CN111173615A - Two-stroke internal combustion engine and working method thereof - Google Patents
Two-stroke internal combustion engine and working method thereof Download PDFInfo
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- CN111173615A CN111173615A CN202010262922.5A CN202010262922A CN111173615A CN 111173615 A CN111173615 A CN 111173615A CN 202010262922 A CN202010262922 A CN 202010262922A CN 111173615 A CN111173615 A CN 111173615A
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- internal combustion
- combustion engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B25/00—Engines characterised by using fresh charge for scavenging cylinders
- F02B25/02—Engines characterised by using fresh charge for scavenging cylinders using unidirectional scavenging
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
- F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
- F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
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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)
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Abstract
The invention discloses a two-stroke internal combustion engine and a working method thereof. The internal combustion engine structure comprises a crankshaft, a crankcase, a piston ring, a cylinder, a connecting rod and an air supercharging device; the crankshaft is positioned in the crankcase, the piston is positioned in the cylinder, and the piston is connected with the crankshaft through a connecting rod; the top end of the cylinder is provided with an air inlet, the air inlet is provided with an air inlet valve, and the air inlet is connected with an air supercharging device through an air inlet pipeline; an exhaust port is arranged on the side wall of the cylinder, the position of the exhaust port on the side wall is between the top dead center and the bottom dead center, and an exhaust valve is arranged on the exhaust port. The invention has the beneficial effects that: the exhaust is thorough, the piston ring can not pass through the exhaust port on the side wall of the cylinder, the working stroke of the piston is larger than the compression stroke, the exhaust of the internal combustion engine can be reduced, and the efficiency of the internal combustion engine can be improved.
Description
Technical Field
The invention relates to the field of internal combustion engines, in particular to a two-stroke internal combustion engine and a working method thereof.
Background
Higher power and higher efficiency have been the direction of internal combustion engine development and progress. The traditional four-stroke internal combustion engine rotates for two circles in one working cycle and only does work once, so that the power performance of the traditional four-stroke internal combustion engine is not good. The power performance of the traditional two-stroke internal combustion engine is much better than that of a four-stroke internal combustion engine, but the traditional two-stroke internal combustion engine has insufficient exhaust gas, unburned fuel is easy to exhaust from an exhaust port, and the efficiency is not high and the hydrocarbon emission is high. In addition, the side wall of the cylinder of the traditional two-stroke internal combustion engine is provided with an air inlet and an air outlet, and an oil film on the piston ring is damaged in the process that the piston ring passes through the air inlet and the air outlet, so that the abrasion is serious and the engine oil consumption is large.
In order to deal with the increasingly severe environmental and energy problems, the gasoline-electric hybrid power is a main direction of the development of modern automobiles, and an internal combustion engine can be kept to run at a relatively stable rotating speed in a hybrid power system with the aid of an electric motor, so that the efficiency of the internal combustion engine is improved. The auxiliary of an electric system in hybrid power provides a new space for the development of an internal combustion engine, but the existing problem is that the mass of the whole vehicle is larger due to the larger mass of a battery and the installation of a traditional four-stroke internal combustion engine; the installation of a two-stroke internal combustion engine with higher power density is beneficial to reducing the mass of the whole vehicle, but the traditional two-stroke internal combustion engine has the problems of low efficiency and serious emission, and the application of the traditional two-stroke internal combustion engine is limited.
Disclosure of Invention
The invention aims to provide a two-stroke internal combustion engine and a working method thereof, which can overcome the problems that the exhaust gas of the traditional two-stroke internal combustion engine is insufficient and a piston ring passes through an air inlet and an air outlet, and can effectively improve the efficiency of the internal combustion engine because the working stroke is larger than the compression stroke.
The technical scheme of the invention is as follows: a two-stroke internal combustion engine is characterized by comprising a crankshaft, a crankcase, a piston ring, a cylinder, a connecting rod and an air supercharging device; the crankshaft is positioned in the crankcase, the piston is positioned in the cylinder, a piston ring is arranged on the piston, and the piston is connected with the crankshaft through a connecting rod; the top end of the cylinder is provided with an air inlet, the air inlet is provided with an air inlet valve, and the air inlet is connected with an air supercharging device through an air inlet pipeline; an exhaust port is arranged on the side wall of the cylinder, the position of the exhaust port on the side wall is between the top dead center and the bottom dead center, and an exhaust valve is arranged on the exhaust port.
