CN102937057A - Engine EGR (exhaust gas recirculation) system - Google Patents
Engine EGR (exhaust gas recirculation) system Download PDFInfo
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- CN102937057A CN102937057A CN2012104199072A CN201210419907A CN102937057A CN 102937057 A CN102937057 A CN 102937057A CN 2012104199072 A CN2012104199072 A CN 2012104199072A CN 201210419907 A CN201210419907 A CN 201210419907A CN 102937057 A CN102937057 A CN 102937057A
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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 discloses an engine EGR (exhaust gas recirculation) system for lowering the content of NOx in emissions of a diesel engine vehicle. The engine EGR system comprises a cooling water circulation mechanism and an exhaust gas recirculation mechanism, wherein the cooling water circulation mechanism is communicated with a whole vehicle radiator, and regulates the temperature of recirculation exhaust gas under the control of an ECU (electronic control unit) of the vehicle; and an EGR mechanism is configured between an engine exhaust manifold and an engine cylinder head exhaust gas inlet channel. The engine EGR system disclosed by the invention overcomes the defects of the existing EGR system, and can reduce the NOx content in tail gas of the vehicle greatly, meet the requirements of vehicle emission standards and improve the comprehensive performance of the engine.
Description
Technical field
The present invention relates to a kind of engine exhaust-gas recirculating system, especially a kind of gas recirculation system of vehicle-mounted diesel engine belongs to the combustion engine technical field.
Background technique
Carry the automobile of diesel engine, because engine air-fuel ratio is large, fuel burns under high-temperature oxygen-enriched condition, causes containing in the tail gas a large amount of NOx.And NOx is the material harmful to health, in automobile emissions standards its content has been carried out strict restriction, and therefore processing the NOx that transforms in the tail gas is one of main task of improving the diesel engine emissions performance.At present, NOx content generally is to realize by the conversion absorption dual mode of engines exhaust gas recirculation (EGR) and after-treatment device in the reduction emissions from engines.
Engines exhaust gas recirculation (EGR) device is because being easy to layout, and input cost is low, and is less to the change of other component of motor, is adopted by a lot of diesel-engined vehicles.Waste gas after the EGR device of diesel engine will burn is again introduced cylinder and is participated in burning, reduces the NOx content in the waste gas.In order to guarantee the performance of motor, after diesel engine is installed the EGR device, also need to arrange the facility that carries out cooling processing to introducing waste gas, the engines exhaust gas recirculation of Erecting and improving (EGR) system.But existing engines exhaust gas recirculation (EGR) system exists defective in the following areas: the one, and the shell cooler volume that adopts is large, is unfavorable for the layout of motor; The 2nd, cooling capacity changes with engine speed, causes sometimes egr system excess coolant, and excessively cold condensate exhaust gases thing increases, make EGR valve carbon distribution serious, even clamping stagnation, sometimes egr system cooling is not enough, overheated waste gas reduces the total air inflow of motor, affects engine performance; The 3rd, under motor short circle state, the circulating water of motor enters egr system, causes the cycle of engine coolant-temperature gage to reduce, and has prolonged the engine warm-up time; The 4th, there is not cooling water channel at the EGR valve seat, the EGR valve seat produces deformation under high heat energy impacts, and in order to reduce failure risk, most EGR valve seats adopt stainless steel, and cost is improved; The 5th, for avoiding the engine exhaust coagulant on the impact of EGR, EGR air outlet temperature waste gas and fresh air higher, that cause high-temperature mix, the total air inflow of motor is reduced, not only affect engine performance, and reduced the durability of plastic material intake manifold.
Summary of the invention
The object of the invention is to the drawback for prior art, provide a kind of and can satisfy the engine exhaust-gas recirculating system that emission standard requires, improves engine performance.
Problem of the present invention realizes with following technical proposals:
A kind of engine exhaust-gas recirculating system, it comprises cooling water circulation and exhaust gas recirculation mechanism, described cooling water circulation is communicated with the car load radiator, cooling water circulation is regulated the temperature of EGR gas under Engine ECU control, and described exhaust gas recirculation mechanism is arranged between enmgine exhaust and the engine cylinder cover gas inlet passage.
