CN112814742A - Air hybrid power homogeneous combustion two-stage expansion engine system and control method - Google Patents
Air hybrid power homogeneous combustion two-stage expansion engine system and control method Download PDFInfo
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 9
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 28
- 239000002912 waste gas Substances 0.000 claims description 35
- 239000007789 gas Substances 0.000 claims description 17
- 230000009471 action Effects 0.000 claims description 6
- 230000000750 progressive effect Effects 0.000 claims description 6
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 230000009467 reduction Effects 0.000 abstract description 2
- 239000000446 fuel Substances 0.000 description 7
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
- F01B21/00—Combinations of two or more machines or engines
- F01B21/02—Combinations of two or more machines or engines the machines or engines being all of reciprocating-piston type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
- F01B29/00—Machines or engines with pertinent characteristics other than those provided for in preceding main groups
- F01B29/08—Reciprocating-piston machines or engines not otherwise provided for
- F01B29/10—Engines
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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
- F02B41/00—Engines characterised by special means for improving conversion of heat or pressure energy into mechanical power
- F02B41/02—Engines with prolonged expansion
- F02B41/06—Engines with prolonged expansion in compound cylinders
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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
- F02B73/00—Combinations of two or more engines, not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B37/00—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00
- F04B37/10—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use
- F04B37/12—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use to obtain high pressure
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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 discloses an air hybrid homogeneous combustion two-stage expansion engine system and a control method thereof, wherein the system comprises the following steps: the system comprises a low-pressure cylinder, a high-pressure air tank and a pressure stabilizing chamber, wherein the low-pressure cylinder is connected with an air inlet channel of the low-pressure cylinder and an air outlet channel of the low-pressure cylinder; the control method comprises an aerodynamic mode, a pneumatic pump mode, a normal working mode and a parallel mode. The invention can switch the working mode according to the operating condition requirement of the engine so as to achieve the purposes of energy conservation and emission reduction.
Description
Technical Field
The invention relates to the field of engines, in particular to an air hybrid homogeneous combustion two-stage expansion engine system and a control method.
Background
The air power engine takes compressed air as a power source, can realize zero emission, has good performance at low speed and has the characteristics of low speed and large torque. However, the endurance of the aerodynamic engine is poor due to the influence of the capacity of the high-pressure air tank, and the performance of the aerodynamic engine is poor under the medium-high speed working condition. The fuel power engine has good cruising ability and higher fuel economy at medium and high speed. However, fuel consumption is high during idling, starting and acceleration, and a large amount of energy cannot be effectively utilized along with exhaust gas discharge.
Disclosure of Invention
In consideration of the limitations of the two engines, the invention provides an air hybrid homogeneous combustion two-stage expansion engine system and a control method thereof, which can switch the working mode according to the operating condition requirement of the engine so as to achieve the purposes of energy conservation and emission reduction.
The purpose of the invention can be realized by the following technical scheme.
The invention relates to an air hybrid power homogeneous combustion two-stage expansion engine system which comprises a low pressure cylinder, a high pressure air tank and a pressure stabilizing chamber, wherein the low pressure cylinder is connected with a low pressure cylinder air inlet channel and a low pressure cylinder air outlet channel; one port of the high-pressure air tank is connected with the low-pressure cylinder through a first high-pressure air passage, and the other port of the high-pressure air tank is connected with the pressure stabilizing chamber through a communicating pipe; one port of the pressure stabilizing chamber is connected with the high-pressure cylinder through a second high-pressure air passage, the other port of the pressure stabilizing chamber is connected with the pressure stabilizing chamber through a communicating pipe, and an oil sprayer is arranged in the second high-pressure air passage;
the low-pressure cylinder air inlet channel and the low-pressure cylinder are connected through a first air valve, the low-pressure cylinder exhaust channel and the low-pressure cylinder are connected through a second air valve, the waste gas air channel and the low-pressure cylinder are connected through a third air valve, the high-pressure air channel and the low-pressure cylinder are connected through a fourth air valve, and the high-pressure cylinder air inlet channel and the high-pressure cylinder are connected through a fifth air valve.
