CN103925089A - Engineering machinery, dynamic energy saving method and dynamic energy saving system - Google Patents
Engineering machinery, dynamic energy saving method and dynamic energy saving system Download PDFInfo
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Abstract
The invention discloses engineering machinery, a dynamic energy saving method and a dynamic energy saving system. The dynamic energy saving system is used for a power transmission system which is provided with an engine and a load-sensitive variable pump. The dynamic energy saving system comprises a first pressure sensor, a detection device and a controller. The first pressure sensor is arranged at an outlet end of the load-sensitive variable pump and used for measuring outlet pressure of the load-sensitive variable pump; the detection device is connected to a main valve which is connected with the load-sensitive variable pump, and the detection device is used for detecting control signals of the main valve; the controller is respectively connected with the first pressure sensor, the detection device and the engine and used for determining current flow of a main oil passage according to the control signals and dynamically calling a preset optimal rotating speed of the engine according to requirements of the outlet pressure and the current flow of the main oil passage. Oil consumption of the engine can be dynamically adjusted by the aid of the dynamic energy saving method and the dynamic energy saving system, and accordingly dynamic energy saving can be realized.
Description
Technical field
The present invention relates to engineering machinery field, particularly a kind of dynamic energy saving method and system, and the engineering machinery that adopts this dynamic energy saving method and system.
Background technique
At present, engineering machinery adopts electric-control motor and load-reacting system as the power transmission system of hoist more.Wherein, electric-control motor drives the load-reacting pump running in load-reacting system, and then the follow-up hydraulic system that is connected with variable displacement pump of drive.The feature of this power transmission system is: the one,, require the low speed torque of motor enough large, can when not stepping on the gas, meet the power demand that respectively lifts operating mode, rotating speed is more low better simultaneously.The 2nd,, load-sensitive hydraulic control variable system can be controlled pilot pressure by operating grip angular orientation, and then determine the aperture of main valve, i.e. the traffic demand of working connection, load-reacting pump can become the demand that discharge capacity meets flow under the constant prerequisite of rotating speed; Between variable displacement pump delivery pressure and induced pressure (being main valve delivery pressure), pressure reduction is definite value.
In above-mentioned power transmission system, load-reacting pump exists the difference of mechanical efficiency and volumetric efficiency very high under different pressures and different rotating speeds, sometimes can be up to 40%, and this can only adjust oil pump capacity according to traffic demand by operator.In addition, in above-mentioned power transmission system, the fuel consume of motor under different rotating speeds and different moment of torsion also differs greatly, and system energy consumption is high.Therefore, above-mentioned this power transmission system cannot meet economic benefit that engineering machinery is increased day by day and the requirement of operating efficiency.
Summary of the invention
In view of this, the present invention proposes a kind of dynamic energy saving method and system, can dynamically adjust engine consumption, thereby realize dynamic energy-saving.The present invention proposes a kind of engineering machinery that is provided with this dynamic energy saving method and system.
For achieving the above object, technological scheme of the present invention is achieved in that
On the one hand, the invention provides a kind of dynamic energy saving system, this dynamic energy saving system is for power transmission system, this power transmission system is provided with motor and load-reacting pump, this dynamic energy saving system comprises: the first pressure transducer, be connected in described load-reacting delivery side of pump end, for measuring described load-reacting delivery side of pump pressure; Detection device, is connected in the main valve being connected with described load-reacting pump, for measuring the control signal of described main valve; Controller, be connected respectively with described the first pressure transducer, described detection device and described motor, described controller is for determining current working connection flow according to the control signal of described main valve, and according to the demand of current working connection flow and described load-reacting pump discharge pressure, dynamic control engine rotating speed.
Alternatively, in said system, described detection device can comprise: pilot valve, dispose hydraulic control handle, and described pilot valve is connected with described main valve; The second pressure transducer, is arranged between the pilot valve and main valve of described load-reacting pump, and is connected with described controller, for measuring the pilot pressure of described pilot valve; Wherein, the control signal of described main valve is pilot pressure, is preset with the corresponding relation of described pilot pressure and main valve aperture in described controller, and for determining according to current main valve aperture the working connection flow that current operation is required.
Alternatively, in said system, described detection device can comprise: pilot valve, dispose electric control handle, and described pilot valve is connected with described main valve; Wherein, the current signal that described control signal is described electric control handle; Described electric control handle is connected with described controller; In described controller, be preset with the corresponding relation of described current signal and main valve aperture, and for determining according to current main valve aperture the working connection flow that current operation is required.
