CN102155311A - Secondary combustion working method of six-stroke internal-combustion engine - Google Patents
Secondary combustion working method of six-stroke internal-combustion engine Download PDFInfo
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- CN102155311A CN102155311A CN2011101404117A CN201110140411A CN102155311A CN 102155311 A CN102155311 A CN 102155311A CN 2011101404117 A CN2011101404117 A CN 2011101404117A CN 201110140411 A CN201110140411 A CN 201110140411A CN 102155311 A CN102155311 A CN 102155311A
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Abstract
The invention relates to a secondary combustion working method of a six-stroke internal-combustion engine. In the method, one working cycle of the internal-combustion engine can be divided into an air intake stroke, a primary compression stroke, a primary combustion stroke, a secondary compression stroke, a secondary combustion stroke and an exhaust stroke in sequence by the movement of a piston of the internal-combustion engine, wherein in the primary combustion stroke, primary fuel is used for combustion, and in the secondary combustion stroke, secondary fuel is used for combustion; the primary fuel is sprayed in a cylinder body of the internal-combustion engine in the primary compression stroke, the secondary fuel is sprayed in the cylinder body of the internal-combustion engine at the moment that the piston of the internal-combustion engine gets away a top dead center of the secondary combustion stroke or in the secondary combustion stroke. In the method, the fuel air ratio of the sum of the primary fuel and the secondary fuel, and the intake air of the air intake stroke is not more than the fuel air ratio in theory of the fuel mixed by the primary fuel and the secondary fuel. In the secondary combustion working method of the six-stroke internal-combustion engine, the problem that the internal-combustion engine has poor consumption performance under high-load working condition is solved, and simultaneously the discharge of harmful tail gas of the internal-combustion engine is greatly reduced.
Description
Technical field
The present invention relates to a kind of 6-stroke IC engine secondary combustion method of work.
Background technique
Common four-stroke in-cylinder direct injection internal-combustion engine, in " air inlet-compression-burning-exhaust " work cycle, the burning of mixed gas all is once to finish.Because mixed gas is difficult for mixing, cause the phenomenon of smoldering so be prone to the local overrich of mixed gas during high load working condition.A kind of improved method is to take the multistage fuel injection, and as 5 sections injections of diesel engine, the part fuel oil sprays in combustion process, and the part of mixed gas after-burning as a result is many, makes combustion expansion pressure can not bring into play best acting effect.
The technical development of in-cylinder direct fuel-injection engine for many years, people mainly concentrate on and improve constantly injection pressure, promote burning to finish fast, reduce the after-burning part.Improve injection pressure, mean that technical difficulty increases, component costs improves.
In addition, application number is that Chinese patent 00113997.5,2005100441 65.X, 200910014756.0 etc. reduce delivery temperature by the steam acting, reach the purpose that improves fuel thermal efficiency, but all can not solve the problem of combustion performance difference under the in-cylinder direct injection internal-combustion engine high load working condition, even occur because of the excessive problem that falls flat of the gasification latent heat of water.
Summary of the invention
The object of the present invention is to provide a kind of 6-stroke IC engine secondary combustion method of work, to solve the problem of combustion performance difference under the internal-combustion engine high load working condition.
In order to address the above problem, 6-stroke IC engine secondary combustion method of work of the present invention is by the following technical solutions: 6-stroke IC engine secondary combustion method of work, this method is divided into aspirating stroke, compression stroke, primary combustion stroke, secondary compression stroke, secondary combustion stroke and six strokes of exhaust stroke by internal combustion engine motion successively with a work cycle of internal-combustion engine, the fuel that wherein said primary combustion stroke uses is primary fuel, and the fuel that described secondary combustion stroke uses is secondary fuel; Described primary fuel sprays in the internal combustion engine cylinders in a described compression stroke, described secondary fuel leave at internal combustion engine described secondary combustion stroke top dead center the moment or spray in the internal combustion engine cylinders at described secondary compression stroke; The work of described six stroke correspondences is as follows:
1) aspirating stroke: internal-combustion engine is opened valve and is finished air inlet;
2) compression stroke: internal-combustion engine compresses the air inlet of described aspirating stroke and mixes the formation weak mixture with described primary fuel, and the fuel air ratio of described weak mixture is less than the chemical correct fuel air ratio of described primary fuel;
3) primary combustion stroke: described lean combustion and residual fraction high-temperature gas;
4) secondary compression stroke: internal-combustion engine compresses described high-temperature gas; 5) secondary combustion stroke: described secondary fuel mixes at this stroke and described high-temperature gas and is incorporated in this stroke spontaneous combustion acting;
6) exhaust stroke: internal-combustion engine is opened valve at this stroke and is finished exhaust;
Primary fuel described in this method and the secondary fuel summation and the fuel air ratio of the air inlet of described aspirating stroke are not more than the chemical correct fuel air ratio of primary fuel and secondary fuel mixing gained fuel.
