CN106677886B - A kind of progress control method of the direct compression-ignition engine of gasoline - Google Patents

A kind of progress control method of the direct compression-ignition engine of gasoline Download PDF

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Publication number
CN106677886B
CN106677886B CN201710012722.2A CN201710012722A CN106677886B CN 106677886 B CN106677886 B CN 106677886B CN 201710012722 A CN201710012722 A CN 201710012722A CN 106677886 B CN106677886 B CN 106677886B
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valve
air inlet
gasoline
egr
pipe
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CN106677886A (en
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刘海峰
马俊生
马桂香
尧命发
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Tianjin University
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Tianjin University
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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
    • F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
    • F02B29/04—Cooling of air intake supply
    • F02B29/0406—Layout of the intake air cooling or coolant circuit
    • F02B29/0418—Layout of the intake air cooling or coolant circuit the intake air cooler having a bypass or multiple flow paths within the heat exchanger to vary the effective heat transfer surface
    • 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
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
    • F02B23/04—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being subdivided into two or more chambers
    • 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
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
    • F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
    • F02B23/0672—Omega-piston bowl, i.e. the combustion space having a central projection pointing towards the cylinder head and the surrounding wall being inclined towards the cylinder center axis
    • 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
    • F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
    • F02B29/04—Cooling of air intake supply
    • F02B29/0493—Controlling the air charge temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
    • F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
    • F02D13/0261—Controlling the valve overlap
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
    • F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
    • F02D13/0276—Actuation of an additional valve for a special application, e.g. for decompression, exhaust gas recirculation or cylinder scavenging
    • 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
    • F02D41/0002—Controlling intake air
    • F02D41/0007—Controlling intake air for control of turbo-charged or super-charged engines
    • 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
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/0047—Controlling exhaust gas recirculation [EGR]
    • F02D41/005—Controlling exhaust gas recirculation [EGR] according to engine operating conditions
    • 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
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/0047—Controlling exhaust gas recirculation [EGR]
    • F02D41/006—Controlling exhaust gas recirculation [EGR] using internal EGR
    • 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
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/0047—Controlling exhaust gas recirculation [EGR]
    • F02D41/0077—Control of the EGR valve or actuator, e.g. duty cycle, closed loop control of position
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
    • F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
    • F02D41/064—Introducing corrections for particular operating conditions for engine starting or warming up for starting at cold start
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/26—Pistons  having combustion chamber in piston head
    • 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
    • F02M31/00—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture
    • F02M31/02—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating
    • F02M31/12—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating electrically
    • F02M31/13—Combustion air
    • 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
    • F02D41/0002—Controlling intake air
    • F02D2041/001—Controlling intake air for engines with variable valve actuation
    • 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
    • Y02T10/40—Engine management systems

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Abstract

The invention discloses a kind of running gears of the direct compression-ignition engine of gasoline, cylinder is provided with glow plug, one section of air inlet bypass pipe has been bypassed in the air inlet pipe by intercooler, the flow direction of pipeline is controlled by an air intake control valve, ECU judges the load of engine operation according to reading revolving speed and throttle position signal, when cold start, control glow plug is cooling without intercooler to gaseous mixture heating, the compressed air of control high temperature in cylinder；When Smaller load, solve the problems, such as gasoline compression-ignition engine in small load condition lower part divided combustion by the way of negative valve overlap；When moderate duty, realize that the high-efficiency cleaning of gasoline compression-ignition engine burns using inside and outside EGR Collaborative Control；When high load capacity, using small internal EGR, big external EGR, to inhibit the maximum pressure rate of rise in cylinder.High-efficiency cleaning burning of the gasoline compression-ignition engine in wide loading range may be implemented in the present invention.Lower nitrogen oxides and soot emissions are kept while improving fuel consumption rate.

Description

A kind of progress control method of the direct compression-ignition engine of gasoline
Technical field
The present invention relates to technical field of internal combustion engines, running gear more particularly to a kind of direct compression-ignition engine of gasoline and Control method.
Background technique
With technology of gasoline engine development and emission regulation it is increasingly strict, existing technology of gasoline engine is proposed more Stern challenge.Current relatively advanced technology, such as the layering Lean burn engine and in-cylinder direct-jet of gasoline engine, and it is useless Gas recycling, exhaust fume catalytic conversion etc., are all difficult to meet the requirement of new legislation.
In recent years, it to realize that technology of gasoline engine obtains new breakthrough in terms of performance and discharge, actively grinds both at home and abroad Study carefully a kind of gasoline compression ignition technology.Homogeneous charge compression ignition combustion (HCCI), the burning of high homogeneous charge compression ignition (HPCI), partial pre-mix The multiple technologies such as compression ignition combustion (PPCI) belong to the scope of gasoline compression ignition technology.
Gasoline compression ignition is different from the combustion process of traditional gasoline engine, right also different from traditional diesel engine combustion It is because of ignition temperature height, oxygen-enriched two factors, using gasoline pressure in the main reason for spark ignition type gasoline engine, nitrogen oxides generation After combustion, although mixture strength is thinning, due to the feature of Multi-point combustion, ignition temperature is reduced, therefore can effectively reduce nitrogen Emissions of oxides.Furthermore high compression ratio can be used in gasoline compression ignition technology, to improve the thermal efficiency of engine, improves combustion Oily economy.
Although gasoline compression ignition technology can be improved gasoline engine performance, reduce discharge, gasoline compression ignition technology application there are still Following difficult point, first, kindling is difficult when cold start.The initiation temperature of gasoline engine compression ignition technology burning is substantially on the left side 1000K The right side, when cold start, combustion chamber wall surface temperature is low, cannot absorb heat from inlet manifold, be also without available high-temp waste gas It is relatively difficult that high-temperature gas mixture is obtained in combustion chamber, it is not easy to gaseous mixture be made to realize compression autoignition.It is therefore, if not temperature compensated, To realize that compression ignition is extremely difficult in cold-start phase.Second, operating condition is limited.Gasoline compression-ignition engine is under small load condition Due to lean burn, it is easy to happen part burning；Under high load working condition, gaseous mixture overrich burns very fast, easily occurs Pinking.Therefore gasoline compression ignition technology can only operate in middle small load condition at present.Third, the ignition timing of gasoline compression ignition and burning Rate is difficult to control.The ignition process of gasoline compression ignition is mainly controlled by Chemical Kinetics, and ignition timing depends on gaseous mixture Ingredient, temperature and pressure, if gasoline compression-ignition engine Combustion System is preferable, gasoline engine can be in wider big air-fuel ratio model The interior burning for carrying out efficient stable is enclosed, circular wave is small, works soft.If gasoline compression-ignition engine burning tissues is bad, It is then easy to appear pinking or catches fire, the anti-interior variation of the performance of engine.
Summary of the invention
It is an object of the invention to overcome the shortcomings of prior art, a kind of operation dress of direct compression-ignition engine of gasoline is provided It sets and control method solves the problems, such as starting difficulty in cold start；In small load condition, solve the problems, such as partially combusted；? High load working condition solves the problems, such as pinking.
In order to solve the above-mentioned technical problem, the control of the running gear of the direct compression-ignition engine of a kind of gasoline proposed by the present invention The running gear of method processed, the direct compression-ignition engine of gasoline being related to includes cylinder, and piston, institute are equipped in the cylinder It states and intake and exhaust valves is installed on the cylinder cap of cylinder, surrounded and formed by cylinder cap, inlet valve, exhaust valve, piston and cylinder jacket Cavity be combustion chamber, air inlet is passed through combustion chamber by air inlet pipe, and exhaust is discharged out of combustion chamber by exhaust pipe；The air inlet pipe End is equipped with glow plug and gasoline ejector, and the petrol injector and glow plug are located at side by side below cylinder cap, it is described into Compressor and intercooler are installed along airintake direction on tracheae, the exhaust pipe is equipped with coaxially connected with the compressor Turbine；A both ends air inlet bypass pipe in parallel with the intercooler in air inlet pipe, positioned at the intercooler, by the air inlet The intersection of the inlet end of siphunculus and the air inlet pipe is equipped with air intake control valve, and the air intake control valve is three-way valve；It is described into Gas control valve is connected with ECU, and the ECU controls the air intake control valve, to realize that air inlet is entered by the intercooler Combustion chamber still passes through pipe by air inlet and enters the combustion chamber；The exhaust end of the inlet end of the air inlet pipe and the exhaust pipe it Between be connected with external EGR circulation pipe, the external EGR circulation pipe is equipped with external EGR valve；The external EGR valve and ECU phase Even；Exhaust drives the rotating turbine through the exhaust pipe, and portion discharge flows to the air inlet pipe through external EGR circulation pipe, The ECU controls the opening size of the external EGR valve；The control method is to control intake and exhaust valves, step using VVT It is as follows:
It is mounted on the tach signal of sensor on engine crankshaft Step 1: ECU is read respectively, is mounted in gas pedal The position signal of sensor and the operating condition that engine operation is judged according to read signal；
Step 2: ECU control air intake control valve is opened to air inlet bypass pipe, so that the compressed air of high temperature when cold start Cooling without intercooler, ECU controls glow plug and heats to the indoor gaseous mixture that burns；In non-cold-mix asphalt mixture, glow plug It does not work；
Step 3: having one of following several situations according to the result that step 1 judges:
If it is judged that being small load condition, then ECU controls air intake control valve and is opened to air inlet bypass pipe, and uses and do something in a fit of pique The mode of the folded angle of release of door is closed at this point, ECU controls external EGR valve；Gasoline compression-ignition engine is solved small negative using internal EGR The problem of lotus operating condition lower part divided combustion；
If it is judged that being moderate duty operating condition, then ECU controls air intake control valve and is opened to intercooler, makes cold in air inlet warp Device flows to combustion chamber；And using internal EGR and outside EGR Collaborative Control, internal EGR, ECU are realized by negative valve overlap The aperture for controlling external EGR valve realizes external EGR, guarantees gasoline compression-ignition engine near using internal EGR Reach compression ignition temperature, external EGR inhibits maximum pressure rate of rise；With the increase of load, operating ambient temperature is gradually risen in cylinder Height reduces internal EGR and heats to gaseous mixture, increases external EGR, the maximum pressure rate of rise inhibited in cylinder is realized, to realize The high-efficiency cleaning of gasoline compression-ignition engine burns；
If it is judged that being high load capacity operating condition, ECU control air intake control valve is opened to intercooler, so that air inlet is through intercooler Combustion chamber is flowed to, using internal EGR as small as possible, big external EGR；And angle of release is folded using big positive valve, in reducing Portion EGR；With the increase of load, using external EGR to inhibit maximum pressure rate of rise in cylinder.
Compared with prior art, the beneficial effects of the present invention are:
(1) it is provided with air inlet bypass pipe in running gear of the invention, by air intake control valve control air inlet trend.So that into Gas is cooling without intercooler under cold start and small load condition, keeps air inlet higher temperature after compressor, favorably Reach its compression ignition temperature in gaseous mixture.
(2) inlet valve, exhaust valve are controlled using VVT, realizes the reasonable internal EGR under different operating conditions.
(3) Collaborative Control of internal EGR and outside EGR solves gasoline compression-ignition engine and is met in actual application To the problem of.
(4) design of combustion chamber realizes better scavenging period, higher compression ratio, more favorable hierarchical control, more Small surface to volume ratio.
Detailed description of the invention
Fig. 1 is a kind of running gear schematic diagram of direct compression-ignition engine of gasoline.
Fig. 2 is a kind of chamber structure schematic diagram of direct compression-ignition engine of gasoline.
Fig. 3 is a kind of control principle drawing of direct compression-ignition engine control method of gasoline.
Fig. 4 is the direct compression-ignition engine of gasoline under different operating conditions, and inlet valve, exhaust valve are opened and closed time chart.
In figure: 1- air inlet pipe, 2- compressor, 3- air intake control valve, 4- intercooler, 5- gasoline ejector, 6- glow plug, 7- Inlet valve, the combustion chamber 8-, 9- exhaust valve, 10- air inlet bypass pipe, 11- exhaust pipe, 12- turbine, EGR valve outside 13-, outside 14- Portion's EGR circulation pipe, 15- cylinder, 81- cylinder cap, 82- piston, 83- bore, 84- cheat deep, 85- pit.
Specific embodiment
Technical solution of the present invention is described in further detail in the following with reference to the drawings and specific embodiments, it is described specific Embodiment is only explained the present invention, is not intended to limit the invention.
As shown in Figure 1, a kind of running gear for the direct compression-ignition engine of gasoline being related in the present invention, including cylinder 15, the cylinder 15 is interior to be equipped with piston 82, inlet valve 7 and exhaust valve 9 is equipped on the cylinder cap 81 of the cylinder 15, by cylinder cap 81, it is combustion chamber 8 that inlet valve 7, exhaust valve 9, piston 82 and cylinder jacket, which surround the cavity to be formed, and air inlet is passed through combustion by air inlet pipe 1 Room 8 is burnt, exhaust is discharged out of combustion chamber 8 by exhaust pipe 11；The end of the air inlet pipe 1 is equipped with glow plug 6 and gasoline oil spout Device 5, the glow plug 6 is for heating air inlet, and the petrol injector 5 is located at 81 lower section of cylinder cap with glow plug 6 side by side, in institute It states and compressor 2 and intercooler 4 is installed along airintake direction in air inlet pipe 1, in air inlet pipe 1, positioned at the two of the intercooler 4 Hold air inlet bypass pipe 10 in parallel with the intercooler 4, the inlet end of the air inlet bypass pipe 10 and crossing for the air inlet pipe 1 Place is equipped with air intake control valve 3, and the air intake control valve 3 is three-way valve；The air intake control valve 3 is connected with ECU, the ECU control The air intake control valve 3 is made, to realize that air inlet is to enter combustion chamber 8 by the intercooler 4 or by pipe 10 by air inlet Into the combustion chamber 8；The exhaust pipe 11 is equipped with the turbine 12 coaxially connected with the compressor 2；The air inlet pipe 1 Inlet end and the exhaust pipe 11 exhaust end between be connected with external EGR circulation pipe 14, the external EGR circulation pipe 14 It is equipped with external EGR valve 13；The external EGR valve 13 is connected with ECU；Exhaust drives the turbine through the exhaust pipe 11 12 rotations, portion discharge flow to the air inlet pipe 1 through external EGR circulation pipe 14, and the ECU controls the external EGR valve 13 Opening size.
In the present invention, the structure of combustion chamber 8 be using shallow Peng Ding, small ω shape bottom cavity structure form, as shown in Fig. 2, The cylinder cap 81 is shallow fluffy top shape cylinder cap, is machined with a shallow pit 85, the piston 82 in the central position of cylinder cap 81 For the wide diameter piston of shallow hole, the top of the piston 82 is wide aperture 83, shallow hole deeply 84, axial section is in the top land of ω shape. The shallow wide diameter piston of pit 85 and shallow hole of the central location for the cylinder cap 81 emphasized in the present invention is pair with conventional engines Than pit on cylinder cap is more shallow, top land bore is wider and more shallow.
In the present invention, the design of shallow fluffy top shape cylinder cap 81 can get compared with the completely flat cylinder cap design of conventional diesel engine Higher surface area is more advantageous to improvement scavenging period so as to increase the diameter of valve；Shallow fluffy top shape cylinder cap 81 is set Meter is compared with conventional gasoline machine, the deep pit 85 not as conventional gasoline machine, to reduce the volume of combustion chamber 8, improves The compression ratio of engine；The wide diameter piston 82 of shallow hole has broader bore 83, more shallow hole compared with conventional diesel combustion room Deep 84, so that flowing is weaker, is conducive to gasoline compression ignition and controls burning by being layered；Shallow fluffy top shape cylinder cap 81 and conventional gasoline machine It compares, there is more shallow pit 85, surface to volume ratio reduces, and the wide diameter piston 82 of shallow hole has broader mouth compared with conventional diesel engine Diameter 83, more shallow hole deep 84, surface to volume ratio reduces, and reduces surface to volume ratio by shallow fluffy top shape cylinder cap 81, the wide diameter piston 82 of shallow hole, thus Heat transfer loss is advantageously reduced, achievees the purpose that fuel-economizing.
Fig. 3 shows the control principle of the control method of the running gear of the direct compression-ignition engine of gasoline of the present invention, and ECU divides The position signal and root that the tach signal of sensor on engine crankshaft Du Qu be mounted on, be mounted on sensor in gas pedal According to read signal judge engine operation load, ECU judgement where operating condition, determine air intake control valve 3 be opened to And the opening size of external EGR valve 13, and utilize VVT control inlet valve 7 and exhaust valve 9；Operating condition where being determined by ECU, And control method under corresponding operating condition is taken, realize high-efficiency cleaning burning of the gasoline compression-ignition engine in wide loading range.? While improving fuel consumption rate, and keep lower nitrogen oxides and soot emissions.Specific step is as follows:
It is mounted on the tach signal of sensor on engine crankshaft Step 1: ECU is read respectively, is mounted in gas pedal The position signal of sensor and the operating condition that engine operation is judged according to read signal；
Step 2: ECU control air intake control valve 3 is opened to air inlet bypass pipe 10, so that the compression of high temperature is empty when cold start Gas is cooling without intercooler 4, and ECU control glow plug 6 heats the gaseous mixture in combustion chamber 8, by bypass air inlet and mixes Gas heating is closed, gaseous mixture is more advantageous to and reaches compression ignition temperature in cylinder compression top dead centre in entrance combustion chamber 8.In non-cold start Operating condition, glow plug 6 do not work；
Step 3: having one of following three kinds of situations according to the result that step 1 judges:
If it is judged that being small load condition, then ECU controls air intake control valve 3 and is opened to air inlet bypass pipe 10, so that high Warm compressed air is cooling without intercooler.Due to being unable to reach compression ignition temperature near under small load condition, Gaseous mixture need to be heated using internal EGR, stay in more exhaust gas inside cylinders by the way of negative valve overlap at this time In cylinder (in combustion chamber 8), i.e., exhaust valve is closed in advance before the top dead centre of instroke, and inlet valve suction stroke piston from It just opens, is early closed by exhaust valve, inlet valve evening opens and realizes that more exhaust gas inside cylinders stay when the certain crank angle of top dead centre downlink Gaseous mixture is heated in cylinder；ECU controls external EGR valve and closes at this time.Gasoline compression-ignition engine is solved using internal EGR In small load condition lower part the problem of divided combustion.
If it is judged that being moderate duty operating condition, then ECU controls air intake control valve 3 and is opened to intercooler 4, makes in air inlet warp Cooler 4 flows in cylinder i.e. combustion chamber 8；Using internal EGR and outside EGR Collaborative Control, by the realization of negative valve overlap The aperture that portion EGR, ECU control external EGR valve 13 realizes external EGR, guarantees that gasoline compression-ignition engine is compressing using internal EGR Near top dead center reaches compression ignition temperature, and external EGR inhibits maximum pressure rate of rise.With the increase of load, working environment in cylinder Temperature gradually rises, and reduces internal EGR and heats to gaseous mixture, increases external EGR, realizes and the maximum pressure in cylinder is inhibited to increase Rate realizes the high-efficiency cleaning burning of gasoline compression-ignition engine using the Collaborative Control of internal EGR and outside EGR.
If it is judged that being high load capacity operating condition, then ECU controls air intake control valve and is opened to intercooler, so that cold in air inlet warp Device flows in cylinder.Under high load capacity operating condition, easily there is pinking in gasoline compression-ignition engine, and big load does not need internal EGR, still Internal EGR can not have in engine combustion process, therefore use internal EGR as small as possible, and as big as possible is outer Portion EGR can use external EGR valve standard-sized sheet to obtain external EGR as big as possible.With the increase of load, it is not necessarily to internal EGR Gaseous mixture is heated, and the internal EGR of high temperature more readily promotes the generation of pinking, so not using angrily door in high load working condition It folds angle of release and angle of release is folded using big positive valve, is i.e. exhaust valve is slowly transitioned into late pass by original early close, and inlet valve is by original The evening come changes down to be transitioned into slowly and early open, to reduce internal EGR.With the increase of load, inhibited using external EGR maximum in cylinder The rate of pressure rise.
Fig. 4 is valve opening and closing time chart of the direct compression-ignition engine of gasoline under different operating conditions.In Smaller load, wish at this time Internal EGR as big as possible heats gaseous mixture, is conducive to gaseous mixture near compression ignition, therefore uses negative valve overlap Mode stay in portion in cylinder, i.e., exhaust valve is closed before instroke top dead centre, and inlet valve is in suction stroke piston The crank angle certain from top dead centre downlink is just opened；It is gradually decreased in the demand of moderate duty, internal EGR, compared with small Load, negative valve overlap are gradually reduced；In big load, it is desirable to internal EGR as small as possible, because under high load working condition, Gasoline compression-ignition engine is easy to produce pinking, and with the increase of load, negative valve overlap is gradually reduced, and gradually to positive valve Folded angle of release transition, and positive valve is folded angle of release and is increased with the increase of load.
Although above in conjunction with attached drawing, invention has been described, and the invention is not limited to above-mentioned specific implementations Mode, the above mentioned embodiment is only schematical, rather than restrictive, and those skilled in the art are at this Under the enlightenment of invention, without deviating from the spirit of the invention, many variations can also be made, these belong to of the invention Within protection.

Claims (1)

1. a kind of progress control method of the direct compression-ignition engine of gasoline, the operation of the direct compression-ignition engine of involved gasoline Device includes cylinder (15), is equipped with piston (82) in the cylinder (15), be equipped on the cylinder cap (81) of the cylinder (15) into Valve (7) and exhaust valve (9) are surrounded by cylinder cap (81), inlet valve (7), exhaust valve (9), piston (82) and cylinder jacket and to be formed Cavity is combustion chamber (8), and air inlet is passed through combustion chamber (8) by air inlet pipe (1), exhaust row out of combustion chamber (8) by exhaust pipe (11) Out；The end of the air inlet pipe (1) is equipped with glow plug (6) and gasoline ejector (5), the petrol injector (5) and electric heating It fills in (6) to be located at below cylinder cap (81) side by side, compressor (2) He Zhongleng is installed along airintake direction on the air inlet pipe (1) Device (4), the exhaust pipe (11) are equipped with the turbine (12) coaxially connected with the compressor (2)；On air inlet pipe (1), Positioned at the both ends of the intercooler (4) air inlet bypass pipe (10) in parallel with the intercooler (4), the air inlet bypass pipe (10) Inlet end and the air inlet pipe (1) intersection be equipped with air intake control valve (3), the air intake control valve (3) be three-way valve；Institute It states air intake control valve (3) to be connected with ECU, the ECU controls the air intake control valve (3), to realize that air inlet is by described Intercooler (4) enters combustion chamber (8) or enters the combustion chamber (8) by pipe (10) by air inlet；The air inlet pipe (1) into External EGR circulation pipe (14), the external EGR circulation pipe (14) are connected between gas end and the exhaust end of the exhaust pipe (11) It is equipped with external EGR valve (13)；The external EGR valve (13) is connected with ECU；Exhaust drives the whirlpool through the exhaust pipe (11) Turbine (12) rotation, portion discharge flow to the air inlet pipe (1) through external EGR circulation pipe (14), and the ECU controls the outside The opening size of EGR valve (13)；
It is characterized in that, utilizing VVT control inlet valve (7) and exhaust valve (9)；And the following steps are included:
It is mounted on the tach signal of sensor on engine crankshaft, is mounted in gas pedal and senses Step 1: ECU is read respectively The position signal of device and the operating condition that engine operation is judged according to read signal；
Step 2: when cold start, ECU control air intake control valve (3) is opened to air inlet bypass pipe (10), so that the compression of high temperature is empty Gas is cooling without intercooler (4), and the gaseous mixture in combustion chamber (8) is heated in ECU control glow plug (6)；In non-cold start Operating condition, glow plug (6) do not work；
Step 3: having one of following several situations according to the result that step 1 judges:
If it is judged that being small load condition, then ECU controls air intake control valve (3) and is opened to air inlet bypass pipe (10), and uses The mode of negative valve overlap is closed at this point, ECU controls external EGR valve (13)；Gasoline compression ignition is solved using internal EGR to start Machine is the divided combustion of small load condition lower part the problem of；
If it is judged that being moderate duty operating condition, then ECU controls air intake control valve (3) and is opened to intercooler (4), makes in air inlet warp Cooler (4) flows to combustion chamber (8)；And using internal EGR and outside EGR Collaborative Control, realized by negative valve overlap internal The aperture that EGR, ECU control external EGR valve (13) realizes external EGR, guarantees that gasoline compression-ignition engine is compressing using internal EGR Near top dead center reaches compression ignition temperature, and external EGR inhibits maximum pressure rate of rise；With the increase of load, working environment in cylinder Temperature gradually rises, and reduces internal EGR and heats to gaseous mixture, increases external EGR, realizes and the maximum pressure in cylinder is inhibited to increase Rate, to realize the high-efficiency cleaning burning of gasoline compression-ignition engine；
If it is judged that being high load capacity operating condition, ECU control air intake control valve (3) is opened to intercooler (4), so that cold in air inlet warp Device (4) flows to combustion chamber (8), using internal EGR as small as possible, big external EGR；And angle of release is folded using big positive valve, To reduce internal EGR；With the increase of load, using external EGR to inhibit maximum pressure rate of rise in cylinder.
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