CN102213134A - Engine-based method for realizing CAI (Controlled Auto Ignition) combustion through controllable exhaust back-pressure valve - Google Patents
Engine-based method for realizing CAI (Controlled Auto Ignition) combustion through controllable exhaust back-pressure valve Download PDFInfo
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- CN102213134A CN102213134A CN2011101556919A CN201110155691A CN102213134A CN 102213134 A CN102213134 A CN 102213134A CN 2011101556919 A CN2011101556919 A CN 2011101556919A CN 201110155691 A CN201110155691 A CN 201110155691A CN 102213134 A CN102213134 A CN 102213134A
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Abstract
The invention relates to an engine-based method for realizing CAI (Controlled Auto Ignition) combustion through a controllable exhaust back-pressure valve. 50 DEG CA VVT (Variable Valve Timing) is adopted to fully meet the internal residual exhaust gas conditions required by CAI combustion, at the same time, the exhaust back-pressure of an engine is increased, and the internal residual exhaust gas is forcedly retained in a cylinder to directly control the quantity of internal residual exhaust gas so as to control the CAI combustion load; and mixed gas in the cylinder is heated through re-suction of exhaust gas to increase the temperature of the mixed gas. The direct benefit of the increase of compression ratio lies in the improvement of fuel oil economy of the engine, meanwhile, with the adoption of high compression ratio, the temperature of mixed combustible gas before top dead center of compression can be further increased so as to be favorable for the realization of CAI combustion. In addition, by utilizing the EGR (Exhaust Gas Recirculation) strategy, the quantity of discharged NOX in the exhaust gas can also be reduced.
Description
Technical field
The invention belongs to the technical field of motor, be specifically related to a kind of by changing angle changing, exhaust back pressure and the compression ratio of VVT, the hot state of mixed gas in the control cylinder, thus realize the implementation method that CAI burns based on the controlled exhaust back pressure valve of motor CAI burning.
Background technique
The controlled spontaneous combustion of petrol engine (Controlled Auto Ignition, CAI) be that mixture by pressurized air, fuel (waste gas that comprises recirculation) is up to a kind of new combustion manner that catches fire, its essence is the comprehensive of diesel engine and two kinds of combustion manners of petrol engine, belong to improvement to combustion manner, having very high theoretical research is worth, being hot research in recent years, also is a kind of combustion manner that reaches its maturity.
At present, the main method that realizes the CAI burning both at home and abroad has: direct air inlet is heated, is adopted high compression ratio, uses the fuel of easier involuntary ignition, utilizes inner residual gas heating etc., and internal exhaust gas recirculation (EGR) strategy is considered to realize on the four-stroke gasoline engine one of the most feasible method that CAI burns.The basic thought of internal exhaust gas recirculation control petrol engine CAI combustion process is to catch a part of hot residual gas in cylinder by changing valve timing, uses its heating air inlet, finishes compression autoignition and catches fire.
According to the difference of valve control strategy and waste gas supply mode, the method for the realization CAI of internal exhaust gas recirculation burning mainly contains two kinds: a kind of be waste gas in Compression Strategies, another kind is that waste gas is heavily inhaled strategy.Waste gas recompression strategy is to utilize negative valve overlap (exhaust valve early closes with intake valve and opens evening), the residual gas of last cycling hot is stayed in the cylinder fresh charge with heats cold, make mixed gas near compression top center, reach the involuntary ignition temperature, realize the CAI burning.It is the waste gas that will discharge again again in the suction cylinder that waste gas is heavily inhaled strategy, and mainly contain two kinds of implementation methods: a kind of is to open exhaust valve in intake process, in the waste gas that discharges suction cylinder again; Another kind is that intake valve is opened in exhaust process, and a part of waste gas enters intake duct, in intake process again in the suction cylinder.
Control strategy at internal exhaust gas recirculation (i-EGR), VVT adopts the valve control strategy of inlet and outlet door plus lap angle in the existing direct fuel-injection engine technology platform of ChangAn Automobile company, but its internal EGR rate is 29% to the maximum, can not satisfy and realize the burn requirement of the minimum internal EGR rate in needed 40% left and right sides of CAI, can't realize the CAI burning.In addition, for the ICCS motor, by increasing the overlapping angle of inlet and exhaust valve, though can obtain a certain amount of inner residual gas, but be subjected to the restriction (the VVT phase place adjustment range of 30oCA) of cam profile and VVT angle changing, the simple variation that relies on the inlet and exhaust valve phase place can't obtain the inside residual gas of enough ratios, thereby can't reach the required condition of CAI burning that realizes.
Summary of the invention
The present invention provides a kind of by changing angle changing, exhaust back pressure and the compression ratio of VVT for solving the technical problem that exists in the prior art, mixed gas body heat state in the control cylinder, thus realize the implementation method that CAI burns based on the controlled exhaust back pressure valve of motor CAI burning.
The technological scheme that the present invention takes for the technical problem that exists in the solution prior art is:
Implementation method based on the controlled exhaust back pressure valve of motor CAI burning of the present invention may further comprise the steps: increasing compression ratio is to 11-15, to promote the realization of CAI burning; Increase the overlapping angle between engine intake valve and the exhaust valve, the angle changing of VVT is increased to 40-60 ° of CA; The part waste gas that a work cycle internal combustion on the motor is produced is drawn in the cylinder of motor again; By the exhaust back pressure of controlled back pressure valve change motor, the residual exhausted air quantity of control engine interior; In the cylinder of motor, spray into fuel oil, form burning mixture with inhaled air and waste gas; Mixed gas in the Piston Compression cylinder, inflammable mixture reach spontaneous ignition temperature and form the CAI burning before compression top center, and the promotion piston motion is outwards done work; Exhaust valve is opened, and cylinder discharges waste gas, and motor enters next work cycle.
The present invention can also adopt following technical measures:
Increase the overlapping angle of inlet and exhaust valve, realize reverting to take drugs of the interior residual gas of cylinder, under the certain situation of engine load, by Collaborative Control, to realize phase control to the CAI burning to exhaust back pressure and VVT phase place.
Advantage and good effect that the present invention has are:
In the implementation method based on the controlled exhaust back pressure valve of motor CAI burning of the present invention, the VVT that adopts 50oCA to change, fully satisfy the required inside residual gas condition of CAI burning, improve the exhaust back pressure of motor simultaneously, inner residual gas is forced to reside in the cylinder, can directly control inner residual gas amount, and then the load of control CAI burning, by the mixed gas in the waste heating cylinder in the cylinder of reverting to take drugs, improve the mixed gas temperature.The direct benefit that the raising compression ratio brings is to improve the fuel economy of motor, simultaneously, adopts big compression ratio, can further improve the temperature of the preceding inflammable mixture of compression top center, helps the realization of CAI burning.In addition, utilize the EGR strategy also to reduce nitrogen oxides (NO in the waste gas
X) discharge capacity.
Description of drawings
Fig. 1 is the process schematic representation of the implementation method based on the controlled exhaust back pressure valve of motor CAI burning of the present invention.
Embodiment
The present invention will be described in detail below in conjunction with drawings and Examples.
Fig. 1 is the process schematic representation of the implementation method based on the controlled exhaust back pressure valve of motor CAI burning of the present invention.
As shown in Figure 1, the implementation method based on the controlled exhaust back pressure valve of motor CAI burning of the present invention, may further comprise the steps: the intake valve of motor is opened, and sucks air in motor; Increase the overlapping angle between engine intake valve and the exhaust valve, the angle changing of VVT is increased to 50 ° of CA; The part waste gas that a workflow internal combustion on the motor is produced is drawn in the cylinder of motor again; By the exhaust back pressure of controlled back pressure valve change motor, the residual exhausted air quantity of control engine interior; In the cylinder of motor, spray into fuel oil, form mixed gas with inhaled air and waste gas; Mixed gas in the Piston Compression cylinder, the compression ratio to 13 of raising motor; Fuel mix gas in the cylinder is compressed into self-ignition point and forms the CAI burning, promotes piston motion, and motor outwards does work; Exhaust valve is opened, and cylinder discharges waste gas, and motor enters next workflow simultaneously.
Too high for avoiding phenomenon of detonation and preventing that the combustion temperature rising from also can cause NOx to discharge, motor can use the CAI combustion mode at middle-low load, burns or diesel combustion mode and change conventional spark-ignition over to when loading greatly or crossing low-load.
Increase the overlapping angle of inlet and exhaust valve, realize reverting to take drugs of the interior residual gas of cylinder, under the certain situation of engine load, by Collaborative Control, to realize phase control to the CAI burning to exhaust back pressure and VVT phase place.
In the implementation method based on the controlled exhaust back pressure valve of motor CAI burning of the present invention, the VVT that adopts 50oCA to change, fully satisfy the required inside residual gas condition of CAI burning, improve the exhaust back pressure of motor simultaneously, inner residual gas is forced to reside in the cylinder, can directly control inner residual gas amount, and then the load of control CAI burning, by the mixed gas in the waste heating cylinder in the cylinder of reverting to take drugs, improve the mixed gas temperature.The direct benefit that the raising compression ratio brings is to improve the fuel economy of motor, simultaneously, adopts big compression ratio, can further improve the temperature of the preceding inflammable mixture of compression top center, helps the realization of CAI burning.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention with preferred embodiment openly as above, yet, be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, certainly can utilize the technology contents of announcement to make a little change or modification, become the equivalent embodiment of equivalent variations, be the content that does not break away from technical solution of the present invention in every case, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all belong in the scope of technical solution of the present invention.
Claims (2)
1. implementation method based on the controlled exhaust back pressure valve of motor CAI burning, may further comprise the steps: increasing compression ratio is to 11-15, to promote the realization of CAI burning; Increase the overlapping angle between engine intake valve and the exhaust valve, the angle changing of VVT is increased to 40-60 ° of CA; The part waste gas that a work cycle internal combustion on the motor is produced is drawn in the cylinder of motor again; By the exhaust back pressure of controlled back pressure valve change motor, the residual exhausted air quantity of control engine interior; In the cylinder of motor, spray into fuel oil, form burning mixture with inhaled air and waste gas; Mixed gas in the Piston Compression cylinder, inflammable mixture reach spontaneous ignition temperature and form the CAI burning before compression top center, and the promotion piston motion is outwards done work; Exhaust valve is opened, and cylinder discharges waste gas, and motor enters next work cycle.
2. the implementation method based on the controlled exhaust back pressure valve of motor CAI burning according to claim 1, it is characterized in that: the overlapping angle that increases inlet and exhaust valve, realize reverting to take drugs of the interior residual gas of cylinder, under the certain situation of engine load, by Collaborative Control, to realize phase control to the CAI burning to exhaust back pressure and VVT phase place.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110155691.9A CN102213134B (en) | 2011-06-10 | 2011-06-10 | Based on the implementation method of engine controlled exhaust backpressure valve CAI burning |
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| CN201110155691.9A CN102213134B (en) | 2011-06-10 | 2011-06-10 | Based on the implementation method of engine controlled exhaust backpressure valve CAI burning |
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| CN102213134B CN102213134B (en) | 2016-05-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109819665A (en) * | 2016-09-09 | 2019-05-28 | 世倍特集团有限责任公司 | For controlling after scavenging period in the cylinder of internal combustion engine remaining residual gas quality and/or the method and apparatus for washing away air quality in the exhaust manifold for pouring internal combustion engine during scavenging period |
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| US7168396B1 (en) * | 2005-09-15 | 2007-01-30 | International Engine Intellectual Property Company, Llc | Variable compression ratio strategy for improving combustion processes in alternative combustion compression ignition engines |
| JP2009174432A (en) * | 2008-01-24 | 2009-08-06 | Mazda Motor Corp | Engine intake/exhaust control method and engine intake/exhaust control device |
| CN101761423A (en) * | 2010-01-22 | 2010-06-30 | 重庆长安汽车股份有限公司 | Composite exhaust gas recycling device for gasoline engine |
| CN101846001A (en) * | 2009-03-23 | 2010-09-29 | Dr.Ing.h.c.F.保时捷股份公司 | Internal combustion engine |
| JP2010216326A (en) * | 2009-03-16 | 2010-09-30 | Daihatsu Motor Co Ltd | Method for controlling switching of combustion method of internal combustion engine |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7168396B1 (en) * | 2005-09-15 | 2007-01-30 | International Engine Intellectual Property Company, Llc | Variable compression ratio strategy for improving combustion processes in alternative combustion compression ignition engines |
| JP2009174432A (en) * | 2008-01-24 | 2009-08-06 | Mazda Motor Corp | Engine intake/exhaust control method and engine intake/exhaust control device |
| JP2010216326A (en) * | 2009-03-16 | 2010-09-30 | Daihatsu Motor Co Ltd | Method for controlling switching of combustion method of internal combustion engine |
| CN101846001A (en) * | 2009-03-23 | 2010-09-29 | Dr.Ing.h.c.F.保时捷股份公司 | Internal combustion engine |
| CN101761423A (en) * | 2010-01-22 | 2010-06-30 | 重庆长安汽车股份有限公司 | Composite exhaust gas recycling device for gasoline engine |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109819665A (en) * | 2016-09-09 | 2019-05-28 | 世倍特集团有限责任公司 | For controlling after scavenging period in the cylinder of internal combustion engine remaining residual gas quality and/or the method and apparatus for washing away air quality in the exhaust manifold for pouring internal combustion engine during scavenging period |
| CN109819665B (en) * | 2016-09-09 | 2022-05-17 | 世倍特集团有限责任公司 | Method and device for controlling residual gas mass in cylinder and/or flushing air mass in exhaust manifold of internal combustion engine |
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| CN102213134B (en) | 2016-05-25 |
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