CN109184903B - The quasi-Homogeneous charge of multi-point injection is calmed the anger liquid electric control system of dual-fuel engine - Google Patents
The quasi-Homogeneous charge of multi-point injection is calmed the anger liquid electric control system of dual-fuel engine Download PDFInfo
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- CN109184903B CN109184903B CN201811282170.8A CN201811282170A CN109184903B CN 109184903 B CN109184903 B CN 109184903B CN 201811282170 A CN201811282170 A CN 201811282170A CN 109184903 B CN109184903 B CN 109184903B
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- 238000002347 injection Methods 0.000 title claims abstract description 106
- 239000007924 injection Substances 0.000 title claims abstract description 106
- 239000000446 fuel Substances 0.000 title claims abstract description 86
- 239000007788 liquid Substances 0.000 title claims abstract description 15
- 239000007789 gas Substances 0.000 claims abstract description 71
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 64
- 239000000295 fuel oil Substances 0.000 claims abstract description 34
- 239000003345 natural gas Substances 0.000 claims abstract description 32
- 239000003921 oil Substances 0.000 claims abstract description 26
- 239000000567 combustion gas Substances 0.000 claims abstract description 22
- 239000002283 diesel fuel Substances 0.000 claims abstract description 18
- 238000011217 control strategy Methods 0.000 claims abstract description 15
- 230000006835 compression Effects 0.000 claims abstract description 8
- 238000007906 compression Methods 0.000 claims abstract description 8
- 238000005507 spraying Methods 0.000 claims abstract description 7
- 239000007921 spray Substances 0.000 claims description 32
- 230000000087 stabilizing effect Effects 0.000 claims description 25
- 239000002737 fuel gas Substances 0.000 claims description 18
- 230000006870 function Effects 0.000 claims description 15
- 238000002309 gasification Methods 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 239000000498 cooling water Substances 0.000 claims description 6
- 239000002826 coolant Substances 0.000 claims description 4
- 238000002474 experimental method Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 239000006200 vaporizer Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 230000001133 acceleration Effects 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000011088 calibration curve Methods 0.000 claims description 3
- 230000004907 flux Effects 0.000 claims description 3
- 230000006698 induction Effects 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 239000003381 stabilizer Substances 0.000 claims description 2
- 230000009977 dual effect Effects 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 10
- 230000008450 motivation Effects 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 238000007726 management method Methods 0.000 description 3
- 230000000149 penetrating effect Effects 0.000 description 3
- 238000003915 air pollution Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000008246 gaseous mixture Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000012827 research and development Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000012356 Product development Methods 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
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- 238000012360 testing method Methods 0.000 description 1
- 238000012384 transportation and delivery Methods 0.000 description 1
- 238000013024 troubleshooting Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B69/00—Internal-combustion engines convertible into other combustion-engine type, not provided for in F02B11/00; Internal-combustion engines of different types characterised by constructions facilitating use of same main engine-parts in different types
- F02B69/02—Internal-combustion engines convertible into other combustion-engine type, not provided for in F02B11/00; Internal-combustion engines of different types characterised by constructions facilitating use of same main engine-parts in different types for different fuel types, other than engines indifferent to fuel consumed, e.g. convertible from light to heavy fuel
- F02B69/04—Internal-combustion engines convertible into other combustion-engine type, not provided for in F02B11/00; Internal-combustion engines of different types characterised by constructions facilitating use of same main engine-parts in different types for different fuel types, other than engines indifferent to fuel consumed, e.g. convertible from light to heavy fuel for gaseous and non-gaseous fuels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
- F02D19/08—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed simultaneously using pluralities of fuels
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0248—Injectors
-
- 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
- Y02T10/12—Improving ICE efficiencies
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The present invention proposes that the quasi-Homogeneous charge of multi-point injection is calmed the anger liquid electric control system of dual-fuel engine, including gas pressure-reducing channel, oil circuit, fuel injection device, cylinder and control unit；Gas pressure-reducing channel be connected with fuel injection device and to its export reduced pressure treatment after combustion gas；Oil circuit is connected with fuel injection device and exports fuel oil to it；When engine is in cylinder compression stroke, fuel oil is sprayed into cylinder with atomizer before piston reaches top dead centre by fuel injection device；When engine is in cylinder intake stroke, fuel injection device is filled with combustion gas in cylinder；Control unit includes ECU, valve control module and engine operating condition acquisition sensor；ECU is determined the time for spraying, fuel oil and the amount of injection of combustion gas of fuel oil and combustion gas according to engine operating condition by control strategy；The present invention can accurately control air inflow, fuel injection amount, natural gas supply amount on using natural gas-diesel oil dual fuel engine, and formulate relatively reasonable fueling strategy.
