CN113550835A - Pollutant emission control method and system, storage medium, driving computer and vehicle - Google Patents
Pollutant emission control method and system, storage medium, driving computer and vehicle Download PDFInfo
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- CN113550835A CN113550835A CN202010333646.7A CN202010333646A CN113550835A CN 113550835 A CN113550835 A CN 113550835A CN 202010333646 A CN202010333646 A CN 202010333646A CN 113550835 A CN113550835 A CN 113550835A
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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
Abstract
The invention provides a pollutant emission control method, a pollutant emission control system, a storage medium, a running computer and a vehicle, wherein the method comprises the following steps: acquiring fuel injection parameters, air intake system parameters and engine operation condition parameters of an engine when a vehicle runs; judging whether the operating condition of the engine meets a preset operating condition or not; when the operating condition of the engine is judged to meet the preset operating condition, determining the theoretical emission of pollutants of the vehicle; acquiring the actual emission of pollutants of the vehicle; adjusting the pollutant calculation model of the vehicle to enable the adjusted pollutant calculation model to meet preset conditions; and under the specified condition, closed-loop control on pollutant emission is realized by utilizing the adjusted pollutant calculation model. According to the embodiment, the accurate control of the pollutant discharge amount in the whole period can be realized, the individual difference of the engines is considered, so that each engine has a pollutant calculation model adaptive to the engine, and the accurate control of the pollutant discharge amount is guaranteed.
Description
Technical Field
The invention relates to the technical field of pollutant emission monitoring, in particular to a pollutant emission control method, a pollutant emission control system, a storage medium, a traveling computer and a vehicle.
Background
With the development of social economy, the environmental protection is more and more emphasized, and 11 provinces in eastern 4 months in 2016 have implemented national emission standards for special vehicles (public transport, environmental sanitation and postal service). The 5-stage engine emission standards have also been implemented nationwide for heavy-duty diesel vehicles on 7.1.2017. According to different requirements of different regions, the products of the six countries are also continuously logged in the market.
A more severe test is that OBD (On-board diagnostics, vehicle-mounted automatic diagnostic system) real-time monitoring, emission quality protection and fuel consumption regulations aiming at vehicle-mounted emissions of heavy-duty diesel vehicles (a mode for vehicle-mounted emission detection of heavy-duty diesel vehicles in the actual road driving process) are actively carried out at present, and under the challenge of dual emission requirements and economic requirements, manufacturers must provide more environment-friendly engines.
In the present phase of heavy Diesel engine technology, aftertreatment technologies such as DOC (Diesel Oxidation Catalyst), POC (Particulate Oxidation Catalyst), DPF (Particulate Matter Filter) and the like are mostly used to reduce the emission of PM (Particulate Matter), and aftertreatment devices such as EGR (Exhaust Gas Recirculation), SCR (Selective Catalytic Reduction) and the like are mostly used to reduce the emission of NOx (nitrogen oxide). In order to accurately control the emission of nitrogen oxides, almost all the six control systems adopt a double-nitrogen-oxide-sensor closed-loop control mode. However, a certain condition is required for the operation of the nox sensor, and when the engine is started in a cold state for a certain period of time, the operating condition of the nox cannot be satisfied, that is, closed-loop control of the nox cannot be realized. The nitrogen oxide model is often influenced by the dispersion of engine parts, so that the urea injection demand and the nitrogen oxide emission are not matched sufficiently, and vehicle-mounted emission measurement and OBD diagnosis are influenced.
Disclosure of Invention
The invention mainly aims to provide a pollutant discharge control method, a system, a storage medium, a driving computer and a vehicle, so as to realize accurate control of pollutant discharge when actual pollutant discharge 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 intake system parameters and engine operation condition parameters of an engine when a vehicle runs; judging whether the operating condition of the engine meets a preset operating condition or not according to the operating condition parameters of the engine; when the operating condition of the engine is judged to meet the preset operating condition, determining the theoretical emission of pollutants of the vehicle by using a pollutant calculation model according to the fuel injection parameter, the air intake system parameter and the operating condition parameter of the engine; acquiring the actual emission of pollutants of the vehicle; comparing and analyzing the theoretical emission and the actual emission of 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 a preset condition; and under the specified condition, closed-loop control on pollutant emission is realized by utilizing the adjusted pollutant calculation model.
