit, the control valve and the servo displacement unit; thus the displacement volume can be determined by the displacement of the servo piston in the servo displacement unit. For this purpose, hydraulic fluid under servo pressure is supplied to the servo displacement unit via a servo pressure line and a control plunger arranged movable within a control valve, so that the servo displacement unit can adjust the displacement of the hydraulic machine in a controlled manner volume. Background technique [0002] A universal hydraulic machine adjustable in this way is known, for example, from DE 3307570 A1. In this document, a hydraulic m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F15B11/02
CPCF15B11/02F15B2211/20546F16H61/421F16H61/423F04B1/34F15B2211/763F16H61/4017F16H61/4026F15B2211/251F15B2211/252
Inventor 苏恩洁·马希伯尔尼·黑姆斯迈克尔·海因安·斯特布劳
Owner DANFOSS POWER SOLUTIONS GMBH & CO
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