Description
Technical field
It calms the anger liquid dual fuel engine the present invention relates to the quasi-Homogeneous charge of technical field of engines, especially multi-point injection
Electric-control system.
Background technique
According to " Chinese automotive environment management annual report " data of national ecological environment portion publication in 2018, automobile pollution
The important sources for having become China's air pollution are the major reasons for causing environmental air pollution.Especially only account for car ownership
7.8% diesel vehicle has discharged 57.3% NOx and 77.8% PM, is the most important thing of Motor Vehicle Pollution Prevention.Research and development
And applying natural gas-Diesel Dual-Fuel Engine is considered as one of the effective way for solving diesel energy conservation and emissions reduction.Support into
The HCCI Natural Gas & Diesel Dual Fuel Engine engine electric-controlled system of gas manifold multi-point injection can accurately control air inflow, fuel oil spray
The amount of penetrating, natural gas supply amount, formulating relatively reasonable fueling strategy is the important skill for carrying out alternative fuels for diesel engine technology
Art means.Most domestic engine production quotient carries out technological improvement and product development by introducing external electric-control system at present,
However foreign vendor often takes electric-control system and calibration software bundle sale mode, price with the advantage on core electronic control technology
Valuableness loses right of speech.A kind of HCCI natural gas/diesel for supporting inlet manifold multi-point injection is developed thus, it is necessary to explore
Electric control system of dual-fuel engine supports the research and development of dual fuel engine.
Summary of the invention
The present invention proposes that the quasi-Homogeneous charge of multi-point injection is calmed the anger liquid electric control system of dual-fuel engine, can be using natural
Air inflow, fuel injection amount, natural gas supply amount are accurately controlled on gas-diesel oil dual fuel engine, and are formulated relatively reasonable
Fueling strategy.
The present invention uses following technical scheme.
The quasi-Homogeneous charge of multi-point injection is calmed the anger liquid electric control system of dual-fuel engine, and it is logical that the system comprises gas pressure-reducings
Road, oil circuit, fuel injection device, cylinder and control unit；The gas pressure-reducing channel is connected with fuel injection device
And to its export reduced pressure treatment after combustion gas；The oil circuit is connected with fuel injection device and exports fuel oil to it；The fuel
Injection apparatus is communicated with cylinder, and when engine is in cylinder compression stroke, the fuel injection device is arrived in piston
Fuel oil is sprayed into atomizer by cylinder before up to top dead centre；When engine is in cylinder intake stroke, fuel injection device with
Fuel gas injection valve is filled with combustion gas in cylinder；Described control unit includes ECU, valve control module and engine operating condition acquisition sensing
Device；The ECU storage has control strategy corresponding with engine operating condition, and ECU determines fuel oil by control strategy according to engine operating condition
With the time for spraying of combustion gas, and the amount of injection of fuel oil and combustion gas is determined by fuzzy control.
The combustion gas is natural gas, and the gas pressure-reducing channel includes the LNG gas in the setting of fuel gas transmission side's upstream sequence
Tank, water bath type vaporizer, natural air cleaner, solenoid valve, pressure reducing valve；Gas pressure-reducing channel is through flowmeter, surge tank, injection valve
Spray rail is communicated with the fuel gas injection valve of fuel injection device.
The engine uses plunger type double-row hole mixer, and the mixer is installed at inlet manifold, the air inlet
Manifold is communicated with injection valve spray rail.
The injection valve spray rail includes input gas rail, output gas rail, securing member, into the gaseous state day of injection valve spray rail
After right gas is first sent into input gas rail pressure stabilizing cavity space pressure stabilizing, then through output gas rail pressure stabilizing cavity space export to engine into
Gas manifold.
When injection valve spray rail work, threaded hole of the gasification natural gas in the middle part of input gas rail enters input gas rail pressure stabilizing cavity
Body space, makes to input gas rail pressure stabilizing cavity space quickly and uniform storage predetermined amount gasification natural gas is with pressure stabilizing, inputs gas rail
Gasification natural gas in pressure stabilizing cavity space reaches the spray rail being installed between input gas rail and input gas rail from the first leadout hole
It exports at injection valve, then after entering output gas rail pressure stabilizing cavity space from the second leadout hole to inlet manifold, to realize engine
Stablize the requirement of air inlet；The start-up time and opening time of the spray rail injection valve are controlled by ECU.
The fuel gas injection valve connects with the mixer of motor intake manifold；It is equipped at the inlet manifold for adjusting
The air throttle position of air input of engine by air, ECU control air throttle position aperture according to engine operating condition.
