CN114183265A - 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
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- 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
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- 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
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Abstract
The invention provides a gas engine air-fuel ratio control system and a method thereof based on a catalyst aging model, comprising 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 ends of the target air-fuel ratio output module, the catalyst efficiency window control module and the air-fuel ratio closed-loop correction module are electrically connected with the input end of the air-fuel ratio control module; the target air-fuel ratio module outputs the 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; and the air-fuel ratio control module calculates and outputs the air-fuel ratio of the gas engine based on the received catalyst 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 catalytic converter.
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 the national six-emission regulations and the popularization of new energy technologies, the technology of the natural gas engine is mature day by day. Among the numerous solutions, an equivalence ratio combustion mode-matched three-way catalytic converter is one of the current major technical routes. The three-way catalytic converter has high control requirements on the combustion state and the air-fuel ratio of the engine, and factors such as poor combustion, fire, large air-fuel ratio deviation and the like influence the conversion efficiency and the service life of the three-way catalytic converter.
The air-fuel ratio of the current gas engine is mainly controlled based on a target air-fuel ratio, an efficiency window pulse spectrum of a three-way catalytic converter 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 efficiency window pulse spectrum of the catalyst is calibrated to be a fixed value pulse spectrum, and the influence of the aging of the catalytic converter on the efficiency window of the catalyst is not considered.
2. As the catalyst ages, its efficiency window shifts, increasing the risk of emissions exceeding regulatory limits, and correspondingly shortening the useful life of the catalyst.
Disclosure of Invention
The invention aims to solve the defects of the background technology, and provides a gas engine air-fuel ratio control system and a method thereof based on a catalyst aging model, which can better control the emission and prolong the effective service life of a catalyst.
The technical scheme adopted by the invention is as follows: the utility model provides a gas engine air-fuel ratio control system based on catalyst converter model that ages which 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 ends of the target air-fuel ratio output module, the catalyst efficiency window control module and the air-fuel ratio closed-loop correction module are electrically connected with the input end of the air-fuel ratio control module; the target air-fuel ratio module outputs the 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; and the air-fuel ratio control module calculates and outputs the air-fuel ratio of the gas engine based on the received catalyst efficiency window pulse spectrum, the target air-fuel ratio and the air-fuel ratio closed-loop correction coefficient.
In the 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 gas engine catalytic converter aging model generating module establishes a gas engine catalytic converter aging model based on the running state information of the gas engine, and the aging coefficient calculating module of the catalytic converter calculates the aging coefficient of the catalytic converter based on the gas engine catalytic converter aging model; and the catalyst efficiency window pulse spectrum matching module matches and outputs the corresponding catalyst efficiency window pulse spectrum based on the aging coefficient of the catalytic converter obtained by calculation.
In the technical scheme, the aging model generation module of the gas engine catalytic converter establishes an aging model of the gas engine catalytic converter based on the exhaust temperature, the exhaust flow and the operation time of the gas engine; the aging model of the gas engine catalytic converter is a basic aging pulse spectrum of the catalytic converter, the abscissa of the aging model is exhaust temperature, the ordinate of the aging model is exhaust flow, and a pulse spectrum value represents a basic aging coefficient.
In the above technical solution, the aging coefficient calculation module of the catalytic converter calculates the aging coefficient of the catalytic converter by using the following formula:
in the formula: l1, L2 and Li represent corresponding working condition aging coefficients obtained based on a basic aging pulse spectrum of the catalytic converter; t is t1、t2、tiRepresenting the running time of the corresponding working condition; Σ t represents the total running time.
In the technical scheme, the catalyst efficiency window pulse spectrum matching module calculates the threshold value of the catalyst aging coefficient grading interval based on the engine speed and the load.
In the 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 grading interval.
In the technical scheme, the catalyst efficiency window pulse spectrum matching module judges the classification interval to which the aging coefficient value of the catalytic converter obtained by calculation belongs, and outputs the catalyst efficiency window pulse spectrum corresponding to the classification interval.
In the technical scheme, the air-fuel ratio control module calculates and outputs the air-fuel ratio of the gas engine based on the received catalyst 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: the method comprises the following steps:
establishing an aging model of the catalytic converter of the gas engine based on the exhaust temperature and the exhaust flow of the gas engine and the accumulated running time of corresponding working conditions;
calculating an aging coefficient of the catalytic converter based on an aging model of the catalytic converter of the gas engine;
matching a corresponding catalyst efficiency window pulse spectrum according to a grading interval corresponding to the aging coefficient of the catalyst;
and calculating to obtain an air-fuel ratio output value of the gas engine based on the catalyst efficiency window pulse spectrum, the target air-fuel ratio and the 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 has stored thereon a program of a catalyst aging model-based gas engine air-fuel ratio control method, which when executed by a vehicle controller implements the steps of the catalyst aging model-based gas engine air-fuel ratio control method of the above-described aspect.
The invention has the beneficial effects that: 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 appropriate 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. The aging model of the catalyst is established based on the exhaust temperature and the exhaust flow of the gas engine and the accumulated running time of corresponding working conditions, and the aging model of the catalyst can effectively reflect the current working conditions of the engine. According to the method, the aging coefficient of the catalyst can be obtained according to the aging model of the catalyst, and the aging coefficient of the catalyst obtained by the method effectively reflects the current working condition of the engine. The invention defines the aging coefficient of the catalyst in a grading way, and matches the corresponding catalyst efficiency window pulse spectrum according to the grading, so that the output catalyst efficiency window pulse spectrum can better adapt to the actual requirement of the running state of the current transmitter.
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FIG. 1 is a schematic view of the present invention;
FIG. 2 is a schematic diagram of a catalyst efficiency window control module of the present invention.
Detailed Description
The invention will be further described in detail with reference to the following drawings and specific examples, which are not intended to limit the invention, but are for clear understanding.
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 ends of the target air-fuel ratio output module, the catalyst efficiency window control module and the air-fuel ratio closed-loop correction module are electrically connected with the input end of the air-fuel ratio control module; the target air-fuel ratio module outputs the 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; and the air-fuel ratio control module calculates and outputs the air-fuel ratio of the gas engine based on the received catalyst efficiency window pulse spectrum, the target air-fuel ratio and the air-fuel ratio closed-loop correction coefficient.
In the 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 gas engine catalytic converter aging model generating module establishes a gas engine catalytic converter aging model based on the running state information of the gas engine, and the aging coefficient calculating module of the catalytic converter calculates the aging coefficient of the catalytic converter based on the gas engine catalytic converter aging model; and the catalyst efficiency window pulse spectrum matching module matches and outputs the corresponding catalyst efficiency window pulse spectrum based on the aging coefficient of the catalytic converter obtained by calculation.
In the technical scheme, the aging model generation module of the gas engine catalytic converter establishes an aging model of the gas engine catalytic converter based on the exhaust temperature, the exhaust flow and the operation time of the gas engine; aging model M of catalytic converter of gas enginecatAging pulse spectrum of the basic catalytic converter, the abscissa of which is the exhaust temperature TexhThe ordinate is the exhaust flow GexhThe pulse spectrum value represents the basic aging coefficient L0。
The aging pulse spectrum of the basic catalytic converter is shown as follows:
| 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 TexhOn the ordinate y the exhaust gas flow GexhThe pulse spectrum value represents the corresponding basic aging coefficient L0(example).
The basic aging coefficient is obtained by the following method: in the catalytic converter single-product laboratory, air reaching certain conditions (temperature and flow) is used for passing through the catalytic converter, namely, the aim of aging the catalytic converter is achieved through artificial manufacturing conditions. The aging time was 100 hours, and at 0 hours and 100 hours, the engine test room was equipped with the corresponding catalytic converter for emission test. Recording corresponding engine system emissions G0、G100Basic aging factor L of the catalyst0The formula is as follows:
L0＝G100/G0
G0、G100representing emissions of emissions obtained by operating the engine (with after-treatment) for the corresponding emissions regulation cycle 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 formulaα：
In the formula: l1, L2, Li represent the corresponding obtained based on the basic aging pulse spectrum of the catalytic converterWorking condition aging coefficient; t is t1、t2、tiRepresenting the running time of the corresponding working condition; Σ t represents the total running time. Wherein i is an integer, and the value can be set according to the actual calculation requirement.
And according to the horizontal and vertical coordinates of the aging pulse spectrum of the basic catalytic converter, the operation condition of the engine is defined in a partitioned mode, and L1, L2 and Li are obtained by directly reading corresponding pulse spectrum values. For each sector a corresponding timer Ti is provided to calculate the running time, t, of the engine in that sector1、t2、tiI.e. the result of the calculation of the corresponding timer.
In the technical scheme, the catalyst efficiency window pulse spectrum matching module calculates the threshold value of the catalyst aging coefficient grading interval based on the engine speed and the load.
The threshold value of the classification interval is obtained by a catalytic converter durability test (classification is carried out according to different model requirements and durability test conditions) and is as follows: the emissions of the systems with the catalyst mounted on the engine, i.e. the emissions G of the emissions obtained by running the engine (with aftertreatment) through the corresponding emissions regulation cycle, were tested at 0 hours, 250 hours, 500 hours, 750 hours and 1000 hours of the durability test, respectively0、G250、G500、G750、G1000The initial threshold is 1, and the first threshold Y1 is calculated by the following formula:
Y1＝G250/G0
the second threshold value Y2 is calculated by the following formula:
Y2＝G500/G0
the thresholds Y3 and Y4 can be obtained by analogy from model to model and durability test.
In the 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 grading 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 at 0 hour, 250 hours, 500 hours, 750 hours and 1000 hours of the durability test of the catalytic converter, so as to obtain the pulse spectrum of the optimal efficiency window of the catalytic converter at the moment. The efficiency window pulse spectrum for 0 hours is defined as M1, the efficiency window for 250 hours is defined as M2, and so on.
In the technical scheme, the catalyst efficiency window pulse spectrum matching module judges the classification interval to which the aging coefficient value of the catalytic converter obtained by calculation belongs, and outputs the catalyst efficiency window pulse spectrum corresponding to the classification interval.
In particular, when the aging factor L of the catalytic converterαWhen the first pulse spectrum M is greater than or equal to 1 and smaller than a first threshold value L1, outputting a first pulse spectrum M1As catalyst efficiency window pulse spectrum Mx。
When aging coefficient L of the catalytic converterαWhen the first threshold value L1 is not less than the second threshold value L2, a second pulse spectrum M is output2As catalyst efficiency window pulse spectrum Mx。
When aging coefficient L of the catalytic converterαWhen the second threshold value L2 is not less than the third threshold value L3, a third pulse spectrum M is output3As catalyst efficiency window pulse spectrum Mx。
In the technical scheme, the air-fuel ratio control module calculates and outputs the air-fuel ratio of the gas engine based on the received catalyst efficiency window pulse spectrum, the target air-fuel ratio and the air-fuel ratio closed-loop correction coefficient.
Air-fuel ratio L of gas enginelamThe calculation formula of (a) is as follows:
in the above formula, LlamsRepresents the target air-fuel ratio, LlasoRepresents an air-fuel ratio correction value 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: the method comprises the following steps:
s1, exhaust temperature T based on gas engineexhExhaust gas flow rate GexhAnd establishing an aging model M of the catalytic converter of the gas engine according to the accumulated running time t of the corresponding working conditioncat(ii) a Aging model M of catalytic converter of gas enginecatAging pulse spectrum of the basic catalytic converter, the abscissa of which is the exhaust temperature TexhThe ordinate is the exhaust flow GexhThe pulse spectrum value represents the basic aging coefficient L0。
The engine is provided with an exhaust temperature sensor and an intake flow sensor, and the measured value of the exhaust temperature sensor is Texh. The exhaust flow rate is obtained by the following formula:
Gexh＝Gair+Gfuel
in the formula, GairIs an actual value of the intake air flow sensor, GfuelThe fuel consumption calculated for the gas injection system model.
S2, catalytic converter aging model M based on gas enginecatAnd calculating to obtain the aging coefficient L of the catalytic converterα；
The aging factor of the catalytic converter was calculated using the following formula:
in the formula: l1, L2 and Li represent corresponding working condition aging coefficients obtained based on a basic aging pulse spectrum of the catalytic converter; t is t1、t2、tiRepresenting the running time of the corresponding working condition; Σ t represents the total running time.
S3, matching a corresponding catalyst efficiency window pulse spectrum according to the grading interval corresponding to the aging coefficient of the catalyst;
specifically, when the aging coefficient L α of the catalytic converter is 1 or more and less than the first threshold value Y1, the first pulse spectrum M1 is output as the catalyst efficiency window pulse spectrum Mx.
When the aging coefficient L α of the catalytic converter is equal to or greater than the first threshold value Y1 and less than the second threshold value Y2, the second pulse spectrum M2 is output as the catalyst efficiency window pulse spectrum Mx.
When the aging coefficient L α of the catalytic converter is equal to or greater than the second threshold value Y2 and less than the third threshold value Y3, the third pulse spectrum M3 is output as the catalyst efficiency window pulse spectrum Mx.
And S4, calculating to obtain an air-fuel ratio output value of the gas engine based on the catalyst efficiency window pulse spectrum, the target air-fuel ratio and the air-fuel ratio closed-loop correction coefficient.
Air-fuel ratio L of gas enginelamThe calculation formula of (a) is as follows:
in the above formula, LlamsRepresents the target air-fuel ratio, LlasoRepresents an air-fuel ratio correction value based on the 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 has stored thereon a program of a catalyst aging model-based gas engine air-fuel ratio control method, which when executed by a vehicle controller implements the steps of the catalyst aging model-based gas engine air-fuel ratio control method of the above-described aspect.
Here, it should be noted that the description of the above technical solutions is exemplary, the present specification may be embodied in different forms, and should not be construed as being limited to the technical solutions set forth herein. Rather, these descriptions are 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 present invention is limited only by the scope of the claims.
The shapes, sizes, ratios, angles, and numbers disclosed to describe aspects of the specification and claims are examples only, and thus, the specification and claims are not limited to the details shown. In the following description, when a detailed description of related known functions or configurations is determined to unnecessarily obscure the focus of the present specification and claims, the detailed description will be omitted.
Where the terms "comprising", "having" and "including" are used in this specification, there may be another part or parts unless otherwise stated, and the terms used may generally be in the singular but may also be in the plural.
It should be noted that although the terms "first," "second," "top," "bottom," "side," "other," "end," "other end," and the like may be used and used in this specification to describe various components, these components and parts should not be limited by these terms. These terms are only used to distinguish one element or section from another element or section. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, with the top and bottom elements being interchangeable or switchable with one another, where appropriate, without departing from the scope of the present description; the components at one end and the other end may be of the same or different properties to each other.
Further, in constituting the component, although it is 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 being "on.. above", "over.. below", "below", and "next", unless such words or terms are used as "exactly" or "directly", they may include cases where there is no contact or contact therebetween. If a first element is referred to as being "on" a second element, that does not mean that the first element must be above the second element in the figures. The upper and lower portions of the member will change depending on the angle of view and the change in orientation. Thus, in the drawings or in actual construction, if a first element is referred to as being "on" a second element, it can be said that the first element is "under" the second element and the first element is "over" the second element. In describing temporal relationships, unless "exactly" or "directly" is used, the description of "after", "subsequently", and "before" may include instances where there is no discontinuity between steps. The features of the various embodiments of the present invention may be partially or fully combined or spliced with each other and performed in a variety of different configurations as would 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
As will be appreciated by one skilled in the art, 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 flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams 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 noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting the protection scope thereof, and although the present invention has been described in detail with reference to the above-mentioned embodiments, those skilled in the art should understand that after reading the present invention, they can make various changes, modifications or equivalents to the specific embodiments of the present invention, but these changes, modifications or equivalents are within the protection scope of the appended claims.
Those not described in detail in this specification are within the skill of the art.
Claims (10)
1. The utility model provides a gas engine air-fuel ratio control system based on catalyst converter model that ages which 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 ends of the target air-fuel ratio output module, the catalyst efficiency window control module and the air-fuel ratio closed-loop correction module are electrically connected with the input end of the air-fuel ratio control module; the target air-fuel ratio module outputs the 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; and the air-fuel ratio control module calculates and outputs the air-fuel ratio of the gas engine based on the received catalyst efficiency window pulse spectrum, the target air-fuel ratio and the air-fuel ratio closed-loop correction coefficient.
2. The gas engine air-fuel ratio control system based on the catalyst aging model according to claim 1, characterized in that: 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 gas engine catalytic converter aging model generating module establishes a gas engine catalytic converter aging model based on the running state information of the gas engine, and the aging coefficient calculating module of the catalytic converter calculates the aging coefficient of the catalytic converter based on the gas engine catalytic converter aging model; and the catalyst efficiency window pulse spectrum matching module matches and outputs the corresponding catalyst efficiency window pulse spectrum based on the aging coefficient of the catalytic converter obtained by calculation.
3. The gas engine air-fuel ratio control system based on the catalyst aging model according to claim 1, characterized in that: the gas engine catalytic converter aging model generating module is used for establishing a gas engine catalytic converter aging model based on the exhaust temperature, the exhaust flow and the operation time of the gas engine; the aging model of the gas engine catalytic converter is a basic aging pulse spectrum of the catalytic converter, the abscissa of the aging model is exhaust temperature, the ordinate of the aging model is exhaust flow, and a pulse spectrum value represents a basic aging coefficient.
4. A gas engine air-fuel ratio control system based on a catalyst aging model according to claim 3, characterized in that: the aging coefficient calculation module of the catalytic converter calculates the aging coefficient of the catalytic converter by adopting the following formula:
in the formula: l1, L2 and Li represent corresponding working condition aging coefficients obtained based on a basic aging pulse spectrum of the catalytic converter; t is t1、t2、tiRepresenting the running time of the corresponding working condition; Σ t represents the total running time.
5. The gas engine air-fuel ratio control system based on the catalyst aging model according to claim 4, characterized in that: and the catalyst efficiency window pulse spectrum matching module calculates the threshold value of the catalyst aging coefficient grading interval based on the engine speed and the load.
6. The gas engine air-fuel ratio control system based on the catalyst aging model according to claim 5, characterized in that: the catalyst efficiency window pulse spectrum matching module sets a catalyst efficiency window pulse spectrum matched with each interval based on the catalyst aging coefficient grading intervals.
7. The gas engine air-fuel ratio control system based on the catalyst aging model according to claim 6, characterized in that: and the catalyst efficiency window pulse spectrum matching module judges the classification interval to which the aging coefficient value of the catalytic converter obtained by calculation belongs, and outputs the catalyst efficiency window pulse spectrum corresponding to the classification interval.
8. The gas engine air-fuel ratio control system based on the catalyst aging model according to claim 4, characterized in that: and the air-fuel ratio control module calculates and outputs the air-fuel ratio of the gas engine based on the received catalyst efficiency window pulse spectrum, the target air-fuel ratio and the air-fuel ratio closed-loop correction coefficient.
9. A gas engine air-fuel ratio control method based on a catalyst aging model is characterized in that: the method comprises the following steps:
establishing an aging model of the catalytic converter of the gas engine based on the exhaust temperature and the exhaust flow of the gas engine and the accumulated running time of corresponding working conditions;
calculating an aging coefficient of the catalytic converter based on an aging model of the catalytic converter of the gas engine;
matching a corresponding catalyst efficiency window pulse spectrum according to a grading interval corresponding to the aging coefficient of the catalyst;
and calculating to obtain an air-fuel ratio output value of the gas engine based on the catalyst efficiency window pulse spectrum, the target air-fuel ratio and the air-fuel ratio closed-loop correction coefficient.
10. A computer-readable storage medium characterized by: the computer readable storage medium has stored thereon a program of a catalyst aging model-based gas engine air-fuel ratio control method, which when executed by a vehicle controller implements the steps of the catalyst aging model-based gas engine air-fuel ratio control method of the above-described aspect.
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