Above-mentioned engine exhaust-gas recirculating system, described cooling water circulation comprises cooler for recycled exhaust gas, electronic water pump and the cooling water circulation pipeline that is communicated with the car load radiator, described cooler for recycled exhaust gas is that plate sticks up the U-shaped cooler of formula, section is provided with cooling water passage and cycle gas passage within it, described cooling water passage and cooling water circulation pipeline connection, described cycle gas passage is communicated with exhaust gas recirculation mechanism.
Above-mentioned engine exhaust-gas recirculating system, described electronic water pump are connected in the cooling water circulation pipeline, can be by the flow control valve of Engine ECU control electronic water pump setting.
Above-mentioned engine exhaust-gas recirculating system, described exhaust gas recirculation mechanism comprises EGR assembly and EGR pipeline, described EGR assembly is comprised of EGR valve, EGR valve seat and EGR bypass valve, described EGR valve outlet port end is provided with the temperature transducer that is communicated with Engine ECU, and its entrance point is communicated with the EGR valve seat.
Above-mentioned engine exhaust-gas recirculating system, described EGR valve seat is provided with the suction port that is communicated with cooler for recycled exhaust gas cycle gas passage and EGR bypass valve respectively, on the EGR valve seat, also be provided with the air outlet that is communicated with the EGR valve, on the EGR valve seat, also be provided with the cooling water channel with the cooling water circulation pipeline connection.
Above-mentioned engine exhaust-gas recirculating system, described EGR bypass valve are arranged between enmgine exhaust and the EGR valve seat, and it and cooler for recycled exhaust gas are parallel-connection structure.
Above-mentioned engine exhaust-gas recirculating system, described engine cylinder cover gas inlet passage is connected with engine intake manifold, and it is arranged in the below of outfall sewer in the engine cylinder cover.
The present invention passes to Engine ECU by temperature transducer with exhaust gas temperature information, is regulated the cooling water flow of egr system by the flow control valve of Engine ECU control electronic water pump, makes the egr system cooling capacity not affected by engine speed; The present invention adopts plate to stick up the U-shaped cooler of formula, can promote cooling capacity under the prerequisite that does not change the cooler volume, satisfies the cooling requirement of high ER EGR Rate; Egr system of the present invention is quoted cooling water from the car load radiator, under motor short circle pattern, has shortened the engine warm-up time, under motor major cycle pattern, engine-cooling system is not produced considerable influence, has guaranteed the normal operation of motor; Adopt structure of the present invention to make EGR gas through the secondary cooling of cylinder cap exhaust steam passage cooling water channel, further reduced exhaust gas temperature, thereby increased the air inflow of motor, avoided simultaneously the impact of high-temp waste gas on the intake manifold durability; The present invention has designed cooling water channel at the EGR valve seat, has reduced the failure risk that the high temperature deformation of EGR valve seat causes, the EGR valve seat can adopt the cast aluminium material, has reduced manufacture cost.In a word, the invention solves the defective that existing engines exhaust gas recirculation (EGR) system exists, it can reduce the content of NOx in the Vehicular exhaust greatly, satisfies the combination property that vehicular emission standards requires, improves motor.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is main structure schematic diagram of the present invention;
Fig. 2 is working principle block diagram of the present invention;
Fig. 3 is EGR gas circulation schematic diagram;
Fig. 4 is cooling water circulation schematic diagram.
Each list of reference numerals is among the figure: 1, engine cylinder cover, 2, gas exhaust manifold, 3, cooler for recycled exhaust gas, 4, EGR bypass valve, 5, the EGR valve seat, 6, the EGR valve, 7, electronic water pump, 7-1, flow control valve, 8, Engine ECU, 9, temperature transducer, 10, intake manifold, 11, the car load radiator, 12, engine cylinder cover gas inlet passage, 13, cooling water circulation pipeline, 14, the EGR pipeline, 15, the Engine ECU signal transmission line.
Embodiment
Referring to Fig. 1, Fig. 2, the present invention includes cooling water circulation and exhaust gas recirculation mechanism, described cooling water circulation is communicated with car load radiator 11, cooling water circulation is regulated the temperature of EGR gas under Engine ECU 8 controls, and described exhaust gas recirculation mechanism is arranged between enmgine exhaust 2 and the engine cylinder cover gas inlet passage 12.The present invention adopts electronic water pump 7, the signal (or the amount of nitrogen oxides that detects by the discharging detection system) that sends to Engine ECU 8 by temperature transducer 9 is controlled the cooling water flow of electronic water pump 7, realization is to the control of the cooling capacity of egr system, when the EGR gas temperature is higher than the actual demand temperature, regulate electronic water pump 7, strengthen cooling water flow, strengthen its cooling capacity; When the EGR gas temperature is lower than the actual demand temperature, regulate electronic water pump 7, reduce cooling water flow, reduce its cooling capacity.By above measure, keep motor to be in optimum working state, improved the emission performance of motor.
Referring to Fig. 1, the present invention adopts plate to stick up the U-shaped cooler for recycled exhaust gas 3 of formula, cooling effectiveness can improve more than 90%, in the situation that do not change cooler for recycled exhaust gas 3 volumes, promote cooling capacity, reach with higher EGR and lead the purpose that adapts, that is: can make more waste gas reach the participation combustion temperature, satisfy the requirement of more maximum discharge standard.
Referring to Fig. 2, Fig. 4, under motor short circle pattern, the electronic water pump 7 of egr system draws water from car load radiator 11, and the cooler for recycled exhaust gas 3 of flowing through, EGR valve seat 5 return car load radiator 11, and the cooling water without the motor short circle has shortened warm-up period; Under motor major cycle pattern, still by above-mentioned cooling water circulation line EGR gas is cooled off, the cool cycles of engine cylinder-body and cylinder cap self do not exerted an influence.The present invention is provided with cooling water channel at EGR valve seat 5, when EGR valve seat 5 exhaust gas temperature of flowing through are higher, particularly under the egr system bypass mode, can cool off EGR valve seat 5, reduced EGR valve seat (5) because the failure risk that temperature distortion causes, EGR valve seat 5 can be selected casting aluminium material simultaneously, has saved cost.
Referring to Fig. 2, Fig. 3, the EGR gas temperature can produce carbon distribution and particulate matter and the phenomenon such as separate out when low, when these materials can be attached on the EGR valve 6, easily cause EGR valve 6 clamping stagnations, in the prior art for fear of this phenomenon, can only allow and still keep higher temperature through the waste gas after the cooler for recycled exhaust gas 3, the result is that the waste gas of high temperature mixes with fresh air like this, mixture temperature is higher, the total air inflow that enters cylinder is reduced, affected the performance of motor, the mixed gas of heat also is unfavorable for the reduction of oxynitrides content simultaneously.The present invention is provided with engine cylinder cover exhaust steam passage 12 below engine cylinder cover 1 interior outfall sewer, not only simplified the layout of EGR pipeline 14, and to further cooling off by the waste gas after the EGR valve 6, namely EGR gas has been carried out the secondary cooling, like this under the prerequisite of guaranteeing 6 normal operations of EGR valve, reduce exhaust gas temperature, reduce the impact on engine performance.Another advantage of this passage is that it is arranged in engine cylinder cover 1 water outlet below, does not change engine cylinder cover 1 inner water sleeve and arranges, can the cooling system of engine cylinder cover 1 not exerted an influence.
Claims (7)
1. engine exhaust-gas recirculating system, it is characterized in that, it comprises cooling water circulation and exhaust gas recirculation mechanism, described cooling water circulation is communicated with car load radiator (11), cooling water circulation is regulated the temperature of EGR gas under Engine ECU (8) control, and described exhaust gas recirculation mechanism is arranged between enmgine exhaust (2) and the engine cylinder cover gas inlet passage (12).
2. a kind of engine exhaust-gas recirculating system according to claim 1, it is characterized in that, described cooling water circulation comprises cooler for recycled exhaust gas (3), electronic water pump (7) and the cooling water circulation pipeline (13) that is communicated with car load radiator (11), described cooler for recycled exhaust gas (3) sticks up the U-shaped cooler of formula for plate, section is provided with cooling water passage and cycle gas passage within it, described cooling water passage is communicated with cooling water circulation pipeline (13), and described cycle gas passage is communicated with exhaust gas recirculation mechanism.
3. a kind of engine exhaust-gas recirculating system according to claim 2, it is characterized in that, described electronic water pump (7) is connected in the cooling water circulation pipeline (13), and the flow control valve (7-1) of being controlled by Engine ECU (8) is set at electronic water pump (7).
4. according to claim 1,2 or 3 described a kind of engine exhaust-gas recirculating systems, it is characterized in that, described exhaust gas recirculation mechanism comprises EGR assembly and EGR pipeline, described EGR assembly is comprised of EGR valve (6), EGR valve seat (5) and EGR bypass valve (4), described EGR valve (6) outlet end is provided with the temperature transducer (9) that is communicated with Engine ECU (8), and its entrance point is communicated with EGR valve seat (5).
5. a kind of engine exhaust-gas recirculating system according to claim 4, it is characterized in that, described EGR valve seat (5) is provided with the suction port that is communicated with cooler for recycled exhaust gas cycle gas passage and EGR bypass valve (4) respectively, on EGR valve seat (5), also be provided with the air outlet that is communicated with EGR valve (6), on EGR valve seat (5), also be provided with the cooling water channel that is communicated with cooling water circulation pipeline (13).
6. a kind of engine exhaust-gas recirculating system according to claim 5 is characterized in that, described EGR bypass valve (4) is arranged between enmgine exhaust (2) and the EGR valve seat (5), and it and cooler for recycled exhaust gas (3) are parallel-connection structure.
7. according to claim 1 or 6 described a kind of engine exhaust-gas recirculating systems, it is characterized in that, described engine cylinder cover gas inlet passage (12) is connected with engine intake manifold (10), and it is arranged in the below of outfall sewer in the engine cylinder cover.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210419907.2A CN102937057B (en) | 2012-10-29 | 2012-10-29 | A kind of engine exhaust-gas recirculating system |
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| CN201210419907.2A CN102937057B (en) | 2012-10-29 | 2012-10-29 | A kind of engine exhaust-gas recirculating system |
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| CN102937057A true CN102937057A (en) | 2013-02-20 |
| CN102937057B CN102937057B (en) | 2015-08-05 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105781812A (en) * | 2016-03-21 | 2016-07-20 | 潍柴动力股份有限公司 | EGR (exhaust gas recirculation) cooling closed-loop control system and method for cooling EGR gas |
| CN110792534A (en) * | 2019-11-28 | 2020-02-14 | 哈尔滨东安汽车动力股份有限公司 | Water outlet adapter of integrated EGR valve |
| CN111197539A (en) * | 2018-11-19 | 2020-05-26 | 现代自动车株式会社 | Control method for vehicle with exhaust gas recirculation system |
| CN113464324A (en) * | 2021-07-27 | 2021-10-01 | 无锡双翼汽车环保科技有限公司 | Multichannel EGR cooler |
| CN113464325A (en) * | 2021-08-06 | 2021-10-01 | 无锡同益汽车动力技术有限公司 | Novel EGR cooler |
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| CN201301763Y (en) * | 2008-08-13 | 2009-09-02 | 奇瑞汽车股份有限公司 | Exhaust gas recirculation cooler |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105781812A (en) * | 2016-03-21 | 2016-07-20 | 潍柴动力股份有限公司 | EGR (exhaust gas recirculation) cooling closed-loop control system and method for cooling EGR gas |
| CN111197539A (en) * | 2018-11-19 | 2020-05-26 | 现代自动车株式会社 | Control method for vehicle with exhaust gas recirculation system |
| CN110792534A (en) * | 2019-11-28 | 2020-02-14 | 哈尔滨东安汽车动力股份有限公司 | Water outlet adapter of integrated EGR valve |
| CN113464324A (en) * | 2021-07-27 | 2021-10-01 | 无锡双翼汽车环保科技有限公司 | Multichannel EGR cooler |
| CN113464325A (en) * | 2021-08-06 | 2021-10-01 | 无锡同益汽车动力技术有限公司 | Novel EGR cooler |
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| Publication number | Publication date |
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| CN102937057B (en) | 2015-08-05 |
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