The control strategy corresponding with engine operating condition of ECU storage, correspond to operating condition include engine start operating condition,
Engine conventional speeds operating condition, racing of the engine operating condition, engine urgency accelerating mode, engine urgency decelerating mode and engine are idle
Fast operating condition；The engine operating condition acquisition sensor includes cooling-water temperature transmitter, fuel temperature sensor, camshaft location
Sensor, crankshaft position sensor, accelerator pedal sensor；When the engine is running, ECU is according to cooling water temperature, fuel oil temperature
Degree, engine speed, accelerator pedal position carries out operating condition judgement, and selects corresponding control strategy.
The engine operating condition acquisition sensor further includes engine speed sensor and throttle position switch；The hair
The operating mode of motivation switches between pure diesel oil list fuel work mode and double fuel operating mode by mode conversion switch；Institute
It states ECU and judges whether engine uses double fuel Working mould according to tach signal, throttle position signal and mode conversion switch
Formula；When engine operation is when double fuel operating mode, ECU retrieves day according to crankshaft, camshaft and accelerator pedal position signal
Right gas jet policy data, to obtain the fuel injection amount and natural gas injection amount under corresponding operating condition, fuel gas injection valve injection
Natural gas mix with air after enter cylinder, further mixed in the induction stroke of cylinder, compression stroke with air, then by
The fuel oil oil of penetrating, which ignites, to burn；ECU controls the amount of injection of fuel oil and combustion gas according to the working condition of engine, makes to send out
Motivation is under double fuel operating mode with the operation of best fuel mixing ratio.
The atomizer, fuel gas injection valve are controlled with pulse width modulation mode.
The fuel oil is diesel oil；Diesel fuel filter is equipped at the oil circuit；Oil circuit beginning communicated with diesel fuel tank and end with
Atomizer connects；Atomizer rear portion is equipped with electronically controlled unit pump.
The present invention is provided with gas pressure-reducing channel on natural gas supply channel, and gas pressure-reducing sets pressure reducing valve and spray in channel
Valve spray rail is penetrated, therefore can allow and natural gas depressurization and be able to maintain constant output pressure, to promote the control effect of electric-control system
Fruit.
Mixer for natural gas in use of the invention is mounted on inlet manifold using plunger type double-row hole mixer, can shorten
The gaseous mixture of natural gas and air reduces electric-control system and changes the control of natural gas injection amount to reality to the distance of cylinder
Border enters the gaseous mixture changed time difference of cylinder, improves response speed.
ECU(car running computer of the invention) in terms of operating condition judgement, can according to the driving style of setting, gas pedal and
The revolving speed of engine.To judge that the use pattern of engine and the operating condition of engine, operating condition include starting, being idle
Speed, operation, acceleration, deceleration and speed limit etc.；The present invention is (to form the control strategy mapable of the parameters such as distributive value, jet amount
MAP), the MAP of the parameters such as corresponding distributive value, jet amount can be searched according to operating condition and fuel mode；And cubic spline is inserted
Value calculates the parameters such as jet amount and distributive value；For MAP as a two-dimemsional number table, abscissa is revolving speed, and ordinate is load；MAP
Be according to big flux matched experiment, carry out that full working scope complex optimum obtains as a result, due to directly retrieving corresponding control from MAP
Strategy, so as to significantly improve the response speed of electric-control system；And the present invention can be counted according to the calibration curve of solenoid valve
Jet pulsewidth is calculated, and is modified using air themperature, gas pressure and temperature, moreover it is possible to according to oil pump characteristic curve, be calculated
Device fuel injection pulsewidth sprays closed loop conditions as fuel oil.
ECU of the invention can correct diesel injection amount, natural gas injection amount in real time；When engine is run, the failure of ECU
The each system working condition of diagnostic module real-time monitoring, when some unexpected situations occur, alarm system can sound an alarm and basis
Engine failure point reason carries out troubleshooting.