Described first and second fuel is gasoline, and primary fuel is by ignition.
Described first and second fuel is diesel oil, the pressured spontaneous combustion of contracting of primary fuel.
Described first and second fuel is different fuel, and primary fuel is selected gasoline or diesel oil, and secondary fuel is at least a or rock gas in hydrous ethanol, the methyl alcohol.
Because 6-stroke IC engine secondary combustion method of work of the present invention proposes a work cycle of internal-combustion engine is divided into aspirating stroke, compression stroke, primary combustion stroke, secondary compression stroke, secondary combustion stroke and an exhaust stroke, therefore can realize an air inlet of internal-combustion engine, twice combustion; Again owing to be used for described one, the fuel summation of secondary combustion stroke and the fuel air ratio of the air inlet of described aspirating stroke are not more than the chemical correct fuel air ratio of primary fuel and secondary fuel mixing gained fuel, therefore above-mentioned work cycle is equivalent to change twice combustion in the primary combustion that does not change under the constant prerequisite of total amount of fuel and air inflow available engine, thereby the fuel and the Air mixing uniformity have been improved greatly, improved the combustion efficiency of fuel, solve the problem of combustion performance difference under the internal-combustion engine high load working condition, also reduced the discharging of harmful tail gas of internal-combustion engine simultaneously greatly.
Description of drawings
Fig. 1 is the principle flow chart of 6-stroke IC engine secondary combustion method of work of the present invention.
Embodiment
The embodiment 1 of 6-stroke IC engine secondary combustion method of work of the present invention, as shown in Figure 1, a work cycle of internal-combustion engine is divided into aspirating stroke 1, compression stroke 2, primary combustion stroke 3, secondary compression stroke 4, secondary combustion stroke 5 and an exhaust stroke 6 successively by the motion of internal combustion engine; Open and finish air inlet at the aspirating stroke internal combustion engine intake valve, internal-combustion engine sprays fueling for the first time to cylinder body when internal combustion engine is positioned at a compression stroke, the fuel that this spray adds is primary fuel, primary fuel adopts gasoline, the air inlet of described primary fuel and aspirating stroke mixes and forms weak mixture compression stroke, and the fuel air ratio of described weak mixture is less than the chemical correct fuel air ratio of gasoline; Described weak mixture is at acting of primary combustion stroke combustion and residual fraction high-temperature gas, and wherein the difference of first three stroke and existing four (six) stroke IC engines only is the minimizing of the amount of the fuel that the requirement spray adds in this method; Internal combustion engine compresses the residual high-temperature gas of primary combustion stroke at the secondary compression stroke, and moment that internal combustion engine leaves the top dead center of secondary combustion stroke 5 (certainly, in other embodiments, can also be at described secondary compression stroke) in internal combustion engine cylinders, spray for the second time fueling, the fuel that spray this time adds is secondary fuel, also adopts gasoline; Described secondary fuel is in secondary combustion stroke and high-temperature gas reaction and the spontaneous combustion compressed through the secondary compression stroke, thereby finish the secondary combustion acting, internal-combustion engine is opened valve in exhaust stroke and is finished exhaust, and so far the 6-stroke IC engine in this method work cycle finishes; The fuel air ratio of the air inlet of wherein said primary fuel and secondary fuel summation and described aspirating stroke is not more than the chemical correct fuel air ratio of gasoline; Certainly, during less than the fuel air ratio of gasoline, should at first consider to guarantee engine power performance at the fuel air ratio of the air inlet of described primary fuel and secondary fuel summation and described aspirating stroke.
The embodiment 2 of 6-stroke IC engine secondary combustion method of work of the present invention, as shown in Figure 1, a work cycle of internal-combustion engine is divided into aspirating stroke 1, compression stroke 2, primary combustion stroke 3, secondary compression stroke 4, secondary combustion stroke 5 and an exhaust stroke 6 successively by the motion of internal combustion engine; Present embodiment and embodiment's 1 difference only is: described once, secondary fuel all adopts diesel oil, the ignition mode of primary fuel is the compression autoignition a compression stroke; The air inlet of described primary fuel and aspirating stroke mixes and forms weak mixture compression stroke, and the fuel air ratio of described weak mixture is less than the chemical correct fuel air ratio of diesel oil; The fuel air ratio of the air inlet of described primary fuel and secondary fuel summation and described aspirating stroke is not more than the chemical correct fuel air ratio of diesel oil; Certainly, during less than the fuel air ratio of diesel oil, should at first consider to guarantee engine power performance at the fuel air ratio of the air inlet of described primary fuel and secondary fuel summation and described aspirating stroke.
The embodiment 3 of 6-stroke IC engine secondary combustion method of work of the present invention, as shown in Figure 1, a work cycle of internal-combustion engine is divided into aspirating stroke 1, compression stroke 2, primary combustion stroke 3, secondary compression stroke 4, secondary combustion stroke 5 and an exhaust stroke 6 successively by the motion of internal combustion engine; Present embodiment and embodiment's 1 difference only is: described primary fuel all adopts diesel oil, and described secondary fuel adopts hydrous ethanol, and the ignition mode of primary fuel is the compression autoignition a compression stroke; The air inlet of described primary fuel and aspirating stroke mixes and forms weak mixture compression stroke, and the fuel air ratio of described weak mixture is less than the chemical correct fuel air ratio of diesel oil; Described primary fuel and the secondary fuel summation and the fuel air ratio of the air inlet of described aspirating stroke are not more than the chemical correct fuel air ratio of diesel oil and hydrous ethanol mixing gained fuel; Certainly, during less than the fuel air ratio of diesel oil-hydrous ethanol fuel combination, should at first consider to guarantee engine power performance at the fuel air ratio of the air inlet of described primary fuel and secondary fuel summation and described aspirating stroke.
The embodiment 4 of 6-stroke IC engine secondary combustion method of work of the present invention, as shown in Figure 1, a work cycle of internal-combustion engine is divided into aspirating stroke 1, compression stroke 2, primary combustion stroke 3, secondary compression stroke 4, secondary combustion stroke 5 and an exhaust stroke 6 successively by the motion of internal combustion engine; Present embodiment and embodiment's 3 difference only is: described primary fuel all adopts gasoline, and described secondary fuel adopts hydrous ethanol, and the ignition mode of primary fuel is a firing mode; The air inlet of described primary fuel and aspirating stroke mixes and forms weak mixture compression stroke, and the fuel air ratio of described weak mixture is less than the chemical correct fuel air ratio of gasoline; Described primary fuel and the secondary fuel summation and the fuel air ratio of the air inlet of described aspirating stroke are not more than the chemical correct fuel air ratio of gasoline and hydrous ethanol mixing gained fuel; Certainly, during less than the fuel air ratio of gasoline-hydrous ethanol fuel combination, should at first consider to guarantee engine power performance at the fuel air ratio of the air inlet of described primary fuel and secondary fuel summation and described aspirating stroke.
In the foregoing description 3,4, described secondary fuel can also be hydrous ethanol and methanol mixture or rock gas.
