CN102410091A - Device and method for protecting tail gas recycle valve from scaling - Google Patents
Device and method for protecting tail gas recycle valve from scaling Download PDFInfo
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- CN102410091A CN102410091A CN2010102934648A CN201010293464A CN102410091A CN 102410091 A CN102410091 A CN 102410091A CN 2010102934648 A CN2010102934648 A CN 2010102934648A CN 201010293464 A CN201010293464 A CN 201010293464A CN 102410091 A CN102410091 A CN 102410091A
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Abstract
The invention relates to a method for protecting an exhaust gas recycle (EGR) valve from scaling due to the condensation of hydrocarbon under low EGR cooler outlet tail gas temperature. In a modern internal combustion engine, the EGR valve provides a means for tail gas to be recycled to enter intake flow. The flow of tail gas entering gas flow is regulated by the EGR valve. The EGR valve can scale due to the condensation of hydrocarbon under low EGR cooler outlet tail gas temperature. Typically, scaling generates when the internal combustion engine works under relative low temperature, i.e. in low-speed and/or low-torque operation. The affection of the scaling of the EGR valve includes a high emission level, the decrease of saved fuel amount and unstability.
Description
Invention field
The present invention relates to be used to protect exhaust gas recirculation (EGR) valve not export the apparatus and method of condensation fouling under the exhaust temperature at low cooler for recycled exhaust gas because of hydrocarbon.
Background
In the internal-combustion engine, exhaust gas recirculation (EGR) valve provides the means of the exhaust gas recirculation in the control inlet stream in modern times.The EGR valve regulation gets into the flow of the tail gas of inlet stream.The EGR valve possibly experience fouling because of the condensation of hydrocarbon under low cooler for recycled exhaust gas outlet exhaust temperature.Fouling possibly occur in internal combustion engine when relative low temperature, just during low speed and/or the running of low moment of torsion.The effect of EGR valve fouling can comprise that higher emission level, saving of fuel amount reduce and/or unstability.
Summary of the invention
According to one or more aspects of the present invention; Can be through utilizing cooler for recycled exhaust gas outlet exhaust gas temperature sensor signal or based on the cooler for recycled exhaust gas Outlet Gas Temperature signal of model; Thereby reduce to predetermined threshold value or this threshold value cut-out EGR valve when following when the exhaust temperature of cooling, prevent the fouling of EGR valve.Predetermined threshold temperature can change for each internal-combustion engine, if utilize different materials and/or internal combustion engine component.Predetermined threshold value can be confirmed through carrying out various engine testings.In order to reach this purpose, the electronic control module of internal-combustion engine capable of using (ECM) is handled cooler for recycled exhaust gas outlet exhaust gas temperature sensor signal or under low cooler for recycled exhaust gas exhaust temperature, is closed based on the estimation cooler for recycled exhaust gas outlet exhaust temperature value of model and with post command EGR valve to one or more engine conditions calculating.
The accompanying drawing summary
Fig. 1-have internal-combustion engine of tail gas recirculation system.
Fig. 2-based on the exhaust gas cooler outlet temperature model of exhaust temperature.
Fig. 3-exhaust gas cooler outlet temperature signal.
Fig. 4-method is selected and the EGR valve cuts off enable logic.
Detailed Description Of The Invention
According to one or more aspects of the present invention; Can provide control strategy 200 with a certain mode effect through utilizing exhaust gas recirculation cooler outlet exhaust gas temperature sensor signal 401 or based on the cooler for recycled exhaust gas Outlet Gas Temperature signal of model 307 control exhaust gas recirculation (EGR) valves 105 and prevent 105 foulings of EGR valve, thereby control EGR valve.The fuel combustion product that in internal-combustion engine 100, adopts needs under the situation of special inhibition or burn off (burn-off), and additional control is desirable or necessary.For example, under transient state, the NO of generation is controlled in additional control capable of using
xAmount.
Internal-combustion engine 100 can comprise electronic controller 101, gas handling system 104, exhaust gas recirculation cooler 103, exhaust gas recirculating valve 105 and the sensor 102 that is positioned at exhaust gas recirculation cooler 103 downstream.Term " downstream " should be defined as after any one or more exhaust gas recirculation coolers 103 but position before any one or more EGR valves 105.
EGR valve 105 possibly experience fouling owing to hydrocarbon condensation under low cooler for recycled exhaust gas outlet exhaust temperature.The accurate temperature of hydrocarbon condensation possibly adopt different materials and/or internal combustion engine component difference because of each internal-combustion engine.Can confirm this accurate temperature through carrying out various engine testings.Fouling possibly occur in internal-combustion engine 100 and be operated in low relatively following time of exhaust temperature, i.e. operation under low temperature and/or low moment of torsion.
Control strategy 200 can activate through special-purpose entry criteria logic 204.This logic can not rely on anything, depends on one or more following internal combustion engine characteristic or its combination in any: internal-combustion engine rotational speed, exhaust temperature, engine coolant temperature, engine load or any other internal combustion engine characteristic.The internal combustion engine characteristic can be described as any other variable that utilizes in the operation of internal combustion engine that the technician knows in any measurable value, state, temperature, pressure, volume, quality or the field of internal combustion engine that record, that calculate or modeling.If entry criteria satisfies, then the control system signal through and EGR valve 105 partly or entirely close.If entry criteria is false, control system 200 is partly or entirely opened EGR valve 105.
According to one or more aspects of the present invention, control strategy 200 can a certain mode effect and through utilizing exhaust gas recirculation cooler outlet exhaust gas temperature sensor signal 401 to control exhaust gas recirculation (EGR) valve 105 and preventing 105 foulings of EGR valve.The exhaust temperature in exhaust gas cooler outlet temperature signal control strategy 400 monitoring coolers for recycled exhaust gas 103 downstream.This signal is carried through Signal Regulation logic 402 before getting into control strategy 200 then.
According to one or more aspects of the present invention, control strategy 200 can a certain mode effect and control exhaust gas recirculation (EGR) valve 105 and prevent 105 foulings of EGR valve based on the cooler for recycled exhaust gas Outlet Gas Temperature signal 307 of model through utilizing.Exhaust gas cooler outlet temperature model control strategy 300 can make up the exhaust temperature of predicting cooler for recycled exhaust gas 103 outlet ports based on following any one or its: exhaust temperature 303, engine coolant temperature 304, cooler for recycled exhaust gas efficient 302 or any other internal combustion engine characteristic.Can be through algorithm 306 these inputs of control based on model.The result of algorithm 306 then is sent to multiplier logic 202.Based on the algorithm 306 of model can be by rule of thumb or theoretical or its combination in any create.Can carry out the experiment of actual internal-combustion engine 100 or microcomputer modelling capable of usingly to gather based on model algorithm required information and data in any of control strategy 200 to creating.
Cooler for recycled exhaust gas efficient 302 can be dependent on EGR mass flow rate 301.For given EGR mass flow rate 301, final cooler for recycled exhaust gas efficient 302 as inlet flow to based on the algorithm 306 of model.
The output of exhaust gas cooler outlet temperature model 300 and exhaust gas cooler outlet temperature signal 400 is sent to method and selects logic 201.This logic allows the user to confirm what signal is through control strategy 200.If it is false that method is selected logic 201, then the cooler for recycled exhaust gas Outlet Gas Temperature signal 306 based on model will pass through as signal.If it is true that method is selected logic 201, then exhaust gas recirculation cooler outlet exhaust gas temperature sensor signal 403 will pass through as signal.
Select the output of logic 201 to get into EGR OFF multiplier logical block 202 from method.This logic comprise a temperature range and with EGR valve 105 cuts out or opening degree is corresponding value 0-1 or 0%-100%.The output of EGR OFF multiplier logical block 202 can be between 0-1 or 0-100%, and the EGR valve can part cut out or open in this case.
Output from EGR OFF multiplier logical block 202 gets into switch 203, and said switch 203 can activate through applying specific entry criteria logic 204.This logic can be depending on internal-combustion engine rotational speed, exhaust temperature, engine coolant temperature or engine load.If entry criteria satisfies, then multiplier values 202 is passed through and control EGR valve 105.If entry criteria is false, then multiplier values 202 will be opened EGR valve 105.
Claims (26)
1. internal-combustion engine comprises:
Housing;
Be arranged at least one cylinder in the said housing, fuel combustion take place in said cylinder to produce combustion tail gas;
Exhaust gas recirculation (EGR) cooler, at least a portion combustion tail gas does not perhaps have combustion tail gas through said exhaust gas recirculation cooler;
Gas handling system, atmosphere and at least a portion recirculation tail gas or do not have recirculation tail gas to mix and flow through said internal-combustion engine through said gas handling system and with the input atmosphere;
Be arranged on the exhaust gas recirculating valve in said cooler for recycled exhaust gas downstream, in order to change the amount of the recirculation tail gas that mixes with said atmosphere;
One or more sensors; Be used for one or more characteristics that sensing is associated with the internal-combustion engine running; The combustion tail gas temperature of the said exhaust gas recirculation cooler downstream of said character representation or any engine conditions, and send one or more signals of the said characteristic of expression; And
At least one electronic controller, said electronic controller is communicated by letter with said internal-combustion engine, in order to receive said one or more signal and in response to the said EGR valve of said SC sigmal control.
2. internal-combustion engine as claimed in claim 1 is characterized in that,
The one or more sensors that are used for sensing one or more characteristics of combustion tail gas temperature that be associated, that represent the exhaust gas recirculation cooler downstream with the internal-combustion engine running are temperature transducers.
3. internal-combustion engine as claimed in claim 1 is characterized in that,
Being used for sensing is used to the exhaust temperature of exhaust gas recirculation cooler downstream is carried out modeling or estimation with one or more sensors that internal-combustion engine operates one or more characteristics that be associated, expression combustion tail gas temperature.
4. internal-combustion engine as claimed in claim 1 is characterized in that,
In case said one or more sensor senses the temperature that is lower than predetermined temperature, said EGR valve moves to partly closes or complete closed position.
5. internal-combustion engine as claimed in claim 1 is characterized in that,
Said predetermined temperature can change to utilizing each internal-combustion engine of different materials and/or internal combustion engine component.
6. internal-combustion engine as claimed in claim 1 is characterized in that,
Predetermined threshold can be confirmed through the various engine testings of operation.
7. internal-combustion engine as claimed in claim 1 is characterized in that, the temperature of the said exhaust gas recirculation cooler downstream of said one or more sensor monitors.
8. internal-combustion engine as claimed in claim 1 is characterized in that, said one or more sensor monitors internal-combustion engine rotational speeds.
9. internal-combustion engine as claimed in claim 1 is characterized in that, said one or more sensor monitors exhaust temperatures.
10. internal-combustion engine as claimed in claim 1 is characterized in that, said one or more sensor monitors engine coolant temperature.
11. internal-combustion engine as claimed in claim 1 is characterized in that, said one or more sensor monitors engine load.
12. internal-combustion engine as claimed in claim 1 is characterized in that, said one or more sensor monitors amount of fuel injected.
13. internal-combustion engine as claimed in claim 1 is characterized in that, said one or more sensor monitors fuel of internal combustion engine temperature.
14. internal-combustion engine as claimed in claim 1 is characterized in that, any internal combustion engine characteristic of said one or more sensor monitors.
15. the control system with internal-combustion engine of exhaust gas recirculation cooler and exhaust gas recirculating valve comprises:
One or more sensors are used for sensing and are associated, represent one or more characteristics of the combustion tail gas heat energy of exhaust gas recirculation cooler downstream with the internal-combustion engine running, and send one or more signals of the said characteristic of expression; And
At least one electronic controller of communicating by letter with said internal-combustion engine is used to receive one or more signals and in response to said SC sigmal control EGR valve.
16. control system as claimed in claim 6 is characterized in that, the temperature of the said exhaust gas recirculation cooler downstream of said one or more sensor monitors.
17. control system as claimed in claim 6 is characterized in that, said one or more sensor monitors internal-combustion engine rotational speeds.
18. control system as claimed in claim 6 is characterized in that, said one or more sensor monitors exhaust temperatures.
19. control system as claimed in claim 6 is characterized in that, said one or more sensor monitors engine coolant temperature.
20. control system as claimed in claim 6 is characterized in that, said one or more sensor monitors engine load.
21. control system as claimed in claim 6 is characterized in that, said one or more sensor monitors amount of fuel injected.
22. control system as claimed in claim 6 is characterized in that, said one or more sensor monitors fuel of internal combustion engine temperature.
23. control system as claimed in claim 6 is characterized in that, any internal combustion engine characteristic of said one or more sensor monitors.
24. control system as claimed in claim 6 is characterized in that, said electronic controller comprise mathematics or based on the algorithm of model to calculate each internal combustion engine characteristic.
25. a control has the method for the internal-combustion engine of exhaust gas recirculation cooler and exhaust gas recirculating valve:
, any one or a plurality of special-purpose entry criteria activate control system when satisfying;
Utilize one or more sensors to measure the tail gas in exhaust gas cooler downstream;
Utilize one or more sensors to measure the exhaust gas recirculation mass flow rate;
Confirm said exhaust gas cooler efficient;
Temperature Modeling to the tail gas in exhaust gas cooler downstream;
Select the temperature that records through modeling temperature or said exhaust gas cooler downstream in said exhaust gas cooler downstream;
Based on the exhaust gas cooler downstream through modeling temperature, recording temperature or, confirming the position that requires of exhaust gas recirculating valve through any one or its combination of modeling internal combustion engine characteristic, exhaust gas cooler downstream through any measured value or its combination of modeling internal combustion engine characteristic; And
If any one or more special-purpose entry criteria satisfies, then drive said exhaust gas recirculating valve and make it partly to close or open or close fully or open.
26. control as claimed in claim 13 has the method for the internal-combustion engine of exhaust gas recirculation cooler and exhaust gas recirculating valve; It is characterized in that said one or more entry criteria can be any one or more internal combustion engine characteristics that comprise in internal-combustion engine rotational speed, exhaust temperature, engine coolant temperature, engine load, amount of fuel injected, the fuel of internal combustion engine temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102934648A CN102410091A (en) | 2010-09-20 | 2010-09-20 | Device and method for protecting tail gas recycle valve from scaling |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102934648A CN102410091A (en) | 2010-09-20 | 2010-09-20 | Device and method for protecting tail gas recycle valve from scaling |
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| CN102410091A true CN102410091A (en) | 2012-04-11 |
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| CN2010102934648A Pending CN102410091A (en) | 2010-09-20 | 2010-09-20 | Device and method for protecting tail gas recycle valve from scaling |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108005804A (en) * | 2016-10-27 | 2018-05-08 | 福特环球技术公司 | A kind of method for cleaning exhaust-gas-recirculation valve |
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| US20010017033A1 (en) * | 1999-08-20 | 2001-08-30 | Mckinley Thomas L. | Exhaust gas recirculation system for a turbocharged internal combustion engine |
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| US20090101122A1 (en) * | 2007-10-18 | 2009-04-23 | Ford Global Technologies, Llc | Multi-Cooler EGR Cooling |
| CN101622437A (en) * | 2007-03-06 | 2010-01-06 | 通用汽车环球科技运作公司 | Method and apparatus for estimating exhaust temperature of an 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 |
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2010
- 2010-09-20 CN CN2010102934648A patent/CN102410091A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010017033A1 (en) * | 1999-08-20 | 2001-08-30 | Mckinley Thomas L. | Exhaust gas recirculation system for a turbocharged internal combustion engine |
| JP2005076502A (en) * | 2003-08-29 | 2005-03-24 | Toyota Motor Corp | Internal combustion engine |
| CN1490513A (en) * | 2003-09-24 | 2004-04-21 | 蒋建东 | Recirculating purifying system of diesel engine exhaust |
| CN101289965A (en) * | 2006-12-27 | 2008-10-22 | 通用汽车环球科技运作公司 | Waste gas recirculation estimation system |
| CN101622437A (en) * | 2007-03-06 | 2010-01-06 | 通用汽车环球科技运作公司 | Method and apparatus for estimating exhaust temperature of an internal combustion engine |
| US20090101122A1 (en) * | 2007-10-18 | 2009-04-23 | Ford Global Technologies, Llc | Multi-Cooler EGR Cooling |
| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108005804A (en) * | 2016-10-27 | 2018-05-08 | 福特环球技术公司 | A kind of method for cleaning exhaust-gas-recirculation valve |
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Application publication date: 20120411 |