Detailed description of the invention
The present invention is described in more detail with reference to the accompanying drawings and detailed description:
Attached drawing 1 is structural schematic diagram of the invention；
Attached drawing 2 is the partial schematic diagram of injection valve spray rail；
Attached drawing 3 is system principle schematic diagram of the invention；
Attached drawing 4 is logical architecture schematic diagram of the invention；
Attached drawing 5 is the schematic diagram of microprocessor module of the invention；
Attached drawing 6 is the schematic diagram of analogue signal acquisition circuit；
Attached drawing 7 is the pulse signal circuit of pulse width modulation controlled；
Attached drawing 8 is power module circuitry figure of the invention；
Attached drawing 9 is the schematic diagram of the high-power booster circuit of BOOST built in the present invention；
Attached drawing 10 is workflow schematic diagram of the invention；
Attached drawing 11 is program circuit schematic diagram of the present invention in engine start；
Attached drawing 12 is the flow diagram when present invention makes engine operation double fuel operating mode；
In figure: 101- gas tank；102- water bath type vaporizer；The natural air cleaner of 103-；104- solenoid valve；105- decompression
Valve；106- flowmeter；107- surge tank；108- injection valve sprays rail；109- mixer；110- air throttle position；111- atomizer；
112- piston；113- cooling-water temperature transmitter；114- CMPS Camshaft Position Sensor；115- crankshaft position sensor；116-
ECU；117- electronically controlled unit pump；118- fuel temperature sensor；119- diesel fuel filter；120- diesel fuel tank；
201- inputs gas rail；202- securing member；203- exports gas rail；205- securing member；206- exports gas rail
Pressure stabilizing cavity space；The second leadout hole of 208-；The first leadout hole of 209-；211- inputs gas rail pressure stabilizing cavity space；212- screw thread
Hole；
301- inlet manifold.
Specific embodiment
As shown in figs. 1-12, the quasi-Homogeneous charge of multi-point injection is calmed the anger liquid electric control system of dual-fuel engine, the system
Including gas pressure-reducing channel, oil circuit, fuel injection device, cylinder and control unit；The gas pressure-reducing channel and combustion
Expect injection apparatus be connected and to its export reduced pressure treatment after combustion gas；The oil circuit is connected with fuel injection device and exports to it
Fuel oil；The fuel injection device is communicated with cylinder, when engine is in cylinder compression stroke, the fuel injection
Fuel oil is sprayed into cylinder with atomizer 111 before piston 112 reaches top dead centre by device；When engine is in cylinder intake stroke
When, fuel injection device is filled with combustion gas in cylinder with fuel gas injection valve；Described control unit includes ECU116, valve control module
Sensor is acquired with engine operating condition；The ECU storage has control strategy corresponding with engine operating condition, and ECU is according to engine work
Condition is determined the time for spraying of fuel oil and combustion gas by control strategy, and the amount of injection of fuel oil and combustion gas is determined by fuzzy control.
The combustion gas is natural gas, and the gas pressure-reducing channel includes the LNG gas in the setting of fuel gas transmission side's upstream sequence
Tank 101, water bath type vaporizer 102, natural air cleaner 103, solenoid valve 104, pressure reducing valve 105；Gas pressure-reducing channel is through flow
Meter 106, surge tank 107, injection valve spray rail 108 are communicated with the fuel gas injection valve of fuel injection device.
The engine uses plunger type double-row hole mixer, and the mixer 109 is installed at inlet manifold, it is described into
Gas manifold is communicated with injection valve spray rail 108.
The injection valve spray rail includes input gas rail 201, output gas rail 203, securing member 202 and 205, into injection
After the gaseous natural gas of valve spray rail is first sent into input 211 pressure stabilizing of gas rail pressure stabilizing cavity space, then it is empty through output gas rail pressure stabilizing cavity
Between 206 output to engine inlet manifold.
When injection valve spray rail work, gasification natural gas enters input gas rail from the threaded hole 212 at 201 middle part of input gas rail
Pressure stabilizing cavity space 211, makes to input gas rail pressure stabilizing cavity space 211 quickly and uniform storage predetermined amount gasification natural gas is with steady
Pressure, the gasification natural gas inputted in gas rail pressure stabilizing cavity space are installed on input gas rail 201 and defeated from the arrival of the first leadout hole 209
Enter at the spray rail injection valve between gas rail 203, then from the second leadout hole 208 enter output gas rail pressure stabilizing cavity space 206 after it is defeated
Gas manifold is fed in, to realize the requirement of engine stabilizer air inlet；When the start-up time and opening of the spray rail injection valve
Between controlled by ECU.
The fuel gas injection valve connects with the mixer 109 of motor intake manifold；It is equipped with and is used at the inlet manifold
The air throttle position 110 of air input of engine by air is adjusted, ECU controls air throttle position aperture according to engine operating condition.
The control strategy corresponding with engine operating condition of ECU storage, correspond to operating condition include engine start operating condition,
Engine conventional speeds operating condition, racing of the engine operating condition, engine urgency accelerating mode, engine urgency decelerating mode and engine are idle
Fast operating condition；The engine operating condition acquisition sensor includes cooling-water temperature transmitter 113, fuel temperature sensor 118, cam
Shaft position sensor 114, crankshaft position sensor 115, accelerator pedal sensor；When the engine is running, ECU is according to cooling water
Temperature, fuel oil temperature, engine speed, accelerator pedal position carries out operating condition judgement, and selects corresponding control strategy.