Optionally, whether the operating condition of the engine meets the preset operating condition is judged according to the operating condition parameters of the engine, including: comparing the accumulated cycle power of the engine with a preset cycle power threshold, and when the accumulated cycle power of the engine is greater than or equal to the preset cycle power threshold, determining the operating time duty ratio of the engine under each preset operating condition within the working time range of the engine corresponding to the accumulated cycle power, wherein the operating time duty ratio is the ratio of the operating time of the engine under each preset operating condition to the working time range of the engine corresponding to the accumulated cycle power; and when the operating time ratio of the engine under each preset operating condition is greater than or equal to the corresponding preset ratio threshold, judging that the operating condition of the engine meets the preset operating condition.
Optionally, the preset conditions include: the sum of the absolute values of the differences between the corrected theoretical emissions and the actual emissions for each pollutant of the vehicle is minimal.
Optionally, under a specific condition, the closed-loop control of pollutant emission is implemented by using the adjusted pollutant calculation model, and the closed-loop control includes: and when the sensor for detecting the pollutants cannot measure the actual emission amount of the pollutants of the vehicle, realizing closed-loop control on the emission of the pollutants by using the adjusted pollutant calculation model.
Optionally, under a specific condition, the closed-loop control of pollutant emission is implemented by using the adjusted pollutant calculation model, and the closed-loop control includes: and when the engine is in cold start and the sensor for detecting pollutants cannot measure the actual emission of pollutants of the vehicle, realizing closed-loop control on pollutant emission by using the adjusted pollutant calculation model.
Optionally, the pollutant comprises 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 intake system parameters and engine operation condition parameters of the engine when the vehicle runs; the working condition judging module is used for judging whether the operating working condition of the engine meets the preset working condition or not according to the operating working condition parameters of the engine; the displacement calculation module is used for determining the theoretical discharge amount of pollutants of the vehicle by utilizing a pollutant calculation model according to the fuel injection parameters, the air intake system parameters and the engine operation condition parameters 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 adjusting module is used for comparing and analyzing the theoretical emission and the actual emission of 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 discharge control module is used for realizing closed-loop control on pollutant discharge by utilizing the adjusted pollutant calculation model under the specified condition.
In a third aspect, an embodiment of the present application provides a driving computer, including a controller and a memory, wherein the memory stores computer program codes, and when the computer program codes in the memory are executed by the controller, the method for controlling pollutant emission of a vehicle is implemented.
In a fourth aspect, embodiments of the present application provide a vehicle comprising: a pollutant sensor for detecting an actual emission amount of pollutants; the engine sensor is used for acquiring fuel injection parameters, air intake system parameters and engine operating condition parameters of the engine; a cycle computer as hereinbefore described.
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 the vehicle pollutant emission control method as described above.
According to the vehicle pollutant emission control method, the pollutant emission calculation model is adjusted through the comparative analysis of the measured value and the calculated value of the pollutant emission, and the calculation accuracy of the pollutant emission calculation model is improved. The calculation model is loaded into a traveling computer and used for calculating the emission of subsequent pollutants, and when the pollutant sensor cannot work, the open-loop pollutant emission control is carried out through the calculation model, so that the accurate control of the emission of pollutants in the whole period can be realized.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention, in which:
FIG. 1 is a flow chart of a vehicle pollutant emission control method according to an exemplary embodiment of the present application;
FIG. 2 is a schematic view of the installation of vehicle exhaust emission related components according to an embodiment of the present application;
FIG. 3 is a schematic diagram of the operation of a vehicle pollutant emission control method according to one embodiment of the present application;
FIG. 4 is a schematic block diagram of a vehicle pollutant emission control system according to an exemplary embodiment of the present application;
in fig. 2, 1-Air Intake Throttle Valve (IAT), 2-Exhaust Throttle Valve (ETV), 3-Intake manifold, 4-engine, 5-Intake manifold temperature sensor, 6-Intake manifold pressure sensor, 7-Exhaust manifold, 8-Electronic Control Unit (ECU), Electronic Control Unit (also called traveling computer), 9-aftertreatment system (including DOC, DPF, SCR and ASC), 10-aftertreatment inlet nox sensor, 11-aftertreatment inlet temperature sensor, 12-Exhaust tail pipe nox sensor.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Due to the existence of dispersion of all parts of the engine, the initial pollutant calculation model precision in the traveling computer cannot be matched with all engines, so that when the pollutant calculation model is required to be adopted for open-loop control, the pollutant cannot be accurately controlled.
