CN103485937A - Engine EGR (Exhaust Gas Recirculation) system - Google Patents
Engine EGR (Exhaust Gas Recirculation) system Download PDFInfo
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- CN103485937A CN103485937A CN201310394755.XA CN201310394755A CN103485937A CN 103485937 A CN103485937 A CN 103485937A CN 201310394755 A CN201310394755 A CN 201310394755A CN 103485937 A CN103485937 A CN 103485937A
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- exhaust gas
- egr
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- cooler
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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 engine EGR (Exhaust Gas Recirculation) system, comprising an EGR cooler, an EGR valve, a by-pass line and a temperature sensor, wherein the EGR valve is communicated with the gas outlet end of the EGR cooler; the by-pass line is connected with the EGR cooler in parallel; an exhaust gas flow control proportional valve which is connected with an ECU (Engine Control Unit) in a controlling way is mounted at the inlet of the by-pass line; the temperature sensor is arranged between the outlet of the by-pass line and the EGR valve and is taken as an input end used for collecting the valve inlet exhaust gas temperature of the EGR valve by the ECU. The engine EGR system is simple in structure; the by-pass line which is connected with the EGR cooler in parallel and is provided with the proportional valve is adopted; the temperature of the valve inlet exhaust gas entering the EGR valve is adjusted by adjusting the opening proportion of the proportional valve; the EGR valve inlet exhaust gas temperature is controllable under all operating working conditions of an engine; the EGR system is free of carbon deposition and gum deposit; therefore the temperature of the mixed gas entering an engine cylinder can be well controlled; the optimal states of engine performance and discharge are realized; the cooling efficiency of the EGR cooler is monitored in real time, so that the reliability of a product is ensured.
Description
Technical field
The present invention relates to engine art, particularly a kind of engine EGR system.
Background technique
Reduce NO as motor
xone of Main Means of discharge, EGR(EGR) technology is found broad application on light-duty vehicular engine.Along with the progress of automotive industry, the EGR technology has obtained significant progress, from the pneumatic EGR valve of vacuum control formula, and the electric EGR valve driven to direct current generator; From non-cooling EGR system to the cooling EGR system with cooler for recycled exhaust gas, all greatly promoted the successful utilization of EGR technology on motor.
Yet, along with the increasingly stringent of Abgasgesetz, motor also increases gradually to the demand (being that EGR leads) of EGR waste gas, stability and the endurance issues of egr system become increasingly conspicuous.In the motor of assembling egr system, the problems such as carbon distribution how to avoid egr system (especially EGR valve) to cause because of long-term use, gum deposit, become a difficult problem urgently to be resolved hurrily.Too low through the cooled exhaust gas temperature of cooler for recycled exhaust gas, carbon distribution deposition in waste gas, after not firing the corrosive material condensation such as HC, be combined with carbon distribution and produce jelly, and this is the one of the main reasons of egr system carbon distribution, gum deposit.
Avoid the existing method of egr system carbon distribution, gum deposit to comprise: at first, by the Proper Match cooler for recycled exhaust gas, optimize the cooler cooling effectiveness, exhaust gas temperature that as much as possible will be cooling via cooler for recycled exhaust gas is controlled at zone of reasonableness (120-180 ℃) (this temperature range EGR valve carbon distribution, gum deposit few).Secondly, by the by-pass collar of cooler for recycled exhaust gas associated simple switch valve, at the part operating conditions of motor, can directly exhaust gas bypass, without cooler for recycled exhaust gas, be avoided to the waste gas supercooling, avoid egr system carbon distribution, gum deposit.
Existing technological scheme major defect:
At first, the actual operating mode complexity of motor, exhaust gas temperature and exhaust gas flow via egr system change greatly, by the Proper Match cooler for recycled exhaust gas, optimize the cooler cooling effectiveness, the exhaust gas temperature that can guarantee cooler for recycled exhaust gas outlet (that is before EGR valve) in certain condition range is controlled at zone of reasonableness, but is difficult to take into account the demand of the best exhaust gas temperature of whole discharge operating mode district egr system.
