CN111779585A - Control method, device and system of engine for power generation - Google Patents
Control method, device and system of engine for power generation Download PDFInfo
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- CN111779585A CN111779585A CN202010615324.1A CN202010615324A CN111779585A CN 111779585 A CN111779585 A CN 111779585A CN 202010615324 A CN202010615324 A CN 202010615324A CN 111779585 A CN111779585 A CN 111779585A
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
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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
- F02D29/06—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 electric generators
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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
- F02D31/00—Use of speed-sensing governors to control combustion engines, not otherwise provided for
- F02D31/001—Electric control of rotation speed
- F02D31/007—Electric control of rotation speed controlling fuel supply
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/3809—Common rail control systems
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
- F02D2041/1409—Introducing closed-loop corrections characterised by the control or regulation method using at least a proportional, integral or derivative controller
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/023—Temperature of lubricating oil or working fluid
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/024—Fluid pressure of lubricating oil or working fluid
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/04—Engine intake system parameters
- F02D2200/0414—Air temperature
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0602—Fuel pressure
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0606—Fuel temperature
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/101—Engine speed
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The invention relates to the technical field of internal combustion engines, and particularly discloses a control method of an engine for power generation, which comprises the following steps: calculating the target rotating speed of the engine according to the starting signal, the high-low speed change-over switch signal and the parallel operation rotating speed fine adjustment signal; carrying out PID calculation on the difference value between the target rotating speed and the actual rotating speed of the engine to obtain the final virtual accelerator opening; obtaining theoretical oil injection quantity according to the final virtual accelerator opening and the actual rotating speed of the engine, and obtaining external characteristic limited oil quantity according to the actual rotating speed of the engine; obtaining the current value of the final oil injection quantity by taking the minimum value of the theoretical oil injection quantity and the external characteristic limited oil quantity; and carrying out speed regulation control on the engine according to the current value of the final fuel injection quantity. The invention also discloses a control device and a system of the engine for power generation. The control method of the engine for power generation provided by the invention controls the oil injection quantity through the virtual accelerator, saves a mechanical accelerator pedal, and has the advantages of simple structure and convenience in use.
Description
Technical Field
The present invention relates to the technical field of internal combustion engines, and particularly to a control method for a power generation engine, a control device for a power generation engine, and a control system for a power generation engine including the control device for a power generation engine.
Background
With the increasing strictness of emission regulations and the improvement of the use requirements of people on engines, the electric-regulation engine applied to the field of power generation at the present stage cannot meet the higher requirements of the market and users due to the defects of complex equipment, poor transient speed regulation performance and stability, high oil consumption and the like. Therefore, the application of the electric control engine to the field of power generation is a great trend, but the existing electric control fuel system is mainly a control system developed for an automobile engine, the change of the rotating speed of the existing electric control fuel system is controlled by adopting a mechanical accelerator pedal, and the automatic speed regulation cannot be carried out, so the electric control fuel system cannot be directly used in the field of power generation and must be developed secondarily.
In the prior art, two methods are mainly provided for carrying out secondary development on an electric control fuel system and applying the electric control fuel system to the field of power generation. First, chinese patent "an automatic electronic speed regulation device and method for high-pressure common rail diesel engine" (CN105888864B) discloses an automatic electronic speed regulation device for high-pressure common rail diesel engine, which additionally adds a whole set of external control circuits such as PID regulation circuit, output processing and protection circuit, and rotation speed processing and conditioning circuit on the basis of the original high-pressure common rail system, and although the automatic speed regulation of the engine for power generation is realized, the device has a complex structure, too high cost, inconvenient maintenance and no application value. Secondly, chinese patent "engine control method, device and power generation equipment for power generation" (CN103321767B) proposes an engine control method and device for power generation, which obtains a torque by obtaining a difference between a set engine speed and an actual engine speed to perform PID calculation, and then converts the torque into an oil mass, so that the existing electronic control fuel system meets the power generation requirement, but it does not relate to a process of how to calculate a target speed and how to convert the target speed into the torque by using the speed difference and simultaneously convert the torque into the oil injection mass when the engine is in a specific working condition, and the method of converting the torque into the oil mass is derived from a torque control strategy of the vehicle engine.
Disclosure of Invention
Aiming at the defects and shortcomings in the prior art, the invention provides a control method of an engine for power generation, a control device of the engine for power generation and a control system of the engine for power generation comprising the control device of the engine for power generation, which omits a mechanical accelerator pedal, has the characteristics of simple structure, convenient use, good engine stability and good transient speed regulation performance, and is suitable for various power generation equipment.
As a first aspect of the present invention, there is provided a control method of an engine for power generation, comprising:
acquiring the actual rotating speed of an engine, and a starting signal, a high-low speed change-over switch signal and a parallel operation rotating speed fine adjustment signal output by a generator controller;
calculating the target rotating speed of the engine according to the starting signal, the high-low speed change-over switch signal and the parallel operation rotating speed fine adjustment signal;
carrying out PID calculation on the difference value between the target rotating speed and the actual rotating speed of the engine to obtain the final virtual accelerator opening;
inquiring an oil mass MAP of a speed regulation characteristic curve according to the final virtual accelerator opening and the actual rotating speed of the engine to obtain theoretical oil injection quantity, and inquiring an external characteristic oil mass limiting curve according to the actual rotating speed of the engine to obtain external characteristic limited oil mass;
taking the minimum value of the theoretical oil injection quantity and the external characteristic limited oil quantity to obtain the current value of the final oil injection quantity;
and carrying out speed regulation control on the engine according to the current value of the final fuel injection quantity.
Further, the calculating the target rotation speed of the engine according to the starting signal, the high-low speed change-over switch signal and the parallel operation rotation speed fine adjustment signal includes:
when the engine is in a stop state or the generator controller outputs the starting signal to the electronic control unit ECU, the target rotating speed of the engine is the target idling speed of the engine;
after the engine is started to the target idling stable operation, when the generator controller outputs a high-level high-low speed change-over switch signal to the electronic control unit ECU and does not output the parallel operation rotating speed fine adjustment signal, the target rotating speed of the engine is the target rated rotating speed of the engine;
after the engine is started to the target idling stable operation, when the generator controller outputs a high-level high-low speed change-over switch signal and the parallel operation rotating speed fine adjustment signal to the electronic control unit ECU, the target rotating speed of the engine is the target rated rotating speed of the engine plus the correction value of the parallel operation rotating speed fine adjustment;
when the engine is in a running state, the generator controller outputs a low-level high-low speed change-over switch signal to the electronic control unit ECU, and the target rotating speed of the engine is the target idling speed of the engine.
Further, the calculating the difference between the target rotating speed and the actual rotating speed of the engine by using PID to obtain the final virtual accelerator opening degree includes:
calculating a rotation speed difference according to a target rotation speed and an actual rotation speed of the engine;
acquiring the final fuel injection quantity sprayed to the engine by the fuel injector;
inquiring three-dimensional MAP according to the rotating speed difference and the final oil injection quantity to respectively obtain a proportional coefficient, an integral coefficient and a differential coefficient;
respectively calculating the proportional coefficient, the integral coefficient and the differential coefficient to correspondingly obtain a virtual accelerator proportional term, a virtual accelerator integral term and a virtual accelerator differential term;
and performing virtual accelerator calculation according to the virtual accelerator proportional term, the virtual accelerator integral term and the virtual accelerator differential term to obtain the final virtual accelerator opening.
As another aspect of the present invention, there is provided a control device of an engine for power generation, including:
the acquisition module is used for acquiring the actual rotating speed of the engine, and a starting signal, a high-low speed change-over switch signal and a parallel operation rotating speed fine adjustment signal which are output by the generator controller;
the first calculation module is used for calculating the target rotating speed of the engine according to the starting signal, the high-low speed change-over switch signal and the parallel operation rotating speed fine adjustment signal;
the second calculation module is used for carrying out PID calculation on the difference value between the target rotating speed and the actual rotating speed of the engine to obtain the final virtual accelerator opening;
the third calculation module is used for inquiring the oil mass MAP of the speed regulation characteristic curve according to the final virtual accelerator opening and the actual rotating speed of the engine to obtain a theoretical oil injection quantity, inquiring the external characteristic oil mass limit curve according to the actual rotating speed of the engine to obtain an external characteristic limited oil mass, and taking the minimum value of the theoretical oil injection quantity and the external characteristic limited oil mass to obtain a final oil injection quantity current value;
and the speed regulation control module is used for carrying out speed regulation control on the engine according to the current value of the final fuel injection quantity.