Preferably, the length of the piston of the two-stroke internal combustion engine is greater than the distance from the exhaust port to the top dead center, the distance from the piston ring to the upper end of the piston is not less than the distance from the exhaust port to the top dead center, when the piston reaches the top dead center, the position of the piston ring is still lower than that of the exhaust port, and the piston ring cannot pass through the exhaust port in the operation process.
Preferably, a high-pressure air bag is arranged on the air inlet pipeline and close to the air inlet end, and the high-pressure air bag is used for caching high-pressure air.
Preferably, the two-stroke internal combustion engine is a direct injection engine, and the fuel injection nozzle is provided at the top of the cylinder.
Preferably, the two-stroke internal combustion engine has an injector in the intake conduit, the fuel being admitted to the cylinder with the high pressure air.
Preferably, the two-stroke internal combustion engine is a spark ignition engine with a spark plug at the top of the cylinder.
Preferably, the two-stroke internal combustion engine is a compression ignition engine.
Preferably, the air charging device is an electric turbocharger, an exhaust gas turbocharger or a mechanical turbocharger, or a combination thereof.
The invention also discloses a working method of the two-stroke internal combustion engine, and one working cycle of the two-stroke internal combustion engine comprises an exhaust compression stroke and a power stroke. The exhaust compression stroke is divided into two stages, exhaust and compression. In the exhaust stage, an exhaust valve is opened, and a piston runs from a bottom dead center to a certain position in front of a top dead center; in the exhaust phase, the inlet valve is opened and pressurized air is injected into the cylinder while sweeping exhaust gases out. In the compression stage, the exhaust valve is closed, the intake valve is closed, and the piston continues to run to the top dead center. In the power stroke, the air inlet valve and the exhaust valve are closed, the piston runs from the top dead center to the bottom dead center, and the exhaust valve is opened at the end of the power stroke. The fuel can be injected directly into the cylinder during the compression phase by means of injection nozzles or can be introduced into the cylinder with the high-pressure air. The ignition mode can be ignition at the end of the compression stroke by a spark plug or direct compression ignition through the compression stroke.
The invention has the beneficial effects that: the exhaust is thorough, the piston ring can not pass through the exhaust port on the side wall of the cylinder, the working stroke of the piston is greater than the compression stroke, the exhaust of the internal combustion engine can be reduced, and the efficiency of the internal combustion engine can be improved; one cycle has only two strokes, and the power performance is good.
Drawings
FIG. 1 is a schematic diagram of a two-stroke engine configuration according to an embodiment of the present invention. In the figure, 1 crankcase, 2 crankshaft, 3 connecting rod, 4 piston ring, 5 piston, 6 exhaust valve, 7 exhaust port, 8 fuel spray nozzle, 9 spark plug, 10 intake valve, 11 intake port, 12 high pressure air bag, 13 intake pipe, 14 air supercharging device and 15 cylinder.
Detailed Description
The invention will be further described with reference to the following figures and specific examples, but the scope of the invention is not limited thereto.
As shown in the figure, the two-stroke internal combustion engine comprises a crankshaft 2, a crankcase 1, a piston 5, a piston ring 4, a cylinder 15, a connecting rod 3 and an air supercharging device 14; the crankshaft 2 is positioned in the crankcase 1, the piston 5 is positioned in the cylinder 15, the piston 5 is provided with a piston ring 4, and the piston 5 is connected with the crankshaft 2 through a connecting rod 3; the top end of the cylinder 15 is provided with an air inlet 11, a spark plug 9 and an oil nozzle 8, and the air inlet 11 is provided with an air inlet valve 10; the air supercharging device 14 is connected with the air inlet 11 through an air inlet pipeline 13, and a high-pressure air bag 12 is arranged on the end, close to the air inlet 11, of the air inlet pipeline 13; the side wall of the cylinder 15 is provided with an exhaust port 7, and the exhaust port 7 is provided with an exhaust valve 6.
In this embodiment, the length of the piston 5 is greater than the distance from the exhaust port 7 to the top dead center, the distance from the piston ring 4 to the upper end of the piston 5 is not less than the distance from the exhaust port 7 to the top dead center, when the piston 5 reaches the top dead center, the position of the piston ring 4 is still lower than the position of the exhaust port 7, and the piston ring 4 does not pass through the exhaust port 7 in the operation process.
