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Control system of hydrautic pump

A technology of hydraulic pump and control performance, applied in the field of hydraulic pump, can solve problems such as poor control stability of NFP

Inactive Publication Date: 2008-02-27
丹佛斯动力系统有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for certain types of vehicles, these features are likely to be disadvantages
Especially for vehicles that require constant speed (that is, vehicles that require a constant swash plate position), drag-free performance, responsiveness independent of vehicle load and when using microprocessor-based prevention that detects engine speed For stalled system applications, these characteristics become disadvantages
In addition, NFP control is generally less stable than DFC due to the lack of compensation provided by the feedback mechanism

Method used

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  • Control system of hydrautic pump
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  • Control system of hydrautic pump

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Embodiment Construction

[0026] It is a general object of this invention to control the slope and spacing of the torque curve as a function of speed, system pressure and swash plate angle. This control includes (1) reducing the dependence of the swash plate angle on non-input signal parameters (ie: system pressure and speed); (2) increasing the dependence of the swash plate angle on the input signal; (3) ensuring that the overall operation of the vehicle The stability of speed, pressure and swash plate angle within the range; (4) reduce the vibration and noise of the swash plate in items (1)-(3).

[0027] The above objectives are achieved by combining various known control concepts, fine-tuning some or all of the concepts within certain parameters, which will be described in detail below. Through these concepts a control system is formed which can control the hydraulic transmission to have a control performance similar to that of the DFC system.

[0028] See Figure 1. A hydraulic transmission 10 for...

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Abstract

A non-feedback proportional system is provided to achieve desired operating characteristics which will allow the control of a hydrostatic transmission to closely approximate the control performance of a displacement feedback control system by establishing certain parameters relating to (1) the servo spring rate; (2) the valve plate index; (3) valve plate crossport / trap; (4) valve plate porting geometry; (5) swashplate offset; and (6) piston bore volume.

Description

(1) Technical field [0001] The present invention relates to hydraulic pumps, in particular to a method of controlling a hydraulic pump. (2) Background technology [0002] Displacement feedback control systems (DFCs) and non-feedback proportional systems (NFPs) have previously been used in axial piston hydraulic pumps. The two control block diagrams A and B shown in Figures 16 and 17 illustrate the difference between feedback (DFC) and non-feedback (NFP) control systems. [0003] The control of the pump necessarily involves the control of the position of the pump's swash plate. In the DFC control mechanism, the position of the swash plate is only a function of the input signal, which can be manual, electric or hydraulic input signal. DFC utilizes a mechanical feedback coupling to control the position of a servo piston and swash plate system proportional to the input signal. In the NFP control mechanism, the position of the swash plate is a function of the input signal and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04B49/03F04B1/12F04B49/00F04B1/20F04B1/22F04B1/26F04B1/32F16H61/42F16H61/431F16H61/46
CPCF04B1/324F16H61/46F16H61/431F04B1/2042
Inventor 斯蒂芬C·弗朗茨香农D·卡弗克雷格C·克勒克丹尼斯M·格林
Owner 丹佛斯动力系统有限公司
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