CN108204285B - Multi-curve power matching energy-saving control system and method for hydraulic engineering machinery - Google Patents
Multi-curve power matching energy-saving control system and method for hydraulic engineering machinery Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
- F02D29/04—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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Abstract
The invention discloses a multi-curve power matching energy-saving control method for hydraulic engineering machinery, which comprises the following steps: s1, setting the matching relation between the engine load working condition and the engine working gear and the external characteristic power torque curve and the speed regulation rate, S2, writing the working mode, the matching relation between the gear and the external characteristic power torque curve and the speed regulation rate, the corresponding parameters and the working parameters of the main pump which are set in the step S1 into an external controller; and S3, acquiring a control signal by the external controller, S4, performing calculation processing by the external controller, and S5, controlling the engine controller and the electric proportional control valve by the external controller. The invention designs a plurality of groups of external characteristic power torque curves and speed regulation values to be matched with different load working conditions, realizes the output of multi-curve power torque of the electric control diesel engine and the timely matching of the absorbed power of the hydraulic main pump, improves the energy utilization rate and reduces the unit fuel consumption rate of the whole hydraulic engineering machinery.
Description
Technical Field
The invention relates to the technical field of hydraulic engineering machinery, in particular to a multi-curve power matching energy-saving control system and method for hydraulic engineering machinery.
Background
At present, main manufacturers of hydraulic engineering machinery adopt a default external characteristic curve chart of a diesel engine, adopt the performance of the default external characteristic power curve and a fixed speed regulation rate, and carry out power matching by the maximum absorption power of a hydraulic main pump so as to meet the maximum operation capacity of the whole hydraulic engineering machinery equipment. However, in the actual construction process, the hydraulic engineering mechanical equipment often has various working conditions such as heavy load, economy, light load and the like, and for the working conditions of economy and light load, because the power required to be absorbed by the hydraulic system can be reduced, the output power of the engine is greater than the absorbed power required by the hydraulic pump at the moment, and energy waste can be caused.
The patent document No. 201310547845.8 discloses a multi-operating-point diesel engine and a control method thereof, wherein signals of power output of the diesel engine and power demand change of a load are monitored in real time by a power detection unit and transmitted to an ECU for processing, and the ECU determines the working number of fuel supply units and the working efficiency of each working fuel supply unit according to the load demand and transmits the signals to the plurality of fuel supply units so as to interrupt or recover the working of the plurality of fuel supply units. The diesel engine is different from the diesel engine in that the amount of diesel injected into a combustion chamber in the engine is adjusted according to a signal of a power detection unit.
Disclosure of Invention
The invention mainly aims to provide a multi-curve power matching energy-saving control system and method for hydraulic engineering machinery, and aims to solve the problem that consumption is caused by the fact that a group of characteristic power torque curves are adopted by an existing engine.
In order to achieve the above object, the present invention provides a multi-curve power matching energy-saving control system for hydraulic engineering machinery, comprising:
the external controller is provided with a plurality of external characteristic power torque curves and a plurality of groups of speed regulation rates;
the engine controller is connected with the external controller and the engine, and is used for acquiring the load working condition of the main pump and feeding back the load working condition to the external controller;
the monitor display is used for carrying out accelerator calibration, working mode setting and selection, external characteristic power torque curve setting and selection of the engine and speed regulation setting and selection;
and the electric proportional control valve is used for controlling the current through the adjustment period according to the external characteristic power torque curve and the adjustment rate selected by the external controller so as to control the displacement of the main pump.
The invention also provides a multi-curve power matching energy-saving control method for the hydraulic engineering machinery, which is characterized by comprising the following steps of:
s1, setting the matching relation between the engine load condition and the engine working gear and the external characteristic power torque curve and the speed regulation, including:
s11, setting four working modes of heavy load H, economy S, light load L and emergency B according to the load of the engine;
s12, five external characteristic power torque curves are set according to the inherent maximum external characteristic power torque curve A0 curve of the engine: the power and the torque of the engine corresponding to a certain rotating speed by the A1 curve, the A2 curve, the A3 curve, the A4 curve and the A5 curve are respectively 100%, 95%, 90%, 85% and 80% of the power and the torque corresponding to the same rotating speed in the A0 curve;
s13, setting five groups of speed regulation rates according to the speed regulation rate B0 set by the engine as a default which is 5 percent: b1, B2, B3, B4, B5, B1 being 8%, B2 being 10%, B3 being 15%, B4 being 18%, B5 being 20%;
s14, setting each engine working gear under each working mode, and the matching relation between the corresponding external characteristic power torque curve and the speed regulation rate is as follows:
in the heavy-load H mode, 9-10 gears correspond to an A1 curve and a B5 speed regulation rate, 5-8 gears correspond to an A2 curve and a B4 speed regulation rate, and 1-5 gears correspond to an A3 curve and a B3 speed regulation rate;
in the economic S mode, 8-9 gears correspond to an A2 curve and a B5 speed regulation rate, 5-7 gears correspond to an A3 curve and a B4 speed regulation rate, and 1-5 gears correspond to an A3 curve and a B3 speed regulation rate;
in the light load L mode, 7-8 gears correspond to an A5 curve and a B3 speed regulation rate, 4-6 gears correspond to an A4 curve and a B2 speed regulation rate, and 1-4 gears correspond to an A5 curve and a B0 speed regulation rate;
in the emergency mode, 1-10 gears correspond to an A5 curve and a B1 speed regulation rate;
s2, writing the working mode, the matching relation of the gear and the external characteristic power torque curve, the speed regulation rate, the corresponding parameters and the working parameters of the main pump set in the step S1 into an external controller, wherein the working parameters of the main pump comprise the one-to-one corresponding relation of output pressure P, displacement q and control current i of an electric proportional control valve for controlling the displacement q;
s3, the external controller obtains a control signal, including:
s31, connecting the external controller with an engine controller, and acquiring control input signals of a load connected with the engine through the engine controller, wherein the control input signals comprise the current rotating speed n of the engine and the current output pressure P of a main pumpb；
S32, a monitor instrument display is arranged and connected with the input end of the external controller, and the monitor instrument display is used for selecting the working mode, the external characteristic power torque curve and the speed regulation rate;
and S4, the external controller performs calculation:
the external controller calculates power and torque which are correspondingly matched with the load and speed regulation rate according to the written parameter data in the step S2 and the control input signal data acquired in the step S3, and outputs a power torque instruction and a speed regulation rate setting instruction to the engine controller;
s5, the external controller controls the engine controller and the electric proportional control valve, including:
s51, the engine controller outputs corresponding power torque and rotating speed according to the received power torque instruction, and the engine controller is connected with the main pump through the coupler to transmit power to the main pump;
s52, the engine controller adjusts the speed adjusting rate of the engine through the speed adjuster according to the received speed adjusting rate setting instruction, so that the engine can timely ensure that the engine outputs a corresponding power torque curve and a relatively stable rotating speed in the set speed adjusting rate;
and S53, the external controller is connected with the main pump through an electric proportional control valve, outputs a corresponding instruction to adjust the control current i of the electric proportional control valve, and changes the discharge capacity q of the main pump through the control current i to realize output power control.
Further, the accelerator parameter calibration can be carried out through the monitor instrument display.
Further, the working parameters of the main pump also comprise fuel consumption and throttle opening value.
Further, in step S51, the engine controller communicates with the engine controller according to the received power torque command, selects an accelerator opening parameter, and calculates a fuel injection time required by the engine, so as to control an injection amount of the engine, thereby adjusting the engine to operate at a required rotation speed.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
the invention is characterized in that an external controller is connected with an engine controller, a plurality of groups of external characteristic power torque curves and a plurality of groups of speed regulation values are stored and input in the external controller, the input end of the external controller is connected with a monitor display, and a user can select different external characteristic power torque curves through the monitor display, so that the external characteristic power torque curves are matched with different load working conditions, and different speed regulation values can be selected to ensure the stability of output power torque and rotating speed. The invention realizes that the electric control diesel engine outputs multi-curve power torque which is matched with the absorption power of the hydraulic main pump in time, improves the energy utilization rate and reduces the unit fuel consumption rate of the whole hydraulic engineering machinery.
The invention also sets an electric proportional control valve to connect the external controller and the main pump, the electric proportional control valve changes the control current flow through the external controller, thereby changing the output hydraulic pressure, making the pump discharge capacity change, outputting power and torque according to different characteristic power torque curves, thus according to the power matching scheme of the prior optimization design, respectively controlling the current of the engine controller and the electric proportional control valve through the external controller, realizing energy-saving optimization, being equivalent to an engine with different powers simultaneously installed on one device, and also adopting two independent accelerator control systems: one set is used for normal power matching energy-saving control, the other set is used for emergency, after the whole electric control system is authorized by the instrument to enter a standby mode, the electric proportional control valve obtains a stable current through a matching resistor, the rotating speed of the engine is controlled through the emergency accelerator control system, at the moment, the engine controller is dismantled, engineering machinery such as an excavator can still carry out common working operation, emergency treatment measures are provided for maintenance, and the contradiction between the requirements of manufacturers and customers is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a block diagram of a control system adopted by a multi-curve power matching energy-saving control method for hydraulic engineering machinery according to an embodiment of the present invention.
The invention is illustrated by the reference numerals:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 1 | |
4 | |
| 2 | |
5 | |
| 3 | |
6 | Electric proportional control valve |
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a multi-curve power control method for hydraulic engineering machinery.
Referring to fig. 1, the present invention firstly provides a multi-curve power energy-saving control system for hydraulic engineering machinery, which includes a monitor display 1, an external controller 2, an Engine Controller (ECU)3, an engine 4, a main pump 5 and an electric proportional control valve 6.
The engine 4 is an electric control diesel engine, the engine controller 3 is an electronic controller of the engine 4, only one external characteristic power torque curve and a fixed speed regulation rate are arranged in the electronic controller of the current engineering machinery, the rotating speed and the output power of the engine are regulated through a bus, and therefore energy waste can be caused when the absorption power required by the actual working of the hydraulic main pump is smaller than the output power of the engine, therefore, an external controller 2 is arranged to be connected with the engine controller 3, a plurality of groups of external characteristic power torque curves and a plurality of groups of speed regulation rates are stored and input in the external controller 2, the input end of the external controller 2 is connected with a monitor display 1, a user can select different external characteristic power torque curves through the monitor display 1, and the external characteristic power torque curves are matched with different load working conditions, different speed regulation values can be selected to ensure that the output power torque and the rotating speed are stable.
The hydraulic pump of the hydraulic engineering machinery is driven by the engine, the displacement of the hydraulic pump is controlled by the rotating speed of the engine, the performance of a hydraulic system of the conventional constant power variable pump is not complete, the displacement of the main pump is adjusted along an inherent characteristic curve during working, the main pump always runs in the maximum power, the flow and the pressure, and energy waste exists.
Based on the multi-curve power energy-saving control system of the hydraulic engineering machinery, the invention provides a multi-curve power energy-saving control method of the hydraulic engineering machinery, which comprises the following steps:
s1, setting the matching relation between the engine load condition and the engine working gear and the external characteristic power torque curve and the speed regulation, including:
s11, setting four working modes of heavy load H, economy S, light load L and emergency B according to the load of the engine so as to adapt to different working conditions of hydraulic engineering machinery, and enabling a user to select according to the working condition requirements;
s12, because the engine power required is different in different engine speeds in each working mode, a multi-curve external characteristic power torque selection function is designed.
Specifically, five external characteristic power torque curves are designed in sequence on the basis of the maximum external characteristic power torque curve A0 inherent in the diesel engine:
curve A1 (A0X 100%), curve A2 (A0X 95%), curve A3 (A0X 90%), curve A4 (A0X 85%), curve A5 (A0X 80%),
the power and the torque of the engine corresponding to a certain rotating speed of the A1 curve, the A2 curve, the A3 curve, the A4 curve and the A5 curve are respectively 100%, 95%, 90%, 85% and 80% of the power and the torque corresponding to the same rotating speed in the A0 curve; and storing and writing the external characteristic power torque curve parameters into the external controller.
S13, because the fluctuation of the engine speed influences the power output of the hydraulic main pump (the output power of the pump is pump outlet pressure and outlet flow is pump outlet pressure and pump displacement and the rotation speed of the pump), the reasonable setting of the speed regulation rate can influence the working efficiency of the hydraulic excavator and the fuel economy of the engine, the default setting of the mechanical speed regulation rate of the general diesel engine is 8%, because the current III standard diesel engines basically adopt a high-pressure common-rail electric control injection control system, the corresponding speed is very fast, the operation is more flexible, the output power torque and the rotation speed are more stable, and the normal operation can be stabilized at the standard setting value of plus or minus 50 revolutions per minute.
However, different governing rates may vary in fuel efficiency of the engine, and therefore, in order to improve fuel efficiency, the present invention develops a plurality of sets of different governing rate values.
Specifically, according to the setting B0 of the engine default setting being 5%, five sets of setting rates are set: b1, B2, B3, B4 and B5, wherein B1 is 8%, B2 is 10%, B3 is 15%, B4 is 18% and B5 is 20%, and storing and writing the plurality of different sets of speed regulation values into the external controller.
S14, since Pi is P × Q/(60 η),
pi is the absorption power of the hydraulic main pump, namely the input power of the hydraulic main pump, and the unit is kW;
p is the output pressure of the hydraulic main pump, and the unit is MPa;
q is the total output flow of the hydraulic main pump, and the unit is L/min;
eta is the total mechanical and hydraulic efficiency of the hydraulic main pump, eta is eta 1 multiplied by eta 2, eta 1 is the mechanical efficiency, and eta 2 is the hydraulic efficiency;
the hydraulic main pump is a constant-power control system, and the total output flow Q is automatically regulated through the output pressure P determined by the load working condition, so that the output pressure P of the main pump changes if the load working condition changes in the working process of the hydraulic engineering machine, and the flow and the absorbed power of the main pump also change. Thereby setting the corresponding relation between the working mode and the external characteristic power torque curve; then, because the rotating speed of the electric control engine is mainly controlled by controlling the fuel injection quantity according to the speed regulation rate, if the speed regulation rate is high, the unit fuel injection quantity is low, if the speed regulation rate is low, the unit fuel injection quantity is high, according to a fuel consumption MAP distribution diagram provided by an engine manufacturer, when the output power torque of the engine meets the absorption power of a hydraulic main pump, the high speed regulation rate is used as far as possible, the engine works in a MAP distribution interval with low unit fuel consumption rate, and the fuel consumption rate is reduced, therefore, the working gear of each engine under each working mode is set, and the matching relation of the corresponding external characteristic power torque curve and the speed regulation rate is as follows:
s2, writing the matching relation into the external controller:
writing the matching relationship between the engine load pressure value and the gear number set in the step S1 and each external characteristic power torque curve parameter and speed regulation value of the engine and the working parameters of the main pump into the external controller,
the working parameters matched with the power of the main pump comprise output pressure P, discharge capacity q, fuel consumption g and an accelerator opening value; (output flow rate of main pump Q ═ qxn, unit is L/min, n is engine speed, unit is rpm)
S3: the external controller obtains the control signal, including:
s31, connecting the external controller with an engine controller, and acquiring the current rotating speed n of the engine and the current output pressure P of the main pump in real time through the engine controller;