One working cycle of the two-stroke engine in this embodiment includes an exhaust compression stroke and a power stroke. The exhaust compression stroke is divided into two stages, exhaust and compression. And in the exhaust stage, the exhaust valve 6 is opened, the piston 5 runs to the position near the exhaust port 7 from the bottom dead center, the air inlet valve 10 is opened after the exhaust valve 6, high-pressure air is sprayed into the cylinder 15, and meanwhile, the exhaust gas in the cylinder 15 is swept out. During the compression phase, the inlet valve 10 and the outlet valve 6 are closed and the piston moves from near the position of the outlet 7 to the top dead centre. At the end of the compression phase, fuel is injected into the cylinder 15 from the injection nozzle 8 and the spark plug 9 ignites. In the power stroke, the inlet valve 10 and the outlet valve 6 are both closed and the piston 5 moves from top dead center to bottom dead center. At the end of the power stroke, the exhaust valve 6 is opened.
In this embodiment, the air charging device 14 is an electric and exhaust gas dual drive turbocharger. Before the engine is started, the turbocharger is driven by electric power to start in one step in advance. When the engine is in a low rotating speed range, the exhaust gas and the electric power jointly drive the turbocharger; in the medium and high speed interval, the exhaust gas alone drives the turbocharger.
The embodiment is a preferred embodiment of the present invention, and is not a limitation to the embodiment of the present invention. Any modification, variation or replacement of the above technical solutions according to the essence of the present invention still belongs to the protection scope of the technical solutions of the present invention.
Claims (9)
1. A two-stroke internal combustion engine is characterized by comprising a crankshaft, a crankcase, a piston, a cylinder, a connecting rod and an air supercharging device; the crankshaft is positioned in the crankcase, the piston is positioned in the cylinder, and the piston is connected with the crankshaft through a connecting rod; the top end of the cylinder is provided with an air inlet, the air inlet is provided with an air inlet valve, and the air inlet is connected with an air supercharging device through an air inlet pipeline; an exhaust port is arranged on the side wall of the cylinder, the position of the exhaust port on the side wall is between the top dead center and the bottom dead center, and an exhaust valve is arranged on the exhaust port.
2. A two-stroke internal combustion engine as claimed in claim 1 wherein the piston of the two-stroke engine has a length greater than the distance from the exhaust port to top dead centre, the piston ring is at a distance from the upper end of the piston no less than the distance from the exhaust port to top dead centre, and the piston ring is positioned lower than the exhaust port when the piston reaches top dead centre, such that the piston ring does not pass through the exhaust port during operation.
3. A two-stroke internal combustion engine as claimed in claim 1 wherein said intake conduit is provided with a high pressure bladder adjacent the inlet end for buffering high pressure air.
4. A two-stroke internal combustion engine as claimed in claim 1 wherein said two-stroke internal combustion engine is a direct in-cylinder injection engine having an injection nozzle at the top of the cylinder.
5. A two-stroke internal combustion engine as claimed in claim 1 wherein the inlet conduit is provided with fuel injectors for injecting fuel into the cylinder with the high pressure air.
6. A two-stroke internal combustion engine as claimed in claim 1 wherein the two-stroke internal combustion engine is a spark ignition engine having a spark plug at the top of the cylinder.
7. A two-stroke internal combustion engine as claimed in claim 1 wherein the two-stroke internal combustion engine is a compression ignition engine.
8. A two-stroke internal combustion engine as claimed in claim 1 wherein said air pressurizing means is an electric, exhaust or mechanical turbocharger or a combination thereof.
9. A method of operating a two-stroke internal combustion engine, which method is applicable to, but not limited to, the two-stroke internal combustion engine of claim 1, wherein: one duty cycle includes an exhaust compression stroke and a power stroke; the exhaust compression stroke is divided into two stages of exhaust and compression, wherein in the exhaust stage, an exhaust valve is opened, and a piston runs from a lower dead point to a certain position in front of an upper dead point; in the exhaust stage, an air inlet valve is opened, pressurized air is sprayed into an air cylinder, and meanwhile, waste gas is swept out; in the compression stage, an air inlet valve is closed, an air exhaust valve is closed, and a piston continues to run to the upper dead point; the working stroke, the air inlet valve and the exhaust valve are closed, the piston runs from the top dead center to the bottom dead center, and the exhaust valve is opened at the end of the working stroke; the fuel oil can be directly injected into the cylinder through an oil injection nozzle in the compression stage or enters the cylinder along with high-pressure air; the ignition mode can be ignition at the end of the compression stroke by a spark plug or direct compression ignition through the compression stroke.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2019112420213 | 2019-12-06 | ||
| CN201911242021.3A CN110905657A (en) | 2019-12-06 | 2019-12-06 | Two-stroke internal combustion engine and working method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN111173615A true CN111173615A (en) | 2020-05-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911242021.3A Pending CN110905657A (en) | 2019-12-06 | 2019-12-06 | Two-stroke internal combustion engine and working method thereof |
| CN202010262922.5A Pending CN111173615A (en) | 2019-12-06 | 2020-04-07 | Two-stroke internal combustion engine and working method thereof |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911242021.3A Pending CN110905657A (en) | 2019-12-06 | 2019-12-06 | Two-stroke internal combustion engine and working method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115030777A (en) * | 2022-07-04 | 2022-09-09 | 嘉兴腾狼智能科技有限公司 | Steam engine |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114382589B (en) * | 2021-12-23 | 2023-03-07 | 李国忠 | Ultrahigh-pressure air-intake oxygen-enriched combustion two-stroke internal combustion engine |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2199315Y (en) * | 1994-02-23 | 1995-05-31 | 王滨庆 | Top stop type two stroke IC engine |
| CN1180137A (en) * | 1996-09-01 | 1998-04-29 | 肖忠 | Fuel oil jet two-stroke petrol engine |
| WO1998038419A1 (en) * | 1997-02-28 | 1998-09-03 | Bimota S.P.A. | A direct electronic fuel injection system for two-stroke internal combustion engines |
| EP1041259A1 (en) * | 1999-03-29 | 2000-10-04 | Fuji Jukogyo Kabushiki Kaisha | Combustion chamber structure of in-cylinder direct fuel injection engine |
| CN202707229U (en) * | 2012-08-03 | 2013-01-30 | 符云 | Two-stroke high-efficiency internal combustion engine |
| CN203239443U (en) * | 2013-04-18 | 2013-10-16 | 曾深泳 | Novel two-stroke engine |
| CN204099043U (en) * | 2014-09-18 | 2015-01-14 | 石建民 | A kind of two stroke IC engine |
| CN110273777A (en) * | 2019-06-28 | 2019-09-24 | 重庆鑫源动力制造有限公司 | A kind of two-cycle engine of solenoid valve control |
-
2019
- 2019-12-06 CN CN201911242021.3A patent/CN110905657A/en active Pending
-
2020
- 2020-04-07 CN CN202010262922.5A patent/CN111173615A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2199315Y (en) * | 1994-02-23 | 1995-05-31 | 王滨庆 | Top stop type two stroke IC engine |
| CN1180137A (en) * | 1996-09-01 | 1998-04-29 | 肖忠 | Fuel oil jet two-stroke petrol engine |
| WO1998038419A1 (en) * | 1997-02-28 | 1998-09-03 | Bimota S.P.A. | A direct electronic fuel injection system for two-stroke internal combustion engines |
| EP1041259A1 (en) * | 1999-03-29 | 2000-10-04 | Fuji Jukogyo Kabushiki Kaisha | Combustion chamber structure of in-cylinder direct fuel injection engine |
| CN202707229U (en) * | 2012-08-03 | 2013-01-30 | 符云 | Two-stroke high-efficiency internal combustion engine |
| CN203239443U (en) * | 2013-04-18 | 2013-10-16 | 曾深泳 | Novel two-stroke engine |
| CN204099043U (en) * | 2014-09-18 | 2015-01-14 | 石建民 | A kind of two stroke IC engine |
| CN110273777A (en) * | 2019-06-28 | 2019-09-24 | 重庆鑫源动力制造有限公司 | A kind of two-cycle engine of solenoid valve control |
Non-Patent Citations (1)
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| 陈大年，杨义昌: "《内燃机基本原理》", 30 June 1965, 人民铁道出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115030777A (en) * | 2022-07-04 | 2022-09-09 | 嘉兴腾狼智能科技有限公司 | Steam engine |
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| CN110905657A (en) | 2020-03-24 |
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Application publication date: 20200519 |