Claims (4)
1. 6-stroke IC engine secondary combustion method of work, it is characterized in that: this method is divided into aspirating stroke, compression stroke, primary combustion stroke, secondary compression stroke, secondary combustion stroke and six strokes of exhaust stroke by internal combustion engine motion successively with a work cycle of internal-combustion engine, the fuel that wherein said primary combustion stroke uses is primary fuel, and the fuel that described secondary combustion stroke uses is secondary fuel; Described primary fuel sprays in the internal combustion engine cylinders in a described compression stroke, described secondary fuel leave at internal combustion engine described secondary combustion stroke top dead center the moment or spray in the internal combustion engine cylinders at described secondary compression stroke; The work of described six stroke correspondences is as follows:
1) aspirating stroke: internal-combustion engine is opened valve and is finished air inlet;
2) compression stroke: internal-combustion engine compresses the air inlet of described aspirating stroke and mixes the formation weak mixture with described primary fuel, and the fuel air ratio of described weak mixture is less than the chemical correct fuel air ratio of described primary fuel;
3) primary combustion stroke: described lean combustion and residual fraction high-temperature gas;
4) secondary compression stroke: internal-combustion engine compresses described high-temperature gas; 5) secondary combustion stroke: described secondary fuel mixes at this stroke and described high-temperature gas and is incorporated in this stroke spontaneous combustion acting;
6) exhaust stroke: internal-combustion engine is opened valve at this stroke and is finished exhaust;
Primary fuel described in this method and the secondary fuel summation and the fuel air ratio of the air inlet of described aspirating stroke are not more than the chemical correct fuel air ratio of primary fuel and secondary fuel mixing gained fuel.
2. 6-stroke IC engine secondary combustion method of work according to claim 1 is characterized in that: described first and second fuel is gasoline, and primary fuel is by ignition.
3. 6-stroke IC engine secondary combustion method of work according to claim 1 is characterized in that: described first and second fuel is diesel oil, the pressured spontaneous combustion of contracting of primary fuel.
4. 6-stroke IC engine secondary combustion method of work according to claim 1, it is characterized in that: described first and second fuel is different fuel, primary fuel is selected gasoline or diesel oil, and secondary fuel is at least a or rock gas in hydrous ethanol, the methyl alcohol.
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| CN2011101404117A CN102155311A (en) | 2011-05-27 | 2011-05-27 | Secondary combustion working method of six-stroke internal-combustion engine |
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| CN2011101404117A CN102155311A (en) | 2011-05-27 | 2011-05-27 | Secondary combustion working method of six-stroke internal-combustion engine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104005862A (en) * | 2014-05-30 | 2014-08-27 | 长城汽车股份有限公司 | Method and system for controlling internal combustion engine and vehicle |
| WO2017152997A1 (en) * | 2016-03-11 | 2017-09-14 | Volvo Truck Corporation | A method for operating an internal combustion piston engine |
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| US20020000209A1 (en) * | 2000-06-08 | 2002-01-03 | Hiromitsu Ando | Direct injection type internal combustion engine and controlling method therefor |
| US20040123822A1 (en) * | 2001-12-27 | 2004-07-01 | Alois Fuerhapter | Method of operating an internal combustion engine |
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| WO2010075165A1 (en) * | 2008-12-22 | 2010-07-01 | Caterpillar Inc. | Engine control system implementing lean burn 6-stroke cycle |
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| CN2398428Y (en) * | 1999-11-25 | 2000-09-27 | 赵生武 | Energy-saving pollution-reducing engine |
| US20020000209A1 (en) * | 2000-06-08 | 2002-01-03 | Hiromitsu Ando | Direct injection type internal combustion engine and controlling method therefor |
| CN1305053A (en) * | 2000-12-05 | 2001-07-25 | 贾平安 | 6-stroke IC engine |
| US20040123822A1 (en) * | 2001-12-27 | 2004-07-01 | Alois Fuerhapter | Method of operating an internal combustion engine |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104005862A (en) * | 2014-05-30 | 2014-08-27 | 长城汽车股份有限公司 | Method and system for controlling internal combustion engine and vehicle |
| WO2017152997A1 (en) * | 2016-03-11 | 2017-09-14 | Volvo Truck Corporation | A method for operating an internal combustion piston engine |
| WO2017153525A1 (en) * | 2016-03-11 | 2017-09-14 | Volvo Truck Corporation | A method for operating an internal combustion piston engine |
| CN108779723A (en) * | 2016-03-11 | 2018-11-09 | 沃尔沃卡车集团 | The method for running piston internal-combustion engine |
| CN108779723B (en) * | 2016-03-11 | 2022-04-22 | 沃尔沃卡车集团 | Method for operating a piston internal combustion engine |
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Application publication date: 20110817 |