s32, connecting the monitor display to the input end of the external controller, wherein the monitor display is display/input equipment, and the monitor display can be used for carrying out accelerator calibration, working mode selection, engine working gear selection, external characteristic power torque curve selection and setting and working mode selection;
and S4, the external controller performs calculation:
the external controller finds out the power and the torque which are correspondingly matched with the load according to the written matching parameter data in the step S2 and the control input signal data acquired in the step S3 and the current rotating speed n in the step S31, sets a corresponding speed regulation rate according to the selected working mode and the working gear of the engine, and outputs a power torque instruction and a speed regulation rate setting instruction to the engine controller;
meanwhile, the external controller calculates a control current i of the electric proportional control valve 6 for controlling the displacement q of the main pump, and outputs a corresponding instruction to adjust the electric proportional control valve to control the current i to work, so that the main pump is controlled to adjust the displacement of the main pump;
s5, the external controller controls the engine controller and the electric proportional control valve, including:
s51, the engine controller outputs corresponding power torque and rotating speed according to the received power torque instruction, and the engine controller is connected with the main pump through a coupler to transmit power to the main pump;
s52, the engine controller adjusts the speed adjusting rate of the engine through the speed adjuster according to the received speed adjusting rate setting instruction, so that the engine can timely ensure that the engine outputs a corresponding power torque curve and a relatively stable rotating speed in the set speed adjusting rate;
and S53, controlling the main pump 5 to regulate the discharge capacity of the main pump 5 by the electric proportional control valve 6 according to the control current i, and realizing the output power control of the main pump 5.
When the three work modes of H \ S \ L do not work, the emergency mode B can be independently started, an emergency control unit is started, a matched fixed resistor is used for generating a stable control current, and the output power of the hydraulic main pump is controlled.
The following is the test condition of the multi-curve power matching energy-saving control technology on a Jiuwu company JV150C hydraulic excavator product in Hengtian, and the unit oil consumption of the same equipment is reduced by about 10.77 percent.
JV150C Pre-efficiency Fuel consumption improvement data
JV150C fuel efficiency test, machine number: JV150CS000163, date: 2017.9.7, ambient temperature: 35.8 deg.C
JV150C data comparison after efficiency and fuel consumption optimization improvement
JV150C fuel efficiency test, machine number: JV150CS000163, date: 2017.9.8, ambient temperature: 35.8 deg.C
The data comparison after optimization and improvement shows that the multi-curve power energy-saving control system and the control method thereof for the hydraulic engineering machinery are applied to the excavator for operation, the single bucket oil consumption ratio is obviously improved, and the energy loss is reduced.
The invention optimizes and adjusts the absorbed power of the hydraulic system and an engine to output different power, torque and power parameters of fuel consumption rate according to the matching setting to realize energy saving; other current technologies (different hydraulic powers are matched with a fixed power output parameter of an engine) are to optimally adjust the absorbed power of a hydraulic system to be matched with the fixed power output parameter of the engine.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (5)
1. The utility model provides a hydraulic engineering machinery polycurve power matching energy-saving control system which characterized in that includes:
the external controller is provided with a plurality of external characteristic power torque curves and a plurality of groups of speed regulation rates;
the engine controller is connected with the external controller and the engine, and is used for acquiring the load working condition of the main pump and feeding back the load working condition to the external controller;
the monitor display is used for carrying out accelerator calibration, working mode setting and selection, external characteristic power torque curve setting and selection of the engine and speed regulation setting and selection;
