CN114183265B - Gas engine air-fuel ratio control system and method based on catalyst aging model - Google Patents
Gas engine air-fuel ratio control system and method based on catalyst aging model Download PDFInfo
- Publication number
- CN114183265B CN114183265B CN202111270121.4A CN202111270121A CN114183265B CN 114183265 B CN114183265 B CN 114183265B CN 202111270121 A CN202111270121 A CN 202111270121A CN 114183265 B CN114183265 B CN 114183265B
- Authority
- CN
- China
- Prior art keywords
- fuel ratio
- air
- catalytic converter
- aging
- catalyst
- 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.)
- Active
Links
- 230000032683 aging Effects 0.000 title claims abstract description 133
- 239000000446 fuel Substances 0.000 title claims abstract description 124
- 239000003054 catalyst Substances 0.000 title claims abstract description 97
- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000003197 catalytic effect Effects 0.000 claims abstract description 114
- 238000001228 spectrum Methods 0.000 claims abstract description 98
- 238000012937 correction Methods 0.000 claims abstract description 32
- 239000007789 gas Substances 0.000 claims description 63
- 238000004364 calculation method Methods 0.000 claims description 14
- 241000282326 Felis catus Species 0.000 claims description 7
- 239000002737 fuel gas Substances 0.000 claims description 2
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 238000005259 measurement Methods 0.000 claims description 2
- 238000012360 testing method Methods 0.000 description 8
- 238000004590 computer program Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 239000000243 solution Substances 0.000 description 6
- 230000006870 function Effects 0.000 description 5
- 238000012545 processing Methods 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
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
- F02D41/1473—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the regulation method
- F02D41/1475—Regulating the air fuel ratio at a value other than stoichiometry
-
- 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
- F02D41/1446—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 exhaust temperatures
-
- 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
- Y02T10/40—Engine management systems
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The invention provides a gas engine air-fuel ratio control system and a method thereof based on a catalyst aging model, wherein the system comprises a target air-fuel ratio output module, a catalyst efficiency window control module, an air-fuel ratio closed loop correction module and an air-fuel ratio control module; the output end of the target air-fuel ratio output module, the catalyst efficiency window control module and the air-fuel ratio closed loop correction module is electrically connected with the input end of the air-fuel ratio control module; the target air-fuel ratio module outputs a target air-fuel ratio to the air-fuel ratio control module; the catalyst efficiency window control module outputs a catalyst efficiency window pulse spectrum corresponding to the catalyst aging coefficient; the air-fuel ratio closed-loop correction module outputs an air-fuel ratio closed-loop correction coefficient; the air-fuel ratio control module calculates and outputs the air-fuel ratio of the gas engine based on the received catalytic efficiency window pulse spectrum, the target air-fuel ratio and the air-fuel ratio closed loop correction coefficient. The invention can better control the emission and prolong the effective service life of the catalyst.
Description
Technical Field
The invention belongs to the technical field of engines, and particularly relates to a gas engine air-fuel ratio control system and method based on a catalyst aging model.
Background
With the implementation of national six-emission regulations and the popularization of new energy technologies, the technology of natural gas engines is becoming mature. Among the numerous solutions, equivalence ratio combustion mode-matching three-way catalytic converters are one of the current main technical routes. The three-way catalytic converter has higher control requirements on the combustion state and the air-fuel ratio of the engine, and the conversion efficiency and the service life of the three-way catalytic converter can be influenced by factors such as poor combustion, fire, larger air-fuel ratio deviation and the like.
The current air-fuel ratio of the gas engine is mainly controlled based on a target air-fuel ratio, a three-way catalyst efficiency window pulse spectrum and an air-fuel ratio closed loop correction module.
The current gas engine air-fuel ratio control strategy mainly has the following problems:
1. the pulse spectrum of the efficiency window of the catalytic converter is calibrated to be a fixed pulse spectrum, and the influence of the aging of the catalytic converter on the efficiency window of the catalytic converter is not considered.
2. As the catalyst ages, its efficiency window shifts, the risk of emissions exceeding regulatory limits increases, and correspondingly the service life of the catalyst is shortened.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a gas engine air-fuel ratio control system and a method based on a catalyst aging model, which can better control emission and prolong the effective service life of a catalyst.
