CN109838319A - A kind of control method of combustion system of engine and combustion system of engine - Google Patents
A kind of control method of combustion system of engine and combustion system of engine Download PDFInfo
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- CN109838319A CN109838319A CN201711228202.1A CN201711228202A CN109838319A CN 109838319 A CN109838319 A CN 109838319A CN 201711228202 A CN201711228202 A CN 201711228202A CN 109838319 A CN109838319 A CN 109838319A
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Abstract
The invention discloses the control method of a kind of combustion system of engine and combustion system of engine, which includes: engine body, air inlet system and exhaust system, gasoline air flue spraying system, ethyl alcohol in-cylinder direct-jet system, ignition system, variable valve system, gas recirculation system and electronic control unit；Engine body is connected with air inlet system and exhaust system, ethyl alcohol in-cylinder direct-jet system, ignition system and variable valve system, air inlet system and exhaust system are connected with gasoline air flue spraying system and gas recirculation system, gasoline air flue spraying system, ethyl alcohol in-cylinder direct-jet system, ignition system, variable valve system and gas recirculation system are connected with electronic control unit, and engine body uses high geometrical compression ratio.As it can be seen that realizing gasoline and ethyl alcohol double fuel compound combustion by corresponding combustion mode, inhibits the pre-ignition and pinking tendency in high load working condition region, improve the low speed torque and power density of engine, improve efficiency of combustion and the thermal efficiency.
Description
Technical field
The present invention relates to technical field of engines more particularly to a kind of combustion system of engine and combustion system of engine
Control method.
Background technique
With getting worse for global environment and ecological problem, emission regulation and fuel oil warp of the countries in the world for engine
Ji property standard is increasingly stringent.In recent years, engine with supercharger technology and gasoline in-cylinder direct-jet technology are widely used in vehicle engine
Machine, wherein engine with supercharger technology can be obviously improved the power density of engine, improve the performance and fuel oil warp of internal combustion engine
Ji property；Gasoline in-cylinder direct-jet technology can reduce hot atmosphere by direct-injection fuel evaporation heat absorption, improve volumetric efficiency, effectively inhibit
Pinking or pre-ignition tendency, allow to improve the fuel economy of engine using higher compression ratio.In addition, engine with supercharger skill
Art and gasoline in-cylinder direct-jet technology, which combine, can significantly improve the dynamic response of engine, therefore, supercharged direct-injection engine
Mainstream as current development of engine.
But inventor has found that for common engine, due to pressurization direct-injection in the prior art
The reinforcing degree of engine is higher, and peak combustion pressure and temperature can increase in cylinder, causes supercharged direct-injection engine negative greatly
There is phenomenon of detonation in lotus conditioned area, especially easily causes pre-ignition and super detonation phenomenon in low speed and heavy load conditioned area,
Even if by postpone igniting, enriching, exhaust gas recycling (English: Exhaust Gas Recirculation, abridge: EGR) etc. this
A little conventional technical means inhibit the effect of above-mentioned phenomenon limited, and supercharged direct-injection engine easily draws in low speed and heavy load conditioned area
Sending out pre-ignition and super detonation phenomenon becomes the biggest obstacle that limitation engine power density and low speed torque are promoted.
Summary of the invention
The technical problem to be solved by the invention is to provide the controls of a kind of combustion system of engine and combustion system of engine
Method processed inhibits the pre-ignition and pinking tendency in high load working condition region, improves the low speed torque and power density of engine, improve
Efficiency of combustion and the thermal efficiency.
In a first aspect, the embodiment of the invention provides a kind of combustion system of engine, which includes:
Engine body, gasoline air flue spraying system, ethyl alcohol in-cylinder direct-jet system, ignition system, can be changed air inlet system and exhaust system
Valve system, gas recirculation system and electronic control unit；The engine body and the air inlet system and exhaust system, the ethyl alcohol
In-cylinder direct-jet system, the ignition system are connected with the variable valve system, the air inlet system and exhaust system and the gasoline gas
Road spraying system is connected, and the air inlet system and exhaust system are connected with the gas recirculation system, gasoline gas-duct jetting system
System, the ethyl alcohol in-cylinder direct-jet system, the ignition system, the variable valve system and the gas recirculation system and institute
It states electronic control unit to be connected, the engine body uses high geometrical compression ratio；
The engine body is used for combust mixed gas；
The air inlet system and exhaust system, for mixed gas to be flowed into the cylinder of the engine body and the engine is discharged
Exhaust gas in the cylinder of ontology；
The gasoline air flue spraying system is used for the manifold injection gasoline；
The ethyl alcohol in-cylinder direct-jet system, for the cylinder direct injection ethyl alcohol to the engine body；
The ignition system, for lighting a fire in the cylinder of the engine；
The variable valve system, for described in the close moment change by adjusting variable exhaust valve and variable exhaust valve
The effective compression ratio and exhaust gas remnants rate of the cylinder of engine body；
The gas recirculation system, the portion for the exhaust manifold to be discharged flow back into the air inlet discrimination
Pipe；
The electronic control unit controls the gasoline air flue spraying system for the operating condition according to engine
Gasoline spray regime, the ethyl alcohol spray regime of the ethyl alcohol in-cylinder direct-jet system, the ignition system time of ignition, it is described can
Exhaust gas follows again in the close moment and the gas recirculation system of variable exhaust valve and variable exhaust valve in air valve variation system
The opening angle of ring valve door.
Preferably, the air inlet system and exhaust system include inlet manifold, exhaust manifold, air throttle, compressor and turbine.
Preferably, the gasoline air flue spraying system includes Fuel Petroleum case, low pressure petrol pump and gasoline air flue nozzle, institute
Gasoline air flue nozzle is stated to be connected with the inlet manifold；
The ethyl alcohol in-cylinder direct-jet system includes alcohol fuel case, high-pressure ethanol pump and ethyl alcohol high pressure nozzle, the ethyl alcohol
High pressure nozzle is connected with the cylinder of the engine body.
