CN107061064A - A kind of equivalent combustion system and its control method based on air-fuel mixture enleanment - Google Patents
A kind of equivalent combustion system and its control method based on air-fuel mixture enleanment Download PDFInfo
- Publication number
- CN107061064A CN107061064A CN201710367727.7A CN201710367727A CN107061064A CN 107061064 A CN107061064 A CN 107061064A CN 201710367727 A CN201710367727 A CN 201710367727A CN 107061064 A CN107061064 A CN 107061064A
- Authority
- CN
- China
- Prior art keywords
- cylinder
- air
- fuel injector
- dimethyl ether
- control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
- 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
-
- 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)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The invention discloses a kind of equivalent combustion system and its control method based on air-fuel mixture enleanment, device includes the air inlet for turbocharger air compressor, electric booster, air intake heater, air intake intercooler, pressure sensor, temperature sensor, air flue fuel injector and the cylinder being sequentially connected by air intake duct house steward, and EGR line one end is communicated with the air intake duct house steward between air intake heater, air intake intercooler and the other end is sequentially connected the part that EGR check valves, electric control EGR valve, EGR charge air coolers and blast pipe are connected with the exhaust outlet of cylinder；Polymethoxy dimethyl ether direct-injection fuel injector is arranged in cylinder, and blast pipe is sequentially connected exhaust outlet, exhaust gas turbine, exhaust gas oxygen sensor and the triple-effect catalytic unit of cylinder；Inlet valve evening pass device is installed on cylinder cover, cylinder pressure sensor is installed in cylinder.Ultralow nitrogen oxides and soot emissions are kept while fuel consumption is improved using the present apparatus and method.
Description
Technical field
The present invention relates to field of internal combustion engine, more particularly to a kind of equivalent proportion combustion system based on air-fuel mixture enleanment and its
Control method.
Background technology
The high homogeneous charge compression ignition of diesel oil/gasoline double-fuel (HPCC) combustion mode is ignited air flue using in-cylinder direct-jet diesel fuel
The Fuel Petroleum of injection, can be in more broad condition range by chemistry of fuel activity and concentration stratification Collaborative Control
Part, which solves diesel engine, can not reduce NO simultaneouslyxWith the problem of soot, the higher thermal efficiency is maintained.But can not be from root
The defect of Low Temperature Combustion of Diesel Engine is broken through in sheet, is limited by catch fire and is difficult to control to exothermic process, big load extension is limited first
Cause the problem of peak value Pressure Rise Rate is too high in burn rate is too fast, if to extend diesel oil/gasoline double-fuel HPCC big load,
Need the discarded recycling (EGR) of greater proportion to dilute, while reducing compression ratio, but be still difficult in actual engine
Full load mode is covered, the EGR of one side vast scale can bring deficiency of air so that being difficult to ensure that fresh under high load working condition
The demand of air, while smoke emission and imperfect combustion product can be caused to rise sharply.If by improve plenum degree come
Air inflow and the demand of dilution factor are met, the elevated problem of detonation pressure in cylinder, current technical conditions and cost limitation can be produced again
Under, it is difficult to the demand of double fuel HPCC low temperature combustion modes is met by greatly improving the peak value detonation pressure limit value of diesel engine, and
Excessively reduction compression ratio is unfavorable for the performance of Smaller load or high speed conditions again.In addition HPCC small load condition region in order to
Ensure premix degree and suppress mean temperature in cylinder, it is necessary to assure certain EGR rate and air flue gasoline injection calorific value ratio, but
Thin gaseous mixture and ignition energy deficiency can ensure the unstability of burning, and relatively low oxygen concentration is unfavorable for the complete of HC and CO
Oxidation, imperfect combustion product withdraw is higher by several magnitudes than conventional diesel engine, even under efficient middle and high loading condiction
Diesel oil/gasoline double-fuel HPCC efficiency of combustion is still lower than conventional diesel engine by more than 2%, and there are some researches show due to not exclusively combustion
The discharge capacity for burning product is high, in small load condition Diesel engine oxidation catalyst to double fuel HPCC low temperature combustion modes
HC and CO transformation efficiencies be almost 0, and the transformation efficiency point of the conventional diesel combustion pattern under the conditions of identical arranges temperature
Not Wei 80% and 100%, be accomplished by developing a kind of brand-new efficient cryogenic for HPCC to meet HC and CO emission request and urge
Oxidation device.It is difficult to meet increasingly strict Abgasgesetz to HC/CO demand, it is necessary to using the height in full load scope
The realization of effect cleaning burning is still HPCC major technology bottleneck.
The concentration of gaseous mixture, activity layering are dominated by in-cylinder direct-jet in the cylinder of double fuel HPCC combustion modes, therefore direct-injection
Preparation of the physicochemical property of fuel to gaseous mixture in cylinder, the control of combustion process and the generation of emission have important shadow
Ring.