In order to reduce the influence of the individual difference of the engine on the precision of the pollutant calculation model, according to the technical scheme of the invention, in the determined cycle range, the pollutant emission quantity obtained by measuring the pollutant sensor at the outlet of the exhaust tail pipe collected by a traveling computer and the pollutant emission quantity obtained by calculating the pollutant calculation model are corrected and updated aiming at the pollutant calculation model through comparison and analysis, and the updated pollutant calculation model is loaded into the traveling computer. Therefore, each engine is provided with a pollutant calculation model which is adaptive to the engine, and the control of pollutant discharge amount is positively influenced.
Example one
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, characterized by comprising the steps of:
s110: and acquiring fuel injection parameters, air intake system parameters and engine operation condition parameters of the engine when the vehicle operates.
Fig. 2 is a schematic view illustrating installation of components related to exhaust emission of a vehicle according to an embodiment of the present application. Taking the pollutant as an example of nitrogen oxide, when a vehicle runs, an engine sensor feeds back parameters required by a pollutant calculation model for calculating the pollutant emission amount to a driving computer, wherein the parameters required by the pollutant calculation model comprise fuel injection parameters of the engine, air intake system parameters and engine running condition parameters.
S120: and judging whether the running working condition of the engine meets the preset working condition or not according to the running working condition parameters of the engine.
As an optional implementation manner, judging whether the operation condition of the engine meets the preset condition according to the engine operation condition parameter includes: comparing the accumulated cycle power of the engine with a preset cycle power threshold, and when the accumulated cycle power of the engine is greater than or equal to the preset cycle power threshold, determining the operating time duty ratio of the engine under each preset operating condition within the working time range of the engine corresponding to the accumulated cycle power, wherein the operating time duty ratio is the ratio of the operating time of the engine under each preset operating condition to the working time range of the engine corresponding to the accumulated cycle power; and when the operating time ratio of the engine under each preset operating condition is greater than or equal to the corresponding preset ratio threshold, judging that the operating condition of the engine meets the preset operating condition.
The preset cycle power threshold value can be set according to the specific conditions of the engine, for example, the preset cycle power threshold value of the engine which leaves a factory newly can be set to a larger value, because the wear degrees of all parts of the engine which leaves the factory newly are consistent, and the pollutant calculation model in the traveling computer can relatively accurately calculate the emission amount of pollutants of the vehicle, so that the pollutant calculation model can be adjusted at intervals of longer engine service time; in the middle or later stage of engine use, the preset cycle power threshold value can be set to a smaller value, because in the middle or later stage, the difference of the wear degrees of all parts of the engine is gradually enlarged, so that the pollutant calculation model in the traveling computer is difficult to match 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 for operating in an urban area, an operating condition for operating in a suburban area, or the like. Under different working conditions, the running speeds of the vehicles are different, so that the running working conditions of the engine are different.
The preset working condition may be, for example, a working condition that the engine needs to meet when the pollutant calculation model needs to be adjusted. That is, when the engine meets a preset operating condition, the adjustment of the pollutant calculation model is triggered.