Preferably, the gasoline spray regime of the gasoline air flue spraying system includes the injection duration of gasoline；It is described
The ethyl alcohol spray regime of ethyl alcohol in-cylinder direct-jet system include the injection pressure of ethyl alcohol, ethyl alcohol injecting times, ethanol injecting time and
Ethyl alcohol injection duration.
Second aspect, the embodiment of the invention provides a kind of control methods of combustion system of engine, which is characterized in that packet
It includes:
Obtain engine speed and throttle signal；
According to the engine speed and throttle signal, the operating condition of engine is obtained, the engine is high geometry
The engine of compression ratio；
Gasoline gas-duct jetting system is controlled by using corresponding combustion mode according to the operating condition of the engine
The gasoline spray regime of system, the ethyl alcohol spray regime of ethyl alcohol in-cylinder direct-jet system, the time of ignition of ignition system, changeable air valve system
In system in the close moment and gas recirculation system of variable exhaust valve and variable exhaust valve exhaust gas recirculation (egr) valve unlatching
Angle.
Preferably, the gasoline spray regime of the gasoline air flue spraying system includes the injection duration of gasoline；It is described
The ethyl alcohol spray regime of ethyl alcohol in-cylinder direct-jet system include the injection pressure of ethyl alcohol, ethyl alcohol injecting times, ethanol injecting time and
Ethyl alcohol injection duration.
Preferably, described according to the engine when the operating condition of engine is cold start-up operating condition and idling operation
Operating condition control gasoline spray regime, the ethyl alcohol cylinder of gasoline air flue spraying system by using corresponding combustion mode
The ethyl alcohol spray regime of interior direct-injection system, the time of ignition of ignition system, variable exhaust valve and variable row in variable valve system
The opening angle of exhaust gas recirculation (egr) valve in the close moment and gas recirculation system of valve, specifically:
When the operating condition of engine is cold start-up operating condition and idling operation, fired using gasoline air flue injection spark ignition
Burning mode controls the gasoline injection duration of the gasoline air flue spraying system and the time of ignition of the ignition system.
Preferably, when the operating condition of engine is middle-low load working condition, the operation work according to the engine
Condition controls gasoline spray regime, the ethyl alcohol in-cylinder direct-jet system of gasoline air flue spraying system by using corresponding combustion mode
The ethyl alcohol spray regime of system, the time of ignition of ignition system, in variable valve system variable exhaust valve and variable exhaust valve pass
The opening angle of exhaust gas recirculation (egr) valve in moment and gas recirculation system is closed, specifically:
When the operating condition of engine is middle-low load working condition, using gasoline gas-duct jetting bump combustion chamber mode,
Control the pass of variable exhaust valve in the gasoline injection duration and the variable valve system of the gasoline air flue spraying system
Close the moment.
Preferably, when the operating condition of engine is moderate duty operating condition, the operation work according to the engine
Condition controls gasoline spray regime, the ethyl alcohol in-cylinder direct-jet system of gasoline air flue spraying system by using corresponding combustion mode
The ethyl alcohol spray regime of system, the time of ignition of ignition system, in variable valve system variable exhaust valve and variable exhaust valve pass
The opening angle of exhaust gas recirculation (egr) valve in moment and gas recirculation system is closed, specifically:
When the operating condition of engine is moderate duty, using gasoline gas-duct jetting and ethyl alcohol in-cylinder direct-jet homogeneity compression-ignition
Combustion mode controls the gasoline injection duration of the gasoline air flue spraying system, the second of the ethyl alcohol in-cylinder direct-jet system
Alcohol sprays pressure, ethyl alcohol injecting times, ethanol injecting time and ethyl alcohol injection duration and the gas recirculation system
The opening angle of middle exhaust gas recirculation (egr) valve.
Preferably, further includes:
When the operating condition of engine is moderate duty, the feedback signal of detonation sensor is obtained；
If the feedback signal of the detonation sensor is pinking or pre-ignition signal, control is postponed can in variable valve system
Become the close moment of inlet valve, control reduces the gasoline injection duration of the gasoline air flue spraying system, increases the second
The ethyl alcohol injection duration of alcohol in-cylinder direct-jet system.
Preferably, described according to the hair when the operating condition of engine is middle and high load working condition and high load working condition
The operating condition of motivation controls gasoline spray regime, the second of gasoline air flue spraying system by using corresponding combustion mode
The ethyl alcohol spray regime of alcohol in-cylinder direct-jet system, the time of ignition of ignition system, variable exhaust valve and can in variable valve system
Become the opening angle of exhaust gas recirculation (egr) valve in the close moment and gas recirculation system of exhaust valve, specifically:
When the operating condition of engine is middle and high load working condition and high load working condition, using gasoline gas-duct jetting and ethyl alcohol
In-cylinder direct-jet spark ignition modes control gasoline injection duration, the ethyl alcohol in-cylinder direct-jet of the gasoline air flue spraying system
The ethyl alcohol injection pressure of system, ethyl alcohol injecting times, ethanol injecting time, ethyl alcohol injection duration, the ignition system
Time of ignition and the close moment for postponing variable intake valve in variable valve system.
Preferably, further includes:
When the operating condition of engine is middle and high load working condition and high load working condition, the feedback letter of detonation sensor is obtained
Number；
If the feedback signal of the detonation sensor is pinking or pre-ignition signal, control reduces the gasoline gas-duct jetting
The gasoline injection duration of system increases the ethyl alcohol injection duration of the ethyl alcohol in-cylinder direct-jet system, postpones the second
The ethanol injecting time of alcohol in-cylinder direct-jet system.