Polymethoxy dimethyl ether (PODE) be by parent of dimethoxymethane, methylene epoxide for main chain acetal Type of Collective
Thing.The average Cetane number of polymethoxy dimethyl ether (PODE) can up to more than 76, higher than conventional diesel fuel (Cetane number~
50)；Its volatility is less than methanol and dimethyl ether, higher than diesel oil, and can make its physical property by adjusting the ratio of wherein different component
Closer to diesel oil；Polymethoxy dimethyl ether (PODE) without aromatic hydrocarbons, is free of C-C keys without sulphur in molecule, oxygen content increases with molecular weight
And increase, oxygen content mass fraction is up to 45%-48.5%；In addition polymethoxy dimethyl ether (PODE) and most of common used materials
There is good compatibility, it is corrosion-free to engine metal part and environmentally friendly.Because PODE oxygen content is high, stoichiometry
Air-fuel ratio is relatively low, and the air capacity needed for burning is relatively fewer completely, thus can effectively reduce particulate matter, CO, HC of diesel engine
Discharge, is ideal diesel replacement fuel or additive.But the form of pure polymethoxy dimethyl ether (PODE) is difficult to directly
For traditional diesel engine, on the one hand, its unit volume calorific value of polymethoxy dimethyl ether (PODE) is far below diesel oil, only diesel oil
50% or so of fuel, uses the volume flow that pure polymethoxy dimethyl ether (PODE) will dramatically increase fuel supply, unit heat
Value needs longer oil injection duration, thus needs to be improved fuel oil supply system and Injection strategy, is unfavorable for engine
The raising of the thermal efficiency and the requirement for meeting power performance；On the other hand, the too high Cetane number of polymethoxy dimethyl ether (PODE)
Also it is unfavorable for the tissue of combustion process.But polymethoxy dimethyl ether (PODE) realizes that double fuel HPCC burnings exist as direct injection fuel
Using more of practical meaning on diesel engine.For double fuel HPCC combustion modes, because in-cylinder direct-jet ratio is relatively small,
Even if the calorific value ratio of in-cylinder direct-jet polymethoxy dimethyl ether (PODE) reaches 50%, conventional fuel system can also meet poly- methoxy
The direct-injection demand of base dimethyl ether (PODE), while the direct-injection volume increase of unit calorific value is also contributed in HPCC combustion mode cylinders
The layering of gaseous mixture and the control of multiple Injection strategy, with reference to longer oil injection duration, contribute to reinforcing to catching fire and firing
The control of burning process.High additionally, due to polymethoxy dimethyl ether (PODE) oxygen content, stoichiometric air-fuel ratio is relatively low, completely burning
Required air capacity is relatively fewer, thus can effectively reduce air inlet demand, realizes greater proportion EGR low-temperature burnings, gathers simultaneously
Methoxyl group dimethyl ether (PODE) fuel is high oxygen-containing and particulate matter, CO, HC under the conditions of low equivalent ratio can be reduced without C-C keys characteristic
Discharge, with the ability that ultralow soot emissions are realized under the conditions of low equivalent ratio；On the other hand, polymethoxy dimethyl ether (PODE)
Higher Cetane number can improve tolerance level of the combustion process to EGR, improve involuntary ignition of the fuel under the conditions of low equivalent ratio
Performance and combustion process, high thermal efficiency, reduction HC and CO discharges are kept while NOx and soot emissions is greatly reduced, can be changed
The involuntary ignition and combustion stability of low-temperature burning under kind small load condition.Therefore, polymethoxy dimethyl ether (PODE)/gasoline is double
Fuel HPCC possesses the potentiality for realizing Full-load high-efficiency cleaning burning.
The content of the invention
Change two kinds according to operating mode real-time online there is provided one kind it is an object of the invention to the shortcoming for overcoming prior art to fire
Expect the calorific value ratio of injection, the concentration of the optimal gaseous mixture needed for modulation operating mode, activity layering, control combustion phase and burning
Speed, while can improve density of the induced air and realize the thermal efficiency that admission pressure is controllable, improve middle-low load, is reduced effectively
The equivalent combustion system and its control method based on air-fuel mixture enleanment of compression ratio.
The present invention is to be achieved through the following technical solutions：
A kind of equivalent combustion system based on air-fuel mixture enleanment of the present invention, including be sequentially connected by air intake duct house steward
Turbocharger air compressor, electric booster, air intake heater, air intake intercooler, pressure sensor, temperature sensor, air flue
The air inlet of fuel injector and cylinder, EGR line one end is communicated with the air intake duct house steward between air intake heater, air intake intercooler
And the other end is sequentially connected EGR check valves, electric control EGR valve, EGR charge air coolers and blast pipe and is connected with the exhaust outlet of cylinder
Part, described turbocharger air compressor is coaxially connected with exhaust gas turbine；Polymethoxy dimethyl ether direct-injection fuel injector is installed
In cylinder, blast pipe is sequentially connected exhaust outlet, exhaust gas turbine, exhaust gas oxygen sensor and the triple-effect catalytic unit of cylinder；In cylinder
Cover and inlet valve evening is installed closes device, cylinder pressure sensor is installed in cylinder, ECU output end by control line with
Electric booster, electric control EGR valve, air flue fuel injector, inlet valve evening close device, polymethoxy dimethyl ether direct-injection fuel injector, exhaust
Lambda sensor and cylinder pressure sensor are connected.