As another aspect of the present invention, there is provided a control system of an engine for power generation, including: the system comprises a generator controller, an engine and an electric control fuel system, wherein the electric control fuel system comprises an electric control unit ECU, a high-pressure oil supply pump assembly, a high-pressure oil rail assembly, an oil sprayer assembly and a sensor; the electronic control unit ECU comprises the control device of the engine for power generation, the high-pressure oil supply pump assembly comprises an oil transfer pump, a high-pressure oil supply pump and a fuel metering valve, the high-pressure oil rail assembly comprises a high-pressure oil rail, an electronic control pressure relief valve and a pressure limiting valve, and the fuel injector assembly comprises a fuel injector and a fuel injector electromagnetic valve;
the electric control unit ECU is connected with the generator controller through a wire harness to obtain a control signal of a target rotating speed of the generator controller;
the electronic control unit ECU is connected with the sensor through a wire harness to acquire the acquired signals;
and the electronic control unit ECU is connected with the fuel metering valve, the electronic control pressure relief valve and the oil injector electromagnetic valve through a wire harness to control the fuel metering valve, the electronic control pressure relief valve and the oil injector electromagnetic valve to work.
Further, the sensors comprise a rail pressure sensor, a crankshaft speed sensor, a cam speed sensor and a pressure temperature sensor, and a rail pressure signal, an engine speed signal and a pressure temperature sensor signal are obtained.
Further, the pressure and temperature sensor comprises one or more of an oil pressure and temperature sensor, a cooling liquid temperature sensor, a boost pressure and temperature sensor and a fuel pressure and temperature sensor.
Further, the oil injector is a non-leakage oil injector; the electric control pressure relief valve is a quick pressure relief type electromagnetic valve and is controlled by PWM signals output by an electric control unit ECU.
Further, the electronic control unit ECU acquires relevant parameters of the running state of the engine according to signals acquired by the sensor, judges whether the parameters exceed a safety threshold value or not, and protects the engine through speed limitation, torque limitation or shutdown if the parameters exceed the safety threshold value.
Further, the relevant parameters of the engine operation state comprise one or more of engine speed, coolant temperature, oil pressure, oil temperature, boost pressure, intake air temperature, exhaust gas temperature, fuel pressure and fuel temperature.
The control method of the engine for power generation provided by the invention has the following advantages:
(1) according to the invention, PID calculation is carried out based on the difference value between the target rotating speed and the actual rotating speed of the engine to obtain a virtual accelerator opening, the oil injection quantity is controlled through the virtual accelerator, a mechanical accelerator pedal is omitted, the structure is simple, and the use is convenient;
(2) the engine speed control method has the advantages that the final fuel injection quantity is obtained according to the simultaneous action of the speed regulation characteristic curve MAP and the external characteristic fuel quantity limiting curve to carry out the speed regulation control of the engine, and the most appropriate speed regulation rate is adopted to carry out the rotation speed control under different power generation working conditions, so that the engine has good stability and transient speed regulation performance;
(3) the invention can automatically control the rotating speed according to the generator controller or other power generation requirements, and can simultaneously be compatible with two power generation engine control modes, namely a constant rotating speed control mode (N-Governor) and a parallel operation rotating speed fine adjustment control mode, thereby being suitable for various power generation equipment.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
Fig. 1 is a flowchart of a control method of an engine for power generation according to the present invention.
Fig. 2 is a flowchart of an embodiment of a control method of an engine for power generation according to the present invention.
Fig. 3 is a schematic structural diagram of a control system of an engine for power generation according to the present invention.
Fig. 4 is a schematic diagram of a speed regulation characteristic curve and an external characteristic oil amount limiting curve of the embodiment of the present invention.