As a specific example, the preset cycle work threshold value can be set to 1000J, and the accumulated cycle work reaches 1000J after the engine runs for 500 hours. In the 500 hours, the vehicle runs in the urban area for 300 hours and runs in the suburban area for 200 hours, so that the running time of the vehicle running in the urban area accounts for 60% of the 500 hours (is greater than 50% of the preset proportion threshold corresponding to the urban area running condition), and the running time of the vehicle running in the suburban area accounts for 40% of the 500 hours (is greater than 30% of the preset proportion threshold corresponding to the suburban area running condition), and therefore, the running condition of the engine is judged to meet the preset working condition.
S130: and when the operating condition of the engine is judged to meet the preset operating condition, determining the theoretical emission of pollutants of the vehicle by using a pollutant calculation model according to the fuel injection parameter, the air intake system parameter and the operating condition parameter of the engine.
The pollutants may include nitrogen oxides, carbon monoxide, hydrocarbons, sulfides, inhalable particles, and the like, which are not limited herein, and the technical solution of the present application is described by taking nitrogen oxides as an example.
S140: and acquiring the actual emission amount of pollutants of the vehicle.
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 and the actual emission of 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 a preset condition;
as an optional implementation, the preset condition includes: the sum of the absolute values of the differences between the corrected theoretical emissions and the actual emissions for each pollutant of the vehicle is minimal.
As a specific embodiment, the adjusted pollutant calculation model is used for calculating the corrected theoretical emission of each pollutant of the vehicle according to the fuel injection parameter, the air intake system parameter and the engine operation condition parameter of the engine, and the absolute value of the difference between the corrected theoretical emission and the actual emission of each pollutant of the vehicle is summed. And for each adjusted pollutant calculation model, when the sum value is minimum, determining that the adjusted pollutant calculation model meets a preset condition.
Taking nitrogen oxide as an example, the nitrogen oxide discharged from the exhaust gas of the vehicle may include nitrogen monoxide, nitrogen dioxide and oxygen, wherein the actual 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 and obtains that nitric oxide is 8 units, nitrogen dioxide is 16 units and oxygen is 7 units in pollutants discharged by the vehicle; after the nitrogen oxide calculation model is adjusted for the second time, the nitrogen oxide calculation model calculates and obtains 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 that nitrogen monoxide is 10 units, nitrogen dioxide is 19 units, and oxygen is 8 units of pollutants emitted by the vehicle. The sum of the absolute values of the differences between the corrected theoretical emissions and the actual emissions for each pollutant of the vehicle for the first adjustment is then: 2+4+3 ═ 9, a second time 1+2+1 ═ 4, and a third time: 0+1+2 ═ 3. It can be seen that after the third adjustment, the sum of the absolute values of the differences between the corrected theoretical emissions and the actual emissions of each pollutant of the vehicle is minimal, and therefore the nox calculation model after the third adjustment is loaded into the vehicle's driving computer.
As an optional implementation manner, the initial model of the pollutant calculation model may be used as the pollutant calculation model of the vehicle, and the pollutant calculation model satisfying the preset condition may be obtained quickly by adjusting based on the initial model.
Fig. 3 is a schematic view illustrating an operation principle of a pollutant emission control method of a vehicle according to an embodiment of the present application. As shown in fig. 3, the adaptive nox calculation module uses the initial nox calculation module as a feed-forward input, adjusts the adaptive nox calculation module by comparing the calculated output value of the nox of the adaptive nox calculation module with the measured value of the nox sensor, and participates in the closed-loop control of the nox emission of the vehicle after the adjustment is completed.
S160: and under the specified condition, closed-loop control on pollutant emission is realized by utilizing the adjusted pollutant calculation model.
As an alternative embodiment, under the specified conditions, the closed-loop control of pollutant emission is realized by using the adjusted pollutant calculation model, and the closed-loop control comprises the following steps: and when the sensor for detecting the pollutants cannot measure the actual emission amount of the pollutants of the vehicle, realizing closed-loop control on the emission of the pollutants by using the adjusted pollutant calculation model.
For example, when the sensor is damaged, the calculated output value of the adjusted pollutant calculation model can be directly used for participating in closed-loop control on pollutant emission.
As an alternative embodiment, under the specified conditions, the closed-loop control of pollutant emission is realized by using the adjusted pollutant calculation model, and the closed-loop control comprises the following steps: and when the engine is in cold start and the sensor for detecting pollutants cannot measure the actual emission of pollutants of the vehicle, realizing closed-loop control on pollutant emission by using the adjusted pollutant calculation model.
According to the technical scheme, the pollutant emission calculation model is adjusted through the comparative analysis of the measured value and the calculated value of the pollutant emission, and the calculation accuracy of the pollutant emission calculation model is improved. The calculation model is loaded into a traveling computer and used for calculating the emission amount of subsequent pollutants, and when the pollutant sensor cannot work, the model is used for carrying out open-loop control on pollutant emission, so that the accurate control on the emission amount of pollutants in the whole period can be realized.
The invention can realize the self-adaptive update of the pollutant calculation model in the whole life cycle of the engine, namely, when the running working condition of the engine meets the self-adaptive adjustment requirement, a running computer can activate the self-adaptive adjustment of the pollutant calculation model, and the self-adaptive adjustment of the pollutant calculation model is carried out according to the current state of the engine, thereby ensuring that the engine can realize the accurate control of the running working condition of the pollutant in the whole period of time in the emission quality guarantee period or even in the whole life cycle, and meeting the requirement of the emission regulation.
Because the individual difference of the engine is considered by the model, the influence of the difference of the individual parts of the engine on the pollutant calculation model can be effectively reduced, and the self-adaptive pollutant calculation model can be calibrated for engines of different application types, so that each engine has a pollutant calculation model adapted to the engine, the influence of the individual difference of the engine on the pollutant discharge amount is reduced, and the accurate control of the pollutant discharge amount is guaranteed.
The vehicle pollutant emission control method can effectively reduce the emission of pollutants In the exhaust tail pipe, is beneficial to meeting the emission control of nitrogen oxides at the initial stage of vehicle-mounted emission, and enables the emission level of the engine at the full operation period to meet the requirements of national sixth Europe, OBD, 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, an embodiment of the present application provides a vehicle pollutant emission control system 200, comprising: the parameter acquiring module 210 is configured to acquire a fuel injection parameter, an intake system parameter, and an engine operating condition parameter of the engine when the vehicle is running; the working condition judgment module 220 is used for judging whether the operating working condition of the engine meets a preset working condition according to the operating working condition parameter of the engine; the displacement calculation module 230 is used for determining the theoretical emission of pollutants of the vehicle by using a pollutant calculation model according to the fuel injection parameters, the air intake system parameters and the engine operation condition parameters of the engine when the operation condition of the engine is judged to meet the preset operation condition; a displacement detection module 240 for obtaining an actual displacement of pollutants of the vehicle; the model adjusting module 250 is used for comparing and analyzing the theoretical emission and the actual emission of 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 conditions; and the discharge control module 260 is configured to implement closed-loop control on pollutant discharge by using the adjusted pollutant calculation model under the specified condition.
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 four
An embodiment of the present application provides a vehicle including: a pollutant sensor for detecting an actual emission amount of pollutants; the engine sensor is used for acquiring fuel injection parameters, air intake system parameters and engine operating condition parameters of the engine; a cycle computer as hereinbefore described. Fig. 2 is a schematic view illustrating installation of components related to exhaust emission of a vehicle according to an embodiment of the present application. As an embodiment of the present application, taking a pollutant as a nitrogen oxide, 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 a nitrogen oxide model according to information fed back by an engine sensor (not shown in the figure), wherein the parameters include a fuel injection parameter, an intake system parameter and an engine operation condition parameter, when an engine operation condition satisfies a preset condition, the nitrogen oxide calculation model is adjusted to satisfy 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 the closed-loop control of the emission amount of the nitrogen oxide 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 merely for describing particular embodiments and are not intended to limit exemplary embodiments according to the present application, and when the terms "include" and/or "comprise" are used in this specification, they specify the presence of features, steps, operations, devices, components, and/or combinations thereof.
