CN103982308B - The control system of the oil gas dual-fuel electromotor of automatically controlled fuel feeding and control method thereof - Google Patents
The control system of the oil gas dual-fuel electromotor of automatically controlled fuel feeding and control method thereof Download PDFInfo
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- 238000002347 injection Methods 0.000 claims abstract description 68
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- 239000001301 oxygen Substances 0.000 claims abstract description 28
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- 230000033228 biological regulation Effects 0.000 claims description 5
- 239000000498 cooling water Substances 0.000 claims description 4
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- 238000007689 inspection Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 abstract description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 24
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Classifications
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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
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Output Control And Ontrol Of Special Type Engine (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The control system of the oil gas dual-fuel electromotor of automatically controlled fuel feeding and control method thereof, including high-pressure common-rail injection system, gas injection system and oil/gas double fuel electric-control system, oil/gas double fuel electric-control system includes Sensor section, executor, double fuel ECU and fuel oil ECU, this control system controls diesel oil amount by fuel injector, Jet control gas quantity is controlled by combustion gas, intake air amount is controlled by electronic air throttle body, the air-fuel ratio of electromotor work is controlled by broad domain oxygen sensor detection and closed loop feedback, this control method can make electromotor switch under pure fuel oil service pattern and oil and gas double fuel mode of operation, and control electromotor and well run, diesel injection amount can be accurately controlled according to the duty that Diesel engine is different, time for spraying and the injection duration of gaseous fuel can be controlled simultaneously, intake air amount and air-fuel ratio, thus ensureing that dual fuel engine safety and steady runs, lower fuel consumption, reduce exhaust emissions。
Description
Technical field
The invention belongs to technical field of engine control, be specifically related to control system and the control method thereof of the oil gas dual-fuel electromotor of a kind of automatically controlled fuel feeding。
Background technology
Along with the day of petroleum resources is becoming tight, world's fuel price rises violently again and again, the oil price of China is also one rise and rise again, on the earth gaseous fuel of rich reserves such as natural gas, because its there is price advantage compared with petrol and diesel oil, and there is better environmental-protecting performance, its use can effectively reduce the use cost of diesel engine, alleviate the problem such as the shortage of the energy, solution exhaust emission, thus to develop gaseous propellant engine。And diesel oil/gaseous fuel dual fuel engine (being called for short oil gas dual-fuel electromotor) is exactly a kind of gaseous propellant engine。Existing diesel oil/gaseous fuel dual fuel engine, such as diesel/natural gas dual-fuel engine, diesel oil/liquefied petroleum gas (LPG) dual fuel engine, on the basis of Diesel engine and diesel oil electronic control system, usually install gaseous fuel additional control system and obtain, the problem that this electromotor is usually present three aspects, one is the control problem of Pilot diesel quantity, during electromotor work dual fuel mode, owing to diesel oil burning-point is low, primarily serve first pressuring combustion ignition to ignite the effect of combustion gas, in order to pursue economic index, diesel oil amount only accounts for the 5～20% of total fuel quantity, when so little amount, its control stability and precision difficulty are big；Two is that thermic load is higher, compared with former diesel engine, due to the after-burning that the burning velocity of gaseous fuel such as natural gas produces slowly after burn gas fuel, in addition compression ratio generally still keep the high compression ratio of former diesel engine to cause the thermic load of parts is high and have impact on life-span of electromotor；Three is the discharge of methane height of some gaseous fuel such as natural gas, the main component of such as natural gas is methane, the ignition temperature of methane about 630 DEG C is much higher than 260 DEG C of diesel oil, and in cylinder, gaseous mixture is rarer during dual fuel engine sub-load, internal cylinder temperature is relatively low and causes that the methane of some temperature lower regions can not burn and form high discharge of methane, and causes methane waste to have impact on the economic performance of electromotor。The existence of above-mentioned three aspect problems, affects the safety and reliability that electromotor runs, adds consumption and the exhaust emissions of fuel simultaneously。
Existing invention CN201110291569.4 proposes control method and the device of a kind of oil gas for electronically controlled unit pump, electrically-controlled pump nozzle or electric-controlled co-rail diesel oil/gaseous fuel dual fuel engine, it is retaining on the basis of former machine engine control system, increasing diesel and combustion gas control unit that this dual fuel engine controls system。Each signal of former machine (water temperature, boost pressure and temperature, rail pressure, etc.), shared by the electric-control system of dual-fuel control system and former machine。The double fuel control unit increased can control diesel injection (control of diesel injector electromagnetic valve) and the gas injection system (including the control of gas nozzle electromagnetic valve, gas switch valve control, combustion gas liquid level, pressure and temperature monitoring etc.) installed additional, and the miscellaneous part of former machine (such as rail pressure, air system (VGT, EGR etc.)) is still controlled by former machine system。The control of the diesel injection of former machine, is switched over by outside relay, and this relay, by dual-fuel control system control, can obtain pure diesel oil state and two kinds of mode of operations of double fuel by controlling this relay。But this invention there is also the shortcomings such as safety and reliability is strong not that structure optimizes not, electromotor runs。
Summary of the invention
It is an object of the invention to provide the control system of the oil gas dual-fuel electromotor of a kind of automatically controlled fuel feeding and control method thereof, control system and the control method Problems existing of the oil gas of the diesel oil/combustion gas dual fuel engine of existing electric-controlled co-rail, electronically controlled unit pump or electrically-controlled pump nozzle fuel feeding can be improved, current main flow diesel oil electric-control system can be merged more easily, making dual fuel engine control system more accurate, electromotor runs more safe and reliable, economy, environmental protection。
For achieving the above object, the technical solution used in the present invention is as follows:
The control system of the oil gas dual-fuel electromotor of a kind of automatically controlled fuel feeding, including high-pressure common-rail injection system, gas injection system and oil/gas double fuel electric-control system；
High-pressure common-rail injection system includes the fuel tank, filter, high-pressure oil pump and the high-pressure common-rail pipe that are sequentially connected；
The combustion gas that gas injection system includes being arranged on connecting line controls nozzle, burnt gas switch main valve, gas pressure regulation valve and gas distribution pipe；
Oil/gas double fuel electric-control system includes Sensor section, executor and gathers the signal of Sensor section and control the double fuel ECU and fuel oil ECU (electronic control unit) of executor's running；
The input signal processing module that wherein double fuel ECU includes the signal for receiving Sensor section collection, the output interface driving module being connected with executor and the microprocessor driving module to be connected with signal processing module and output interface, be additionally provided with fuel injector fictitious load in double fuel ECU；It is provided with fuel injector drive output in fuel oil ECU, and fuel injector drive output is connected with input signal processing module and fuel injector fictitious load；