The engine operating condition acquisition sensor further includes engine speed sensor and throttle position switch；The hair
The operating mode of motivation switches between pure diesel oil list fuel work mode and double fuel operating mode by mode conversion switch；Institute
It states ECU and judges whether engine uses double fuel Working mould according to tach signal, throttle position signal and mode conversion switch
Formula；When engine operation is when double fuel operating mode, ECU retrieves day according to crankshaft, camshaft and accelerator pedal position signal
Right gas jet policy data, to obtain the fuel injection amount and natural gas injection amount under corresponding operating condition, fuel gas injection valve injection
Natural gas mix with air after enter cylinder, further mixed in the induction stroke of cylinder, compression stroke with air, then by
The fuel oil oil of penetrating, which ignites, to burn；ECU controls the amount of injection of fuel oil and combustion gas according to the working condition of engine, makes to send out
Motivation is under double fuel operating mode with the operation of best fuel mixing ratio.
The atomizer, fuel gas injection valve are controlled with pulse width modulation mode.
The fuel oil is diesel oil；Diesel fuel filter 119 is equipped at the oil circuit；Oil circuit beginning communicated with diesel fuel tank 120 and
End connects with atomizer 111；Atomizer rear portion is equipped with electronically controlled unit pump 117.
Embodiment 1:
As shown in Figure 3-4, the output terminal of engine operating condition acquisition sensor is connected with the input terminal of ECU, controls
The output end of unit and each solenoid valve and switch connect.The selection MC9S12XET256MAL of above-mentioned control unit, one-chip computer module
Including Flash program memory, EEPROM data storage, serial communication port, the passway CAN, I/O, interrupt system, A/D turn
The modules such as parallel operation, house dog and programmable PIT timer/counter, wherein functional module includes digital collection module, power drive
Dynamic and protective module, power module and display and alarm module.
Embodiment 2:
As shown in figure 5, the microprocessor control module built in ECU is by crystal oscillator, memory RAM, ROM and reset circuit group
At the basic role of reset circuit is: when system electrification work, it is capable of providing reset signal, after the power good of system,
Reset signal can be cancelled rapidly.Furthermore after power good, need to cancel reset letter after certain delay time
Number, to prevent power switch during dividing-closing, it may occur that shake reduces reliability and stability to influence to reset.The present invention
The reset circuit of design increases diode on basic reset circuit, it is therefore an objective to which after power cut-off the purpose of is when power supply is disconnected
After electricity, capacitor passes through the rapid electric discharge of diode, after power up, can automatically reset by powering on, improve reliability.
Embodiment 3:
The RC filter circuit that the collection of simulant signal part of engine operating condition acquisition sensor is made of capacitor and resistance, filter
Wave circuit input terminal obtains coolant temperature, fuel oil temperature, accelerator pedal position, throttle position, battery voltage feedback letter
Breath, wherein temperature signal and accelerator pedal signal need the input filter circuit after pretreatment.
Embodiment 4:
Engine operating condition acquires in sensor, and the sensor set on camshaft and crank position is Hall-type, needs believing
Number end add a 5.1k 5v pull-up resistor.
Embodiment 5:
System of the present invention is powered with power module, and the major function of power module is: (1) mono- for MC9S12XET256
Piece machine provides stable working power；(2) power supply of peripheral interface circuit is provided；(3) each sensor and each actuator institute are provided
The power supply needed.It is the BUCK reduction voltage circuit of 24V-5V used in power module, selects two pieces of LM2596 switching modes integrated respectively
Voltage stabilizing chip is a 3A circuit output step-down switching type integrated voltage-stabilized chip for providing 5V M2596 switching regulator IC,
With preferable linear and Load Regulation characteristic.In the case where certain input voltage and output loading, output voltage can
It is maintained in ± 4% error range, if having the function of that circuit, current limit and Thermal shutdown circuit etc. is protected to give control core
The power supply such as piece, sensor signal processing module and CAN communication module.Power supply is formed by being connected in parallel on two capacitors of both ends of power
Filter circuit after, eliminate High-frequency Interference, after through LM2596 chip and inductance coil L1 obtain low frequency+5V export electricity
Pressure.In addition to this, it is also provided with indicator light circuit in circuit, after control system starts power supply, light emitting diode is lit.
The power circuit that 15v has also been devised in the present invention is similar with the power circuit of 5V, mainly to sensor, natural gas nozzle and spray
Mouth drive module.
