CN113550835B - Pollutant emission control method, system, storage medium, driving computer and vehicle - Google Patents
Pollutant emission control method, system, storage medium, driving computer and vehicle Download PDFInfo
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- CN113550835B CN113550835B CN202010333646.7A CN202010333646A CN113550835B CN 113550835 B CN113550835 B CN 113550835B CN 202010333646 A CN202010333646 A CN 202010333646A CN 113550835 B CN113550835 B CN 113550835B
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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
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
- F02D41/1402—Adaptive control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N9/00—Electrical control of exhaust gas treating apparatus
- F01N9/005—Electrical control of exhaust gas treating apparatus using models instead of sensors to determine operating characteristics of exhaust systems, e.g. calculating catalyst temperature instead of measuring it directly
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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
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/0077—Control of the EGR valve or actuator, e.g. duty cycle, closed loop control of position
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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
- F02D41/1445—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 related to the exhaust flow
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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
- F02D41/146—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 NOx content or concentration
- F02D41/1461—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 NOx content or concentration of the exhaust gases emitted by the engine
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
- F01N2610/146—Control thereof, e.g. control of injectors or injection valves
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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
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
- F02D2041/1433—Introducing closed-loop corrections characterised by the control or regulation method using a model or simulation of the system
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention provides a pollutant emission control method, a pollutant emission control system, a storage medium, a driving computer and a vehicle, wherein the pollutant emission control method comprises the following steps: acquiring fuel injection parameters, air inlet system parameters and engine operation condition parameters of an engine when a vehicle is running; judging whether the operation working condition of the engine meets the preset working condition or not; when the operation working condition of the engine is judged to meet the preset working condition, determining the theoretical emission of pollutants of the vehicle; acquiring an actual emission amount of pollutants of the vehicle; adjusting a pollutant calculation model of the vehicle so that the adjusted pollutant calculation model meets preset conditions; and under the specified condition, utilizing the adjusted pollutant calculation model to realize closed-loop control on pollutant emission. According to the embodiment, the accurate control of the pollutant emission amount in the whole time period can be realized, the individual difference of the engines is considered, each engine is provided with the pollutant calculation model which is suitable for the engine, and the accurate control of the pollutant emission amount is ensured.
Description
Technical Field
The invention relates to the technical field of pollutant emission monitoring, in particular to a pollutant emission control method and system, a storage medium, a driving computer and a vehicle.
Background
With the development of social economy, the importance of environmental protection is increasing, and the eastern 11 provinces of 4 th year in 2016 have implemented national five emission standards for special vehicles (buses, sanitation and postal service). The national 5-stage engine emission standard has also been implemented for heavy-duty diesel vehicles in 2017, 7, 1. According to different requirements of different regions, the Guohui products are also logged into the market successively.
More serious tests are currently actively carried out On-board automatic diagnostic (On-board) monitoring of On-board emissions (OBD) of heavy diesel vehicles, which is a way of On-board emissions detection during actual road driving, in real time, and emissions quality and fuel consumption regulations.
The current heavy diesel engine technology adopts post-treatment technologies such as DOC (Diesel Oxidation Catalyst ), POC (Particle Oxidation Catalyst, particulate matter catalytic oxidizer) and DPF (Diesel Particulate Filter, particulate matter trap) to reduce emission of PM (Particulate Matter ), and adopts post-treatment devices such as EGR (Exhaust Gas Recirculation ), SCR (Selective Catalytic Reduction, selective catalytic reduction) to reduce emission of NOx (nitrogen oxides). In order to accurately control the emission of nitrogen oxides, almost all national six control systems adopt a control mode of a double nitrogen oxide sensor closed loop. However, the operation of the nox sensor requires a certain condition, and when the engine is started in a period of time, the operation condition of nox cannot be satisfied, that is, closed-loop control of nox cannot be achieved, and the general solution is to adopt an open-loop control mode of nox model. The nitrogen oxide model is often affected by the dispersion of engine parts, so that the urea injection demand and the nitrogen oxide emission are not matched enough, and vehicle emission measurement and OBD diagnosis are affected.