The technical scheme adopted by the invention is as follows: a gas engine air-fuel ratio control system based on a catalyst aging model is characterized in that: the device comprises a target air-fuel ratio output module, a catalyst efficiency window control module, an air-fuel ratio closed loop correction module and an air-fuel ratio control module; the output end of the target air-fuel ratio output module, the catalyst efficiency window control module and the air-fuel ratio closed loop correction module is electrically connected with the input end of the air-fuel ratio control module; the target air-fuel ratio module outputs a target air-fuel ratio to the air-fuel ratio control module; the catalyst efficiency window control module outputs a catalyst efficiency window pulse spectrum corresponding to the catalyst aging coefficient; the air-fuel ratio closed-loop correction module outputs an air-fuel ratio closed-loop correction coefficient; the air-fuel ratio control module calculates and outputs the air-fuel ratio of the gas engine based on the received catalytic efficiency window pulse spectrum, the target air-fuel ratio and the air-fuel ratio closed loop correction coefficient.
In the above technical scheme, the catalyst efficiency window control module comprises a gas engine catalytic converter aging model generation module, a catalytic converter aging coefficient calculation module and a catalyst efficiency window pulse spectrum matching module; the aging coefficient calculation module of the catalytic converter calculates the aging coefficient of the catalytic converter based on the aging model of the catalytic converter of the gas engine; the catalytic converter efficiency window pulse spectrum matching module matches corresponding catalytic converter efficiency window pulse spectrums based on the calculated aging coefficient of the catalytic converter and outputs the catalytic converter efficiency window pulse spectrums.
In the above technical scheme, the gas engine catalytic converter aging model generation module establishes a gas engine catalytic converter aging model based on the exhaust temperature, the exhaust flow and the running time of the gas engine; the gas engine catalytic converter aging model is based on an aging pulse spectrum of the catalytic converter, the abscissa of the aging pulse spectrum is the exhaust temperature, the ordinate of the aging pulse spectrum is the exhaust flow, and the pulse spectrum value represents the basic aging coefficient.
In the above technical scheme, the aging coefficient calculation module of the catalytic converter calculates the aging coefficient of the catalytic converter by adopting the following formula:
wherein: l1, L2 and Li represent corresponding working condition aging coefficients obtained based on a basic aging pulse spectrum of the catalytic converter; t is t 1 、t 2 、t i Representing the running time of the corresponding working condition; Σt represents the total run time.
In the technical scheme, the catalyst efficiency window pulse spectrum matching module calculates a threshold value of a catalyst aging coefficient grading interval based on the engine speed and the load.
In the above technical scheme, the catalyst efficiency window pulse spectrum matching module sets the catalyst efficiency window pulse spectrum matched with each interval based on the catalyst aging coefficient classification interval.
In the above technical scheme, the catalyst efficiency window pulse spectrum matching module judges the classification interval of the calculated aging coefficient value of the catalytic converter, and outputs the catalyst efficiency window pulse spectrum corresponding to the classification interval.
In the above technical scheme, the air-fuel ratio control module calculates and outputs the air-fuel ratio of the gas engine based on the received catalytic converter efficiency window pulse spectrum, the target air-fuel ratio and the air-fuel ratio closed loop correction coefficient.
The invention also provides a gas engine air-fuel ratio control method based on the catalyst aging model, which is characterized by comprising the following steps of: the method comprises the following steps:
based on the exhaust temperature, the exhaust flow and the accumulated running time of the corresponding working conditions of the gas engine, establishing an aging model of the catalytic converter of the gas engine;
based on a catalytic converter aging model of the gas engine, calculating to obtain an aging coefficient of the catalytic converter;
matching corresponding catalyst efficiency window pulse spectrums according to the grading interval corresponding to the aging coefficient of the catalyst;
based on the catalytic converter efficiency window pulse spectrum, the target air-fuel ratio and the air-fuel ratio closed loop correction coefficient, the air-fuel ratio output value of the gas engine is calculated.
The present invention also provides a computer-readable storage medium characterized in that: the computer readable storage medium stores a gas engine air-fuel ratio control method program based on a catalyst aging model, and the gas engine air-fuel ratio control program based on the catalyst aging model realizes the steps of the gas engine air-fuel ratio control method based on the catalyst aging model in the technical scheme when being executed by a vehicle controller.