Embodiment 6:
It is more satisfactory to achieve the effect that solenoid-driven when the valve being arranged in the present invention is solenoid valve, it needs to match
High voltage power supply is closed to be driven；The present invention selects control chip of the UC3843 chip as booster circuit, the chip be it is a can
For driving the PWM signal generator of NMOS pipe, this is packaged with eight pins, suitable for requiring low side driving MOS pipe
The structures booster circuit such as boosting, flyback.The working frequency of UC3843 is between 100kHz~1MHz, in higher work
It works under working frequency and smaller size of component package may be selected.
Embodiment 7:
As shown in Figure 10, function of the invention include including power-on self-test, scale variation, system initialization, fault diagnosis,
Operating condition judgement, timing calculating, MAP operation, control amount amendment, telecommunication management.
When the system is initiated, by PLL, PIT, ECT, SPI, IO, FLASH, SPI, CAN etc. of configuration MC9S12XET256
Module corresponding registers carry out system function setting.
It is handled when acquiring operating condition using scale variation, since the factors such as vibration in collection process can generate wave
It is dynamic, therefore, filtering and mean value computation are needed to analog signal.It is in acquisition tasks that continuous acquisition 4 times data are big according to numerical value
It is small to be ranked up, the measured value that the 2nd, 3 time acquires is gone to calculate average value.After obtained average value and according to transducer calibration song
Digital quantity is converted into corresponding physical quantity by line.
Startup separator diagnoses when a failure occurs it, and ECU is according to sensing data and other relevant operation results.Judgement passes
The failure of sensor and actuator and abnormal work such as catch fire, are on the one hand stored in SD card for error code, on the other hand mention to PIT
For error code parameter, it to be used for driving malfunction indicator light.
Operating condition judgement in function is the driving style of the setting of basis, the revolving speed of gas pedal and engine.To sentence
The use pattern of disconnected engine and the operating condition of engine.Operating condition packages dynamic, idling, operation, acceleration, deceleration and limit
Speed etc..
MAP operation in function is to search the parameters such as corresponding distributive value, jet amount according to operating condition and fuel mode
MAP, and cubic spline interpolation calculates the parameters such as jet amount and distributive value.For MAP as a two-dimemsional number table, abscissa is to turn
Speed, ordinate are load.MAP is to carry out the result that full working scope complex optimum obtains according to big flux matched experiment.
Control amount amendment in function is the calibration curve according to solenoid valve, calculates jet pulsewidth, and utilize coolant liquid temperature
Degree and fuel oil temperature are modified.According to oil pump characteristic curve, calculator fuel injection pulsewidth sprays closed loop conditions as fuel oil.
Timing ga(u)ge in function utilizes the input capture of single-chip microcontroller at last, can read between two gear teeth of crankshaft signal
Time interval obtains fuel supply advance angle and pulsewidth according to engine operating condition, shifts to an earlier date when obtaining the fuel feeding that one shifts to an earlier date 10 degree
Angle, the position of our known 19th angle compression top center.In this case, a gear has 6 degree, is 108 degree to the 19th gear,
17th gear mesh answers 96 degree, using output comparing function, starts counting, to the 98th degree of enabled engine spray function, really
Determine timing.
Telecommunication management in function is to be communicated through the invention with PC host computer, the work that can run some engines
Condition information is sent to PC, while PC also can use the MAP in host computer modification program of lower computer, and then it is different to debug engine
Parameter under operating condition.
Embodiment 8:
The control strategy that the present invention as shown in figure 11 takes engine start, the present invention are started with pure diesel fuel mode,
And time for spraying and fuel delivery are determined according to revolving speed, it is smoldered with achieving the purpose that reduce, concrete measure is as follows: being lower than in engine
In the range of speeds of 400r/min, not oil spout is started in ECU control, after being higher than the revolving speed, is initially supplied certain oil mass, the oil mass
It is demarcated on the basis of certain specific environment, considers further that the working condition of engine itself is that cold start or heat rise
It is dynamic, if engine determines whether cold start or hot exposure according to coolant temperature, increases and start if if it is cold start
The starting distributive value of machine is reduced by its distributive value if it is hot exposure, increases distributive value if one push start is not successful, turns
It is resulting by specific experiment that speed selection, which is greater than 400r/min,.
Embodiment 9:
As shown in figure 12, it when the present invention enters dual fuel mode under pure diesel fuel mode, first has to meet the following conditions cold
But for liquid temperature at 45 degree or more, the revolving speed of engine is greater than 1000 turns, can switch dual fuel mode, natural gas injection at this time
Moment is set to the every cylinder of engine when be in suction stroke, and ECU tables look-up according to revolving speed and load and finds out injection order, tolerance with
Oil mass.
Claims (6)
- The liquid electric control system of dual-fuel engine 1. the quasi-Homogeneous charge of multi-point injection is calmed the anger, it is characterised in that: the system comprises Gas pressure-reducing channel, oil circuit, fuel injection device, cylinder and control unit；The gas pressure-reducing channel and fuel spray Injection device be connected and to its export reduced pressure treatment after combustion gas；The oil circuit is connected with fuel injection device and fires to its output Oil；The fuel injection device is communicated with cylinder, when engine is in cylinder compression stroke, the fuel injection dress It sets and fuel oil is sprayed into atomizer (111) by cylinder before piston (112) reach top dead centre；When engine is in cylinder intake row Cheng Shi, fuel injection device are filled with combustion gas in cylinder with fuel gas injection valve；Described control unit includes ECU(116), valve control Module and engine operating condition acquire sensor；ECU storage has a control strategy corresponding with engine operating condition, and ECU is according to starting Machine operating condition is determined the time for spraying of fuel oil and combustion gas by control strategy, and the injection of fuel oil and combustion gas is determined by fuzzy control Amount；The fuel gas injection valve connects with the mixer (109) of motor intake manifold；It is equipped at the inlet manifold for adjusting The air throttle position (110) of whole air input of engine by air, ECU control air throttle position aperture according to engine operating condition；The control strategy corresponding with engine operating condition of the ECU storage, corresponds to operating condition and includes engine start operating condition, starts Machine conventional speeds operating condition, racing of the engine operating condition, engine urgency accelerating mode, engine urgency decelerating mode and engine idling work Condition；The engine operating condition acquisition sensor includes cooling-water temperature transmitter (113), fuel temperature sensor (118), cam Shaft position sensor (114), crankshaft position sensor (115), accelerator pedal sensor；When the engine is running, ECU is according to cold But coolant-temperature gage, fuel oil temperature, engine speed, accelerator pedal position carries out operating condition judgement, and selects corresponding control strategy；The engine operating condition acquisition sensor further includes engine speed sensor and throttle position switch；The engine Operating mode switch between pure diesel oil list fuel work mode and double fuel operating mode by mode conversion switch；It is described ECU judges whether engine uses double fuel operating mode according to tach signal, throttle position signal and mode conversion switch； When engine operation is when double fuel operating mode, ECU retrieves natural gas according to crankshaft, camshaft and accelerator pedal position signal Injection strategy data, to obtain the fuel injection amount and natural gas injection amount under corresponding operating condition, the day of fuel gas injection valve injection Right gas enters cylinder after mixing with air, and further mixes in the induction stroke of cylinder, compression stroke with air, then by spraying into Fuel oil oil ignite and burn；ECU controls the amount of injection of fuel oil and combustion gas according to the working condition of engine, makes engine With the operation of best fuel mixing ratio under double fuel operating mode；The ECU has MAP calculation function；The MAP operation is to search corresponding oil spout according to operating condition and fuel mode The MAP of the parameters such as amount, jet amount, and cubic spline interpolation calculate jet amount and distributive value parameter；The MAP is as one two Dimension table, abscissa are revolving speed, and ordinate is load；MAP is to carry out the result set that full working scope complex optimum obtains according to big flux matched experiment；Solenoid valve is equipped at the gas pressure-reducing channel；The ECU has control amount debugging functions；The control amount amendment is root According to the calibration curve of solenoid valve, jet pulsewidth is calculated, and is modified using coolant temperature and fuel oil temperature；According to oil pump characteristic curve, calculator fuel injection pulsewidth sprays closed loop conditions as fuel oil；The ECU utilizes the input capture of single-chip microcontroller, can read the time interval between two gear teeth of crankshaft signal, according to Engine operating condition obtains fuel supply advance angle and pulsewidth, obtains the fuel supply advance angle for shifting to an earlier date 10 degree, if known 19th angle is pressed The position of contracting top dead centre is 108 degree to the 19th gear if a gear has 6 degree, and the 17th gear mesh answers 96 degree, works as ECU When starting counting using output comparing function, then to the 98th degree of enabled engine spray function, timing is determined；The solenoid valve cooperation high voltage power supply is driven；Operating condition judgement can also be according to the driving style of setting, and the revolving speed of gas pedal and engine judges engine The operating condition of use pattern and engine；The operating condition includes starting, idling, operation, acceleration, deceleration and speed limit；The atomizer, fuel gas injection valve are controlled with pulse width modulation mode.
