CN104791146A - Gas inlet and exhausting system of internal combustion engine - Google Patents
Gas inlet and exhausting system of internal combustion engine Download PDFInfo
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- CN104791146A CN104791146A CN201510118628.6A CN201510118628A CN104791146A CN 104791146 A CN104791146 A CN 104791146A CN 201510118628 A CN201510118628 A CN 201510118628A CN 104791146 A CN104791146 A CN 104791146A
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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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Abstract
The invention relates to the field of internal combustion engines, in particular to a turbocharging internal combustion engine adopting the EGR technology, and discloses a gas inlet and exhausting system of the internal combustion engine. The gas inlet and exhausting system of the internal combustion engine comprises a gas compressor, a turbine, an air cylinder, a gas inlet pipe, an exhaust manifold, an exhaust pipe, a rear exhaust pipe and other components, wherein the exhaust manifold is provided with an exhaust manifold valve, the gas inlet pipe, the exhaust manifold and the rear exhaust pipe are connected through a tee-joint pipe, and a tee-joint pipe valve is arranged in the tee-joint pipe. The invention further provides a control method of the gas inlet and exhausting system of the internal combustion engine. The gas inlet and exhausting system of the internal combustion engine can improve the EGR rate of the engine, conveniently and flexibly control the EGR rate and simplify the structure of a supercharger.
Description
Technical field
The present invention relates to field of internal combustion engine, especially adopt the turbocharging internal-combustion engines of EGR Technology (EGR), specifically a kind of air inlet system and exhaust system and controlling method thereof that can realize controlled EGR and pressure ratio.
Background technique
The fuel economy and the reduction pollutant emission that improve internal-combustion engine are devoted in internal-combustion engine research and development always, and EGR (EGR) and turbosupercharging are all its conventional technological means.EGR(gas recirculation system) again to be introduced in cylinder of internal-combustion engine by the exhaust that burning is produced and participate in burning, can effective control cylinder combustion process, adjustment motor discharges and oil consumption; Turbocharging technology then participates in burning by utilizing waste gas to promote turbine acting to provide more fresh air, improves engine power density, improves engine power performance and fuel economy.EGR and turbocharging technology are all closely related with the air inlet system and exhaust system of motor.
To traditional combustion engine, after which employs EGR and turbocharging technology, its air inlet system and exhaust system more complicated, EGR rate realize scope low, be not easy control.The arrangement of usual EGR for get gas before turbine, and waste gas enters engine aspirating system after this air hatch flows through EGR control valve, intercooler.Combustion motor performance has a significant impact EGR rate (i.e. waste gas and fresh air quantity ratio), is one of key issue of EGR technology.Due to response characteristic complicated between EGR control valve and EGR waste gas streams flux and the strong coupling relation between EGR rate and turbo charge system, usual employing open-loop control method controls EGR rate, the signals such as the engine speed namely gathered by it by Engine ECU, load, fuel injection quantity look into the EGR valve aperture MAP getting and be stored in ECU, then export to actuator.But open-loop control method cannot fully take into account the multiple parameters affecting EGR rate, therefore it is difficult to realize precisely controlling to EGR rate.In addition, when the EGR rate of combustion system calls is larger, the exhaust energy flowing through turbine is not enough, causing turbocharger supercharged than reducing, must adopt complicated two-stage turbocharging or pressure booster with variable cross section etc. for this reason, adding internal-combustion engine cost of production.
To traditional combustion engine, in order to control supercharger ratio and adapt to the internal-combustion engine range of flow comparatively broad relative to turbosupercharger, turbosupercharger must increase exhaust vent valve usually, do not exceed internal combustion (IC) Engine Design intensity limit value with the pressure ratio and control high-speed region pressure ratio that improve low-speed region.
Summary of the invention
The object of the invention is in order to solve above-mentioned the deficiencies in the prior art, a kind of internal combustion (IC) engine air-inlet-exhaust system and controlling method thereof to be provided, can engine EGR rate to be improved, convenient, flexible control EGR rate, simplify supercharger structure.
A kind of internal combustion (IC) engine air-inlet-exhaust system provided by the invention, comprise gas compressor, turbine, cylinder and three-way pipe, the air outlet of described gas compressor is connected with cylinder by suction tude, described cylinder is connected with outlet pipe by gas exhaust manifold, described gas exhaust manifold is provided with gas exhaust manifold valve, described outlet pipe is connected with the suction port of turbine, and the relief opening of described turbine is connected with final vacuum pipe; Described three-way pipe comprises arm I, arm II and arm III, described arm I is connected with suction tude, described arm II is connected with gas exhaust manifold and arm II is positioned at the upstream of gas exhaust manifold valve with the link position of gas exhaust manifold, described arm III is connected with final vacuum pipe, is provided with any one or more three-way pipe valve can closed in arm I, arm II or arm III in described three-way pipe.