Secondly, adopt the cooler for recycled exhaust gas with by-pass collar, can expand to a certain extent the control range of cooler for recycled exhaust gas, but, only by a simple switch valve, regulatable being limited in scope of exhaust gas temperature of cooler for recycled exhaust gas outlet, can't realize accurately controlling to it.
Finally, the exhaust gas temperature of cooler for recycled exhaust gas outlet is very large on performance and the discharge impact of motor, and as key components and parts in egr system, cooler for recycled exhaust gas is most important to the cooling action of waste gas.Test shows, the cooling effectiveness of cooler for recycled exhaust gas is along with can decrease service time, and existing system can't be judged its cooling effectiveness, and this can cause risk that the motor discharge is transfinited to increase.
Summary of the invention
The present invention is in order to overcome defect in above-mentioned prior art, provides a kind of simple and reasonable, can realize under all operating conditionss of motor, and before the EGR valve, exhaust gas temperature is controlled, effectively avoids egr system carbon distribution, gum deposit; And then control well the mixture temperature entered in engine cylinder, thereby can realize the optimum state of engine performance and discharge; And monitor in real time by the cooling effectiveness to cooler for recycled exhaust gas, guarantee the engine EGR system of product reliability.
For achieving the above object, according to the invention provides a kind of engine EGR system, comprising:
Cooler for recycled exhaust gas;
The EGR valve, be communicated with the cooler for recycled exhaust gas outlet side;
Bypass line, in parallel with cooler for recycled exhaust gas, its ingress is equipped with the exhaust gas flow control ratio valve of controlling in real time by Engine ECU;
Temperature transducer, be laid in bypass line and be exported between the EGR valve, as the input end of exhaust gas temperature before Engine ECU collection EGR valve.
In technique scheme, cooler for recycled exhaust gas has cooler for recycled exhaust gas feed-water end and cooler for recycled exhaust gas waterexit end.
In technique scheme, cooler for recycled exhaust gas and its bypass line are by waste gas inlet tube and engine exhaust pipe conducting.
In technique scheme, the EGR valve is electric EGR valve.
In technique scheme, enter final the importing by the engine charge of the supercharger air compressor of fresh air intake pressurization of exhaust of EGR valve, then enter engine air inlet tube through the mixed gas air inlet pipeline exhaust is burnt once again.
Compared with prior art, the present invention has following beneficial effect: this engine EGR system architecture advantages of simple, adopt bypass line with Proportional valve in parallel with cooler for recycled exhaust gas, unlatching ratio by the resize ratio valve, realize the exhaust gas bypass of different flow, with adjustment, enter the exhaust gas temperature before EGR valve valve, can realize under all operating conditionss of motor, before the EGR valve, exhaust gas temperature is controlled, effectively avoids egr system carbon distribution, gum deposit; And then control well the mixture temperature entered in engine cylinder, thereby can realize the optimum state of engine performance and discharge; And monitor in real time by the cooling effectiveness to cooler for recycled exhaust gas, guaranteed product reliability.
The accompanying drawing explanation
The structural representation that Fig. 1 is engine EGR system of the present invention;
The flow chart that Fig. 2 is engine EGR system of the present invention;
Description of reference numerals:
The 1-engine exhaust pipe, 2-bypass proportional control valve, 3-waste gas inlet tube, the 4-EGR cooler, 5-charger turbine, 6-EGR cooler feed-water end, 7-EGR cooler waterexit end, the 8-supercharger air compressor, 9-fresh air intake, 10-temperature transducer, the 11-EGR valve, 12-mixed gas air inlet pipeline, 13-engine air inlet tube, 14-motor.