Disclosure of Invention
The invention mainly aims to provide a pollutant emission control method, a pollutant emission control system, a storage medium, a driving computer and a driving vehicle, so as to realize accurate control of pollutant emission when the actual pollutant emission cannot be measured.
In a first aspect, embodiments of the present application provide a vehicle pollutant emission control method comprising the steps of: acquiring fuel injection parameters, air inlet system parameters and engine operation condition parameters of an engine when a vehicle is running; judging whether the operation condition of the engine meets the preset condition according to the operation condition parameters of the engine; when the operation condition of the engine is judged to meet the preset operation condition, determining the theoretical emission of pollutants of the vehicle by using a pollutant calculation model according to the fuel injection parameter, the air inlet system parameter and the engine operation condition parameter of the engine; acquiring an actual emission amount of pollutants of the vehicle; comparing and analyzing the theoretical emission amount and the actual emission amount of the pollutants of the vehicle, and adjusting a pollutant calculation model of the vehicle according to an analysis result so that the adjusted pollutant calculation model meets preset conditions; and under the specified condition, utilizing the adjusted pollutant calculation model to realize closed-loop control on pollutant emission.
Optionally, determining whether the operation condition of the engine meets the preset operation condition according to the operation condition parameter of the engine includes: comparing the accumulated cyclic work of the engine with a preset cyclic work threshold, and determining the operation time duty ratio of the engine under each preset operation condition in the working time range of the engine corresponding to the accumulated cyclic work when the accumulated cyclic work of the engine is larger than or equal to the preset cyclic work threshold, wherein the operation time duty ratio is the proportion of the operation time of the engine under each preset operation condition to the working time range of the engine corresponding to the accumulated cyclic work; and when the operating time duty ratio of the engine under each preset operating condition is greater than or equal to the corresponding preset proportion threshold value, judging that the operating condition of the engine meets the preset operating condition.
Optionally, the preset condition includes: the sum of the absolute values of the differences between the corrected theoretical emissions and the actual emissions for each of the pollutants of the vehicle is minimized.
Optionally, under the specified condition, implementing closed-loop control of pollutant emission by using the adjusted pollutant calculation model, including: when the sensor for detecting the pollutant cannot measure the actual emission amount of the pollutant of the vehicle, the regulated pollutant calculation model is utilized to realize closed-loop control of the pollutant emission.
Optionally, under the specified condition, implementing closed-loop control of pollutant emission by using the adjusted pollutant calculation model, including: when the engine is cold started and the sensor for detecting pollutants cannot measure the actual emission amount of the pollutants of the vehicle, the adjusted pollutant calculation model is utilized to realize closed-loop control of the pollutant emission.
Optionally, the contaminant includes nitrogen oxides.
In a second aspect, embodiments of the present application provide a vehicle pollutant emission control system comprising: the parameter acquisition module is used for acquiring fuel injection parameters, air inlet system parameters and engine operation condition parameters of the engine when the vehicle is running; the working condition judging module is used for judging whether the operation working condition of the engine meets the preset working condition according to the engine operation working condition parameters; the displacement calculation module is used for determining the theoretical discharge amount of pollutants of the vehicle by utilizing the pollutant calculation model according to the fuel injection parameter, the air inlet system parameter and the engine operation condition parameter of the engine when the operation condition of the engine is judged to meet the preset operation condition; the displacement detection module is used for acquiring the actual discharge amount of pollutants of the vehicle; the model adjustment module is used for comparing and analyzing the theoretical emission amount and the actual emission amount of the pollutants of the vehicle, and adjusting the pollutant calculation model of the vehicle according to the analysis result so that the adjusted pollutant calculation model meets the preset condition; and the displacement control module is used for realizing closed-loop control on pollutant emission by using the adjusted pollutant calculation model under the specified condition.
In a third aspect, embodiments of the present application provide a driving computer comprising a controller and a memory, wherein the memory stores computer program code that, when executed by the controller, implements a vehicle pollutant emission control method as described above.