the electric proportional control valve is used for controlling the discharge capacity of the main pump by adjusting the control current of the electric proportional control valve according to an external characteristic power torque curve and a speed regulation rate selected by an external controller;
the control method of the multi-curve power matching energy-saving control system of the hydraulic engineering machinery comprises the following steps:
s1, setting the matching relation between the engine load condition and the engine working gear and the external characteristic power torque curve and the speed regulation, including:
s11, setting four working modes of heavy load H, economy S, light load L and emergency B according to the load of the engine;
s12, five external characteristic power torque curves are set according to the inherent maximum external characteristic power torque curve A0 curve of the engine: the power and the torque of the engine corresponding to a certain rotating speed by the A1 curve, the A2 curve, the A3 curve, the A4 curve and the A5 curve are respectively 100%, 95%, 90%, 85% and 80% of the power and the torque corresponding to the same rotating speed in the A0 curve;
and S13, setting five groups of regulation rates according to the regulation rate B0=5% of the default setting of the engine: b1, B2, B3, B4, B5, B1=8%, B2=10%, B3=15%, B4=18%, B5= 20%;
s14, setting each engine working gear under each working mode, and the matching relation between the corresponding external characteristic power torque curve and the speed regulation rate is as follows:
in the heavy-load H mode, 9-10 gears correspond to an A1 curve and a B5 speed regulation rate, 5-8 gears correspond to an A2 curve and a B4 speed regulation rate, and 1-5 gears correspond to an A3 curve and a B3 speed regulation rate;
in the economic S mode, 8-9 gears correspond to an A2 curve and a B5 speed regulation rate, 5-7 gears correspond to an A3 curve and a B4 speed regulation rate, and 1-5 gears correspond to an A3 curve and a B3 speed regulation rate;
in the light load L mode, 7-8 gears correspond to an A5 curve and a B3 speed regulation rate, 4-6 gears correspond to an A4 curve and a B2 speed regulation rate, and 1-4 gears correspond to an A5 curve and a B0 speed regulation rate;
in the emergency mode, 1-10 gears correspond to an A5 curve and a B1 speed regulation rate;
s2, writing the working mode, the matching relation of the gear and the external characteristic power torque curve, the speed regulation rate, the corresponding parameters and the working parameters of the main pump set in the step S1 into an external controller, wherein the working parameters of the main pump comprise the one-to-one corresponding relation of output pressure P, displacement q and control current i of an electric proportional control valve for controlling the displacement q;
s3, the external controller obtains a control signal, including:
s31, connecting the external controller with an engine controller, and acquiring control input signals of a load connected with the engine through the engine controller, wherein the control input signals comprise the current rotating speed n of the engine and the current output pressure P of a main pumpb；
S32, a monitor instrument display is arranged and connected with the input end of the external controller, and the monitor instrument display is used for selecting the working mode, the external characteristic power torque curve and the speed regulation rate;
and S4, the external controller performs calculation:
the external controller calculates power and torque which are correspondingly matched with the load and speed regulation rate according to the written parameter data in the step S2 and the control input signal data acquired in the step S3, and outputs a power torque instruction and a speed regulation rate setting instruction to the engine controller;
s5, the external controller controls the engine controller and the electric proportional control valve, including:
s51, the engine controller outputs corresponding power torque and rotating speed according to the received power torque instruction, and the engine controller is connected with the main pump through the coupler to transmit power to the main pump;
s52, the engine controller adjusts the speed adjusting rate of the engine through the speed adjuster according to the received speed adjusting rate setting instruction, so that the engine can timely ensure that the engine outputs a corresponding power torque curve and a relatively stable rotating speed in the set speed adjusting rate;
and S53, the external controller is connected with the main pump through an electric proportional control valve, outputs a corresponding instruction to adjust the control current i of the electric proportional control valve, and changes the discharge capacity q of the main pump through the control current i to realize output power control.
2. A multi-curve power matching energy-saving control method for hydraulic engineering machinery is characterized by comprising the following steps:
s1, setting the matching relation between the engine load condition and the engine working gear and the external characteristic power torque curve and the speed regulation, including:
s11, setting four working modes of heavy load H, economy S, light load L and emergency B according to the load of the engine;
s12, five external characteristic power torque curves are set according to the inherent maximum external characteristic power torque curve A0 curve of the engine: the power and the torque of the engine corresponding to a certain rotating speed by the A1 curve, the A2 curve, the A3 curve, the A4 curve and the A5 curve are respectively 100%, 95%, 90%, 85% and 80% of the power and the torque corresponding to the same rotating speed in the A0 curve;
and S13, setting five groups of regulation rates according to the regulation rate B0=5% of the default setting of the engine: b1, B2, B3, B4, B5, B1=8%, B2=10%, B3=15%, B4=18%, B5= 20%;
s14, setting each engine working gear under each working mode, and the matching relation between the corresponding external characteristic power torque curve and the speed regulation rate is as follows:
in the heavy-load H mode, 9-10 gears correspond to an A1 curve and a B5 speed regulation rate, 5-8 gears correspond to an A2 curve and a B4 speed regulation rate, and 1-5 gears correspond to an A3 curve and a B3 speed regulation rate;
in the economic S mode, 8-9 gears correspond to an A2 curve and a B5 speed regulation rate, 5-7 gears correspond to an A3 curve and a B4 speed regulation rate, and 1-5 gears correspond to an A3 curve and a B3 speed regulation rate;
in the light load L mode, 7-8 gears correspond to an A5 curve and a B3 speed regulation rate, 4-6 gears correspond to an A4 curve and a B2 speed regulation rate, and 1-4 gears correspond to an A5 curve and a B0 speed regulation rate;
in the emergency mode, 1-10 gears correspond to an A5 curve and a B1 speed regulation rate;
s2, writing the working mode, the matching relation of the gear and the external characteristic power torque curve, the speed regulation rate, the corresponding parameters and the working parameters of the main pump set in the step S1 into an external controller, wherein the working parameters of the main pump comprise the one-to-one corresponding relation of output pressure P, displacement q and control current i of an electric proportional control valve for controlling the displacement q;
s3, the external controller obtains a control signal, including:
s31, connecting the external controller with an engine controllerAcquiring control input signals of a load connected with the engine through an engine controller, wherein the control input signals comprise the current rotating speed n of the engine and the current output pressure P of a main pumpb；
S32, a monitor instrument display is arranged and connected with the input end of the external controller, and the monitor instrument display is used for selecting the working mode, the external characteristic power torque curve and the speed regulation rate;
and S4, the external controller performs calculation:
the external controller calculates power and torque which are correspondingly matched with the load and speed regulation rate according to the written parameter data in the step S2 and the control input signal data acquired in the step S3, and outputs a power torque instruction and a speed regulation rate setting instruction to the engine controller;
s5, the external controller controls the engine controller and the electric proportional control valve, including:
s51, the engine controller outputs corresponding power torque and rotating speed according to the received power torque instruction, and the engine controller is connected with the main pump through the coupler to transmit power to the main pump;
s52, the engine controller adjusts the speed adjusting rate of the engine through the speed adjuster according to the received speed adjusting rate setting instruction, so that the engine can timely ensure that the engine outputs a corresponding power torque curve and a relatively stable rotating speed in the set speed adjusting rate;
and S53, the external controller is connected with the main pump through an electric proportional control valve, outputs a corresponding instruction to adjust the control current i of the electric proportional control valve, and changes the discharge capacity q of the main pump through the control current i to realize output power control.
3. The multi-curve power matching energy-saving control method for hydraulic engineering machinery as claimed in claim 2, wherein the calibration of throttle parameters can be performed through the monitor display.
4. The multi-curve power-matching energy-saving control method for hydraulic engineering machinery as claimed in claim 2, wherein the working parameters of the main pump further comprise fuel consumption and throttle opening value.
5. The multi-curve power matching energy-saving control method for hydraulic engineering machinery as claimed in claim 2, wherein in step S51, the engine controller is in communication with the engine controller according to the received power torque command, selects the throttle opening parameter, calculates the fuel injection time required by the engine, thereby controlling the fuel injection amount of the engine and further adjusting the engine to operate at the required speed.
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| CN115434819B (en) * | 2022-08-12 | 2024-04-12 | 中联重科股份有限公司 | Method and device for controlling power matching, electronic equipment and engineering machinery |
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