Further, in said system, described controller can comprise: input end, is connected the outlet pressure detecting for receiving described control signal and described the first pressure transducer with described detection device and described the first pressure transducer; Processing unit, is connected with described input end, for the treatment of described control signal and described outlet pressure, to obtain current required working connection flow and outlet pressure; Storage unit, for storing engine optimum rotating speed corresponding under working connection flow and outlet pressure various combination; Matching unit, is connected with described processing unit and described storage unit, for search the engine optimum rotating speed matching with described working connection flow and outlet pressure in described storage unit; Output terminal, is connected with described matching unit and described motor, for to described motor sending controling instruction, makes it with the engine optimum rotating speed being found, carry out work.
Further, in said system, described controller also comprises: flame-out control unit, be connected with described processing unit, and for the time span lower than preset pressure according to described outlet pressure, determine whether to send flame-out instruction to described motor.
With respect to prior art, the present invention has following advantage:
Dynamic energy saving system of the present invention is the demand to working connection flow and oil pump outlet pressure by judgement user, choice of dynamical engine optimum rotating speed, make motor realize dynamic energy-saving with its optimized rotating speed running, this can not only make motor for a long time with most economical (optimum) rotary speed working, to reduce oil consumption and discharge, can also, meeting user to the requirement of speed and moment simultaneously, not affecting under the prerequisite of user's operating experience, carry out Energy Saving Control.And, in dynamic energy saving system of the present invention, can be by the intelligent control of controller, thus cancel the operation of gas pedal, thus the workload of operator reduced.
On the other hand, the present invention also provides a kind of dynamic energy saving method of power transmission system, this power transmission system is provided with motor and load-reacting pump, this dynamic energy saving method comprises: the various combination of corresponding described load-reacting delivery side of pump pressure and working connection flow, using the minimum ratio of engine fuel consumption rate and oil pump efficiency as standard, set in advance and store engine optimum rotating speed; Detect and obtain current operation required working connection flow and outlet pressure, and choose accordingly corresponding engine optimum rotating speed; Selected engine optimum rotating speed is sent to described motor as control command, make described motor adopt selected engine optimum rotating speed to carry out work.
Further, in said method, described detection is also obtained the required working connection flow of current operation and is comprised: the corresponding relation of setting up in advance main valve aperture and main valve control signal in the working connection of power transmission system; Obtain current main valve control signal in power transmission system, by described current main valve control signal, obtain described current main valve aperture, according to described current main valve aperture, determine the working connection flow that current operation is required; Wherein, described main valve control signal is for controlling pilot pressure or the current signal of described pilot valve.
Further, in said method, described minimum ratio of usining engine fuel consumption rate and oil pump efficiency is as standard, setting in advance and store engine optimum rotating speed comprises: on platform experiment, set up universal characteristic curve and the oil pump efficiency characteristic curve of motor, determine engine fuel consumption rate and oil pump efficiency under different working connection flows and outlet pressure combination; Complete machine is demarcated the universal characteristic curve of motor, obtains the correction universal characteristic curve of motor, sets up the corresponding relation of itself and engine speed, outlet pressure and oil pump capacity according to revised engine fuel consumption rate and oil pump efficiency; The minimum ratio that described engine fuel consumption rate and described oil pump efficiency are set is screening conditions; Based on described screening conditions, various combination for working connection flow and outlet pressure, choose respectively the corresponding engine speed of described minimum ratio, set up and store described engine speed and corresponding working connection flow and the matching relationship between outlet pressure.
With respect to prior art, the present invention has following advantage:
Dynamic energy saving method of the present invention is the demand to working connection flow and oil pump outlet pressure by judgement user, choice of dynamical engine optimum rotating speed, make motor realize dynamic energy-saving with its optimized rotating speed running, this can not only make motor for a long time with most economical (optimum) rotary speed working, to reduce oil consumption and discharge, can also, meeting user to the requirement of speed and moment simultaneously, not affecting under the prerequisite of user's operating experience, carry out Energy Saving Control.And dynamic energy saving method of the present invention can be by the intelligent control of controller, thereby cancel the operation of gas pedal, thereby reduce the workload of operator.
Another aspect, the present invention proposes a kind of engineering machinery, and this project machinery is provided with the power transmission system that comprises motor and load-reacting pump, and described engineering machinery is also provided with above-mentioned dynamic energy saving system described in any.