Technological scheme of the present invention also has: described cylinder has six.
Technological scheme of the present invention also has: described arm I is provided with one-way valve, for preventing exhaust gas recirculation.
Technological scheme of the present invention also has: described arm I is provided with heat exchanger, for cooled exhaust air.
Technological scheme of the present invention also has: described heat exchanger is positioned at the downstream of one-way valve.
The controlling method of a kind of internal combustion engine exhaust system provided by the invention: when motor is in high load (external characteristics) operating mode, under this operating mode, the discharge amount of engine nitrogen oxide is high, and the discharge amount of soot is low, after-treatment system is very large to the processing load of oxynitrides, need very high EGR rate, under high EGR rate, the waste gas entering turbosupercharger is entered suction tude by drainage, so pressure ratio is comparatively moderate, turbine does not exceed the speed limit.Gas exhaust manifold valve is partially or completely closed, to increase the pressure of waste gas, control three-way tube valve goalkeeper arm I to be communicated with arm II, close arm III, waste gas enters suction tude through arm II and arm I, enter cylinder after waste gas mixes with fresh air and participate in combustion process, reduce the discharge amount of oxynitrides.
When motor is in middle and high load working condition, under this operating mode, motor oxynitride discharge amount is higher, and carbon smoke exhaust amount is relatively low, the processing load of after-treatment system to oxynitrides is larger, in order to the discharge amount of the oxynitrides and soot that regulate and control motor, need the EGR rate under this operating mode of appropriateness adjustment, to reduce oxynitride discharge.Because required EGR rate is lower, therefore under this operating mode, gas exhaust manifold valve is opened completely, do not carry out waste gas throttling, control three-way tube valve goalkeeper arm I to be communicated with arm II, close arm III, waste gas enters suction tude through arm II and arm I, enters cylinder and participates in combustion process, reduce the discharge amount of oxynitrides after waste gas mixes with fresh air.
When motor is in moderate duty operating mode, under this operating mode, engine nitrogen oxide and carbon smoke exhaust amount are all comparatively mated with after-treatment system, so do not need to regulate and control the discharge amount of oxynitrides and soot, namely do not need EGR.Now the pressure ratio of turbine is higher, and rotating speed is very fast, in order to reduce pressure ratio, opened completely by gas exhaust manifold valve, control three-way tube valve goalkeeper arm I and close, arm II is communicated with the bypass line forming final vacuum pipe with arm III, because portion is by bypass, pressure ratio is controlled.
When motor is in middle-low load working condition, under this operating mode, engine nitrogen oxide and carbon smoke exhaust amount are all comparatively mated with after-treatment system, so do not need to regulate and control the discharge amount of oxynitrides and soot, namely do not need EGR.Because engine load is middle low-level, so exhaust energy is limited, the pressure ratio of turbine is lower, does not need exhaust gas bypass to control pressure ratio, is therefore opened completely by gas exhaust manifold valve, controls three-way tube valve goalkeeper arm I, arm II and arm III and closes.
Technological scheme of the present invention also has: can need to control one or more cylinder according to motor and enter corresponding states.
Relative to prior art, the beneficial effect of internal combustion (IC) engine air-inlet-exhaust system of the present invention is: 1, for the shortcoming (being usually less than 30%) that conventional turbine supercharged engine EGR rate is lower, introduce gas exhaust manifold valve, high EGR rate (can 100% be realized in theory) can be realized; 2, EGR rate controls convenient, flexible, can close according to engine operation demand or open the three-way pipe valve of one or more cylinder, realize the combination of multiple EGR rate; 3, triplate line can perform the function of turbosupercharger exhaust vent valve, reduces the complexity of turbosupercharger, reduces taking up room of cost of production and turbosupercharger.
Accompanying drawing explanation
Fig. 1 is the structural representation of internal combustion (IC) engine air-inlet-exhaust system of the present invention.
In figure: 1, gas compressor, 2, turbine, 3, cylinder, 4, suction tude, 5, gas exhaust manifold, 6, outlet pipe, 7, final vacuum pipe, 8, gas exhaust manifold valve, 9, arm I, 10, arm II, 11, arm III, 12, three-way pipe valve, 13, one-way valve, 14, heat exchanger.
Embodiment
For the technical characterstic of this programme can be clearly demonstrated, with reference to the accompanying drawings the specific embodiment of the invention is described further below.
As shown in Figure 1, a kind of internal combustion (IC) engine air-inlet-exhaust system, comprise gas compressor 1, turbine 2, cylinder 3 and three-way pipe, described cylinder 3 has three, the air outlet of described gas compressor 1 is connected with cylinder 3 by suction tude 4, and described cylinder 3 is connected with outlet pipe 6 by gas exhaust manifold 5, and described gas exhaust manifold 5 is provided with gas exhaust manifold valve 8, described outlet pipe 6 is connected with the suction port of turbine 2, and the relief opening of described turbine 2 is connected with final vacuum pipe 7; Described three-way pipe comprises arm I 9, arm II 10 and arm III 11, described arm I 9 is connected with suction tude 4, arm I 9 is provided with one-way valve 13 and heat exchanger 14, described heat exchanger 14 is positioned at the downstream of one-way valve 13, described arm II 10 is connected with gas exhaust manifold 5 and arm II 10 is positioned at the upstream of gas exhaust manifold valve 8 with the link position of gas exhaust manifold 5, described arm III 11 is connected with final vacuum pipe 7, is provided with any one or more three-way pipe valve 12 can closed in arm I 9, arm II 10 or arm III 11 in described three-way pipe.
The controlling method of a kind of internal combustion engine exhaust system provided by the invention: when motor is in high load (external characteristics) operating mode, under this operating mode, the discharge amount of engine nitrogen oxide is high, and the discharge amount of soot is low, after-treatment system is very large to the processing load of oxynitrides, need very high EGR rate, under high EGR rate, the waste gas entering turbosupercharger 2 is entered suction tude 4 by drainage, so pressure ratio is comparatively moderate, turbine does not exceed the speed limit.Gas exhaust manifold valve 8 is partially or completely closed, to increase the pressure of waste gas, control three-way pipe valve 12 arm I 9 is communicated with arm II 10, close arm III 11, waste gas enters suction tude 4 through arm II 10 and arm I 9, enter cylinder 3 after waste gas mixes with fresh air and participate in combustion process, reduce the discharge amount of oxynitrides.Can need to control one or more cylinder 3 according to motor and enter this state.
When motor is in middle and high load working condition, under this operating mode, motor oxynitride discharge amount is higher, and carbon smoke exhaust amount is relatively low, the processing load of after-treatment system to oxynitrides is larger, in order to the discharge amount of the oxynitrides and soot that regulate and control motor, need the EGR rate under this operating mode of appropriateness adjustment, to reduce oxynitride discharge.Because required EGR rate is lower, therefore under this operating mode, gas exhaust manifold valve 8 is opened completely, do not carry out waste gas throttling, control three-way pipe valve 12 arm I 9 is communicated with arm II 10, close arm III 11, waste gas enters suction tude 4 through arm II 10 and arm I 9, enters cylinder 3 and participate in combustion process after waste gas mixes with fresh air, reduces the discharge amount of oxynitrides.Can need to control one or more cylinder 3 according to motor and enter this state.
When motor is in moderate duty operating mode, under this operating mode, engine nitrogen oxide and carbon smoke exhaust amount are all comparatively mated with after-treatment system, so do not need to regulate and control the discharge amount of oxynitrides and soot, namely do not need EGR.Now the pressure ratio of turbine 2 is higher, rotating speed is very fast, in order to reduce pressure ratio, gas exhaust manifold valve 8 is opened completely, control three-way pipe valve 12 arm I 9 is closed, arm II 10 is communicated with the bypass line forming final vacuum pipe 7 with arm III 11, because portion is by bypass, pressure ratio is controlled.Can need to control one or more cylinder 3 according to motor and enter this state.
When motor is in middle-low load working condition, under this operating mode, engine nitrogen oxide and carbon smoke exhaust amount are all comparatively mated with after-treatment system, so do not need to regulate and control the discharge amount of oxynitrides and soot, namely do not need EGR.Because engine load is middle low-level, so exhaust energy is limited, the pressure ratio of turbine 2 is lower, does not need exhaust gas bypass to control pressure ratio, therefore gas exhaust manifold valve 8 is opened completely, control three-way pipe valve 12 and arm I 9, arm II 10 and arm III 11 are closed.Can need to control one or more cylinder 3 according to motor and enter this state.
By reference to the accompanying drawings embodiments of the invention are elaborated above, but the present invention is not limited to above-described embodiment, in the ken that those of ordinary skill in the art possess, can also makes a variety of changes under the prerequisite not departing from present inventive concept.
Claims (8)
1. an internal combustion (IC) engine air-inlet-exhaust system, comprise gas compressor (1), turbine (2) and cylinder (3), the air outlet of described gas compressor (1) is connected with cylinder (3) by suction tude (4), described cylinder (3) is connected with outlet pipe (6) by gas exhaust manifold (5), described outlet pipe (6) is connected with the suction port of turbine (2), the relief opening of described turbine (2) is connected with final vacuum pipe (7), it is characterized in that: described gas exhaust manifold (5) is provided with gas exhaust manifold valve (8); Also comprise three-way pipe, described three-way pipe comprises arm I (9), arm II (10) and arm III (11), described arm I (9) is connected with suction tude (4), described arm II (10) is connected with gas exhaust manifold (5) and arm II (10) is positioned at the upstream of gas exhaust manifold valve (8) with the link position of gas exhaust manifold (5), described arm III (11) is connected with final vacuum pipe (7), is provided with any one or more three-way pipe valve (12) can closed in arm I (9), arm II (10) or arm III (11) in described three-way pipe.
2. internal combustion (IC) engine air-inlet-exhaust system according to claim 1, is characterized in that: described cylinder (3) has six.
3. internal combustion (IC) engine air-inlet-exhaust system according to claim 1 and 2, is characterized in that: described arm I (9) is provided with one-way valve (13).
4. internal combustion (IC) engine air-inlet-exhaust system according to claim 1 and 2, is characterized in that: described arm I (9) is provided with heat exchanger (14).
5. internal combustion (IC) engine air-inlet-exhaust system according to claim 3, is characterized in that: described arm I (9) is provided with heat exchanger (14).
6. internal combustion (IC) engine air-inlet-exhaust system according to claim 5, is characterized in that: described heat exchanger (14) is positioned at the downstream of one-way valve (13).
7. one kind as arbitrary in claim 1-6 as described in the controlling method of internal combustion (IC) engine air-inlet-exhaust system, it is characterized in that: when motor is in high load operating mode, gas exhaust manifold valve (8) is partially or completely closed, control three-way pipe valve (12) arm I (9) is communicated with arm II (10), close arm III (11); When motor is in middle and high load working condition, gas exhaust manifold valve (8) is opened completely, control three-way pipe valve (12) and arm I (9) is communicated with arm II (10), close arm III (11); When motor is in moderate duty operating mode, opened completely by gas exhaust manifold valve (8), control three-way pipe valve (12) and closed by arm I (9), arm II (10) is communicated with arm III (11); When motor is in middle-low load working condition, gas exhaust manifold valve (8) is opened completely, control three-way pipe valve (12) and arm I (9), arm II (10) and arm III (11) are closed.
8. internal combustion (IC) engine air-inlet-exhaust system according to claim 7, is characterized in that: can need to control one or more cylinder (3) according to motor and enter corresponding states.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510118628.6A CN104791146A (en) | 2015-03-18 | 2015-03-18 | Gas inlet and exhausting system of internal combustion engine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510118628.6A CN104791146A (en) | 2015-03-18 | 2015-03-18 | Gas inlet and exhausting system of internal combustion engine |
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| CN104791146A true CN104791146A (en) | 2015-07-22 |
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| CN201510118628.6A Pending CN104791146A (en) | 2015-03-18 | 2015-03-18 | Gas inlet and exhausting system of internal combustion engine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105041513A (en) * | 2015-09-02 | 2015-11-11 | 康跃科技股份有限公司 | Special EGR system for diesel engine |
| CN105089863A (en) * | 2015-09-10 | 2015-11-25 | 谢晓宇 | Exhaust recirculation device for multi-cylinder and four-stroke internal combustion engine |
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| JP2013164055A (en) * | 2012-02-13 | 2013-08-22 | Isuzu Motors Ltd | Diesel engine |
| CN103470408A (en) * | 2013-09-23 | 2013-12-25 | 中国船舶重工集团公司第七一一研究所 | EGR (Exhaust Gas Recirculation) system used for marine medium-speed diesel engine |
| CN104358627A (en) * | 2014-11-04 | 2015-02-18 | 哈尔滨工程大学 | Ship diesel engine NOx and Sox combined emission reduction device and control method |
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2015
- 2015-03-18 CN CN201510118628.6A patent/CN104791146A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1906391A (en) * | 2004-07-09 | 2007-01-31 | 丰田自动车株式会社 | Exhaust gas control apparatus for internal combustion engine |
| CN101709662A (en) * | 2009-12-21 | 2010-05-19 | 奇瑞汽车股份有限公司 | Diesel engine exhausting after-treatment device and treatment method thereof |
| JP2013164055A (en) * | 2012-02-13 | 2013-08-22 | Isuzu Motors Ltd | Diesel engine |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105041513A (en) * | 2015-09-02 | 2015-11-11 | 康跃科技股份有限公司 | Special EGR system for diesel engine |
| CN105041513B (en) * | 2015-09-02 | 2018-02-06 | 康跃科技股份有限公司 | Special egr system for diesel engine |
| CN105089863A (en) * | 2015-09-10 | 2015-11-25 | 谢晓宇 | Exhaust recirculation device for multi-cylinder and four-stroke internal combustion engine |
| CN105089863B (en) * | 2015-09-10 | 2024-03-29 | 谢晓宇 | Exhaust gas recirculation device of multi-cylinder four-stroke internal combustion engine |
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