Compared with prior art, the present invention has at least the following advantages:
Using the technical solution of the embodiment of the present invention, combustion system of engine includes engine body, air inlet system and exhaust system, vapour
Oil gas road spraying system, ethyl alcohol in-cylinder direct-jet system, ignition system, variable valve system, gas recirculation system and electronics control
Unit processed；The engine body and the air inlet system and exhaust system, the ethyl alcohol in-cylinder direct-jet system, the ignition system and described
Variable valve system is connected, and the air inlet system and exhaust system are connected with the gasoline air flue spraying system, the air inlet system and exhaust system
Be connected the gasoline air flue spraying system, the ethyl alcohol in-cylinder direct-jet system, the igniting with the gas recirculation system
System, the variable valve system and the gas recirculation system are connected with the electronic control unit, the engine
Ontology uses high geometrical compression ratio；The electronic control unit controls the gasoline air flue spraying system according to operating condition
Gasoline spray regime, the ethyl alcohol spray regime of the ethyl alcohol in-cylinder direct-jet system, the ignition system time of ignition, it is described can
Exhaust gas follows again in the close moment and the gas recirculation system of variable exhaust valve and variable exhaust valve in air valve variation system
The opening angle of ring valve door realizes gasoline and ethyl alcohol double fuel compound combustion by corresponding combustion mode.It can be seen that using
Gasoline and ethyl alcohol double fuel compound combustion inhibit the pre-ignition and pinking tendency in high load working condition region, improve the low speed of engine
Torque and power density improve efficiency of combustion and the thermal efficiency.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The some embodiments recorded in application, for those of ordinary skill in the art, without creative efforts,
It can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is a kind of structural schematic diagram of combustion system of engine provided in an embodiment of the present invention；
Fig. 2 is a kind of flow diagram of the control method of combustion system of engine provided in an embodiment of the present invention.
Specific embodiment
In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction in the embodiment of the present invention
Attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only this
Invention a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art exist
Every other embodiment obtained under the premise of creative work is not made, shall fall within the protection scope of the present invention.
Supercharged direct-injection engine is the mainstream of current development of engine, and supercharging technology can be obviously improved the function of engine
Rate density improves the performance and fuel economy of internal combustion engine；Gasoline in-cylinder direct-jet technology can be with by direct-injection fuel evaporation heat absorption
Hot atmosphere is reduced, volumetric efficiency is improved, pinking or pre-ignition is effectively inhibited to be inclined to, allows to improve using higher compression ratio and start
The fuel economy of machine；Moreover, pressurization direct injection technology can significantly improve the dynamic response of engine.
Inventor has found that for common engine, since supercharged direct-injection in the prior art is dynamic
The reinforcing degree of machine is higher, and peak combustion pressure and temperature can increase in cylinder, causes supercharged direct-injection engine in big load work
There is phenomenon of detonation in condition region, limits the promotion of engine power density and low speed torque；And its physics and chemistry belongs to due to gasoline
Property limitation, spraying wet wall and local mixing caused by gasoline direct unevenly also result in the particulate matter of direct fuel-injection engine
Discharge is significant to be increased, and particle size is small, big to the harm of human body, is unsatisfactory for emission regulation both domestic and external all to of engine
The limitation of grain object discharge；In addition to this, supercharged direct-injection engine easily generates incrustation, and fuel economy decline, discharge is caused to dislike
Change, incrustation and soot particle can also induce pre-ignition and super detonation.
In order to solve this problem, in embodiments of the present invention, combustion system of engine includes engine body, intake and exhaust
System, gasoline air flue spraying system, ethyl alcohol in-cylinder direct-jet system, ignition system, variable valve system, gas recirculation system and
Electronic control unit；The engine body and the air inlet system and exhaust system, the ethyl alcohol in-cylinder direct-jet system, the ignition system
It is connected with the variable valve system, the air inlet system and exhaust system are connected with the gasoline air flue spraying system, described into row
Gas system is connected the gasoline air flue spraying system, the ethyl alcohol in-cylinder direct-jet system, institute with the gas recirculation system
Ignition system, the variable valve system and the gas recirculation system is stated to be connected with the electronic control unit, it is described
Engine body uses high geometrical compression ratio；The electronic control unit controls the gasoline gas-duct jetting according to operating condition
The gasoline spray regime of system, the ethyl alcohol spray regime of the ethyl alcohol in-cylinder direct-jet system, the ignition system time of ignition,
It gives up in the close moment and the gas recirculation system of variable exhaust valve and variable exhaust valve in the variable valve system
The opening angle of gas recirculation (egr) valve realizes gasoline and ethyl alcohol double fuel compound combustion by corresponding combustion mode.Thus may be used
See, using gasoline and ethyl alcohol double fuel compound combustion, inhibits the pre-ignition and pinking tendency in high load working condition region, improve engine
Low speed torque and power density, improve efficiency of combustion and the thermal efficiency.
With reference to the accompanying drawing, by embodiment come combustion system of engine and engine in the present invention will be described in detail embodiment
The specific implementation of the control method of combustion system.
Exemplary system
Referring to Fig. 1, a kind of structural schematic diagram of combustion system of engine in the embodiment of the present invention is shown.In the present embodiment
In, the system for example can specifically include:
Engine body 101, air inlet system and exhaust system 102, gasoline air flue spraying system 103, ethyl alcohol in-cylinder direct-jet system 104,
Ignition system 105, variable valve system 106, gas recirculation system 107 and electronic control unit 108；The engine body
101 with the air inlet system and exhaust system 102, the ethyl alcohol in-cylinder direct-jet system 104, the ignition system 105 and the changeable air valve
System 106 is connected, and the air inlet system and exhaust system 102 are connected with the gasoline air flue spraying system 103, the air inlet system and exhaust system
Be connected with the gas recirculation system 107 the gasoline air flue spraying system 103, the ethyl alcohol in-cylinder direct-jet system 104,
The ignition system 105, the variable valve system 106 and the gas recirculation system 107 and the electronic control unit
108 are connected, and the engine body 101 uses high geometrical compression ratio；
The engine body 101 is used for combust mixed gas；
The air inlet system and exhaust system 102, for flowing into mixed gas described in cylinder and the discharge of the engine body 101
Exhaust gas in the cylinder of engine body 101；
The gasoline air flue spraying system 103 is used for the manifold injection gasoline；
The ethyl alcohol in-cylinder direct-jet system 104, for the cylinder direct injection ethyl alcohol to the engine body 101；
The ignition system 105, for lighting a fire in the cylinder of the engine；
The variable valve system 106, for the close moment change by adjusting variable exhaust valve and variable exhaust valve
The effective compression ratio and exhaust gas remnants rate of the cylinder of the engine body；
The gas recirculation system 107, the portion for the exhaust manifold to be discharged flow back into the air inlet
Manifold；
The electronic control unit 108 controls the gasoline air flue spraying system 103 for the operating condition of engine
Gasoline spray regime, the ethyl alcohol spray regime of the ethyl alcohol in-cylinder direct-jet system 104, the ignition system 105 igniting when
It carves, the close moment and exhaust gas recycling of variable exhaust valve and variable exhaust valve are in the variable valve system 106
The opening angle of exhaust gas recirculation (egr) valve in system 107.
