CN114961933B - Ammonia injection quantity control method and system of SCR system - Google Patents

Ammonia injection quantity control method and system of SCR system Download PDF

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Publication number
CN114961933B
CN114961933B CN202210509753.XA CN202210509753A CN114961933B CN 114961933 B CN114961933 B CN 114961933B CN 202210509753 A CN202210509753 A CN 202210509753A CN 114961933 B CN114961933 B CN 114961933B
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current
ammonia injection
engine
vehicle
injection amount
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CN114961933A (en
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陈火雷
李云华
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Weichai Power Co Ltd
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Weichai Power Co Ltd
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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
    • 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
    • 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
    • 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)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

The application provides an ammonia injection quantity control method and system of an SCR system, when detecting that the road condition in front of a vehicle is an uphill condition, calculating the torque required by the uphill under the condition that the vehicle keeps the current speed of the engine according to road condition information; if the torque meets the requirement of the 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 the correction distance calculated according to the gradient and the length of the uphill working condition; 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 based on the current airspeed, the target exhaust temperature and the actual ammonia storage value, 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 the target ammonia injection amount determined from the third ammonia injection amount and the current ammonia injection amount.

Description

Ammonia injection quantity control method and system of SCR system
Technical Field
The application relates to the technical field of vehicle aftertreatment, in particular to an ammonia injection quantity control method and system of an SCR system.
Background
With the widespread use of vehicles, the conversion efficiency of selective catalytic reduction (Slective Catalyst Reduction, SCR) systems is increasingly demanded. In order to meet the conversion efficiency requirements of an SCR system, the SCR system needs to have sufficient ammonia storage to participate in the reaction.
The current SCR system ammonia consists of two parts, namely SCR ammonia storage and real-time injection urea quantity. However, as the SCR system increases with the exhaust temperature of the engine, the ammonia reserves may significantly decrease; when the road condition in front of the vehicle is an uphill road condition, the load of the engine tends to increase suddenly, and when the load of the engine increases 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 increases, so as to avoid ammonia leakage, is a problem that needs to be solved in the present application.
Disclosure of Invention
In view of the above, the present application provides a method and a system for controlling ammonia injection amount of an SCR system, so as to solve the problem of ammonia leakage caused by high temperature rise of an engine exhaust due to sudden load increase of the engine when the road condition in front of a vehicle is an uphill road condition in the prior art.
The first aspect of the application discloses an ammonia injection amount control method of an SCR system, which comprises the following steps:
when the road condition in front of the vehicle is detected to be an uphill condition, acquiring road condition information of the vehicle;
calculating the engine torque required by the vehicle on an uphill 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;
if the torque of the engine meets the requirement of a preset road condition, controlling the vehicle to maintain a 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 rotational 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 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 the ammonia injection correction based on the target exhaust temperature and the current exhaust temperature of the engine to obtain a first ammonia injection quantity;
acquiring a current airspeed and an 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 value 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 quantity of the SCR system, determining a target ammonia injection quantity according to the third ammonia injection quantity and the current ammonia injection quantity, and controlling the SCR system to inject corresponding ammonia based on the target ammonia injection quantity.
Optionally, the road condition information at least includes a vehicle weight, a current vehicle speed, an uphill gradient, and a resistance coefficient, and calculating, according to the road condition information, an engine torque required by the vehicle uphill under the condition that the vehicle keeps the current vehicle speed unchanged, where the engine torque required by the vehicle uphill includes:
and calculating the engine torque required by the vehicle on the uphill road under the condition that the current vehicle speed of the vehicle is kept unchanged according to the vehicle weight, the current vehicle speed, the uphill gradient and the resistance coefficient.
Optionally, the method further comprises:
judging whether the engine torque 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 demand, determining that the engine torque does not meet the preset road condition demand, controlling the vehicle to perform downshift, and returning to execute the judgment of whether the engine torque is greater than the torque indicated by the preset road condition demand.
Optionally, the obtaining 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 includes:
acquiring the current exhaust temperature of the engine;
calculating a difference between a 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 correcting the basic value of the ammonia injection correction based on the first correction coefficient to obtain a first ammonia injection quantity.
Optionally, the 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 value to obtain a second ammonia injection amount includes:
acquiring the current airspeed and the actual ammonia storage value of the engine;
determining a target ammonia storage value according to the current airspeed and the target exhaust temperature;
and determining a second correction coefficient according to the actual ammonia storage value and the target ammonia storage value, and correcting the first ammonia injection quantity based on the second correction coefficient to obtain a second ammonia injection quantity.
Optionally, the obtaining 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 includes:
acquiring the current SCR processing 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 application, an ammonia injection amount control system for 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 condition;
an engine torque calculation unit, configured to calculate, according to the road condition information, an engine torque required by the vehicle when the vehicle is ascending uphill, with the current vehicle speed of the vehicle kept unchanged;
the gear maintaining unit 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 the preset road condition;
a target exhaust gas temperature determination unit configured to determine a target exhaust gas temperature of the engine based on the engine torque and a current rotational speed of the engine;
the correction distance calculating 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;
a basic value determination unit for ammonia injection amount correction for determining a basic value of ammonia injection correction based on the correction distance and the target exhaust gas temperature;
a first correction unit, configured to obtain a current exhaust temperature of the engine, and correct a basic value of the 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 is used for acquiring the current airspeed and the actual ammonia storage value of the engine, correcting the first ammonia injection quantity based on the current airspeed, the target exhaust temperature and the actual ammonia storage value, and obtaining a second ammonia injection quantity;
the third correction unit is used for acquiring the current SCR treatment efficiency of the SCR system, correcting the second ammonia injection amount based on the current SCR treatment efficiency and obtaining 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 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 the engine torque calculating unit includes:
and the engine torque calculation subunit is used for calculating the engine torque required by the vehicle on the uphill according to the vehicle weight, the current vehicle speed, the uphill gradient and the resistance coefficient under the condition that the current vehicle speed of the vehicle is kept unchanged.
Optionally, the system further comprises:
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 perform downshift, and acquiring the current rotating speed of the engine.
Optionally, the first correction unit includes:
a current exhaust gas temperature acquisition unit configured to acquire a current exhaust gas temperature of the engine;
a first correction coefficient determining unit configured to calculate a difference between a current exhaust temperature of the engine and the target exhaust temperature, and determine 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 quantity.
The application provides an ammonia injection quantity control method and system of an SCR system, which are used for acquiring road condition information of a vehicle when the road condition in front of the vehicle is detected to be an uphill condition; calculating the engine torque required by the vehicle on the uphill under the condition that the current speed of the vehicle is kept unchanged according to the road condition information; if the torque of the engine meets the requirement of the 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 rotational 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 basic value of ammonia injection correction according to the correction distance and the target exhaust temperature; acquiring the current exhaust temperature of an 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 quantity; acquiring a current airspeed and an actual ammonia storage value of an engine, and correcting the first ammonia injection amount based on the current airspeed, a target exhaust temperature and the actual ammonia storage value 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 quantity of the SCR system, determining a target ammonia injection quantity according to the third ammonia injection quantity and the current ammonia injection quantity, and controlling the SCR system to inject corresponding ammonia based on the target ammonia injection quantity. According to the technical scheme provided by the application, when the road condition in front of the vehicle is detected to be an uphill condition, the running road condition of the engine is prejudged according to the road condition information, and the ammonia injection quantity of the SCR system is adjusted according to the running parameters related to 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.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present application, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of an ammonia injection amount control method of an SCR system according to an embodiment of the present application;
FIG. 2 is a schematic diagram of adjusting the ammonia injection amount of an SCR system according to the operation parameters related to an engine and a whole vehicle and the current treatment efficiency of the SCR system according to the embodiment of the present application;
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 application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The term "including" and variations thereof as used herein are intended to be 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. Related definitions of other terms will be given in the description below.
It should be noted that the terms "first," "second," and the like in this disclosure are merely used for distinguishing between different devices, modules, or units and not for limiting the order or interdependence of the functions performed by these devices, modules, or units.
It should be noted that references to "one" or "a plurality" in this disclosure are intended to be illustrative rather than limiting, and those of ordinary skill in the art will appreciate that "one or more" is intended to be interpreted as "one or more" unless the context clearly indicates otherwise.
Referring to fig. 1, a flow chart of an ammonia injection amount control method of an SCR system according to an embodiment of the present application 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 condition, acquiring the road condition information of the vehicle.
In the specific execution of step S101, during the running of the vehicle, the road condition in front of the vehicle is detected in real time, and when the road condition in front of the vehicle is detected as an uphill road condition, the road condition information of the vehicle can be obtained.
In the embodiment of the application, the road condition information of the vehicle comprises the weight of the vehicle, the current speed of the vehicle, the uphill gradient, the resistance coefficient and the engine characteristic.
S102: according to the road condition information, calculating the engine torque required by the vehicle on the uphill under the condition that the current speed of the vehicle is kept unchanged.
In the process of specifically executing step S102, after the road condition information of the vehicle is obtained, the engine torque required by the engine of the vehicle when the vehicle ascends the hill may be calculated according to the vehicle weight, the current vehicle speed, the ascending slope 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 greater than the torque indicated by the preset road condition demand, step S104 is executed; if the engine torque is not greater than the torque indicated by the preset road condition demand, step S105 is performed.
In the process of specifically executing step S103, after the engine torque required for the vehicle to ascend the slope is calculated, it may be determined whether or not a downshift is required for the vehicle to ascend the slope based on the engine torque.
Specifically, the calculated engine torque is compared with the torque indicated by the preset road condition demand, if the engine torque is greater than the torque indicated by the preset road condition demand, it is determined that the engine torque meets the preset road condition demand, 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.
If the engine torque is not greater than the torque indicated by the preset road condition demand, it is determined that the engine torque does not meet the preset torque demand, that is, the torque is required when the vehicle is ascending, the vehicle is controlled to perform a downshift, and step S105 is performed.
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 perform downshift.
In the process of specifically executing step S105, in the case where it is determined that the engine torque is not greater than the torque indicated by the preset road condition demand, it is determined that the engine torque does not meet the preset torque demand, that is, the torque is required when the vehicle is ascending an uphill, and the vehicle is controlled to perform a downshift.
In the real-time of the application, if the engine torque is less than the torque indicated by the preset road condition demand by a little, the vehicle can be controlled to shift down by one gear, and judgment is carried out again after the gear is shifted down, namely, the step S103 is executed again until the engine torque is determined to meet the preset road condition demand, and the final gear is determined.
The above is only one preferable mode of the present application when the vehicle is downshifted, and the inventor can set how many gears are specifically needed when the vehicle is downshifted according to the actual situation, and the embodiments of the present application are not limited.
S106: the current rotational speed of the engine is obtained.
In the specific execution of step S106, after determining the gear required when the vehicle is ascending, the current rotation speed of the engine may be further increased, so as to adjust the ammonia injection amount of the SCR system according to the running parameters related to the engine and the whole vehicle and the current treatment efficiency of the SCR system. The strategy diagram for adjusting the ammonia injection amount of the SCR system according to the operation parameters related to the engine and the whole vehicle and the current treatment efficiency of the SCR system is shown in fig. 2, and the specific implementation process can be seen from step S107 to step S113 shown below.
S107: a target exhaust temperature of the engine is determined based on the engine torque and the current rotational speed of the engine.
In the 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 engine torque and the current rotating speed of the engine and by combining 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.
In the process of specifically executing step S108, after the gradient and length of the uphill condition are obtained, as can be seen from the strategy diagram shown in fig. 2, according to the obtained gradient gps_stopdis and length gps_loop, the correction distance can be calculated by combining the characteristic MAP (NH 3 injbase_map1) of the engine calibration.
The correction distance can be used to effectively filter fluctuations in correction coefficients involved in correcting the ammonia injection amount due to a small gradient and a small length.
S109: and determining a basic value of ammonia injection correction according to the correction distance and the target exhaust temperature.
In the specific execution of step S109, after calculating the corresponding correction distance according to the slope-variable length, from the strategy chart shown in fig. 2, the base value of the ammonia injection correction may be determined by further combining the calculated correction distance and the determined target exhaust temperature with the engine calibrated characteristic MAP (NH 3 injbase_map).
S110: and 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 quantity.
In the process of specifically executing step S110, after determining the basic value of the ammonia injection correction, it can be known from the strategy diagram shown in fig. 2 that the current exhaust temperature temp_now of the engine can be obtained, and the difference value delt_t between the current exhaust temperature temp_now of the engine and the target exhaust temperature temp_target is calculated; and determining a correction coefficient corresponding to the difference Delt_t (for convenience of distinguishing, the correction coefficient corresponding to the difference Delt_t is called a first correction coefficient) according to the difference Delt_t and a preset exhaust temperature correction coefficient curve temp_CUR, and correcting the basic value of ammonia injection correction according to the first correction coefficient to obtain a first ammonia injection quantity.
S111: and acquiring the current airspeed and the actual ammonia storage 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 value to obtain a second ammonia injection quantity.
In the process of specifically executing step S111, as can be seen from the strategy diagram shown in fig. 2, the target ammonia storage value NH3stor_target can be determined by acquiring the current airspeed sv_extarget of the engine and combining the calibrated characteristic MAP (NH 3 stor_map) of the engine according to the current airspeed sv_extarget and the target exhaust temperature temp_target; the method comprises the steps of obtaining an actual ammonia storage value NH3Stor_actual, calculating a difference Delt_nh3Stor between a target ammonia storage value NH3Stor_target and the actual ammonia storage value NH3Stor_actual, and determining a correction coefficient corresponding to the difference Delt_nh3Stor according to the difference Delt_nh3Stor and a preset ammonia storage 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), so that the first ammonia injection quantity can be corrected according to the second correction coefficient, and a second ammonia injection quantity can be obtained.
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 execution of step S112, it can be known from the strategy diagram shown in fig. 2 that the current SCR processing efficiency scr_effciency of the SCR system is obtained, and the correction coefficient corresponding to the current SCR processing efficiency scr_effciency (for convenience of distinction, the correction coefficient corresponding to the current SCR processing efficiency scr_effciency is referred to as the third correction coefficient) is determined according to the current SCR processing efficiency scr_effciency and the preset SCR processing efficiency correction coefficient curve scruff_cur, so that the second ammonia injection amount can be corrected according to the third correction coefficient, and the third ammonia injection amount is obtained.
After the basic value of the ammonia injection correction is continuously corrected, the purpose of reducing the ammonia injection amount can be achieved, but if the ammonia injection amount is too small, the SCR treatment efficiency of the SCR is reduced, and further the second ammonia injection amount is corrected based on the current SCR treatment efficiency, so that the SCR treatment efficiency of the SCR system can be ensured.
S113: and acquiring the current ammonia injection quantity of the SCR system, determining a target ammonia injection quantity according to the third ammonia injection quantity and the current ammonia injection quantity, and controlling the SCR system to inject corresponding ammonia based on the target ammonia injection quantity.
In the specific execution of step S113, it is known from the strategy diagram shown in fig. 2 that when the on-off state is detected to be 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, to obtain the target ammonia injection amount.
The application provides an ammonia injection quantity control method 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 condition; calculating the engine torque required by the vehicle on the uphill under the condition that the current speed of the vehicle is kept unchanged according to the road condition information; if the engine torque meets the preset road condition requirement, controlling the vehicle to maintain the current gear, and if the engine torque is larger than the torque indicated by the preset road condition requirement, determining that the engine torque does not meet the preset road condition requirement, and controlling the vehicle to perform downshift; acquiring the current rotating speed of an engine; determining a target exhaust temperature of the engine according to the engine torque and the current rotational 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 basic value of ammonia injection correction according to the correction distance and the target exhaust temperature; acquiring the current exhaust temperature of an 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 quantity; acquiring a current airspeed and an actual ammonia storage value of an engine, and correcting the first ammonia injection amount based on the current airspeed, a target exhaust temperature and the actual ammonia storage value 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 quantity of the SCR system, determining a target ammonia injection quantity according to the third ammonia injection quantity and the current ammonia injection quantity, and controlling the SCR system to inject corresponding ammonia based on the target ammonia injection quantity. According to the technical scheme provided by the application, when the road condition in front of the vehicle is detected to be an uphill condition, the current gear or the downshift is required to be maintained when the vehicle is predicted to follow the uphill through the running road condition of the engine according to the road condition information; the ammonia injection quantity of the SCR system can be adjusted according to the related operation 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 application also correspondingly discloses an ammonia injection amount control system of the SCR system, as shown in fig. 3, where the ammonia injection amount control system of the SCR system includes:
the road condition information obtaining unit 31 is 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;
an engine torque calculation unit 32, configured to calculate an engine torque required for an uphill vehicle when the current vehicle speed of the vehicle is kept unchanged, according to the road condition information;
a gear maintaining unit 33, configured to control the vehicle to maintain the current gear and obtain the current rotation speed of the engine if the engine torque meets the preset road condition requirement;
a target exhaust gas temperature determination unit 34 for determining a target exhaust gas temperature of the engine based on the engine torque and the current rotational speed of the engine;
a correction distance calculating unit 35, configured to obtain a gradient and a length of an uphill condition, and calculate a correction distance according to the gradient and the length;
a basic value determination unit 36 for ammonia injection amount correction for determining a basic value of ammonia injection correction based on the correction distance and the target exhaust gas temperature;
a first correction unit 37 for acquiring a current exhaust temperature of the engine and 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;
a second correction unit 38 for acquiring a current airspeed and an 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 value to obtain a second ammonia injection amount;
a third correction unit 39, configured to obtain a current SCR treatment efficiency of the SCR system, and correct the second ammonia injection amount based on the current SCR treatment efficiency, so as to obtain a third ammonia injection amount;
a target ammonia injection amount determining unit 40, configured to obtain a current ammonia injection amount of the SCR system, determine a target ammonia injection amount according to the third ammonia injection amount and the current ammonia injection amount, and control the SCR system to inject the corresponding ammonia based on the target ammonia injection amount.
The specific principle and execution process of each unit in the ammonia injection amount control system of the SCR system disclosed in the above embodiment of the present application are the same as those of the ammonia injection amount control method of the SCR system disclosed in the above embodiment of the present application, and may refer to the corresponding parts in the ammonia injection amount control method of the SCR system disclosed in the above embodiment of the present application, and will not be described in detail here.
The application provides an ammonia injection quantity 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 condition; calculating the engine torque required by the vehicle on the uphill under the condition that the current speed of the vehicle is kept unchanged according to the road condition information; if the torque of the engine meets the requirement of the 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 rotational 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 basic value of ammonia injection correction according to the correction distance and the target exhaust temperature; acquiring the current exhaust temperature of an 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 quantity; acquiring a current airspeed and an actual ammonia storage value of an engine, and correcting the first ammonia injection amount based on the current airspeed, a target exhaust temperature and the actual ammonia storage value 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 quantity of the SCR system, determining a target ammonia injection quantity according to the third ammonia injection quantity and the current ammonia injection quantity, and controlling the SCR system to inject corresponding ammonia based on the target ammonia injection quantity. According to the technical scheme provided by the application, when the road condition in front of the vehicle is detected to be an uphill condition, the running road condition of the engine is prejudged according to the road condition information, and the ammonia injection quantity of the SCR system is adjusted according to the running parameters related to 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.
Optionally, the road condition information at least includes vehicle weight, current vehicle speed, uphill gradient, and 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 an uphill according to the vehicle weight, the current vehicle speed, the uphill gradient and the resistance coefficient under the condition that the current vehicle speed of the vehicle is kept unchanged.
Optionally, the ammonia injection amount control system of the SCR system provided by the present application 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 perform downshift and obtaining the current rotating speed of the engine.
Optionally, the first correction unit includes:
a current exhaust temperature acquisition unit configured to acquire a current exhaust temperature of an engine;
a first correction coefficient determining unit for calculating a difference between a current exhaust temperature of the engine and a 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 quantity.
Optionally, the second correction unit includes;
an airspeed and ammonia storage value acquisition unit for acquiring a current airspeed and an actual ammonia storage value of the engine;
a target ammonia storage value determining unit for determining a target ammonia storage 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 storage value and the target ammonia storage value, and correcting the first ammonia injection quantity based on the second correction coefficient to obtain a second ammonia injection quantity.
Optionally, the third correction 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 processing efficiency, and correcting the second ammonia injection quantity based on the third correction coefficient to obtain a third ammonia injection quantity.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for a system or system embodiment, since it is substantially similar to a method embodiment, the description is relatively simple, with reference to the description of the method embodiment being made in part. The systems and system embodiments described above are merely illustrative, wherein elements illustrated as separate elements may or may not be physically separate, and elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present application without undue burden.
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 elements and steps are described above generally in terms of functionality in order to clearly illustrate the 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 solution. 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 application.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. 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 application. Thus, the present application 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 merely a preferred embodiment of the present application and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present application, which are intended to be comprehended within the scope of the present application.

Claims (10)

1. A method for controlling an 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 condition, acquiring road condition information of the vehicle;
calculating the engine torque required by the vehicle on an uphill 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;
if the torque of the engine meets the requirement of a preset road condition, controlling the vehicle to maintain a 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 rotational 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 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 the ammonia injection correction based on the target exhaust temperature and the current exhaust temperature of the engine to obtain a first ammonia injection quantity;
acquiring a current airspeed and an 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 value 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 quantity of the SCR system, determining a target ammonia injection quantity according to the third ammonia injection quantity and the current ammonia injection quantity, and controlling the SCR system to inject corresponding ammonia based on the target ammonia injection quantity.
2. The method of claim 1, wherein the traffic information includes at least a vehicle weight, a current vehicle speed, an uphill gradient, and a drag coefficient, and wherein calculating an engine torque required by an engine of the vehicle uphill from the traffic information while the vehicle remains at the current vehicle speed comprises:
and calculating the engine torque required by the vehicle on the uphill road under the condition that the current vehicle speed of the vehicle is kept unchanged according to the vehicle weight, the current vehicle speed, the uphill gradient and the resistance coefficient.
3. The method according to claim 1, wherein the method further comprises:
judging whether the engine torque 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 demand, determining that the engine torque does not meet the preset road condition demand, controlling the vehicle to perform downshift, and returning to execute the judgment of whether the engine torque is greater than the torque indicated by the preset road condition demand.
4. The method of claim 1, wherein the obtaining the current exhaust temperature of the engine and correcting the ammonia injection corrected base value 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 a difference between a 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 correcting the basic value of the ammonia injection correction based on the first correction coefficient to obtain a first ammonia injection quantity.
5. The method of claim 1, wherein the obtaining the current airspeed and an 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 value to obtain a second ammonia injection amount includes:
acquiring the current airspeed and the actual ammonia storage value of the engine;
determining a target ammonia storage value according to the current airspeed and the target exhaust temperature;
and determining a second correction coefficient according to the actual ammonia storage value and the target ammonia storage value, and correcting the first ammonia injection quantity based on the second correction coefficient to obtain a second ammonia injection quantity.
6. The method of claim 1, wherein the obtaining 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 comprises:
acquiring the current SCR processing 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 condition;
an engine torque calculation unit, configured to calculate, according to the road condition information, an engine torque required by the vehicle when the vehicle is ascending uphill, with the current vehicle speed of the vehicle kept unchanged;
the gear maintaining unit 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 the preset road condition;
a target exhaust gas temperature determination unit configured to determine a target exhaust gas temperature of the engine based on the engine torque and a current rotational speed of the engine;
the correction distance calculating 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;
a basic value determination unit for ammonia injection amount correction for determining a basic value of ammonia injection correction based on the correction distance and the target exhaust gas temperature;
a first correction unit, configured to obtain a current exhaust temperature of the engine, and correct a basic value of the 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 is used for acquiring the current airspeed and the actual ammonia storage value of the engine, correcting the first ammonia injection quantity based on the current airspeed, the target exhaust temperature and the actual ammonia storage value, and obtaining a second ammonia injection quantity;
the third correction unit is used for acquiring the current SCR treatment efficiency of the SCR system, correcting the second ammonia injection amount based on the current SCR treatment efficiency and obtaining 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 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.
8. The system according to claim 7, wherein the road condition information includes at least a vehicle weight, a current vehicle speed, an upward gradient, and a resistance coefficient, 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 according to the vehicle weight, the current vehicle speed, the uphill gradient and the resistance coefficient under the condition that the current vehicle speed of the vehicle is kept unchanged.
9. The system of claim 7, wherein the system further comprises:
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 perform downshift, and acquiring the current rotating speed of the engine.
10. The system of claim 7, wherein the first correction unit comprises:
a current exhaust gas temperature acquisition unit configured to acquire a current exhaust gas temperature of the engine;
a first correction coefficient determining unit configured to calculate a difference between a current exhaust temperature of the engine and the target exhaust temperature, and determine 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 quantity.
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Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011024721A1 (en) * 2009-08-28 2011-03-03 本田技研工業株式会社 Exhaust gas purification device for internal combustion engine
CN103016112A (en) * 2012-12-18 2013-04-03 潍柴动力股份有限公司 Method and system for controlling emitted dose of urea solution by SCR (Selective Catalytic reduction)
WO2013147653A1 (en) * 2012-03-29 2013-10-03 Volvo Construction Equipment Ab Method for diagnosing a selective catalytic reduction catalyst
CN105604653A (en) * 2016-03-18 2016-05-25 安徽华菱汽车有限公司 Urea jet control method and device and SCR system
CN106837480A (en) * 2016-12-26 2017-06-13 潍柴动力股份有限公司 A kind of urea injecting quantity control method and post processing control system based on model
CN106837497A (en) * 2017-02-24 2017-06-13 天津大学 Diesel catalyst based on storage ammonia amount management in real time reduces method for urea injection control
KR20200032837A (en) * 2018-09-19 2020-03-27 현대자동차주식회사 Urea injection control method of selective catalytic reduction system
JP2020118077A (en) * 2019-01-23 2020-08-06 いすゞ自動車株式会社 Exhaust emission control device for internal combustion engine, and vehicle
CN112324547A (en) * 2020-10-31 2021-02-05 同济大学 Selective catalytic reduction control method and system suitable for mixed fuel
CN112360597A (en) * 2020-11-10 2021-02-12 潍柴动力股份有限公司 Anti-crystallization control method and device based on sulfur dioxide sensor
CN113266448A (en) * 2021-05-27 2021-08-17 潍柴动力股份有限公司 Control method and system for urea injection amount and vehicle

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9803532B2 (en) * 2015-07-28 2017-10-31 GM Global Technology Operations LLC Predictive control of ammonia storage in a selective catalytic reduction device using connectivity information
US9739190B2 (en) * 2015-11-12 2017-08-22 GM Global Technology Operations LLC Method and apparatus to control reductant injection into an exhaust gas feedstream

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011024721A1 (en) * 2009-08-28 2011-03-03 本田技研工業株式会社 Exhaust gas purification device for internal combustion engine
WO2013147653A1 (en) * 2012-03-29 2013-10-03 Volvo Construction Equipment Ab Method for diagnosing a selective catalytic reduction catalyst
CN103016112A (en) * 2012-12-18 2013-04-03 潍柴动力股份有限公司 Method and system for controlling emitted dose of urea solution by SCR (Selective Catalytic reduction)
CN105604653A (en) * 2016-03-18 2016-05-25 安徽华菱汽车有限公司 Urea jet control method and device and SCR system
CN106837480A (en) * 2016-12-26 2017-06-13 潍柴动力股份有限公司 A kind of urea injecting quantity control method and post processing control system based on model
CN106837497A (en) * 2017-02-24 2017-06-13 天津大学 Diesel catalyst based on storage ammonia amount management in real time reduces method for urea injection control
KR20200032837A (en) * 2018-09-19 2020-03-27 현대자동차주식회사 Urea injection control method of selective catalytic reduction system
JP2020118077A (en) * 2019-01-23 2020-08-06 いすゞ自動車株式会社 Exhaust emission control device for internal combustion engine, and vehicle
CN112324547A (en) * 2020-10-31 2021-02-05 同济大学 Selective catalytic reduction control method and system suitable for mixed fuel
CN112360597A (en) * 2020-11-10 2021-02-12 潍柴动力股份有限公司 Anti-crystallization control method and device based on sulfur dioxide sensor
CN113266448A (en) * 2021-05-27 2021-08-17 潍柴动力股份有限公司 Control method and system for urea injection amount and vehicle

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
尿素SCR催化反应中气态氨供给速率计算方法研究;李军等;《内燃机工程》;第38卷(第5期);第41-46页 *

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