Embodiment
Below in conjunction with accompanying drawing, a specific embodiment of the present invention is described in detail, but is to be understood that protection scope of the present invention is not subject to the restriction of embodiment.It will be appreciated that, mentioned in following mode of execution of the present invention " on ", D score, " left side ", " right side ", " front " and " reverse side " all take the direction shown in each figure as benchmark, these words that are used for limiting direction are only for convenience of explanation, do not represent the restriction to the concrete technological scheme of the present invention.
Engine EGR system architecture advantages of simple of the present invention, adopt bypass line with Proportional valve in parallel with cooler for recycled exhaust gas, unlatching ratio by the resize ratio valve, realize the exhaust gas bypass of different flow, enter the exhaust gas temperature before EGR valve valve with adjustment, can realize under all operating conditionss of motor, before the EGR valve, exhaust gas temperature is controlled, effectively avoids egr system carbon distribution, gum deposit; And then control well the mixture temperature entered in engine cylinder, thereby can realize the optimum state of engine performance and discharge; And monitor in real time by the cooling effectiveness to cooler for recycled exhaust gas, guaranteed product reliability.
Below detailed description by way of example but unrestriced mode has illustrated the disclosure, should be understood that various aspect of the present disclosure can be by independent realization or the realization of being combined with other aspects.This specification clearly enables those skilled in the art to manufacture and uses us to believe for new and non-obvious improvement, describe some embodiments, alternative, modification, alternative and system applies, comprised the current best mode that is considered to carry out the inventive principle of describing in this specification.When describing element or feature and/or embodiment, be intended to expression titled with " one " " one " " be somebody's turn to do " and " described " and there are one or more in element or feature.Term " comprises " that " comprising " and " having " is intended to is comprising property, and also has extra element or feature beyond being illustrated in those specifically described elements or feature.
As shown in Figure 1, this engine EGR system is that exhaust gas recirculatioon (Exhaust Gas Recirculation) isolates and import by the part of Exhaust Gas the technology that the air inlet side is burnt it once again for compact internal combustion engine after burning.Main purpose is for reducing the nitrogen oxide (NO in Exhaust Gas
x).The concrete structure of engine EGR system comprises: cooler for recycled exhaust gas 4 and the EGR valve 11 be communicated with cooler for recycled exhaust gas 4 outlet sides, and the bypass line in parallel with cooler for recycled exhaust gas 4 and be laid in bypass line and be exported to the temperature transducer 10 between EGR valve 11.Wherein, bypass line is connected in parallel on the cooler for recycled exhaust gas two ends, at the bypass line entrance, a Proportional valve 2 is installed, for controlling the flow of bypass waste gas, temperature transducer 10 is for measuring exhaust gas temperature before the EGR valve, and the measured value of ECU collecting temperature sensor, with default object module temperature value, comparing, (the object module temperature is in the engine development process, the Optimal Temperature value of exhaust gas temperature before the EGR valve valve of demarcating according to demand), according to deviation, drive Proportional valve to carry out closed-loop adjustment, unlatching ratio by the resize ratio valve, realize the exhaust gas bypass of different flow, enter the exhaust gas temperature before EGR valve valve with adjustment, can realize under all operating conditionss of motor, before the EGR valve, exhaust gas temperature is controlled, effectively avoid the egr system carbon distribution, gum deposit, and then control well the mixture temperature entered in engine cylinder, thereby can realize the optimum state of engine performance and discharge, and monitor in real time by the cooling effectiveness to cooler for recycled exhaust gas, guaranteed product reliability.
When motor 14, during in operating condition, the part of engine exhaust pipe 1 Exhaust Gas enters charger turbine 5 and discharges; Another part gas is isolated and is imported the cooler for recycled exhaust gas 4 with bypass line in parallel through waste gas inlet tube 3, and the bypass line entrance is equipped with Proportional valve 2, and cooler for recycled exhaust gas 4 has cooler for recycled exhaust gas feed-water end 6 and cooler for recycled exhaust gas waterexit end 7; Enter again afterwards the final engine charge pressurizeed by the supercharger air compressor 8 of fresh air intake 9 that imports of EGR valve 11, enter engine air inlet tube 13 through mixed gas air inlet pipeline 12 exhaust is burnt once again, temperature transducer 10 is laid in bypass line and is exported between EGR valve 11.