Executor includes the hydraulic oil pump control valve being connected with fuel ECU, and controls nozzle with the double fuel ECU fuel injector being connected and combustion gas；
Sensor section includes the cooling-water temperature sensor being positioned on engine body being simultaneously connected with fuel oil ECU and double fuel ECU, be positioned at air-distributor pressure temperature sensor on inlet manifold and or intake flow sensor, it is positioned at the crankshaft position sensor of engine flywheel end, it is positioned at the CMPS Camshaft Position Sensor at cam of injection pump axle or inlet and exhaust valve camshaft place and for detecting the accelerator pedal position sensor of accelerator pedal position, and be connected with double fuel ECU control the gaseous-pressure of nozzle inlet place gaseous-pressure and temperature and temperature sensor and the combustion gas liquid level being arranged in gas storage tank or pressure transducer for measuring combustion gas。
Described output interface drives module to include controlling the combustion gas control nozzle driving module that nozzle is connected and the fuel injector driving module being connected with fuel injector with combustion gas。
Described executor also includes the electronic air throttle body for engine charge air mass flow is controlled, described output interface drives the electronic throttle that module also includes being connected with electronic air throttle body to drive module, described Sensor section also includes the TPS being positioned on electronic air throttle body, and TPS is connected with input signal processing module。
Described Sensor section also includes the broad domain oxygen sensor for measuring electromotor work air-fuel ratio, and broad domain oxygen sensor is installed on exhaust main or exhaustor；Described executor also includes broad domain oxygen sensor and controls end；Described output interface drives module also to include controlling, with broad domain oxygen sensor, the broad domain oxygen sensor interface module that end is connected。
Described Sensor section also includes the exhaust temperature sensor for measuring engine exhaust temperature, and exhaust temperature sensor is installed on exhaust main or exhaustor, and exhaust temperature sensor is connected with input signal processing module。
Described executor also includes oil and gas mode selection switch and dual-fuel control system information display array terminal, and described output interface drives module also to include showing, with dual-fuel control system information, Message Display Terminal's interface module that array terminal is connected with oil and gas mode selection switch；
Oil and gas mode selection switch and dual-fuel control system information display array terminal are provided with dual fuel mode selection switch, described Sensor section also includes the oil and gas double fuel mode of operation switching switch selecting switching function identical with dual fuel mode, and oil and gas double fuel mode of operation switching switch is connected with input signal processing module。
Described Sensor section also includes the system power supply supply voltage sensor being arranged in accumulator, and it is arranged on the common rail pressure sensor on high-pressure common-rail pipe, wherein system power supply supply voltage sensor is connected with input signal processing module, and common rail pressure sensor is connected with fuel ECU；
Described executor also includes controlling valve and EGR control valve with the fuel ECU supercharger being connected。
A kind of control method of the oil gas dual-fuel electromotor of automatically controlled fuel feeding, first whether detecting and controlling system is working properly, when controlling system worked well, which kind of mode of operation detection electromotor is in, i.e. pure fuel oil service pattern or oil and gas double fuel mode of operation, under oil and gas double fuel mode of operation, first whether detection system meets the service condition of oil and gas double fuel mode of operation, satisfied then maintain oil and gas double fuel mode of operation, it is unsatisfactory for, is converted to pure fuel oil service pattern, often carry out re-starting after taking turns pure fuel oil service pattern or oil and gas double fuel mode of operation the detection of control system and mode of operation, until engine stop work；
Under pure fuel oil service pattern: double fuel ECU produces the signal identical with the fuel injector control signal of fuel oil ECU, driving fuel injector oil spout and implement the control of fuel injection amount, combustion gas controls nozzle and stops injection combustion gas；
Under oil and gas double fuel mode of operation: double fuel ECU is according to detected distributive value, according to fuel oil substitution rate MAP (arteries and veins spectrogram), calculating obtains gas quantity and pilot fuel amount, and control nozzle characteristic MAP, fuel oil injection timing MAP and fuel gas injection timing MAP, engine parameter correction MAP and combustion gas parameters revision MAP according to injector characteristics MAP and combustion gas, produce and export fuel injector and combustion gas controls nozzle and drives signal, implement fuel injector and combustion gas are controlled the control of nozzle。
Under oil and gas double fuel mode of operation: adopt electronic air throttle body to control air input of engine by air, double fuel ECU calculates required air quantity under corresponding operating mode according to the fuel quantity of supplied electromotor with the air-fuel ratio MAP of setting, regulates its throttle opening by electronic air throttle body and realizes the control to target air volume；The measuring method of air capacity adopts intake flow sensor directly to measure, or is obtained in conjunction with the air inflow model calculating of electromotor by air-distributor pressure temperature sensor；
Under oil and gas double fuel mode of operation: adopt broad domain oxygen sensor to measure and control electromotor work air-fuel ratio, the method controlling to adopt opened loop control to combine with closed loop control of engine air-fuel ratio, the difference closed loop of the actual mixing ratio measured by broad domain oxygen sensor and target air-fuel ratio regulates amount of fuel and gas quantity, makes actual measurement air-fuel ratio consistent with target air-fuel ratio；
Under oil and gas double fuel mode of operation: adopt exhaust temperature sensor to measure engine exhaust temperature, when electromotor row's temperature exceedes setting value, control combustion gas control nozzle and fuel gas injection amount is limited or is switched to pure fuel oil service pattern, thus the thermic load limited in cylinder。
Specifically include following steps:
1) detect each sensor signal of engine control system, it may be judged whether there is fault, otherwise enter step 2), be then enter step 9)；
2) switch or the state of oil and gas double fuel mode of operation switching switch are selected according to dual fuel mode, judge the duty of electromotor, if selecting pure fuel oil service pattern, enter step 9), if selecting oil and gas double fuel mode of operation, judge whether to meet the condition of oil and gas double fuel mode of operation, if meeting, enter step 3), otherwise enter step 9)；
3) electromotor enters oil and gas double fuel mode of operation, according to the fuel oil injection pulse width that the signal from the fuel injector drive output of fuel oil ECU records, total diesel oil demand is calculated with the rail pressure recorded by common rail pressure sensor, rotating speed according to electromotor and load calibration gaseous fuel substitution rate MAP, obtain the substitution rate r under current working, calculate pilot fuel amount Q according to substitution rate respectivelydieselWith gaseous fuel quantity Qgas, enter step 4 afterwards)；
4) checking whether installation electronic air throttle body, if not installing, entering step 6), if installing, according to the pilot fuel amount Q being computeddieselWith gaseous fuel quantity Qgas, calculate the target inlet air air capacity of electromotor under corresponding operating mode according to the target air-fuel ratio MAP demarcated, enter step 5 afterwards)；
5) check whether and be installed into mass-air-flow sensor, if installing, regulate the throttle opening of electronic air throttle body according to the air mass flow closed loop feedback of intake flow sensor actual measurement, make actual measurement air mass flow consistent with calculating target air flow, subsequently into step 6)；If not installing, check whether installation air-distributor pressure temperature sensor, if not installing, enter step 6), if installing, calculate target inlet air manifold pressure according to the air inlet Inflated model of electromotor and target air flow, and closed loop feedback control throttle opening is consistent with target inlet air manifold pressure to actual measurement suction press, enters step 6 afterwards)；