The control method of equivalent combustion system based on air-fuel mixture enleanment, comprises the following steps：
Step 1: engine electric-controlled unit reads the tach signal of sensor, installation on engine crankshaft respectively
In gas pedal the position signalling of sensor and according to the signal read judge engine run load；
If Step 2: the judged result of step one be cold start-up and idling operation, it is straight using polymethoxy dimethyl ether
Injection injector carries out 100% polymethoxy dimethyl ether in-cylinder direct-jet；
Step 3: if the judged result of step one is small load condition, ECU reads demarcation MAP, then exports
Control signal gives polymethoxy dimethyl ether direct-injection fuel injector, by the control of polymethoxy dimethyl ether spray angle in -20~-40 DEG C of A
ATDC scopes, and it is to air flue fuel injector and polymethoxy dimethyl ether direct-injection fuel injector output pulse width control signal that gas-duct jetting is warm
Value ratio is controlled in the range of 50%~70%, and the dilute of in-cylinder combustion is judged according to the density of oxygen contained in discharged gas signal of exhaust gas oxygen sensor
Situation is released, controls in-cylinder mixture strength to be equal to 1 in equivalent proportion by adjusting EGR valve change EGR rate；
Step 4: if the judged result of step 1 is moderate duty operating mode, ECU reads demarcation MAP, using poly- first
The early spray strategy of epoxide dimethyl ether, spray angle is controlled in -45~-90 DEG C of A ATDC scopes, and to air flue fuel injector and poly- methoxy
Base dimethyl ether direct-injection fuel injector output pulse width control signal controls gas-duct jetting calorific value ratio in the range of 75%~95%, electricity
Control unit is controlled EGR rate in the range of 40-50% by adjusting EGR valve, and ECU is according to the exhaust of exhaust gas oxygen sensor
Oxygen concentration signal judges the dilution situation of in-cylinder combustion, by the supercharging level for adjusting the electric booster connected with turbocharger
In-cylinder mixture strength control is equal to 1 in equivalent proportion；
Step 5: if the judged result of step 1 is high load working condition, ECU reads demarcation MAP, using poly- methoxy
Base dimethyl ether evening spray strategy, spray angle is controlled in -5~-20 DEG C of A ATDC scopes, and to air flue fuel injector and polymethoxy two
Methyl ether direct-injection fuel injector output pulse width control signal controls gas-duct jetting calorific value ratio in the range of 50%~80%；Automatically controlled list
EGR rate is reduced in the range of 30%-40% by member by adjusting EGR valve, while row of the ECU according to exhaust gas oxygen sensor
Gas oxygen concentration signal judges the dilution situation of in-cylinder combustion, the boosting capability of electric booster is improved, by in-cylinder mixture strength
Control is equal to 1 in equivalent proportion, and the cylinder that ECU is exported according to cylinder pressure sensor presses signal, by controlling inlet valve evening pass
Device regulation inlet valve evening closes angle, effective compression ratio is reduced, by peak in-cylinder pressure control within limit value.
Compared with prior art, the present invention has following three aspects advantage：
Firstth, by direct-injection fuel injection mode different under different operating modes, high-efficiency cleaning combustion in broadness condition range can be achieved
Burn, ultralow nitrogen oxides and soot emissions are kept while fuel consumption is improved.
Secondth, charge is diluted by being combined under different operating modes using supercharging with EGR, while can be effective
The maximum temperature in cylinder is reduced, burn rate is controlled.In high load working condition in order to realize new charge amount demand, by control with
The boosting capability of the electric booster of turbocharger series connection improves admission pressure and air inflow.
3rd, the concentration stratification and activity of fuel is flexibly controlled to be layered by controlling different direct-injection oil injection times, it is real
The existing high Premixed combustion strategy of double fuel can ensure higher efficiency of combustion and relatively low nitrogen oxides and carbon under different operating modes
Cigarette is discharged.
4th, in full working scope scope, by the overall charge concentration of gaseous mixture in master cylinder in stoichiometric equivalents (i.e.
Amount air coefficient λ=1), it is allowed on a diesel engine using the triple-effect catalytic unit processing HC/CO of Cheap highly effective, realize high-efficiency cleaning
Burning.
5th, by using inlet valve variable technique, higher geometrical compression ratio can be used, is adopted with the increase of load
With the late pass technology reduction effective compression ratio of inlet valve, the thermal efficiency of middle Smaller load is on the one hand improved, is on the other hand extended big
Load operation condition range.
Brief description of the drawings
Fig. 1 is a kind of structure schematic diagram of equivalent combustion system based on air-fuel mixture enleanment of the present invention.
Embodiment
Below in conjunction with the accompanying drawings, the embodiment to the present invention is described in detail.
As shown in figure 1, a kind of equivalent combustion system based on air-fuel mixture enleanment of the present invention, including pass through air intake duct house steward
6 turbocharger air compressors 1 being sequentially connected, electric booster 2, air intake heater 3, air intake intercooler 5, pressure sensor P,
Temperature sensor T, air flue fuel injector 8 and cylinder air inlet, the one end of EGR line 14 and air intake heater 3, air intake intercooler
Air intake duct house steward 6 between 5 communicates and the other end be sequentially connected EGR check valves 4, electric control EGR valve 7, EGR charge air coolers 9 and
The part that blast pipe 17 is connected with the exhaust outlet of cylinder, described turbocharger air compressor 1 and the coaxial phase of exhaust gas turbine 15
Even；Polymethoxy dimethyl ether (PODE) direct-injection fuel injector 11 be arranged on cylinder in, blast pipe 18 be sequentially connected cylinder exhaust outlet,
Exhaust gas turbine 15, exhaust gas oxygen sensor 16 and triple-effect catalytic unit 17；Inlet valve evening pass device 10 is installed on cylinder cover, in gas
Cylinder pressure sensor 13 is installed in cylinder.
The output end of ECU 12 passes through control line and electric booster 2, electric control EGR valve 7, air flue fuel injector 8, inlet valve
Evening closes device 10, polymethoxy dimethyl ether (PODE) direct-injection fuel injector 11, exhaust gas oxygen sensor 16 and the phase of cylinder pressure sensor 13
Even.
In the flow of cold waste gas EGR gas controlled using electric control EGR valve 7, in order to prevent new charge from flowing backwards, in electricity
EGR check valves 4 are installed after control EGR valve 7.Plenum is connected realization by turbocharger air compressor 1 with electric booster 2
Two-step supercharging.