In a fourth aspect, embodiments of the present application provide a vehicle comprising: a pollutant sensor for detecting an actual discharge amount of pollutants; the engine sensor is used for acquiring fuel injection parameters, air inlet system parameters and engine operation condition parameters of the engine; a cycle computer as described above.
In a fifth aspect, embodiments of the present application provide a storage medium storing program code which, when executed by a processor, implements the steps of a vehicle pollutant emission control method as described above.
According to the vehicle pollutant emission control method, the pollutant emission amount calculation model is adjusted through the comparison analysis of the measured value and the calculated value of the pollutant emission amount, so that the calculation accuracy of the pollutant emission amount calculation model is improved. The calculation model is loaded into a driving computer and used for calculating the subsequent pollutant discharge amount, and when the pollutant sensor cannot work, the model is used for controlling the open-loop pollutant discharge amount, so that the accurate control of the pollutant discharge amount in the whole period can be realized.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a undue limitation on the invention, wherein:
FIG. 1 is a flowchart of a vehicle pollutant emission control method according to an exemplary embodiment of the present application;
FIG. 2 is a schematic diagram illustrating the installation of vehicle exhaust emission relevant components according to one embodiment of the present application;
FIG. 3 is a schematic illustration of the operating principle of a vehicle pollutant emission control method according to one embodiment of the present application;
FIG. 4 is a schematic structural view of a vehicle pollutant emission control system according to an exemplary embodiment of the present application;
in FIG. 2, 1-intake throttle (Intake Air Throttle, IAT for short), 2-exhaust throttle (Exhaust Throttle Valve, ETV for short), 3-intake manifold, 4-engine, 5-intake manifold temperature sensor, 6-intake manifold pressure sensor, 7-exhaust manifold, 8-drive computer (Electronic Control Unit, ECU, electronic control unit, also called drive computer), 9-aftertreatment system (including DOC, DPF, SCR and ASC), 10-aftertreatment inlet NOx sensor, 11-aftertreatment inlet temperature sensor, 12-tailpipe NOx sensor.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
Because of the dispersion difference of all parts of the engine, the precision of an initial pollutant calculation model in a driving computer cannot be matched with all the engines, and therefore, when the pollutant calculation model is required to be adopted for open-loop control, the accurate control of pollutants cannot be realized.
In order to reduce the influence of individual differences of an engine on the precision of a pollutant calculation model, according to the technical scheme of the invention, in a determined circulation range, the pollutant emission amount obtained by measuring a pollutant sensor at the outlet of an exhaust tail pipe collected by a driving computer and the pollutant emission amount obtained by calculating the pollutant calculation model are corrected and updated through comparative analysis, and the updated pollutant calculation model is loaded into the driving computer. Thus, each engine is provided with a pollutant calculation model which is adaptive to the engine, and the control of pollutant emission is positively influenced.
Example 1
FIG. 1 is a flowchart of a vehicle pollutant emission control method according to an exemplary embodiment of the present application. As shown in fig. 1, an embodiment of the present application provides a vehicle pollutant emission control method, which is characterized by comprising the steps of:
s110: the method comprises the steps of obtaining fuel injection parameters, air inlet system parameters and engine operation condition parameters of an engine when a vehicle is operated.
Fig. 2 is a schematic installation view of vehicle exhaust emission related components according to an embodiment of the present application. Taking the pollutant as the nitrogen oxide for example, when the vehicle runs, the engine sensor feeds back parameters required by the pollutant calculation model for calculating the pollutant emission amount to the driving computer, wherein the parameters required by the pollutant calculation model comprise the fuel injection parameters of the engine, the air inlet system parameters and the engine running condition parameters.
S120: and judging whether the operation condition of the engine meets the preset condition according to the operation condition parameters of the engine.
As an optional implementation manner, determining whether the operation condition of the engine meets the preset operation condition according to the operation condition parameter of the engine includes: comparing the accumulated cyclic work of the engine with a preset cyclic work threshold, and determining the operation time duty ratio of the engine under each preset operation condition in the working time range of the engine corresponding to the accumulated cyclic work when the accumulated cyclic work of the engine is larger than or equal to the preset cyclic work threshold, wherein the operation time duty ratio is the proportion of the operation time of the engine under each preset operation condition to the working time range of the engine corresponding to the accumulated cyclic work; and when the operating time duty ratio of the engine under each preset operating condition is greater than or equal to the corresponding preset proportion threshold value, judging that the operating condition of the engine meets the preset operating condition.
The preset circulating power threshold value can be set according to the specific condition of the engine, for example, the preset circulating power threshold value of the newly-manufactured engine can be set to be a larger value, because the abrasion degree of each part of the newly-manufactured engine is more consistent, the pollutant calculation model in the driving computer can relatively accurately calculate the emission amount of vehicle pollutants, and therefore the pollutant calculation model can be adjusted after the engine is used for a longer time; in the middle or later period of engine use, the preset cycle work threshold value can be set to a smaller value, because the difference of the wear degrees of all parts of the engine is gradually increased in the middle or later period, so that the pollutant calculation model in the driving computer is difficult to match with the engine under the current situation, and therefore the pollutant calculation model needs to be adjusted in time, so that the pollutant calculation model outputs a more accurate pollutant emission value.
The preset operating condition may be, for example, an operating condition in an urban area, an operating condition in a suburban area, or the like. Under different working conditions, the running speeds of the vehicles are different, so that the running conditions of the engines are also different.
The preset working condition may be, for example, a working condition that the engine needs to meet when it is determined that the pollutant calculation model needs to be adjusted. That is, when the engine meets a preset operating condition, an adjustment of the pollutant calculation model is triggered.
As a specific example, the preset cycle work threshold may be set to 1000J, and after 500 hours of engine operation, the cumulative cycle work reaches 1000J. In the 500 hours, 300 hours are in urban operation, and 200 hours are in suburban operation, so that the running time of the vehicle in urban operation accounts for 60 percent (greater than 50 percent of the preset proportion threshold corresponding to the working condition of the urban operation) of 500 hours, and the running time of the vehicle in suburban operation accounts for 40 percent (greater than 30 percent of the preset proportion threshold corresponding to the working condition of suburban operation), and therefore, the running condition of the engine is judged to meet the preset working condition.
S130: when the operation condition of the engine is judged to meet the preset operation condition, determining the theoretical emission of pollutants of the vehicle by using a pollutant calculation model according to the fuel injection parameter of the engine, the air inlet system parameter and the operation condition parameter of the engine.
The pollutants may include nitrogen oxides, carbon monoxide, hydrocarbons, sulfides, inhalable particulates, and the like, which are not limited herein, and the technical solution of the present application is illustrated by taking nitrogen oxides as an example.
S140: an actual emission of pollutants from the vehicle is obtained.
The actual emission of pollutants may be measured using a pollutant sensor, for example, the actual emission of nitrogen oxides in the exhaust gas may be measured using a nitrogen oxide sensor, and the actual emission of oxygen in the exhaust gas may be measured using an oxygen sensor.
S150: comparing and analyzing the theoretical emission amount and the actual emission amount of the pollutants of the vehicle, and adjusting a pollutant calculation model of the vehicle according to an analysis result so that the adjusted pollutant calculation model meets preset conditions;
as an alternative embodiment, the preset condition includes: the sum of the absolute values of the differences between the corrected theoretical emissions and the actual emissions for each of the pollutants of the vehicle is minimized.
As a specific example, the corrected theoretical emission of each pollutant of the vehicle is calculated according to the fuel injection parameter of the engine, the air intake system parameter and the engine operation condition parameter by using the adjusted pollutant calculation model, and the absolute value of the difference between the corrected theoretical emission of each pollutant of the vehicle and the actual emission is summed. And for each adjusted pollutant calculation model, when the sum value is minimum, determining that the pollutant calculation model after the adjustment meets the preset condition.
Taking nitrogen oxides as an example, the nitrogen oxides discharged from the exhaust gas of the vehicle may include nitrogen monoxide, nitrogen dioxide and oxygen, wherein the emission amount of the nitrogen monoxide is 10 units, the emission amount of the nitrogen dioxide is 20 units, and the emission amount of the oxygen is 10 units. After the nitrogen oxide calculation model is adjusted for the first time, the nitrogen oxide calculation model calculates 8 units of nitric oxide, 16 units of nitrogen dioxide and 7 units of oxygen in pollutants discharged by the vehicle; after the nitrogen oxide calculation model is adjusted for the second time, the nitrogen oxide calculation model calculates 9 units of nitric oxide, 18 units of nitrogen dioxide and 9 units of oxygen in pollutants discharged by the vehicle; after the third adjustment is performed on the nitrogen oxide calculation model, the nitrogen oxide calculation model calculates 10 units of nitrogen monoxide, 19 units of nitrogen dioxide and 8 units of oxygen in pollutants discharged by the vehicle. The sum of the absolute values of the differences of the corrected theoretical emissions and the actual emissions for each of the pollutants of the vehicle for the first adjustment is: 2+4+3=9, the second time 1+2+1=4, the third time: 0+1+2=3. It can be seen that after the third adjustment, the sum of the absolute values of the differences of the corrected theoretical emissions and the actual emissions for each of the pollutants of the vehicle is minimal, and therefore, the nitrogen oxide calculation model after the third adjustment is loaded into the driving computer of the vehicle.
As an alternative embodiment, the initial model of the pollutant calculation model may be used as the pollutant calculation model of the vehicle, and the pollutant calculation model meeting the preset condition may be quickly obtained by adjusting the initial model.
Fig. 3 is a schematic diagram of the operating principle of a vehicle pollutant emission control method according to an embodiment of the present application. As shown in fig. 3, the adaptive nox calculation module takes the initial nox calculation module as a feed-forward input, and adjusts the adaptive nox calculation module by comparing and analyzing the calculated output value of the nox of the adaptive nox calculation module with the measured value of the nox sensor, and the adaptive nox calculation module participates in the closed-loop control of the nox emission of the vehicle after the adjustment is completed.
S160: and under the specified condition, utilizing the adjusted pollutant calculation model to realize closed-loop control on pollutant emission.
As an alternative embodiment, the closed-loop control of the pollutant emission is achieved under specified conditions using the adjusted pollutant calculation model, comprising: when the sensor for detecting the pollutant cannot measure the actual emission amount of the pollutant of the vehicle, the regulated pollutant calculation model is utilized to realize closed-loop control of the pollutant emission.
For example, when the sensor is damaged, the calculated output value of the adjusted pollutant calculation model can be directly utilized to participate in closed-loop control of pollutant emission.
As an alternative embodiment, the closed-loop control of the pollutant emission is achieved under specified conditions using the adjusted pollutant calculation model, comprising: when the engine is cold started and the sensor for detecting pollutants cannot measure the actual emission amount of the pollutants of the vehicle, the adjusted pollutant calculation model is utilized to realize closed-loop control of the pollutant emission.
In the technical scheme of the invention, the pollutant emission amount calculation model is adjusted by comparing and analyzing the measured value and the calculated value of the pollutant emission amount, so that the calculation accuracy of the pollutant emission amount calculation model is improved. The calculation model is loaded into a driving computer and used for calculating the subsequent pollutant discharge amount, and when the pollutant sensor cannot work, the model is used for carrying out open-loop control on pollutant discharge, so that the accurate control on the pollutant discharge amount in the whole period can be realized.
With the increase of the driving mileage of the vehicle, the engine performance can change to a certain extent, so the invention can realize the self-adaptive update of the pollutant calculation model in the whole life cycle of the engine, namely, the driving computer can activate the self-adaptive adjustment of the pollutant calculation model when the running condition of the engine meets the self-adaptive adjustment requirement, the self-adaptive adjustment of the pollutant calculation model is carried out according to the current state of the engine, the accurate control of the running condition of the pollutant in the whole time period is realized in the emission quality guarantee period of the engine even in the whole life cycle, and the requirement of emission regulations is met.
