CN111336002A - Device and method for recycling backflow gas in compression process of Miller cycle engine - Google Patents
Device and method for recycling backflow gas in compression process of Miller cycle engine Download PDFInfo
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- CN111336002A CN111336002A CN202010193185.8A CN202010193185A CN111336002A CN 111336002 A CN111336002 A CN 111336002A CN 202010193185 A CN202010193185 A CN 202010193185A CN 111336002 A CN111336002 A CN 111336002A
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000007906 compression Methods 0.000 title claims abstract description 20
- 238000004064 recycling Methods 0.000 title claims description 4
- 230000008569 process Effects 0.000 claims description 22
- 230000009471 action Effects 0.000 claims description 8
- 238000002485 combustion reaction Methods 0.000 abstract 1
- 230000004044 response Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
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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
- F02B33/00—Engines characterised by provision of pumps for charging or scavenging
- F02B33/44—Passages conducting the charge from the pump to the engine inlet, e.g. reservoirs
- F02B33/446—Passages conducting the charge from the pump to the engine inlet, e.g. reservoirs having valves for admission of atmospheric air to engine, e.g. at starting
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
- F02D41/0007—Controlling intake air for control of turbo-charged or super-charged engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
- F02M35/10026—Plenum chambers
- F02M35/10052—Plenum chambers special shapes or arrangements of plenum chambers; Constructional details
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
- F02M35/10026—Plenum chambers
- F02M35/10065—Valves arranged in the plenum chamber
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/10091—Air intakes; Induction systems characterised by details of intake ducts: shapes; connections; arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/10209—Fluid connections to the air intake system; their arrangement of pipes, valves or the like
- F02M35/10229—Fluid connections to the air intake system; their arrangement of pipes, valves or the like the intake system acting as a vacuum or overpressure source for auxiliary devices, e.g. brake systems; Vacuum chambers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/10242—Devices or means connected to or integrated into air intakes; Air intakes combined with other engine or vehicle parts
- F02M35/10255—Arrangements of valves; Multi-way valves
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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)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The invention discloses a device and a method for recovering backflow gas in the compression process of a Miller cycle engine, and the device comprises a pipeline A and a pipeline B, wherein the air inlet of the pipeline A is respectively connected with each air inlet manifold, each air inlet is provided with a cover plate, the air outlet of the pipeline A is connected with an air storage tank, and the air outlet is provided with a valve A; the air inlet of the pipeline B is connected with the air storage tank, the air outlet of the pipeline B is connected with the air inlet main pipe, the air inlet of the pipeline B is provided with a valve B, and the air outlet of the pipeline B is provided with a valve C. The invention uses the part of gas pressed back to the air inlet in the upward compression process of the piston for compensation when the gas supply is not matched or gas braking of a diesel vehicle, thereby not only reducing the back pressure of the inlet gas of the gas compressor, but also improving the combustion of the engine.
Description
Technical Field
The invention belongs to the field of engines, and particularly relates to a device and a method for recovering backflow gas in a compression process of a Miller cycle engine.
Background
Due to the fact that the intake valve of the diesel engine adopting the Miller cycle is closed late, in the upward compression process of the piston, a part of intake air is pressed back to the intake passage in the process that the intake valve is not closed yet, and the back pressure of the air compressor is increased by the part of intake air, so that the intake air of the next cycle is not facilitated. Due to the compressibility of the gas, the long gas circulation loop, the slow response of the turbine and other factors, in the actual working process, if the opening degree of the accelerator is suddenly increased, the gas supply is often not well matched with the diesel oil supply.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a device and a method for recovering backflow gas in the compression process of a Miller cycle engine.
The purpose of the invention can be realized by the following technical scheme.
The device for recovering the backflow gas in the compression process of the Miller cycle engine comprises a pipeline A and a pipeline B, wherein the air inlet of the pipeline A is respectively connected with each air inlet manifold, a cover plate is arranged at each air inlet of the pipeline A, the air outlet of the pipeline A is connected with an air storage tank, and the air outlet of the pipeline A is provided with a valve A;
the air inlet and the gas storage tank of pipeline B are connected, the gas vent and the air inlet main pipe of pipeline B are connected, the air inlet of pipeline B is provided with valve B, the gas vent of pipeline B is provided with valve C.