A kind of control method of equivalent combustion system based on air-fuel mixture enleanment of the present invention, comprises the following steps：
Step 1: engine electric-controlled unit 12 is read installed in the tach signal of sensor, peace on engine crankshaft respectively
In gas pedal the position signalling of sensor and according to the signal read judge engine run load；
If Step 2: the judged result of step one is cold start-up and idling operation, using polymethoxy dimethyl ether
(PODE) direct-injection fuel injector 11 carries out 100% polymethoxy dimethyl ether (PODE) in-cylinder direct-jet；
Step 3: if the judged result of step one is small load condition, ECU 12, which is read, demarcates MAP, then defeated
Go out control signal to polymethoxy dimethyl ether (PODE) direct-injection fuel injector 11, by polymethoxy dimethyl ether (PODE) spray angle control
System is in -20~-40 DEG C of A ATDC (i.e. after top dead center -20~-40 crank angle degrees) scope, and to air flue fuel injector 8 and poly- first
The output pulse width control signal of epoxide dimethyl ether (PODE) direct-injection fuel injector 11 is by gas-duct jetting calorific value ratio (i.e. air flue fuel injector 8
The ratio between the gross calorific value of the calorific value of the fuel oil of injection with entering internal combustion oil of cylinder) control in the range of 50%~70%.According to exhaust oxygen
The density of oxygen contained in discharged gas signal of sensor 16 judges the dilution situation of in-cylinder combustion, and EGR rate is changed by cylinder by adjusting EGR valve 7
Mixture strength control is equal to 1 in equivalent proportion；
Step 4: if the judged result of step 1 is moderate duty operating mode, ECU 12 reads demarcation MAP, using poly-
The early spray strategy of methoxyl group dimethyl ether (PODE), spray angle is controlled in -45~-90 DEG C of A ATDC scopes, and to air flue fuel injector 8
By gas-duct jetting calorific value ratio, (i.e. air flue sprays with the output pulse width control signal of polymethoxy dimethyl ether (PODE) direct-injection fuel injector 11
The ratio between the gross calorific value of the calorific value for the fuel oil that oily device 8 sprays with entering internal combustion oil of cylinder) control in the range of 75%~95%.Automatically controlled list
Member 12 is controlled EGR rate in the range of 40-50% by adjusting EGR valve 7, and ECU 12 is according to the row of exhaust gas oxygen sensor 16
Gas oxygen concentration signal judges the dilution situation of in-cylinder combustion, by the increasing for adjusting the electric booster 2 connected with turbocharger
Pressure degree controls in-cylinder mixture strength to be equal to 1 in equivalent proportion；
Step 5: if the judged result of step 1 is high load working condition, ECU 12 reads demarcation MAP, using poly- first
Epoxide dimethyl ether (PODE) evening spray strategy, spray angle is controlled in -5~-20 DEG C of A ATDC scopes, and to the He of air flue fuel injector 8
The output pulse width control signal of polymethoxy dimethyl ether (PODE) direct-injection fuel injector 11 is by ratio (the i.e. air flue oil spout of gas-duct jetting calorific value
The ratio between the gross calorific value of the calorific value for the fuel oil that device 8 sprays with entering internal combustion oil of cylinder) control in the range of 50%~80%；ECU
12 are reduced to EGR rate in the range of 30%-40% by adjusting EGR valve 7, while ECU 12 is according to exhaust gas oxygen sensor 16
Density of oxygen contained in discharged gas signal judge the dilution situation of in-cylinder combustion, the boosting capability of electric booster 2 is improved, by gaseous mixture in cylinder
Concentration control is equal to 1 in equivalent proportion.And the cylinder that ECU 12 is exported according to cylinder pressure sensor 13 presses signal, by control into
Valve evening closes the regulation inlet valve of device 10 evening pass angle, effective compression ratio is reduced, by peak in-cylinder pressure control within limit value.
The limit value of different engines is different, typically in 16MPa.Inlet valve evening closes the method tool for closing angle in the regulation inlet valve evening of device 10
Body may refer to:Hu Wang,Laihui Tong,ZunqingZheng,Mingfa Yao.Experimental Study on
High-loadExtension of Gasoline/PODE Dual-fuel RCCI Operation Using Late
Intake ValveClosing.SAE Paper2017-01-0754,2017. (" Wang Hu, Tong Laihui, Zheng Zunqing, Yao's life hair bases
The experimental study .SAE papers 2017-01- for the big load extensions of gasoline/PODE double fuels RCCI for closing strategy in inlet valve evening
0754,2017.”)。
Embodiment 1
In the present embodiment, using high geometrical compression ratio (18:1) engine, direct in-cylinder fuel is polymethoxy diformazan
Ether (PODE), gas-duct jetting RON octane numbers are 95 commercial gasoline.
