CN114810391A - Control strategy for implementing oxygen storage compensation of degradation catalyst - Google Patents
Control strategy for implementing oxygen storage compensation of degradation catalyst Download PDFInfo
- Publication number
- CN114810391A CN114810391A CN202210497562.6A CN202210497562A CN114810391A CN 114810391 A CN114810391 A CN 114810391A CN 202210497562 A CN202210497562 A CN 202210497562A CN 114810391 A CN114810391 A CN 114810391A
- Authority
- CN
- China
- Prior art keywords
- oxygen storage
- catalyst
- control unit
- strategy
- state
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1454—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0027—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures the fuel being gaseous
Abstract
The invention discloses a control strategy for realizing oxygen storage amount compensation of a degradation catalyst, which comprises a control unit and the following steps: s1: monitoring the oxygen storage amount level of a catalyst when the current natural gas engine runs through a control unit; s2: when the oxygen storage monitoring frequency N is smaller than a calibration threshold value, continuing to execute an oxygen storage monitoring strategy, and when the oxygen storage monitoring frequency is larger than or equal to the calibration threshold value, executing an oxygen storage correction strategy; s3: the control unit controls the content of air entering by referring to the deviation of the oxygen storage amount correction pulse spectrum, so that the air-fuel ratio of the catalyst is controlled at the optimal conversion window in the catalyst, and the corresponding target value is achieved. The invention monitors the oxygen storage level of the current catalytic converter in real time through the control unit, corrects pulse spectrum by contrasting the oxygen storage level and calibrates the emission of the catalytic converter, so that the air-fuel ratio control at the inlet of the catalytic converter is in the optimal conversion window, high-precision air-fuel ratio control at the inlet of the catalytic converter is realized, and the emission of an engine and a whole vehicle is ensured to meet the emission regulation and control requirements.
Description
[ technical field ] A method for producing a semiconductor device
The invention belongs to the field of control of oxygen storage amount of an engine, and particularly relates to a control strategy for realizing compensation of oxygen storage amount of a degradation catalyst.
[ background of the invention ]
At present, a natural gas engine is a catalyst model which is calibrated and confirmed based on emission of a catalyst in a certain state, an existing oxygen storage monitoring mode can only carry out monitoring compensation aiming at the certain state of the catalyst, a real-time dynamic compensation strategy is not available, the catalyst can be gradually degraded under the action of high-temperature environment and air flow erosion, the oxygen storage amount of the catalyst is correspondingly degraded after degradation, the air-fuel ratio control at an inlet of the catalyst can deviate from an optimal conversion window, when the air-fuel ratio control deviates from the optimal conversion window, the conversion efficiency of each pollutant in tail gas is reduced, and the emission can be degraded even exceeds the national regulation requirement in the state.
[ summary of the invention ]
The invention aims to provide a control strategy for realizing oxygen storage compensation of a degraded catalyst, and aims to solve the problems that no real-time dynamic compensation strategy exists in the existing catalyst model, the air-fuel ratio control at the inlet of the catalyst deviates from an optimal conversion window when the oxygen storage of the catalyst is reduced, the conversion efficiency of pollutants in tail gas is reduced, and the discharged gas does not accord with national regulations.
In order to solve the technical problems, the invention adopts the following technical scheme:
the control strategy for realizing the oxygen storage amount compensation of the degradation catalyst comprises a control unit and comprises the following steps:
s1: monitoring the oxygen storage amount level of a catalyst when the current natural gas engine runs through a control unit;
s2: when the oxygen storage monitoring frequency N is smaller than a calibration threshold value, continuing to execute an oxygen storage monitoring strategy, and when the oxygen storage monitoring frequency is larger than or equal to the calibration threshold value, executing an oxygen storage correction strategy;
s3: the control unit controls the content of air entering by referring to the deviation of the oxygen storage amount correction pulse spectrum, so that the air-fuel ratio of the catalyst is controlled at the optimal conversion window in the catalyst, and the corresponding target value is achieved.
Further, the control unit is an ECU.
Further, the catalyst is a fresh-state catalyst container oxygen storage model and a degraded-state catalyst oxygen storage model.
