CN103670664A - Deep-pit gasoline direct injection engine piston top combustor - Google Patents
Deep-pit gasoline direct injection engine piston top combustor Download PDFInfo
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- CN103670664A CN103670664A CN201310654168.XA CN201310654168A CN103670664A CN 103670664 A CN103670664 A CN 103670664A CN 201310654168 A CN201310654168 A CN 201310654168A CN 103670664 A CN103670664 A CN 103670664A
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- pit
- firing chamber
- deep
- piston head
- dark pit
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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
Abstract
The invention relates to a deep-pit gasoline direct injection engine piston top combustor which is composed of a flow guiding groove, a deep-pit combustor body and a boss. The flow guiding groove is formed in the direction of a piston top oil injector and extends downwards to the top edge of the deep-pit combustor body from the top edge of a piston in an inclined mode. The boss is located at the top edge of the deep-pit combustor body at the position opposite to the flow guiding groove. By means of the combustor, gas flow speed in a deep pit can be reduced, effects of large-scale gas flow in the combustor on the gas flow speed in the deep pit are reduced, and fuel quantity in the deep pit can be kept. Mixed gas with the speed and the air-fuel ratio suitable for ignition can be formed near a sparking plug, an ignition window under the same injection timing is enlarged, stable ignition and fast combustion are achieved, and the combustion stability and fuel economy of an engine are improved.
Description
Technical field
The invention belongs to combustion system of engine technical field, particularly a kind of direct spray petrol engine in cylinder piston head firing chamber.
Background technique
Along with the continuous progress of gasoline in-cylinder direct fuel-injection engine technology, gasoline in-cylinder direct injection combustion system has also obtained fast development.Piston head firing chamber is the important component part of gasoline in-cylinder direct injection combustion system, and engine performance and burning are had to very large impact.The mixed gas organizational form of different combustion systems based on different, piston head shape also has very big difference.The TSI of Volkswagen combustion system of engine adopts shallow pot shape firing chamber to match with side oil sprayer; Toyota Motor Corporation adopts shell-like firing chamber to coordinate with gap nozzle; Mazda Sky-G motor adopts dark pit firing chamber to match with side multiple orifice nozzle.
In the pit of shallow firing chamber (shallow pot shape, shell-like firing chamber) mixed gas reserve capability a little less than, can not form stable stratified mixtures; Simple dark pit firing chamber, though have mixed gas hold facility, because aditus laryngis is less, if will make fuel oil spray in pit, must strictly control injection timing.
In cylinder, form stratified mixtures, denseer near spark plug, other positions are rarer, and igniting, burning and discharge are all beneficial to.Current combustion system or mixed gas hold facility are poor, or it is very strict that fuel oil is sprayed to timing events.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of can realization in the situation that of there is large scale air-flow in cylinder, near the suitable mixed gas of lighting of formation speed and air fuel ratio spark plug, increase the ignition window under same injection timing, realize stable ignition and rapid combustion, and then improve the dark pit direct spray petrol engine in cylinder piston head firing chamber of the fuel economy of combustion stability and motor.
In order to solve the problems of the technologies described above, dark pit direct spray petrol engine in cylinder piston head of the present invention firing chamber is comprised of guiding gutter, dark pit firing chamber and boss three parts; Described guiding gutter is positioned at piston head oil sprayer direction, and by the downward-sloping top that extends to dark pit firing chamber in piston head edge; Boss is positioned at the position relative with guiding gutter, dark pit top of combustion chamber edge.
The present invention adopts dark pit firing chamber, can reduce airspeed in dark pit, reduces the impact of large scale air-flow on airspeed in dark pit in firing chamber, and can keep the amount of fuel in dark pit, piston head arranges guiding gutter and boss, the fuel oil of oil sprayer ejection sprays to dark pit firing chamber along guiding gutter, part fuel oil blocks change direction through boss and flows into dark pit firing chamber, further increased the amount of fuel that sprays into dark pit, having reduced large scale air-flow in cylinder affects dark pit air-flow and mixed gas, make can form speed and the suitable mixed gas of lighting of air fuel ratio near spark plug, increased the ignition window under same injection timing, stable ignition and rapid combustion have been realized, and then the dark pit direct spray petrol engine in cylinder piston head firing chamber of having improved the fuel economy of combustion stability and motor.