Step 1: engine electric-controlled unit 12 is read installed in the tach signal of sensor, peace on engine crankshaft respectively
In gas pedal the position signalling of sensor and according to the signal read judge engine run load；
If Step 2: the judged result of step one is cold start-up and idling operation, using polymethoxy dimethyl ether
(PODE) direct-injection fuel injector 11 carries out 100% polymethoxy dimethyl ether (PODE) in-cylinder direct-jet；
If Step 3: the judged result of step one is small load condition：Rotating speed 1500r/min, load is
0.20MPaIMEP, ECU 12 reads demarcation MAP, and then output control signal gives polymethoxy dimethyl ether (PODE) direct-injection
Fuel injector 11, by the control of polymethoxy dimethyl ether (PODE) spray angle in -40 DEG C of A ATDC scopes, and to air flue fuel injector 8
By gas-duct jetting calorific value ratio, (i.e. air flue sprays with the output pulse width control signal of polymethoxy dimethyl ether (PODE) direct-injection fuel injector 11
The ratio between the gross calorific value of the calorific value for the fuel oil that oily device 8 sprays with entering internal combustion oil of cylinder) control 50%.According to exhaust gas oxygen sensor 16
Density of oxygen contained in discharged gas signal judge the dilution situation of in-cylinder combustion, by adjusting EGR valve 7, to change EGR rate dense by gaseous mixture in cylinder
Degree control is equal to 1 in equivalent proportion；
If Step 4: the judged result of step 1 is moderate duty operating mode：Rotating speed 1500r/min, load is 0.8MPa
IMEP, ECU 12 reads demarcation MAP, and using polymethoxy dimethyl ether (PODE), early spray is tactful, and spray angle is controlled -45
DEG C A ATDC scopes, and believe to air flue fuel injector 8 and the control of the output pulse width of polymethoxy dimethyl ether (PODE) direct-injection fuel injector 11
Number by gas-duct jetting calorific value ratio (i.e. the ratio between the gross calorific value of the calorific value for the fuel oil that air flue fuel injector 8 sprays with entering internal combustion oil of cylinder)
Control is 75%.ECU 12 is controlled EGR rate 40% by adjusting EGR valve 7, and ECU 12 is sensed according to exhaust oxygen
The density of oxygen contained in discharged gas signal of device 16 judges the dilution situation of in-cylinder combustion, by adjusting the electronic supercharging connected with turbocharger
The supercharging level of device 2 controls in-cylinder mixture strength to be equal to 1 in equivalent proportion；
If Step 5: the judged result of step 1 is high load working condition：Rotating speed 1500r/min, load is 1.3MPa
IMEP, ECU 12 reads demarcation MAP, and using polymethoxy dimethyl ether (PODE) evening spray strategy, spray angle is controlled -20
DEG C A ATDC scopes, and believe to air flue fuel injector 8 and the control of the output pulse width of polymethoxy dimethyl ether (PODE) direct-injection fuel injector 11
Number by gas-duct jetting calorific value ratio (i.e. the ratio between the gross calorific value of the calorific value for the fuel oil that air flue fuel injector 8 sprays with entering internal combustion oil of cylinder)
Control is 80%；ECU 12 is controlled EGR rate 40% by adjusting EGR valve 7, while ECU 12 is according to exhaust oxygen
The density of oxygen contained in discharged gas signal of sensor 16 judges the dilution situation of in-cylinder combustion, the boosting capability of electric booster 2 is improved, by cylinder
Interior mixture strength control is equal to 1 in equivalent proportion.And the cylinder that ECU 12 is exported according to cylinder pressure sensor 13 presses signal, leads to
Cross control inlet valve evening pass device 10 and inlet valve evening is closed into angle 25 DEG C of A of postponement, effective compression ratio is reduced, by peak in-cylinder pressure
Control is within 1.6MPa.
,, can be real under different loads using combustion mode design method under the operating mode of the embodiment of the present invention through testing
Existing different gaseous mixture activity and concentration stratification, control burn rate, air inlet pressurization control are coupled in full load mode by EGR
In the range of by control equivalent proportion be equal to 1, using triple-effect catalytic unit can realize high-efficiency cleaning burn.
Embodiment 2
In the present embodiment, using high geometrical compression ratio (18:1) engine, direct in-cylinder fuel is polymethoxy diformazan
Ether (PODE), gas-duct jetting RON octane numbers are 95 commercial gasoline.
Step 1: engine electric-controlled unit 12 is read installed in the tach signal of sensor, peace on engine crankshaft respectively
In gas pedal the position signalling of sensor and according to the signal read judge engine run load；
If Step 2: the judged result of step one is cold start-up and idling operation, using polymethoxy dimethyl ether
(PODE) direct-injection fuel injector 11 carries out 100% polymethoxy dimethyl ether (PODE) in-cylinder direct-jet；
If Step 3: the judged result of step one is small load condition：Rotating speed 1500r/min, load is
0.35MPaIMEP, ECU 12 reads demarcation MAP, and then output control signal gives polymethoxy dimethyl ether (PODE) direct-injection
Fuel injector 11, by the control of polymethoxy dimethyl ether (PODE) spray angle in -30 DEG C of AATDC scopes, and to the He of air flue fuel injector 8
The output pulse width control signal of polymethoxy dimethyl ether (PODE) direct-injection fuel injector 11 is by ratio (the i.e. air flue oil spout of gas-duct jetting calorific value
The ratio between the gross calorific value of the calorific value for the fuel oil that device 8 sprays with entering internal combustion oil of cylinder) control 65%.According to exhaust gas oxygen sensor 16
Density of oxygen contained in discharged gas signal judges the dilution situation of in-cylinder combustion, and EGR rate is changed by in-cylinder mixture strength by adjusting EGR valve 7
Control is equal to 1 in equivalent proportion；
If Step 4: the judged result of step 1 is moderate duty operating mode：Rotating speed 1500r/min, load is 1.0MPa
IMEP, ECU 12 reads demarcation MAP, and using polymethoxy dimethyl ether (PODE), early spray is tactful, and spray angle is controlled -60
DEG C A ATDC scopes, and believe to air flue fuel injector 8 and the control of the output pulse width of polymethoxy dimethyl ether (PODE) direct-injection fuel injector 11
Number by gas-duct jetting calorific value ratio (i.e. the ratio between the gross calorific value of the calorific value for the fuel oil that air flue fuel injector 8 sprays with entering internal combustion oil of cylinder)
Control is 85%.ECU 12 is controlled EGR rate 45% by adjusting EGR valve 7, and ECU 12 is sensed according to exhaust oxygen
The density of oxygen contained in discharged gas signal of device 16 judges the dilution situation of in-cylinder combustion, by adjusting the electronic supercharging connected with turbocharger
The supercharging level of device 2 controls in-cylinder mixture strength to be equal to 1 in equivalent proportion；
If Step 5: the judged result of step 1 is high load working condition：Rotating speed 1500r/min, load is 1.6MPa
IMEP, ECU 12 reads demarcation MAP, and using polymethoxy dimethyl ether (PODE) evening spray strategy, spray angle is controlled -15
DEG C A ATDC scopes, and believe to air flue fuel injector 8 and the control of the output pulse width of polymethoxy dimethyl ether (PODE) direct-injection fuel injector 11
Number by gas-duct jetting calorific value ratio (i.e. the ratio between the gross calorific value of the calorific value for the fuel oil that air flue fuel injector 8 sprays with entering internal combustion oil of cylinder)
Control is 70%；ECU 12 is reduced to 35% by adjusting EGR valve 7 by EGR rate, while ECU 12 is according to exhaust oxygen
The density of oxygen contained in discharged gas signal of sensor 16 judges the dilution situation of in-cylinder combustion, the boosting capability of electric booster 2 is improved, by cylinder
Interior mixture strength control is equal to 1 in equivalent proportion.And the cylinder that ECU 12 is exported according to cylinder pressure sensor 13 presses signal, leads to
Cross control inlet valve evening pass device 10 and IC Intake Valve Closes angle is postponed into 35 DEG C of A, effective compression ratio is reduced, by peak in-cylinder pressure
Control is within 1.6MPa.