Because above-mentioned any dynamic energy saving system has above-mentioned technique effect, therefore, the engineering machinery that is provided with this dynamic energy saving system also should possess corresponding technique effect, does not hereby repeat.
Accompanying drawing explanation
The accompanying drawing that forms a part of the present invention is used to provide a further understanding of the present invention, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is dynamic energy saving system embodiment's one provided by the invention composition schematic diagram;
Fig. 2 is dynamic power matching principle schematic diagram in dynamic energy saving system embodiment one provided by the invention;
Fig. 3 is dynamic energy saving system embodiment's two provided by the invention composition schematic diagram;
Fig. 4 is dynamic power matching principle schematic diagram in dynamic energy saving system embodiment two provided by the invention.
Description of reference numerals
10 controllers
20 second pressure transducers
30 first pressure transducers
40 motors
41 ECU
50 load-reacting pumps
51 main valves
52 pilot valves
53 hydraulic control handles
54 electric control handles
60 follow-up hydraulic systems
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technological scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiments.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment who obtains under creative work prerequisite, belong to the scope of protection of the invention.
It should be noted that, in the situation that not conflicting, embodiment and the feature in embodiment in the present invention can combine mutually.
Basic thought of the present invention is: in load-reacting system, the efficiency variance of variable capacity oil pump under different pressures and different rotating speeds and the difference of motor fuel consume under different rotating speeds and different moment of torsion, design a kind of power-economizing method and system of dynamic power matched, the minimum ratio of engine fuel consumption rate and oil pump efficiency of take is standard, choose the optimized rotating speed of motor, and then realize dynamic energy-saving.
Below in conjunction with accompanying drawing, each preferred embodiment of the present invention is described further:
system embodiment
The present embodiment proposes a kind of dynamic energy saving system, and this dynamic energy saving system is for power transmission system, and this power transmission system is provided with motor 40 and load-reacting pump 50.This dynamic energy saving system comprises: the first pressure transducer 30, detection device and controller 10.Wherein, the first pressure transducer 30, is connected in the outlet end of load-reacting pump 50, for the outlet pressure of the responsive variable displacement pump 50 of sensing lead.On the working connection of power transmission system, load-reacting pump 50 connects main valve 51, and detection device is connected in main valve 51, and detection device is for measuring the control signal of main valve 51.Controller 10 is connected respectively with the first pressure transducer 30, detection device and motor 40, controller 10 is for determining current working connection flow according to the control signal of main valve 51, and according to the demand of the outlet pressure of current working connection flow and load-reacting pump 50, dynamic control engine rotating speed, for example, by calling its default engine optimum rotating speed, carry out control engine rotating speed, make it always in optimum state.
In the present embodiment, controller 10 gets outlet pressure by the first pressure transducer 30, and then can determine the current outlet pressure of load-reacting pump 50.Controller 10 gets the control signal of main valve 51 by detection device, according to the control signal of main valve 51, determine main valve aperture, and then determines current working connection flow according to main valve aperture.Like this, controller 10 can be according to the demand of current working connection flow and outlet pressure, its default engine optimum rotating speed of dynamic call, this engine optimum rotating speed is to take the minimum ratio of engine fuel consumption rate and oil pump efficiency to choose as standard, can to the demand of speed and actual loading situation, realize dynamic energy-saving according to user.
It should be noted that, in the present embodiment, default engine optimum rotating speed refers to: for different working connection flow and outlet pressures, the minimum ratio of efficiency of engine fuel consumption rate and load-reacting pump of take is screening conditions, and the minimum and discharge minimum of engine operation oil consumption that correspondence is chosen is most economical rotating speed.
Therefore, the dynamic energy saving system of the present embodiment is the demand to working connection flow and oil pump outlet pressure by judgement load, choice of dynamical engine optimum rotating speed, make motor realize dynamic energy-saving with its optimized rotating speed running, this can not only make motor for a long time with most economical (optimum) rotary speed working, to reduce oil consumption and discharge, can also meet user to the requirement of speed and moment simultaneously, not affecting under the prerequisite of user's operating experience, carry out Energy Saving Control.And, in the dynamic energy saving system of the present embodiment, can be by the intelligent control of controller, thus cancel the operation of gas pedal, thus the workload of operator reduced.
embodiment one
See figures.1.and.2, it shows respectively dynamic energy saving system embodiment one structure and working principle.The present embodiment one be take hydraulic control and is responsible for responsive variable system as example, and therefore, in the dynamic energy saving system that above-described embodiment proposes, detection device can further comprise: pilot valve 52 and the second pressure transducer 20.As depicted in figs. 1 and 2, pilot valve 52 disposes hydraulic control handle 53, and pilot valve 52 is connected with main valve 51.The second pressure transducer 20 is arranged between the pilot valve 52 and main valve 51 of load-reacting pump 50, and is connected with controller 10, and the second pressure transducer 20 is for measuring the pilot pressure of pilot valve 52.Wherein, on the working connection of the power transmission system of the present embodiment, main valve 51 is connected with follow-up hydraulic system 60.