It should be understood that the exemplary embodiments herein 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 present invention.
Claims (10)
1. A method for controlling pollutant emissions from a vehicle, comprising the steps of:
acquiring fuel injection parameters, air intake system parameters and engine operation condition parameters of an engine when a vehicle runs;
judging whether the operating condition of the engine meets a preset operating condition or not according to the operating condition parameters of the engine;
when the operating condition of the engine is judged to meet the preset operating condition, determining the theoretical emission of pollutants of the vehicle by using a pollutant calculation model according to the fuel injection parameter, the air intake system parameter and the operating condition parameter of the engine;
acquiring the actual emission of pollutants of the vehicle;
comparing and analyzing the theoretical emission and the actual emission of 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 a preset condition;
and under the specified condition, closed-loop control on pollutant emission is realized by utilizing the adjusted pollutant calculation model.
2. The vehicle pollutant emission control method of claim 1, wherein judging whether the operation condition of the engine meets the preset condition according to the engine operation condition parameter comprises:
comparing the accumulated cycle power of the engine with a preset cycle power threshold, and when the accumulated cycle power of the engine is greater than or equal to the preset cycle power threshold, determining the operating time duty ratio of the engine under each preset operating condition within the working time range of the engine corresponding to the accumulated cycle power, wherein the operating time duty ratio is the ratio of the operating time of the engine under each preset operating condition to the working time range of the engine corresponding to the accumulated cycle power;
and when the operating time ratio of the engine under each preset operating condition is greater than or equal to the corresponding preset ratio threshold, judging that the operating condition of the engine meets the preset operating condition.
3. The vehicle pollutant emission control method of claim 1, wherein the preset conditions comprise:
the sum of the absolute values of the differences between the corrected theoretical emissions and the actual emissions for each pollutant of the vehicle is minimal.
4. The vehicle pollutant emission control method of claim 1, wherein under specified conditions, closed-loop control of pollutant emission is achieved by using the adjusted pollutant calculation model, and the method comprises the following steps:
and when the sensor for detecting the pollutants cannot measure the actual emission amount of the pollutants of the vehicle, realizing closed-loop control on the emission of the pollutants by using the adjusted pollutant calculation model.
5. The vehicle pollutant emission control method of claim 1, wherein under specified conditions, closed-loop control of pollutant emission is achieved by using the adjusted pollutant calculation model, and the method comprises the following steps:
and when the engine is in cold start and the sensor for detecting pollutants cannot measure the actual emission of pollutants of the vehicle, realizing closed-loop control on pollutant emission by using the adjusted pollutant calculation model.
6. The vehicle pollutant emission control method of any one of claims 1 to 5, wherein the pollutant comprises nitrogen oxide.
7. A vehicle pollutant emission control system, comprising:
the parameter acquisition module is used for acquiring fuel injection parameters, air intake system parameters and engine operation condition parameters of the engine when the vehicle runs;
the working condition judging module is used for judging whether the operating working condition of the engine meets the preset working condition or not according to the operating working condition parameters of the engine;
the displacement calculation module is used for determining the theoretical discharge amount of pollutants of the vehicle by utilizing a pollutant calculation model according to the fuel injection parameters, the air intake system parameters and the engine operation condition parameters 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 adjusting module is used for comparing and analyzing the theoretical emission and the actual emission of 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 discharge control module is used for realizing closed-loop control on pollutant discharge by utilizing the adjusted pollutant calculation model under the specified condition.
8. A driving computer, characterized by 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 emission amount of pollutants;
the engine sensor is used for acquiring fuel injection parameters, air intake system parameters and engine operating condition parameters of the engine;
the travel computer of claim 8.
10. A storage medium storing program code, characterized in that the program code, when executed by a processor, implements the steps of the vehicle pollutant emission control method according to any one of claims 1-6.
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