CN114961933A - Ammonia injection amount control method and system of SCR system - Google Patents
Ammonia injection amount control method and system of SCR system Download PDFInfo
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- CN114961933A CN114961933A CN202210509753.XA CN202210509753A CN114961933A CN 114961933 A CN114961933 A CN 114961933A CN 202210509753 A CN202210509753 A CN 202210509753A CN 114961933 A CN114961933 A CN 114961933A
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 532
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 266
- 238000002347 injection Methods 0.000 title claims abstract description 205
- 239000007924 injection Substances 0.000 title claims abstract description 205
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000012937 correction Methods 0.000 claims abstract description 114
- 238000004364 calculation method Methods 0.000 claims description 11
- 230000001174 ascending effect Effects 0.000 claims description 8
- 230000004048 modification Effects 0.000 claims description 6
- 238000012986 modification Methods 0.000 claims description 6
- 230000009194 climbing Effects 0.000 claims description 4
- 238000012545 processing Methods 0.000 description 17
- 238000010586 diagram Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 102100028379 Methionine aminopeptidase 1 Human genes 0.000 description 1
- 101710161855 Methionine aminopeptidase 1 Proteins 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
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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
-
- 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
-
- 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
-
- 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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/08—Parameters used for exhaust control or diagnosing said parameters being related to the engine
-
- 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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/10—Parameters used for exhaust control or diagnosing said parameters being related to the vehicle or its components
-
- 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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/12—Parameters used for exhaust control or diagnosing said parameters being related to the vehicle exterior
-
- 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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
- F01N2900/1404—Exhaust gas temperature
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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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
- F01N2900/1621—Catalyst conversion efficiency
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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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The application provides an ammonia injection amount control method and system of an SCR system, when the condition of a road in front of a vehicle is detected to be an uphill working condition, torque required by an engine for uphill when the vehicle keeps the current speed is calculated according to road condition information; if the torque meets the requirement of a preset road condition, controlling the vehicle to maintain the current gear, and determining the target exhaust temperature according to the torque and the current rotating speed; determining a basic value of ammonia injection correction according to a correction distance calculated according to the gradient and the length of an uphill working condition; based on the current airspeed, the target exhaust temperature and the actual ammonia storage amount, correcting a basic value of ammonia injection correction based on the target exhaust temperature and the current exhaust temperature of the engine to obtain a first ammonia injection amount, and obtaining a second ammonia injection amount; correcting the second ammonia injection amount based on the current SCR treatment efficiency to obtain a third ammonia injection amount; the SCR system is controlled to inject the corresponding ammonia based on a target ammonia injection amount determined according to the third ammonia injection amount and the current ammonia injection amount.
Description
Technical Field
The invention relates to the technical field of vehicle aftertreatment, in particular to an ammonia injection amount control method and system of an SCR system.
Background
With the widespread use of vehicles, the demand for conversion efficiency of a Selective Catalytic Reduction (SCR) system is increasing. In order to meet the conversion efficiency requirements of the SCR system, the SCR system needs to have sufficient ammonia storage to participate in the reaction.
Currently, the ammonia of the SCR system consists of two parts, namely SCR ammonia storage and real-time injection of urea quantity. However, when the SCR system is increased along with the exhaust temperature of the engine, the ammonia storage amount is obviously reduced; when the road condition in front of the vehicle is an uphill road condition, the load of the engine is increased suddenly, and when the load of the engine is increased suddenly, the exhaust temperature of the engine is increased, so that ammonia leakage occurs, and the emission of NOx exceeds the standard.
Therefore, how to provide a way to control the ammonia injection amount of the SCR system, when the exhaust temperature of the engine rises, to avoid ammonia leakage, is a problem that needs to be solved in this application.
Disclosure of Invention
In view of the above, the present invention provides a method and a system for controlling ammonia injection amount of an SCR system, so as to solve the problem in the prior art that when the road condition in front of a vehicle is an uphill road condition, the exhaust temperature of an engine is increased due to sudden load increase of the engine, and ammonia leakage occurs.
In a first aspect of the present invention, a method for controlling an ammonia injection amount of an SCR system is disclosed, the method comprising:
when the road condition in front of the vehicle is detected to be an uphill working condition, acquiring road condition information of the vehicle;
according to the road condition information, calculating the engine torque required by the vehicle for climbing a slope under the condition that the vehicle keeps the current speed unchanged;
if the torque of the engine meets the requirement of a preset road condition, controlling the vehicle to maintain the current gear and acquiring the current rotating speed of the engine;
determining a target exhaust temperature of the engine based on the engine torque and a current speed of the engine;
acquiring the gradient and the length of the uphill working condition, and calculating a correction distance according to the gradient and the length;
determining a base value for the ammonia injection correction based on the correction distance and the target exhaust temperature;
acquiring the current exhaust temperature of the engine, and correcting the basic value of ammonia injection correction based on the target exhaust temperature and the current exhaust temperature of the engine to obtain a first ammonia injection amount;
acquiring the current airspeed and the actual ammonia storage value of the engine, and correcting the first ammonia injection amount based on the current airspeed, the target exhaust temperature and the actual ammonia storage amount to obtain a second ammonia injection amount;
acquiring the current SCR treatment efficiency of an SCR system, and correcting the second ammonia injection amount based on the current SCR treatment efficiency to obtain a third ammonia injection amount;
and acquiring the current ammonia injection amount of the SCR system, determining a target ammonia injection amount according to the third ammonia injection amount and the current ammonia injection amount, and controlling the SCR system to inject corresponding ammonia based on the target ammonia injection amount.
Optionally, the road condition information at least includes a vehicle weight, a current vehicle speed, an uphill gradient, and a resistance coefficient, and according to the road condition information, the engine torque required by the vehicle to uphill is calculated when the engine of the vehicle keeps the current vehicle speed unchanged, including:
and calculating the engine torque required by the vehicle to ascend the slope under the condition that the vehicle keeps the current vehicle speed unchanged by the engine of the vehicle according to the vehicle weight, the current vehicle speed, the ascending slope and the resistance coefficient.
Optionally, the method further includes:
judging whether the torque of the engine is larger than the torque indicated by the preset road condition requirement;
if the engine torque is larger than the torque indicated by the preset road condition requirement, determining that the engine torque meets the preset road condition requirement;
and if the engine torque is not greater than the torque indicated by the preset road condition requirement, determining that the engine torque does not meet the preset road condition requirement, controlling the vehicle to downshift, and returning to execute judgment to determine whether the engine torque is greater than the torque indicated by the preset road condition requirement.
Optionally, the obtaining a current exhaust temperature of the engine, and correcting the basic value of the ammonia injection correction based on the target exhaust temperature and the current exhaust temperature of the engine to obtain a first ammonia injection amount includes:
acquiring the current exhaust temperature of the engine;
calculating the difference value between the current exhaust temperature of the engine and the target exhaust temperature, and determining a first correction coefficient according to the difference value between the current exhaust temperature of the engine and the target exhaust temperature;
and correcting the basic value of the ammonia injection correction based on the first correction coefficient to obtain a first ammonia injection amount.
Optionally, the current airspeed and the actual ammonia storage value of the engine are obtained, and the first ammonia injection amount is corrected based on the current airspeed, the target exhaust temperature and the actual ammonia storage amount, so as to obtain a second ammonia injection amount;
obtaining a current airspeed and an actual ammonia stored value of the engine;
determining a target ammonia value based on a current airspeed and the target exhaust temperature;
and determining a second correction coefficient according to the actual ammonia value and the target ammonia value, and correcting the first ammonia injection amount based on the second correction coefficient to obtain a second ammonia injection amount.
Optionally, the obtaining a current SCR processing efficiency of the SCR system, and correcting the second ammonia injection amount based on the current SCR processing efficiency to obtain a third ammonia injection amount includes:
acquiring the current SCR treatment efficiency of an SCR system;
and determining a third correction coefficient according to the current SCR treatment efficiency, and correcting the second ammonia injection amount based on the third correction coefficient to obtain a third ammonia injection amount.
In a second aspect of the present invention, an ammonia injection amount control system of an SCR system is disclosed, the system comprising:
the road condition information acquisition unit is used for acquiring the road condition information of the vehicle when the road condition in front of the vehicle is detected to be an uphill working condition;
the engine torque calculation unit is used for calculating the engine torque required by the vehicle for climbing uphill under the condition that the vehicle keeps the current speed unchanged according to the road condition information;
the gear maintaining unit is used for controlling the vehicle to maintain a current gear and acquiring the current rotating speed of the engine if the torque of the engine meets the requirement of a preset road condition;
a target exhaust temperature determination unit for determining a target exhaust temperature of the engine based on the engine torque and a current rotation speed of the engine;
the correction distance calculation unit is used for acquiring the gradient and the length of the uphill working condition and calculating a correction distance according to the gradient and the length;
an ammonia injection amount correction base value determination unit configured to determine a base value of the ammonia injection correction based on the correction distance and the target exhaust gas temperature;
the first correction unit is used for acquiring the current exhaust temperature of the engine and correcting the basic value of the ammonia injection correction based on the target exhaust temperature and the current exhaust temperature of the engine to obtain a first ammonia injection amount;
the second correction unit is used for acquiring the current airspeed and the actual ammonia storage value of the engine, and correcting the first ammonia injection amount based on the current airspeed, the target exhaust temperature and the actual ammonia storage amount to obtain a second ammonia injection amount;
the third correction unit is used for acquiring the current SCR treatment efficiency of the SCR system and correcting the second ammonia injection amount based on the current SCR treatment efficiency to obtain a third ammonia injection amount;
and the target ammonia injection amount determining unit is used for acquiring the current ammonia injection amount of the SCR system, determining the target ammonia injection amount according to the third ammonia injection amount and the current ammonia injection amount, and controlling the SCR system to inject the corresponding ammonia based on the target ammonia injection amount.
Optionally, the road condition information at least includes a vehicle weight, a current vehicle speed, an uphill gradient, and a resistance coefficient, and the engine torque calculation unit includes:
and the engine torque calculation subunit is used for calculating the engine torque required by the vehicle on the uphill slope under the condition that the vehicle keeps the current vehicle speed unchanged by the engine of the vehicle according to the vehicle weight, the current vehicle speed, the uphill slope and the resistance coefficient.
Optionally, the system further includes:
the judging unit is used for judging whether the torque of the engine is larger than the torque indicated by the preset road condition requirement;
the first determining unit is used for determining that the engine torque meets the preset road condition requirement if the engine torque is larger than the torque indicated by the preset road condition requirement;
and the second determining unit is used for determining that the engine torque does not meet the preset road condition requirement if the engine torque is not greater than the torque indicated by the preset road condition requirement, controlling the vehicle to downshift and acquiring the current rotating speed of the engine.
Optionally, the first correcting unit includes:
a current exhaust temperature acquisition unit for acquiring a current exhaust temperature of the engine;
the first correction coefficient determining unit is used for calculating the difference between the current exhaust temperature of the engine and the target exhaust temperature and determining a first correction coefficient according to the difference between the current exhaust temperature of the engine and the target exhaust temperature;
and the first correction subunit is used for correcting the basic value of the ammonia injection correction based on the first correction coefficient to obtain a first ammonia injection amount.
The invention provides an ammonia injection amount control method and system of an SCR system, when the road condition in front of a vehicle is detected to be an uphill working condition, road condition information of the vehicle is obtained; according to the road condition information, calculating the engine torque required by the vehicle to ascend a slope under the condition that the current speed of the vehicle is kept unchanged; if the torque of the engine meets the requirement of a preset road condition, controlling the vehicle to maintain the current gear and acquiring the current rotating speed of the engine; determining a target exhaust temperature of the engine according to the engine torque and the current rotating speed of the engine; acquiring the gradient and the length of an uphill working condition, and calculating a correction distance according to the gradient and the length; determining a base value for ammonia injection correction based on the correction distance and the target exhaust temperature; acquiring the current exhaust temperature of the engine, and correcting the basic value of ammonia injection correction based on the target exhaust temperature and the current exhaust temperature of the engine to obtain a first ammonia injection amount; acquiring the current airspeed and the actual ammonia value of the engine, and correcting the first ammonia injection quantity based on the current airspeed, the target exhaust temperature and the actual ammonia storage quantity to obtain a second ammonia injection quantity; acquiring the current SCR treatment efficiency of the SCR system, and correcting the second ammonia injection amount based on the current SCR treatment efficiency to obtain a third ammonia injection amount; and acquiring the current ammonia injection amount of the SCR system, determining a target ammonia injection amount according to the third ammonia injection amount and the current ammonia injection amount, and controlling the SCR system to inject corresponding ammonia based on the target ammonia injection amount. According to the technical scheme provided by the invention, when the road condition in front of the vehicle is detected to be an uphill working condition, the running road condition of the engine is judged in advance according to the road condition information, and the ammonia injection amount of the SCR system is adjusted according to the relevant running parameters of the engine and the whole vehicle and the current processing efficiency of the SCR system, so that the processing efficiency of the SCR system can be ensured, and ammonia leakage can be effectively prevented.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic flow chart illustrating a method for controlling ammonia injection amount of an SCR system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an embodiment of the present invention for adjusting the ammonia injection amount of the SCR system according to the related operating parameters of the engine and the vehicle and the current processing efficiency of the SCR system;
fig. 3 is a schematic structural diagram of an ammonia injection amount control system of an SCR system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The term "include" and variations thereof as used herein are open-ended, i.e., "including but not limited to". The term "based on" is "based, at least in part, on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". Relevant definitions for other terms will be given in the following description.
It should be noted that the terms "first", "second", and the like in the present disclosure are only used for distinguishing different devices, modules or units, and are not used for limiting the order or interdependence of the functions performed by the devices, modules or units.
It is noted that references to "a", "an", and "the" modifications in the disclosure are exemplary rather than limiting, and that those skilled in the art will understand that "one or more" unless the context clearly dictates otherwise.
Referring to fig. 1, a schematic flow chart of an ammonia injection amount control method of an SCR system according to an embodiment of the present invention is shown, where the ammonia injection amount control method of the SCR system specifically includes the following steps:
s101: and when the road condition in front of the vehicle is detected to be an uphill working condition, acquiring the road condition information of the vehicle.
In the specific implementation of step S101, the road condition in front of the vehicle is detected in real time during the driving of the vehicle, and when it is detected that the road condition in front of the vehicle is an uphill road condition, the road condition information of the vehicle can be acquired.
In the embodiment of the present application, the road condition information of the vehicle includes the vehicle weight, the current vehicle speed of the vehicle, the uphill gradient, the resistance coefficient, and the engine characteristic.
S102: and calculating the engine torque required by the vehicle to ascend on a slope under the condition that the current speed of the vehicle is kept unchanged by the engine of the vehicle according to the road condition information.
In the specific execution process of step S102, after the road condition information of the vehicle is obtained, the engine torque required when the vehicle ascends the slope under the condition that the vehicle keeps the current vehicle speed unchanged by the engine of the vehicle may be calculated according to the vehicle weight, the current vehicle speed of the vehicle, the uphill gradient, and the resistance coefficient in the road condition information.
S103: judging whether the torque of the engine is larger than the torque indicated by the preset road condition requirement; if the engine torque is larger than the torque indicated by the preset road condition requirement, executing the step S104; if the engine torque is not greater than the torque indicated by the preset road condition requirement, step S105 is executed.
In the specific execution of step S103, after the engine torque required when the vehicle is ascending a slope is calculated, it is possible to determine whether or not a downshift is required when the vehicle is ascending a slope, based on the engine torque.
Specifically, the calculated engine torque is compared with the torque indicated by the preset road condition requirement, and if the engine torque is greater than the torque indicated by the preset road condition requirement, it is determined that the engine torque meets the preset road condition requirement, that is, the vehicle does not need to downshift when ascending, the vehicle is controlled to maintain the current gear, and step S104 is executed.
And if the engine torque is not greater than the torque indicated by the preset road condition requirement, determining that the engine torque does not meet the preset torque requirement, namely the torque is required when the vehicle goes up a slope, controlling the vehicle to downshift, and executing the step S105.
S104: and determining that the torque of the engine meets the requirement of a preset road condition, and controlling the vehicle to maintain the current gear.
S105: and determining that the torque of the engine does not meet the requirement of the preset road condition, and controlling the vehicle to downshift.
In the specific execution process of step S105, when it is determined that the engine torque is not greater than the torque indicated by the preset road condition requirement, it is determined that the engine torque does not satisfy the preset torque requirement, that is, the vehicle needs torque when ascending a slope, and the vehicle is controlled to downshift.
In real time, if the engine torque is a little less than the torque indicated by the preset road condition requirement, the vehicle can be controlled to descend to a gear, and the judgment is carried out again after the gear is descended, namely, the step S103 is executed again until the engine torque is determined to meet the preset road condition requirement, and the final gear is determined.
The above is only one preferable mode when the vehicle performs a downshift, and the inventor can set the downshift according to practical situations, and the embodiment of the present invention is not limited thereto, regarding how many shifts the vehicle needs to downshift.
S106: the current rotating speed of the engine is obtained.
In the specific implementation of step S106, after determining the gear required when the vehicle is ascending a slope, the current rotation speed of the engine may be further adjusted, so as to adjust the ammonia injection amount of the SCR system according to the engine, the relevant operating parameters of the entire vehicle and the current treatment efficiency of the SCR system. A strategy diagram for adjusting the ammonia injection amount of the SCR system according to the relevant operating parameters of the engine and the whole vehicle and the current processing efficiency of the SCR system is shown in fig. 2, and specific implementation procedures can be seen in steps S107 to S113 shown below.
S107: a target exhaust temperature of the engine is determined based on the engine torque and a current speed of the engine.
In the real-time application, after the current rotating speed of the engine is obtained, the target exhaust temperature Temp _ target of the engine can be determined according to the torque of the engine and the current rotating speed of the engine and by combining with the characteristic MAP calibrated by the engine.
S108: and acquiring the gradient and the length of the uphill working condition, and calculating the correction distance according to the gradient and the length.
After the gradient and the length of the uphill condition are obtained in the specific execution of step S108, as can be seen from the strategy diagram shown in fig. 2, the correction distance may be calculated according to the obtained gradient GPS _ stopplil and the length GPS _ slop, in combination with the engine calibration characteristic MAP (NH3injBase _ MAP 1).
It is noted that, with this correction distance, it is possible to effectively filter fluctuations in the correction coefficient involved in correcting the ammonia injection amount due to a smaller gradient and a smaller length.
S109: a base value for the ammonia injection correction is determined based on the correction distance and the target exhaust temperature.
In the specific implementation of step S109, after calculating the corresponding correction distance based on the gradient length, from the strategy diagram shown in fig. 2, the base value of the ammonia injection correction may be determined further based on the calculated correction distance and the determined target exhaust temperature, in combination with the engine calibrated MAP (NH3injBase _ MAP).
S110: the current exhaust temperature of the engine is acquired, and the base value of ammonia injection correction is corrected based on the target exhaust temperature and the current exhaust temperature of the engine to obtain a first ammonia injection amount.
In the specific execution of step S110, after the basic value of the ammonia injection correction is determined, as can be seen from the strategy diagram shown in fig. 2, the current exhaust temperature Temp _ now of the engine may be obtained, and the difference Delt _ t between the current exhaust temperature Temp _ now of the engine and the target exhaust temperature Temp _ target is calculated; according to the difference Delt _ t and a preset exhaust temperature correction coefficient curve Temp _ CUR, a correction coefficient corresponding to the difference Delt _ t is determined (for convenience of distinguishing, the correction coefficient corresponding to the difference Delt _ t is called a first correction coefficient), and further, a basic value of ammonia injection correction can be corrected according to the first correction coefficient to obtain a first ammonia injection amount.
S111: and acquiring the current airspeed and the actual ammonia storage value of the engine, and correcting the first ammonia injection amount based on the current airspeed, the target exhaust temperature and the actual ammonia storage amount to obtain a second ammonia injection amount.
In the specific implementation of step S111, as can be seen from the strategy diagram shown in fig. 2, the target ammonia stored value NH3Stor _ target may be determined by obtaining the current airspeed SV _ extra of the engine and combining the calibrated characteristic MAP (NH3Stor _ MAP) of the engine according to the current airspeed SV _ extra and the target exhaust temperature Temp _ target; acquiring actual ammonia value stored NH3Stor _ actual, calculating a difference Delt _ NH3Stor between a target ammonia value stored NH3Stor _ target and the actual ammonia value stored NH3Stor _ actual, determining a correction coefficient corresponding to the difference Delt _ NH3Stor according to the difference Delt _ NH3Stor and a preset ammonia value stored value correction coefficient curve NH3Stor _ CUR (for convenience of distinguishing, the correction coefficient corresponding to the difference Delt _ NH3Stor is called a second correction coefficient), and further correcting the first ammonia injection amount according to the second correction coefficient to obtain a second ammonia injection amount.
S112: and acquiring the current SCR treatment efficiency of the SCR system, and correcting the second ammonia injection amount based on the current SCR treatment efficiency to obtain a third ammonia injection amount.
In the specific process of executing step S112, it can be known from the strategy diagram shown in fig. 2 that the current SCR processing efficiency SCR _ efficiency of the SCR system is obtained, and a correction coefficient corresponding to the current SCR processing efficiency SCR _ efficiency is determined according to the current SCR processing efficiency SCR _ efficiency and a preset SCR processing efficiency correction coefficient curve scref _ CUR (for convenience of distinguishing, the correction coefficient corresponding to the current SCR processing efficiency SCR _ efficiency is referred to as a third correction coefficient), so that the second ammonia injection amount can be corrected according to the third correction coefficient to obtain a third ammonia injection amount.
It should be noted that although the ammonia injection amount can be reduced by continuously correcting the basic value for ammonia injection correction, if the ammonia injection amount is too small, the SCR treatment efficiency of the SCR may be reduced, and the SCR treatment efficiency of the SCR system may be ensured by correcting the second ammonia injection amount based on the current SCR treatment efficiency.
S113: and acquiring the current ammonia injection amount of the SCR system, determining a target ammonia injection amount according to the third ammonia injection amount and the current ammonia injection amount, and controlling the SCR system to inject corresponding ammonia based on the target ammonia injection amount.
In the specific process of executing step S113, as can be seen from the strategy diagram shown in fig. 2, when it is detected that the switch state is 1, the current ammonia injection amount ScrMgr _ MfNh3Raw of the SCR system is acquired, and the third ammonia injection amount is corrected by using the current ammonia injection amount ScrMgr _ MfNh3Raw of the SCR system, so that the target ammonia injection amount is obtained.
The invention provides an ammonia injection amount control method of an SCR system, which comprises the steps of acquiring road condition information of a vehicle when the road condition in front of the vehicle is detected to be an uphill working condition; according to the road condition information, calculating the engine torque required by the vehicle to ascend a slope under the condition that the current speed of the vehicle is kept unchanged; if the torque of the engine meets the requirement of a preset road condition, controlling the vehicle to maintain the current gear, if the torque of the engine is larger than the torque indicated by the requirement of the preset road condition, determining that the torque of the engine does not meet the requirement of the preset road condition, and controlling the vehicle to downshift; acquiring the current rotating speed of the engine; determining a target exhaust temperature of the engine according to the engine torque and the current rotating speed of the engine; acquiring the gradient and the length of an uphill working condition, and calculating a correction distance according to the gradient and the length; determining a base value for ammonia injection correction based on the correction distance and the target exhaust temperature; acquiring the current exhaust temperature of the engine, and correcting the basic value of ammonia injection correction based on the target exhaust temperature and the current exhaust temperature of the engine to obtain a first ammonia injection amount; acquiring the current airspeed and the actual ammonia storage value of the engine, and correcting the first ammonia injection amount based on the current airspeed, the target exhaust temperature and the actual ammonia storage amount to obtain a second ammonia injection amount; acquiring the current SCR treatment efficiency of the SCR system, and correcting the second ammonia injection amount based on the current SCR treatment efficiency to obtain a third ammonia injection amount; and acquiring the current ammonia injection amount of the SCR system, determining a target ammonia injection amount according to the third ammonia injection amount and the current ammonia injection amount, and controlling the SCR system to inject corresponding ammonia based on the target ammonia injection amount. According to the technical scheme provided by the invention, when the road condition in front of the vehicle is detected to be an uphill working condition, the current gear or the gear reduction is required to be maintained when the vehicle goes uphill subsequently by prejudging the running road condition of the engine according to the road condition information; the ammonia injection amount of the SCR system can be adjusted according to the relevant operating parameters of the engine and the whole vehicle and the current treatment efficiency of the SCR system, so that the treatment efficiency of the SCR system can be ensured, and ammonia leakage can be effectively prevented.
Based on the ammonia injection amount control method of the SCR system disclosed in the embodiment of the present application, the embodiment of the present invention also discloses an ammonia injection amount control system of the SCR system correspondingly, as shown in fig. 3, the ammonia injection amount control system of the SCR system includes:
a road condition information obtaining unit 31, configured to obtain road condition information of the vehicle when it is detected that a road condition in front of the vehicle is an uphill condition;
the engine torque calculation unit 32 is configured to calculate an engine torque required by the vehicle to ascend according to the road condition information, where the vehicle speed of the engine of the vehicle is kept unchanged;
the gear maintaining unit 33 is used for controlling the vehicle to maintain the current gear and acquiring the current rotating speed of the engine if the torque of the engine meets the requirement of a preset road condition;
a target exhaust temperature determination unit 34 for determining a target exhaust temperature of the engine based on the engine torque and the current rotation speed of the engine;
a corrected distance calculating unit 35, configured to obtain a gradient and a length of an uphill condition, and calculate a corrected distance according to the gradient and the length;
an ammonia injection amount correction base value determination unit 36 for determining a base value of ammonia injection correction based on the correction distance and the target exhaust gas temperature;
a first correction unit 37, configured to obtain a current exhaust temperature of the engine, and correct a basic value of ammonia injection correction based on the target exhaust temperature and the current exhaust temperature of the engine, so as to obtain a first ammonia injection amount;
the second correction unit 38 is used for acquiring the current airspeed and the actual ammonia storage value of the engine, and correcting the first ammonia injection amount based on the current airspeed, the target exhaust temperature and the actual ammonia storage amount to obtain a second ammonia injection amount;
a third correction unit 39, configured to obtain a current SCR processing efficiency of the SCR system, and correct the second ammonia injection amount based on the current SCR processing efficiency to obtain a third ammonia injection amount;
and the target ammonia injection amount determining unit 40 is used for obtaining the current ammonia injection amount of the SCR system, determining the target ammonia injection amount according to the third ammonia injection amount and the current ammonia injection amount, and controlling the SCR system to inject the corresponding ammonia based on the target ammonia injection amount.
The specific principle and implementation process of each unit in the ammonia injection amount control system of the SCR system disclosed in the above embodiment of the present invention are the same as those of the ammonia injection amount control method of the SCR system disclosed in the above embodiment of the present invention, and reference may be made to corresponding parts in the ammonia injection amount control method of the SCR system disclosed in the above embodiment of the present invention, and details are not repeated here.
The invention provides an ammonia injection amount control system of an SCR system, which is used for acquiring road condition information of a vehicle when detecting that the road condition in front of the vehicle is an uphill working condition; according to the road condition information, calculating the engine torque required by the vehicle to ascend a slope under the condition that the current speed of the vehicle is kept unchanged; if the torque of the engine meets the requirement of a preset road condition, controlling the vehicle to maintain the current gear and acquiring the current rotating speed of the engine; determining a target exhaust temperature of the engine according to the engine torque and the current rotating speed of the engine; acquiring the gradient and the length of an uphill working condition, and calculating a correction distance according to the gradient and the length; determining a base value for ammonia injection correction based on the correction distance and the target exhaust temperature; acquiring the current exhaust temperature of the engine, and correcting the basic value of ammonia injection correction based on the target exhaust temperature and the current exhaust temperature of the engine to obtain a first ammonia injection amount; acquiring the current airspeed and the actual ammonia storage value of the engine, and correcting the first ammonia injection amount based on the current airspeed, the target exhaust temperature and the actual ammonia storage amount to obtain a second ammonia injection amount; acquiring the current SCR treatment efficiency of the SCR system, and correcting the second ammonia injection amount based on the current SCR treatment efficiency to obtain a third ammonia injection amount; and acquiring the current ammonia injection amount of the SCR system, determining a target ammonia injection amount according to the third ammonia injection amount and the current ammonia injection amount, and controlling the SCR system to inject corresponding ammonia based on the target ammonia injection amount. According to the technical scheme provided by the invention, when the road condition in front of the vehicle is detected to be an uphill working condition, the running road condition of the engine is judged in advance according to the road condition information, and the ammonia injection amount of the SCR system is adjusted according to the relevant running parameters of the engine and the whole vehicle and the current processing efficiency of the SCR system, so that the processing efficiency of the SCR system can be ensured, and ammonia leakage can be effectively prevented.
Optionally, the road condition information at least includes a vehicle weight, a current vehicle speed, an uphill gradient, and a resistance coefficient, and the engine torque calculation unit includes:
and the engine torque calculation subunit is used for calculating the engine torque required by the vehicle to ascend the slope under the condition that the vehicle keeps the current vehicle speed unchanged according to the vehicle weight, the current vehicle speed, the ascending slope and the resistance coefficient.
Optionally, the ammonia injection amount control system of the SCR system provided by the present invention further includes:
the judging unit is used for judging whether the torque of the engine is larger than the torque indicated by the preset road condition requirement;
the first determining unit is used for determining that the torque of the engine meets the preset road condition requirement if the torque of the engine is larger than the torque indicated by the preset road condition requirement;
and the second determining unit is used for determining that the engine torque does not meet the preset road condition requirement if the engine torque is not greater than the torque indicated by the preset road condition requirement, controlling the vehicle to downshift and acquiring the current rotating speed of the engine.
Optionally, the first modification unit includes:
a current exhaust temperature acquisition unit for acquiring a current exhaust temperature of the engine;
the first correction coefficient determining unit is used for calculating the difference value between the current exhaust temperature of the engine and the target exhaust temperature and determining a first correction coefficient according to the difference value between the current exhaust temperature of the engine and the target exhaust temperature;
and a first correction subunit, configured to correct the basic value of the ammonia injection correction based on the first correction coefficient, so as to obtain a first ammonia injection amount.
Optionally, the second correction unit includes;
the air speed and ammonia value acquisition unit is used for acquiring the current air speed and the actual ammonia value of the engine;
the target ammonia value determining unit is used for determining a target ammonia value according to the current airspeed and the target exhaust temperature;
and the second correction subunit is used for determining a second correction coefficient according to the actual ammonia value and the target ammonia value, and correcting the first ammonia injection amount based on the second correction coefficient to obtain a second ammonia injection amount.
Optionally, the third modifying unit includes:
the SCR processing efficiency acquisition unit is used for acquiring the current SCR processing efficiency of the SCR system;
and the third correction subunit is used for determining a third correction coefficient according to the current SCR treatment efficiency and correcting the second ammonia injection amount based on the third correction coefficient to obtain a third ammonia injection amount.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are merely illustrative, wherein units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.
Claims (10)
1. A method of controlling ammonia injection amount of an SCR system, the method comprising:
when the road condition in front of the vehicle is detected to be an uphill working condition, acquiring road condition information of the vehicle;
according to the road condition information, calculating the engine torque required by the vehicle for climbing a slope under the condition that the vehicle keeps the current speed unchanged;
if the torque of the engine meets the requirement of a preset road condition, controlling the vehicle to maintain the current gear and acquiring the current rotating speed of the engine;
determining a target exhaust temperature of the engine based on the engine torque and a current speed of the engine;
acquiring the gradient and the length of the uphill working condition, and calculating a correction distance according to the gradient and the length;
determining a base value for the ammonia injection correction based on the correction distance and the target exhaust temperature;
acquiring the current exhaust temperature of the engine, and correcting the basic value of ammonia injection correction based on the target exhaust temperature and the current exhaust temperature of the engine to obtain a first ammonia injection amount;
acquiring the current airspeed and the actual ammonia storage value of the engine, and correcting the first ammonia injection amount based on the current airspeed, the target exhaust temperature and the actual ammonia storage amount to obtain a second ammonia injection amount;
acquiring the current SCR treatment efficiency of an SCR system, and correcting the second ammonia injection amount based on the current SCR treatment efficiency to obtain a third ammonia injection amount;
and acquiring the current ammonia injection amount of the SCR system, determining a target ammonia injection amount according to the third ammonia injection amount and the current ammonia injection amount, and controlling the SCR system to inject corresponding ammonia based on the target ammonia injection amount.
2. The method according to claim 1, wherein the road condition information at least comprises a vehicle weight, a current vehicle speed, an uphill gradient, and a resistance coefficient, and the calculating an engine torque required by an engine of the vehicle to uphill gradient while the vehicle keeps the current vehicle speed according to the road condition information comprises:
and calculating the engine torque required by the vehicle to ascend the slope under the condition that the vehicle keeps the current vehicle speed unchanged by the engine of the vehicle according to the vehicle weight, the current vehicle speed, the ascending slope and the resistance coefficient.
3. The method of claim 1, further comprising:
judging whether the torque of the engine is larger than the torque indicated by the preset road condition requirement;
if the engine torque is larger than the torque indicated by the preset road condition requirement, determining that the engine torque meets the preset road condition requirement;
and if the engine torque is not greater than the torque indicated by the preset road condition requirement, determining that the engine torque does not meet the preset road condition requirement, controlling the vehicle to downshift, and returning to execute judgment to determine whether the engine torque is greater than the torque indicated by the preset road condition requirement.
4. The method of claim 1, wherein the obtaining a current exhaust temperature of the engine and correcting the base value of the ammonia injection correction based on the target exhaust temperature and the current exhaust temperature of the engine to obtain a first ammonia injection amount comprises:
acquiring the current exhaust temperature of the engine;
calculating the difference value between the current exhaust temperature of the engine and the target exhaust temperature, and determining a first correction coefficient according to the difference value between the current exhaust temperature of the engine and the target exhaust temperature;
and correcting the basic value of the ammonia injection correction based on the first correction coefficient to obtain a first ammonia injection amount.
5. The method of claim 1, wherein the obtaining a current space velocity of the engine and an actual ammonia storage value and modifying the first ammonia injection amount based on the current space velocity, the target exhaust temperature, and the actual ammonia storage amount results in a second ammonia injection amount;
obtaining a current airspeed and an actual ammonia stored value of the engine;
determining a target ammonia value based on a current airspeed and the target exhaust temperature;
and determining a second correction coefficient according to the actual ammonia stored value and the target ammonia stored value, and correcting the first ammonia injection amount based on the second correction coefficient to obtain a second ammonia injection amount.
6. The method of claim 1, wherein obtaining a current SCR treatment efficiency of an SCR system and correcting the second ammonia injection amount based on the current SCR treatment efficiency to obtain a third ammonia injection amount comprises:
acquiring the current SCR treatment efficiency of an SCR system;
and determining a third correction coefficient according to the current SCR treatment efficiency, and correcting the second ammonia injection amount based on the third correction coefficient to obtain a third ammonia injection amount.
7. An ammonia injection amount control system of an SCR system, the system comprising:
the road condition information acquisition unit is used for acquiring the road condition information of the vehicle when the road condition in front of the vehicle is detected to be an uphill working condition;
the engine torque calculation unit is used for calculating the engine torque required by the vehicle for climbing uphill under the condition that the vehicle keeps the current speed unchanged according to the road condition information;
the gear maintaining unit is used for controlling the vehicle to maintain a current gear and acquiring the current rotating speed of the engine if the torque of the engine meets the requirement of a preset road condition;
a target exhaust temperature determination unit for determining a target exhaust temperature of the engine based on the engine torque and a current rotation speed of the engine;
the correction distance calculation unit is used for acquiring the gradient and the length of the uphill working condition and calculating a correction distance according to the gradient and the length;
an ammonia injection amount correction base value determination unit configured to determine a base value of the ammonia injection correction based on the correction distance and the target exhaust gas temperature;
the first correction unit is used for acquiring the current exhaust temperature of the engine and correcting the basic value of the ammonia injection correction based on the target exhaust temperature and the current exhaust temperature of the engine to obtain a first ammonia injection amount;
the second correction unit is used for acquiring the current airspeed and the actual ammonia storage value of the engine, and correcting the first ammonia injection amount based on the current airspeed, the target exhaust temperature and the actual ammonia storage amount to obtain a second ammonia injection amount;
the third correction unit is used for acquiring the current SCR treatment efficiency of the SCR system and correcting the second ammonia injection amount based on the current SCR treatment efficiency to obtain a third ammonia injection amount;
and the target ammonia injection amount determining unit is used for acquiring the current ammonia injection amount of the SCR system, determining the target ammonia injection amount according to the third ammonia injection amount and the current ammonia injection amount, and controlling the SCR system to inject the corresponding ammonia based on the target ammonia injection amount.
8. The system of claim 7, wherein the road condition information includes at least a vehicle weight, a current vehicle speed, an uphill gradient, and a drag coefficient, and the engine torque calculation unit includes:
and the engine torque calculation subunit is used for calculating the engine torque required by the vehicle on the uphill slope under the condition that the vehicle keeps the current vehicle speed unchanged by the engine of the vehicle according to the vehicle weight, the current vehicle speed, the uphill slope and the resistance coefficient.
9. The system of claim 7, further comprising:
the judging unit is used for judging whether the engine torque is larger than the torque indicated by the preset road condition requirement;
the first determining unit is used for determining that the engine torque meets the preset road condition requirement if the engine torque is larger than the torque indicated by the preset road condition requirement;
and the second determining unit is used for determining that the engine torque does not meet the preset road condition requirement if the engine torque is not greater than the torque indicated by the preset road condition requirement, controlling the vehicle to downshift and acquiring the current rotating speed of the engine.
10. The system of claim 7, wherein the first modification unit comprises:
a current exhaust temperature acquisition unit for acquiring a current exhaust temperature of the engine;
the first correction coefficient determining unit is used for calculating the difference value between the current exhaust temperature of the engine and the target exhaust temperature and determining a first correction coefficient according to the difference value between the current exhaust temperature of the engine and the target exhaust temperature;
and the first correction subunit is used for correcting the basic value of the ammonia injection correction based on the first correction coefficient to obtain a first ammonia injection amount.
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