In the figure: 1-a generator controller; 2-an engine; 3-an electronic control fuel system; 31-an ECU; 32-a high pressure supply pump assembly; 321-an oil transfer pump; 322-high pressure feed pump; 323-fuel metering valve; 33-a high pressure oil rail assembly; 331-high pressure oil rail; 332-an electrically controlled pressure relief valve; 333-pressure limiting valve; 34-a fuel injector assembly; 341-injector solenoid valve; 342-a fuel injector; 35-a sensor; 351-rail pressure sensor; 352-crankshaft speed sensor; 353-cam speed sensor; 354-pressure temperature sensor; 4-harness; 5-a first calculation module; 51-start signal; 52-high and low speed change-over switch signal; 53-parallel operation rotating speed fine adjustment signal; 54-engine target speed calculation; 6-a second calculation module; 61-engine target speed; 62-actual engine speed; 63; PID calculation; 64-virtual throttle ratio term; 65-virtual throttle integral term; 66-virtual throttle derivative term; 67-virtual throttle opening calculation; 7-a third calculation module; 71-final virtual throttle opening; 72-speed governing characteristic curve oil mass MAP; 73-outer characteristic oil mass limit curve; 74-theoretical oil injection quantity; 75-external characteristic limit oil volume; 76-current value of final fuel injection quantity.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution 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 the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged under appropriate circumstances in order to facilitate the description of the embodiments of the invention herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the present embodiment, a control method of an engine for power generation is provided, fig. 1 is a flowchart of a control method of an engine for power generation according to the present invention, and fig. 2 is a flowchart of an embodiment of a control method of an engine for power generation according to the present invention.
The following describes a specific implementation of the control method for the power generation engine according to the embodiment of the present invention with reference to fig. 1 and 2.
Referring to fig. 2 together with fig. 1, a method for controlling an engine for power generation includes:
s110, acquiring the actual rotating speed 62 of the engine and a starting signal 51, a high-low speed change-over switch signal 52 and a parallel operation rotating speed fine adjustment signal 53 output by a generator controller;
s120, calculating a target rotating speed 61 of the engine according to the starting signal 51, the high-low speed change-over switch signal 52 and the parallel operation rotating speed fine adjustment signal 53;
s130, carrying out PID calculation 63 on the difference value between the target rotating speed 61 and the actual rotating speed 62 of the engine to obtain a final virtual accelerator opening 71;
s140, inquiring an oil mass MAP72 of a speed regulation characteristic curve according to the final virtual accelerator opening 71 and the actual rotating speed 62 of the engine to obtain a theoretical oil injection mass 74, and inquiring an external characteristic oil mass limiting curve 73 according to the actual rotating speed 62 of the engine to obtain an external characteristic limited oil mass 75;
s150, taking the minimum value of the theoretical oil injection quantity 74 and the external characteristic limited oil quantity 75 to obtain a current value 76 of a final oil injection quantity;
and S160, carrying out speed regulation control on the engine according to the current value 76 of the final fuel injection quantity.
Specifically, the calculating the target rotating speed of the engine according to the starting signal, the high-low speed change-over switch signal and the parallel operation rotating speed fine adjustment signal comprises:
when the engine is in a stop state or the generator controller outputs the starting signal to the electronic control unit ECU, the target rotating speed of the engine is the target idling speed of the engine;
after the engine is started to the target idling stable operation, when the generator controller outputs a high-level high-low speed change-over switch signal to the electronic control unit ECU and does not output the parallel operation rotating speed fine adjustment signal, the target rotating speed of the engine is the target rated rotating speed of the engine;
after the engine is started to the target idling stable operation, when the generator controller outputs a high-level high-low speed change-over switch signal and the parallel operation rotating speed fine adjustment signal to the electronic control unit ECU, the target rotating speed of the engine is the target rated rotating speed of the engine plus the correction value of the parallel operation rotating speed fine adjustment;
when the engine is in a running state, the generator controller outputs a low-level high-low speed change-over switch signal to the electronic control unit ECU, and the target rotating speed of the engine is the target idling speed of the engine.
Specifically, as shown in fig. 2, the calculating the difference between the target rotation speed and the actual rotation speed of the engine by PID to obtain the final virtual accelerator opening degree includes:
calculating 54 the target rotating speed of the engine according to the starting signal 51, the high-low speed change-over switch signal 52 and the parallel operation rotating speed fine adjustment signal 53;
calculating a speed difference based on a target speed 61 and an actual speed 62 of the engine, the speed difference being equal to the target speed 61 minus the actual speed 62;
acquiring the final fuel injection quantity sprayed to the engine by the fuel injector;
inquiring three-dimensional MAP according to the rotating speed difference and the final oil injection quantity to respectively obtain a proportional coefficient, an integral coefficient and a differential coefficient;
respectively calculating the proportional coefficient, the integral coefficient and the differential coefficient to correspondingly obtain a virtual accelerator proportional term 64, a virtual accelerator integral term 65 and a virtual accelerator differential term 66;
and calculating 67 the virtual accelerator opening according to the virtual accelerator proportional term 64, the virtual accelerator integral term 65 and the virtual accelerator differential term 66 to obtain a final virtual accelerator opening 71.
Further specifically, the three-dimensional MAP is inquired according to the rotating speed difference and the final oil injection quantity to respectively obtain a proportional coefficient, an integral coefficient and a differential coefficient; respectively calculating the proportional coefficient, the integral coefficient and the differential coefficient to correspondingly obtain a virtual accelerator proportional term 64, a virtual accelerator integral term 65 and a virtual accelerator differential term 66, wherein the method comprises the following steps:
inquiring a three-dimensional MAP of a rotating speed control proportional coefficient according to the rotating speed difference and the final oil injection quantity to obtain a proportional coefficient, and performing PID calculation 63 on the proportional coefficient and the rotating speed difference to obtain a virtual accelerator proportional term 64;
inquiring a three-dimensional MAP of a rotating speed control integral coefficient according to the rotating speed difference and the final fuel injection quantity to obtain an integral coefficient, carrying out PID calculation 63 on the integral coefficient and the rotating speed difference to obtain a virtual accelerator integral term 65, and carrying out integral freezing when the rotating speed difference is out of a certain range (for example, -100 rpm) to prevent system oscillation caused by integral saturation, and carrying out integral calculation in the range;
inquiring a three-dimensional MAP of a speed control differential coefficient according to the speed difference and the final fuel injection quantity to obtain a differential coefficient, and carrying out PID calculation 63 on the differential coefficient and the change rate of the actual engine speed 62 to obtain a virtual accelerator differential term 66, wherein the change rate of the actual engine speed 62 is equal to the time interval after the actual engine speed at the current moment is subtracted by the actual engine speed at the previous moment;
wherein, taking the proportionality coefficient as an example, the three-dimensional MAP of the rotation speed control proportionality coefficient is shown in the following table:
x-axis rotation speed difference (r/min) Y-axis final fuel injection quantity (mg/cyc)
In the table, the X axis is the rotation speed difference, the Y axis is the final oil injection quantity, and the corresponding numerical value in the table is the proportional coefficient obtained by inquiring the three-dimensional MAP through the rotation speed difference and the final oil injection quantity.
According to the control method of the engine for power generation provided by the embodiment of the invention, PID (proportion integration differentiation) calculation is carried out on the basis of the difference value between the target rotating speed and the actual rotating speed of the engine to obtain the virtual accelerator opening, the oil injection quantity is controlled by the virtual accelerator, a mechanical accelerator pedal is omitted, the structure is simple, and the use is convenient.
As another embodiment of the present invention, there is provided a control device of an engine for power generation, including:
the acquisition module is used for acquiring the actual rotating speed of the engine, and a starting signal, a high-low speed change-over switch signal and a parallel operation rotating speed fine adjustment signal which are output by the generator controller;
the first calculation module 5 is used for calculating a target rotating speed 61 of the engine according to the starting signal 51, the high-low speed change-over switch signal 52 and the parallel operation rotating speed fine adjustment signal 53;
the second calculation module 6 is used for performing PID calculation 63 on the difference value between the target rotating speed 61 and the actual rotating speed 62 of the engine to obtain a final virtual accelerator opening 71;
the third calculating module 7 is configured to query a speed regulation characteristic curve oil mass MAP72 according to the final virtual accelerator opening 71 and the actual rotation speed 62 of the engine to obtain a theoretical oil injection mass 74, query an external characteristic oil mass limit curve 73 according to the actual rotation speed 62 of the engine to obtain an external characteristic limited oil mass 75, and obtain a minimum value between the theoretical oil injection mass 74 and the external characteristic limited oil mass 75 to obtain a final oil injection mass current value 76;
and the speed regulation control module is used for carrying out speed regulation control on the engine according to the current value 76 of the final fuel injection quantity.
As another embodiment of the present invention, there is provided a control system for an engine for power generation, as shown in fig. 3, including: the system comprises a generator controller 1, an engine 2 and an electronic control fuel system 3, wherein the electronic control fuel system 3 comprises an electronic control unit ECU31, a high-pressure oil supply pump assembly 32, a high-pressure oil rail assembly 33, an oil injector assembly 34 and a sensor 35; the ECU31 includes the control device of the power generation engine described above, the high-pressure fuel supply pump assembly 32 includes the fuel delivery pump 321, the high-pressure fuel supply pump 322, and the fuel metering valve 323, the high-pressure fuel rail assembly 33 includes the high-pressure fuel rail 331, the electronically controlled relief valve 332, and the pressure limiting valve 333, and the fuel injector assembly 34 includes the fuel injector 342 and the fuel injector solenoid valve 341;
the electronic control unit ECU31 is connected with the generator controller 1 through a wire harness 4 to obtain a control signal of a target rotating speed;
the electronic control unit ECU31 is connected with the sensor 35 through a wire harness 4 to acquire the acquired signals;
the electronic control unit ECU31 is connected with the fuel metering valve 323, the electronic control pressure relief valve 332 and the fuel injector electromagnetic valve 341 through a wire harness 4, and controls the fuel metering valve 323, the electronic control pressure relief valve 332 and the fuel injector electromagnetic valve 341 to work.
Specifically, the sensors 35 include a rail pressure sensor 351, a crankshaft speed sensor 352, a cam speed sensor 353, and a pressure temperature sensor 354 that acquire a rail pressure signal, an engine speed signal, and a pressure temperature sensor signal.
Specifically, the high-pressure fuel supply pump assembly 32 is used for supplying fuel required by the normal operation of the engine 2, the fuel in the fuel tank is sucked out by the fuel delivery pump 321, enters the high-pressure fuel supply pump 322, and enters the high-pressure fuel rail assembly 33 after being compressed; the fuel metering valve 323 is mounted on the high-pressure fuel supply pump 322 and is controlled by the ECU31 to regulate the flow rate of fuel from the high-pressure fuel supply pump 322 into the high-pressure fuel rail assembly 33;
the high-pressure oil rail assembly 33 is connected with the high-pressure oil supply pump assembly 32 and the oil injector assembly 34 and used for storing high-pressure fuel oil and playing a role in pressure accumulation; the electric control pressure relief valve 332 and the pressure limiting valve 333 are arranged on the high-pressure oil rail 331; the electronic control pressure relief valve 332 is an electromagnetic valve capable of quickly relieving pressure, PWM (pulse width modulation) control is output by the ECU31, and when the difference value between the actual rail pressure and the target rail pressure is overlarge, the electronic control pressure relief valve 332 is opened so as to reduce the rail pressure; the pressure limiting valve 333 is used for limiting the highest rail pressure of the electric control fuel system 3, and when the rail pressure exceeds a design limit value, the pressure limiting valve 333 is opened to reduce the rail pressure to a safety range;
the injector assembly 34 atomizes the high-pressure fuel into the combustion chambers of the engine 2 at the optimum injection timing, injection quantity and injection rate in response to signals from the ECU 31.
Specifically, the pressure and temperature sensor 354 includes one or more of an oil pressure and temperature sensor, a coolant temperature sensor, a boost pressure and temperature sensor, and a fuel pressure and temperature sensor.
Specifically, the fuel injector 342 is a non-leakage fuel injector; the electronic control pressure relief valve 332 is a quick pressure relief type electromagnetic valve and is controlled by a PWM signal output by an electronic control unit ECU.
Specifically, the ECU31 obtains the relevant parameters of the running state of the engine 2 according to the signals collected by the sensor 35, and determines whether the parameters exceed a safety threshold, and if it is determined that the parameters exceed the safety threshold, the engine 2 is protected by limiting speed, torque or stopping.
Specifically, the electronic control unit ECU31 transmits the relevant sensor signals it collects and its self-checking diagnostic failure information to the generator controller 1 through CAN communication.
Specifically, the relevant parameters of the engine operation state comprise one or more of engine speed, coolant temperature, oil pressure, oil temperature, boost pressure, intake air temperature, exhaust gas temperature, fuel pressure and fuel temperature. Once the ECU31 detects that the relevant parameters of the engine exceed the set safety threshold, an alarm is sent to the generator controller 1, and the engine 2 is subjected to speed limit, torque limit or stop processing according to the requirements of the generator controller 1 or the setting of the ECU31 so as to protect the engine 2.
The control system of the engine for power generation provided by the embodiment of the invention performs PID calculation based on the difference value between the target rotating speed and the actual rotating speed of the engine to obtain a virtual accelerator opening, and then performs speed regulation control on the engine by obtaining the final fuel injection quantity according to the simultaneous action of the speed regulation characteristic curve MAP and the external characteristic fuel quantity limiting curve, thereby omitting a mechanical accelerator pedal.
As shown in fig. 4, a schematic diagram of a speed-regulating characteristic curve and an external characteristic oil-quantity limiting curve of the embodiment of the present invention is shown, where a thin solid line is a theoretical oil-injection quantity curve (i.e., a speed-regulating characteristic curve) corresponding to different virtual accelerator opening degrees and different engine rotation speeds, and a top line is a theoretical oil-injection quantity curve corresponding to 100% of the virtual accelerator opening degree; the thick solid line is an external characteristic oil quantity limit curve; the corresponding point of the rated rotating speed n and the fuel injection quantity m is the rated working condition of the engine, and the corresponding point of the rated rotating speed n and the fuel injection quantity q is the 110% load working condition of the engine, and the rated rotating speed n and the fuel injection quantity q are all within the external characteristic fuel quantity limit curve of the engine.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (10)
1. A method of controlling an engine for power generation, characterized by comprising:
acquiring the actual rotating speed of an engine, and a starting signal, a high-low speed change-over switch signal and a parallel operation rotating speed fine adjustment signal output by a generator controller;
calculating the target rotating speed of the engine according to the starting signal, the high-low speed change-over switch signal and the parallel operation rotating speed fine adjustment signal;
carrying out PID calculation on the difference value between the target rotating speed and the actual rotating speed of the engine to obtain the final virtual accelerator opening;
inquiring an oil mass MAP of a speed regulation characteristic curve according to the final virtual accelerator opening and the actual rotating speed of the engine to obtain theoretical oil injection quantity, and inquiring an external characteristic oil mass limiting curve according to the actual rotating speed of the engine to obtain external characteristic limited oil mass;
taking the minimum value of the theoretical oil injection quantity and the external characteristic limited oil quantity to obtain the current value of the final oil injection quantity;
and carrying out speed regulation control on the engine according to the current value of the final fuel injection quantity.
2. The method of controlling an engine for power generation according to claim 1, wherein the calculating a target rotational speed of the engine based on the start signal, the high-low speed changeover switch signal, and the parallel operation rotational speed fine adjustment signal includes:
when the engine is in a stop state or the generator controller outputs the starting signal to the electronic control unit ECU, the target rotating speed of the engine is the target idling speed of the engine;
after the engine is started to the target idling stable operation, when the generator controller outputs a high-level high-low speed change-over switch signal to the electronic control unit ECU and does not output the parallel operation rotating speed fine adjustment signal, the target rotating speed of the engine is the target rated rotating speed of the engine;
after the engine is started to the target idling stable operation, when the generator controller outputs a high-level high-low speed change-over switch signal and the parallel operation rotating speed fine adjustment signal to the electronic control unit ECU, the target rotating speed of the engine is the target rated rotating speed of the engine plus the correction value of the parallel operation rotating speed fine adjustment;
when the engine is in a running state, the generator controller outputs a low-level high-low speed change-over switch signal to the electronic control unit ECU, and the target rotating speed of the engine is the target idling speed of the engine.