And a pressure reducing valve is arranged on the communicating pipe.
The purpose of the invention can be realized by the following technical scheme.
The invention relates to a control method of an air hybrid homogeneous combustion two-stage expansion engine system, which comprises the following four working modes:
the aerodynamic mode is as follows: in the starting stage, the high-pressure cylinder does not work, the low-pressure cylinder works as a two-stroke air power engine, and air in the high-pressure air tank is used as power; when air is fed, the first air valve, the second air valve and the third air valve are all closed, the fourth air valve is opened, and air in the high-pressure air tank flows out of the first high-pressure air passage and then enters the low-pressure cylinder to do work; when exhausting, the first valve and the third valve are kept closed, the fourth valve is closed, the second valve is opened, and air which does work in the low pressure cylinder is exhausted by the exhaust passage of the low pressure cylinder;
pneumatic pump mode: when braking, vehicle deceleration and downhill, the high-pressure cylinder does not work, the low-pressure cylinder works as an air compressor, and air sucked through an air inlet of the low-pressure cylinder is compressed into a high-pressure air tank; when air is fed, the second valve, the third valve and the fourth valve are all closed, the first valve is opened, and air enters the low-pressure cylinder from the air inlet channel of the low-pressure cylinder and is compressed; when exhausting, the second valve and the third valve are kept closed, the first valve is closed, the fourth valve is opened, and the compressed air in the low-pressure cylinder enters the high-pressure air tank from the first high-pressure air passage;
and (3) a normal working mode: when the vehicle normally runs, the low-pressure cylinder works as an air compressor and a secondary expansion cylinder, and the high-pressure cylinder works as a homogeneous progressive combustion four-stroke engine;
for the low pressure cylinder, firstly, a second valve, a third valve and a fourth valve are all closed, a first valve is opened, air enters the low pressure cylinder from an air inlet channel of the low pressure cylinder and then is compressed, then, the second valve and the third valve are kept closed, the first valve is closed, the fourth valve is opened, and the compressed air in the low pressure cylinder enters a high pressure air tank through a first high pressure air channel; in the next stroke, the first valve, the second valve and the fourth valve are closed, the third valve is opened, the waste gas in the high-pressure cylinder flows into the low-pressure cylinder through the waste gas air passage for secondary expansion, then the first valve, the third valve and the fourth valve are closed, the second valve is opened, and the waste gas after secondary expansion in the low-pressure cylinder is discharged from the exhaust passage of the low-pressure cylinder;
for the high-pressure cylinder, firstly, the third valve is closed, the fifth valve is opened, air flows into the high-pressure cylinder from the air inlet channel of the high-pressure cylinder and then is compressed, then the third valve and the fifth valve are closed, the compressed air enters the pressure stabilizing chamber through the second high-pressure air channel, a combustion stroke starts after a piston in the high-pressure cylinder reaches a top dead center, the third valve and the fifth valve are kept closed, the gas compressed in the pressure stabilizing chamber flows into the high-pressure cylinder through the second high-pressure air channel, the oil sprayer starts oil injection at the moment, homogeneous mixed gas is formed under the action of the compressed air and starts to burn, the next stroke, the fifth valve is kept closed, the third valve is opened, and waste gas flows into the low-pressure cylinder from the high-pressure cylinder through the waste;
parallel mode: when the vehicle is accelerated and runs under high load, the low-pressure cylinder works as an air power engine and a secondary expansion cylinder, and the high-pressure cylinder works as a homogeneous progressive combustion four-stroke engine;
for the low pressure cylinder, the first valve, the second valve and the third valve are closed, the fourth valve is opened, the air in the high pressure air tank flows out and enters the low pressure cylinder through the first high pressure air passage to do work, then the first valve and the third valve are kept closed, the fourth valve is closed, the second valve is opened, and the air which does work in the low pressure cylinder is discharged from the exhaust passage of the low pressure cylinder; in the next stroke, the first valve, the second valve and the fourth valve are closed, the third valve is opened, the waste gas in the high-pressure cylinder flows into the low-pressure cylinder through the waste gas air passage for secondary expansion, then the first valve, the third valve and the fourth valve are closed, the second valve is opened, and the waste gas after secondary expansion in the low-pressure cylinder is discharged from the exhaust passage of the low-pressure cylinder;
for the high pressure cylinder, firstly, the third valve is closed, the fifth valve is opened, air flows into the high pressure cylinder from the air inlet channel of the high pressure cylinder and is compressed, then the third valve and the fifth valve are closed, the compressed air enters the pressure stabilizing chamber through the second high pressure air channel, the combustion stroke starts after the piston in the high pressure cylinder reaches the top dead center, the third valve and the fifth valve are kept closed, the gas compressed in the pressure stabilizing chamber flows into the high pressure cylinder through the second high pressure air channel, the oil sprayer starts oil injection at the moment, homogeneous mixed gas is formed under the action of the compressed air and starts to combust, the next stroke, the fifth valve is kept closed, the third valve is opened, and waste gas flows into the low pressure cylinder from the high pressure cylinder through the waste gas channel.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
the invention combines the advantages of an air power engine and a fuel engine, and can flexibly adjust the working mode according to different working condition requirements.
(1) The low-pressure cylinder can be used as a compressor to work, so that the defect of poor endurance capacity of the aerodynamic engine is overcome;
(2) the low-pressure cylinder can perform secondary expansion on the waste gas, so that the energy loss of waste gas emission is reduced;
(3) the invention uses aerodynamic coupling under the working condition of low fuel economy, can effectively save fuel, save energy and reduce emission;
(4) according to the invention, the high-pressure cylinder adopts homogeneous asymptotic combustion, and the combustion process is controlled by gradually supplying homogeneous fuel, so that low emission and high efficiency are realized;
drawings
FIG. 1 is a schematic diagram of an engine system of the present invention.
Reference numerals: 1-low pressure cylinder inlet; 2-low pressure cylinder exhaust passage; 3-an exhaust gas duct; 4-a high pressure air duct; 5-second high pressure air flue; 6-high pressure cylinder inlet; 7-high pressure air tank; 8-oil injector; 9-low pressure cylinder; 10-high pressure cylinder; 11-communicating tube; 12-a plenum; 13-pressure relief valve.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, the air hybrid homogeneous combustion two-stage expansion engine system of the present invention includes a low pressure cylinder 9, a high pressure cylinder 10, a high pressure air tank 7 and a pressure stabilizing chamber 12, wherein pistons are disposed in both the low pressure cylinder 9 and the high pressure cylinder 10.
The low-pressure cylinder 9 is connected with a low-pressure cylinder air inlet channel 1 and a low-pressure cylinder air outlet channel 2, and the low-pressure cylinder air inlet channel 1 and the low-pressure cylinder air outlet channel 2 are respectively connected with an air inlet system and an air outlet system. The high-pressure cylinder 10 is connected with a high-pressure cylinder air inlet 6, and the high-pressure cylinder air inlet 6 is connected with an air inlet system. An exhaust gas duct 3 is connected between the low pressure cylinder 9 and the high pressure cylinder 10. One port of the high-pressure air tank 7 is connected with the low-pressure cylinder 9 through a first high-pressure air passage 4, and the other port of the high-pressure air tank is connected with a pressure stabilizing chamber 12 through a communicating pipe 11; one port of the pressure stabilizing chamber 12 is connected with the high-pressure cylinder 10 through a second high-pressure air passage 5, the other port of the pressure stabilizing chamber 12 is connected with a communicating pipe 11, and an oil sprayer 8 is arranged in the second high-pressure air passage 5. The communicating pipe 11 is provided with a pressure reducing valve 13, and the pressure in the pressure stabilizing chamber 12 is adjusted by opening and closing the pressure reducing valve 13.
Wherein, low pressure cylinder intake duct 1 and low pressure cylinder 9 junction are provided with the valve No. one, low pressure cylinder exhaust passage 2 and low pressure cylinder 9 junction are provided with the valve No. two, waste gas air flue 3 and low pressure cylinder 9 junction are provided with the valve No. three, a high-pressure air flue 4 and low pressure cylinder 9 junction are provided with the valve No. four, high pressure cylinder intake duct 6 and high pressure cylinder 10 junction are provided with the valve No. five.
The invention relates to a control method of an air hybrid homogeneous combustion two-stage expansion engine system, which comprises the following four working modes:
the aerodynamic mode is as follows: in the starting phase, the high-pressure cylinder 10 does not work, the low-pressure cylinder 9 works as a two-stroke air power engine, and air in the high-pressure air tank 7 serves as power. When air is fed, the first air valve, the second air valve and the third air valve are all closed, the fourth air valve is opened, and air in the high-pressure air tank 7 flows out to enter the low-pressure cylinder 9 to do work after passing through the first high-pressure air passage 4. When exhausting, the first valve and the third valve are kept closed, the fourth valve is closed, the second valve is opened, and the air which does work in the low-pressure cylinder 9 is exhausted from the low-pressure cylinder exhaust passage 2. The operation mode is shown in table 1:
TABLE 1
| Crank angle (° CA) | 0 | 180 |
| Low pressure cylinder | Doing work | Exhaust of gases |
Pneumatic pump mode: when braking, vehicle deceleration, and downhill, the high pressure cylinder 10 does not operate, the low pressure cylinder 9 operates as an air compressor, and air sucked through the low pressure cylinder intake duct 1 is compressed into the high pressure air tank 7. When air is fed, the second valve, the third valve and the fourth valve are all closed, the first valve is opened, and air enters the low-pressure cylinder 9 from the low-pressure cylinder air inlet channel 1 and is compressed. When exhausting, the second valve and the third valve are kept closed, the first valve is closed, the fourth valve is opened, and the compressed air in the low-pressure cylinder 9 enters the high-pressure air tank 7 from the first high-pressure air passage 4. The operation mode is shown in table 2:
TABLE 2
| Crank angle (° CA) | 0 | 180 |
| Low pressure cylinder | Intake air | Compression |
And (3) a normal working mode: when the vehicle is normally running, the low-pressure cylinder 9 works as an air compressor and a secondary expansion cylinder, and the high-pressure cylinder 10 works as a homogeneous progressive combustion four-stroke engine.
For the low pressure cylinder 9, firstly, the second valve, the third valve and the fourth valve are all closed, the first valve is opened, air enters the low pressure cylinder 9 from the low pressure cylinder air inlet channel 1 and is compressed, then, the second valve and the third valve are kept closed, the first valve is closed, the fourth valve is opened, and the compressed air in the low pressure cylinder 9 enters the high pressure air tank 7 through the first high pressure air channel 4. In the next stroke, the first valve, the second valve and the fourth valve are closed, the third valve is opened, the waste gas in the high-pressure cylinder 10 flows into the low-pressure cylinder 9 through the waste gas air passage 3 for secondary expansion, then the first valve, the third valve and the fourth valve are closed, the second valve is opened, and the waste gas after secondary expansion in the low-pressure cylinder 9 is discharged from the low-pressure cylinder exhaust passage 2.
For the high pressure cylinder 10, firstly, the third valve is closed, the fifth valve is opened, air flows into the high pressure cylinder 10 from the high pressure cylinder air inlet 6 and is compressed, then, the third valve and the fifth valve are closed, the compressed air enters the pressure stabilizing chamber 12 through the second high pressure air passage 5, a combustion stroke (primary expansion) is started after the piston in the high pressure cylinder 10 reaches the top dead center, the third valve and the fifth valve are kept closed, the compressed air in the pressure stabilizing chamber 12 flows into the high pressure cylinder 10 through the second high pressure air passage 5, at the moment, the oil injector 8 starts oil injection, a homogeneous mixed gas is formed under the action of the compressed air and starts to combust, the next stroke, the fifth valve is kept closed, the third valve is opened, and waste gas flows into the low pressure cylinder 9 from the high pressure cylinder 10 through the waste gas air passage 3. The operation mode is shown in table 3:
TABLE 3
| Crank angle (° CA) | 0 | 180 | 360 | 540 |
| Low pressure cylinder | Intake air | Compression | Second expansion | Exhaust of gases |
| High pressure cylinder | Compression | First expansion | Exhaust of gases | Intake air |
Parallel mode (also called acceleration mode): when the vehicle is accelerated and runs under high load, the low-pressure cylinder 9 works as an air power engine and a secondary expansion cylinder, and the high-pressure cylinder 10 works as a homogeneous progressive combustion four-stroke engine.
For the low pressure cylinder 9, the first valve, the second valve and the third valve are closed, the fourth valve is opened, the air in the high pressure air tank 7 flows out to enter the low pressure cylinder 9 through the first high pressure air passage 4 to do work, then the first valve and the third valve are kept closed, the fourth valve is closed, the second valve is opened, and the air which does work in the low pressure cylinder 9 is discharged from the low pressure cylinder exhaust passage 2. In the next stroke, the first valve, the second valve and the fourth valve are closed, the third valve is opened, the waste gas in the high-pressure cylinder 10 flows into the low-pressure cylinder 9 through the waste gas air passage 3 for secondary expansion, then the first valve, the third valve and the fourth valve are closed, the second valve is opened, and the waste gas after secondary expansion in the low-pressure cylinder 9 is discharged from the low-pressure cylinder exhaust passage 2.
For the high pressure cylinder 10, firstly, the third valve is closed, the fifth valve is opened, air flows into the high pressure cylinder 10 from the high pressure cylinder air inlet 6 and is compressed, then, the third valve and the fifth valve are closed, the compressed air enters the pressure stabilizing chamber 12 through the second high pressure air passage 5, a combustion stroke starts after a piston in the high pressure cylinder 10 reaches a top dead center, the third valve and the fifth valve are kept closed, the compressed air in the pressure stabilizing chamber 12 flows into the high pressure cylinder 10 through the second high pressure air passage 5, at the moment, the oil injector 8 starts injecting oil, a homogeneous mixed gas is formed under the action of the compressed air and starts to combust, the next stroke, the fifth valve is kept closed, the third valve is opened, and waste gas flows into the low pressure cylinder 9 from the high pressure cylinder 10 through the waste gas air passage 3. The operation mode is shown in table 4:
TABLE 4
| Crank angle (° CA) | 0 | 180 | 360 | 540 |
| Low pressure cylinder | Doing work | Exhaust of gases | Second expansion | Exhaust of gases |
| High pressure cylinder | Compression | First expansion | Exhaust of gases | Intake air |
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 (3)
1. The air hybrid homogeneous combustion two-stage expansion engine system is characterized by comprising a low pressure cylinder (9), a high pressure cylinder (10), a high pressure air tank (7) and a pressure stabilizing chamber (12), wherein the low pressure cylinder (9) is connected with a low pressure cylinder air inlet channel (1) and a low pressure cylinder air outlet channel (2), the high pressure cylinder (10) is connected with a high pressure cylinder air inlet channel (6), and a waste gas air channel (3) is connected between the low pressure cylinder (9) and the high pressure cylinder (10); one port of the high-pressure air tank (7) is connected with the low-pressure cylinder (9) through a first high-pressure air passage (4), and the other port of the high-pressure air tank is connected with a pressure stabilizing chamber (12) through a communicating pipe (11); one port of the pressure stabilizing chamber (12) is connected with the high-pressure cylinder (10) through a second high-pressure air passage (5), the other port of the pressure stabilizing chamber is connected with the pressure stabilizing chamber (12) through a communicating pipe (11), and an oil sprayer (8) is arranged in the second high-pressure air passage (5);
wherein, low pressure cylinder intake duct (1) and low pressure cylinder (9) junction are provided with the valve No. one, low pressure cylinder exhaust passage (2) and low pressure cylinder (9) junction are provided with the valve No. two, waste gas air flue (3) and low pressure cylinder (9) junction are provided with the valve No. three, high-pressure air flue (4) and low pressure cylinder (9) junction are provided with the valve No. four, high pressure cylinder intake duct (6) and high pressure cylinder (10) junction are provided with the valve No. five.
2. The air-hybrid homogeneous combustion two-stage expansion engine system according to claim 1, wherein a pressure reducing valve (13) is provided on the communicating pipe (11).
3. A method of controlling the air-hybrid homogeneous combustion two-stage expansion engine system according to claim 1 or 2, comprising the following four operating modes:
the aerodynamic mode is as follows: in the starting stage, the high-pressure cylinder does not work, the low-pressure cylinder (9) works as a two-stroke air power engine, and air in the high-pressure air tank (7) is used as power; when air enters, the first air valve, the second air valve and the third air valve are all closed, the fourth air valve is opened, and air in the high-pressure air tank (7) flows out to pass through the first high-pressure air passage (4) and then enters the low-pressure cylinder (9) to do work; when exhausting, the first valve and the third valve are kept closed, the fourth valve is closed, the second valve is opened, and air which does work in the low pressure cylinder (9) is exhausted by the low pressure cylinder exhaust passage (2);
pneumatic pump mode: when braking, vehicle deceleration and downhill, the high pressure cylinder (10) does not work, the low pressure cylinder (9) works as an air compressor, and air sucked through the low pressure cylinder air inlet channel (1) is retracted into the high pressure air tank (7); when air is fed, the second air valve, the third air valve and the fourth air valve are all closed, the first air valve is opened, and air enters the low-pressure cylinder (9) from the low-pressure cylinder air inlet channel (1) and is compressed; when exhausting, the second valve and the third valve are kept closed, the first valve is closed, the fourth valve is opened, and the compressed air in the low-pressure cylinder (9) enters the high-pressure air tank (7) from the first high-pressure air passage (4);
and (3) a normal working mode: when the vehicle normally runs, the low pressure cylinder (9) works as an air compressor and a secondary expansion cylinder, and the high pressure cylinder (10) works as a homogeneous progressive combustion four-stroke engine;
for the low pressure cylinder (9), firstly, a second valve, a third valve and a fourth valve are all closed, a first valve is opened, air enters the low pressure cylinder (9) from a low pressure cylinder air inlet channel (1) and then is compressed, then the second valve and the third valve are kept closed, the first valve is closed, the fourth valve is opened, and the compressed air in the low pressure cylinder (9) enters a high pressure air tank (7) through a first high pressure air channel (4); in the next stroke, the first valve, the second valve and the fourth valve are closed, the third valve is opened, the waste gas in the high pressure cylinder (10) flows into the low pressure cylinder (9) through the waste gas air passage (3) for secondary expansion, then the first valve, the third valve and the fourth valve are closed, the second valve is opened, and the waste gas after secondary expansion in the low pressure cylinder (9) is discharged from the low pressure cylinder exhaust passage (2);
for the high-pressure cylinder (10), firstly, a third valve is closed, a fifth valve is opened, air flows into the high-pressure cylinder (10) from a high-pressure cylinder air inlet passage (6) and then is compressed, then the third valve and the fifth valve are closed, the compressed air enters a pressure stabilizing chamber (12) through a second high-pressure air passage (5), a combustion stroke starts after a piston in the high-pressure cylinder (10) reaches an upper dead center, the third valve and the fifth valve are kept closed, the compressed air in the pressure stabilizing chamber (12) flows into the high-pressure cylinder (10) through the second high-pressure air passage (5), at the moment, an oil injector (8) starts to inject oil, a homogeneous mixed gas is formed under the action of the compressed air and starts to combust, the next stroke, the fifth valve is kept closed, the third valve is opened, and waste gas flows into the low-pressure cylinder (9) from the high-pressure cylinder (10) through a waste gas passage;
parallel mode: when the vehicle is accelerated and runs under high load, the low-pressure cylinder (9) works as an aerodynamic engine and a secondary expansion cylinder, and the high-pressure cylinder (10) works as a homogeneous progressive combustion four-stroke engine;
for the low pressure cylinder (9), the first valve, the second valve, the third valve are closed, the fourth valve is opened, the air in the high pressure air tank (7) flows out and enters the low pressure cylinder (9) through the first high pressure air passage (4) to do work, then the first valve and the third valve are kept closed, the fourth valve is closed, the second valve is opened, and the air after the work is done in the low pressure cylinder (9) is discharged from the low pressure cylinder exhaust passage (2); in the next stroke, the first valve, the second valve and the fourth valve are closed, the third valve is opened, the waste gas in the high pressure cylinder (10) flows into the low pressure cylinder (9) through the waste gas air passage (3) for secondary expansion, then the first valve, the third valve and the fourth valve are closed, the second valve is opened, and the waste gas after secondary expansion in the low pressure cylinder (9) is discharged from the low pressure cylinder exhaust passage (2);
for the high-pressure cylinder (10), firstly, a third valve is closed, a fifth valve is opened, air flows into the high-pressure cylinder (10) from a high-pressure cylinder air inlet passage (6) and then is compressed, then the third valve and the fifth valve are closed, the compressed air enters a pressure stabilizing chamber (12) through a second high-pressure air passage (5), a combustion stroke starts after a piston in the high-pressure cylinder (10) reaches an upper dead center, the third valve and the fifth valve are kept closed, the compressed air in the pressure stabilizing chamber (12) flows into the high-pressure cylinder (10) through the second high-pressure air passage (5), at the moment, an oil injector (8) starts to inject oil, homogeneous mixed gas is formed under the action of the compressed air and starts to combust, the next stroke, the fifth valve is kept closed, the third valve is opened, and waste gas flows into the low-pressure cylinder (9) from the high-pressure cylinder (10) through a waste gas passage (.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| US4321904A (en) * | 1978-10-11 | 1982-03-30 | Bristol Robert D | Internal combustion engine with auxiliary combustion chamber |
| CN1243562A (en) * | 1997-01-22 | 2000-02-02 | 居伊·内格尔 | Method and device for recuperating ambient thermal energy for vehicle equipped with a pollution-free engine with secondary compressed air |
| UY30565A1 (en) * | 2006-09-05 | 2008-01-31 | M D I Motor Dev Internat | ENHANCED ENGINE THAT OPERATES WITH COMPRESSED AIR OR GAS, AND / OR WITH ADDITIONAL ENERGY, THAT HAS AN ACTIVE EXPANSION CHAMBER. |
| CN101418716A (en) * | 2007-10-23 | 2009-04-29 | 赵元藩 | Highly effective integration heat engine |
| EP2108797A1 (en) * | 2008-04-07 | 2009-10-14 | Giulio Martinozzi | Low consumption internal combustion engine, incorporating a system for the super-expansion of the exhaust gases |
| CN103032156A (en) * | 2012-12-11 | 2013-04-10 | 浙江大学 | Expansion working medium energy multilevel utilization device for internal combustion engine and using method thereof |
| CN107035517A (en) * | 2016-02-03 | 2017-08-11 | 古长澍 | A kind of new work engine |
| CN214366211U (en) * | 2021-02-08 | 2021-10-08 | 天津大学 | Air hybrid homogeneous combustion two-stage expansion engine system |
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| CN112814742B (en) | 2023-10-31 |
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