The beneficial effects of the invention are as follows: the invention provides a gas engine air-fuel ratio control strategy based on a catalyst aging model, which is used for ensuring that a more proper catalyst efficiency window pulse spectrum is matched with the aging of a catalyst in the operation process of a gas engine. Compared with the prior art, the invention can better control the emission and prolong the effective service life of the catalyst. According to the invention, the aging model of the catalyst is established based on the exhaust temperature, the exhaust flow and the accumulated running time of the corresponding working conditions of the gas engine, and the aging model of the catalyst can effectively reflect the working conditions of the engine. According to the aging model of the catalyst, the aging coefficient of the catalyst can be obtained, and the aging coefficient of the catalyst obtained by the method effectively represents the working condition of the engine. According to the invention, the aging coefficients of the catalyst are defined in a grading manner, and the corresponding catalyst efficiency window pulse spectrum is matched according to the grading, so that the output catalyst efficiency window pulse spectrum can be more suitable for the actual requirements of the current running state of the transmitter.
Drawings
FIG. 1 is a schematic illustration of the present invention;
FIG. 2 is a schematic diagram of a catalyst efficiency window control module according to the present invention.
Detailed Description
The invention will now be described in further detail with reference to the drawings and specific examples, which are given for clarity of understanding and are not to be construed as limiting the invention.
As shown in FIG. 1, the invention provides a gas engine air-fuel ratio control system based on a catalyst aging model, which comprises a target air-fuel ratio output module, a catalyst efficiency window control module, an air-fuel ratio closed loop correction module and an air-fuel ratio control module; the output end of the target air-fuel ratio output module, the catalyst efficiency window control module and the air-fuel ratio closed loop correction module is electrically connected with the input end of the air-fuel ratio control module; the target air-fuel ratio module outputs a target air-fuel ratio to the air-fuel ratio control module; the catalyst efficiency window control module outputs a catalyst efficiency window pulse spectrum corresponding to the catalyst aging coefficient; the air-fuel ratio closed-loop correction module outputs an air-fuel ratio closed-loop correction coefficient; the air-fuel ratio control module calculates and outputs the air-fuel ratio of the gas engine based on the received catalytic efficiency window pulse spectrum, the target air-fuel ratio and the air-fuel ratio closed loop correction coefficient.
In the above technical scheme, the catalyst efficiency window control module comprises a gas engine catalytic converter aging model generation module, a catalytic converter aging coefficient calculation module and a catalyst efficiency window pulse spectrum matching module; the aging coefficient calculation module of the catalytic converter calculates the aging coefficient of the catalytic converter based on the aging model of the catalytic converter of the gas engine; the catalytic converter efficiency window pulse spectrum matching module matches corresponding catalytic converter efficiency window pulse spectrums based on the calculated aging coefficient of the catalytic converter and outputs the catalytic converter efficiency window pulse spectrums.
In the above technical scheme, the gas engine catalytic converter aging model generation module establishes a gas engine catalytic converter aging model based on the exhaust temperature, the exhaust flow and the running time of the gas engine; aging model M of gas engine catalytic converter cat Based on the aging pulse spectrum of the catalytic converter, the abscissa of the aging pulse spectrum is the exhaust temperature T exh The ordinate is the exhaust flow G exh The pulse spectrum value represents the basic aging coefficient L 0 。
The basic catalytic converter aging pulse profile is shown in the schematic table below:
| x/y | 200 | 250 | 300 | 350 | 400 | 450 | 500 | 550 | 600 | 650 | 700 | 750 | 800 | 850 | 900 |
| 200 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 |
| 300 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 |
| 400 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 |
| 500 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 |
| 600 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 |
| 700 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 |
| 800 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 |
| 900 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 |
| 1000 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 |
| 1100 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 |
| 1200 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 |
| 1300 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 |
| 1400 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 |
| 1500 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 | 1.005 |
in the above table, the abscissa x is the exhaust temperature T exh The ordinate y is the exhaust flow G exh The pulse spectrum value represents the corresponding basic aging coefficient L 0 (example).
The basic aging coefficient is obtained by the following method: in single-product laboratories of catalytic converters, air reaching a certain condition (temperature and flow rate) is used to pass through the catalytic converter, i.e. by artificial manufacture conditionsTo achieve the purpose of aging the catalytic converter. The aging time was 100 hours, and at 0 hours and 100 hours, emission tests were performed by mounting a corresponding catalytic converter in an engine room. Recording corresponding engine system emissions G 0 、G 100 Basic aging coefficient L of the catalyst 0 The method is calculated by adopting the following formula:
L 0 ＝G 100 /G 0
G 0 、G 100 the emissions of emissions resulting from the engine (with aftertreatment) operating the corresponding emissions control cycle are shown at 0 hours and 100 hours, respectively.