6) according to the target air-fuel ratio set or demarcate, carry out the closed loop feedback correction of pilot fuel amount and gaseous fuel quantity, by adjusting pilot fuel amount and gaseous fuel quantity, make the actual mixing ratio that electromotor works consistent with target air-fuel ratio, and obtain final pilot fuel amount and gaseous fuel quantity, then carry out step 7)；
7) signal according to exhaust temperature sensor; whether the row's of inspection temperature exceedes setting value or calibration value; if not less than, enter step 8); if exceeding, undertaken arranging temperature protection control by reducing fuel oil substitution rate r, reduce total fuel injection quantity or being switched to pure fuel oil service pattern, subsequently into step 8)；
8) control the characteristic MAP of nozzle according to the characteristic of fuel delivery MAP of high-pressure oil pump and combustion gas, final pilot fuel amount and gaseous fuel quantity are converted to respectively fuel injector and controls pulsewidth and gaseous fuel injection pulse width, enter step 10)；
9) the pure fuel oil service pattern of electromotor entrance, is now produced to control fuel injector with the fuel oil ECU identical signal of the fuel injector control signal produced by double fuel ECU and carries out oil spout, and stop combustion gas control nozzle operation, then carry out step 10)；
10) carry out information to show, dual fuel mode is selected the information of switch to issue double fuel ECU by the mode adopting two-way communication, the data message needing display is issued oil and gas mode selection switch and dual-fuel control system information display array terminal by double fuel ECU simultaneously, then whole control process returns to step 1) repeat to proceed by, till engine stop works。
Compared with prior art, beneficial effects of the present invention is as follows:
The control system of the oil gas dual-fuel electromotor of automatically controlled fuel feeding provided by the invention, the basis of pure fuel control system adds the gas injection system for spraying combustion gas, and for controlling the oil/gas double fuel electric-control system of oil-gas jetting, it is possible to the oil-gas jetting for the oil and gas dual fuel engine under electronically controlled unit pump, electrically-controlled pump nozzle and Common-rail technology controls。Wherein oil/gas double fuel electric-control system includes Sensor section, executor and gathers the signal of Sensor section and control the double fuel ECU and fuel oil ECU of executor's running。Double fuel ECU selects the working condition of switch and electromotor to judge that electromotor is operated in pure fuel oil pattern or dual fuel mode by oil and gas。The control signal identical with fuel oil ECU is produced by double fuel ECU under pure fuel oil pattern, fuel injector oil spout is directly driven by double fuel ECU, without using relay switching to make fuel injector be controlled fuel injector by fuel oil ECU under pure fuel oil pattern and be controlled to drive fuel injector by double fuel ECU under dual fuel mode, thus eliminating multiple relay, simplify control system, add the reliability of control system work。Under oil and gas dual fuel mode, oil gas dual-fuel controls Sensor section and executor with double fuel ECU to be completed to control jointly, wherein Sensor section includes the multiple sensors for monitoring each running status of electromotor, the signal of these sensor acquisition forms instruction after double fuel ECU processes, and completed instruction by executor, executor feeds back information to double fuel ECU in the course of the work, carries out the adjustment of instruction, reaches to control purpose。Double fuel ECU is by gathering the signal of each sensor of electromotor, judge the duty of electromotor, and the operating condition parameter of the electromotor according to Real-time Collection, according to the electromotor fuel injection parameters under each duty set and fuel gas injection parameter, the control signal of fuel oil Yu combustion gas is transmitted separately to executor, is finally controlled oil spout by fuel injector, fuel control Jet control jet, thus replacing part fuel oil with combustion gas, the synchronization completing oil gas utilizes。The control system of the oil gas dual-fuel electromotor of automatically controlled fuel feeding provided by the invention can improve electric-controlled co-rail, the control system Problems existing of the oil gas of the diesel oil of electronically controlled unit pump or electrically-controlled pump nozzle fuel feeding/combustion gas dual fuel engine, fuel injection amount can be accurately controlled according to the duty that electromotor is different, time for spraying and the injection duration of gaseous fuel can be controlled simultaneously, intake air amount, current main flow diesel oil electric-control system can be merged more easily, thus ensureing that dual fuel engine safety and steady runs, lower fuel consumption, reduce exhaust emissions, dual fuel engine is made to control system more accurate, electromotor runs more safe and reliable, energy-conservation, economical, environmental protection。
Further, the control system of the oil gas dual-fuel electromotor of automatically controlled fuel feeding provided by the invention adds this intake-air quantity control apparatus of electronic throttle, by in sub-load to air inlet restriction to reduce the air inflow of electromotor, the concentration of gaseous mixture in cylinder can be increased when keeping the fuel quantity of former engine operating condition, the mixture strength in engine cylinder is made to control within the lean flammability limit of fuel, so can reduce the utilization rate catching fire and improving fuel, thus improving the fuel economy of electromotor, the substitution rate improving diesel oil improves the fuel economy of electromotor, improve the efficiency of combustion of fuel, reduce unburned hydrocarbon (HC) discharge, improve the delivery temperature of electromotor simultaneously, be conducive to using tail-gas after treatment apparatus to reduce harmful tailpipe emissions further。
Further, the control system of the oil gas dual-fuel electromotor of automatically controlled fuel feeding provided by the invention, exhaustor is installed the oxygen sensor of wide area, the air fuel ratio (air-fuel ratio) of electromotor work is detected, and the closed loop feedback realizing target setting air-fuel ratio controls, to improve the precision of system air-fuel ration control, thus being largely overcoming the precision problem that Pilot diesel flow rate controls, improve stability and the reliability of system work。
Further; the control system of the oil gas dual-fuel electromotor of automatically controlled fuel feeding provided by the invention; add exhaust gas temperature sensor; by detecting electromotor row's temperature, the thermic load of dual fuel engine is monitored; when thermic load exceeds standard by reducing engine gas amount, reduction engine power exports or is switched to pure fuel oil pattern and protects electromotor; make its safe operation, it is to avoid thermic load is high and damages electromotor。
The control method of the oil gas dual-fuel electromotor of automatically controlled fuel feeding provided by the invention, can well control electromotor under pure fuel oil service pattern and oil and gas double fuel mode of operation and carry out normal operation, and the switching of pattern can be operated in time, under oil and gas double fuel mode of operation: double fuel ECU is according to detected distributive value, according to fuel oil substitution rate MAP, calculating obtains gas quantity and pilot fuel amount, and control nozzle characteristic MAP according to injector characteristics MAP and combustion gas, fuel oil injection timing MAP and fuel gas injection timing MAP, engine parameter correction MAP and combustion gas parameters revision MAP, produce and export fuel injector and combustion gas controls nozzle and drives signal, implement fuel injector and combustion gas are controlled the control of nozzle。The control method of the oil gas dual-fuel electromotor of automatically controlled fuel feeding provided by the invention can improve electric-controlled co-rail, the control method Problems existing of the oil gas of the diesel oil of electronically controlled unit pump or electrically-controlled pump nozzle fuel feeding/combustion gas dual fuel engine, fuel injection amount can be accurately controlled according to the duty that electromotor is different, time for spraying and the injection duration of gaseous fuel can be controlled simultaneously, intake air amount, current main flow diesel oil electric-control system can be merged more easily, thus ensureing that dual fuel engine safety and steady runs, lower fuel consumption, reduce exhaust emissions, dual fuel engine is made to control system more accurate, electromotor runs more safe and reliable, energy-conservation, economical, environmental protection。
Further, the control method of the oil gas dual-fuel electromotor of automatically controlled fuel feeding provided by the invention, the throttle opening using electronic throttle controls engine charge air capacity, the substitution rate improving diesel oil improves the fuel economy of electromotor, improve the efficiency of combustion of fuel, reduce unburned hydrocarbon (HC) discharge, improve the delivery temperature of electromotor simultaneously；Use broad domain oxygen sensor dual fuel engine air-fuel ratio is detected and carries out air-fuel ratio closed loop feedback control, it is possible to overcome the precision problem that the Pilot diesel flow rate of mechanical pump controls, improve stability and the reliability of system work；Using exhaust gas temperature sensor that electromotor is arranged temperature to detect, limiting the thermic load of electromotor work, thus protecting electromotor so that it is safe operation。
Accompanying drawing explanation
Fig. 1 is the structural representation of engine control system provided by the invention；
Fig. 2 is the structural schematic block diagram of engine control system provided by the invention；
Fig. 3 is the flow chart of engine control provided by the invention；
Wherein: 10 is Sensor section, 11 is exhaust-driven turbo-charger exhaust-gas turbo charger, 12 is ERG, 13 is common rail pressure sensor, 14 is cooling-water temperature sensor, 15 is air-distributor pressure temperature sensor, 17 is CMPS Camshaft Position Sensor, 18 is crankshaft position sensor, 19 is accelerator pedal position sensor, 21 is system power supply supply voltage sensor, 22 is combustion gas liquid level or pressure transducer, 23 is oil and gas double fuel mode of operation switching switch, 24 is gaseous-pressure and temperature sensor, 25 is TPS, 26 is broad domain oxygen sensor, 27 is exhaust temperature sensor, 28 is gas storage tank, 29 is fuel injector drive output, 30 is fuel oil ECU, 31 is fuel injector fictitious load, 32 is input signal processing module, 33 is microprocessor, 34 drive module for fuel injector, 35 is combustion gas ECU, 36 control nozzle for combustion gas drives module, 37 is broad domain oxygen sensor interface module, 38 drive module for electronic throttle, 39 is Message Display Terminal's interface module, 40 is executor, 42 control valve for supercharger, 43 is EGR control valve, 44 is hydraulic oil pump control valve, 45 is fuel injector, 46 control nozzle for combustion gas, 47 control end for broad domain oxygen sensor, 48 is electronic air throttle body, 49 is oil and gas mode selection switch and dual-fuel control system information display array terminal, 50 is gas pressure regulation valve, 54 is inlet manifold, 55 is engine body, 56 is connecting line, 57 is exhaust main, 58 is fuel tank, 59 is intake flow sensor, 60 is high-pressure oil pump, 61 is filter, 62 is exhaust manifold, 63 is exhaustor, 64 is high-pressure common-rail pipe, 65 is gas distribution pipe, 66 is wire harness, 67 is gas pedal, 68 is inlet manifold, 69 is inlet manifold, 70 be exhaust silencer and or preprocessor, 71 is accumulator, 72 is high-pressure oil pipe, 73 is burnt gas switch main valve。
Detailed description of the invention
For making the purpose of the present invention, technical scheme and advantage clearly understand, below in conjunction with accompanying drawing, the present invention is described in further detail。
Seeing figures.1.and.2, the control system of the oil gas dual-fuel electromotor of automatically controlled fuel feeding provided by the invention includes engine body 55, exhaust-driven turbo-charger exhaust-gas turbo charger 11, ERG 12, implements bavin fuel-flow control and the high-pressure common-rail injection system of high-pressure injection, gas injection system and oil/gas double fuel electric-control system。
Described high-pressure common-rail injection system includes high-pressure oil pump 60, filter 61, high-pressure common-rail pipe 64, fuel injector (nozzle) 45 and connecting line, the fuel oil being arranged in fuel tank 58 arrives high-pressure oil pump 60 through filter 61, it is assigned to each fuel injector 45 after arriving high-pressure common-rail pipe 64 after pressurization, fuel injector implements metering and injection。
Described gas injection system includes the combustion gas of electromagnetic type and controls combustion gas liquid level or pressure transducer 22, the gas pressure regulation valve 50 in nozzle 46, the burnt gas switch main valve 73 of electric-controlled type, gas storage tank 28 and be installed on the gaseous-pressure on gas distribution pipe 65 or in connecting line 56 and temperature sensor 24。Combustion gas in liquid form or gaseous form be stored in gas storage tank 28, the gas storage tank of storing liquid fuel is with the evaporator that liquid combustion gas carries out heat absorption evaporation gasification, fuel gas arrives burnt gas switch main valve 73 place after leaving vaporizer, can burnt gas switch main valve 73 be to control fuel arrive the main valve of electromotor, and burnt gas switch main valve 73 is controlled by double fuel ECU35。Gaseous fuel (combustion gas) arrives gas pressure regulation valve 50 through burnt gas switch main valve 73, fuel pressure is down to conventional expulsion pressure scope (3～8Bar), then arrive combustion gas through gas distribution pipe 65 and control nozzle 46, combustion gas control nozzle 46 and be injected into the air inlet pipe of electromotor。Described combustion gas control nozzle is installed on the inlet manifold 69 before the electronic air throttle body of electromotor or on the inlet manifold 54 after electronic air throttle body with form one group multiple, is called single point injection；Or when combustion gas control nozzle is installed in the inlet manifold 68 of electromotor with single form, it is called multi-point injection；Combustion gas controls nozzle 46 and is controlled by double fuel ECU35, and combustion gas controls the jet amount of nozzle by gaseous-pressure and the pulsewidth decision controlling pulse。
Described oil/gas double fuel electric-control system includes Sensor section 10, executor 40, fuel oil ECU30 and combustion gas ECU35 composition。Described Sensor section 10 includes the cooling-water temperature sensor 11 being positioned on engine body 55 being simultaneously coupled to fuel oil ECU30 and double fuel ECU35, air-distributor pressure temperature sensor 15 on inlet manifold 54 or be positioned at the intake flow sensor 59 before exhaust-driven turbo-charger exhaust-gas turbo charger 11, crankshaft position sensor 18, CMPS Camshaft Position Sensor 17, accelerator pedal position sensor 19, common rail pressure sensor 13, described Sensor section 10 also includes the gaseous-pressure and the temperature sensor 24 that are attached only to double fuel ECU35, combustion gas liquid level or pressure transducer 22, exhaust temperature sensor 27, broad domain oxygen sensor 26, TPS 25, oil and gas double fuel mode of operation switching switch 23。
The fuel injector drive output 29 of described fuel oil ECU30 is simultaneously connected to input signal processing module 32 and the fuel injector fictitious load (circuit of simulation diesel fuel nozzle load characteristic) 31 of double fuel ECU35, so that the signal pulsewidth of the fuel injector drive output 29 of fuel oil ECU can be detected by double fuel ECU, to determine by the determined diesel oil amount of fuel oil ECU, described fuel injector fictitious load 31 is positioned at inside double fuel ECU or becomes independent module and is placed on the outside of double fuel ECU。
The difference of the measuring method according to engine intake airflow, according to air-distributor pressure temperature sensor 15 in described Sensor section 10, then speed densimetry calculates, according to the Inflated model of electromotor, the aeration quantity obtaining each cylinder of electromotor, and the Inflated model of electromotor is discussed in detail below；According to the intake flow sensor 59 being positioned at before exhaust-driven turbo-charger exhaust-gas turbo charger 11, then directly measuring engine intake airflow and calculate each cylinder aeration quantity, two kinds of methods use one of them。
Described double fuel ECU includes the input signal processing module 32, microprocessor 33 and the output interface drive circuit that are connected with each sensor, the signal of each sensor processes through input signal processing module 32 and is changed into the receptible digital quantity of microprocessor 33, microprocessor passes through corresponding output interface drive circuit through computing, judgement process and the output produced, and makes executor 40 work。
The internal structure of described fuel oil ECU is essentially identical with double fuel ECU's。
Described executor 40 includes being connected to the supercharger of fuel oil ECU and controls valve 42, EGR control valve 43, hydraulic oil pump control valve 44, described executor also includes the fuel injector 45 driving module 34 to be connected with fuel injector in double fuel ECU, the combustion gas control nozzle 46 that nozzle drives module 36 to be connected is controlled with the combustion gas in double fuel ECU, the electronic air throttle body 48 controlling engine charge air capacity that module 38 is connected is driven with the electronic throttle of double fuel ECU, the broad domain oxygen sensor being connected with broad domain oxygen sensor interface module 37 controls end 47, the oil and gas mode selection switch being connected with the Message Display Terminal's interface module 39 in double fuel ECU and dual-fuel control system information display array terminal 49。Wherein fuel injector drives module can adopt with the special drive integrated circult such as L9781 circuit formed for core, electronic throttle drives module can adopt special drive integrated circult such as L9958, broad domain oxygen sensor interface module can adopt such as CJ125, and microprocessor can adopt MC9S12。Oil and gas mode selection switch adopts the mode of two-way communication to select the information of switch to issue double fuel ECU dual fuel mode with dual-fuel control system information display array terminal 49 with double fuel ECU, the data message needing display is issued oil and gas mode selection switch and dual-fuel control system information display array terminal 49 by double fuel ECU simultaneously, difference according to communication mode, its interface circuit is also different, it is possible to adopt communication mode such as K line mode, CAN mode and LIN bus mode etc. conventional on automobile to realize。The each parts of oil/gas double fuel electric-control system are connected by wire harness 66。
Described fuel oil ECU outfan is connected to fuel injector fictitious load, and fuel injector fictitious load two ends are simultaneously coupled to double fuel ECU and fuel oil ECU；Described double fuel ECU controls fuel gas injection amount, injection timing, also control electronic air throttle body and control intake air amount etc., described fuel oil ECU controls electromotor and controls diesel injection pressures, emitted dose and oil injection time, controls exhaust-driven turbo-charger exhaust-gas turbo charger, controls waste gas recirculation etc.；Described double fuel ECU selects the working condition of switch and electromotor to judge that electromotor is operated in fuel oil pattern or dual fuel mode by oil and gas, when electromotor is operated in pure fuel oil pattern, double fuel ECU according to be simultaneously coupled to fuel oil ECU outfan and double fuel ECU input the diesel injection signal that detects of fictitious load, produce signal equal with it and control fuel injector, control fuel oil control nozzle to quit work, during double fuel mode of operation, double fuel ECU is according to the total diesel injection amount of the diesel injection pulsewidth detected from fictitious load and diesel common rail calculation of pressure, total oil mass is converted into gas quantity and Pilot diesel quantity by the substitution rate according to setting, control fuel injector work simultaneously and combustion gas controls nozzle operation, electromotor is made to be operated under dual fuel mode；During dual fuel mode, charge flow rate is controlled by double fuel ECU also by electronic air throttle body, and utilizes the air-fuel ratio that electromotor is run by broad domain oxygen sensor to carry out closed loop control, thus ensureing that dual fuel engine safety and steady runs, lower fuel consumption, reduce exhaust emissions。
Generally intake pipe absolute pressure sensor and intake air temperature sensor are become one, become air-distributor pressure temperature sensor 15, but the separated function nor affecting on sensor and system。
Generally gaseous-pressure sensor and fuel gas temperature sensor integration are integrated, become gaseous-pressure and temperature sensor 24, but the separated function nor affecting on sensor and system。
The control method of the oil gas dual-fuel electromotor of automatically controlled fuel feeding provided by the invention, fuel oil ECU controls the other system of the electromotor except gas injection system, such as exhaust-driven turbo-charger exhaust-gas turbo charger 11, ERG 12, high-pressure oil pump 44 etc.。The fuel injector drive output of fuel oil ECU is connected to input signal processing module and the fuel injector fictitious load of double fuel ECU, double fuel ECU determines diesel oil distributive value by the pulsewidth and high-pressure diesel common rail pressure detecting the fuel injector drive output output signal of fuel oil ECU, and the state according to oil and gas double fuel mode of operation switching switch, water temperature in conjunction with detection electromotor, whether detection engine electric-controlled system exists fault, pure diesel fuel mode (single fuel mode) or diesel oil/combustion gas dual fuel mode whether it is operated in etc. conditional judgment electromotor, when being operated in single fuel mode, double fuel ECU produces the signal identical with its detected fuel oil ECU fuel injector drive output 29 signal, drive the fuel injector 45 being attached thereto, when being operated in diesel oil/combustion gas dual fuel mode, double fuel ECU is according to detected diesel oil distributive value, according to diesel oil substitution rate arteries and veins spectrogram (MAP) being stored in, calculating obtains gas quantity and Pilot diesel quantity, and the relevant MAP according to diesel fuel nozzle characteristic and gas nozzle characteristic, diesel injection timing MAP and fuel gas injection timing MAP, engine parameter correction MAP and combustion gas parameters revision MAP etc., produce and export fuel injector and combustion gas controls nozzle and drives signal to control nozzle to the fuel injector being attached thereto and combustion gas, implement fuel injector and combustion gas are controlled the control of nozzle。
Described double fuel ECU controls air input of engine by air also by the electronic air throttle body 48 being installed on engine intake manifold, double fuel ECU calculates required air quantity under corresponding operating mode according to the fuel quantity of supplied electromotor with the air-fuel ratio MAP of setting, regulates its throttle opening by electronic air throttle body and realizes the control to target air volume。The measuring method of air capacity can directly be measured by intake flow sensor 59, or by being installed on the air-distributor pressure temperature sensor 15 on electronic air throttle body downstream inlet house steward 54, the air inflow model of electromotor calculate and obtain。
Described control method also includes adopting the broad domain oxygen sensor 26 being installed on exhaust main 57 or exhaustor 63 to measure and controlling electromotor work air-fuel ratio, the method controlling to adopt opened loop control to combine with closed loop control of engine air-fuel ratio。First the control of engine air-fuel ratio be built upon on the basis of opened loop control, described opened loop control process is: double fuel ECU is according to the fuel ECU determined electromotor oil spout total amount in different operating modes, and based on this, according to default target diesel oil substitution rate MAP, the working status parameter of electromotor and duty parameter calculate Pilot diesel quantity and gaseous fuel quantity, according to the diesel pressure that obtained Pilot diesel flow rate detects in conjunction with common rail pressure sensor 13, the property calculation Pilot diesel flow rate of fuel injector controls pulsewidth, and controlled, by double fuel ECU, the Pilot diesel flow rate that fuel injector injection is corresponding, combustion gas controls nozzle be controlled making it spray the gas quantity of correspondence, according to calculating obtained diesel oil amount and gas quantity, according to the target air-fuel ratio MAP set, calculate intake air amount, controlling electronic air throttle body makes the intake air amount of electromotor consistent with calculating air capacity。
The actual mixing ratio and the target air-fuel ratio that there is error yet with actual diesel oil amount and gas quantity and calculating diesel oil amount and gas quantity, calculate air capacity with amount of actual air for combustion and exist the existence of many-sided errors such as error electromotor work there are differences, in order to reduce this species diversity, the difference closed loop needing the actual mixing ratio measured by broad domain oxygen sensor and target air-fuel ratio regulates diesel oil amount and gas quantity, makes actual measurement air-fuel ratio consistent with target air-fuel ratio。The method adoption rate of usual closed loop control-Integrated Derivative (PID) method carries out。
Described control method also includes adopting the exhaust temperature sensor 27 measuring engine exhaust temperature being installed on exhaust main 57 or exhaustor 63 to measure engine exhaust temperature; when electromotor row's temperature exceedes setting value; the fuel gas injection amount of electromotor is limited to reduce the power output of electromotor; thus reducing row's temperature; or it is switched to pure diesel fuel mode to reduce row's temperature; reducing the thermic load just row of the reducing temperature in cylinder, thus protecting electromotor, making guarantee engine health run reliably。
The concrete steps of control method are described in detail below in conjunction with Fig. 3:
Step 101: gather the signal of each sensor of electromotor, including water temperature sensor signal, combustion gas liquid level or pressure sensor signal, combustion gas liquid level or pressure sensor signal, accelerator pedal position sensor signal, system power supply supply voltage sensor signal, CRANK SENSOR, CMPS Camshaft Position Sensor signal, oil and gas double fuel mode of operation switching switching signal state, air-distributor pressure temperature sensor signal, intake flow sensor signal, broad domain oxygen sensor signal, throttle position sensor signal, the above-mentioned signal collected is delivered to the input signal processing module 32 of double fuel ECU, convert the data that the microprocessor 33 of double fuel ECU can recognise that to, carry out next step 102。
Step 102: after the data collected are carried out algorithm process, the ardware feature for various sensors and executor carries out technical Analysis process, it is judged that controls system and electromotor whether fault, is then be directly entered the pure diesel oil mode of operation of step 117；Otherwise then enter next step 103。
Step 103: select the signal condition of switch according to dual fuel mode, it is determined that the duty of electromotor, if selecting dual fuel mode, then entering step 104, otherwise entering step 117。
Step 104: judge whether to meet the switching condition of double fuel mode of operation, if meeting, enters step 105, otherwise enters step 117。Meet switching condition to be mainly: the water temperature of (1) Diesel engine is in OK range, more than setting low temperature (such as 60 DEG C) simultaneously less than the overtemperature (such as 93 DEG C) set, (2) engine speed satisfies condition, as more than 1000r/min, (3) amount of storage of the combustion gas of combustion gas liquid level or pressure sensor signal display gas storage tank meets electromotor and enters dual fuel mode operation, (4) supply voltage (voltage of accumulator) meets normal running (operation) conditions, battery is power shortage not, etc.。
Step 105: electromotor enters double fuel state and controls, now according to the diesel injection pulsewidth determined by fuel oil ECU recorded from the signal of the fuel injector drive output of fuel oil ECU, the total diesel oil demand determined by fuel oil ECU is calculated with the rail pressure recorded by common rail pressure sensor, electronic controlled diesel mostly is multi-injection, the computational methods of total diesel oil amount are the summation of each injection oil mass, and the computing formula of each distributive value Q is Q=k × TW×Pw, wherein TWPulsewidth is penetrated, P by being surveyedwBy being surveyed common rail pressure, k is injector characteristics constant。Rotating speed and load (duty parameter) according to electromotor look into the gaseous fuel substitution rate MAP demarcating (or setting) in advance, obtain the substitution rate r under current working, according to substitution rate formula Qdiesel=(1-r) × Q and Qgas=r × Q, calculates Pilot diesel quantity Q respectivelydieselWith gaseous fuel quantity Qgas, enter afterwards next step 106。
Step 106: check whether installation electronic air throttle body, if then entering step 107, otherwise entering step 111 and not carrying out electronic air throttle body control。
Step 107: according to the Pilot diesel quantity Q being computeddieselWith gaseous fuel quantity Qgas, calculate the target inlet air air capacity of electromotor under corresponding operating mode according to the target air-fuel ratio MAP demarcated。Enter step 108。
Step 108: check whether and be installed into mass-air-flow sensor, if then entering step 109, otherwise enters step 110。
Step 109: regulate the throttle opening of electronic air throttle body according to the air mass flow closed loop feedback of intake flow sensor actual measurement, make actual measurement air mass flow consistent with target air flow。Enter step 113。
Step 110: if being fitted without intake flow sensor, then check whether installation air-distributor pressure temperature sensor, if then entering step 112, otherwise entering step 111 and not carrying out electronic air throttle body control。
Step 111: control if not carrying out electronic air throttle body throttling, then enter step 113。
Step 112: calculate target inlet air manifold pressure according to the air inlet Inflated model of electromotor and target air flow, and closed loop feedback controls throttle opening, and extremely actual measurement suction press is consistent with target inlet air manifold pressure。Enter step 113。
The computing formula of common engine target Inflated model is to derive according to The Ideal-Gas Equation and obtain。When adopting air-distributor pressure temperature sensor。An induction stroke of electromotor is filled the air quality G of cylindera, available following formula calculates: Ga=ρ Vcηv
In formula: the atmospheric density (kg/m in ρ air inlet pipe3)；
VcVolume of cylinder (m3)；
ηvElectromotor charging efficiency。
Perfect gas equation ρ=P*M/ (R*T) is substituted into above formula obtain:
C=V in formulac/ R, for concrete type, is constant；
M is air molecule amount (kg/mol)；
R gas constant, R=8.314J/mol*k；
P air inlet pipe air pressure (kPa)；
T intake manifold air temperature (K)
As can be seen here, as long as after charging efficiency determines, double fuel ECU can according to cylinder intake quality Ga, intake air temperature T calculate MAP P。
Step 113: according to the target air-fuel ratio setting (demarcation), carry out the closed loop feedback correction of diesel oil amount and gaseous fuel quantity, by adjusting diesel oil amount and gaseous fuel quantity, make the actual mixing ratio that electromotor works consistent with target air-fuel ratio, and obtain final diesel oil amount and gaseous fuel quantity。Carry out step 114。
Step 114: according to exhaust temperature sensor signal, whether the row's of inspection temperature exceedes setting value (calibration value), if exceeding, enters step 116, otherwise enters step 115。
Step 115: control the characteristic MAP of nozzle according to injector characteristics MAP and combustion gas, converts final Pilot diesel quantity and gaseous fuel quantity fuel injector respectively to and controls pulsewidth and gaseous fuel injection pulse width。Enter step 118。
Step 116: row's temperature protection controls。The delivery temperature when purpose of row's temperature protection is to reduce electromotor work; after detection row's temperature; control by reducing diesel oil substitution rate r, reduce total fuel injection quantity or being switched to the realization row's temperature protection of pure diesel fuel mode; system can select to use one of them or the multiple mode arranging temperature protection according to the situation that row's temperature exceeds standard; the row's temperature starting to arrange temperature protection is different with the heatproof situation difference of electromotor; it is required for electromotor by testing decision, for instance carry out arranging temperature protection more than 580 DEG C of needs in heavy truck the Studying about Turbocharger of Engine device 1 heel row temperature。Carry out step 115。
Step 117: if prior process judges that electromotor should be operated in single fuel mode of pure diesel oil, is now produced to control fuel injector with the fuel oil ECU identical signal of the fuel injector control signal produced by double fuel ECU and carries out oil spout, stop gas injection system work。Enter step 118。
Step 118: the information of carrying out shows。Dual fuel mode is selected the information of switch to issue double fuel ECU by the mode adopting two-way communication, the data message needing display is issued oil and gas mode selection switch and dual-fuel control system information display array terminal by double fuel ECU simultaneously, then whole control process returns to step 101 and repeats to proceed by, till engine stop works。
Described Sensor section 10 also includes the oil and gas double fuel mode of operation switching switch being separately provided, its effect selects switch identical with oil and gas mode selection switch with the dual fuel mode in dual-fuel control system information display array terminal, the two switch is parallel to be arranged, when any one switch therein is arranged to double fuel working method, system thinks that user exists the request of double fuel working method, and system is prepared to enter into double fuel mode and works。Described the two switch only retains one, and the system that nor affects on loses the function of double fuel working method request。
It should be noted that, the present invention controls device and can apply to the electromotor of electronically controlled unit pump, electrically-controlled pump nozzle and high-pressure common rail structure, it is possible to the gaseous fuel type of addition includes CNG (compressed natural gas fuel), LNG (Liquefied Natural Gas fuel), LPG (liquefied petroleum gas) etc.。
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit protection scope of the present invention, equivalent variations that any those of ordinary skill in the art are made or replacement, it is regarded as being encompassed within protection scope of the present invention。
Claims (10)
1. the control system of the oil gas dual-fuel electromotor of an automatically controlled fuel feeding, it is characterised in that: include high-pressure common-rail injection system, gas injection system and oil/gas double fuel electric-control system；
High-pressure common-rail injection system includes the fuel tank (58), filter (61), high-pressure oil pump (60) and the high-pressure common-rail pipe (64) that are sequentially connected；
The combustion gas that gas injection system includes being arranged on connecting line (56) controls nozzle (46), burnt gas switch main valve (73), gas pressure regulation valve (50) and gas distribution pipe (65)；
Oil/gas double fuel electric-control system includes Sensor section (10), executor (40) and gathers the signal of Sensor section (10) and control double fuel ECU (35) and the fuel oil ECU (30) that executor (40) operates；
Wherein double fuel ECU (35) includes driving for the output interface that the input signal processing module (32) receiving the signal that Sensor section (10) gathers is connected module and the microprocessor (33) driving module to be connected with signal processing module (32) and output interface with executor (40), is additionally provided with fuel injector fictitious load (31) in double fuel ECU (35)；It is provided with fuel injector drive output (29) in fuel oil ECU (30), and fuel injector drive output (29) is connected with input signal processing module (32) and fuel injector fictitious load (31)；
Executor (40) includes the hydraulic oil pump control valve (44) being connected with fuel ECU (30), and the fuel injector (45) being connected with double fuel ECU (35) and combustion gas control nozzle (46)；
Sensor section (10) includes the cooling-water temperature sensor (14) being positioned on engine body (55) being simultaneously connected with fuel oil ECU and double fuel ECU, be positioned at the air-distributor pressure temperature sensor (15) on inlet manifold (54) and or intake flow sensor (59), it is positioned at the crankshaft position sensor (18) of engine flywheel end, it is positioned at the CMPS Camshaft Position Sensor (17) at cam of injection pump axle or inlet and exhaust valve camshaft place and for detecting the accelerator pedal position sensor (19) of accelerator pedal position, and be connected with double fuel ECU control the gaseous-pressure of nozzle inlet place gaseous-pressure and temperature and temperature sensor (24) and the combustion gas liquid level being arranged in gas storage tank (28) or pressure transducer (22) for measuring combustion gas。
2. the control system of the oil gas dual-fuel electromotor of automatically controlled fuel feeding according to claim 1, it is characterised in that: described output interface drives module to include controlling combustion gas control nozzle driving module (36) that nozzle (46) is connected and fuel injector driving module (34) being connected with fuel injector (45) with combustion gas。
3. the control system of the oil gas dual-fuel electromotor of automatically controlled fuel feeding according to claim 2, it is characterized in that: described executor (40) also includes the electronic air throttle body (48) for engine charge air mass flow is controlled, described output interface drives the electronic throttle that module also includes being connected with electronic air throttle body (48) to drive module (38), described Sensor section (10) also includes the TPS (25) being positioned on electronic air throttle body (48), TPS (25) is connected with input signal processing module (32)。
4. the control system of the oil gas dual-fuel electromotor of the automatically controlled fuel feeding according to any one in claim 1-3, it is characterized in that: described Sensor section (10) also includes the broad domain oxygen sensor (26) for measuring electromotor work air-fuel ratio, and broad domain oxygen sensor (26) is installed on exhaust main (57) or exhaustor (63)；Described executor (40) also includes broad domain oxygen sensor and controls end (47)；Described output interface drives module also to include controlling, with broad domain oxygen sensor, the broad domain oxygen sensor interface module (37) that end (47) is connected。
5. the control system of the oil gas dual-fuel electromotor of the automatically controlled fuel feeding according to any one in claim 1-3, it is characterized in that: described Sensor section (10) also includes the exhaust temperature sensor (27) for measuring engine exhaust temperature, exhaust temperature sensor (27) is installed on exhaust main (57) or exhaustor (63), and exhaust temperature sensor (27) is connected with input signal processing module (32)。
6. the control system of the oil gas dual-fuel electromotor of the automatically controlled fuel feeding according to any one in claim 1-3, it is characterized in that: described executor (40) also includes oil and gas mode selection switch and dual-fuel control system information display array terminal (49), described output interface drives module also to include showing, with dual-fuel control system information, Message Display Terminal's interface module (39) that array terminal (49) is connected with oil and gas mode selection switch；
Oil and gas mode selection switch and dual-fuel control system information display array terminal (49) are provided with dual fuel mode selection switch, described Sensor section (10) also includes oil and gas double fuel mode of operation switching switch (23) selecting switching function identical with dual fuel mode, and oil and gas double fuel mode of operation switching switch (23) is connected with input signal processing module (32)。
7. the control system of the oil gas dual-fuel electromotor of the automatically controlled fuel feeding according to any one in claim 1-3, it is characterized in that: described Sensor section (10) also includes system power supply supply voltage sensor (21) being arranged in accumulator (71), and it is arranged on the common rail pressure sensor (13) on high-pressure common-rail pipe (64), wherein system power supply supply voltage sensor (21) is connected with input signal processing module (32), and common rail pressure sensor (13) is connected with fuel ECU (30)；
Described executor (40) also includes controlling valve (42) and EGR control valve (43) with fuel ECU (30) supercharger being connected。
8. the control method based on the oil gas dual-fuel electromotor of the automatically controlled fuel feeding of the control system of the oil gas dual-fuel electromotor of the automatically controlled fuel feeding described in any one in claim 1-7, it is characterized in that: first whether detecting and controlling system is working properly, when controlling system worked well, which kind of mode of operation detection electromotor is in, i.e. pure fuel oil service pattern or oil and gas double fuel mode of operation, under oil and gas double fuel mode of operation, first whether detection system meets the service condition of oil and gas double fuel mode of operation, satisfied then maintain oil and gas double fuel mode of operation, it is unsatisfactory for, is converted to pure fuel oil service pattern, often carry out re-starting after taking turns pure fuel oil service pattern or oil and gas double fuel mode of operation the detection of control system and mode of operation, until engine stop work；
Under pure fuel oil service pattern: double fuel ECU produces the signal identical with the fuel injector control signal of fuel oil ECU, driving fuel injector (45) oil spout and implement the control of fuel injection amount, combustion gas controls nozzle (46) and stops injection combustion gas；
Under oil and gas double fuel mode of operation: double fuel ECU is according to detected distributive value, according to fuel oil substitution rate MAP, calculating obtains gas quantity and pilot fuel amount, and control nozzle characteristic MAP, fuel oil injection timing MAP and fuel gas injection timing MAP, engine parameter correction MAP and combustion gas parameters revision MAP according to injector characteristics MAP and combustion gas, produce and export fuel injector and combustion gas controls nozzle and drives signal, implement fuel injector and combustion gas are controlled the control of nozzle。
9. the control method of the oil gas dual-fuel electromotor of automatically controlled fuel feeding according to claim 8, it is characterized in that: under oil and gas double fuel mode of operation: adopt electronic air throttle body (48) to control air input of engine by air, double fuel ECU calculates required air quantity under corresponding operating mode according to the fuel quantity of supplied electromotor with the air-fuel ratio MAP of setting, regulates its throttle opening by electronic air throttle body and realizes the control to target air volume；The measuring method of air capacity adopts intake flow sensor (59) directly to measure, or is obtained in conjunction with the air inflow model calculating of electromotor by air-distributor pressure temperature sensor (15)；
Under oil and gas double fuel mode of operation: adopt broad domain oxygen sensor (26) to measure and control electromotor work air-fuel ratio, the method controlling to adopt opened loop control to combine with closed loop control of engine air-fuel ratio, the difference closed loop of the actual mixing ratio measured by broad domain oxygen sensor and target air-fuel ratio regulates amount of fuel and gas quantity, makes actual measurement air-fuel ratio consistent with target air-fuel ratio；
Under oil and gas double fuel mode of operation: adopt exhaust temperature sensor (27) to measure engine exhaust temperature, when electromotor row's temperature exceedes setting value, control combustion gas control nozzle (46) and fuel gas injection amount is limited or is switched to pure fuel oil service pattern, thus the thermic load limited in cylinder。
10. the control method of the oil gas dual-fuel electromotor of automatically controlled fuel feeding according to claim 8 or claim 9, it is characterised in that specifically include following steps:
1) detect each sensor signal of engine control system, it may be judged whether there is fault, otherwise enter step 2), be then enter step 9)；
2) switch or the state of oil and gas double fuel mode of operation switching switch (23) are selected according to dual fuel mode, judge the duty of electromotor, if selecting pure fuel oil service pattern, enter step 9), if selecting oil and gas double fuel mode of operation, judge whether to meet the condition of oil and gas double fuel mode of operation, if meeting, enter step 3), otherwise enter step 9)；
3) electromotor enters oil and gas double fuel mode of operation, according to the fuel oil injection pulse width that the signal from the fuel injector drive output of fuel oil ECU records, total diesel oil demand is calculated with the rail pressure recorded by common rail pressure sensor, rotating speed according to electromotor and load calibration gaseous fuel substitution rate MAP, obtain the substitution rate r under current working, calculate pilot fuel amount Q according to substitution rate respectivelydieselWith gaseous fuel quantity Qgas, enter step 4 afterwards)；
4) checking whether installation electronic air throttle body (48), if not installing, entering step 6), if installing, according to the pilot fuel amount Q being computeddieselWith gaseous fuel quantity Qgas, calculate the target inlet air air capacity of electromotor under corresponding operating mode according to the target air-fuel ratio MAP demarcated, enter step 5 afterwards)；
5) check whether and be installed into mass-air-flow sensor (59), throttle opening if installing, according to air mass flow closed loop feedback adjustment electronic air throttle body (48) that intake flow sensor (59) is surveyed, make actual measurement air mass flow consistent with calculating target air flow, subsequently into step 6)；If not installing, check whether installation air-distributor pressure temperature sensor (15), if not installing, enter step 6), if installing, calculate target inlet air manifold pressure according to the air inlet Inflated model of electromotor and target air flow, and closed loop feedback control throttle opening is consistent with target inlet air manifold pressure to actual measurement suction press, enters step 6 afterwards)；
6) according to the target air-fuel ratio set or demarcate, carry out the closed loop feedback correction of pilot fuel amount and gaseous fuel quantity, by adjusting pilot fuel amount and gaseous fuel quantity, make the actual mixing ratio that electromotor works consistent with target air-fuel ratio, and obtain final pilot fuel amount and gaseous fuel quantity, then carry out step 7)；
7) signal according to exhaust temperature sensor (27); whether the row's of inspection temperature exceedes setting value or calibration value; if not less than, enter step 8); if exceeding, undertaken arranging temperature protection control by reducing fuel oil substitution rate r, reduce total fuel injection quantity or being switched to pure fuel oil service pattern, subsequently into step 8)；
8) the characteristic MAP of nozzle (46) is controlled according to the characteristic of fuel delivery MAP of high-pressure oil pump (44) and combustion gas, final pilot fuel amount and gaseous fuel quantity are converted to respectively fuel injector and controls pulsewidth and gaseous fuel injection pulse width, enter step 10)；
9) the pure fuel oil service pattern of electromotor entrance, is now produced to control fuel injector with the fuel oil ECU identical signal of the fuel injector control signal produced by double fuel ECU and carries out oil spout, and stop combustion gas control nozzle operation, then carry out step 10)；
10) carry out information to show, dual fuel mode is selected the information of switch to issue double fuel ECU by the mode adopting two-way communication, the data message needing display is issued oil and gas mode selection switch and dual-fuel control system information display array terminal (49) by double fuel ECU simultaneously, then whole control process returns to step 1) repeat to proceed by, till engine stop works。
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| Publication number | Priority date | Publication date | Assignee | Title |
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| RU2809886C1 (en) * | 2023-07-12 | 2023-12-19 | Федеральное государственное бюджетное образовательное учреждение высшего образования «Государственный университет морского и речного флота имени адмирала С.О. Макарова» | Electronically controlled gas diesel power system |
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Denomination of invention: Control system and control method of oil/gas dual-fuel engine in electronic control oil supply Effective date of registration: 20180927 Granted publication date: 20160622 Pledgee: Nanjing bank Limited by Share Ltd Lishui branch Pledgor: The Nan Jinggai power Science and Technology Ltd. of speeding Registration number: 2018320000203 |
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Effective date of registration: 20190909 Address after: 211200 Qinhuai Road, Lishui, Nanjing Yong Yang Street, No. Avenue, No. 288 Co-patentee after: Xi'an Jiaotong University Patentee after: The Nan Jinggai power Science and Technology Ltd. of speeding Address before: 211200, No. 688, Tianshengqiao Avenue, Yong Yang Town, Lishui District, Jiangsu, Nanjing Patentee before: The Nan Jinggai power Science and Technology Ltd. of speeding |
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Correction item: Patentee|Address|Patentee Correct: The Nan Jinggai power Science and Technology Ltd. of speeding|No. 688, Tianshengqiao Avenue, yongyang Town, piaoshui District, Nanjing, Jiangsu False: The Nan Jinggai power Science and Technology Ltd. of speeding|211200 Qinhuai Road, Lishui, Nanjing Yong Yang Street, No. Avenue, No. 288|Xi'an Jiaotong University Number: 39-02 Volume: 35 |
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Date of cancellation: 20200224 Granted publication date: 20160622 Pledgee: Nanjing bank Limited by Share Ltd Lishui branch Pledgor: The Nan Jinggai power Science and Technology Ltd. of speeding Registration number: 2018320000203 |