Because the model considers the individual differences of the engines, the influence of the differences of individual parts of the engines on the pollutant calculation model can be effectively reduced, and the self-adaptive pollutant calculation model can be calibrated aiming at the engines with different application types, so that each engine has the pollutant calculation model which is adaptive to the engine, the influence of the individual differences of the engines on the pollutant emission is reduced, and the accurate control of the pollutant emission is ensured.
According to the vehicle pollutant emission control method, pollutant emission In the tail pipe can be effectively reduced, the emission control of nitrogen oxides In the initial stage of vehicle-mounted emission is favorably met, and the emission level of the engine In the whole operation period meets the requirements of national (European) six, OBD (on-demand) and IUPR (In-Use Performance Ratio) and vehicle-mounted emission regulations of the whole vehicle.
Example two
FIG. 4 is a schematic structural diagram of a vehicle pollutant emission control system according to an exemplary embodiment of the present application. As shown in fig. 4, embodiments of the present application provide a vehicle pollutant emission control system 200 comprising: the parameter obtaining module 210 is configured to obtain a fuel injection parameter, an intake system parameter, and an engine operation condition parameter of the engine when the vehicle is running; the working condition judging module 220 is configured to judge whether the operation working condition of the engine meets a preset working condition according to the engine operation working condition parameter; the displacement calculation module 230 is configured to determine, when it is determined that the operation condition of the engine meets the preset operation condition, a theoretical emission amount of pollutants of the vehicle according to the fuel injection parameter, the air intake system parameter, and the engine operation condition parameter of the engine, using a pollutant calculation model; a displacement detection module 240 for obtaining an actual amount of emissions of pollutants for the vehicle; the model adjustment module 250 is configured to perform a comparative analysis on a theoretical emission amount and an actual emission amount of the pollutant of the vehicle, and adjust a pollutant calculation model of the vehicle according to an analysis result, so that the adjusted pollutant calculation model meets a preset condition; the displacement control module 260 is configured to implement closed-loop control of pollutant emission using the adjusted pollutant calculation model under specified conditions.
Example III
Embodiments of the present application provide a driving computer comprising a controller and a memory, the memory having stored therein computer program code which, when executed by the controller, implements a vehicle pollutant emission control method as described above.
Example IV
Embodiments of the present application provide a vehicle including: a pollutant sensor for detecting an actual discharge amount of pollutants; the engine sensor is used for acquiring fuel injection parameters, air inlet system parameters and engine operation condition parameters of the engine; a cycle computer as described above. Fig. 2 is a schematic installation view of vehicle exhaust emission related components according to an embodiment of the present application. As a specific embodiment of the application, taking a pollutant as a nitrogen oxide as an example, as shown in fig. 2, the post-treatment inlet nitrogen oxide sensor 10 is used for detecting an actual emission amount of the nitrogen oxide, the driving computer 8 collects various parameters required by the nitrogen oxide model according to information fed back by an engine sensor (not shown in the figure), including a fuel injection parameter, an air intake system parameter and an engine operation condition parameter, when the engine operation condition meets a preset operation condition, the nitrogen oxide calculation model is adjusted to meet the preset condition according to the method described in the first embodiment, and the adjusted nitrogen oxide calculation model is loaded into the driving computer 8 to participate in closed-loop control of the nitrogen oxide emission amount of the vehicle.
Example five
Embodiments of the present application provide a storage medium storing program code which, when executed by a processor, implements the steps of a vehicle pollutant emission control method as described above.
It is noted that the terms used herein are used merely to describe particular embodiments and are not intended to limit exemplary embodiments in accordance with the present application and when the terms "comprises" and/or "comprising" are used in this specification they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
It should be understood that the exemplary embodiments in this specification may be embodied in many different forms and should not be construed as limited to only the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of these exemplary embodiments to those skilled in the art, and should not be construed as limiting the invention.