In the present embodiment, control signal is pilot pressure, is preset with the corresponding relation of pilot pressure and main valve aperture in controller 10, and controller 10 is for determining according to current main valve aperture the working connection flow that current operation is required.
It should be noted that, in above-mentioned dynamic energy saving system, the first pressure transducer is the sensor for measurand pump discharge pressure, and the second pressure transducer is for measuring the sensor of pilot pressure.The present embodiment is on the basis of traditional load-reacting system, the dynamic energy saving system proposing can be realized according to operator the action demand of speed and the pressure of load, Dynamic Matching goes out the economic speed that fuel consume is minimum, then give Engine ECU (Electronic Control Unit, electronic control unit) send control command, make engine operation under this rotating speed.
In an optional embodiment, above-mentioned controller 10 can be connected with motor 40 by ECU41.
In an optional embodiment, above-mentioned controller 10 can comprise following structure: input end, processing unit, storage unit, matching unit and output terminal.Wherein:
Input end is connected with the first pressure transducer 30 and the second pressure transducer 20, the pilot pressure signal detecting for receiving outlet pressure that the first pressure transducer 30 detects and the second pressure transducer 20.
Processing unit is connected with input end, for the treatment of pilot pressure signal and outlet pressure, to obtain current required working connection flow and outlet pressure.
Storage unit is for storing engine optimum rotating speed corresponding under working connection flow and outlet pressure various combination.
Matching unit is connected with processing unit and storage unit, for search the engine optimum rotating speed matching with working connection flow and outlet pressure in storage unit.
Output terminal is connected with the ECU41 of matching unit and motor 40, for to motor 40 sending controling instructions, makes it with the engine optimum rotating speed being found, carry out work.
Wherein, storage unit also can be used for storing the pilot pressure of pilot valve 52 and the corresponding relation of main valve aperture.Processing unit also can be used for the corresponding relation based on pilot pressure and main valve aperture, and determines according to current main valve aperture the working connection flow that current operation is required.
In a preferred embodiment, controller 10 also comprises: flame-out control unit, flame-out control unit is connected with processing unit, and the control unit that stops working is used for the outlet pressure that detects according to processing unit lower than the time span of preset pressure, determines whether to send flame-out instruction to motor 40.For example, when outlet pressure surpassed while setting duration lower than time of preset pressure, to motor 40, send flame-out instruction.
It should be noted that, the present embodiment can determine whether beginning timing according to the size of outlet pressure, if actual outlet pressure is less than preset pressure, starts timing.Outlet pressure when wherein, preset pressure can be attonity.When timing duration reaches while presetting duration, to motor, send flame-out instruction.
Below in conjunction with Fig. 2, the working principle of above-mentioned dynamic energy saving system is once described:
As shown in Figure 2, on stand, the relation of pilot pressure and main valve aperture is tested in detail, obtain the corresponding relation data between the two, in input database.Equally, on stand, the efficiency of load-reacting pump (volumetric efficiency and mechanical efficiency) and the relation of pressure, rotating speed are tested in detail, and by test result data input base.On complete machine, the mapping characteristics of motor is demarcated again, obtain revising mapping characteristics data, then input database.It is minimum as evaluation criterion to using the fuel consumption rate of Engine Universal Characteristics and the ratio of oil pump efficiency, obtains the matching list of the engine optimum rotating speed under different working connection flows and outlet pressure, as shown in table 1:
Table 1: the matching list of engine optimum rotating speed
Visible, the present embodiment, by platform experiment, is set up universal characteristic curve and the oil pump efficiency characteristic curve of motor, determines engine fuel consumption rate and oil pump efficiency under different working connection flows and outlet pressure combination.Then, complete machine is demarcated the universal characteristic curve of motor, obtains the correction universal characteristic curve of motor, sets up the corresponding relation of itself and engine speed, outlet pressure and oil pump capacity according to revised engine fuel consumption rate and oil pump efficiency.And, by using the minimum ratio of engine fuel consumption rate and oil pump efficiency as screening conditions, based on described screening conditions, various combination for working connection flow and outlet pressure, choose respectively the corresponding engine speed of minimum ratio and oil pump capacity, set up and store engine speed and oil pump capacity and corresponding working connection flow and the matching relationship between outlet pressure.
In dynamic control process, controller judges that by two pressure sensor signals users are to the demand of speed and actual loading situation, then it is minimum as evaluation criterion to using the fuel consumption rate of Engine Universal Characteristics and the ratio of oil pump efficiency, consider dangerous working condition and flame-out work simultaneously, obtain optimized rotating speed, finally optimized rotating speed instruction is sent to ECU, make motor with this optimized rotating speed work.
It is pointed out that if get on the bus not action in presetting duration (as 5 minutes), can auto extinguishing.The present embodiment can determine whether beginning timing according to pressure signal, and the time reaches while presetting duration sends flame-out instruction to motor.Wherein, the pressure (as preset pressure) in the time of can judging whether actual pressure is less than attonity by pressure signal, if actual pressure is less than preset pressure, starts timing, reaches and presets duration, just send flame-out instruction to motor.For example, the pressure signal of two sensors is less than the time span of preset pressure over presetting duration (as 5 minutes, 10 minutes etc.), can realize auto extinguishing.Here, the general default setting of setup times is 5 minutes, and user can need to adjust the time according to operating mode.
In addition, it should be noted that, the present embodiment has also been paid the utmost attention to engineer machinery operation as hung safety and the flame-out problem in the process of carrying, and has adopted anti-stall and dangerous working condition measure.For example, the dynamic control seamlessly transit is set, as adopts current, before this and will three kinds of state smoothing transient modes.Like this, can avoid the impact that produces when excessive to gradient another rotating speed from a rotating speed, it is flame-out that the moment of torsion of motor causes while approaching limiting value.Under dangerous working condition and flame-out operating mode, not take merely fuel economy the best as target, but considering that the fuel economy under both of these case is best.
Therefore, the dynamic energy saving system of the present embodiment is by pilot pressure and oil pump outlet pressure, and the demand of judgement pressure and flow, then realizes dynamic energy-saving with engine optimum rotating speed.By implementing the present embodiment, can not only make motor for a long time with most economical (optimum) rotary speed working, to reduce oil consumption and discharge, can also, meeting user to the requirement of speed and moment simultaneously, not affecting under the prerequisite of user's operating experience, carry out Energy Saving Control.In addition, in the dynamic energy saving system of the present embodiment, by the intelligent control of controller, can cancel the operation of gas pedal, thereby reduce the workload of operator.
embodiment two
Different from above-described embodiment one is, it is example that the present embodiment be take automatically controlled responsible responsive variable system, in automatically controlled responsible responsive variable system, with electric control handle, replace hydraulic control and be responsible for hydraulic control handle in responsive variable system, can directly from electric control handle signal, propose current signal like this, according to the corresponding relation judgement of current signal and main valve aperture, find out the traffic demand of working connection.
With reference to Fig. 3 and Fig. 4, it shows respectively the working principle of dynamic power coupling in the structure of the dynamic energy saving system that the present embodiment proposes and automatically controlled responsible responsive variable system.
Dynamic energy saving system in the present embodiment, for the power transmission system of engineering machinery, this power transmission system is provided with motor 40 and load-reacting pump 50, and this dynamic energy saving system comprises: the first pressure transducer 30, detection device and controller 10.As shown in Figure 3 and Figure 4, the electric control handle 54 that above-mentioned detection device can further comprise pilot valve 52 and set, electric control handle 54 is controlled pilot valve 52, and pilot valve 52 is connected with main valve 51.Wherein, electric control handle 54 is connected with controller 10, is preset with the current signal of electric control handle 54 and the corresponding relation of main valve aperture in controller 10.Controller 10 is connected with motor 40 by ECU41.
In an optional embodiment, above-mentioned controller 10 can be connected with motor 40 by ECU41.
It is pointed out that the controller 10 in the various embodiments described above can comprise following structure: input end, processing unit, storage unit, matching unit and output terminal.Wherein:
Input end is connected with the first pressure transducer 30, for receive that outlet pressure that the first pressure transducer 30 detects and electric control handle 54 provide for controlling the current signal of pilot valve 52.
Processing unit is connected with input end, for the treatment of current signal and outlet pressure, to obtain current required working connection flow and outlet pressure.
Storage unit is for storing engine optimum rotating speed corresponding under working connection flow and outlet pressure various combination.
Matching unit is connected with processing unit and storage unit, for search the engine optimum rotating speed matching with working connection flow and outlet pressure in storage unit.
Output terminal is connected with the ECU41 of matching unit and motor 40, for to motor 40 sending controling instructions, makes it with the engine optimum rotating speed being found, carry out work.
In the present embodiment, storage unit also can be used for storing the current signal of pilot valve 52 and the corresponding relation of main valve aperture.Processing unit also can be used for the corresponding relation based on current signal and main valve aperture, according to current main valve aperture, determines the working connection flow that current operation is required.
Below in conjunction with Fig. 4, the working principle of above-mentioned dynamic energy saving system is once described:
As shown in Figure 4, on stand, the relation of the current signal of pilot valve and main valve aperture is tested in detail, obtain the corresponding relation data between the two, in input database.Equally, on stand, the efficiency of load-reacting pump (volumetric efficiency and mechanical efficiency) and the relation of pressure, rotating speed are tested in detail, and by test result data input base.On complete machine, the mapping characteristics of motor is demarcated again, obtain revising mapping characteristics data, then input database.It is minimum as evaluation criterion to using the fuel consumption rate of Engine Universal Characteristics and the ratio of oil pump efficiency, obtains the matching list (referring to above-mentioned table 1) of the engine optimum rotating speed under different working connection flows and outlet pressure.
In dynamic control process, controller is by the current signal of outlet pressure and pilot valve, user is to the demand of speed and actual loading situation in judgement, then it is minimum as evaluation criterion to using the fuel consumption rate of Engine Universal Characteristics and the ratio of oil pump efficiency, consider dangerous working condition and flame-out work simultaneously, obtain optimized rotating speed, finally optimized rotating speed instruction is sent to ECU, make motor with this optimized rotating speed work.
Therefore, the dynamic energy saving system of the present embodiment, by controlling current signal and the oil pump outlet pressure of pilot valve, is judged the demand of mouth pressure and working connection flow, and then choice of dynamical engine optimum rotating speed, realizes dynamic energy-saving with engine optimum rotating speed.By implementing the present embodiment, can not only make motor for a long time with most economical (optimum) rotary speed working, to reduce oil consumption and discharge, can also, meeting user to the requirement of speed and moment simultaneously, not affecting under the prerequisite of user's operating experience, carry out Energy Saving Control.In addition, in the dynamic energy saving system of the present embodiment, by the intelligent control of controller, can cancel the operation of gas pedal, thereby reduce the workload of operator.
It is emphasized that, the optimized rotating speed of motor refers to: consider on the basis of engine fuel consumption rate and oil pump efficiency, take the two ratio minimum be evaluation criterion, means by experiment, find out motor optimum operating speed, and be stored in database, then according to current working, by the mode of tabling look-up, obtain the current optimized rotating speed of motor.
embodiment of the method
Embodiment is corresponding with said system, and the present embodiment proposes a kind of dynamic energy saving method of power transmission system, and this power transmission system is provided with motor and load-reacting pump, and this dynamic energy saving method comprises:
S100: the various combination of corresponding load-reacting delivery side of pump pressure and working connection flow, using the minimum ratio of engine fuel consumption rate and oil pump efficiency as standard, set in advance and store engine optimum rotating speed;
S200: detect and obtain current operation required working connection flow and outlet pressure, and choose accordingly corresponding engine optimum rotating speed;
S300: selected engine optimum rotating speed is sent to motor as control command, make motor adopt selected engine optimum rotating speed to carry out work.
In a preferred embodiment, in above-mentioned S100, using the minimum ratio of engine fuel consumption rate and oil pump efficiency as standard, set in advance and store engine optimum rotating speed and comprise:
S101: on platform experiment, set up universal characteristic curve and the oil pump efficiency characteristic curve of motor, determine engine fuel consumption rate and oil pump efficiency under different working connection flows and outlet pressure combination;
S102: complete machine is demarcated the universal characteristic curve of motor, obtains the correction universal characteristic curve of motor, sets up the corresponding relation of itself and engine speed, outlet pressure and oil pump capacity according to revised engine fuel consumption rate and oil pump efficiency;
S103: the minimum ratio that described engine fuel consumption rate and described oil pump efficiency are set is screening conditions; Based on described screening conditions, various combination for working connection flow and outlet pressure, choose respectively the corresponding engine speed of described minimum ratio, set up and store described engine speed and corresponding working connection flow and the matching relationship between outlet pressure.
In a preferred embodiment, in above-mentioned S200, detect and obtain the required working connection flow of current operation and comprise:
S201: the corresponding relation of setting up in advance main valve aperture and main valve control signal in the working connection of power transmission system;
S202: obtain current main valve control signal in power transmission system, obtain current main valve aperture by current main valve control signal, determine according to current main valve aperture the working connection flow that current operation is required.
It is pointed out that in above-mentioned each embodiment of the method, main valve control signal is for controlling pilot pressure or the current signal of pilot valve.
In an optional embodiment, during pilot pressure signal that main valve control signal is the pilot valve controlled by hydraulic control handle, the hydraulic control handle position of setting up power transmission system is the corresponding relation of pilot pressure signal and main valve aperture and the corresponding relation of main valve aperture and working connection flow, and then can determine working connection flow according to current pilot pressure signal.
In another optional embodiment, during current signal that main valve control signal is the pilot valve controlled by electric control handle, obtain the current signal corresponding to electric control handle position of power transmission system, set up the corresponding relation of current signal and main valve aperture and the corresponding relation of main valve aperture and working connection flow, and then can determine working connection flow according to current current signal.
Here, with an example, above-mentioned dynamic energy saving method embodiment is described further:
1,, on stand, to for controlling the pilot pressure/current signal of pilot valve and the relation of main valve aperture is tested in detail, obtain the corresponding relation data between the two, in input database.Equally, on stand, the efficiency of responsive to load variable displacement pump (volumetric efficiency and mechanical efficiency) is tested in detail with the relation of pressure, rotating speed, and data input base.
2, on complete machine, the mapping characteristics of motor is demarcated again, obtain revising mapping characteristics data, then input database.
3, in dynamic control process, controller judges that by outlet pressure and pilot pressure signal (or current signal of pilot valve) user is to the demand of speed and actual loading situation, then it is minimum as evaluation criterion to using the fuel consumption rate of Engine Universal Characteristics and the ratio of oil pump efficiency, consider dangerous working condition and flame-out work simultaneously, obtain optimized rotating speed, finally optimized rotating speed instruction is sent to ECU, make motor with this optimized rotating speed work.
Therefore, the dynamic energy saving method of the present embodiment is the demand to working connection flow and oil pump outlet pressure by judgement user, choice of dynamical engine optimum rotating speed, make motor realize dynamic energy-saving with its optimized rotating speed running, this can not only make motor for a long time with most economical (optimum) rotary speed working, to reduce oil consumption and discharge, can also meet user to the requirement of speed and moment simultaneously, not affecting under the prerequisite of user's operating experience, carry out Energy Saving Control.And, in the dynamic energy saving method of the present embodiment, can be by the intelligent control of controller, thus cancel the operation of gas pedal, thus the workload of operator reduced.
Other embodiments of the invention also provide a kind of engineering machinery, hoist for example, and this project machinery is provided with above-mentioned any dynamic energy saving system, and engineering machinery is also provided with power transmission system.Because above-mentioned any dynamic energy saving system has above-mentioned technique effect, therefore, the engineering machinery that is provided with this dynamic energy saving system also should possess corresponding technique effect, and its specific implementation process is similar to the above embodiments, does not hereby repeat.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general computing device, they can concentrate on single computing device, or be distributed on the network that a plurality of computing devices form, alternatively, they can be realized with the executable program-code of computing device, thereby, they can be stored in storage device and be carried out by computing device, or they are made into respectively to each integrated circuit module, or a plurality of modules in them or step are made into single integrated circuit module to be realized.Like this, the present invention is not restricted to any specific hardware and software combination.Described storage device is nonvolatile memory, as: ROM/RAM, flash memory, magnetic disc, CD etc.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a dynamic energy saving system, for power transmission system, this power transmission system is provided with motor (40) and load-reacting pump (50), it is characterized in that, and this dynamic energy saving system comprises:
The first pressure transducer (30), is connected in the outlet end of described load-reacting pump (50), for measuring the outlet pressure of described load-reacting pump (50);
Detection device, is connected in the main valve (51) being connected with described load-reacting pump (50), for measuring the control signal of described main valve (51);
Controller (10), be connected respectively with described the first pressure transducer (30), described detection device and described motor (40), described controller (10) is for determining current working connection flow according to the control signal of described main valve (51), and according to the demand of the outlet pressure of current working connection flow and described load-reacting pump (50), dynamic control engine rotating speed.