3. The control method of the engine for power generation according to claim 1, wherein the PID-calculating a difference between a target rotation speed and an actual rotation speed of the engine to obtain a final virtual accelerator opening degree includes:
calculating a rotation speed difference according to a target rotation speed and an actual rotation speed of the engine;
acquiring the final fuel injection quantity sprayed to the engine by the fuel injector;
inquiring three-dimensional MAP according to the rotating speed difference and the final oil injection quantity to respectively obtain a proportional coefficient, an integral coefficient and a differential coefficient;
respectively calculating the proportional coefficient, the integral coefficient and the differential coefficient to correspondingly obtain a virtual accelerator proportional term, a virtual accelerator integral term and a virtual accelerator differential term;
and performing virtual accelerator calculation according to the virtual accelerator proportional term, the virtual accelerator integral term and the virtual accelerator differential term to obtain the final virtual accelerator opening.
4. A control device for a power generation engine, characterized by comprising:
the acquisition module is used for acquiring the actual rotating speed of the engine, and a starting signal, a high-low speed change-over switch signal and a parallel operation rotating speed fine adjustment signal which are output by the generator controller;
the first calculation module is used for calculating the target rotating speed of the engine according to the starting signal, the high-low speed change-over switch signal and the parallel operation rotating speed fine adjustment signal;
the second calculation module is used for carrying out PID calculation on the difference value between the target rotating speed and the actual rotating speed of the engine to obtain the final virtual accelerator opening;
the third calculation module is used for inquiring the oil mass MAP of the speed regulation characteristic curve according to the final virtual accelerator opening and the actual rotating speed of the engine to obtain a theoretical oil injection quantity, inquiring the external characteristic oil mass limit curve according to the actual rotating speed of the engine to obtain an external characteristic limited oil mass, and taking the minimum value of the theoretical oil injection quantity and the external characteristic limited oil mass to obtain a final oil injection quantity current value;
and the speed regulation control module is used for carrying out speed regulation control on the engine according to the current value of the final fuel injection quantity.
5. A control system of an engine for power generation, characterized by comprising: the system comprises a generator controller, an engine and an electric control fuel system, wherein the electric control fuel system comprises an electric control unit ECU, a high-pressure oil supply pump assembly, a high-pressure oil rail assembly, an oil sprayer assembly and a sensor; wherein the ECU comprises the control device of the engine for power generation of claim 4, the high-pressure fuel feed pump assembly comprises a fuel delivery pump, a high-pressure fuel feed pump and a fuel metering valve, the high-pressure fuel rail assembly comprises a high-pressure fuel rail, an electrically controlled pressure relief valve and a pressure limiting valve, and the fuel injector assembly comprises a fuel injector and a fuel injector solenoid valve;
the electric control unit ECU is connected with the generator controller through a wire harness to obtain a control signal of a target rotating speed of the generator controller;
the electronic control unit ECU is connected with the sensor through a wire harness to acquire the acquired signals;
and the electronic control unit ECU is connected with the fuel metering valve, the electronic control pressure relief valve and the oil injector electromagnetic valve through a wire harness to control the fuel metering valve, the electronic control pressure relief valve and the oil injector electromagnetic valve to work.
6. The control system of an engine for power generation according to claim 5, wherein the sensors include a rail pressure sensor, a crankshaft rotational speed sensor, a cam rotational speed sensor, and a pressure temperature sensor, and the rail pressure signal, the engine rotational speed signal, and the pressure temperature sensor signal are obtained.
7. The control system of an engine for power generation according to claim 6, wherein said pressure-temperature sensor includes one or more of an oil pressure-temperature sensor, a coolant temperature sensor, a boost pressure-temperature sensor, and a fuel pressure-temperature sensor.
8. The control system of an engine for power generation according to claim 5, characterized in that the fuel injector is a non-leakage fuel injector; the electric control pressure relief valve is a quick pressure relief type electromagnetic valve and is controlled by PWM signals output by an electric control unit ECU.
9. The control system of the engine for power generation as claimed in claim 5, wherein the ECU obtains relevant parameters of the engine running state according to the signals collected by the sensor, judges whether the parameters exceed a safety threshold value, and protects the engine by limiting speed, limiting torque or stopping if the parameters are determined to exceed the safety threshold value.
10. The control system of an engine for power generation according to claim 9, wherein the parameter relating to the engine operating state includes one or more of an engine speed, a coolant temperature, an oil pressure, an oil temperature, a boost pressure, an intake air temperature, an exhaust gas temperature, a fuel pressure, and a fuel temperature.
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