Claims (10)
1. A vehicle pollutant emission control method, comprising the steps of:
acquiring fuel injection parameters, air inlet system parameters and engine operation condition parameters of an engine when a vehicle is running;
judging whether the operation condition of the engine meets the preset condition according to the operation condition parameters of the engine; specifically, comparing the accumulated cycle work of the engine with a preset cycle work threshold, and determining the operation time duty ratio of the engine under each preset operation condition within the operation time range of the engine corresponding to the accumulated cycle work when the accumulated cycle work of the engine is greater than or equal to the preset cycle work threshold; when the operating time duty ratio of the engine under each preset operating condition is greater than or equal to the corresponding preset proportion threshold value, judging that the operating condition of the engine meets the preset operating condition;
when the operation condition of the engine is judged to meet the preset operation condition, determining the theoretical emission of pollutants of the vehicle by using a pollutant calculation model according to the fuel injection parameter, the air inlet system parameter and the engine operation condition parameter of the engine;
acquiring an actual emission amount of pollutants of the vehicle;
comparing and analyzing the theoretical emission amount and the actual emission amount of the pollutants of the vehicle, and adjusting a pollutant calculation model of the vehicle according to an analysis result so that the adjusted pollutant calculation model meets preset conditions;
and under the specified condition, utilizing the adjusted pollutant calculation model to realize closed-loop control on pollutant emission.
2. The vehicle pollutant emission control method of claim 1, wherein the operating time ratio is a ratio of an operating time of the engine under each preset operating condition to a working time range of the engine corresponding to the accumulated cyclic work.
3. The vehicle pollutant emission control method according to claim 1, characterized in that the preset conditions include:
the sum of the absolute values of the differences between the corrected theoretical emissions and the actual emissions for each of the pollutants of the vehicle is minimized.
4. The vehicle pollutant emission control method of claim 1, wherein the closed-loop control of pollutant emission using the adjusted pollutant calculation model is achieved under specified conditions, comprising:
when the sensor for detecting the pollutant cannot measure the actual emission amount of the pollutant of the vehicle, the regulated pollutant calculation model is utilized to realize closed-loop control of the pollutant emission.
5. The vehicle pollutant emission control method of claim 1, wherein the closed-loop control of pollutant emission using the adjusted pollutant calculation model is achieved under specified conditions, comprising:
when the engine is cold started and the sensor for detecting pollutants cannot measure the actual emission amount of the pollutants of the vehicle, the adjusted pollutant calculation model is utilized to realize closed-loop control of the pollutant emission.
6. The vehicle pollutant emission control method of any one of claims 1 to 5, wherein the pollutant comprises nitrogen oxides.
7. A vehicle pollutant emission control system, comprising:
the parameter acquisition module is used for acquiring fuel injection parameters, air inlet system parameters and engine operation condition parameters of the engine when the vehicle is running;
the working condition judging module is used for judging whether the operation working condition of the engine meets the preset working condition according to the engine operation working condition parameters;
the displacement calculation module is used for determining the theoretical discharge amount of pollutants of the vehicle by utilizing the pollutant calculation model according to the fuel injection parameter, the air inlet system parameter and the engine operation condition parameter of the engine when the operation condition of the engine is judged to meet the preset operation condition;
the displacement detection module is used for acquiring the actual discharge amount of pollutants of the vehicle;
the model adjustment module is used for comparing and analyzing the theoretical emission amount and the actual emission amount of the pollutants of the vehicle, and adjusting the pollutant calculation model of the vehicle according to the analysis result so that the adjusted pollutant calculation model meets the preset condition;
and the displacement control module is used for realizing closed-loop control on pollutant emission by using the adjusted pollutant calculation model under the specified condition.
8. A driving computer comprising a controller and a memory, wherein the memory has stored therein computer program code which, when executed by the controller, implements the vehicle pollutant emission control method of any one of claims 1 to 6.
9. A vehicle, characterized by comprising:
a pollutant sensor for detecting an actual discharge amount of pollutants;
the engine sensor is used for acquiring fuel injection parameters, air inlet system parameters and engine operation condition parameters of the engine;
the cycle computer of claim 8.
10. A storage medium storing program code which, when executed by a processor, performs the steps of the vehicle pollutant emission control method of any one of claims 1 to 6.
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