,, can be different using combustion mode design method under the operating mode of the embodiment of the present invention through testing through experiment
Different gaseous mixture activity and concentration stratification, control burn rate are realized under load, air inlet pressurization control is coupled complete by EGR
By controlling equivalent proportion to be equal to 1 in the range of load condition, it can realize that high-efficiency cleaning burns using triple-effect catalytic unit.
Embodiment 3
In the present embodiment, using high geometrical compression ratio (18:1) engine, direct in-cylinder fuel is polymethoxy diformazan
Ether (PODE), gas-duct jetting RON octane numbers are 95 commercial gasoline.
Step 1: engine electric-controlled unit 12 is read installed in the tach signal of sensor, peace on engine crankshaft respectively
In gas pedal the position signalling of sensor and according to the signal read judge engine run load；
If Step 2: the judged result of step one is cold start-up and idling operation, using polymethoxy dimethyl ether
(PODE) direct-injection fuel injector 11 carries out 100% polymethoxy dimethyl ether (PODE) in-cylinder direct-jet；
If Step 3: the judged result of step one is small load condition：Rotating speed 1500r/min, load is
0.5MPaIMEP, ECU 12 reads demarcation MAP, and then output control signal is sprayed to polymethoxy dimethyl ether (PODE) direct-injection
Oily device 11, by the control of polymethoxy dimethyl ether (PODE) spray angle in -20 DEG C of AATDC scopes, and to air flue fuel injector 8 and gathers
The output pulse width control signal of methoxyl group dimethyl ether (PODE) direct-injection fuel injector 11 is by gas-duct jetting calorific value ratio (i.e. air flue fuel injector
The ratio between the gross calorific value of the calorific value of the fuel oil of 8 injections with entering internal combustion oil of cylinder) control 70%.According to the row of exhaust gas oxygen sensor 16
Gas oxygen concentration signal judges the dilution situation of in-cylinder combustion, and EGR rate is changed by in-cylinder mixture strength control by adjusting EGR valve 7
System is equal to 1 in equivalent proportion；
If Step 4: the judged result of step 1 is moderate duty operating mode：Rotating speed 1500r/min, load is 1.2MPa
IMEP, ECU 12 reads demarcation MAP, and using polymethoxy dimethyl ether (PODE), early spray is tactful, and spray angle is controlled -90
DEG C A ATDC scopes, and believe to air flue fuel injector 8 and the control of the output pulse width of polymethoxy dimethyl ether (PODE) direct-injection fuel injector 11
Number by gas-duct jetting calorific value ratio (i.e. the ratio between the gross calorific value of the calorific value for the fuel oil that air flue fuel injector 8 sprays with entering internal combustion oil of cylinder)
Control is 95%.ECU 12 is controlled EGR rate 50% by adjusting EGR valve 7, and ECU 12 is sensed according to exhaust oxygen
The density of oxygen contained in discharged gas signal of device 16 judges the dilution situation of in-cylinder combustion, by adjusting the electronic supercharging connected with turbocharger
The supercharging level of device 2 controls in-cylinder mixture strength to be equal to 1 in equivalent proportion；
If Step 5: the judged result of step 1 is high load working condition：Rotating speed 1500r/min, load is 1.8MPa
IMEP, ECU 12 reads demarcation MAP, and using polymethoxy dimethyl ether (PODE) evening spray strategy, spray angle is controlled -5
DEG C A ATDC scopes, and believe to air flue fuel injector 8 and the control of the output pulse width of polymethoxy dimethyl ether (PODE) direct-injection fuel injector 11
Number by gas-duct jetting calorific value ratio (i.e. the ratio between the gross calorific value of the calorific value for the fuel oil that air flue fuel injector 8 sprays with entering internal combustion oil of cylinder)
Control is 50%；ECU 12 is reduced to 30% by adjusting EGR valve 7 by EGR rate, while ECU 12 is according to exhaust oxygen
The density of oxygen contained in discharged gas signal of sensor 16 judges the dilution situation of in-cylinder combustion, the boosting capability of electric booster 2 is improved, by cylinder
Interior mixture strength control is equal to 1 in equivalent proportion.And the cylinder that ECU 12 is exported according to cylinder pressure sensor 13 presses signal, leads to
Cross control inlet valve evening pass device 10 and IC Intake Valve Closes angle is postponed into 55 DEG C of A, effective compression ratio is reduced, by peak in-cylinder pressure
Control is within 1.6MPa.
,, can be real under different loads using combustion mode design method under the operating mode of the embodiment of the present invention through testing
Existing different gaseous mixture activity and concentration stratification, control burn rate, air inlet pressurization control are coupled in full load mode by EGR
In the range of by control equivalent proportion be equal to 1, using triple-effect catalytic unit can realize high-efficiency cleaning burn.
Although invention has been described for above-mentioned combination schematic diagram, the invention is not limited in above-mentioned specific reality
Mode is applied, presented above is only schematic and non-limiting.Those skilled in the art is not taking off under the enlightenment of the present invention
In the case of from present inventive concept, can also carry out various deformation (such as the oxygen-containing class biodiesel of engine in-cylinder direct-jet, gas
Road injection Aalcohols fuel, natural gas etc.), these are belonged within the protection of the present invention.
Claims (2)
1. a kind of equivalent combustion system based on air-fuel mixture enleanment, it is characterised in that：Including being sequentially connected by air intake duct house steward
Turbocharger air compressor, electric booster, air intake heater, air intake intercooler, pressure sensor, temperature sensor, gas
The air inlet of road fuel injector and cylinder, EGR line one end and air intake duct house steward's phase between air intake heater, air intake intercooler
The logical and other end is sequentially connected EGR check valves, electric control EGR valve, EGR charge air coolers and blast pipe and is connected with the exhaust outlet of cylinder
The part connect, described turbocharger air compressor is coaxially connected with exhaust gas turbine；Polymethoxy dimethyl ether direct-injection fuel injector is pacified
In cylinder, blast pipe is sequentially connected exhaust outlet, exhaust gas turbine, exhaust gas oxygen sensor and the triple-effect catalytic unit of cylinder；In vapour
Inlet valve evening pass device is installed on cylinder cap, cylinder pressure sensor is installed in cylinder, ECU output end passes through control line
Device, polymethoxy dimethyl ether direct-injection fuel injector, row are closed with electric booster, electric control EGR valve, air flue fuel injector, inlet valve evening
Gas lambda sensor and cylinder pressure sensor are connected.
2. a kind of control method of the equivalent combustion system based on air-fuel mixture enleanment of use claim 1, comprises the following steps：
Step 1: engine electric-controlled unit reads on engine crankshaft the tach signal of sensor, installed in oil respectively
Door pedal on sensor position signalling and according to the signal read judge engine operation load；
If Step 2: the judged result of step one is cold start-up and idling operation, using the spray of polymethoxy dimethyl ether direct-injection
Oily device carries out 100% polymethoxy dimethyl ether in-cylinder direct-jet；
Step 3: if the judged result of step one is small load condition, ECU reads demarcation MAP, then output control
Signal gives polymethoxy dimethyl ether direct-injection fuel injector, by the control of polymethoxy dimethyl ether spray angle in -20~-40 °C of A ATDC
Scope, and to air flue fuel injector and polymethoxy dimethyl ether direct-injection fuel injector output pulse width control signal by gas-duct jetting calorific value ratio
Example control judges the dilution feelings of in-cylinder combustion according to the density of oxygen contained in discharged gas signal of exhaust gas oxygen sensor in the range of 50%~70%
Condition, controls in-cylinder mixture strength to be equal to 1 in equivalent proportion by adjusting EGR valve change EGR rate；
Step 4: if the judged result of step 1 is moderate duty operating mode, ECU reads demarcation MAP, using polymethoxy
The early spray strategy of dimethyl ether, spray angle is controlled in -45~-90 °C of A ATDC scopes, and to air flue fuel injector and polymethoxy two
Methyl ether direct-injection fuel injector output pulse width control signal controls gas-duct jetting calorific value ratio in the range of 75%~95%, automatically controlled list
Member is controlled EGR rate in the range of 40-50% by adjusting EGR valve, and ECU is dense according to the exhaust oxygen of exhaust gas oxygen sensor
Degree signal judges the dilution situation of in-cylinder combustion, and the supercharging level of the electric booster connected by adjustment with turbocharger is by cylinder
Interior mixture strength control is equal to 1 in equivalent proportion；
Step 5: if the judged result of step 1 is high load working condition, ECU reads demarcation MAP, using polymethoxy two
Methyl ether evening spray strategy, spray angle is controlled in -5~-20 °C of A ATDC scopes, and to air flue fuel injector and polymethoxy dimethyl ether
Direct-injection fuel injector output pulse width control signal controls gas-duct jetting calorific value ratio in the range of 50%~80%；ECU leads to
Overregulate EGR valve EGR rate is reduced in the range of 30%-40%, while exhaust oxygen of the ECU according to exhaust gas oxygen sensor
Concentration signal judges the dilution situation of in-cylinder combustion, the boosting capability of electric booster is improved, by in-cylinder mixture strength control
It is equal to 1 in equivalent proportion, and the cylinder that ECU is exported according to cylinder pressure sensor presses signal, by controlling inlet valve evening to close device
Inlet valve evening pass angle is adjusted, effective compression ratio is reduced, by peak in-cylinder pressure control within limit value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710367727.7A CN107061064B (en) | 2017-05-23 | 2017-05-23 | A kind of equivalent combustion system and its control method based on air-fuel mixture enleanment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710367727.7A CN107061064B (en) | 2017-05-23 | 2017-05-23 | A kind of equivalent combustion system and its control method based on air-fuel mixture enleanment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107061064A true CN107061064A (en) | 2017-08-18 |
| CN107061064B CN107061064B (en) | 2019-07-26 |
Family
ID=59610502
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710367727.7A Active CN107061064B (en) | 2017-05-23 | 2017-05-23 | A kind of equivalent combustion system and its control method based on air-fuel mixture enleanment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107061064B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109538347A (en) * | 2018-09-30 | 2019-03-29 | 天津大学 | It is able to achieve the control system and method for full working scope range gasoline high-efficiency cleaning compression ignition |
| CN109779770A (en) * | 2017-11-15 | 2019-05-21 | 丰田自动车株式会社 | EGR control device |
| CN110821722A (en) * | 2019-11-22 | 2020-02-21 | 江苏大学 | Intake charge heating device of diesel/alcohol binary fuel engine and control method |
| CN112664361A (en) * | 2020-12-24 | 2021-04-16 | 天津大学 | Stratified injection recirculating exhaust system device for clean combustion of internal combustion engine |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080216557A1 (en) * | 2007-03-06 | 2008-09-11 | Gm Global Technology Operations, Inc. | Method and apparatus for estimating exhaust temperature of an internal combustion engine |
| CN101975118A (en) * | 2010-11-18 | 2011-02-16 | 天津大学 | Method and device for controlling emission of passenger car engine based on double jetting of fuels in cylinder |
| JP2015075004A (en) * | 2013-10-07 | 2015-04-20 | トヨタ自動車株式会社 | Control device for internal combustion engine |
| US20150315986A1 (en) * | 2012-11-30 | 2015-11-05 | Isuzu Motors Limited | Natural gas engine and operation method for natural gas engine |
| US20170030275A1 (en) * | 2015-07-29 | 2017-02-02 | Honda Motor Co., Ltd. | Method and apparatus for controlling internal-combustion engine |
-
2017
- 2017-05-23 CN CN201710367727.7A patent/CN107061064B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080216557A1 (en) * | 2007-03-06 | 2008-09-11 | Gm Global Technology Operations, Inc. | Method and apparatus for estimating exhaust temperature of an internal combustion engine |
| CN101622437A (en) * | 2007-03-06 | 2010-01-06 | 通用汽车环球科技运作公司 | Method and apparatus for estimating exhaust temperature of an internal combustion engine |
| CN101975118A (en) * | 2010-11-18 | 2011-02-16 | 天津大学 | Method and device for controlling emission of passenger car engine based on double jetting of fuels in cylinder |
| US20150315986A1 (en) * | 2012-11-30 | 2015-11-05 | Isuzu Motors Limited | Natural gas engine and operation method for natural gas engine |
| JP2015075004A (en) * | 2013-10-07 | 2015-04-20 | トヨタ自動車株式会社 | Control device for internal combustion engine |
| US20170030275A1 (en) * | 2015-07-29 | 2017-02-02 | Honda Motor Co., Ltd. | Method and apparatus for controlling internal-combustion engine |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109779770A (en) * | 2017-11-15 | 2019-05-21 | 丰田自动车株式会社 | EGR control device |
| CN109779770B (en) * | 2017-11-15 | 2021-08-31 | 丰田自动车株式会社 | EGR control device |
| CN109538347A (en) * | 2018-09-30 | 2019-03-29 | 天津大学 | It is able to achieve the control system and method for full working scope range gasoline high-efficiency cleaning compression ignition |
| CN109538347B (en) * | 2018-09-30 | 2021-12-14 | 天津大学 | Control method capable of realizing efficient clean compression ignition of gasoline in full working condition range |
| CN110821722A (en) * | 2019-11-22 | 2020-02-21 | 江苏大学 | Intake charge heating device of diesel/alcohol binary fuel engine and control method |
| CN110821722B (en) * | 2019-11-22 | 2023-11-10 | 江苏大学 | Air inlet charge heating device of diesel/alcohol binary fuel engine and control method |
| CN112664361A (en) * | 2020-12-24 | 2021-04-16 | 天津大学 | Stratified injection recirculating exhaust system device for clean combustion of internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107061064B (en) | 2019-07-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6907157B2 (en) | Internal combustion engine that is internally cooled and its method | |
| US8555852B2 (en) | Gaseous-fuelled stoichiometric compression ignition internal combustion engine | |
| US8977469B2 (en) | Multi-fuel control system and method | |
| CN104995392B (en) | The fuel injection strategy of middle of cycle | |
| US9228506B2 (en) | Multi-fuel control system and method | |
| CN102859152B (en) | Control the method for explosive motor | |
| CN109538347B (en) | Control method capable of realizing efficient clean compression ignition of gasoline in full working condition range | |
| CN101907025A (en) | Multi-fuel combustion system of internal combustion machine | |
| CN101215996A (en) | Fuel on-site mixing and compressed ignition internal combustion engine and control method | |
| CN107061064B (en) | A kind of equivalent combustion system and its control method based on air-fuel mixture enleanment | |
| CN111379634B (en) | Lean-burn engine and automobile | |
| CN111472891A (en) | Diesel ignition natural gas engine combustion system and control method thereof | |
| CN102226426A (en) | Dual-fuel composite homogenous charge compression ignition combustion system based on activation heat atmosphere | |
| WO2023274184A1 (en) | Dual-fuel intelligent combustion system and control method therefor | |
| CN209398491U (en) | A kind of control system that can effectively expand gasoline compression ignition high-efficiency cleaning range of operation | |
| CN1580531A (en) | Double-fuel homogeneous compression ignition/quasi-homogeneous compression compound combustion system | |
| CN114017178B (en) | Lean combustion control method and device and hydrogen engine system | |
| CN115596561A (en) | Injection control method and combustion system of diesel ignition high-pressure liquid ammonia direct injection internal combustion engine | |
| CN109838319A (en) | A kind of control method of combustion system of engine and combustion system of engine | |
| JP6398543B2 (en) | Natural gas engine and method of operating natural gas engine | |
| CN114017179A (en) | Lean combustion system and method | |
| CN110107418A (en) | Double fuel bump combustion chamber system | |
| Liu et al. | Effects of diesel/ethanol dual fuel on emission characteristics in a heavy-duty diesel engine | |
| Gürbüz et al. | Modeling of post-injection strategies of ethanol and experimental analysis of the use of ethanol in the form of dual fuel and emulsion in diesel engine | |
| US20140311837A1 (en) | Safety brake system for trailers |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |