CN111456836A - Method and device for reducing exhaust emission of engine - Google Patents
Method and device for reducing exhaust emission of engine Download PDFInfo
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- CN111456836A CN111456836A CN201910060115.2A CN201910060115A CN111456836A CN 111456836 A CN111456836 A CN 111456836A CN 201910060115 A CN201910060115 A CN 201910060115A CN 111456836 A CN111456836 A CN 111456836A
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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
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
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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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
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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
- F01N3/101—Three-way catalysts
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Exhaust Gas After Treatment (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
Abstract
The application discloses a method for reducing exhaust emission of an engine, which is applied to an EMS system and comprises the following steps: and detecting an engine running state and a vehicle running state, and starting a emission reduction strategy for discharging residual gas pollutants in the engine when the engine running state represents that the engine is in an idling state and the vehicle running state represents that the vehicle is in a stopping state. The application provides a method for reducing engine exhaust emission focuses on the gas pollutant that reduces remaining in the jar when the engine shuts down with the focus, make full use of shut down back ternary catalyst temperature is higher, still can carry out catalytic conversion's advantage effectively, discharge the residual gas pollutant in the engine jar with harmless gaseous form promptly, and then discharge a large amount of harmful gas when avoiding the vehicle cold start once more effectively, also be favorable to reducing the machine oil dilution phenomenon of engine simultaneously.
Description
Technical Field
The present application relates to the field of internal combustion engine technology, and more particularly, to a method and apparatus for reducing exhaust emissions from an engine.
Background
During the cold start and warm-up processes of the gasoline engine, the throttle valve of the engine is usually small in opening degree, at the moment, the air inlet speed and the temperature in the engine are low, gasoline cannot be sufficiently atomized, the evaporation effect is poor, and therefore the gasoline and air are difficult to be sufficiently mixed to form uniform combustible mixed gas. Meanwhile, the concentration of the residual exhaust gas in the engine cylinder is high, the temperature of the combustion chamber is low, and under the condition that enough combustible mixed gas is not generated, the engine cannot stably burn, namely abnormal combustion occurs, and further a large amount of harmful gas which is not completely burned is generated, and the exhaust temperature at the moment does not reach the ignition temperature of a three-way catalyst installed on a vehicle exhaust system, so that the three-way catalyst cannot effectively function, namely the generated HC gas cannot be effectively reduced into harmless gases such as carbon dioxide, water and nitrogen, and the HC gas is directly discharged into the air to cause air pollution.
In order to solve the above problems, the prior art generally adopts methods such as catalyst electrical heating, air preheating, etc. to enable the three-way catalyst to quickly play a catalytic role or quickly generate sufficient combustible mixture, thereby reducing the exhaust emission of the exhaust gas in the cold start and warm-up processes of the gasoline engine. Although these methods play a certain role in reducing exhaust gas emissions during cold start, the methods of electrical heating of the catalyst, air preheating, etc. all require additional heating parts, which accordingly results in increased costs for manufacturing and manufacturing the vehicle, and also reduces the reliability of the vehicle.
Disclosure of Invention
In order to solve the above technical problem, the present application provides a method for reducing exhaust emissions of an engine, which can effectively reduce exhaust emissions generated during a cold start of a vehicle without increasing manufacturing costs.
The embodiment of the application discloses the following technical scheme:
in a first aspect, an embodiment of the present application provides a method for reducing exhaust emissions of an engine, which is applied to an engine management system EMS, and the method includes:
detecting an engine running state and a vehicle running state;
when the engine running state represents that the engine is in an idling state and the vehicle running state represents that the vehicle is in a stopping state, starting a emission reduction strategy; the emission reduction strategy is used to exhaust residual gaseous pollutants within the engine.
Optionally, the emission reduction strategy comprises any one or more of the following ways:
controlling the opening degree of the throttle valve to be larger than or equal to a preset opening degree;
delaying clutch engagement time;
controlling the electronic water pump to be in a disengagement state;
the valve overlap angle is made larger than the preset overlap position by controlling the phase of the intake camshaft and the phase of the exhaust camshaft.
Optionally, when the emission reduction strategy includes that the opening degree of the control throttle valve is greater than or equal to a preset opening degree, the opening degree of the control throttle valve is greater than or equal to the preset opening degree, including:
and controlling the throttle valve to be in a full-open state.
Optionally, the engine adopts a hybrid system, and when the emission reduction strategy includes that the electronic water pump is controlled to be in a disengaged state, the controlling of the electronic water pump to be in the disengaged state includes:
and controlling the electronic water pump to be in a disengagement state in an electronic driving mode.
Optionally, the detecting the engine operating state and the vehicle driving state includes:
determining the running state of the engine by detecting the rotating speed, the oil injection signal, the ignition signal and the position of a camshaft of the engine;
the vehicle running state is determined by detecting a vehicle running speed.
Optionally, the method further includes:
ending the emission reduction strategy upon detection of a stop of rotation of the engine.
In a second aspect, embodiments of the present application provide an apparatus for reducing exhaust emissions from an engine, the apparatus comprising:
the detection module is used for detecting the running state of the engine and the running state of the vehicle;
the processing module is used for starting a emission reduction strategy when the running state of the engine represents that the engine is in an idling state and the running state of the vehicle represents that the vehicle is in a stopped state; the emission reduction strategy is used to exhaust residual gaseous pollutants within the engine.
Optionally, the emission reduction strategy comprises any one or more of the following ways:
controlling the opening degree of the throttle valve to be larger than or equal to a preset opening degree;
delaying clutch engagement time;
controlling the electronic water pump to be in a disengagement state;
the valve overlap angle is made larger than the preset overlap position by controlling the phase of the intake camshaft and the phase of the exhaust camshaft.
Optionally, the detection module is specifically configured to:
determining the running state of the engine by detecting the rotating speed, the oil injection signal, the ignition signal and the position of a camshaft of the engine;
the vehicle running state is determined by detecting a vehicle running speed.
Optionally, the apparatus further comprises:
an end module ends the emission reduction strategy upon detection of a stop of rotation of the engine.
It can be seen from the foregoing technical solutions that, the method for reducing exhaust emission of an Engine provided in the embodiment of the present application is applied to an Engine Management System (EMS), and the method includes: detecting an engine running state and a vehicle running state, wherein the engine running state represents that the engine is in an idling state, the vehicle running state represents that the vehicle is in a stopping state, and when a flameout instruction is received and the engine is in a free-sliding state, starting a emission reduction strategy for discharging residual gas pollutants in the engine. Compared with the prior art, the method for reducing the exhaust emission of the engine focuses on reducing the residual gas pollutants in the cylinder when the engine is shut down, fully utilizes the advantages that the temperature of the three-way catalyst is high after the engine is shut down and the catalytic conversion can still be effectively carried out, and immediately discharges the residual gas pollutants in the engine cylinder in a harmless gas form, so that the discharge of a large amount of harmful gas when the vehicle is cold started again is effectively avoided, and no additional device is required to be installed on the vehicle; in addition, harmful gas is discharged from the engine cylinder when the engine is stopped, and the phenomenon that the harmful gas which cannot be discharged is subsequently condensed into liquid oil gas to flow into the engine oil of the oil pan of the engine and the engine oil is diluted can be avoided. Especially for vehicles using Start-Stop technology (Start-Stop technology), the number of applications of the present invention is significantly increased, and the effects of reducing emissions and oil dilution are more significant, because the engine may frequently be stalled and then restarted.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a schematic structural diagram of an exhaust emission system provided in an embodiment of the present application;
FIG. 2 is a schematic flow chart illustrating a method for reducing exhaust emissions from an engine according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of an apparatus for reducing engine exhaust emissions according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present application and in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The inventor researches and discovers that a large part of exhaust emission generated in the cold starting and warming-up processes of the gasoline engine comes from residual exhaust waste in a cylinder, and if the residual exhaust waste in the cylinder can be reasonably reduced, the exhaust emission generated in the cold starting and warming-up processes can be remarkably reduced.
The present application is based on the above technical idea of the inventor, and provides a method for reducing exhaust emission of an engine, which can effectively reduce exhaust generated during a cold start of a vehicle without increasing manufacturing cost. The following first introduces the core technical idea of the method for reducing the exhaust emission of the engine provided by the embodiment of the present application:
the method for reducing the exhaust emission of the engine provided by the embodiment of the application is applied to EMS, and comprises the following steps: detecting an engine running state and a vehicle running state, wherein the engine running state represents that the engine is in an idling state, the vehicle running state represents that the vehicle is in a stopping state, and when a flameout instruction is received and the engine is in a free-sliding state, starting a emission reduction strategy for discharging residual gas pollutants in the engine.
Compared with the prior art, the method for reducing the exhaust emission of the engine focuses on reducing the residual gas pollutants in the cylinder when the engine is shut down, fully utilizes the advantages that the temperature of the three-way catalyst is high after the engine is shut down and the catalytic conversion can still be effectively carried out, and immediately discharges the residual gas pollutants in the engine cylinder in a harmless gas form, so that the discharge of a large amount of harmful gas when the vehicle is cold started again is effectively avoided, and no additional device is required to be installed on the vehicle; in addition, harmful gas is discharged from the engine cylinder when the engine is stopped, and the phenomenon that the harmful gas which cannot be discharged is subsequently condensed into liquid oil gas to flow into the engine oil of the oil pan of the engine and the engine oil is diluted can be avoided.
It should be noted that, in practical applications, the method for reducing exhaust emissions provided by the embodiments of the present application is generally applied to an exhaust emission system, and the exhaust emission system is described below. Referring to fig. 1, fig. 1 is an exhaust emission system provided in an embodiment of the present application.
As shown in fig. 1, the exhaust gas discharge system includes an air cleaner 1, an intake pipe 2, a throttle valve 3, an intake manifold 4, a water pump 5, an engine body 6, an exhaust manifold 7, a three-way catalyst 8, an exhaust pipe 9, an EMS system 10, an intake camshaft 11, a clutch 12, a flywheel 13, and an exhaust camshaft 14.
Wherein, the air filter 1, the air inlet pipe 2, the throttle valve 3, the air inlet manifold 4, the engine body 6, the exhaust manifold 7, the three-way catalyst 8 and the exhaust pipe 9 are connected in sequence; the water pump 5 is arranged at the front end of the engine body 6; the intake camshaft 11 is on the intake side of the engine, and the exhaust camshaft 14 is on the exhaust side of the engine; the EMS system is used for executing the method for reducing the exhaust emission of the engine provided by the embodiment of the application, and can send commands to the throttle valve 3, the water pump 5, the intake camshaft 11, the exhaust camshaft 14 and the clutch 12 to enable relevant devices to execute corresponding actions.
The method for reducing the exhaust emission of the engine provided by the embodiment of the application is described by the following way of the embodiment:
referring to fig. 2, fig. 2 is a schematic flow chart of a method for reducing exhaust emissions of an engine according to an embodiment of the present application. It should be noted that, the method for reducing engine exhaust emission provided by the embodiment of the present application is applied to an EMS system, as shown in fig. 2, and the method for reducing engine exhaust emission includes the following steps:
step 201: an engine running state and a vehicle running state are detected.
The EMS system detects the running state of the engine and the running state of the vehicle in real time so as to determine whether to start an emission reduction strategy according to the detected running state of the engine and the detected running state of the vehicle.
When the EMS system specifically detects the running state of the engine and the running state of the vehicle, the running state of the engine can be determined by detecting the rotating speed, the oil injection signal, the ignition signal and the position of a camshaft of the engine; the vehicle running state is determined by detecting the vehicle running speed.
Specifically, the EMS system can automatically read the rotating speed of the engine from the engine rotating speed sensor, and correspondingly read the oil injection signal, the ignition signal and the position of the camshaft from the corresponding sensor, and further, the EMS system can determine the running state of the engine according to the rotating speed, the oil injection signal, the ignition signal and the position of the camshaft of the engine, which are read by the EMS system; similarly, the EMS system may also read the vehicle running speed from the vehicle speed sensor, and then determine the vehicle running state from the read vehicle running speed.
It should be understood that, in practical applications, the EMS system may also determine the engine operating state and the vehicle operating state in real time in other manners, and the manner in which the EMS system detects the engine operating state and the vehicle operating state is not limited in any way.
Step 202: when the engine running state indicates that the engine is in an idling state and the vehicle running state indicates that the vehicle is in a stopping state, and when a flameout instruction is received and the engine is in a free-sliding state, an emission reduction strategy is started; the emission reduction strategy is used to exhaust residual gaseous pollutants within the engine.
After detecting the running state of the engine and the running state of the vehicle, the EMS system judges the detected running state of the engine and the running state of the vehicle, namely judges whether the running state of the engine represents that the engine is in an idling state or not and judges whether the running state of the vehicle represents that the vehicle is in a stopped state or not, if the running state of the engine represents that the engine is in the idling state at the moment and the running state of the vehicle represents that the vehicle is in the stopped state at the moment, and when receiving a flameout instruction, the EMS starts an emission reduction strategy which is used for discharging residual gas pollutants in the engine at the moment.
The emission reduction strategy may specifically include any one or more of the following implementations: controlling the opening degree of the throttle valve to be larger than or equal to a preset opening degree; delaying clutch engagement time; controlling the electronic water pump to be in a disengagement state; the valve overlap angle is made larger than the preset overlap position by controlling the phase of the intake camshaft and the phase of the exhaust camshaft.
It should be understood that in actual practice, the emission reduction strategy may include any one or more of the implementations described above, but the more implementations included in the emission reduction strategy, the better the effect of reducing engine drag, the better the effect of increasing the intensity of the gas flow purge, and correspondingly, the better the effect of discharging residual gaseous pollutants within the engine.
Specifically, the opening degree of the throttle valve is controlled to be larger than or equal to the preset opening degree, so that the air intake resistance can be effectively reduced, the purging intensity of air flow is increased, and the residual gas pollutants in the cylinder can be purged to the three-way catalytic converter, so that the three-way catalytic converter can perform catalytic conversion treatment on the gas pollutants under the condition of being in a hot state.
It should be understood that the preset opening may be set according to actual conditions, and the preset opening is usually set to be more than 10%, and the value of the preset opening is not particularly limited.
It should be noted that, when the emission reduction strategy includes controlling the opening degree of the throttle valve to be greater than or equal to the preset opening degree, preferably, the throttle valve may be controlled to be in a fully open state, so as to further increase the purging intensity of the gas flow and improve the purging effect on the gaseous pollutants.
Specifically, the delay of the clutch connection time and the control of the electronic water pump in the disengaged state can reduce the resistance of the engine in the sliding process, so that the sliding time and the number of running circles of the engine are prolonged, more gas pollutants remained in the engine are favorably purged into the three-way catalyst, and the catalytic conversion treatment is carried out on the gas pollutants under the condition that the three-way catalyst is in a hot state.
It should be noted that, when the engine adopts a hybrid system, such as a hybrid system in the form of 48V, and when the emission reduction strategy includes controlling the electronic water pump to be in a disengaged state, the EMS system may control the electronic water pump to be in the disengaged state in an electronic driving manner, which may further reduce the friction resistance received during the engine coasting process and prolong the engine coasting time compared to a manner of directly driving the electronic water pump by using a crankshaft.
Specifically, the valve overlap angle is larger than the preset overlap position by controlling the phase of the intake camshaft and the phase of the exhaust camshaft, the opening time of the intake valve can be advanced as far as possible, and the closing time of the exhaust valve can be delayed as far as possible, so that the purging resistance of fresh air is reduced, namely the purging intensity of air flow is increased, and the residual gas pollutants in the cylinder can be purged into the three-way catalyst.
Since the EMS system is always detecting engine operating conditions, when the EMS system detects that the engine has stopped rotating, the EMS system may end the emission reduction strategy described above, i.e., perform any one or more of the following actions in accordance with the emission reduction strategy implemented accordingly: and restoring the closed position of the throttle valve, resetting the clutch and resetting the intake camshaft and the exhaust camshaft.
The method for reducing the exhaust emission of the Engine provided by the embodiment of the application is applied to an Engine Management System (EMS), and comprises the following steps: detecting an engine running state and a vehicle running state, wherein the engine running state represents that the engine is in an idling state, the vehicle running state represents that the vehicle is in a stopping state, and when a flameout instruction is received and the engine is in a free-sliding state, starting a emission reduction strategy for discharging residual gas pollutants in the engine. Compared with the prior art, the method for reducing the exhaust emission of the engine focuses on reducing the residual gas pollutants in the cylinder when the engine is shut down, fully utilizes the advantages that the temperature of the three-way catalyst is high after the engine is shut down and the catalytic conversion can still be effectively carried out, and immediately discharges the residual gas pollutants in the engine cylinder in a harmless gas form, so that the discharge of a large amount of harmful gas when the vehicle is cold started again is effectively avoided, and no additional device is required to be installed on the vehicle; in addition, harmful gas is discharged from the engine cylinder when the engine is stopped, and the phenomenon that the harmful gas which cannot be discharged is subsequently condensed into liquid oil gas to flow into the engine oil of the oil pan of the engine and the engine oil is diluted can be avoided.
In view of the above-mentioned method for reducing engine exhaust emission, the present application also provides an apparatus for reducing engine exhaust emission, so that the above-mentioned method for reducing engine exhaust emission is applied in practice.
Referring to fig. 3, fig. 3 is a schematic structural diagram of an apparatus for reducing engine exhaust emissions according to an embodiment of the present disclosure. As shown in fig. 3, the apparatus includes:
the detection module 301 is used for detecting the running state of an engine and the running state of a vehicle;
the processing module 302 is configured to represent that the engine is in an idle state in the engine running state, represent that the vehicle is in a stopped state in the vehicle running state, and start an emission reduction strategy when the engine is in a free-wheeling state after receiving a flameout instruction; the emission reduction strategy is used to exhaust residual gaseous pollutants within the engine.
Optionally, the emission reduction strategy comprises any one or more of the following ways:
controlling the opening degree of the throttle valve to be larger than or equal to a preset opening degree;
delaying clutch engagement time;
controlling the electronic water pump to be in a disengagement state;
the valve overlap angle is made larger than the preset overlap position by controlling the phase of the intake camshaft and the phase of the exhaust camshaft.
Optionally, when the emission reduction strategy includes that the opening degree of the control throttle valve is greater than or equal to a preset opening degree, the processing module is specifically configured to:
and controlling the throttle valve to be in a full-open state.
Optionally, when the engine adopts a hybrid system, and when the emission reduction strategy includes controlling the electronic water pump to be in a disengaged state, the processing module is specifically configured to:
and controlling the electronic water pump to be in a disengagement state in an electronic driving mode.
Optionally, the detection module is specifically configured to:
determining the running state of the engine by detecting the rotating speed, the oil injection signal, the ignition signal and the position of a camshaft of the engine;
the vehicle running state is determined by detecting a vehicle running speed.
Optionally, the apparatus further comprises:
an end module ends the emission reduction strategy upon detection of a stop of rotation of the engine.
The device for reducing exhaust emission of the engine provided by the embodiment of the application can detect the running state of the engine and the running state of the vehicle, the running state of the engine represents that the engine is in an idling state, the running state of the vehicle represents that the vehicle is in a stopping state, and when a flameout instruction is received and the engine is in a free-sliding state, a emission reduction strategy for discharging residual gas pollutants in the engine is started. Compared with the prior art, the device for reducing the exhaust emission of the engine focuses on reducing the residual gas pollutants in the cylinder when the engine is shut down, fully utilizes the advantages that the temperature of the three-way catalyst is high after the engine is shut down and the catalytic conversion can still be effectively carried out, and immediately discharges the residual gas pollutants in the engine cylinder in a harmless gas form, so that the discharge of a large amount of harmful gas when the vehicle is cold started again is effectively avoided, and no additional device is required to be installed on the vehicle; in addition, harmful gas is discharged from the engine cylinder when the engine is stopped, and the phenomenon that the harmful gas which cannot be discharged is subsequently condensed into liquid oil gas to flow into the engine oil of the oil pan of the engine and the engine oil is diluted can be avoided.
It should be noted that, in the present specification, all the embodiments are described in a progressive manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the apparatus and system embodiments, since they are substantially similar to the method embodiments, they 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 embodiments of the apparatus and system are merely illustrative, and the units described as separate parts may or may not be physically separate, and the parts displayed 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.
The above description is only one specific embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A method for reducing exhaust emissions from an engine, applied to an engine management system, EMS, the method comprising:
detecting an engine running state and a vehicle running state;
when the engine running state indicates that the engine is in an idling state and the vehicle running state indicates that the vehicle is in a stopped state, and when a flameout instruction is received and the engine starts to slide freely, an emission reduction strategy is started; the emission reduction strategy is used to exhaust residual gaseous pollutants within the engine.
2. The method of claim 1, wherein the emission reduction strategy comprises any one or more of:
controlling the opening degree of the throttle valve to be larger than or equal to a preset opening degree;
delaying clutch engagement time;
controlling the electronic water pump to be in a disengagement state;
the valve overlap angle is made larger than the preset overlap position by controlling the phase of the intake camshaft and the phase of the exhaust camshaft.
3. The method according to claim 2, wherein when the emission reduction strategy includes that the opening degree of the control throttle valve is greater than or equal to a preset opening degree, comprising:
and controlling the throttle valve to be in a full-open state.
4. The method of claim 2, wherein the engine employs a hybrid system, and when the reduced emission strategy includes controlling an electronic water pump in a disengaged state, the controlling the electronic water pump in the disengaged state comprises:
and controlling the electronic water pump to be in a disengagement state in an electronic driving mode.
5. The method of claim 1, wherein said detecting an engine operating condition and a vehicle driving condition comprises:
determining the running state of the engine by detecting the rotating speed, the oil injection signal, the ignition signal and the position of a camshaft of the engine;
the vehicle running state is determined by detecting a vehicle running speed.
6. The method of claim 1, further comprising:
ending the emission reduction strategy upon detection of a stop of rotation of the engine.
7. An apparatus for reducing exhaust emissions from an engine, the apparatus comprising:
the detection module is used for detecting the running state of the engine and the running state of the vehicle;
the processing module is used for representing that the engine is in an idling state in the engine running state, representing that the vehicle is in a stopped state in the vehicle running state, and starting an emission reduction strategy when the engine starts to slide freely after receiving a flameout instruction; the emission reduction strategy is used to exhaust residual gaseous pollutants within the engine.
8. The apparatus of claim 7, wherein the emission reduction strategy comprises any one or more of:
controlling the opening degree of the throttle valve to be larger than or equal to a preset opening degree;
delaying clutch engagement time;
controlling the electronic water pump to be in a disengagement state;
the valve overlap angle is made larger than the preset overlap position by controlling the phase of the intake camshaft and the phase of the exhaust camshaft.
9. The apparatus of claim 7, wherein the detection module is specifically configured to:
determining the running state of the engine by detecting the rotating speed, the oil injection signal, the ignition signal and the position of a camshaft of the engine;
the vehicle running state is determined by detecting a vehicle running speed.
10. The apparatus of claim 7, further comprising:
an end module ends the emission reduction strategy upon detection of a stop of rotation of the engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910060115.2A CN111456836A (en) | 2019-01-22 | 2019-01-22 | Method and device for reducing exhaust emission of engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910060115.2A CN111456836A (en) | 2019-01-22 | 2019-01-22 | Method and device for reducing exhaust emission of engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111456836A true CN111456836A (en) | 2020-07-28 |
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| CN201910060115.2A Pending CN111456836A (en) | 2019-01-22 | 2019-01-22 | Method and device for reducing exhaust emission of engine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115045740A (en) * | 2021-03-08 | 2022-09-13 | 上汽通用汽车有限公司 | Monitoring device and method for cold start emission reduction strategy and vehicle |
| US11624333B2 (en) | 2021-04-20 | 2023-04-11 | Kohler Co. | Exhaust safety system for an engine |
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| CN115045740A (en) * | 2021-03-08 | 2022-09-13 | 上汽通用汽车有限公司 | Monitoring device and method for cold start emission reduction strategy and vehicle |
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