CN103615029A - Power control system and method of negative flow hydraulic pump of middle-large size hydraulic excavator - Google Patents
Power control system and method of negative flow hydraulic pump of middle-large size hydraulic excavator Download PDFInfo
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- CN103615029A CN103615029A CN201310528675.9A CN201310528675A CN103615029A CN 103615029 A CN103615029 A CN 103615029A CN 201310528675 A CN201310528675 A CN 201310528675A CN 103615029 A CN103615029 A CN 103615029A
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Abstract
The invention discloses a power control system and method of a negative flow hydraulic pump of a middle-large size hydraulic excavator. The power control system comprises an electric controller, an engine rotating speed sensor, a front pump pressure sensor, a rear pump pressure sensor and a proportional electromagnetic valve. The engine rotating speed sensor is connected with the electric controller to input engine rotating speed signals. The front pump pressure sensor and the rear pump pressure sensor are respectively connected with the electric controller to input front pump pressure signals and rear pump pressure signals. The electric controller is connected with the proportional electromagnetic valve to output proportional electromagnetic valve drive signals. The power control system and method solve the technical problem that the hydraulic pump works in an overload area so that the speed of an engine can be decreased.
Description
Technical field
The present invention relates to a kind of medium-and-large-sized hydraulic crawler excavator, relate in particular to a kind of power control system and method for medium-and-large-sized hydraulic crawler excavator minus flow hydraulic pump, belong to engineering mechanical device technical field.
Background technology
Current medium-and-large-sized hydraulic crawler excavator minus flow hydraulic pump power curve as shown in Figure 1, power curve in figure is constant power curve, the every bit power being illustrated on this curve all equates, each pressure spot is corresponding to the flow of corresponding hydraulic pump under this pressure.
Power match about motor and pump is controlled, traditional method is to allow the absorbed power of pump be slightly less than the power output of motor, the power output of motor is decided by engine power characteristic curve, and the absorbed power of pump is determined by the electric current of the power characteristic of pump and the proportion magnetic valve of control pump, the power characteristic of pump is immutable in working control, can only be by regulating the electric current of electric proportional valve to regulate the absorbed power of pump.So be mainly just embodied in about the control of power match in the Current Control of proportion magnetic valve of pump.
The power of the medium-and-large-sized hydraulic crawler excavator minus flow hydraulic pump of prior art is controlled and is realized by engine speed closed-loop control system, and power match is had to certain limitation.As shown in Figure 1, when pump real work, inevitably can exceed its ideal power curve, be operated in shadow region, at this moment the power of pump can exceed rated power, because motor and hydraulic pump are to be rigidly connected, when overloading, hydraulic pump can cause engine speed to decline, rotary speed unstabilization is fixed, causes oil consumption to increase, and mechanical wear increases.Conventionally the control mode adopting is at present that the anti-current power of pump that pushes away goes electromagnetic valve for adjusting electric current to realize power match again by detecting the variation of engine speed.There is certain hysteresis quality in this control mode, and needs the multicycle to regulate.According to the power curve of pump, analyze, can be understood as and know obviously at shadow region pump and can overload and cause motor to fall speed, and remove to gather the tach signal of motor, and then go the power of taking measures to reduce pump to reach power match, this control mode link lags behind more, can not solve well engine overload and fall fast problem.
Therefore, for the deficiencies in the prior art, study a kind of new power control system and method, it is very necessary that the quick hydraulic pump works of solution in real time causes motor to fall fast technical problem in shadow region overload.
Summary of the invention
The object of the present invention is to provide a kind of power control system and method for medium-and-large-sized hydraulic crawler excavator minus flow hydraulic pump, solve hydraulic pump works and in Over-carry area, cause motor to fall fast technical problem.
Object of the present invention is achieved by the following technical programs:
A power control system for medium-and-large-sized hydraulic crawler excavator minus flow hydraulic pump, comprises electric controller 1, engine speed sensor 2, front pump pressure sensor 3, rear pump pressure sensor 4, proportion magnetic valve 5; Described engine speed sensor 2 is connected with electric controller 1, input engine rotational speed signal; Described front pump pressure sensor 3, rear pump pressure sensor 4 are connected with electric controller 1 respectively, input front pump pressure, rear pump pressure signal; Described electric controller 1 is connected with proportion magnetic valve 5, export ratio solenoid-driven signal.
A control method for the power control system of medium-and-large-sized hydraulic crawler excavator minus flow hydraulic pump, comprising:
Engine output drives hydraulic pump works, hydraulic pump absorbs engine power and externally does work, front pump pressure sensor, rear pump pressure sensor gather front pump pressure signal, rear pump pressure signal, according to hydraulic pump power curve, find corresponding power points, if power points now exceeds the rated power of motor, electric controller regulates proportion magnetic valve electric current to make the translation of hydraulic pump power curve, revise pump power curve to the operating point of perfect condition pump power curve setting, to avoid overpower operation; Engine speed sensor gathers engine rotational speed signal, if motor falls speed, electric controller regulates proportion magnetic valve electric current according to engine rotational speed signal, and proportional solenoid valve control hydraulic pump works, in rated power, reaches the power match of motor and hydraulic pump.
Compared with prior art, the invention has the beneficial effects as follows: the present invention solves hydraulic pump works fast in real time, and in shadow region, overload causes motor to fall fast technical problem, the demand power rotating speed approximate steadily, motor of hydraulic pump is totally more steady, can not overload and cause the fluctuation that engine speed is large.Compare and be not with pressure to control the system of feedforward, due to stabilization of speed, reduce oil consumption 5%, the component abrasion of motor, main pump is less.
Accompanying drawing explanation
Fig. 1 is hydraulic pump actual power curve and ideal power curve comparison figure;
Fig. 2 is systematic schematic diagram of the present invention;
Fig. 3 is the schematic diagram of control method of the present invention;
Fig. 4 be hydraulic pump works in operating point 1 power;
Fig. 5 be hydraulic pump works in operating point 2 powers;
Fig. 6 be hydraulic pump works in operating point 3 power;
Fig. 7 be hydraulic pump works in operating point 4 power.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
As shown in Figure 2, the power control system of medium-and-large-sized hydraulic crawler excavator minus flow hydraulic pump, comprises electric controller 1, engine speed sensor 2, front pump pressure sensor 3, rear pump pressure sensor 4, proportion magnetic valve 5; The engine speed sensor 2 being installed on motor 6 is connected with electric controller 1, input engine rotational speed signal; The front pump pressure sensor 3, the rear pump pressure sensor 4 that are installed on hydraulic pump 7 are connected with electric controller 1 respectively, input front pump pressure, rear pump pressure signal; Described electric controller 1 is connected with proportion magnetic valve 5, export ratio solenoid-driven signal.
As shown in Figure 3, the control method of the power control system of medium-and-large-sized hydraulic crawler excavator minus flow hydraulic pump, comprising:
Engine output drives hydraulic pump works, hydraulic pump absorbs engine power and externally does work, front pump pressure sensor, rear pump pressure sensor gather front pump pressure signal, rear pump pressure signal, according to hydraulic pump power curve, find corresponding power points, if power points now exceeds the rated power of motor, electric controller regulates proportion magnetic valve electric current to make the translation of hydraulic pump power curve, revise pump power curve to the operating point of perfect condition pump power curve setting, to avoid overpower operation; Engine speed sensor gathers engine rotational speed signal, if motor falls speed, electric controller regulates proportion magnetic valve electric current according to engine rotational speed signal, and proportional solenoid valve control hydraulic pump works, in rated power, reaches the power match of motor and hydraulic pump.
As shown in Fig. 4-7, be in the excavator course of work, to adopt the present invention to control hydraulic pump power curve, adjust to respectively the working condition of the operating point 1,2,3,4 of ideal power curve.
In addition to the implementation, the present invention can also have other embodiments, and all employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop in the protection domain of requirement of the present invention.
Claims (2)
1. the power control system of a medium-and-large-sized hydraulic crawler excavator minus flow hydraulic pump, it is characterized in that, comprise electric controller (1), engine speed sensor (2), front pump pressure sensor (3), rear pump pressure sensor (4), proportion magnetic valve (5); Described engine speed sensor (2) is connected with electric controller (1), input engine rotational speed signal; Described front pump pressure sensor (3), rear pump pressure sensor (4) are connected with electric controller (1) respectively, input front pump pressure signal, rear pump pressure signal; Described electric controller (1) is connected with proportion magnetic valve (5), export ratio solenoid-driven signal.
2. the control method of the power control system of medium-and-large-sized hydraulic crawler excavator minus flow hydraulic pump as claimed in claim 1, it is characterized in that, engine output drives hydraulic pump works, hydraulic pump absorbs engine power and externally does work, front pump pressure sensor, rear pump pressure sensor gathers front pump pressure signal, rear pump pressure signal, according to hydraulic pump power curve, find corresponding power points, if power points now exceeds the rated power of motor, electric controller regulates proportion magnetic valve electric current to make the translation of hydraulic pump power curve, revise pump power curve to the operating point of perfect condition pump power curve setting, to avoid overpower operation, engine speed sensor gathers engine rotational speed signal, if motor falls speed, electric controller regulates proportion magnetic valve electric current according to engine rotational speed signal, and proportional solenoid valve control hydraulic pump works, in rated power, reaches the power match of motor and hydraulic pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310528675.9A CN103615029A (en) | 2013-11-01 | 2013-11-01 | Power control system and method of negative flow hydraulic pump of middle-large size hydraulic excavator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310528675.9A CN103615029A (en) | 2013-11-01 | 2013-11-01 | Power control system and method of negative flow hydraulic pump of middle-large size hydraulic excavator |
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| CN103615029A true CN103615029A (en) | 2014-03-05 |
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| CN201310528675.9A Pending CN103615029A (en) | 2013-11-01 | 2013-11-01 | Power control system and method of negative flow hydraulic pump of middle-large size hydraulic excavator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105155610A (en) * | 2015-08-27 | 2015-12-16 | 中国航空工业集团公司西安飞行自动控制研究所 | Power protection control method for hydraulic excavator |
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| CN2837393Y (en) * | 2005-03-25 | 2006-11-15 | 广西柳工机械股份有限公司 | Full power controller for excavator |
| CN101768990A (en) * | 2010-02-06 | 2010-07-07 | 山东众友工程机械有限公司 | Hydraulic constant power control device for excavator |
| CN101818508A (en) * | 2010-04-19 | 2010-09-01 | 三一重机有限公司 | Power control system and method of excavator |
| CN102635137A (en) * | 2011-02-12 | 2012-08-15 | 上海派芬自动控制技术有限公司 | Total power control system of mechanical equipment |
| CN203546805U (en) * | 2013-11-01 | 2014-04-16 | 中外合资沃得重工（中国）有限公司 | Power control system of negative flow hydraulic pump of medium-large-size hydraulic excavator |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US4337587A (en) * | 1980-04-14 | 1982-07-06 | Presley Glen T | Vehicle power control system |
| CN2837393Y (en) * | 2005-03-25 | 2006-11-15 | 广西柳工机械股份有限公司 | Full power controller for excavator |
| CN101768990A (en) * | 2010-02-06 | 2010-07-07 | 山东众友工程机械有限公司 | Hydraulic constant power control device for excavator |
| CN101818508A (en) * | 2010-04-19 | 2010-09-01 | 三一重机有限公司 | Power control system and method of excavator |
| CN102635137A (en) * | 2011-02-12 | 2012-08-15 | 上海派芬自动控制技术有限公司 | Total power control system of mechanical equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105155610A (en) * | 2015-08-27 | 2015-12-16 | 中国航空工业集团公司西安飞行自动控制研究所 | Power protection control method for hydraulic excavator |
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Application publication date: 20140305 |