It is understood that due to gasoline its physical and chemical attribute limitation, the discharge quantity of particulate matter of gasoline direct injection engine compared with
Common engine is more, and particle size is small, big to the harm of human body, is unsatisfactory for emission regulation both domestic and external all to of engine
The limitation of grain object discharge.In addition to gasoline, there is a kind of common renewable biomass oxygenated fuel --- ethyl alcohol, first, ethyl alcohol
High oxygen content can be effectively improved efficiency of combustion up to 35%, reduce the imperfect combustions products such as UHC and CO, improve engine
Oil consumption and emission level；Second, ethanol octane height (RON 111) can use high compression ratio, improve the thermal efficiency of engine
And dynamic property；Third, ethanol evaporation latent heat is big, and the air inflow of engine can be improved, to improve the dynamic property of engine.But
Since the calorific value of ethyl alcohol is lower, and in middle-low load working condition region, the activity of ethyl alcohol is lower, can cause imperfect combustion, UHC
With the deterioration of CO discharge, it is difficult to which straight alcohol is used for engine.Therefore, in the present embodiment, using the gasoline gas-duct jetting
System 103 and the ethyl alcohol in-cylinder direct-jet system 104, which are realized, provides gasoline and ethyl alcohol double fuel, and electronic control unit 108 can be with
Gasoline spray regime, the ethyl alcohol of adjustment gasoline air flue spraying system 103 are neatly controlled according to the operating condition of engine
The ethyl alcohol spray regime of in-cylinder direct-jet system 104 and the time of ignition of the ignition system 105.
It is understood that the air inlet system and exhaust system 102 include inlet manifold, exhaust manifold, air throttle, compressor and whirlpool
Turbine.
It should be noted that in specific implementation, fuel injection system is generally made of fuel tank, pump and nozzle.Therefore,
In the present embodiment, the gasoline air flue spraying system 103 includes Fuel Petroleum case, low pressure petrol pump and gasoline air flue nozzle；
The ethyl alcohol in-cylinder direct-jet system 104 includes alcohol fuel case, high-pressure ethanol pump and ethyl alcohol high pressure nozzle.Wherein, due to being vapour
Oil is gas-duct jetting, so the gasoline air flue nozzle is connected with the inlet manifold；Ethyl alcohol is in-cylinder direct-jet, so the second
Alcohol high pressure nozzle is connected with the cylinder of the engine body 101.
It should be noted that the gasoline air flue spraying system 103 is using traditional multiple spot electric injection system, oil spout pressure
Power is within 5bar, due to spraying in air flue, good homogeneous charge can be formed, therefore it may only be necessary to control gasoline
Injection duration adjusts distributive value, does not need concern injection pressure and time for spraying and injecting times mix gaseous mixture
The influence of the uniformity.And ethyl alcohol in-cylinder direct-jet system 104 is using high-pressure common rail direct-injection system, since in-cylinder direct-jet causes to mix
The time for closing gas is extremely short, and therefore, it is necessary to control the injection pressure of ethyl alcohol, ethyl alcohol injecting times, ethanol injecting time and second
Four parameters of alcohol injection duration, adjusting these parameters by control can change the concentration of gaseous mixture and activity point in cylinder
Layer, to adapt to the demand of engine operation condition.That is, in the present embodiment, the gasoline of the gasoline air flue spraying system 103 sprays
The state of penetrating includes the injection duration of gasoline；The ethyl alcohol spray regime of the ethyl alcohol in-cylinder direct-jet system 104 includes ethyl alcohol
Spray pressure, ethyl alcohol injecting times, ethanol injecting time and ethyl alcohol injection duration.
It should be noted that engine is in actual motion, constantly changing when operating condition, with the increasing of load
Add, the compression temperature and pressure in cylinder all improve, and will lead to burn rate and the rate of pressure rise increases, and then improve in cylinder and mix
The pinking or pre-ignition tendency of gas are closed, in order to change in operating condition, load can change the engine body when increasing
The effective compression ratio and exhaust gas remnants rate of 101 cylinder, to reduce pinking or the pre-ignition tendency of gaseous mixture in cylinder, in the present embodiment
Some embodiments in, the variable valve system 106, for the closing by adjusting variable exhaust valve and variable exhaust valve
The effective compression ratio of the cylinder of engine body 101 described in time changing and exhaust gas remnants rate.
It should be noted that the exhaust gas of burning can also be carried out when load continues growing operating condition changes
In it is cold after be re-introduced into the inlet manifold of air inlet system and exhaust system 102, and then dilute the oxygen concentration for flowing into mixed gas, mention
High gas concentration lwevel, the reduction of one side oxygen concentration can reduce burn rate, on the other hand due to three atomic gas two
The raising of ratio of the carbonoxide in air inlet, ignition temperature also can be significantly reduced in the specific heat of combustion raising of gaseous mixture in cylinder, comprehensive
For can postpone combustion phase in cylinder, inhibit pinking and pre-ignition.Therefore, in some embodiments of the present embodiment,
The gas recirculation system 107 includes exhaust gas recycling intercooler and exhaust gas recirculation (egr) valve；The gas recirculation system
107, the portion for the exhaust manifold to be discharged flows back into the inlet manifold.
The various embodiments provided through this embodiment, combustion system of engine include engine body, intake and exhaust system
System, gasoline air flue spraying system, ethyl alcohol in-cylinder direct-jet system, ignition system, variable valve system, gas recirculation system and electricity
Sub-control unit；The engine body and the air inlet system and exhaust system, the ethyl alcohol in-cylinder direct-jet system, the ignition system and
The variable valve system is connected, and the air inlet system and exhaust system are connected with the gasoline air flue spraying system, the intake and exhaust
System is connected the gasoline air flue spraying system, the ethyl alcohol in-cylinder direct-jet system, described with the gas recirculation system
Ignition system, the variable valve system and the gas recirculation system are connected with the electronic control unit, the hair
Motivation ontology uses high geometrical compression ratio；The electronic control unit controls gasoline gas-duct jetting system according to operating condition
The gasoline spray regime of system, the ethyl alcohol spray regime of the ethyl alcohol in-cylinder direct-jet system, the time of ignition of the ignition system, institute
State in variable valve system exhaust gas in the close moment and the gas recirculation system of variable exhaust valve and variable exhaust valve
The opening angle of recirculation (egr) valve realizes gasoline and ethyl alcohol double fuel compound combustion by corresponding combustion mode.It can be seen that
Using gasoline and ethyl alcohol double fuel compound combustion, inhibits the pre-ignition and pinking tendency in high load working condition region, improve engine
Low speed torque and power density improve efficiency of combustion and the thermal efficiency.
Illustrative methods
A kind of flow diagram of the control method of combustion system of engine in the embodiment of the present invention is shown referring to fig. 2.
In the present embodiment, the method for example may comprise steps of:
Step 201: obtaining engine speed and throttle signal.
It is understood that the engine speed and throttle signal are obtained according to sensor.
Step 202: according to the engine speed and throttle signal, obtaining the operating condition of engine, the engine
For the engine of high geometrical compression ratio.
Step 203: gasoline gas is controlled by using corresponding combustion mode according to the operating condition of the engine
The gasoline spray regime of road spraying system, the ethyl alcohol spray regime of ethyl alcohol in-cylinder direct-jet system, ignition system time of ignition, can
Exhaust gas recirculation valve in the close moment and gas recirculation system of variable exhaust valve and variable exhaust valve in air valve variation system
The opening angle of door.
It should be noted that the gasoline air flue spraying system is using traditional multiple spot electric injection system, injection pressure
Within 5bar, due to spraying in air flue, good homogeneous charge can be formed, therefore it may only be necessary to control the spray of gasoline
The duration is penetrated to adjust distributive value, concern injection pressure and time for spraying is not needed and injecting times mixes gaseous mixture
The influence of evenness.And ethyl alcohol in-cylinder direct-jet system is using high-pressure common rail direct-injection system, since in-cylinder direct-jet leads to gaseous mixture
Time it is extremely short, therefore, it is necessary to control the injection pressure of ethyl alcohol, ethyl alcohol injecting times, ethanol injecting time and ethyl alcohol spray
Four parameters of duration are penetrated, adjusting these parameters by control can change the concentration of gaseous mixture and activity layering in cylinder, with
Adapt to the demand of engine operation condition.That is, in the present embodiment, the gasoline spray regime packet of the gasoline air flue spraying system
Include the injection duration of gasoline；The ethyl alcohol spray regime of the ethyl alcohol in-cylinder direct-jet system includes injection pressure, the second of ethyl alcohol
Alcohol injecting times, ethanol injecting time and ethyl alcohol injection duration.
It should be noted that engine is in actual motion, constantly changing when operating condition.Under normal circumstances,
The Operation Conditions of engine are distinguished by dividing load range, in the present embodiment by the operating condition of engine point
For cold start-up operating condition, idling operation, middle-low load working condition, moderate duty operating condition, middle and high load working condition and high load working condition.It is different
The corresponding combustion mode of operating condition is not also identical.Wherein, cold start-up operating condition refers to after engine start heat engine to standard state
Preparation operating condition；Idling operation refers to that engine no-load exports, and only maintains the operating condition of idling；Middle-low load working condition, which refers to, to be less than
The operating condition in 30% section at full capacity；Moderate duty operating condition refers to the operating condition in the section at full capacity 30%-60%；Middle and high load working condition and
High load working condition refers to greater than 60% the operating condition in section at full capacity.Emphasis be emphasized that the corresponding combustion of different operating conditions
Burning mode is not also identical, to control the ethyl alcohol of the gasoline spray regime of gasoline air flue spraying system, ethyl alcohol in-cylinder direct-jet system
There is also differences for the time of ignition of spray regime and ignition system.
In practical applications, specifically will cold start-up operating condition, idling operation, middle-low load working condition, moderate duty operating condition, in
High load capacity operating condition and high load working condition division are as follows four kinds of operating conditions, according to pre-set control strategy MAP,
Using corresponding combustion mode, the gasoline spray regime of gasoline air flue spraying system, the second of ethyl alcohol in-cylinder direct-jet system are controlled
The time of ignition of alcohol spray regime and ignition system:
When the operating condition of the first engine is cold start-up operating condition and idling operation, load is smaller, in engine cylinder
Temperature is relatively low, and efficiency of combustion and combustion stability are poor.Since ethyl alcohol is compared with gasoline, octane number is higher to be not easy to ignite,
And gasification latent heat is bigger, so using gasoline air flue injection spark ignition combustion mode, under this operating condition to improve cold open
Efficiency of combustion and combustion stability under condition of starting building and idling operation.Emphasis is the engine of the present embodiment using high Geometric compression
Than, thus combustion stability and the thermal efficiency can all significantly improve compared to the prior art.Therefore, in some implementations of the present embodiment
In mode, the step 203 is for example specifically as follows: when the operating condition of engine is cold start-up operating condition and idling operation,
Using gasoline air flue injection spark ignition combustion mode, control the gasoline air flue spraying system gasoline injection duration and
The time of ignition of the ignition system.Wherein, control the gasoline air flue spraying system gasoline injection duration be in order to
Control gasoline cyclic spray amount.
When the operating condition of second of engine is middle-low load working condition, load is compared with cold start-up operating condition and idling operation
Slightly increased, under this operating condition using gasoline gas-duct jetting bump combustion chamber mode can stable operation, burning
Rate raising improves burning constant volume degree, and ignition temperature reduction has reduced heat transfer loss, and homogeneity compression-ignition may be implemented it is dilute
Thin mixture combustion reduces throttling loss, thus significantly improves the thermal efficiency, while reducing NOx emission, realizes middle-low load work
The high-efficiency cleaning of condition burns.And the engine operation condition of actual motion is transient state, operating condition is ceaselessly changing, with negative
The increase of lotus, the compression temperature of mixed gas and pressure all improve in cylinder, will lead to burn rate and the rate of pressure rise increases, but
At this time also in middle-low load working condition, the close moment for postponing variable exhaust valve in variable valve system can control, to reduce
Exhaust gas remnants rate in cylinder, to reduce the compression temperature of mixed gas in cylinder；On the contrary, if load reduction, control
System shifts to an earlier date the close moment of variable exhaust valve in variable valve system, to increase the exhaust gas remnants rate in cylinder, improves
The temperature of mixed gas at the end of compression.Therefore, in some embodiments of the present embodiment, the step 203 for example has
Body can be with are as follows: when the operating condition of engine is middle-low load working condition, using gasoline gas-duct jetting bump combustion chamber mode,
Control the pass of variable exhaust valve in the gasoline injection duration and the variable valve system of the gasoline air flue spraying system
Close the moment.
When the operating condition of the third engine is moderate duty operating condition, with further increasing for load, peak combustion
Rate improves, and limits Gasoline homogenous charge compression and combustion, since the octane number of ethyl alcohol is higher, anti-knock properties are more preferable, while gas
Cylinder temperature can be reduced by changing latent heat cooling, advantageously reduce burn rate, postpone combustion phase, thus, in this operating condition
When, while gasoline air flue spraying system injected petrol is mixed with air homogeneous, early spray forms a part of ethyl alcohol and sky in cylinder
The homogeneous charge body of gas.And further increasing due to load, the compression temperature of mixed gas and pressure all improve in cylinder,
It will lead to burn rate and the rate of pressure rise increase, improve pinking or the pre-ignition tendency of mixed gas in cylinder, at this time may be used
With will the exhaust gas of burning carry out in it is cold after be re-introduced into motor intake manifold, the oxygen that dilution flows into mixed gas is dense
Degree, improves gas concentration lwevel, and to reduce burn rate, and the specific heat of combustion raising of gaseous mixture also can be significantly reduced in cylinder
Ignition temperature, it is comprehensive for can postpone combustion phase in cylinder, inhibit pinking and pre-ignition.Therefore, the one of the present embodiment
In a little embodiments, the step 203 is for example specifically as follows: when the operating condition of engine is moderate duty, using vapour
Oily gas-duct jetting and ethyl alcohol in-cylinder direct-jet bump combustion chamber mode, the gasoline injection for controlling the gasoline air flue spraying system are held
Ethyl alcohol injection pressure, ethyl alcohol injecting times, ethanol injecting time and the ethyl alcohol injection of continuous time, the ethyl alcohol in-cylinder direct-jet system
The opening angle of exhaust gas recirculation (egr) valve in duration and the gas recirculation system.Wherein, it controls straight in ethyl alcohol cylinder
The ethyl alcohol injection duration of spray system is the cyclic spray amount in order to control ethyl alcohol；Control the ethyl alcohol of ethyl alcohol in-cylinder direct-jet system
Spraying pressure is for the mixing rate of gaseous mixture in master cylinder；Control the ethyl alcohol injecting times and second of ethyl alcohol in-cylinder direct-jet system
Alcohol time for spraying is to control incorporation time；Mixing rate and incorporation time synthesis determine that ethyl alcohol gaseous mixture is most in cylinder
Whole mixture homogeneity.
It should also be noted that, when pinking occurs in engine or pre-ignition is inclined to, can also be adopted with the increase of load
The mode of the close moment of variable intake valve is taken and postponed, to reduce effective compression ratio, and then burn rate is reduced, inhibits quick-fried
Shake or pre-ignition tendency；In addition to this, the injection proportion of ethyl alcohol is improved, that is, the cyclic spray amount for increasing ethyl alcohol reduces gasoline
Cyclic spray amount adapts to the increase of load to reduce the general activity of gaseous mixture in cylinder, is equally beneficial for inhibiting peak combustion speed
Rate and the rate of pressure rise increase, and keep burning relatively soft.Therefore, in some embodiments of the present embodiment, such as can be with
The following steps are included:
Step A: when the operating condition of engine is moderate duty, the feedback signal of detonation sensor is obtained；
Step B: if the feedback signal of the detonation sensor is pinking or pre-ignition signal, changeable air valve system is postponed in control
The close moment of variable intake valve in system, control reduce the gasoline injection duration of the gasoline air flue spraying system, increase
The ethyl alcohol injection duration of the ethyl alcohol in-cylinder direct-jet system.
When the operating condition of 4th kind of engine is middle and high load working condition and high load working condition, as load is again into one
Step increases, and is limited to high burn rate, the factors such as high Pressure Rise Rate and pinking, gasoline gas-duct jetting and ethyl alcohol in-cylinder direct-jet are equal
Matter compression ignition combustion mode cannot achieve.Therefore, under this operating condition, in order to control peak burn rate, pinking is avoided
And pre-ignition, it reduces effective compression ratio and is compression-ignited to avoid mixed gas in cylinder, sparking mode is transformed into traditional spark ignition.
It can similarly obtain, in this operating condition, it is necessary to the mode of the close moment of variable intake valve is taken and postpones, it is effective to reduce
Compression ratio, and then burn rate is reduced, inhibit pinking or pre-ignition tendency.Therefore, in some embodiments of the present embodiment,
The step 203 is for example specifically as follows: when the operating condition of engine is middle and high load working condition and high load working condition, using
Gasoline gas-duct jetting and ethyl alcohol in-cylinder direct-jet spark ignition modes, the gasoline injection for controlling the gasoline air flue spraying system continue
When time, the ethyl alcohol injection pressure of ethyl alcohol in-cylinder direct-jet system, ethyl alcohol injecting times, ethanol injecting time, ethyl alcohol injection continue
Between, the time of ignition of the ignition system and the close moment for postponing variable intake valve in variable valve system.