In the above technical solution, the aging coefficient calculation module of the catalytic converter calculates the aging coefficient L of the catalytic converter using the following formula α ：
Wherein: l1, L2 and Li represent corresponding working condition aging coefficients obtained based on a basic aging pulse spectrum of the catalytic converter; t is t 1 、t 2 、t i Representing the running time of the corresponding working condition; Σt represents the total run time. Wherein i is an integer, and the value of i can be set according to actual calculation requirements.
According to the abscissa and ordinate of the aging pulse spectrum of the basic catalytic converter, the operation working condition of the engine is defined in a partitioning mode, and L1, L2 and Li are obtained by directly reading corresponding pulse spectrum values. Setting a corresponding timer Ti for each partition to calculate the running time of the engine in the region, t 1 、t 2 、t i I.e. the calculation result of the corresponding timer.
In the technical scheme, the catalyst efficiency window pulse spectrum matching module calculates a threshold value of a catalyst aging coefficient grading interval based on the engine speed and the load.
The threshold value of the classification section is obtained by a durability test of the catalytic converter (classification is carried out according to different model requirements and durability test conditions), and is as follows: after a durability test of 0 hours, 250 hoursThe emissions of the engine-on-catalyst system, i.e. the emissions G of emissions resulting from the engine (with aftertreatment) operating the corresponding emissions regulation cycle, were tested at 500 hours, 750 hours and 1000 hours, respectively 0 、G 250 、G 500 、G 750 、G 1000 The initial threshold is 1, and the first threshold Y1 is calculated by the following formula:
Y1＝G 250 /G 0
the second threshold Y2 is calculated by the following formula:
Y2＝G 500 /G 0
according to different models and durability test conditions, the thresholds Y3, Y4 and the like can be obtained by subspecies.
In the above technical scheme, the catalyst efficiency window pulse spectrum matching module sets the catalyst efficiency window pulse spectrum matched with each interval based on the catalyst aging coefficient classification interval.
The catalyst efficiency window pulse spectrums M1, M2, M3 and the like corresponding to each interval are obtained by specific test calibration, and are as follows: and respectively testing the air-fuel ratio level of the catalytic converter when the conversion efficiency is highest under each working condition in the durability test of the catalytic converter for 0 hour, 250 hours, 500 hours, 750 hours and 1000 hours, so as to obtain the optimal efficiency window pulse spectrum of the catalytic converter at the moment. The efficiency window pulse spectrum corresponding to 0 hours is defined as M1, the efficiency window corresponding to 250 hours is defined as M2, and so on.
In the above technical scheme, the catalyst efficiency window pulse spectrum matching module judges the classification interval of the calculated aging coefficient value of the catalytic converter, and outputs the catalyst efficiency window pulse spectrum corresponding to the classification interval.
Specifically, when the aging coefficient L of the catalytic converter α When the pulse frequency is more than or equal to 1 and less than a first threshold L1, a first pulse spectrum M is output 1 As a catalytic converter efficiency window pulse spectrum M x 。
Coefficient of aging L when catalytic converter α When the pulse frequency is greater than or equal to a first threshold L1 and less than a second threshold L2, a second pulse spectrum M is output 2 As a catalytic efficiency window pulseSpectrum M x 。
Coefficient of aging L when catalytic converter α When the pulse width is larger than or equal to the second threshold L2 and smaller than the third threshold L3, a third pulse spectrum M is output 3 As a catalytic converter efficiency window pulse spectrum M x 。
In the above technical scheme, the air-fuel ratio control module calculates and outputs the air-fuel ratio of the gas engine based on the received catalytic converter efficiency window pulse spectrum, the target air-fuel ratio and the air-fuel ratio closed loop correction coefficient.
Air-fuel ratio L of gas engine lam The calculation formula of (2) is as follows:
in the above, L lams Represents a target air-fuel ratio, L laso Representing an air-fuel ratio correction value obtained based on the catalyst efficiency window pulse spectrum, and f represents an air-fuel ratio closed-loop correction coefficient.
The invention also provides a gas engine air-fuel ratio control method based on the catalyst aging model, which is characterized by comprising the following steps of: the method comprises the following steps:
s1, exhaust temperature T based on gas engine exh Flow rate of exhaust gas G exh And the accumulated running time t of the corresponding working condition, and establishing an aging model M of the catalytic converter of the gas engine cat The method comprises the steps of carrying out a first treatment on the surface of the Aging model M of gas engine catalytic converter cat Based on the aging pulse spectrum of the catalytic converter, the abscissa of the aging pulse spectrum is the exhaust temperature T exh The ordinate is the exhaust flow G exh The pulse spectrum value represents the basic aging coefficient L 0 。
The engine is provided with an exhaust temperature sensor and an air inlet flow sensor, and the measured value of the exhaust temperature sensor is T exh . The exhaust flow is obtained by the following formula:
G exh ＝G air +G fuel
wherein G is air Is the actual measurement value of the air inlet flow sensor, G fuel The fuel consumption calculated for the fuel gas injection system model.