During in operating condition, at first judge that whether the EGR valve is in running order when motor, if in running order, the proportional valve control function enables (in the work armed state), otherwise closes.In running order when the EGR valve, the proportional valve control function enables, and ECU can gather the exhaust gas temperature T before EGR valve valve, and with the object module temperature value T be stored in ECU
dcontrast.Draw temperature gap △ T=(T-T by contrast
d).
As shown in Figure 2, when △ T<0 ℃, when before EGR valve valve, true temperature is lower than target temperature, can cause the risk of egr system carbon distribution and gum deposit, now cooler for recycled exhaust gas is to the waste gas supercooling.ECU regulates Proportional valve according to △ T actual value and opens certain aperture, by part waste gas without cooling directly arrive the EGR valve before.Along with the unlatching of Proportional valve, △ T increases gradually, and when equaling 0, when true temperature is equal to target temperature, Proportional valve stops regulating and maintains current opening value, until △ T changes.
When △ T>0 ℃, when true temperature is higher than target temperature before EGR valve valve, via the exhaust gas temperature of EGR valve, relatively raise, the actual mixture temperature entered in engine cylinder is higher, causes performance and the deterioration of emission of motor.Before EGR valve valve, during excess Temperature, also can cause the EGR valve to be damaged because operating temperature is too high.Now cooler for recycled exhaust gas is to the cooling deficiency of waste gas.ECU regulates Proportional valve according to △ T actual value and closes certain aperture, before impelling most of waste gas to reach the EGR valve after cooler for recycled exhaust gas is cooling again.Along with closing of Proportional valve, △ T reduces gradually, and when equaling 0, when true temperature is equal to target temperature, Proportional valve stops regulating and maintains current opening value, until △ T changes.
As △ T=0 ℃, when before EGR valve valve, true temperature is equal to target temperature, Proportional valve maintains current opening value, until △ T changes.
When △ T>0 ℃, when Proportional valve closes to 0 position gradually, if cooler for recycled exhaust gas work normal can be thought in △ T>50 ℃ now, but cooling effectiveness descends to some extent; If △ were T>100 ℃; judge the cooler for recycled exhaust gas operation irregularity; cooling effectiveness does not meet usage requirement; ECU generates diagnostic trouble code according to result of determination; light the complete vehicle fault lamp, and take the torque protection measure, the operating conditions of limiting engine; prevent from damaging other parts of egr system, and the motor discharge is obviously deteriorated.
Native system is adapted to existing EGR motor, does not need in appearance to carry out larger change.
To sum up, this engine EGR system architecture advantages of simple, employing is the bypass line with Proportional valve in the cooler for recycled exhaust gas parallel connection, unlatching ratio by the resize ratio valve, realize the exhaust gas bypass of different flow, with adjustment, enter the exhaust gas temperature before EGR valve valve, can realize under all operating conditionss of motor, before the EGR valve, exhaust gas temperature is controlled, effectively avoids egr system carbon distribution, gum deposit; And then control well the mixture temperature entered in engine cylinder, thereby can realize the optimum state of engine performance and discharge; And monitor in real time by the cooling effectiveness to cooler for recycled exhaust gas, guaranteed product reliability.
Above disclosed be only several specific embodiment of the present invention, still, the present invention is not limited thereto, the changes that any person skilled in the art can think of all should fall into protection scope of the present invention.
Claims (5)
1. an engine EGR system, is characterized in that, comprising:
Cooler for recycled exhaust gas;
The EGR valve, be communicated with the cooler for recycled exhaust gas outlet side;
Bypass line, in parallel with cooler for recycled exhaust gas, its ingress is equipped with the exhaust gas flow control ratio valve of controlling in real time by Engine ECU;
Temperature transducer, be laid in bypass line and be exported between the EGR valve, as the input end of exhaust gas temperature before Engine ECU collection EGR valve.
2. engine EGR system according to claim 1, it is characterized in that: described cooler for recycled exhaust gas has cooler for recycled exhaust gas feed-water end and cooler for recycled exhaust gas waterexit end.
3. engine EGR system according to claim 1 is characterized in that: described cooler for recycled exhaust gas and its bypass line are by waste gas inlet tube and engine exhaust pipe conducting.
4. engine EGR system according to claim 1, it is characterized in that: described EGR valve is electric EGR valve.
5. according to the described engine EGR system of any one in claim 1 to 4, it is characterized in that: the exhaust of the described EGR of entering valve is final to be imported by the engine charge of the supercharger air compressor of fresh air intake pressurization, then enters engine air inlet tube through the mixed gas air inlet pipeline exhaust is burnt once again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310394755.XA CN103485937A (en) | 2013-08-30 | 2013-08-30 | Engine EGR (Exhaust Gas Recirculation) system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310394755.XA CN103485937A (en) | 2013-08-30 | 2013-08-30 | Engine EGR (Exhaust Gas Recirculation) system |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104847536A (en) * | 2014-02-27 | 2015-08-19 | 北汽福田汽车股份有限公司 | EGR cooler |
| CN105545534A (en) * | 2014-10-22 | 2016-05-04 | 福特环球技术公司 | Exhaust system and methods for efficient exhaust heat recovery |
| CN109339962A (en) * | 2018-09-28 | 2019-02-15 | 潍柴动力股份有限公司 | A kind of control method and device of EGR valve |
| CN109915287A (en) * | 2019-03-27 | 2019-06-21 | 潍柴动力股份有限公司 | EGR gas temperature control method and relevant apparatus |
| CN109973260A (en) * | 2017-12-27 | 2019-07-05 | 丰田自动车株式会社 | The exhaust gas recirculation system of internal combustion engine |
| CN110953096A (en) * | 2018-09-26 | 2020-04-03 | 广州汽车集团股份有限公司 | Gasoline engine and combustion control method thereof |
| 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 |
| CN112523877A (en) * | 2020-10-21 | 2021-03-19 | 广西玉柴机器股份有限公司 | Control method for high-pressure exhaust gas recirculation cooling bypass valve |
| CN115013174A (en) * | 2022-07-06 | 2022-09-06 | 潍柴动力股份有限公司 | Control method of EGR system, EGR system and vehicle |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104847536A (en) * | 2014-02-27 | 2015-08-19 | 北汽福田汽车股份有限公司 | EGR cooler |
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| CN110953096A (en) * | 2018-09-26 | 2020-04-03 | 广州汽车集团股份有限公司 | Gasoline engine and combustion control method thereof |
| CN109339962A (en) * | 2018-09-28 | 2019-02-15 | 潍柴动力股份有限公司 | A kind of control method and device of 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 |
| CN109915287A (en) * | 2019-03-27 | 2019-06-21 | 潍柴动力股份有限公司 | EGR gas temperature control method and relevant apparatus |
| CN112523877A (en) * | 2020-10-21 | 2021-03-19 | 广西玉柴机器股份有限公司 | Control method for high-pressure exhaust gas recirculation cooling bypass valve |
| CN112523877B (en) * | 2020-10-21 | 2022-08-30 | 广西玉柴机器股份有限公司 | Control method for high-pressure exhaust gas recirculation cooling bypass valve |
| CN115013174A (en) * | 2022-07-06 | 2022-09-06 | 潍柴动力股份有限公司 | Control method of EGR system, EGR system and vehicle |
| CN115013174B (en) * | 2022-07-06 | 2023-08-18 | 潍柴动力股份有限公司 | Control method of EGR (exhaust gas Recirculation) system, EGR system and vehicle |
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Application publication date: 20140101 |