The air storage tank is provided with a pressure relief valve and a pressure sensor, and the pressure relief valve, the pressure sensor, the valve A, the valve B and the valve C are all electrically connected with the ECU.
The cover plate is designed to be a curved surface, the opening and closing of the cover plate are controlled through the gas flowing direction, the cover plate is fixed after being rotated and opened to a certain angle in the air inlet manifold under the flowing action of backflow gas of the cylinder, the backflow gas is blocked from flowing to the air inlet manifold, the backflow gas enters the pipeline A, and enters the air storage tank through the valve A to be stored.
The purpose of the invention can be realized by the following technical scheme.
The invention discloses a method for recovering backflow gas in the compression process of a Miller cycle engine, which comprises the following steps:
1) when the air inlet process of the engine is started, the valve A is closed, air enters the cylinder from the air inlet main pipe and the air inlet manifold through the air inlet valve, and the cover plate is pressed and closed due to the fact that the air flow moves towards the interior of the cylinder;
2) in the air intake process of the engine, an accelerator position sensor monitors the position of an accelerator in real time, when the opening of the accelerator is suddenly increased, a valve B and a valve C are opened, and gas stored in a gas storage tank enters an air intake main pipe through a pipeline B; otherwise, the valve B and the valve C are in a closed state;
3) starting the compression process of the engine, opening the valve A, and closing the valve B and the valve C; at the moment, partial gas in the cylinder is pressed back to the gas inlet manifold because the gas inlet valve is not closed, the cover plate rotates and opens to a certain angle in the gas inlet manifold under the flowing action of the backflow gas and is fixed, the backflow gas is blocked from flowing to the gas inlet manifold continuously, and the backflow gas enters the pipeline A and enters the gas storage tank through the valve A to be stored; when the gas backflow process is basically finished, the gas flow is weakened and is not enough to keep the cover plate open, the cover plate falls down under the action of the gravity of the cover plate, the gas inlet of the pipeline A is covered, and the gas backflow collection process is finished;
4) after the gas backflow collection process, the gas with certain pressure stored in the gas storage tank is used for compensating gas inlet in the gas inlet process or used for gas braking of a diesel vehicle; a pressure sensor is arranged in the gas storage tank to monitor the pressure in the tank in real time, and if the pressure of the gas in the tank reaches the opening pressure of the pressure release valve, the pressure release valve is opened to reduce the pressure in the tank to a reasonable level; otherwise the relief valve should be normally closed.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
the invention can recover the gas which flows back due to the late closing of the inlet valve in the compression process, on one hand, the invention collects the gas which flows back into the inlet manifold due to the late closing of the inlet valve of the Miller cycle, thereby reducing the back pressure of the inlet gas of the compressor; on one hand, the gas can be compensated during gas inlet, and the problem of slow response of gas supply is relieved to a certain extent; in addition, the part of the gas can be used for air braking of diesel vehicles.
Drawings
FIG. 1 is a schematic diagram of the device for recovering the return gas in the compression process of the Miller cycle engine according to the present invention.
Reference numerals: 1-pipeline A, 2-cover plate, 3-valve A, 4-gas storage tank, 5-pressure release valve, 6-valve B, 7-pipeline B, 8-valve C, 9-gas inlet manifold, 10-gas inlet manifold, 11-gas exhaust pipe, 12-cylinder, C-compressor and T-turbine.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in FIG. 1, the device for recovering the return gas in the compression process of the Miller cycle engine comprises a pipeline A1 and a pipeline B7. The air inlet of the pipeline A1 is respectively connected with each air inlet manifold 10, one air inlet manifold 10 is connected with one air cylinder 12, and each air inlet of the pipeline A1 is provided with a cover plate 2. The exhaust port of the pipeline A1 is connected with the air storage tank 4, and the exhaust port of the pipeline A1 is provided with a valve A3. The cover plate 2 is designed to be a curved surface, the opening and closing of the cover plate are controlled through the gas flowing direction, the cover plate is rotated and opened to a certain angle under the flowing action of backflow gas of the cylinder 12 and then is fixed, the backflow gas is blocked from flowing to the intake manifold 10, the backflow gas enters the pipeline A1 and enters the gas storage tank 4 through the valve A3 to be stored.