Can similarly obtain, in some embodiments of the present embodiment, such as can with the following steps are included:
Step C: when the operating condition of engine is middle and high load working condition and high load working condition, detonation sensor is obtained
Feedback signal；
Step D: if the feedback signal of the detonation sensor is pinking or pre-ignition signal, control reduces the gasoline gas
The gasoline injection duration of road spraying system increases the ethyl alcohol injection duration of the ethyl alcohol in-cylinder direct-jet system, postpones
The ethanol injecting time of the ethyl alcohol in-cylinder direct-jet system.
The various embodiments provided through this embodiment obtain engine speed and throttle signal；Started according to described
Machine revolving speed and throttle signal obtain the operating condition of engine；According to the operating condition of the engine, by using corresponding
Combustion mode, control the gasoline spray regime of gasoline air flue spraying system, ethyl alcohol in-cylinder direct-jet system ethyl alcohol spray regime,
The close moment and exhaust gas of variable exhaust valve and variable exhaust valve are followed again in the time of ignition of ignition system, variable valve system
The opening angle of exhaust gas recirculation (egr) valve in loop system.It can be seen that improving combustion using gasoline and ethyl alcohol double fuel compound combustion
Burn efficiency, the thermal efficiency and fuel economy, the significant high load working condition upper limit for extending engine.According to the operation work of engine
Condition realizes different combustion modes: when cold start-up operating condition and idling operation, using gasoline air flue injection spark ignition burning mould
Formula, high geometrical compression ratio can significantly improve combustion stability and the thermal efficiency；When middle-low load working condition, sprayed using gasoline air flue
Bump combustion chamber mode is penetrated, controls exhaust gas inside cylinder remnants rate in conjunction with the close moment of control variable exhaust valve, is improved small negative
The combustion stability of lotus；When moderate duty, using gasoline gas-duct jetting and ethyl alcohol in-cylinder direct-jet bump combustion chamber mode, ethyl alcohol
The general activity that direct-injection reduces gaseous mixture in cylinder expands the condition range of homogeneity compression-ignition high-efficiency cleaning burning；In order to cover full load
When operating condition, middle and high load working condition and high load working condition, using gasoline gas-duct jetting and ethyl alcohol in-cylinder direct-jet spark ignition modes, knot
The close moment that variable intake valve is postponed in control is closed, effective compression ratio is reduced, so that it is early to effectively inhibit high load working condition in cylinder
The generation of combustion and pinking extends the range of high load working condition, improves low engine speed torque and power density；Simultaneously because second
The high oxygen containing characteristic of alcohol, can inhibit the particulate matter of direct-injection to generate, reduce supercharged direct-injection engine carbon-deposits the cylinder generate with
Grain object discharge, meets stringent particulate emission requirement under the premise of not depending on grain catcher.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.The terms "include", "comprise" or its any other variant are intended to non-row
His property includes, so that the process, method, article or equipment for including a series of elements not only includes those elements, and
And further include other elements that are not explicitly listed, or further include for this process, method, article or equipment institute it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including institute
State in the process, method, article or equipment of element that there is also other identical elements.
The above described is only a preferred embodiment of the present invention, being not intended to limit the present invention in any form.Though
So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention.It is any to be familiar with those skilled in the art
Member, without departing from the scope of the technical proposal of the invention, all using the methods and technical content of the disclosure above to the present invention
Technical solution makes many possible changes and modifications or equivalent example modified to equivalent change.Therefore, it is all without departing from
The content of technical solution of the present invention, according to the technical essence of the invention any simple modification made to the above embodiment, equivalent
Variation and modification, all of which are still within the scope of protection of the technical scheme of the invention.
Claims (12)
1. a kind of combustion system of engine characterized by comprising engine body, air inlet system and exhaust system, gasoline gas-duct jetting system
System, ethyl alcohol in-cylinder direct-jet system, ignition system, variable valve system, gas recirculation system and electronic control unit；The hair
Motivation ontology and the air inlet system and exhaust system, the ethyl alcohol in-cylinder direct-jet system, the ignition system and the variable valve system
It is connected, the air inlet system and exhaust system are connected with the gasoline air flue spraying system, and the air inlet system and exhaust system and the exhaust gas are again
The circulatory system is connected, the gasoline air flue spraying system, the ethyl alcohol in-cylinder direct-jet system, the ignition system, it is described can
Air valve variation system and the gas recirculation system are connected with the electronic control unit, and the engine body is using high several
What compression ratio；
The engine body is used for combust mixed gas；
The air inlet system and exhaust system, for mixed gas to be flowed into the cylinder of the engine body and the engine body is discharged
Cylinder in exhaust gas；
The gasoline air flue spraying system is used for the manifold injection gasoline；
The ethyl alcohol in-cylinder direct-jet system, for the cylinder direct injection ethyl alcohol to the engine body；
The ignition system, for lighting a fire in the cylinder of the engine；
The variable valve system, for starting described in the close moment change by adjusting variable exhaust valve and variable exhaust valve
The effective compression ratio and exhaust gas remnants rate of the cylinder of machine ontology；
The gas recirculation system, the portion for the exhaust manifold to be discharged flow back into the inlet manifold；
The electronic control unit controls the gasoline of the gasoline air flue spraying system for the operating condition according to engine
Spray regime, the ethyl alcohol spray regime of the ethyl alcohol in-cylinder direct-jet system, the time of ignition of the ignition system, the variable gas
Exhaust gas recirculation valve in the close moment and the gas recirculation system of variable exhaust valve and variable exhaust valve in door system
The opening angle of door.
2. combustion system of engine according to claim 1, which is characterized in that the air inlet system and exhaust system include air inlet discrimination
Pipe, exhaust manifold, air throttle, compressor and turbine.
3. combustion system of engine according to claim 2, which is characterized in that the gasoline air flue spraying system includes vapour
Oil fuel case, low pressure petrol pump and gasoline air flue nozzle, the gasoline air flue nozzle are connected with the inlet manifold；
The ethyl alcohol in-cylinder direct-jet system includes alcohol fuel case, high-pressure ethanol pump and ethyl alcohol high pressure nozzle, the ethyl alcohol high pressure
Nozzle is connected with the cylinder of the engine body.