The degree of depth of described dark pit firing chamber is more than or equal to aditus laryngis radius, is less than or equal to throat diameter.
The width of described boss is more than or equal to throat diameter, is less than or equal to 1.2 times of throat diameters.Can guarantee that the fuel oil being sprayed into by guiding gutter can all flow into dark pit firing chamber.
Spray in the amount of fuel of dark pit firing chamber and cylinder large scale air-flow directly related on dark pit firing chamber air-flow and the impact of mixed gas and the size of boss height, the suitable height of boss is 2～5mm.
Different according to piston diameter, other parameters of combustion system are different, and the guiding gutter gradient, subtended angle, boss height etc. are not identical yet.
The gradient angle of described guiding gutter is preferably 5～8 degree, can guarantee that the fuel oil that sprays to guiding gutter all enters dark pit firing chamber, and piston surface area increases little.
The subtended angle of described guiding gutter is preferably 30～35 degree, can guarantee that the fuel oil that sprays to guiding gutter all enters dark pit firing chamber.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is the longitudinal profile schematic diagram of dark pit direct spray petrol engine in cylinder piston head of the present invention firing chamber.
Fig. 2 is the plan view of dark pit direct spray petrol engine in cylinder piston head of the present invention firing chamber.
1: guiding gutter; 2: dark pit firing chamber; 3: boss; 4, boss height; 5, dark pit combustion-chamber depth; 6, dark pit firing chamber waist diameter; 7: guiding gutter gradient angle; 8: throat diameter; 9: guiding gutter angle; 10: piston diameter;
Embodiment
As shown in Figure 1, dark pit direct spray petrol engine in cylinder piston head of the present invention firing chamber is comprised of guiding gutter 1, dark pit firing chamber 2 and boss 3 three parts; Described guiding gutter 1 is positioned at piston head oil sprayer direction, and by the downward-sloping top that extends to dark pit firing chamber 2 in piston head edge; Boss 3 is positioned at the 2 top position relative with guiding gutter 1, dark pit firing chamber.
Embodiment 1
Little cylinder diameter piston head design proposal.The piston head that is 60-70mm for piston diameter, the height 4 of boss 3 is 2.5-3.5mm, the width 10 of boss 3 is 18-25.2mm; The throat diameter 8 of dark pit firing chamber 2 is 18-21mm, and waist diameter 6 is 18-22mm, and the degree of depth 5 of dark pit firing chamber 2 is 9-21mm, and gradient angle 7 is 5-8 degree, and the angle 9 of guiding gutter 1 is 30-35 degree.
Adopt the little cylinder diameter piston engine of the present embodiment, by optimizing quality of mixing gas mixture in cylinder, improve fuel economy, especially improve conventional in the fuel economy of high rotating speed middle and high load working condition.
Embodiment 2
Medium cylinder diameter piston head design proposal.The piston head that is 70-80mm for piston diameter, the height 4 of boss 3 is 3.5-4.5mm, the width 10 of boss 3 is 19-26.4mm; The throat diameter 8 of dark pit firing chamber 2 is 19-22mm, and waist diameter 6 is 19-24mm, and the degree of depth 5 of dark pit firing chamber 2 is 9.5-22mm, and gradient angle 7 is 5-8 degree, and the angle 9 of guiding gutter 1 is 30-35 degree.
Adopt the medium cylinder diameter piston engine of the present embodiment, by optimizing quality of mixing gas mixture in cylinder, improve combustion stability, accelerate warming-up process, reduce discharge.
Embodiment 3
Larger cylinder diameter piston head design proposal.The piston head that is 80-90mm for piston diameter, the height 4 of boss 3 is 4-5mm, the width 10 of boss 3 is 21-30mm; The throat diameter 8 of dark pit firing chamber 2 is 21-25mm, and waist diameter 6 is 21-27mm, and the degree of depth 5 of dark pit firing chamber 2 is 10.5-25mm, and gradient angle 7 is 5-8 degree, and the angle 9 of guiding gutter 1 is 30-35 degree.
Adopt the larger cylinder diameter piston engine of the present embodiment, by optimizing quality of mixing gas mixture in cylinder, improve fuel economy; At idling operation, improve quality of mixing gas mixture, reduce idling operation circulating fuel injection quantity, further improve fuel economy; Accelerate warming-up process, reduce discharge.