Further, the monitoring strategy comprises monitoring oxygen storage amount of a fresh state catalytic container oxygen storage model and a degraded state catalytic converter oxygen storage model, and comprises the following steps:
firstly, calibrating the difference of oxygen storage amounts of an oxygen storage model of a fresh state catalytic container and an oxygen storage model of a degraded state catalytic reactor by a control unit, and calculating the difference of the oxygen storage amounts of the fresh state catalytic container and the degraded state catalytic reactor;
in the algorithm operation of the control unit, when the oxygen storage amounts of the fresh-state catalytic container oxygen storage model and the degraded-state catalytic converter oxygen storage model reach the calibration values, the control unit carries out compensation correction on the oxygen storage amounts of the fresh-state catalytic container oxygen storage model and the degraded-state catalytic converter oxygen storage model.
Further, the correction strategy is that when the air-fuel ratio concentration of the oxygen storage model of the degradation state catalyst is increased, the control unit reduces the supplement of the fuel, thereby adjusting the mixing ratio of the air and the fuel.
The invention has the following beneficial effects:
when the natural gas engine runs, monitoring the oxygen storage amount level of the current catalyst in real time through the control unit, comparing the oxygen storage amount correction pulse spectrum and calibrating the emission of the catalyst, and when the oxygen storage amount of the catalyst is continuously in a certain stage, identifying whether the catalyst is degraded or not through parameter comparison in the oxygen storage amount correction pulse spectrum by the control unit; when the oxygen storage amount monitoring times are smaller than the calibration threshold value, the oxygen storage amount monitoring strategy is continuously executed, and abnormal correction caused by accidental abnormal oxygen storage monitoring is avoided; when the oxygen storage monitoring frequency N is larger than or equal to the calibration threshold, an oxygen storage correction strategy is executed, the air-fuel ratio control precision of the inlet of the catalytic converter is further improved, the catalytic converter is ensured to be in a high conversion efficiency state, the air-fuel ratio control of the inlet of the catalytic converter is enabled to be in an optimal conversion window, the high-precision air-fuel ratio control of the inlet of the catalytic converter is realized, and the emission of an engine and the whole vehicle is ensured to meet the requirements of the national emission regulation and regulations.
[ description of the drawings ]
In the drawings:
FIG. 1 is a schematic view of a catalyst oxygen storage compensation strategy according to the present invention;
fig. 2 is a basic schematic diagram of the operation of the engine of the present invention.
Reference numerals: 1. an engine body; 2. an air intake side; 3. an exhaust side; 4. EGR; 5. a throttle valve; 6. an intercooler; 7. a supercharger; 8. a catalyst.
[ detailed description ] embodiments
The following is a detailed description of specific embodiments.
The present invention will be described in further detail with reference to specific embodiments. It should be emphasized that the following description is merely exemplary in nature and is not intended to limit the scope of the invention or its application.
As shown in fig. 1-2, the control strategy for realizing the oxygen storage amount compensation of the degradation catalyst comprises an engine body 1, wherein the engine body 1 is provided with an air inlet side 2 and an air outlet side 3, the air inlet side 3 of the engine body 1 is provided with a throttle valve 5, and the other end of the throttle valve 5 is provided with an intercooler 6; EGR4 is arranged between the air inlet side 2 and the air outlet side 3 of the engine body 1, one end of the air outlet side 3 connected with the EGR4 is connected with one end of a supercharger 7, the air outlet end of the supercharger 7 is connected with a catalyst 8, and the catalyst 8 is a three-way catalyst; the method comprises an ECU control unit, and a control strategy for compensating oxygen storage amount of the degradation catalyst is realized through the ECU control unit, wherein the control strategy comprises the following steps:
monitoring the oxygen storage amount level of a catalyst 8 when the natural gas engine runs at present through an ECU (electronic control Unit); the catalyst 8 may have different operating conditions at different time nodes, such as when a newly used catalyst 8 is used to have a fresh catalyst container oxygen storage model, and after continued high temperature or gas flow erosion, has a degraded catalyst oxygen storage model.
In the monitoring process, when the oxygen storage monitoring times N of the catalyst 8 are smaller than a calibration threshold value, continuously executing an oxygen storage monitoring strategy, wherein the monitoring strategy comprises monitoring the oxygen storage of an oxygen storage model of a fresh-state catalytic container and the oxygen storage of an oxygen storage model of a degraded-state catalyst, and the steps comprise firstly calibrating the difference of the oxygen storage model of the fresh-state catalytic container and the oxygen storage of the degraded-state catalyst by an ECU (electronic control Unit) control unit and calculating the difference value of the oxygen storage of the fresh-state catalytic container and the oxygen storage of the degraded-state catalyst; in the operation of the algorithm of the control unit, when the oxygen storage amounts of the oxygen storage model of the fresh-state catalytic container and the oxygen storage model of the degraded-state catalytic converter reach the calibration values, the ECU control unit compensates and corrects the oxygen storage amounts of the fresh-state catalytic container and the degraded-state catalytic converter; when the oxygen storage monitoring times are larger than or equal to the calibration threshold value, executing an oxygen storage correction strategy; the correction strategy is that when the air-fuel ratio concentration of the oxygen storage model of the degradation state catalyst is increased, the ECU control unit reduces the supplement of the fuel, thereby adjusting the mixing ratio of the air and the fuel. According to the deviation of the oxygen storage amount compared with the pulse spectrum corrected by referring to the oxygen storage amount, the ECU control unit controls the air inlet content, so that the air-fuel ratio of the catalytic converter 8 is controlled at the optimal conversion window in the catalytic converter, the corresponding target value is reached, the catalytic converter is ensured to be in a state of high conversion efficiency, the real-time high-precision air-fuel ratio control of the catalytic converter 8 inlet is realized, and the emission of an engine and a whole vehicle is ensured to meet the national six emission regulations.
Claims (5)
1. Control strategy for realizing oxygen storage amount compensation of degradation catalyst comprises a control unit and is characterized in that: the method comprises the following steps:
s1: monitoring the oxygen storage amount level of a catalyst when the current natural gas engine runs through a control unit;
s2: when the oxygen storage monitoring frequency N is smaller than a calibration threshold value, continuing to execute an oxygen storage monitoring strategy, and when the oxygen storage monitoring frequency is larger than or equal to the calibration threshold value, executing an oxygen storage correction strategy;
s3: the control unit controls the content of air entering by referring to the deviation of the oxygen storage amount correction pulse spectrum, so that the air-fuel ratio of the catalyst is controlled at the optimal conversion window in the catalyst, and the corresponding target value is achieved.
2. The control strategy for achieving oxygen storage amount compensation for a degradation catalyst of claim 1, wherein: the control unit is an ECU.
3. The control strategy for achieving oxygen storage amount compensation for a degradation catalyst of claim 1, wherein: the catalyst is a fresh-state catalyst container oxygen storage model and a degraded-state catalyst oxygen storage model.
4. The control strategy for achieving oxygen storage amount compensation for a degradation catalyst of claim 1, wherein: the monitoring strategy comprises oxygen storage amount monitoring of a fresh state catalytic container oxygen storage model and a degraded state catalytic reactor oxygen storage model, and comprises the following steps:
firstly, calibrating the difference of oxygen storage amounts of an oxygen storage model of a fresh state catalytic container and an oxygen storage model of a degraded state catalytic reactor by a control unit, and calculating the difference of the oxygen storage amounts of the fresh state catalytic container and the degraded state catalytic reactor;
in the algorithm operation of the control unit, when the oxygen storage amounts of the fresh-state catalytic container oxygen storage model and the degraded-state catalytic converter oxygen storage model reach the calibration values, the control unit carries out compensation correction on the oxygen storage amounts of the fresh-state catalytic container oxygen storage model and the degraded-state catalytic converter oxygen storage model.