4. combustion system of engine according to claim 1, which is characterized in that the gasoline of the gasoline air flue spraying system
Spray regime includes the injection duration of gasoline；The ethyl alcohol spray regime of the ethyl alcohol in-cylinder direct-jet system includes the spray of ethyl alcohol
Injection pressure, ethyl alcohol injecting times, ethanol injecting time and ethyl alcohol injection duration.
5. a kind of control method of combustion system of engine characterized by comprising
Obtain engine speed and throttle signal；
According to the engine speed and throttle signal, the operating condition of engine is obtained, the engine is high Geometric compression
The engine of ratio；
Gasoline air flue spraying system is controlled by using corresponding combustion mode according to the operating condition of the engine
Gasoline spray regime, the ethyl alcohol spray regime of ethyl alcohol in-cylinder direct-jet system, the time of ignition of ignition system, in variable valve system
The opening angle of exhaust gas recirculation (egr) valve in the close moment and gas recirculation system of variable exhaust valve and variable exhaust valve.
6. according to the method described in claim 5, it is characterized in that, the gasoline spray regime packet of the gasoline air flue spraying system
Include the injection duration of gasoline；The ethyl alcohol spray regime of the ethyl alcohol in-cylinder direct-jet system includes injection pressure, the second of ethyl alcohol
Alcohol injecting times, ethanol injecting time and ethyl alcohol injection duration.
7. according to the method described in claim 6, it is characterized in that, when the operating condition of engine is cold start-up operating condition and idling
When operating condition, the operating condition according to the engine controls gasoline gas-duct jetting by using corresponding combustion mode
The gasoline spray regime of system, the ethyl alcohol spray regime of ethyl alcohol in-cylinder direct-jet system, ignition system time of ignition, changeable air valve
Exhaust gas recirculation (egr) valve is opened in the close moment and gas recirculation system of variable exhaust valve and variable exhaust valve in system
Angle is opened, specifically:
When the operating condition of engine is cold start-up operating condition and idling operation, using gasoline air flue injection spark ignition burning mould
Formula controls the gasoline injection duration of the gasoline air flue spraying system and the time of ignition of the ignition system.
8. according to the method described in claim 6, it is characterized in that, when the operating condition of engine be middle-low load working condition when,
The operating condition according to the engine controls gasoline air flue spraying system by using corresponding combustion mode
Gasoline spray regime, the ethyl alcohol spray regime of ethyl alcohol in-cylinder direct-jet system, the time of ignition of ignition system, in variable valve system
The opening angle of exhaust gas recirculation (egr) valve in the close moment and gas recirculation system of variable exhaust valve and variable exhaust valve,
Specifically:
When the operating condition of engine is middle-low load working condition, using gasoline gas-duct jetting bump combustion chamber mode, control
In the gasoline injection duration of the gasoline air flue spraying system and the variable valve system when closing of variable exhaust valve
It carves.
9. according to the method described in claim 6, it is characterized in that, when the operating condition of engine be moderate duty operating condition when,
The operating condition according to the engine controls gasoline air flue spraying system by using corresponding combustion mode
Gasoline spray regime, the ethyl alcohol spray regime of ethyl alcohol in-cylinder direct-jet system, the time of ignition of ignition system, in variable valve system
The opening angle of exhaust gas recirculation (egr) valve in the close moment and gas recirculation system of variable exhaust valve and variable exhaust valve,
Specifically:
When the operating condition of engine is moderate duty, using gasoline gas-duct jetting and ethyl alcohol in-cylinder direct-jet bump combustion chamber
Mode controls the ethyl alcohol spray of the gasoline injection duration, the ethyl alcohol in-cylinder direct-jet system of the gasoline air flue spraying system
It gives up in injection pressure, ethyl alcohol injecting times, ethanol injecting time and ethyl alcohol injection duration and the gas recirculation system
The opening angle of gas recirculation (egr) valve.
10. according to the method described in claim 9, it is characterized by further comprising:
When the operating condition of engine is moderate duty, the feedback signal of detonation sensor is obtained；
If the feedback signal of the detonation sensor be pinking or pre-ignition signal, control postpone variable valve system in can be changed into
The close moment of valve, control reduce the gasoline injection duration of the gasoline air flue spraying system, increase the ethyl alcohol cylinder
The ethyl alcohol injection duration of interior direct-injection system.
11. according to the method described in claim 6, it is characterized in that, when engine operating condition be middle and high load working condition and
When high load working condition, the operating condition according to the engine controls gasoline gas by using corresponding combustion mode
The gasoline spray regime of road spraying system, the ethyl alcohol spray regime of ethyl alcohol in-cylinder direct-jet system, ignition system time of ignition, can
Exhaust gas recirculation valve in the close moment and gas recirculation system of variable exhaust valve and variable exhaust valve in air valve variation system
The opening angle of door, specifically:
When the operating condition of engine is middle and high load working condition and high load working condition, using in gasoline gas-duct jetting and ethyl alcohol cylinder
Direct-injection spark ignition mode controls gasoline injection duration, the ethyl alcohol in-cylinder direct-jet system of the gasoline air flue spraying system
Ethyl alcohol injection pressure, ethyl alcohol injecting times, ethanol injecting time, ethyl alcohol injection duration, the ignition system igniting
Moment and the close moment for postponing variable intake valve in variable valve system.
12. according to the method for claim 11, which is characterized in that further include:
When the operating condition of engine is middle and high load working condition and high load working condition, the feedback signal of detonation sensor is obtained；
If the feedback signal of the detonation sensor is pinking or pre-ignition signal, control reduces the gasoline air flue spraying system
Gasoline injection duration, increase the ethyl alcohol injection duration of the ethyl alcohol in-cylinder direct-jet system, postpone the ethyl alcohol cylinder
The ethanol injecting time of interior direct-injection system.
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| CN111365133A (en) * | 2020-03-12 | 2020-07-03 | 上海交通大学 | Multi-fuel charging-quantity compression combustion engine combustion system and control method |
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Application publication date: 20190604 |