The air inlet and the gas holder 4 of pipeline B7 are connected, the gas vent and the air intake manifold 9 of pipeline B7 are connected, the air inlet of pipeline B7 is provided with valve B6, the gas vent of pipeline B7 is provided with valve C8.
The air storage tank 4 is provided with a pressure relief valve 5 and a pressure sensor, and the pressure relief valve 5, the pressure sensor, a valve a3, a valve B6 and a valve C8 are all electrically connected with an ECU (Electronic Control Unit). The ECU, the valve A3, the valve B6 and the valve C8 form a control execution system, and the opening and closing of the valves can be controlled, so that the recycling and reusing of return gas are better realized. The valve A3, the valve B6 and the valve C8 are all solenoid valves controlled by an ECU.
The device for recovering the backflow gas in the compression process of the Miller cycle engine has the following specific working process:
1) when the air inlet process of the engine is started, the valve A3 is closed, the air enters the cylinder 12 from the air inlet manifold 9 and the air inlet manifold 10 through the air inlet valve, the cover plate 2 is pressed and closed because the air flows into the cylinder 12, and at the moment, the air is not collected into the air storage tank 4.
2) In the air intake process of the engine, the position of an accelerator is monitored by an accelerator position sensor in real time, when the opening degree of the accelerator is suddenly increased (namely the opening degree of the accelerator is increased by more than 20% of the full opening degree of the accelerator at one time), a valve B6 and a valve C8 are opened, and gas stored in a gas storage tank 4 enters an air intake manifold 9 through a pipeline B7; otherwise, the valves B6 and C8 should be in the closed state. Wherein, throttle position sensor is connected with ECU electricity. Valve a3 is in the closed state.
3) The engine compression process is started, the valve A3 is opened, the valve B6 and the valve C8 are closed, and the gas backflow collection and storage process is carried out. At this time, some gas in the cylinder 12 is pressed back to the intake manifold 10 because the intake valve is not closed yet, the cover plate 2 is fixed after rotating and opening to a certain angle towards the intake manifold 10 under the flowing action of the backflow gas, the backflow gas is blocked from flowing towards the intake manifold 10, and the backflow gas enters the pipeline A1 and enters the gas storage tank 4 through the valve A3 to be stored. When the gas return process is substantially completed, the gas flow becomes weak and is insufficient to keep the lid 2 open, the lid 2 falls by its own weight to cover the gas inlet of the duct a1 (i.e. the connection port of the duct a1 to the intake manifold 10), and the gas return collection process is completed.
4) Through the gas backflow collection process, the gas with certain pressure stored in the gas storage tank 4 can be used for compensating gas inflow in the gas inflow process or used for a gas brake of a diesel vehicle. A pressure sensor is arranged in the gas storage tank 4 to monitor the pressure in the tank in real time, and if the gas pressure in the gas storage tank 4 reaches the opening pressure of the pressure release valve 5, the pressure release valve 5 is opened to reduce the pressure in the gas storage tank 4 to a reasonable level; otherwise the pressure relief valve 5 should be normally closed. The reasonable level of the pressure in the gas storage tank 4 and the opening pressure of the pressure relief valve 5 are different from engine to engine, and the quantification of specific numerical values is not carried out in consideration of wide matching.
While the present invention has been described in terms of its functions and operations with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise functions and operations described above, and that the above-described embodiments are illustrative rather than restrictive, and that various changes and modifications may be effected therein by one skilled in the art without departing from the scope or spirit of the invention as defined by the appended claims.
Claims (4)
1. A device for recycling backflow gas in the compression process of a Miller cycle engine comprises a pipeline A (1) and a pipeline B (7), and is characterized in that an air inlet of the pipeline A (1) is respectively connected with each air inlet manifold (10), a cover plate (2) is arranged at each air inlet of the pipeline A (1), an air outlet of the pipeline A (1) is connected with an air storage tank (4), and a valve A (3) is arranged at the air outlet of the pipeline A (1);
the air inlet and the gas holder (4) of pipeline B (7) are connected, the gas vent and the inlet manifold (9) of pipeline B (7) are connected, the air inlet of pipeline B (7) is provided with valve B (6), the gas vent of pipeline B (7) is provided with valve C (8).
2. The device for recovering the backflow gas in the compression process of the Miller cycle engine as claimed in claim 1, wherein the gas storage tank (4) is provided with a pressure relief valve (5) and a pressure sensor, and the pressure relief valve (5), the pressure sensor, the valve A (3), the valve B (6) and the valve C (8) are all electrically connected with the ECU.
3. The device for recovering the backflow gas in the compression process of the Miller cycle engine according to claim 1, wherein the cover plate (2) is designed into a curved surface, the opening and closing of the cover plate are controlled by the gas flow direction, the cover plate is rotated and opened to a certain angle in the intake manifold (10) under the flowing action of the backflow gas of the cylinder (12) and then fixed, the backflow gas is blocked from flowing to the intake manifold (10), and the backflow gas enters the pipeline A (1) and enters the gas storage tank (4) through the valve A (3) to be stored.
4. A method of recovering scavenged gas from the compression process of a miller cycle engine, comprising the steps of:
1) when the air inlet process of the engine is started, the valve A (3) is closed, air enters the cylinder (12) from the air inlet main pipe (9) and the air inlet manifold (10) through the air inlet valve, and the cover plate (2) is pressed and closed due to the fact that air flow moves towards the inside of the cylinder;
2) in the air intake process of the engine, an accelerator position sensor monitors the position of an accelerator in real time, when the opening of the accelerator is suddenly increased, a valve B (6) and a valve C (8) are opened, and gas stored in a gas storage tank (4) enters an air intake main pipe (9) through a pipeline B (7); otherwise, the valve B (6) and the valve C (8) are in a closed state;
3) starting the compression process of the engine, opening a valve A (3), and closing a valve B (6) and a valve C (8); at the moment, partial gas in the cylinder (12) is pressed back to the air inlet manifold (10) because the air inlet valve is not closed, the cover plate (2) rotates and opens to a certain angle in the air inlet manifold (10) under the flowing action of the backflow gas and is fixed, the backflow gas is blocked from continuously flowing to the air inlet manifold (10), and the backflow gas enters the pipeline A (1) and enters the air storage tank (4) through the valve A (3) to be stored; when the gas backflow process is basically finished, the gas flow is weakened and is not enough to keep the cover plate (2) open, the cover plate (2) falls down due to the self-gravity action to cover the gas inlet of the pipeline A (1), and the gas backflow collection process is finished;
4) after the gas backflow collection process, the gas with certain pressure stored in the gas storage tank (4) is used for compensating gas inlet in the gas inlet process or used for gas braking of a diesel vehicle; a pressure sensor is arranged in the gas storage tank (4) to monitor the pressure in the tank in real time, and if the gas pressure in the tank reaches the opening pressure of the pressure release valve (5), the pressure release valve (5) is opened to reduce the pressure in the tank to a reasonable level; otherwise, the pressure relief valve (5) is in a normally closed state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010193185.8A CN111336002A (en) | 2020-03-18 | 2020-03-18 | Device and method for recycling backflow gas in compression process of Miller cycle engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010193185.8A CN111336002A (en) | 2020-03-18 | 2020-03-18 | Device and method for recycling backflow gas in compression process of Miller cycle engine |
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| Publication Number | Publication Date |
|---|---|
| CN111336002A true CN111336002A (en) | 2020-06-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010193185.8A Pending CN111336002A (en) | 2020-03-18 | 2020-03-18 | Device and method for recycling backflow gas in compression process of Miller cycle engine |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100307440A1 (en) * | 2008-02-28 | 2010-12-09 | Brunel University | Engine for an Air Hybrid Vehicle |
| CN212027926U (en) * | 2020-03-18 | 2020-11-27 | 天津大学 | Device for recovering backflow gas in compression process of Miller cycle engine |
-
2020
- 2020-03-18 CN CN202010193185.8A patent/CN111336002A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100307440A1 (en) * | 2008-02-28 | 2010-12-09 | Brunel University | Engine for an Air Hybrid Vehicle |
| CN212027926U (en) * | 2020-03-18 | 2020-11-27 | 天津大学 | Device for recovering backflow gas in compression process of Miller cycle engine |
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Application publication date: 20200626 |