- The liquid electric control system of dual-fuel engine 2. the quasi-Homogeneous charge of multi-point injection according to claim 1 is calmed the anger, it is special Sign is: the combustion gas is natural gas, and the gas pressure-reducing channel includes the LNG gas tank in the setting of fuel gas transmission side's upstream sequence (101), water bath type vaporizer (102), natural air cleaner (103), solenoid valve (104), pressure reducing valve (105)；Gas pressure-reducing is logical Road is communicated through flowmeter (106), surge tank (107), injection valve spray rail (108) with the fuel gas injection valve of fuel injection device.
- The liquid electric control system of dual-fuel engine 3. the quasi-Homogeneous charge of multi-point injection according to claim 2 is calmed the anger, it is special Sign is: the engine uses plunger type double-row hole mixer, and the mixer (109) is installed at inlet manifold, described Inlet manifold is communicated with injection valve spray rail (108).
- The liquid electric control system of dual-fuel engine 4. the quasi-Homogeneous charge of multi-point injection according to claim 3 is calmed the anger, it is special Sign is: injection valve spray rail includes input gas rail (201), output gas rail (203), securing member (202) and (205), After the gaseous natural gas for spraying rail into injection valve is first sent into input gas rail pressure stabilizing cavity space (211) pressure stabilizing, then through exporting gas rail Pressure stabilizing cavity space (206) is exported to the inlet manifold of engine.
- The liquid electric control system of dual-fuel engine 5. the quasi-Homogeneous charge of multi-point injection according to claim 4 is calmed the anger, it is special Sign is: when injection valve spray rail work, threaded hole (212) of the gasification natural gas in the middle part of input gas rail (201) enters input Gas rail pressure stabilizing cavity space (211) makes to input gas rail pressure stabilizing cavity space (211) quickly and uniform storage predetermined amount gasification day With pressure stabilizing, the gasification natural gas inputted in gas rail pressure stabilizing cavity space reaches from the first leadout hole (209) and is installed on input right gas At spray rail injection valve between gas rail (201) and input gas rail (203), then it is steady from the second leadout hole (208) into output gas rail Pressure cavity space (206) is exported afterwards to inlet manifold, to realize the requirement of engine stabilizer air inlet；The spray rail injection valve Start-up time and opening time controlled by ECU.
- The liquid electric control system of dual-fuel engine 6. the quasi-Homogeneous charge of multi-point injection according to claim 1 is calmed the anger, it is special Sign is: the fuel oil is diesel oil；Diesel fuel filter (119) are equipped at the oil circuit；Oil circuit beginning is communicated with diesel fuel tank (120) And end connects with atomizer (111)；Atomizer rear portion is equipped with electronically controlled unit pump (117).
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| CN201811282170.8A CN109184903B (en) | 2018-10-31 | 2018-10-31 | The quasi-Homogeneous charge of multi-point injection is calmed the anger liquid electric control system of dual-fuel engine |
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| CN103016168A (en) * | 2011-09-22 | 2013-04-03 | 北京易控凌博汽车电子技术有限公司 | Diesel engine/natural gas dual-fuel engine electric control system |
| CN103982308A (en) * | 2014-05-06 | 2014-08-13 | 南京盖驰动力科技有限公司 | Control system and control method of oil/gas dual-fuel engine in electronic control oil supply |
| CN105697161A (en) * | 2016-02-03 | 2016-06-22 | 福州大学 | Control system of LNG/diesel oil dual-fuel engine |
| CN207583546U (en) * | 2017-12-02 | 2018-07-06 | 福州大学 | Support the dual fuel engine gas supply gas rail of electric controlled multi-point injection |
| CN109026374A (en) * | 2018-07-25 | 2018-12-18 | 福州大学 | Natural gas Diesel Dual-Fuel Engine and control method based on excess air coefficient |
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2018
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103016168A (en) * | 2011-09-22 | 2013-04-03 | 北京易控凌博汽车电子技术有限公司 | Diesel engine/natural gas dual-fuel engine electric control system |
| CN103982308A (en) * | 2014-05-06 | 2014-08-13 | 南京盖驰动力科技有限公司 | Control system and control method of oil/gas dual-fuel engine in electronic control oil supply |
| CN105697161A (en) * | 2016-02-03 | 2016-06-22 | 福州大学 | Control system of LNG/diesel oil dual-fuel engine |
| CN207583546U (en) * | 2017-12-02 | 2018-07-06 | 福州大学 | Support the dual fuel engine gas supply gas rail of electric controlled multi-point injection |
| CN109026374A (en) * | 2018-07-25 | 2018-12-18 | 福州大学 | Natural gas Diesel Dual-Fuel Engine and control method based on excess air coefficient |
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