S2, catalytic converter aging model M based on gas engine cat Calculating the ageing coefficient L of the catalytic converter α ；
The aging coefficient of the catalytic converter was calculated using the following formula:
wherein: l1, L2 and Li represent corresponding working condition aging coefficients obtained based on a basic aging pulse spectrum of the catalytic converter; t is t 1 、t 2 、t i Representing the running time of the corresponding working condition; Σt represents the total run time.
S3, matching corresponding catalyst efficiency window pulse spectrums according to the grading interval corresponding to the aging coefficient of the catalyst;
specifically, when the aging coefficient lα of the catalytic converter is 1 or more and less than the first threshold Y1, the first pulse spectrum M1 is output as the catalyst efficiency window pulse spectrum Mx.
When the aging coefficient lα of the catalytic converter is greater than or equal to the first threshold value Y1 and less than the second threshold value Y2, the second pulse spectrum M2 is output as the catalytic efficiency window pulse spectrum Mx.
When the aging coefficient lα of the catalytic converter is greater than or equal to the second threshold value Y2 and less than the third threshold value Y3, the third pulse spectrum M3 is output as the catalytic efficiency window pulse spectrum Mx.
S4, calculating to obtain the air-fuel ratio output value of the gas engine based on the catalytic converter efficiency window pulse spectrum, the target air-fuel ratio and the air-fuel ratio closed loop correction coefficient.
Air-fuel ratio L of gas engine lam The calculation formula of (2) is as follows:
in the above, L lams Represents a target air-fuel ratio, L laso Represents an air-fuel ratio correction value obtained based on a catalyst efficiency window pulse spectrum, and f represents an air-fuel ratio closed loop correction coefficient。
The present invention also provides a computer-readable storage medium characterized in that: the computer readable storage medium stores a gas engine air-fuel ratio control method program based on a catalyst aging model, and the gas engine air-fuel ratio control program based on the catalyst aging model realizes the steps of the gas engine air-fuel ratio control method based on the catalyst aging model in the technical scheme when being executed by a vehicle controller.
Here, it should be noted that the description of the above technical solution is exemplary, and the present specification may be embodied in different forms and should not be construed as being limited to the technical solution set forth herein. Rather, these descriptions will be provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Furthermore, the technical solution of the invention is limited only by the scope of the claims.
The shapes, dimensions, ratios, angles, and numbers disclosed for describing aspects of the present specification and claims are merely examples, and thus, the present specification and claims are not limited to the details shown. In the following description, a detailed description of related known functions or configurations will be omitted when it may be determined that the emphasis of the present specification and claims is unnecessarily obscured.
Where the terms "comprising," "having," and "including" are used in this specification, there may be additional or alternative parts unless the use is made, the terms used may generally be in the singular but may also mean the plural.
It should be noted that although the terms "first," "second," "top," "bottom," "one side," "another side," "one end," "the other end," etc. may be used and used in this specification to describe various components, these components and portions should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, with top and bottom elements, under certain circumstances, also being interchangeable or convertible with one another; the components at one end and the other end may be the same or different in performance from each other.
In addition, when constituting the components, although not explicitly described, it is understood that a certain error region is necessarily included.
In describing positional relationships, for example, when positional sequences are described as "on," "above," "below," and "next," unless words or terms such as "just" or "directly" are used, it is also possible to include cases where there is no contact or contact between them. If a first element is referred to as being "on" a second element, it does not mean that the first element must be located above the second element in the figures. The upper and lower portions of the component will change in response to changes in the angle and orientation of the view. Thus, in the drawings or in actual construction, if it is referred to that a first element is "on" a second element, it can comprise the case that the first element is "under" the second element and the case that the first element is "over" the second element. In describing the time relationship, unless "just" or "direct" is used, a case where there is no discontinuity between steps may be included in describing "after", "subsequent" and "preceding". The features of the various embodiments of the invention may be combined or spliced with one another, either in part or in whole, and may be implemented in a variety of different configurations as will be well understood by those skilled in the art. Embodiments of the invention may be performed independently of each other or may be performed together in an interdependent relationship
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It should be finally understood that the foregoing embodiments are merely illustrative of the technical solutions of the present invention and not limiting the scope of protection thereof, and although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that various changes, modifications or equivalents may be made to the specific embodiments of the invention, and these changes, modifications or equivalents are within the scope of protection of the claims appended hereto.