5. The control strategy for achieving oxygen storage amount compensation for a degradation catalyst of claim 1, wherein: the correction strategy is that when the air-fuel ratio concentration of the oxygen storage model of the degradation-state catalyst is increased, the control unit reduces the supplement of the fuel, so as to adjust the mixing ratio of the air and the fuel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210497562.6A CN114810391A (en) | 2022-04-29 | 2022-04-29 | Control strategy for implementing oxygen storage compensation of degradation catalyst |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210497562.6A CN114810391A (en) | 2022-04-29 | 2022-04-29 | Control strategy for implementing oxygen storage compensation of degradation catalyst |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114810391A true CN114810391A (en) | 2022-07-29 |
Family
ID=82513762
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210497562.6A Pending CN114810391A (en) | 2022-04-29 | 2022-04-29 | Control strategy for implementing oxygen storage compensation of degradation catalyst |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114810391A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000282925A (en) * | 1999-03-31 | 2000-10-10 | Unisia Jecs Corp | Control device for oxygen storage amount of ternary catalyst |
| CN102791982A (en) * | 2010-03-09 | 2012-11-21 | 丰田自动车株式会社 | Catalyst degradation detection apparatus |
| JP2013100750A (en) * | 2011-11-08 | 2013-05-23 | Mitsubishi Electric Corp | Control device of internal combustion engine, and deterioration diagnosis method of catalyst converter |
| CN111022203A (en) * | 2019-12-31 | 2020-04-17 | 潍柴动力股份有限公司 | Method and system for improving catalytic efficiency of aging three-way catalyst |
| CN111188670A (en) * | 2020-04-08 | 2020-05-22 | 潍柴动力股份有限公司 | Three-way catalyst control method and device |
| CN112664342A (en) * | 2020-12-29 | 2021-04-16 | 东风汽车集团有限公司 | Three-way catalyst control method and system |
| CN113107692A (en) * | 2021-05-12 | 2021-07-13 | 潍柴动力股份有限公司 | Emission control method and device of engine and ECU (electronic control Unit) |
-
2022
- 2022-04-29 CN CN202210497562.6A patent/CN114810391A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000282925A (en) * | 1999-03-31 | 2000-10-10 | Unisia Jecs Corp | Control device for oxygen storage amount of ternary catalyst |
| CN102791982A (en) * | 2010-03-09 | 2012-11-21 | 丰田自动车株式会社 | Catalyst degradation detection apparatus |
| JP2013100750A (en) * | 2011-11-08 | 2013-05-23 | Mitsubishi Electric Corp | Control device of internal combustion engine, and deterioration diagnosis method of catalyst converter |
| CN111022203A (en) * | 2019-12-31 | 2020-04-17 | 潍柴动力股份有限公司 | Method and system for improving catalytic efficiency of aging three-way catalyst |
| CN111188670A (en) * | 2020-04-08 | 2020-05-22 | 潍柴动力股份有限公司 | Three-way catalyst control method and device |
| CN112664342A (en) * | 2020-12-29 | 2021-04-16 | 东风汽车集团有限公司 | Three-way catalyst control method and system |
| CN113107692A (en) * | 2021-05-12 | 2021-07-13 | 潍柴动力股份有限公司 | Emission control method and device of engine and ECU (electronic control Unit) |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9359927B2 (en) | Exhaust gas purification system for an internal combustion engine | |
| US7730724B2 (en) | Turbocharger shaft over-speed compensation | |
| US9777659B2 (en) | Control device of internal combustion engine | |
| US8196404B2 (en) | Exhaust gas recirculation system for internal combustion engine and method for controlling the same | |
| US6367462B1 (en) | Engine torque management method with high dilution EGR control | |
| CN106121843B (en) | Environment compensation closed-loop control method for natural gas engine | |
| CN111622853A (en) | Self-adaptive EGR control method based on engine nitrogen and oxygen emission | |
| EP3409915B1 (en) | System and method for improving performance of combustion engines employing primary and secondary fuels | |
| US8381519B2 (en) | Method of stationary regeneration of an engine exhaust particulate filter | |
| US7360525B2 (en) | Control system for internal combustion engine | |
| CN111736456B (en) | Control and diagnostic mechanism for EGR system, heavy duty car and method | |
| US20090118987A1 (en) | Air-fuel ratio control apparatus | |
| US20100126146A1 (en) | Exhaust emission purification controller of internal combustion engine | |
| US20070021901A1 (en) | Control system for internal combustion engine | |
| EP2145092A2 (en) | Internal combustion engine control device | |
| CN112177783A (en) | Low-pressure exhaust gas recirculation system suitable for biodiesel engine and control method | |
| CN115680842A (en) | Controller for a drive train for controlling the ignition time and the air ratio | |
| CN114810391A (en) | Control strategy for implementing oxygen storage compensation of degradation catalyst | |
| CN112324547B (en) | Selective catalytic reduction control method and system suitable for mixed fuel | |
| US20080120965A1 (en) | Exhaust emission control device and method for internal combustion engine, and engine control unit | |
| CN114962023B (en) | EGR valve control method of low-pressure EGR system | |
| EP2497935B1 (en) | Egr control system for internal combustion engine | |
| EP0992667A2 (en) | Internal combustion engine | |
| AU2014326278A1 (en) | Exhaust gas control apparatus and exhaust gas control method for internal-combustion engine | |
| CN114962019B (en) | Engine air inflow correction method and engine system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |