CN114991915B - Control method for improving economy of whole vehicle based on urea and fuel price change - Google Patents
Control method for improving economy of whole vehicle based on urea and fuel price change Download PDFInfo
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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
- 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]
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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
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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
- F02D41/30—Controlling fuel injection
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
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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
- F02D2250/00—Engine control related to specific problems or objectives
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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
- Y02T10/12—Improving ICE efficiencies
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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 relates to the technical field of automobile engines, and discloses a control method for improving the economy of a whole automobile based on urea and fuel price change. According to the control method for improving the economy of the whole vehicle based on the price change of the urea and the fuel, the control parameters are adjusted according to the price change of the urea and the fuel, and the comprehensive economy is optimized.
Description
Technical Field
The invention relates to the technical field of automobile engines, in particular to a control method for improving the economy of a whole automobile based on urea and fuel price change.
Background
To meet the national sixth emission standard, there are two routes: firstly, an EGR route is generally adopted, namely an EGR+VGT (supercharging route such as WGT) technical scheme is adopted, namely DOC+DPF+SCR+ASC technical scheme is adopted, wherein the EGR can play a role in reducing the emission of original NOx, and in addition, the superfluous NOx is treated by the SCR; the other is an SCR route, which usually adopts a technical scheme of WGT (supercharger route such as VGT) +DOC+DPF+SCR+ASC, and achieves the engineering goal of the original engine through matching of a combustion system and calibration optimization of a fuel injection system, the discharged NOx is treated to a reasonable level through SCR, and for the other key emission particles of the diesel engine, the two routes are both captured by the DPF, so that the emission requirement of PM is met.
When SCR is applied, the urea injection system can judge according to the operation working condition of the engine and the working state of the aftertreatment system, and urea injection is carried out when the condition of urea injection is met, which clearly causes two operation costs for the engine during operation: fuel consumption and urea consumption. In addition, the prices of the fuel and the urea are continuously changed, particularly the fluctuation range of the price of the diesel is large, the previous control strategy fails to consider the dynamic change process of the prices of the urea and the diesel, mainly considers the target NOx for control, cannot adjust the urea injection according to the prices of the urea and the fuel, cannot control the target NOx according to the change of the prices of the urea and the diesel, and has great discount on comprehensive economy.
The current engine control strategy is a fixed control mode, and is not adjusted according to the market price change of diesel and urea, data modeling analysis is performed through automatic calibration software in the calibration process, and the BSNOx is used as a boundary condition to perform global optimization of optimal economy, such as a conventional BSFC and BSNOx tradoff curve, and the optimization is performed by referring to the BSNOx-MIN_ref, the BSNOx-MAX_ref and the BSNOx-target_ref in such a way: BSNOx-MIN_ref represents the minimum boundary of BSNOx, when the boundary is reached, the problems of insufficient engine combustion economy, even higher smoke degree and the like can occur, BSNOx-MAX_ref represents the allowable upper limit of NOx bare engine emission, and the limitation is generally carried out by the hardware boundaries such as the size of an SCR carrier and the maximum injection quantity of a urea injection system; while BSNOx-target_ref represents the desired Target in meeting the economic and emission requirements, the optimization process is moved closer to the desired Target without touching the boundary, in practice global optimization is performed.
The Chinese patent (publication No. 2012, 08 and 01, publication No. CN 102619601A) discloses a control method of an SCR system of an electric control diesel engine, which takes a two-dimensional grid of rotation speed and torque, a two-dimensional grid of exhaust temperature and airspeed as a base point, and corresponds to the original NOx emission and NOx conversion efficiency to obtain the urea injection under a steady-state working condition; on the basis of the SCR steady-state control strategy, the urea injection quantity in the steady-state working condition is corrected by utilizing a correction model formed by an ammonia gas quantity storage function and an NH3 adsorption and desorption function, so that the control strategy of the SCR in the transient working condition is obtained. The method is applicable to almost all diesel engines on the basis of a model, and the subsequent work of manufacturers only carries out corresponding calibration tests for different models, so that the cost is reduced, the research and development period is shortened, and the research and development efficiency of an SCR system and a diesel engine complete machine factory is greatly improved. The invention also discloses an electronic control diesel SCR system adopting the control method. However, the method only relates to SCR system control, and does not relate to the influence of urea and fuel prices on the overall vehicle economy.
Chinese patent (publication No. CN107191251A, publication No. 2017, 09, 02) discloses a diesel engine aftertreatment system meeting the national six-emission requirement, comprising a low-temperature SCR urea aftertreatment system and a low Wen Penyou combustion-supporting catalytic regeneration DPF system; the DPF catalyst and the SCR catalyst are connected in series between the exhaust pipes by adopting flanges. The invention adopts the low-temperature burner, DOC, CDPF and SCR system to reach the national six-emission standard on the basis of the national five-diesel engine technology, does not need to carry out a large number of diesel engine in-machine heat management calibration, has independent post-treatment heat management calibration, reduces the in-machine and out-machine coupling calibration, has simple system installation and arrangement and convenient maintenance, and is suitable for the national six-post-treatment requirements of various domestic diesel engines. The method also does not relate to the effect of urea and fuel prices on overall vehicle economy.
Disclosure of Invention
The invention aims to overcome the defects of the technology, and provides a control method for improving the economy of the whole vehicle based on the price change of urea and fuel, wherein the control parameters are adjusted according to the price change of the urea and the fuel, so that the comprehensive economy is optimized.
In order to achieve the above purpose, the control method for improving the economy of the whole vehicle based on the price change of urea and fuel oil, which is designed by the invention, evaluates the comprehensive economy of urea required by SCR in a BSFC_r according to a price conversion mode:
BSFC_r＝BSFC+qBSNOx
wherein BSFC_r is the r-ratio fuel consumption, r is the price ratio of urea per kilogram to fuel per liter, BSFC effective fuel consumption rate, BSNOx converted fuel consumption rate, q is a coefficient,
wherein C/u CO(NH)2 The amount of the substance CO (NH) 2 was 60g/mol,
the amount of the substance being NO2 was 46g/mol ρ/u D Is fuel density of 0.83g/mL, ρ/u CO(NH)2 Is CO (NH) 2 Omega is the mass fraction of urea solution, tau is the mole ratio of urea to NOx reaction, and is 2, the current fuel price and urea price are input, the system evaluates the comprehensive BSFC according to the torque model, FIE model and NOx emission model of the engine, and then carries out corresponding MAP selection with different zone bits, and the zone bits and MAP are calibrated and solidified in a global DOE mode in the development stage.
Preferably, for the engine of the SCR technology route, after obtaining the current fuel price and urea price, the engine control module processes inside the controller according to r, and selects the corresponding MAP through the flag bit of fuel injection.
Preferably, when the price of the fuel oil is increased or the price of the urea is reduced to reduce r, the fuel-saving multi-consumption urea mode is entered, and the main injection timing or rail pressure is increased to ensure the BSFC level under the condition that the boundary condition of the SCR system is met.
Preferably, when the fuel price is reduced or the urea price is increased to cause r to be increased, the multi-consumption fuel and low-consumption urea mode is entered, and the main injection timing or rail pressure is reduced to ensure the BSFC level under the condition that the boundary condition of the SCR system is met.
Preferably, the original engine NOx emission changes along with the change of the fuel injection parameters, the urea injection quantity is correspondingly adjusted, and when the comprehensive economy is ensured through high NOx emission, the urea injection quantity is increased, and otherwise, the urea injection quantity is reduced.
Preferably, for an engine of the EGR technology route, after obtaining the current fuel price and urea price, the engine control module processes inside the controller according to r, and selects the corresponding MAP through the flag bit of fuel injection and the flag bit of EGR rate.
Preferably, when the fuel price increases or the urea price decreases to cause r to decrease, a high NOx emission scene is entered, and under the condition that the SCR system boundary and the minimum EGR rate boundary condition are met, the main injection timing or the rail pressure direction is increased, the EGR rate is reduced, and the BSFC level is ensured.
Preferably, when the fuel price is reduced or the urea price is increased to cause r to be increased, the low NOx emission scene is entered, the main injection timing or the rail pressure direction is reduced and the EGR rate is increased under the condition that the boundary of the SCR system and the boundary condition of the minimum EGR rate are met, and the BSFC level is ensured.
Preferably, the original engine NOx emission changes along with the change of the fuel injection parameters and the EGR rate, the urea injection quantity is correspondingly adjusted, and when the comprehensive economy is ensured through high NOx emission, the urea injection quantity is increased, and otherwise, the urea injection quantity is reduced.
Preferably, the basic calibration of the r value is obtained through a DOE mode, r is used as a guiding key factor to judge, if the latest urea and fuel price ratio is input and still is in the current interval, updating is not needed, otherwise, when a crossing area occurs, data updating is prompted, or whether updating is selected according to the preference of a driver.
In the invention, the basic reaction and calculation principle is as follows:
the NOx source results from the high temperature, oxygen-rich environment of the engine combustion process, and its system emissions depend on the original emissions and SCR reactions, both of which can affect the urea consumption level. For original engine emission, mainly depends on the hardware system of the engine, fuel injection parameters and the use level of EGR rate, which are related to engine combustion control, and other NOx which cannot meet the regulation requirement is consumed by SCR, and the chemical reaction is the SCR process. The whole process of eliminating NOx is mainly divided into two parts of urea hydrolysis reaction and NOx reduction reaction, and finally nitrogen and water are generated, wherein the reaction formula is as follows:
hydrolysis reaction:
(NH2) 2 CO→NH 3 +HNCO
HNCO+H 2 O→NH+CO
standard reaction:
4NH3+4NO+O2→4N2+6H2O
the rapid reaction:
4NH3+2NO+2NO2→4N2+6H2O
to more reasonably balance fuel consumption, urea consumption, and emissions levels, we therefore rate the urea required by the SCR in bsfc_r in a cost-effective manner for comprehensive economy.
Compared with the prior art, the invention has the following advantages:
1. the control parameters can be adjusted according to the price change of urea and fuel;
2. the method can directionally guide the driver to update or not according to the urea price and the fuel price change input;
3. optimizing the comprehensive economy;
4. the calibration is more predictive.
Drawings
FIG. 1 is a graph of the tradoff curves of BSFC and BSNOx in a control method for improving the economy of a vehicle based on urea and fuel price changes;
FIG. 2 is a graph of the tradeoff curves of BSFC and BSNOx of the prior art;
FIG. 3 is a control strategy diagram of an SCR technology route engine;
FIG. 4 is a control strategy diagram of an EGR technology route engine.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The invention relates to an interventional variable target control mode, which can be used for optimally controlling a guide instruction given by a driver or a service station, or can be used for optimally controlling pushing of big data from the Internet of vehicles, and finally, the aim of optimizing comprehensive economy is fulfilled. The present illustration is schematically illustrated by a single point illustration, such as fig. 1 is a tradeoff curve of a conventional BSFC and BSNOx, where BSNOx-min_ref represents a minimum boundary of BSNOx, when the boundary is touched, problems such as insufficient engine combustion, poor economy and even high smoke level occur, BSNOx-max_ref represents an allowable upper limit of bare engine emission of NOx, and is generally limited by a hardware boundary such as SCR carrier size and a maximum injection amount of a urea injection system; while BSNOx-target_ref represents the desired objective in meeting the economic and emission requirements, bfsc_r represents the urea price divided by the integrated BSFC where the fuel price equals r, where bfsc_0 represents the integrated BSFC in which urea is the free state and the tradeoff relationship of BSNOx, which is a state where the lowest fuel consumption that the engine can achieve is the best integrated economy of the engine, which is absent, affected by market factors, r fluctuates within a certain range, and the meaning that r=0 exists is used as an integrated evaluation reference; BSFC-synthesis ref is a reference for comprehensive economy assessment based on the optimal value of the prices of urea and fuel (without regard to NOx boundaries) for a single point example, which is treated in a weighted manner in the global DOE, and the single point is used only for demonstration, and the detailed DOE optimization process is not the subject of the present invention.
Example 1
A control method for improving the economy of a whole vehicle based on the price change of urea and fuel oil comprises the step of evaluating the comprehensive economy of urea required by SCR in a BSFC_r according to a price conversion mode:
BSFC_r＝BSFC+qBSNOx
wherein BSFC_r is the r-ratio fuel consumption, r is the price ratio of urea per kilogram to fuel per liter, BSFC effective fuel consumption rate, BSNOx converted fuel consumption rate, q is a coefficient,
wherein C/u CO(NH)2 The amount of the substance CO (NH) 2 was 60g/mol,
the amount of the substance being NO2 was 46g/mol ρ/u D Is fuel density of 0.83g/mL, ρ/u CO(NH)2 Is CO (NH) 2 Omega is the mass fraction of urea solution, is 32.5%, τ is the reaction of urea with NOxThe current fuel price and the current urea price are input for 2, the system evaluates the comprehensive BSFC according to a torque model, a FIE model and a NOx emission model of the engine, and then corresponding MAP selection is carried out by using different zone bits, and the zone bits and the MAP are calibrated and solidified in a global DOE mode in a development stage.
Example 2
A control method for improving the economy of a whole vehicle based on the price change of urea and fuel oil comprises the step of evaluating the comprehensive economy of urea required by SCR in a BSFC_r according to a price conversion mode:
BSFC_r＝BSFC+qBSNOx
wherein BSFC_r is the r-ratio fuel consumption, r is the price ratio of urea per kilogram to fuel per liter, BSFC effective fuel consumption rate, BSNOx converted fuel consumption rate, q is a coefficient,
wherein C/u CO(NH)2 The amount of the substance CO (NH) 2 was 60g/mol,
the amount of the substance being NO2 was 46g/mol ρ/u D Is fuel density of 0.83g/mL, ρ/u CO(NH)2 Is CO (NH) 2 Omega is the mass fraction of urea solution, tau is the mole ratio of urea to NOx, and is 2, the current fuel price and urea price are input, the system evaluates the comprehensive BSFC according to the torque model, FIE model and NOx emission model of the engine, and then carries out corresponding MAP selection by different zone bits, and the zone bits and MAP are calibrated and solidified in a global DOE mode in the development stage.
As shown in fig. 3, for the engine of the SCR technology route, after obtaining the current fuel price and urea price, the engine control module processes inside the controller according to r, and selects the corresponding MAP through the flag bit of fuel injection.
When the fuel price is increased or the urea price is reduced to reduce r, the fuel-saving multi-consumption urea mode is entered, and under the condition that the boundary condition of the SCR system is met, the main injection timing or rail pressure is increased, so that the BSFC level is ensured.
When the fuel price is reduced or the urea price is increased to cause the r to be increased, the fuel enters a multi-consumption and low-consumption urea mode, and the main injection timing or rail pressure is reduced to ensure the BSFC level under the condition that the boundary condition of the SCR system is met.
Example 3
A control method for improving the economy of a whole vehicle based on the price change of urea and fuel oil comprises the step of evaluating the comprehensive economy of urea required by SCR in a BSFC_r according to a price conversion mode:
BSFC_r＝BSFC+qBSNOx
wherein BSFC_r is the r-ratio fuel consumption, r is the price ratio of urea per kilogram to fuel per liter, BSFC effective fuel consumption rate, BSNOx converted fuel consumption rate, q is a coefficient,
wherein C/u CO(NH)2 The amount of the substance CO (NH) 2 was 60g/mol,
the amount of the substance being NO2 was 46g/mol ρ/u D Is fuel density of 0.83g/mL, ρ/u CO(NH)2 Is CO (NH) 2 Omega is the mass fraction of urea solution, tau is the mole ratio of urea to NOx, and is 2, the current fuel price and urea price are input, the system evaluates the comprehensive BSFC according to the torque model, FIE model and NOx emission model of the engine, and then carries out corresponding MAP selection by different zone bits, and the zone bits and MAP are calibrated and solidified in a global DOE mode in the development stage.
As shown in fig. 3, for the engine of the SCR technology route, after obtaining the current fuel price and urea price, the engine control module processes inside the controller according to r, and selects the corresponding MAP through the flag bit of fuel injection.
When the fuel price is increased or the urea price is reduced to reduce r, the fuel-saving multi-consumption urea mode is entered, and under the condition that the boundary condition of the SCR system is met, the main injection timing or rail pressure is increased, so that the BSFC level is ensured.
When the fuel price is reduced or the urea price is increased to cause the r to be increased, the fuel enters a multi-consumption and low-consumption urea mode, and the main injection timing or rail pressure is reduced to ensure the BSFC level under the condition that the boundary condition of the SCR system is met.
As the original engine NOx emission changes along with the change of the fuel injection parameters, the urea injection quantity is correspondingly adjusted, when the comprehensive economy is ensured through high NOx emission, the urea injection quantity is increased, and otherwise, the urea injection quantity is reduced.
Example 4
A control method for improving the economy of a whole vehicle based on the price change of urea and fuel oil comprises the step of evaluating the comprehensive economy of urea required by SCR in a BSFC_r according to a price conversion mode:
BSFC_r＝BSFC+qBSNOx
wherein BSFC_r is the r-ratio fuel consumption, r is the price ratio of urea per kilogram to fuel per liter, BSFC effective fuel consumption rate, BSNOx converted fuel consumption rate, q is a coefficient,
wherein C/u CO(NH)2 The amount of the substance CO (NH) 2 was 60g/mol,
the amount of the substance being NO2 was 46g/mol ρ/u D Is fuel density of 0.83g/mL, ρ/u CO(NH)2 Is CO (NH) 2 Omega is the mass fraction of urea solution, is 32.5%, τ is the molar ratio of urea to NOx reaction, is 2, the current fuel price and urea price are input, and the system is based on the engine's own torque model, FIE model and NOx emissionsThe model evaluates the comprehensive BSFC, then carries out corresponding MAP selection by using different zone bits, and the zone bits and the MAP are calibrated and solidified in a global DOE mode in the development stage.
As shown in fig. 4, for an engine of an EGR technology route, after obtaining a current fuel price and urea price, an engine control module processes inside a controller according to r, and selects a corresponding MAP through a flag bit of fuel injection and an EGR rate flag bit.
When the fuel price is increased or the urea price is reduced to reduce r, the fuel enters a high NOx emission scene, and under the condition that the boundary condition of the SCR system and the boundary condition of the minimum EGR rate are met, the main injection timing or the rail pressure direction is increased, the EGR rate is reduced, and the BSFC level is ensured.
When the fuel price is reduced or the urea price is increased to cause the rise of r, the fuel enters a low NOx emission scene, the main injection timing or the rail pressure direction is reduced and the EGR rate is increased under the condition that the boundary of the SCR system and the boundary condition of the minimum EGR rate are met, and the BSFC level is ensured.
Example 5
A control method for improving the economy of a whole vehicle based on the price change of urea and fuel oil comprises the step of evaluating the comprehensive economy of urea required by SCR in a BSFC_r according to a price conversion mode:
BSFC_r＝BSFC+qBSNOx
wherein BSFC_r is the r-ratio fuel consumption, r is the price ratio of urea per kilogram to fuel per liter, BSFC effective fuel consumption rate, BSNOx converted fuel consumption rate, q is a coefficient,
wherein C/u CO(NH)2 The amount of the substance CO (NH) 2 was 60g/mol,
the amount of the substance being NO2 was 46g/mol ρ/u D Is fuel density of 0.83g/mL, ρ/u CO(NH)2 Is CO (NH) 2 Is of density, omega isThe mass fraction of the urea solution is 32.5%, τ is the mole ratio of urea to NOx reaction and is 2, the current fuel price and urea price are input, the system evaluates the comprehensive BSFC according to the torque model, FIE model and NOx emission model of the engine, and then corresponding MAP selection is carried out by using different zone bits, and the zone bits and MAP are calibrated and solidified in a global DOE mode in the development stage.
As shown in fig. 4, for an engine of an EGR technology route, after obtaining a current fuel price and urea price, an engine control module processes inside a controller according to r, and selects a corresponding MAP through a flag bit of fuel injection and an EGR rate flag bit.
When the fuel price is increased or the urea price is reduced to reduce r, the fuel enters a high NOx emission scene, and under the condition that the boundary condition of the SCR system and the boundary condition of the minimum EGR rate are met, the main injection timing or the rail pressure direction is increased, the EGR rate is reduced, and the BSFC level is ensured.
When the fuel price is reduced or the urea price is increased to cause the rise of r, the fuel enters a low NOx emission scene, the main injection timing or the rail pressure direction is reduced and the EGR rate is increased under the condition that the boundary of the SCR system and the boundary condition of the minimum EGR rate are met, and the BSFC level is ensured.
As the original engine NOx emission changes along with the change of the fuel injection parameters and the EGR rate, the urea injection quantity is correspondingly regulated, when the comprehensive economy is ensured through high NOx emission, the urea injection quantity is increased, and otherwise, the urea injection quantity is reduced.
Example 6
A control method for improving the economy of a whole vehicle based on the price change of urea and fuel oil comprises the step of evaluating the comprehensive economy of urea required by SCR in a BSFC_r according to a price conversion mode:
BSFC_r＝BSFC+qBSNOx
wherein BSFC_r is the r-ratio fuel consumption, r is the price ratio of urea per kilogram to fuel per liter, BSFC effective fuel consumption rate, BSNOx converted fuel consumption rate, q is a coefficient,
wherein C/u CO(NH)2 The amount of the substance CO (NH) 2 was 60g/mol,
the amount of the substance being NO2 was 46g/mol ρ/u D Is fuel density of 0.83g/mL, ρ/u CO(NH)2 Is CO (NH) 2 Omega is the mass fraction of urea solution, tau is the mole ratio of urea to NOx, and is 2, the current fuel price and urea price are input, the system evaluates the comprehensive BSFC according to the torque model, FIE model and NOx emission model of the engine, and then carries out corresponding MAP selection by different zone bits, and the zone bits and MAP are calibrated and solidified in a global DOE mode in the development stage.
For the engine of the SCR technical route, after the current fuel price and the urea price are obtained, the engine control module processes the fuel according to r in the controller, and the corresponding MAP is selected through the flag bit of fuel injection.
When the fuel price is increased or the urea price is reduced to reduce r, the fuel-saving multi-consumption urea mode is entered, and under the condition that the boundary condition of the SCR system is met, the main injection timing or rail pressure is increased, so that the BSFC level is ensured.
When the fuel price is reduced or the urea price is increased to cause the r to be increased, the fuel enters a multi-consumption and low-consumption urea mode, and the main injection timing or rail pressure is reduced to ensure the BSFC level under the condition that the boundary condition of the SCR system is met.
The original engine NOx emission changes along with the change of the fuel injection parameters, the urea injection quantity is correspondingly adjusted, and when the comprehensive economy is ensured through high NOx emission, the urea injection quantity is increased, otherwise, the urea injection quantity is reduced.
The above operations are all completed automatically, and the main data basis is from a global DOE model in the development process, in particular: the basic calibration of the r value is obtained through a DOE mode, r is used as a guiding key factor to judge, if the latest urea and fuel price ratio is input and still is in the current interval, updating is not needed, otherwise, when a crossing area appears, data updating is prompted, or whether updating is selected according to the preference of a driver.
Example 7
A control method for improving the economy of a whole vehicle based on the price change of urea and fuel oil comprises the step of evaluating the comprehensive economy of urea required by SCR in a BSFC_r according to a price conversion mode:
BSFC_r＝BSFC+qBSNOx
wherein BSFC_r is the r-ratio fuel consumption, r is the price ratio of urea per kilogram to fuel per liter, BSFC effective fuel consumption rate, BSNOx converted fuel consumption rate, q is a coefficient,
wherein C/u CO(NH)2 The amount of the substance CO (NH) 2 was 60g/mol,
the amount of the substance being NO2 was 46g/mol ρ/u D Is fuel density of 0.83g/mL, ρ/u CO(NH)2 Is CO (NH) 2 Omega is the mass fraction of urea solution, tau is the mole ratio of urea to NOx, and is 2, the current fuel price and urea price are input, the system evaluates the comprehensive BSFC according to the torque model, FIE model and NOx emission model of the engine, and then carries out corresponding MAP selection by different zone bits, and the zone bits and MAP are calibrated and solidified in a global DOE mode in the development stage.
For an engine of an EGR technical route, after the current fuel price and the current urea price are obtained, an engine control module processes inside a controller according to r, and corresponding MAP is selected through a flag bit of fuel injection and a flag bit of EGR rate.
When the fuel price is increased or the urea price is reduced to reduce r, the fuel enters a high NOx emission scene, and under the condition that the boundary condition of the SCR system and the boundary condition of the minimum EGR rate are met, the main injection timing or the rail pressure direction is increased, the EGR rate is reduced, and the BSFC level is ensured.
When the fuel price is reduced or the urea price is increased to cause the rise of r, the fuel enters a low NOx emission scene, the main injection timing or the rail pressure direction is reduced and the EGR rate is increased under the condition that the boundary of the SCR system and the boundary condition of the minimum EGR rate are met, and the BSFC level is ensured.
The original engine NOx emission changes along with the change of fuel injection parameters and EGR rate, the urea injection quantity is correspondingly adjusted, and when the comprehensive economy is ensured through high NOx emission, the urea injection quantity is increased, otherwise, the urea injection quantity is reduced.
The above operations are all completed automatically, and the main data basis is from a global DOE model in the development process, in particular: according to the invention, for the current calibration means, the basic calibration of the r value is obtained through the DOE mode, and the use scene as much as possible is covered in the modeling process, so that enough data are provided for corresponding modeling. In the modeling process, different urea price ratios are optimized except for adhering to calibration and hardware boundaries, usually, a region with high possibility is selected to be optimized in detail, such as a range of 0.3-0.6, step sizes can be properly increased for other parts, so that basic calibration of various r values can be obtained, r is used as a guiding key factor to judge, if the latest urea and fuel price ratio is input and still is in the current region, updating is not needed, otherwise, data updating is prompted when a crossing region appears, a scheme with the best comprehensive economy is selected, and whether updating is performed or not can be selected according to the preference of a driver.
In the above embodiment, the current fuel price and the urea price may be manually input by the driver, or may be obtained from the network by means of popularization with the internet of vehicles, and then pushed and reminded by the big data system, and the driver confirms that the final control switching is completed.
The control method for improving the economy of the whole vehicle based on the price change of the urea and the fuel oil can adjust control parameters according to the price change of the urea and the fuel oil; the method can directionally guide the driver to update or not according to the urea price and the fuel price change input; optimizing the comprehensive economy; the calibration is more predictive.
Here, it should be noted that the description of the above technical solution is exemplary, and the present specification may be embodied in different forms and should not be construed as being limited to the technical solution set forth herein. Rather, these descriptions will be provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Furthermore, the technical solution of the invention is limited only by the scope of the claims.
The disclosure of aspects of the present specification and claims is merely an example and, therefore, the specification and claims are not limited to the details shown. In the above description, when a detailed description of related known functions or configurations is determined to unnecessarily obscure the gist of the present specification and claims, the detailed description will be omitted.
Where the terms "comprising," "having," and "including" are used in this specification, there may be additional or alternative parts unless the use is made, the terms used may generally be in the singular but may also mean the plural.
Finally, it should be noted that the above description of the invention in connection with the specific embodiments is not to be considered as limiting the practice of the invention to these descriptions, and that simple alternatives, which would be apparent to one of ordinary skill in the art to which the invention pertains without departing from its spirit, are deemed to be within the scope of the invention. The above embodiments are merely representative examples of the present invention. Obviously, the invention is not limited to the above-described embodiments, but many variations are possible. Any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention should be considered to be within the scope of the present invention.
Meanwhile, it should be noted that the above description of the technical solution is exemplary, and the present specification may be embodied in various forms and should not be construed as being limited to the technical solution set forth herein. Rather, these descriptions will be provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Furthermore, the technical solution of the invention is limited only by the scope of the claims. The features of the various embodiments of the invention may be combined or spliced with one another, either in part or in whole, and may be implemented in a variety of different configurations as will be well understood by those skilled in the art. Embodiments of the present invention may be performed independently of each other or may be performed together in an interdependent relationship.
It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the invention, and the above-described structure should be considered to be within the scope of the invention.
Claims (10)
1. A control method for improving the economy of a whole vehicle based on urea and fuel price change is characterized by comprising the following steps: the urea required by SCR is evaluated for comprehensive economy by BSFC_r according to a price conversion mode:
BSFC_r＝BSFC+qBSNOx
wherein BSFC_r is the r-ratio fuel consumption, r is the price ratio of urea per kilogram to fuel per liter, BSFC effective fuel consumption rate, BSNOx converted fuel consumption rate, q is a coefficient,
wherein C/u CO(NH)2 Is CO (NH) 2 The amount of the substances is 60g/mol,
is NO 2 The amount of the substance was 46g/mol, ρ. U- D Is fuel density of 0.83g/mL, ρ/u CO(NH)2 Is CO (NH) 2 Omega is the mass fraction of urea solution, is 32.5%, τ is urea and NOxThe molar ratio of the reaction is 2, the current fuel price and the current urea price are input, the system evaluates the comprehensive BSFC according to the torque model, the FIE model and the NOx emission model of the engine, and then corresponding MAP selection is carried out by using different zone bits, and the zone bits and the MAP are calibrated and solidified in a global DOE mode in the development stage.
2. The control method for improving the economy of the whole vehicle based on the price change of urea and fuel according to claim 1, wherein the control method comprises the following steps: for the engine of the SCR technical route, after the current fuel price and the urea price are obtained, the engine control module processes the fuel according to r in the controller, and the corresponding MAP is selected through the flag bit of fuel injection.
3. The control method for improving the economy of the whole vehicle based on the price change of urea and fuel according to claim 2, wherein the control method comprises the following steps: when the fuel price is increased or the urea price is reduced to reduce r, the fuel-saving multi-consumption urea mode is entered, and under the condition that the boundary condition of the SCR system is met, the main injection timing or rail pressure is increased, so that the BSFC level is ensured.
4. The control method for improving the economy of the whole vehicle based on the price change of urea and fuel according to claim 2, wherein the control method comprises the following steps: when the fuel price is reduced or the urea price is increased to cause the r to be increased, the fuel enters a multi-consumption and low-consumption urea mode, and the main injection timing or rail pressure is reduced to ensure the BSFC level under the condition that the boundary condition of the SCR system is met.
5. The control method for improving the economy of the whole vehicle based on the price change of urea and fuel according to claim 3 or 4, characterized by comprising the following steps: the original engine NOx emission changes along with the change of the fuel injection parameters, the urea injection quantity is correspondingly adjusted, and when the comprehensive economy is ensured through high NOx emission, the urea injection quantity is increased, otherwise, the urea injection quantity is reduced.
6. The control method for improving the economy of the whole vehicle based on the price change of urea and fuel according to claim 1, wherein the control method comprises the following steps: for an engine of an EGR technical route, after the current fuel price and the current urea price are obtained, an engine control module processes inside a controller according to r, and corresponding MAP is selected through a flag bit of fuel injection and a flag bit of EGR rate.
7. The control method for improving the economy of the whole vehicle based on the price change of urea and fuel according to claim 6, wherein the control method comprises the following steps: when the fuel price is increased or the urea price is reduced to reduce r, the fuel enters a high NOx emission scene, and under the condition that the boundary condition of the SCR system and the boundary condition of the minimum EGR rate are met, the main injection timing or the rail pressure direction is increased, the EGR rate is reduced, and the BSFC level is ensured.
8. The control method for improving the economy of the whole vehicle based on the price change of urea and fuel according to claim 6, wherein the control method comprises the following steps: when the fuel price is reduced or the urea price is increased to cause the rise of r, the fuel enters a low NOx emission scene, the main injection timing or the rail pressure direction is reduced and the EGR rate is increased under the condition that the boundary of the SCR system and the boundary condition of the minimum EGR rate are met, and the BSFC level is ensured.
9. The control method for improving the economy of the whole vehicle based on the price change of urea and fuel according to claim 7 or 8, characterized by: the original engine NOx emission changes along with the change of fuel injection parameters and EGR rate, the urea injection quantity is correspondingly adjusted, and when the comprehensive economy is ensured through high NOx emission, the urea injection quantity is increased, otherwise, the urea injection quantity is reduced.
10. The control method for improving the economy of the whole vehicle based on the price change of urea and fuel according to claim 1, wherein the control method comprises the following steps: the basic calibration of the r value is obtained through a DOE mode, r is used as a guiding key factor to judge, if the latest urea and fuel price ratio is input and still is in the current interval, updating is not needed, otherwise, when a crossing area appears, data updating is prompted, or whether updating is selected according to the preference of a driver.
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