2. dynamic energy saving system according to claim 1, is characterized in that, described detection device comprises:
Pilot valve (52), disposes hydraulic control handle (53), and described pilot valve (52) is connected with described main valve (51);
The second pressure transducer (20), is arranged between described pilot valve (52) and main valve (51), and is connected with described controller (10), for measuring the pilot pressure of described pilot valve (52).
3. dynamic energy saving system according to claim 2, it is characterized in that, the control signal of described main valve (51) is pilot pressure, in described controller (10), be preset with the corresponding relation of described pilot pressure and main valve aperture, and for determining according to current main valve aperture the working connection flow that current operation is required.
4. dynamic energy saving system according to claim 1, is characterized in that, described detection device comprises:
Pilot valve (52), disposes electric control handle (54), and described pilot valve (52) is connected with described main valve (51);
Wherein, the control signal of described main valve (51) is the current signal of described electric control handle (54); Described electric control handle (54) is connected with described controller (10); In described controller (10), be preset with the corresponding relation of described current signal and main valve aperture, and for determining according to current main valve aperture the working connection flow that current operation is required.
5. according to the dynamic energy saving system described in claim 2 to 4 any one, it is characterized in that, described controller (10) comprising:
Input end, is connected with described detection device and described the first pressure transducer (30), the outlet pressure detecting for receiving described control signal and described the first pressure transducer (30);
Processing unit, is connected with described input end, for the treatment of described control signal and described outlet pressure, to obtain current required working connection flow and outlet pressure;
Storage unit, for storing engine optimum rotating speed corresponding under working connection flow and outlet pressure various combination;
Matching unit, is connected with described processing unit and described storage unit, for search the engine optimum rotating speed matching with described working connection flow and outlet pressure in described storage unit;
Output terminal, is connected with described matching unit and described motor (40), for to described motor (40) sending controling instruction, makes it with the engine optimum rotating speed being found, carry out work.
6. dynamic energy saving system according to claim 5, is characterized in that, described controller (10) also comprises:
Flame-out control unit, is connected with described processing unit, for during over setting duration, sending flame-out instruction to described motor (40) lower than time of preset pressure when described outlet pressure.
7. a dynamic energy saving method, for power transmission system, this power transmission system is provided with motor and load-reacting pump, it is characterized in that, and this dynamic energy saving method comprises:
The various combination of corresponding described load-reacting delivery side of pump pressure and working connection flow, usings the minimum ratio of engine fuel consumption rate and oil pump efficiency as standard, sets in advance and store engine optimum rotating speed;
Detect and obtain current operation required working connection flow and outlet pressure, and choose accordingly corresponding engine optimum rotating speed;
Selected engine optimum rotating speed is sent to described motor as control command, make described motor adopt selected engine optimum rotating speed to carry out work.
8. dynamic energy saving method according to claim 7, is characterized in that, described detection is also obtained the required working connection flow of current operation and comprised:
Set up in advance the corresponding relation of main valve aperture and main valve control signal in the working connection of power transmission system;
Obtain current main valve control signal in power transmission system, by described current main valve control signal, obtain described current main valve aperture, according to described current main valve aperture, determine the working connection flow that current operation is required;
Wherein, described main valve control signal is for controlling pilot pressure or the current signal of described pilot valve.
9. dynamic energy saving method according to claim 8, is characterized in that, described minimum ratio of usining engine fuel consumption rate and oil pump efficiency, as standard, sets in advance and stores engine optimum rotating speed and comprise:
By experiment, set up universal characteristic curve and the oil pump efficiency characteristic curve of motor, determine engine fuel consumption rate and oil pump efficiency under different working connection flows and outlet pressure combination;
Complete machine is demarcated the universal characteristic curve of motor, obtains the correction universal characteristic curve of motor, sets up the corresponding relation of itself and engine speed, outlet pressure and oil pump capacity according to revised engine fuel consumption rate and oil pump efficiency;
The minimum ratio that described engine fuel consumption rate and described oil pump efficiency are set is screening conditions; Based on described screening conditions, various combination for working connection flow and outlet pressure, choose respectively the corresponding engine speed of described minimum ratio, set up and store described engine speed and corresponding working connection flow and the matching relationship between outlet pressure.
10. an engineering machinery, is provided with the power transmission system that comprises motor and load-reacting pump, it is characterized in that, this project machinery is also provided with the dynamic energy saving system described in claim 1 to 6 any one.
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