CN106285965A - Homogenizing supercharging directly jetting gasoline engine scavenging control method - Google Patents
Homogenizing supercharging directly jetting gasoline engine scavenging control method Download PDFInfo
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- CN106285965A CN106285965A CN201610844761.4A CN201610844761A CN106285965A CN 106285965 A CN106285965 A CN 106285965A CN 201610844761 A CN201610844761 A CN 201610844761A CN 106285965 A CN106285965 A CN 106285965A
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- scavenging
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The present invention relates to a kind of homogenizing supercharging directly jetting gasoline engine scavenging control method, it is characterised in that concrete rate-determining steps is as follows: at the supercharging big load area of the directly jetting gasoline engine slow-speed of revolution, control intake and exhaust VVT angle, reduce the residual waste gas quantity being detained in cylinder.By controlling air inlet VVT opening angle and the angle overlap size of aerofluxus VVT closing angle, reach to control the purpose of swept volume；The accurate tolerance in scavenging district and fuel-flow control system can select weak scavenging or strong scavenging by catalyst converter central temperature, calculate distributive value by air-fuel ratio desired value in amount of fresh air in the cylinder that model calculates and cylinder；Before catalyst converter reaches initiation temperature, system uses weak scavenging mode, can improve rapidly catalyst temperature, reduces catalyst converter light-off time；After catalyst converter exceedes initiation temperature, system uses strong scavenging mode, and row's temperature low blower can work long hours, it is possible to provide exports than weak scavenging mode more high pulling torque and power.It can improve rapidly catalyst temperature by after-burning；Strong scavenging calculates distributive value by model makes air-fuel ratio in cylinder be 1, and arranging temperature, to compare weak scavenging mode low, can work long hours.Two ways can increase combustion torque and output.
Description
Technical field
The present invention relates to homogenizing supercharging directly jetting gasoline engine scavenging control method, belong to engine power output control field.
Background technology
The fuel economy regulation of increasingly stringent requires that electromotor develops to small displacement supercharging direction, and the thing followed is that the slow-speed of revolution is big
The problem that the output of load area power is not enough.The power output of electromotor is by participating in the amount of fresh air of burning in entering cylinder certainly
Fixed, small displacement supercharging directly jetting gasoline engine low rotation speed area exhaust back pressure is low, extraction flow is little, causes supercharger to work, leads
The amount of fresh air causing to participate in burning is few, and combustion torque is little.Scavenging control can allow fresh air by increasing valve overlap
It is directly entered exhaustor, increases extraction flow, make supercharger work ahead, increase the amount of fresh air participating in burning, thus increase
High pulling torque exports.
Summary of the invention
The problem not enough in order to solve the output of homogenizing supercharging directly jetting gasoline engine low rotation speed area power, the purpose of the present invention exists
In providing a kind of homogenizing supercharging directly jetting gasoline engine scavenging control method, the method supports two kinds of scavenging modes: weak scavenging and sweeping by force
Gas, the method is distinguished existing control method, is not increased extra scavenging air valve, based on system variable air inlet timing (VVT) hardware
On the basis of, utilize scavenging control method, the fresh sky participating in burning can be increased at the big load area of this type of low engine speeds
Tolerance, weak scavenging calculates distributive value by model makes the air-fuel ratio at catalyst converter be 1, can improve rapidly catalyst converter temperature by after-burning
Degree；Strong scavenging calculates distributive value by model makes air-fuel ratio in cylinder be 1, and arranging temperature, to compare weak scavenging mode low, can work long hours.
Two ways can increase combustion torque and output.
The technical scheme is that and be achieved in that: homogenizing supercharging directly jetting gasoline engine scavenging control method, its feature exists
As follows in concrete rate-determining steps: 1) at the supercharging big load area of the directly jetting gasoline engine slow-speed of revolution, control intake and exhaust VVT(and continuously may be used
Air valve variation timing) angle, make IO Intake Valve Opens angle and exhaust valve closing angular superposition, fresh air promotes waste gas to discharge gas
Cylinder, produces scavenging phenomenon, participates in the amount of fresh air of burning, reduce the residual waste gas quantity being detained in cylinder in increasing cylinder.Pass through
Control air inlet VVT opening angle and the angle overlap size of aerofluxus VVT closing angle, reach to control the purpose of swept volume；2) scavenging
The appraising model of amount and measuring method, the accurate tolerance in scavenging district and fuel-flow control；3) system can pass through catalyst converter central temperature
Select weak scavenging or strong scavenging, calculate oil spout by air-fuel ratio desired value in amount of fresh air in the cylinder that model calculates and cylinder
Amount；Before catalyst converter reaches initiation temperature, system uses weak scavenging mode, can improve rapidly catalyst temperature, reduces catalyst converter
Light-off time；After catalyst converter exceedes initiation temperature, system uses strong scavenging mode, row's temperature low blower to work long hours,
Can provide and export than weak scavenging mode more high pulling torque and power.
The positive effect of the present invention is that it can increase in this kind of combustion mode engine slow-speed of revolution big load area entrance cylinder
Amount of fresh air, thus improve combustion torque and the output of electromotor, improve the power output of low rotation speed area；Can lead to
Later fire, improve rapidly catalyst temperature, reduce catalyst converter light-off time, improve engine emission.
Accompanying drawing explanation
Fig. 1 is that homogenizing supercharging directly jetting gasoline engine scavenging control function defines schematic diagram.
Fig. 2 is homogenizing supercharging directly jetting gasoline engine weak scavenging control flow chart.
Fig. 3 is homogenizing supercharging directly jetting gasoline engine weak scavenging control critical quantity schematic diagram.
Fig. 4 is homogenizing supercharging directly jetting gasoline engine strong scavenging control flow chart.
Fig. 5 is homogenizing supercharging directly jetting gasoline engine strong scavenging control critical quantity schematic diagram.
Fig. 6 is weak scavenging and strong scavenging information comparison diagram.
Fig. 7 is scavenging control actual table rack data figure.
Fig. 8 is scavenging control implementation effect figure.
Change in torque design sketch shown in Fig. 9.
Detailed description of the invention
With embodiment, patent of the present invention is further illustrated below in conjunction with the accompanying drawings, if there is example content in these embodiments,
Should not be construed to limitation of the present invention.
As it is shown in figure 1, the present invention is increased without extra scavenging air valve hardware, supercharger and intake and exhaust VVT is utilized to control phase
Coordinate mutually, when electromotor is in the big load area of low speed, when admission pressure is more than pressure at expulsion, can be by arranging intake and exhaust VVT
Angle, makes exhaust valve closing angle and IO Intake Valve Opens angular superposition, now enters in the fresh air of cylinder can promote cylinder
Waste gas is expelled to exhaust manifold, increases the amount of fresh air participating in burning.
If the catalyst converter central temperature value of the target engine that temperature model calculates uses weak less than initiation temperature, system
Scavenging control mode improves moment of torsion output, reduces catalyst converter light-off time；If catalyst converter central temperature is more than or equal to ignition temperature
Degree, system uses strong scavenging control mode, improves moment of torsion output further.
The moment of torsion of target engine, oil consumption and discharge index select weak scavenging or strong scavenging control mode, and are controlling
System is set by configuration variables.
If Systematic selection weak scavenging control mode, then according to Fig. 2 given the impression of weakness scavenging control flow performing scavenging control.First
First, it may be judged whether meet the enable condition in Fig. 6；If be unsatisfactory for, exit scavenging control, intake and exhaust VVT angle is otherwise set
Degree, throttle opening and supercharger electromagnetic valve dutycycle；Calculate delivery temperature, and judge whether delivery temperature exceedes scavenging control
Delivery temperature limit value；If it exceeds limit value then exits scavenging control, otherwise calculate aeration quantity total amount by intake airflow dynamics model；Arrange
The target air-fuel ratio that catalyst converter goes out, calculates distributive value, and by air-fuel ratio Closed-cycle correction；Calculated by rotating speed, total aeration quantity
The angle of ignition.The variation tendency of the critical quantity of weak scavenging mode is as it is shown on figure 3, the air-fuel ratio at catalyst converter remains 1.
If Systematic selection strong scavenging control mode, then according to scavenging control flow performing scavenging control strong shown in Fig. 4.First
First, it may be judged whether meet the enable condition in Fig. 6；If be unsatisfactory for, exit scavenging control, intake and exhaust VVT angle is otherwise set
Degree, throttle opening and supercharger electromagnetic valve dutycycle；Calculate delivery temperature, and judge whether delivery temperature exceedes scavenging control
Delivery temperature limit value；If it exceeds limit value then exits scavenging control, otherwise by amount of fresh air in intake airflow dynamics model calculating cylinder
And swept volume；Cylinder internal object air-fuel ratio is set, calculates, by swept volume, the target air-fuel ratio that catalyst converter goes out；By fresh in cylinder
Air capacity and cylinder internal object air-fuel ratio calculate distributive value, and by the air-fuel ratio Closed-cycle correction distributive value at catalyst converter；By turning
Fast, total aeration quantity calculates the angle of ignition.The variation tendency of the critical quantity of strong scavenging mode is as it is shown in figure 5, air-fuel ratio in cylinder
Remain 0.9 ~ 1.
The comparative information of scavenging control two ways is shown in that Fig. 6, enable condition are VVT fault-free, air throttle fault-free, increasing
Depressor fault-free, pressure transducer fault-free；Air-fuel ratio at catalyst converter, weak scavenging is 1, and strong scavenging is more than 1(such as,
1.17)；Air-fuel ratio in cylinder, weak scavenging is less than 1(such as, and 0.85), strong scavenging is in 1 adnexa (0.9 ~ 1)；Exhaust emissions, weak
Scavenging is without impact, and strong scavenging NOx emission is high；Fuel consumption, the same operating point of weak scavenging is higher by about 17% than strong scavenging oil consumption；
Dynamic property, weak scavenging can increase 20% moment of torsion, and strong scavenging can increase by 35% moment of torsion；Weak scavenging ratio strong scavenging delivery temperature is high.
By Fig. 7 scavenging district stand Data acquisition and issuance, this patent proposes a kind of swept volume computation model, and proposes
The method of swept volume measured by a kind of stand, for the calibration of model parameter.Scavenging is that double VVT supercharging directly jetting gasoline engine there may be
Special operation condition, scavenging and backflow are two contrary processes, and inlet and exhaust valve is folded when opening, when pressure at expulsion more than admission pressure then
Backflow, when admission pressure is more than pressure at expulsion then scavenging, along with the increase capacity of returns of intake and exhaust pressure ratio can be gradually reduced, when entering row
Air pressure ratio is during equal to 1, and when i.e. admission pressure is equal to pressure at expulsion, capacity of returns is 0, along with intake and exhaust pressure ratio continues to increase, in cylinder
Exhausted air quantity (capacity of returns with hold-up and) is gradually reduced, and exhaust gas inside cylinder amount is the point of 0, is the critical point that scavenging occurs, when
Intake and exhaust pressure ratio then enters scavenging district more than the intake and exhaust pressure ratio of this critical point, now fresh tolerance and by air throttle in cylinder
Total fresh tolerance is the most equal, and some fresh air is not involved in burning and has been directly entered exhaust manifold, according to more than
In the fresh tolerance total for scavenging Qu of analysis design and cylinder, the appraising model of fresh tolerance is as shown in Figure 8.
In order to optimize swept volume computation model, the present invention proposes a kind of swept volume calibration steps.Can be recorded by discharge
CO concentration and O2Concentration is calculated air-fuel ratio in cylinder:
Air-fuel ratio Lambda_cc=a/pow in cylinder (CO/ (20.95-O2)/1000, b)
Wherein: Lambda_cc is air-fuel ratio in cylinder
CO is carbonomonoxide concentration in the waste gas that discharge records
O2For the concentration of oxygen in the waste gas that discharge records
Pow(x, y) represents the y power of x
A, b are constant, are required for different electromotor and demarcate, and scaling method is for selecting three it is unlikely that scavenging operating mode
Rotating speed, moderate duty, intake and exhaust VVT aperture is all set to 0, and same steady working condition, lambda is respectively 1/0.95/0.9/
0.83/0.77, the data matching of three rotating speeds obtains the power exponent curve of an air-fuel ratio and CO/ (20.95-O2)/1000, i.e.
Obtain a and b.By air-fuel ratio calibration Scavenge model parameter in cylinder, improve scavenging control precision.
Change in torque effect after enforcement is as it is shown in figure 9, the big load area of the slow-speed of revolution after implementing scavenging control, and moment of torsion is
Big value can increase by 20% ~ 35%.
Claims (1)
1. homogenizing supercharging directly jetting gasoline engine scavenging control method, it is characterised in that concrete rate-determining steps is as follows: 1) straight in supercharging
The big load area of the injection gasoline engine slow-speed of revolution, controls intake and exhaust VVT(continuous variable valve timing) angle, make IO Intake Valve Opens angle
With exhaust valve closing angular superposition, fresh air promotes waste gas to discharge cylinder, produces scavenging phenomenon, participates in burning in increasing cylinder
Amount of fresh air, reduce the residual waste gas quantity being detained in cylinder, close angle by controlling air inlet VVT opening angle and aerofluxus VVT
The angle overlap size of degree, reaches to control the purpose of swept volume；2) appraising model of swept volume and measuring method, scavenging district is accurate
Tolerance and fuel-flow control；3) system can select weak scavenging or strong scavenging by catalyst converter central temperature, is calculated by model
In cylinder, in amount of fresh air and cylinder, air-fuel ratio desired value calculates distributive value；Before catalyst converter reaches initiation temperature, system uses weak
Scavenging mode, can improve rapidly catalyst temperature, reduces catalyst converter light-off time；After catalyst converter exceedes initiation temperature, system
Using strong scavenging mode, row's temperature low blower can work long hours, it is possible to provide exports than weak scavenging mode more high pulling torque and power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610844761.4A CN106285965B (en) | 2016-09-23 | 2016-09-23 | Scavenging control method for homogeneous supercharged direct injection gasoline engine |
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| CN201610844761.4A CN106285965B (en) | 2016-09-23 | 2016-09-23 | Scavenging control method for homogeneous supercharged direct injection gasoline engine |
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| CN106285965A true CN106285965A (en) | 2017-01-04 |
| CN106285965B CN106285965B (en) | 2019-12-27 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108798917A (en) * | 2017-04-28 | 2018-11-13 | 长城汽车股份有限公司 | A kind of engine blow-through air control method and device |
| CN109578154A (en) * | 2019-01-28 | 2019-04-05 | 天津大学 | The method burnt using changeable air valve real-time control direct spray petrol engine in cylinder equivalent |
| CN109883719A (en) * | 2019-02-27 | 2019-06-14 | 中国第一汽车股份有限公司 | A kind of pressurization directly jetting gasoline engine scavenging measuring method |
| CN111315976A (en) * | 2017-11-07 | 2020-06-19 | Fca美国有限责任公司 | Engine control system and method for adjusting emissions during scavenging |
| CN111765010A (en) * | 2020-06-01 | 2020-10-13 | 东风汽车集团有限公司 | Method for determining scavenging activation working condition of supercharged direct injection engine |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108798917A (en) * | 2017-04-28 | 2018-11-13 | 长城汽车股份有限公司 | A kind of engine blow-through air control method and device |
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| CN111315976A (en) * | 2017-11-07 | 2020-06-19 | Fca美国有限责任公司 | Engine control system and method for adjusting emissions during scavenging |
| CN109578154A (en) * | 2019-01-28 | 2019-04-05 | 天津大学 | The method burnt using changeable air valve real-time control direct spray petrol engine in cylinder equivalent |
| CN109883719A (en) * | 2019-02-27 | 2019-06-14 | 中国第一汽车股份有限公司 | A kind of pressurization directly jetting gasoline engine scavenging measuring method |
| CN111765010A (en) * | 2020-06-01 | 2020-10-13 | 东风汽车集团有限公司 | Method for determining scavenging activation working condition of supercharged direct injection engine |
| CN111765010B (en) * | 2020-06-01 | 2021-07-23 | 东风汽车集团有限公司 | Method for determining scavenging activation working condition of supercharged direct injection engine |
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