What is not described in detail in this specification is prior art known to those skilled in the art.
Claims (4)
1. A gas engine air-fuel ratio control system based on a catalyst aging model is characterized in that: the device comprises a target air-fuel ratio output module, a catalyst efficiency window control module, an air-fuel ratio closed loop correction module and an air-fuel ratio control module; the output end of the target air-fuel ratio output module, the catalyst efficiency window control module and the air-fuel ratio closed loop correction module is electrically connected with the input end of the air-fuel ratio control module; the target air-fuel ratio module outputs a target air-fuel ratio to the air-fuel ratio control module; the catalyst efficiency window control module outputs a catalyst efficiency window pulse spectrum corresponding to the catalyst aging coefficient; the air-fuel ratio closed-loop correction module outputs an air-fuel ratio closed-loop correction coefficient; the air-fuel ratio control module calculates and obtains the air-fuel ratio of the gas engine based on the received catalytic converter efficiency window pulse spectrum, the target air-fuel ratio and the air-fuel ratio closed loop correction coefficient and outputs the air-fuel ratio;
the catalyst efficiency window control module comprises a gas engine catalytic converter aging model generation module, a catalytic converter aging coefficient calculation module and a catalyst efficiency window pulse spectrum matching module; the aging coefficient calculation module of the catalytic converter calculates the aging coefficient of the catalytic converter based on the aging model of the catalytic converter of the gas engine; the catalytic converter efficiency window pulse spectrum matching module matches corresponding catalytic converter efficiency window pulse spectrums based on the calculated aging coefficient of the catalytic converter and outputs the catalytic converter efficiency window pulse spectrums;
the gas engine catalytic converter aging model generation module establishes a gas engine catalytic converter aging model based on the exhaust temperature, the exhaust flow and the running time of the gas engine; the gas engine catalytic converter aging model is used as a basic catalytic converter aging pulse spectrum, the abscissa of which is the exhaust temperature, the ordinate of which is the exhaust flow, and the pulse spectrum value represents a basic aging coefficient;
the aging coefficient calculation module of the catalytic converter calculates the aging coefficient of the catalytic converter by adopting the following formula:
wherein: l1, L2 and Li represent corresponding working condition aging coefficients obtained based on a basic aging pulse spectrum of the catalytic converter; t1, t2 and ti represent the running time of the corresponding working conditions; Σt represents the total run time;
the catalyst efficiency window pulse spectrum matching module sets catalyst efficiency window pulse spectrums matched with each interval based on the catalyst aging coefficient classification interval:
when the aging coefficient Lalpha of the catalytic converter is more than or equal to 1 and less than a first threshold Y1, outputting a first pulse spectrum M1 as a catalytic converter efficiency window pulse spectrum Mx;
when the aging coefficient Lalpha of the catalytic converter is larger than or equal to a first threshold Y1 and smaller than a second threshold Y2, outputting a second pulse spectrum M2 as a catalytic converter efficiency window pulse spectrum Mx;
when the aging coefficient lα of the catalytic converter is greater than or equal to the second threshold value Y2 and less than the third threshold value Y3, the third pulse spectrum M3 is output as the catalytic efficiency window pulse spectrum Mx.
2. The gas engine air-fuel ratio control system based on a catalyst aging model according to claim 1, wherein: the catalyst efficiency window pulse spectrum matching module calculates a threshold value of a catalyst aging coefficient grading interval based on the engine speed and the load.
3. A gas engine air-fuel ratio control method based on a catalyst aging model is characterized by comprising the following steps of: the method comprises the following steps:
s1, exhaust temperature T based on gas engine exh Flow rate of exhaust gas G exh And the accumulated running time t of the corresponding working condition, and establishing an aging model M of the catalytic converter of the gas engine cat The method comprises the steps of carrying out a first treatment on the surface of the Aging model M of gas engine catalytic converter cat Aging pulse spectrum of catalytic converter basedThe abscissa thereof is the exhaust temperature T exh The ordinate is the exhaust flow G exh Pulse spectrum values represent basic aging coefficients;
the engine is provided with an exhaust temperature sensor and an air inlet flow sensor, and the measured value of the exhaust temperature sensor is T exh The method comprises the steps of carrying out a first treatment on the surface of the The exhaust flow is obtained by the following formula:
G exh ＝G air +G fuel
wherein G is air Is the actual measurement value of the air inlet flow sensor, G fuel The fuel consumption calculated for the fuel gas injection system model;
s2, catalytic converter aging model M based on gas engine cat Calculating the ageing coefficient L of the catalytic converter α ；
The aging coefficient of the catalytic converter was calculated using the following formula:
wherein: l1, L2 and Li represent corresponding working condition aging coefficients obtained based on a basic aging pulse spectrum of the catalytic converter; t is t 1 、t 2 、t i Representing the running time of the corresponding working condition; Σt represents the total run time;
s3, matching corresponding catalyst efficiency window pulse spectrums according to the grading interval corresponding to the aging coefficient of the catalyst;
specifically, when the aging coefficient lα of the catalytic converter is 1 or more and less than the first threshold Y1, the first pulse spectrum M1 is output as the catalyst efficiency window pulse spectrum Mx;
when the aging coefficient Lalpha of the catalytic converter is larger than or equal to a first threshold Y1 and smaller than a second threshold Y2, outputting a second pulse spectrum M2 as a catalytic converter efficiency window pulse spectrum Mx;
when the aging coefficient Lα of the catalytic converter is greater than or equal to the second threshold Y2 and less than the third threshold Y3, outputting a third pulse spectrum M3 as a catalytic efficiency window pulse spectrum Mx;
s4, calculating an air-fuel ratio output value of the gas engine based on the catalytic converter efficiency window pulse spectrum, the target air-fuel ratio and the air-fuel ratio closed loop correction coefficient;
air-fuel ratio L of gas engine lam The calculation formula of (2) is as follows:
in the above, L lams Represents a target air-fuel ratio, L laso Representing an air-fuel ratio correction value obtained based on the catalyst efficiency window pulse spectrum, and f represents an air-fuel ratio closed-loop correction coefficient.
4. A computer-readable storage medium, characterized by: the computer-readable storage medium has stored thereon a catalyst aging model-based gas-engine air-fuel ratio control method program, which when executed by a vehicle controller, implements the steps of the catalyst aging model-based gas-engine air-fuel ratio control method of claim 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111270121.4A CN114183265B (en) | 2021-10-29 | 2021-10-29 | Gas engine air-fuel ratio control system and method based on catalyst aging model |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111270121.4A CN114183265B (en) | 2021-10-29 | 2021-10-29 | Gas engine air-fuel ratio control system and method based on catalyst aging model |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114183265A CN114183265A (en) | 2022-03-15 |
| CN114183265B true CN114183265B (en) | 2024-03-08 |
Family
ID=80601695
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111270121.4A Active CN114183265B (en) | 2021-10-29 | 2021-10-29 | Gas engine air-fuel ratio control system and method based on catalyst aging model |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114183265B (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0544453A (en) * | 1991-08-19 | 1993-02-23 | Nissan Motor Co Ltd | Air-fuel ratio control device of engine |
| GB9405430D0 (en) * | 1993-03-19 | 1994-05-04 | Nissan Motor | Engine air-fuel ratio controller |
| JPH06264787A (en) * | 1993-03-12 | 1994-09-20 | Nissan Motor Co Ltd | Air-fuel ratio control device of internal combustion engine |
| US5398501A (en) * | 1992-10-20 | 1995-03-21 | Honda Giken Kogyo K.K. (Honda Motor Co., Ltd. In English) | Air-fuel ratio control system for internal combustion engines |
| JP2001059412A (en) * | 1999-08-19 | 2001-03-06 | Toyota Motor Corp | Control device for internal combustion engine |
| JP2003206784A (en) * | 2002-01-16 | 2003-07-25 | Mazda Motor Corp | Air-fuel ratio control device of engine |
| CN1936292A (en) * | 2001-06-18 | 2007-03-28 | 丰田自动车株式会社 | Air/fuel ratio control device for internal combustion engine |
| JP2011252472A (en) * | 2010-06-04 | 2011-12-15 | Hitachi Automotive Systems Ltd | Control device of engine |
| CN111005815A (en) * | 2018-10-04 | 2020-04-14 | 罗伯特·博世有限公司 | Method for adjusting the filling level of a reservoir of a catalytic converter for exhaust gas components as a function of the aging of the catalytic 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 |
| WO2021183322A1 (en) * | 2020-03-12 | 2021-09-16 | Cummins Emission Solutions Inc. | Controller and method for controlling operation of an aftertreatment system based on short-term and long-term cumulative degradation estimates |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4450326B2 (en) * | 2005-10-06 | 2010-04-14 | 日立オートモティブシステムズ株式会社 | Air-fuel ratio control device and air-fuel ratio control method for internal combustion engine |
-
2021
- 2021-10-29 CN CN202111270121.4A patent/CN114183265B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0544453A (en) * | 1991-08-19 | 1993-02-23 | Nissan Motor Co Ltd | Air-fuel ratio control device of engine |
| US5398501A (en) * | 1992-10-20 | 1995-03-21 | Honda Giken Kogyo K.K. (Honda Motor Co., Ltd. In English) | Air-fuel ratio control system for internal combustion engines |
| JPH06264787A (en) * | 1993-03-12 | 1994-09-20 | Nissan Motor Co Ltd | Air-fuel ratio control device of internal combustion engine |
| GB9405430D0 (en) * | 1993-03-19 | 1994-05-04 | Nissan Motor | Engine air-fuel ratio controller |
| JP2001059412A (en) * | 1999-08-19 | 2001-03-06 | Toyota Motor Corp | Control device for internal combustion engine |
| CN1936292A (en) * | 2001-06-18 | 2007-03-28 | 丰田自动车株式会社 | Air/fuel ratio control device for internal combustion engine |
| JP2003206784A (en) * | 2002-01-16 | 2003-07-25 | Mazda Motor Corp | Air-fuel ratio control device of engine |
| JP2011252472A (en) * | 2010-06-04 | 2011-12-15 | Hitachi Automotive Systems Ltd | Control device of engine |
| CN111005815A (en) * | 2018-10-04 | 2020-04-14 | 罗伯特·博世有限公司 | Method for adjusting the filling level of a reservoir of a catalytic converter for exhaust gas components as a function of the aging of the catalytic 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 |
| WO2021183322A1 (en) * | 2020-03-12 | 2021-09-16 | Cummins Emission Solutions Inc. | Controller and method for controlling operation of an aftertreatment system based on short-term and long-term cumulative degradation estimates |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114183265A (en) | 2022-03-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2413205B1 (en) | Controller for plant | |
| JP4319461B2 (en) | NOx emission control system using virtual sensor | |
| US7357822B2 (en) | Filter control apparatus | |
| US20130085733A1 (en) | NOx EMISSION ESTIMATION METHOD AND ARRANGEMENT | |
| CN106121793B (en) | The method and apparatus of NOx content in exhaust gas feedstream for determining internal combustion engine | |
| KR20160115799A (en) | Systems and methods for monitoring the health of a selective catalytic reduction catalyst | |
| CN103362620A (en) | System and method for controlling exhaust system having selective catalyst reduction component | |
| CN109072791B (en) | Method and device for controlling aftertreatment system and engine system | |
| JP2005320962A (en) | Exhaust emission control device of internal combustion engine | |
| CN110582628B (en) | Method for filtering and correcting oscillation of abundance signal from detector | |
| US20140056788A1 (en) | Method for the model-based feedback control of an scr system having at least one scr catalytic converter | |
| WO2015122443A1 (en) | Exhaust purification device and control method for exhaust purification device | |
| CN102230426B (en) | Fault diagnosis and compensation method for oxygen sensor | |
| CN104929743A (en) | System to monitor regeneration frequency of particulate filter | |
| EP3249186B1 (en) | Exhaust purification system and catalyst regeneration method | |
| US11680518B2 (en) | Engine and emissions control system | |
| CN105683549A (en) | Engine-out emissions controls | |
| CN114183265B (en) | Gas engine air-fuel ratio control system and method based on catalyst aging model | |
| CN105626216B (en) | Internal combustion engine and corresponding method and apparatus with selective catalytic reduction system operating | |
| CN111177864B (en) | Particle swarm optimization-based internal combustion engine combustion model parameter optimization method and device | |
| US20180073413A1 (en) | NOx OCCLUSION AMOUNT ESTIMATING DEVICE AND NOx OCCLUSION AMOUNT ESTIMATING METHOD | |
| JP2011185097A (en) | Air-fuel ratio detecting device | |
| JP2015190397A (en) | Internal combustion engine soot emission estimation device | |
| CN114861309A (en) | Vehicle emission calibration method and device | |
| JP2013133734A (en) | Internal combustion engine control device |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |