CN101624941A - Energy-saving control method of engineering machinery and constant-resistance moment energy-saving control system of diesel with pressure sense and discharge capacity direct compensation - Google Patents
Energy-saving control method of engineering machinery and constant-resistance moment energy-saving control system of diesel with pressure sense and discharge capacity direct compensation Download PDFInfo
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Abstract
The invention discloses an energy-saving control method of engineering machinery and a constant-resistance moment energy-saving control system of a diesel with pressure sense and discharge capacity direct compensation, aiming at controlling the constant resistance moment of the resistance moment of an output shaft of the diesel causing the rotation speed of the diesel to change. A constant resistance moment controller of the diesel with pressure sense and discharge capacity direct compensation is arranged between an output port of a hydraulic pump and a main pump discharge capacity control mechanism. In the controller, a plurality of work curves of the constant resistance moment of the diesel (the main pump) are pre-stored. The controller automatically controls the discharge capacity of the main pump which correspondingly and regularly changes according to the constant resistance moment when the load change causes the pressure of an outlet of the main pump to change so as to compensate the pressure change and maintain the constant resistance moment of the diesel, therefore, the invention has the advantage of good energy-saving effect.
Description
Technical field
The present invention relates to a kind of energy-saving control method of engineering machinery and pressure sense and discharge capacity direct compensation constant-resistance moment energy-saving control system of diesel with, belong to the Energy Saving Control of engineering machinery.
Background technique
During engineering machinery work, outer load sharply significantly rises and falls, and causes diesel engine output shaft resisting moment, rotating speed fluctuation, is to make the main cause that the diesel engine real output reduces, fuel consumption increases.Keeping diesel engine speed stable, is the common recognition of engineering machinery power match Energy Saving Control.Current engineering machinery Energy Saving Control is an example with the excavator, mainly carries out aspect two.The one, the Energy Saving Control mode of diesel engine and main pump link mainly is the control of artificial selection power divided working status.According to the difference of operating mode basis of characterization in the working procedure, can be divided into the diesel engine speed induction electronics energy-saving control system of present widespread usage and the pressure (power) that possesses some special knowledge in theory and respond to two types of electronics energy-saving control systems.The 2nd, the Energy Saving Control of hydraulic system inside.
Rotating speed induction electronics energy-saving control system energy-saving principle is: when engineering machinery is worked under certain dynamic mode, constantly detect the actual speed of diesel engine, and compare with diesel engine rotating speed of target under this pattern of being stored in the controller, if the difference of actual speed and rotating speed of target within the specific limits, think that then diesel load mates; If speed discrepancy reaches certain numerical value, diesel engine overload (underload) is described, then reduce (increase) hydraulic pump discharge to reduce the load of (increase) diesel engine, near diesel engine speed returns to rotating speed of target by corresponding mechanism.From rotating speed induction energy saving control system energy-saving principle as can be seen, this system itself be exactly one with the conflicting to a great extent theory of energy-conservation requirement: have only after detecting diesel engine output shaft rotation speed change and reaching certain numerical value, ability to diesel engine load regulate.In addition, utilize diesel engine speed to change, also have the not high problem of real-time as the engineering machinery load basis of characterization.So engineering machinery rotating speed induction electronics energy-saving control system can only be realized power match to a certain degree, can not fundamentally realize the Energy Saving Control of engineering machinery.This also is the not really tangible reason of current engineering machinery machine energy-saving effect why.
Pressure (power) induction electronics energy-saving control system, basis of characterization is that the oil pump outlet pressure changes automatically.According to recognition result and certain control strategy, directly regulate diesel engine throttle position and hydraulic pump discharge automatically.Utilize pressure P to carry out the engineering machinery Energy Saving Control, faster, real-time than adopting rotation speed n to carry out control response speed.But this control system is directly just regulated diesel engine throttle aperture and hydraulic pump discharge according to hydraulic system pressure P.Regulate accelerator open degree and just be equivalent to regulate diesel engine speed, the result is that diesel engine speed changes along with the variation of outer load.Obviously, this will make the diesel engine speed fluctuation more violent, and energy loss is bigger.And for diesel engine, in the real work, frequently changing throttle position can not fine solution diesel engine output power and the matching problem of load, is unfavorable for the diesel engine stable operation on the contrary, makes energy consumption even more serious on the contrary, even influences the diesel engine life-span.In addition, the diesel powered system is a Correction for Large Dead Time System, and accelerator open degree is regulated and the pump displacement adjusting can not keep therefore, adopting this control system can not reach the energy-conservation purpose of expection synchronously.This energy-saving control system is not used in practice.
The Energy Saving Control mode of hydraulic system inside to engineering machinery successively can effect influence.Construction machinery hydraulic system generally all adopts several energy-saving control systems simultaneously, as the control of permanent power, just/and minus flow control, load sensing controlled, pressure cut off control etc.The permanent power and variable pump control system of all traditional engineering machinery is to suppose under the constant prerequisite of diesel engine speed theoretic permanent power control system at present.On way of realization, adopt control structures such as complex spring or proportion electro-magnet and permanent power adjustments spring more, come the approximate permanent power adjustments that realizes, permanent power adjustments precision is low; The main pump performance is one or some the approximate constant power hyperbolas that are made of the Different Slope straight line, shown in accompanying drawing 3,4,5.Before the excacation, the permanent power control curve under the at first selected specified power pattern.In the excacation process, the control of permanent power is the limiting constraint of hydraulic system pressure and flow parameter under the selected permanent power curve.Have only when pumping pressure and flow product reach setting power, permanent power control is just worked, and owing to rotating speed changes, essence is approximately the constant-resistance Torque Control.When pressure and flow product did not reach power constraint, permanent power control was inoperative, and diesel engine resisting moment, rotating speed change with outer load variations, and fuel consumption increases.Under other control modes, the diesel engine resisting moment all changes with load variations.
Application number is 200510200185.1, publication number be CN1651665A announce by name: " engineering machinery full power control system and method ", its energy-saving principle remain based on rotating speed induction electronics energy-saving control system.With the difference of traditional rotating speed induction electronics energy-saving control system be, at oil hydraulic pump outlet having increased feed-forward and feedback regulator, improved control algorithm, adopt two-dimentional FUZZY ALGORITHMS FOR CONTROL that main pump pressure and main pump minus flow pressure are carried out computing, adopt pid algorithm that diesel engine speed is detected data and carry out computing, two kinds of algorithm output superposition rear driving as a result electro-hydraulic proportional valves are regulated pump displacement and are regulated to reach power match.Because the basic energy-saving principle of this control system is not broken through, therefore still can not reach truly energy-conservation.
Summary of the invention
Purpose of the present invention is exactly at the deficiency that exists in the prior art, and a kind of energy-saving control method of engineering machinery is provided, and realizes Energy Saving Control truly.
Another object of the present invention provides a kind of pressure sense and discharge capacity direct compensation constant-resistance moment energy-saving control system of diesel with, adopts electronic control mode to replace mechanical control method.Can control guarantee under each operating mode, realize that diesel engine constant-resistance moment, permanent rotating speed, output-constant operation and output power are absorbed by oil hydraulic pump fully, have realized truly to energy-conservation.Simultaneously, by crossing diesel engine is carried out the constant-resistance Torque Control, can diesel engine resisting moment coupling be improved in the position on its characteristic curve even mate near the peak output moment of torsion, reduce diesel engine antioverloading torque reserve, give full play to the power character and the Economy of diesel engine, and needn't worry that the diesel engine overload is flame-out.Satisfy environmental requirement simultaneously.
Keeping diesel engine speed stable, should be to keep the diesel engine resisting moment stable.Diesel engine is under the constant-resistance moment loading, and rotating speed will remain constant.The starting point of this energy-conservation control system invention is exactly to causing that the diesel engine resisting moment that diesel engine speed changes carries out the constant-resistance Torque Control.
Energy Saving Control principle of the present invention: the relation between diesel engine resisting moment M and hydraulic system pressure P and the pump displacement Vb is:
M＝P×Vb；
Therefore, diesel engine is carried out the constant-resistance Torque Control, curve law changes to need pump displacement Vb to change automatically in inverse ratio with pressure P, promptly when the pressure P excursion is in pump displacement Vb regulation range, the variation of the hydraulic system pressure P that is caused by load variations can be from pump displacement Vb automatically by being compensated the adjustment of permanent torque rule.At this moment, the main pump characteristic curve as shown in Figure 2, by formula (1) as can be known, main pump and diesel engine are real constant-resistance M curves.
Concrete technological scheme of the present invention is: a kind of energy-saving control method of engineering machinery, it is characterized in that by diesel engine is carried out the constant-resistance Torque Control, diesel engine resisting moment coupling improved in the position on its characteristic curve in addition coupling near the peak output moment of torsion, to reduce diesel engine antioverloading torque reserve, it is not flame-out to reach maximum power character of diesel engine performance and Economy, specifically:
1) the main pump outlet pressure is detected, testing result is delivered to pressure sense and discharge capacity direct compensation diesel engine constant-resistance moment electric energy-saving controller;
2) pressure sense and discharge capacity direct compensation diesel engine constant-resistance moment electric energy-saving controller is according to the main pump outlet pressure, according to selected constant-resistance moment variations rule, carry out data processing, output discharge capacity control signal driving main pump displacement control mechanism and main pump discharge capacity stroking mechanism, the main pump discharge capacity is adjusted.
A kind of pressure sense and discharge capacity direct compensation constant-resistance moment energy-saving control system of diesel with, it is characterized in that comprising that being arranged on main pump exports the pressure transducer that is used to detect the main pump outlet pressure, pressure sense and discharge capacity direct compensation diesel engine constant-resistance moment electric energy-saving controller, described pressure transducer is connected with described controller; Also comprise and be used for pump displacement stroking mechanism and pump displacement control mechanism that pump delivery is adjusted, pump displacement stroking mechanism and pump displacement control mechanism are connected on main pump successively and discharge capacity is regulated between the pump, and the pump displacement control mechanism also is connected with the output terminal of pressure sense and discharge capacity direct compensation diesel engine constant-resistance moment electric energy-saving controller; Pressure sense and discharge capacity direct compensation diesel engine constant-resistance moment electric energy-saving controller carries out data processing, output discharge capacity control signal driven pump displacement control mechanism according to the main pump outlet pressure and the constant-resistance moment variations rule of input, and the main pump discharge capacity is adjusted.In pressure sense and discharge capacity direct compensation diesel engine constant-resistance moment electric energy-saving controller, according to each operating mode power character or Economy requirement, store some diesel engine constant-resistance moment working curves in advance, i.e. main pump outlet pressure and the main pump discharge capacity working curve of relationship change in inverse ratio.
Advantage of the present invention is: pressure sense and discharge capacity direct compensation diesel engine constant-resistance moment electric energy-saving control system on energy-saving principle, is better than rotating speed induction electronics energy-saving control system and pressure (power) induction electronics energy-saving control system., realize the constant-resistance moment of main pump and diesel engine, permanent rotating speed, output-constant operation and output power are absorbed by oil hydraulic pump fully sharply significantly under the situation of change at load resistance.Realized truly energy-conservation.In addition, by diesel engine is carried out the constant-resistance Torque Control, can diesel engine resisting moment coupling be improved in the position on its characteristic curve even mate near the peak output moment of torsion, can reduce diesel engine antioverloading torque reserve, give full play to the power character and the Economy of diesel engine.And needn't worry that the diesel engine overload is flame-out.And compliance with environmental protection requirements.Simultaneously controller this also can utilize other Energy Saving Control modes of hydraulic system, and information such as diesel engine speed, throttle position exceed pump displacement V to the pressure P value
bThe complex working condition of regulation range carries out Comprehensive Control, to keep diesel engine stable operation as far as possible.
Description of drawings
Fig. 1 is a principle schematic of the present invention;
Fig. 2 is a main pump performance curve of the present invention;
Fig. 3 is the permanent power controlled hydraulic system main pump characteristic curve of complex spring control;
Fig. 4 is the permanent power controlled hydraulic system main pump characteristic curve of proportion electro-magnet control;
Fig. 5 is the spring controlled permanent power controlled hydraulic system main pump characteristic curve of permanent power adjustments.
Embodiment
As shown in Figure 1, diesel engine output shaft and pump shaft are rigid connection.Also can connect through driving mechanism.Pressure sense and discharge capacity direct compensation diesel engine constant-resistance moment electric energy-saving control system includes:
1, two main pump pressure transducers: i.e. pressure transducer P1 and pressure transducer P2, detect the main pump outlet pressure;
2, pump displacement stroking mechanism and pump displacement control mechanism are adjusted pump displacement.Displacement control mechanism can be electro-hydraulic proportional reducing valve, and the pump displacement control mechanism is a variable cylinder;
3, between main pump outlet and main pump stroking mechanism, be connected with pressure sense and discharge capacity direct compensation diesel engine constant-resistance moment electric energy-saving controller.This controller is a microprocessor or computer, according to each operating mode power character or Economy requirement, stores some diesel engine constant-resistance moment working curves in advance, and promptly main pump outlet pressure and main pump discharge capacity are by the working curve of hyperbolic relation variation.
During work, selecting suitable mode of operation by the concrete operating mode of artificial basis, job requirement, is to select the match point of resisting moment on its characteristic curve to diesel engine, and promptly driving moment is to select constant-resistance moment work hyperbola for oil hydraulic pump.During excavation, change by corresponding constant-resistance moment work hyperbola according to the automatic control pump discharge capacity of variation in pressure by the constant-resistance torque controller.
Concrete controlling method is:
(1) pressure transducer P1 and pressure transducer P2 detect the main pump outlet pressure, and testing result is delivered to pressure sense and discharge capacity direct compensation diesel engine constant-resistance moment electric energy-saving controller;
(2) pressure sense and discharge capacity direct compensation diesel engine constant-resistance moment electric energy-saving controller is according to the main pump outlet pressure, according to selected constant-resistance moment variations rule, carry out data processing, output discharge capacity control signal, the size of the control electric current of real time altering pump displacement control mechanism (as electro-hydraulic proportional reducing valve), to change the output flow of displacement control mechanism (electro-hydraulic proportional reducing valve), and then the stroking mechanism of control main pump, make main pump discharge capacity generation respective change.
As can be seen from Figure 2, this electric energy-saving system system can realize that main pump and diesel engine constant-resistance Torque Control, permanent rotating speed, output-constant operation and the output power under the full operating mode absorbed by oil hydraulic pump fully, realized truly to energy-conservation.In addition, by diesel engine is carried out the constant-resistance Torque Control, can diesel engine resisting moment coupling be improved in the position on its characteristic curve even mate near the peak output moment of torsion, can reduce diesel engine antioverloading torque reserve, give full play to the power character and the Economy of diesel engine.And needn't worry that the diesel engine overload is flame-out.Simultaneously satisfy environmental requirement.
Claims (3)
1, a kind of energy-saving control method of engineering machinery, it is characterized in that by diesel engine is carried out the constant-resistance Torque Control, diesel engine resisting moment coupling improved in the position on its characteristic curve in addition coupling near the peak output moment of torsion, to reduce diesel engine antioverloading torque reserve, it is not flame-out to reach maximum power character of diesel engine performance and Economy, specifically:
1) the main pump outlet pressure is detected, testing result is delivered to pressure sense and discharge capacity direct compensation diesel engine constant-resistance moment electric energy-saving controller;
2) pressure sense and discharge capacity direct compensation diesel engine constant-resistance moment electric energy-saving controller is according to the main pump outlet pressure, according to selected constant-resistance moment variations rule, carry out data processing, output discharge capacity control signal driving main pump displacement control mechanism and main pump discharge capacity variable structure, the main pump discharge capacity is adjusted.
2, a kind of pressure sense and discharge capacity direct compensation constant-resistance moment energy-saving control system of diesel with, it is characterized in that comprising that being arranged on main pump exports the pressure transducer that is used to detect the main pump outlet pressure, pressure sense and discharge capacity direct compensation diesel engine constant-resistance moment electric energy-saving controller, described pressure transducer is connected with described controller; Also comprise and be used for pump displacement stroking mechanism and pump displacement control mechanism that pump delivery is adjusted, pump displacement stroking mechanism and pump displacement control mechanism are connected on main pump successively and discharge capacity is regulated between the pump, and the pump displacement control mechanism also is connected with the output terminal of pressure sense and discharge capacity direct compensation diesel engine constant-resistance moment electric energy-saving controller; Pressure sense and discharge capacity direct compensation diesel engine constant-resistance moment electric energy-saving controller carries out data processing, output discharge capacity control signal driven pump displacement control mechanism according to the main pump outlet pressure and the constant-resistance moment variations rule of input, and the main pump discharge capacity is adjusted.
3, pressure sense and discharge capacity direct compensation constant-resistance moment energy-saving control system of diesel with according to claim 2, it is characterized in that at pressure sense and discharge capacity direct compensation diesel engine constant-resistance moment electric energy-saving controller be a microprocessor, according to each operating mode power character or Economy requirement, wherein store some diesel engine constant-resistance moment working curves in advance, i.e. main pump outlet pressure and the main pump discharge capacity working curve of relationship change in inverse ratio.
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| CN2009101262547A CN101624941B (en) | 2008-11-15 | 2009-03-05 | Energy-saving control method of engineering machinery and constant-resistance moment energy-saving control system of diesel with pressure sense and discharge capacity direct compensation |
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| CN2009101262547A CN101624941B (en) | 2008-11-15 | 2009-03-05 | Energy-saving control method of engineering machinery and constant-resistance moment energy-saving control system of diesel with pressure sense and discharge capacity direct compensation |
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| CN101825026A (en) * | 2010-04-15 | 2010-09-08 | 中国第一汽车集团公司 | Load intelligent identifying fuel-saving control method for whole diesel vehicle |
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| CN100422451C (en) * | 2005-03-28 | 2008-10-01 | 广西柳工机械股份有限公司 | Mechanical digger full power control system and method |
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- 2009-03-05 CN CN2009101262547A patent/CN101624941B/en not_active Expired - Fee Related
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| CN101825026B (en) * | 2010-04-15 | 2012-10-10 | 中国第一汽车集团公司 | Load intelligent identifying fuel-saving control method for whole diesel vehicle |
| CN101825026A (en) * | 2010-04-15 | 2010-09-08 | 中国第一汽车集团公司 | Load intelligent identifying fuel-saving control method for whole diesel vehicle |
| CN102828942A (en) * | 2011-06-16 | 2012-12-19 | 中联重科股份有限公司 | Constant-power control device and method for variable displacement pump and concrete pumping installation |
| CN102828942B (en) * | 2011-06-16 | 2015-11-18 | 中联重科股份有限公司 | The constant power control device of variable displacement pump, method and the concrete pump set |
| CN102926429A (en) * | 2012-11-16 | 2013-02-13 | 无锡汇虹机械制造有限公司 | Energy-saving control method for divided working condition of single-bucket hydraulic excavator |
| CN102926429B (en) * | 2012-11-16 | 2015-08-12 | 江苏高博智融科技有限公司 | A kind of single bucket hydraulic excavator divided working status energy-saving control method |
| CN104033260B (en) * | 2014-06-06 | 2016-11-30 | 上海中联重科桩工机械有限公司 | Control method for engine speed, equipment, system and engineering machinery |
| CN104033260A (en) * | 2014-06-06 | 2014-09-10 | 上海中联重科桩工机械有限公司 | Engine rotating speed control method, engine rotating speed control equipment, engine rotating speed control system and engineering machinery |
| CN105221277B (en) * | 2014-07-01 | 2017-11-21 | 徐工集团工程机械股份有限公司 | Crane engine Poewr control method and system |
| CN105221277A (en) * | 2014-07-01 | 2016-01-06 | 徐工集团工程机械股份有限公司 | Crane engine Poewr control method and system |
| CN105347193A (en) * | 2015-11-23 | 2016-02-24 | 潍柴动力股份有限公司 | Constant-power and variable-power point control system and method for crane |
| CN105347193B (en) * | 2015-11-23 | 2017-06-27 | 潍柴动力股份有限公司 | Crane constant power Variable power point control system and method |
| CN106122369A (en) * | 2016-06-23 | 2016-11-16 | 上海中船三井造船柴油机有限公司 | A kind of electric device compensated for diesel engine second moment |
| CN106122369B (en) * | 2016-06-23 | 2018-05-08 | 上海中船三井造船柴油机有限公司 | A kind of electric device for the compensation of diesel engine second moment |
| CN112912604B (en) * | 2018-10-22 | 2023-09-05 | 纬湃科技有限责任公司 | Method and system for regulating the rotational speed of an internal combustion engine driving a detachable device |
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