Claims (6)
1. a dark pit direct spray petrol engine in cylinder piston head firing chamber, is characterized in that being comprised of guiding gutter (1), dark pit firing chamber (2) and boss (3) three parts; Described guiding gutter (1) is positioned at piston head oil sprayer direction, and by the downward-sloping top that extends to dark pit firing chamber (2) in piston head edge; Boss (3) is positioned at dark pit firing chamber (2) the top position relative with guiding gutter (1).
2. dark pit direct spray petrol engine in cylinder piston head according to claim 1 firing chamber, is characterized in that the degree of depth of described dark pit firing chamber (2) is more than or equal to aditus laryngis radius, is less than or equal to throat diameter.
3. dark pit direct spray petrol engine in cylinder piston head according to claim 1 firing chamber, is characterized in that the width of described boss (3) is more than or equal to throat diameter, is less than or equal to 1.2 times of throat diameters.
4. dark pit direct spray petrol engine in cylinder piston head according to claim 1 firing chamber, the height that it is characterized in that described boss (3) is 2～5mm.
5. dark pit direct spray petrol engine in cylinder piston head according to claim 1 firing chamber, the gradient angle that it is characterized in that described guiding gutter (1) is 5～8 degree.
6. dark pit direct spray petrol engine in cylinder piston head according to claim 1 firing chamber, the subtended angle that it is characterized in that described guiding gutter (1) is 30～35 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310654168.XA CN103670664B (en) | 2013-12-05 | 2013-12-05 | Dark pit direct spray petrol engine in cylinder piston head firing chamber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310654168.XA CN103670664B (en) | 2013-12-05 | 2013-12-05 | Dark pit direct spray petrol engine in cylinder piston head firing chamber |
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| Publication Number | Publication Date |
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| CN103670664A true CN103670664A (en) | 2014-03-26 |
| CN103670664B CN103670664B (en) | 2016-01-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310654168.XA Active CN103670664B (en) | 2013-12-05 | 2013-12-05 | Dark pit direct spray petrol engine in cylinder piston head firing chamber |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106321276A (en) * | 2016-08-31 | 2017-01-11 | 中国第汽车股份有限公司 | Piston used for 1L direct injection gasoline engine spherical combustion chamber |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05240052A (en) * | 1992-02-27 | 1993-09-17 | Toyota Motor Corp | Cylinder injection type internal combustion engine |
| DE19603119A1 (en) * | 1995-01-30 | 1996-08-01 | Aisin Seiki | Combustion chamber for diesel engine with indirect injection |
| JP2002285846A (en) * | 2001-03-27 | 2002-10-03 | Nissan Diesel Motor Co Ltd | Indirect diesel engine |
| CN203050906U (en) * | 2013-01-06 | 2013-07-10 | 重庆长安汽车股份有限公司 | Cylinder inside direct-injection gasoline-engine piston |
| CN203669993U (en) * | 2013-12-05 | 2014-06-25 | 中国第一汽车股份有限公司 | Deep pit combustor on top of piston of gasoline direct injection engine |
-
2013
- 2013-12-05 CN CN201310654168.XA patent/CN103670664B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05240052A (en) * | 1992-02-27 | 1993-09-17 | Toyota Motor Corp | Cylinder injection type internal combustion engine |
| DE19603119A1 (en) * | 1995-01-30 | 1996-08-01 | Aisin Seiki | Combustion chamber for diesel engine with indirect injection |
| JP2002285846A (en) * | 2001-03-27 | 2002-10-03 | Nissan Diesel Motor Co Ltd | Indirect diesel engine |
| CN203050906U (en) * | 2013-01-06 | 2013-07-10 | 重庆长安汽车股份有限公司 | Cylinder inside direct-injection gasoline-engine piston |
| CN203669993U (en) * | 2013-12-05 | 2014-06-25 | 中国第一汽车股份有限公司 | Deep pit combustor on top of piston of gasoline direct injection engine |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106321276A (en) * | 2016-08-31 | 2017-01-11 | 中国第汽车股份有限公司 | Piston used for 1L direct injection gasoline engine spherical combustion chamber |
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| CN103670664B (en) | 2016-01-20 |
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