CN107916972A - Engine particle trap initiative regeneration householder method, device, storage medium and system - Google Patents
Engine particle trap initiative regeneration householder method, device, storage medium and system Download PDFInfo
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- CN107916972A CN107916972A CN201711409670.9A CN201711409670A CN107916972A CN 107916972 A CN107916972 A CN 107916972A CN 201711409670 A CN201711409670 A CN 201711409670A CN 107916972 A CN107916972 A CN 107916972A
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- oxygen concentration
- active regeneration
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- particle trap
- trap
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- 239000002245 particle Substances 0.000 title claims abstract description 220
- 238000011069 regeneration method Methods 0.000 title claims abstract description 132
- 230000008929 regeneration Effects 0.000 title claims abstract description 131
- 238000000034 method Methods 0.000 title claims abstract description 35
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 160
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 160
- 239000001301 oxygen Substances 0.000 claims abstract description 160
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 44
- 229910052799 carbon Inorganic materials 0.000 claims description 44
- 238000002347 injection Methods 0.000 claims description 25
- 239000007924 injection Substances 0.000 claims description 25
- 238000005070 sampling Methods 0.000 claims description 15
- 238000004590 computer program Methods 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 4
- 230000001960 triggered effect Effects 0.000 description 8
- 238000005507 spraying Methods 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 239000000446 fuel Substances 0.000 description 5
- 238000009825 accumulation Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000003197 catalytic effect Effects 0.000 description 2
- 239000013618 particulate matter Substances 0.000 description 2
- 230000001172 regenerating effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
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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
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N9/00—Electrical control of exhaust gas treating apparatus
- F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
- Processes For Solid Components From Exhaust (AREA)
Abstract
The invention discloses a kind of engine particle trap initiative regeneration householder method, device, storage medium and system, and an air nozzle is set in the entrance of the particle trap, the described method includes：When the particle trap triggers initiative regeneration, the demand oxygen concentration of the initiative regeneration is calculated；The current oxygen concentration of the inlet of the particle trap is sampled with frequency H；According to current oxygen concentration, the temperature in the particle trap is adjusted, so that the particulate ignition in the particle trap；According to the difference of the current oxygen concentration that collects and the demand oxygen concentration, the flow and injecting time of the air nozzle are controlled in real time.Realize and improve particle trap initiative regeneration speed, vehicle cornering ability when lifting particle trap initiative regeneration.
Description
Technical Field
The invention belongs to the field of active regeneration of gasoline engine particle traps, and particularly relates to an auxiliary method, device, storage medium and system for active regeneration of an engine particle trap.
Background
With the official release of the emission regulations in the VI stage of China, clear limit requirements are made on the emission of PM and PN of particulate matters. To address particulate matter emission requirements, current GDI engine platform aftertreatment systems require the addition of a particulate matter trap, i.e., an engine particle trap. After the engine particle catcher works for a period of time, particulate emission substances captured by the engine particle catcher are accumulated in the engine particle catcher, wherein most of the particulate emission substances are formed by carbon or carbide tiny particles, and the particulate emission substances accumulated in the engine particle catcher to a certain degree can affect the front and back pressure of the engine particle catcher, so that the power of an automobile is reduced, and the particulate emission substances captured by the engine particle catcher are required to be removed by actively regenerating the engine particle catcher to perform high-temperature combustion on the particulate emission substances.
However, in the conventional arrangement scheme of the after-treatment system, namely the additional arrangement mode of the engine particle catcher, when the engine particle catcher is actively regenerated, the combustion physical property and the air-fuel ratio of the gasoline engine are 14: 7, the engine particle catcher needs to sacrifice the performance of the whole vehicle when actively regenerating due to no surplus oxygen, and the active regeneration capacity of the particle catcher is ensured by adopting an active lean-down strategy of a gasoline engine; however, due to the limited enleanment capabilities allowed by gasoline engines, the oxygen concentration at the inlet of the particle trap remains insufficient, resulting in poor combustion and long regeneration times.
Disclosure of Invention
The embodiment of the invention provides an auxiliary method, device, storage medium and system for active regeneration of an engine particle catcher, which are used for improving the active regeneration rate of the particle catcher and improving the driving performance of a whole vehicle when the particle catcher is actively regenerated.
In a first aspect, embodiments of the present invention provide a method for assisting active regeneration of a particle trap of an engine, wherein an air nozzle is disposed at an inlet of the particle trap, the method comprising:
calculating a required oxygen concentration for active regeneration when the particle trap triggers the active regeneration;
sampling a current oxygen concentration at an inlet of the particle trap at a frequency H;
adjusting a temperature within the particle trap to ignite the particulate within the particle trap based on the current oxygen concentration; and controlling the flow and the injection time of the air nozzle in real time according to the difference value between the acquired current oxygen concentration and the acquired required oxygen concentration.
Further, the controlling the flow rate and the injection time of the air nozzle in real time according to the difference between the collected current oxygen concentration and the collected required oxygen concentration specifically includes:
acquiring the exhaust flow rate of the particle catcher per unit time;
calculating the air amount reaching the required oxygen concentration according to the difference value between the acquired current oxygen concentration and the required oxygen concentration and the exhaust flow;
setting a flow gear of the air nozzle according to the air quantity;
and calculating the injection time for driving the air nozzle according to the air quantity and the flow gear of the air nozzle.
Further, when the particle trap triggers active regeneration, the required oxygen concentration for the active regeneration is calculated, specifically:
acquiring the current carbon loading of the particle catcher and the inlet temperature of the particle catcher;
calculating the required oxygen concentration for the active regeneration based on the current carbon loading of the particle trap, the inlet temperature of the particle trap, and the required regeneration rate for the active regeneration.
Further, the flow characteristic corresponding to the flow gear of the air nozzle is qKg/h, and the air quantity is mdesCalculating to obtain the injection time for driving the air nozzle
Further, before calculating the required oxygen concentration for active regeneration when the particle trap triggers active regeneration, the method further comprises:
acquiring the accumulated carbon amount of the particle catcher;
judging whether the accumulated carbon amount reaches an accumulated carbon amount threshold value for triggering active regeneration; wherein the accumulated carbon amount threshold is set according to the pressure difference or the original discharge amount of the particle catcher;
triggering active regeneration of the particle trap when the accumulated carbon amount reaches an accumulated carbon amount threshold that triggers active regeneration.
In a second aspect, embodiments of the present invention further provide an active regeneration assistance device for an engine particle trap, the device comprising:
a required oxygen concentration acquisition module for calculating a required oxygen concentration for active regeneration when the particle trap triggers active regeneration; the active regeneration is used for increasing the temperature in the particle catcher according to the current oxygen concentration so as to ignite and burn the particles in the particle catcher;
an oxygen concentration sampling module for sampling a current oxygen concentration at an inlet of the particle trap at a frequency H;
the temperature adjusting module is used for adjusting the temperature in the particle catcher according to the current oxygen concentration so as to ignite and burn the particles in the particle catcher;
and the control module is used for controlling the flow and the injection time of the air nozzle in real time according to the difference value between the acquired current oxygen concentration and the acquired required oxygen concentration.
Further, the control module includes:
an exhaust flow rate acquisition unit for acquiring an exhaust flow rate of the particle trap;
an air amount calculation unit for calculating an air amount that reaches the required oxygen concentration based on the difference between the acquired current oxygen concentration and the required oxygen concentration and the exhaust flow rate;
the flow gear setting unit is used for setting the flow gear of the air nozzle according to the air quantity;
and the injection time calculating unit is used for calculating the injection time for driving the air nozzle according to the air quantity and the flow gear of the air nozzle.
Further, the required oxygen concentration obtaining module specifically includes:
a data acquisition unit for acquiring the current carbon loading of the particle trap and the inlet temperature of the particle trap;
and the concentration calculating unit is used for calculating the required oxygen concentration of the active regeneration according to the current carbon load of the particle catcher, the inlet temperature of the particle catcher and the regeneration rate required by the active regeneration.
In a third aspect, the present invention further provides a storage medium including a stored computer program, where the computer program is executed to control a device on which the storage medium is located to execute the active regeneration assist method for an engine particle trap provided in the first aspect.
In a fourth aspect, embodiments of the present invention further provide an active regeneration assistance system for an engine particulate trap, including: an engine management system and an engine particle trap; wherein,
the engine particle trap includes an air nozzle disposed at the particle trap inlet and an oxygen sensor disposed at the particle trap inlet; the engine management system performs the engine particulate trap active regeneration assist method of the first aspect.
The embodiment of the invention has the following beneficial effects:
the embodiment of the invention provides an active regeneration auxiliary method, device, storage medium and system for a particle catcher of an engine, wherein an air nozzle is arranged at the inlet of the particle catcher; calculating a required oxygen concentration for active regeneration when the particle trap triggers the active regeneration; sampling a current oxygen concentration at an inlet of the particle trap at a frequency H; adjusting a temperature within the particle trap to ignite the particulate within the particle trap based on the current oxygen concentration; controlling the flow and the spraying time of the air nozzle in real time according to the difference value between the acquired current oxygen concentration and the acquired required oxygen concentration; when the active regeneration of the particle trap is triggered, detecting the current oxygen concentration at the inlet of the particle trap in real time at a frequency H, controlling the air quantity sprayed by an air nozzle to the inlet of the particle trap by controlling the flow and the spraying time of the air nozzle in real time according to the difference value between the current oxygen concentration collected each time and the required oxygen concentration, and enabling the oxygen concentration at the inlet of the particle trap to quickly reach the required oxygen concentration of the active regeneration through closed-loop control of the oxygen concentration at the inlet of the particle trap, so that accurate and quick response to the target air-fuel ratio of the particle trap is realized, and the active regeneration rate of the particle trap is improved; and because the oxygen concentration at the inlet of the particle catcher quickly reaches the required oxygen concentration for active regeneration, the engine is not required to be actively thinned, the reduction of the driving performance of the whole vehicle is avoided, and the driving performance of the whole vehicle is improved when the particle catcher is actively regenerated.
Drawings
FIG. 1 is a schematic flow chart of an active regeneration assistance method for an engine particulate trap according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an active regeneration assisting device of an engine particulate trap according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a control module of an active regeneration assist device for an engine particulate trap according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of an active regeneration assistance system for an engine particulate trap according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a schematic flow chart of an active regeneration assisting method for an engine particulate trap according to an embodiment of the present invention is shown.
In a first aspect, the active regeneration assisting method for an engine particle trap provided by the embodiments of the present invention may be executed by an electronic control unit of an engine management system, and the electronic control unit is used as an execution subject for the following description.
An air nozzle is arranged at the inlet of the particle catcher, and the active regeneration auxiliary method of the particle catcher of the engine comprises the following steps:
s1, when the particle catcher triggers active regeneration, calculating the required oxygen concentration of the active regeneration;
s2, sampling the current oxygen concentration at the inlet of the particle catcher with a frequency H;
s3, adjusting the temperature in the particle catcher according to the current oxygen concentration so as to ignite and burn the particles in the particle catcher;
and S4, controlling the flow and the injection time of the air nozzle in real time according to the difference value between the acquired current oxygen concentration and the acquired required oxygen concentration.
It should be noted that in the embodiment of the present invention, the engine particle trap is arranged in an additional type of particle trap, that is, the particle trap is installed behind the three-way catalytic converter and is communicated with the three-way catalytic converter through an exhaust pipe. The air nozzle arranged at the inlet of the particle trap may be an air nozzle integrated at the exhaust line connected to the inlet of the particle trap and the inlet of the particle trap. When the active regeneration of the particle catcher is triggered, the electronic control unit obtains the current carbon loading condition of the particle catcher and the inlet temperature of the particle catcher to calculate the required oxygen concentration required by the active regeneration of the particle catcher, a linear oxygen sensor is further arranged at the inlet of the particle catcher, the oxygen sensor measures the oxygen concentration at the inlet of the particle catcher according to the frequency H, sends the collected current oxygen concentration signal to the electronic control unit of an engine management system to be collected and processed, and finally obtains the current oxygen concentration value at the inlet of the particle catcher, after the difference value between the current oxygen concentration and the required oxygen concentration is calculated, the difference value change of the oxygen concentration is obtained according to the difference value change of the current oxygen concentration measured by each sampling, and the electronic control unit of the engine management system controls the flow and the injection of the air nozzle in real time according to the difference value change of the oxygen concentration Time.
Further, the specific implementation process of the step S3 may be:
acquiring the exhaust flow rate of the particle catcher per unit time;
calculating the air amount reaching the required oxygen concentration according to the difference value between the acquired current oxygen concentration and the required oxygen concentration and the exhaust flow;
setting a flow gear of the air nozzle according to the air quantity;
and calculating the injection time for driving the air nozzle according to the air quantity and the flow gear of the air nozzle.
It should be noted that, in the embodiment of the present invention, the air nozzle has different flow rate gears, each flow rate gear corresponds to a different flow rate characteristic, and when the calculated amount of air reaching the required oxygen concentration is large, the flow rate gear of the air nozzle can be set to the maximum gear, so that more air can be injected from the air nozzle to the inlet of the particle trap, thereby further reducing the injection time for driving the air nozzle; when the calculated air amount reaching the required oxygen concentration is small, the flow gear of the air nozzle can be set to be a proper small flow gear, so that air is slowly sprayed from the air nozzle to the inlet of the particle catcher, and more accurate control is realized. Since the air mass oxygen content is 21%, the amount of air to achieve the required oxygen concentration can be calculated by back-stepping with knowledge of the exhaust gas flow rate per unit time of the particle trap and the target oxygen concentration.
Further, the specific implementation process of the step S1 may be:
acquiring the current carbon loading of the particle catcher and the inlet temperature of the particle catcher;
calculating the required oxygen concentration for the active regeneration based on the current carbon loading of the particle trap, the inlet temperature of the particle trap, and the required regeneration rate for the active regeneration.
It should be noted that, in the embodiment of the present invention, a large number of samples are performed in advance for oxygen concentrations required by different carbon loads of the particle trap when active regeneration is triggered and different inlet temperatures of the particle trap, and carbon load, temperature, and oxygen concentration sampling data are used as training data to be trained and a model is built in combination with a regeneration rate of the active regeneration under each condition of the particle trap, and when an electronic control unit substitutes the currently acquired data of the current carbon load of the particle trap and the inlet temperature of the particle trap into the built model to calculate, a required oxygen concentration for the active regeneration of the particle trap under the current condition can be obtained.
Further, the flow characteristic corresponding to the flow gear of the air nozzle is qKg/h, and the air quantity is mdesCalculating to obtain the injection time for driving the air nozzle
Further, before calculating the required oxygen concentration for active regeneration when the particle trap triggers active regeneration, the method further comprises:
acquiring the accumulated carbon amount of the particle catcher;
judging whether the accumulated carbon amount reaches an accumulated carbon amount threshold value for triggering active regeneration; wherein the accumulated carbon amount threshold is set according to the pressure difference or the original discharge amount of the particle catcher;
triggering active regeneration of the particle trap when the accumulated carbon amount reaches an accumulated carbon amount threshold that triggers active regeneration.
It should be noted that, in the pressure difference method in the embodiment of the present invention, the accumulated carbon amount may affect the pressure at the front inlet and the rear outlet of the particle trap under a specific condition, the accumulated carbon amount of the particle trap is fed back through the change of the front-rear pressure difference, when the front-rear pressure difference of the particle trap is too large to affect the operation of the engine, and the active regeneration of the particle trap must be triggered to remove the accumulated carbon substances in the particle trap, the carbon amount fed back by the pressure difference at this time is the threshold value of the accumulated carbon amount for triggering the active regeneration; when the carbon accumulation substance in the particle catcher influences the operation condition of the engine and active regeneration must be triggered, the carbon accumulation amount of the particle catcher can be calculated through the original discharge amount and the operation condition operation time of the engine under different working conditions, and the calculated carbon accumulation amount is the threshold value of the carbon accumulation amount for triggering the active regeneration.
The embodiment of the invention provides an active regeneration auxiliary method of an engine particle catcher, wherein an air nozzle is arranged at the inlet of the particle catcher; calculating a required oxygen concentration for active regeneration when the particle trap triggers the active regeneration; sampling a current oxygen concentration at an inlet of the particle trap at a frequency H; adjusting a temperature within the particle trap to ignite the particulate within the particle trap based on the current oxygen concentration; controlling the flow and the spraying time of the air nozzle in real time according to the difference value between the acquired current oxygen concentration and the acquired required oxygen concentration; when the active regeneration of the particle trap is triggered, detecting the current oxygen concentration at the inlet of the particle trap in real time at a frequency H, controlling the air quantity sprayed by an air nozzle to the inlet of the particle trap by controlling the flow and the spraying time of the air nozzle in real time according to the difference value between the current oxygen concentration collected each time and the required oxygen concentration, and enabling the oxygen concentration at the inlet of the particle trap to quickly reach the required oxygen concentration of the active regeneration through closed-loop control of the oxygen concentration at the inlet of the particle trap, so that accurate and quick response to the target air-fuel ratio of the particle trap is realized, and the active regeneration rate of the particle trap is improved; and because the oxygen concentration at the inlet of the particle catcher quickly reaches the required oxygen concentration for active regeneration, the engine is not required to be actively thinned, the reduction of the driving performance of the whole vehicle is avoided, and the driving performance of the whole vehicle is improved when the particle catcher is actively regenerated.
Referring to fig. 2, a schematic structural diagram of an active regeneration assisting device of an engine particle trap according to an embodiment of the present invention is shown;
in a second aspect, embodiments of the present invention further provide an active regeneration assisting device for an engine particle catcher, including:
a required oxygen concentration acquisition module 201, configured to calculate a required oxygen concentration for active regeneration when the particle trap triggers active regeneration; the active regeneration is used for increasing the temperature in the particle catcher according to the current oxygen concentration so as to ignite and burn the particles in the particle catcher;
an oxygen concentration sampling module 202 for sampling a current oxygen concentration at an inlet of the particle trap at a frequency H;
a temperature adjusting module 203, configured to adjust a temperature in the particle trap according to the current oxygen concentration, so as to ignite and burn the particles in the particle trap;
and the control module 204 is configured to control the flow rate and the injection time of the air nozzle in real time according to a difference between the acquired current oxygen concentration and the acquired required oxygen concentration.
Referring to fig. 3, a schematic structural diagram of a control module of an active regeneration assisting device of an engine particulate trap according to an embodiment of the present invention is shown.
Further, the control module 203 includes:
an exhaust flow rate acquisition unit 301 for acquiring an exhaust flow rate of the particle trap;
an air amount calculation unit 302, configured to calculate an amount of air that reaches the required oxygen concentration according to the difference between the collected current oxygen concentration and the required oxygen concentration and the exhaust flow rate;
a flow rate shift setting unit 303, configured to set a flow rate shift of the air nozzle according to the air amount;
and an injection time calculation unit 304 for calculating an injection time for driving the air nozzle according to the air amount and the flow rate gear of the air nozzle.
Further, the required oxygen concentration obtaining module 201 specifically includes:
a data acquisition unit for acquiring the current carbon loading of the particle trap and the inlet temperature of the particle trap;
and the concentration calculating unit is used for calculating the required oxygen concentration of the active regeneration according to the current carbon load of the particle catcher, the inlet temperature of the particle catcher and the regeneration rate required by the active regeneration.
According to the active regeneration auxiliary device for the particle trap of the engine provided by the embodiment of the invention, when the particle trap triggers active regeneration, a required oxygen concentration acquisition module 201 calculates the required oxygen concentration of the active regeneration, an oxygen concentration sampling module 202 samples the current oxygen concentration at the inlet of the particle trap at a frequency H, a temperature adjusting module 203 adjusts the temperature in the particle trap according to the current oxygen concentration so as to ignite and burn particles in the particle trap, and a control module 204 controls the flow and the injection time of an air nozzle in real time according to the difference value between the collected current oxygen concentration and the required oxygen concentration; wherein the exhaust flow rate acquiring unit 301 acquires the exhaust flow rate of the particle trap, the air amount calculating unit 302 calculates the amount of air reaching the required oxygen concentration based on the difference between the acquired current oxygen concentration and the required oxygen concentration and the exhaust flow rate, the flow rate step setting unit 303 sets the flow rate step of the air nozzle based on the amount of air, and the injection time calculating unit 304 calculates the injection time for driving the air nozzle based on the amount of air and the flow rate step of the air nozzle. When the active regeneration of the particle catcher is triggered, detecting the current oxygen concentration at the inlet of the particle catcher in real time by using the frequency H, controlling the air quantity sprayed by an air nozzle to the inlet of the particle catcher by controlling the flow and the spraying time of the air nozzle in real time according to the difference value between the current oxygen concentration collected each time and the required oxygen concentration, and enabling the oxygen concentration at the inlet of the particle catcher to quickly reach the required oxygen concentration of the active regeneration by closed-loop control of the oxygen concentration at the inlet of the particle catcher so as to realize accurate and quick response of the target air-fuel ratio of the particle catcher and further realize improvement of the active regeneration rate of the particle catcher; and because the oxygen concentration at the inlet of the particle catcher quickly reaches the required oxygen concentration for active regeneration, the engine is not required to be actively thinned, the reduction of the driving performance of the whole vehicle is avoided, and the driving performance of the whole vehicle is improved when the particle catcher is actively regenerated.
In a third aspect, the present invention further provides a storage medium including a stored computer program, where the computer program is executed to control a device on which the storage medium is located to execute the active regeneration assist method for an engine particle trap provided in the first aspect.
Referring to fig. 4, a schematic structural diagram of an active regeneration assisting system of an engine particulate trap according to an embodiment of the present invention is shown.
In a fourth aspect, embodiments of the present invention further provide an active regeneration assistance system for an engine particulate trap, including: an engine management system and an engine particle trap; wherein,
the engine particle trap includes an air nozzle disposed at the particle trap inlet and an oxygen sensor disposed at the particle trap inlet. The engine management system performs the engine particulate trap active regeneration assist method of the first aspect.
In summary, in the active regeneration method, device, storage medium and system for a particle trap of an engine according to the embodiments of the present invention, an air nozzle is disposed at an inlet of the particle trap; calculating a required oxygen concentration for active regeneration when the particle trap triggers the active regeneration; sampling a current oxygen concentration at an inlet of the particle trap at a frequency H; adjusting a temperature within the particle trap to ignite the particulate within the particle trap based on the current oxygen concentration; controlling the flow and the spraying time of the air nozzle in real time according to the difference value between the acquired current oxygen concentration and the acquired required oxygen concentration; when the active regeneration of the particle trap is triggered, detecting the current oxygen concentration at the inlet of the particle trap in real time at a frequency H, controlling the air quantity sprayed by an air nozzle to the inlet of the particle trap by controlling the flow and the spraying time of the air nozzle in real time according to the difference value between the current oxygen concentration collected each time and the required oxygen concentration, and enabling the oxygen concentration at the inlet of the particle trap to quickly reach the required oxygen concentration of the active regeneration through closed-loop control of the oxygen concentration at the inlet of the particle trap, so that accurate and quick response to the target air-fuel ratio of the particle trap is realized, and the active regeneration rate of the particle trap is improved; and because the oxygen concentration at the inlet of the particle catcher quickly reaches the required oxygen concentration for active regeneration, the engine is not required to be actively thinned, the reduction of the driving performance of the whole vehicle is avoided, and the driving performance of the whole vehicle is improved when the particle catcher is actively regenerated.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A method of assisting in the active regeneration of an engine particle trap, wherein an air jet is provided at an inlet of the particle trap, the method comprising:
calculating a required oxygen concentration for active regeneration when the particle trap triggers the active regeneration;
sampling a current oxygen concentration at an inlet of the particle trap at a frequency H;
adjusting a temperature within the particle trap to ignite the particulate within the particle trap based on the current oxygen concentration;
and controlling the flow and the injection time of the air nozzle in real time according to the difference value between the acquired current oxygen concentration and the acquired required oxygen concentration.
2. The active regeneration assist method for an engine particulate trap as claimed in claim 1, wherein said controlling the flow rate and injection time of said air injector in real time based on the difference between the collected current oxygen concentration and said demanded oxygen concentration comprises:
acquiring the exhaust flow rate of the particle catcher per unit time;
calculating the air amount reaching the required oxygen concentration according to the difference value between the acquired current oxygen concentration and the required oxygen concentration and the exhaust flow;
setting a flow gear of the air nozzle according to the air quantity;
and calculating the injection time for driving the air nozzle according to the air quantity and the flow gear of the air nozzle.
3. The engine particulate trap active regeneration assist method of claim 1, wherein when the particulate trap triggers active regeneration, the required oxygen concentration for the active regeneration is calculated as:
acquiring the current carbon loading of the particle catcher and the inlet temperature of the particle catcher;
calculating the required oxygen concentration for the active regeneration based on the current carbon loading of the particle trap, the inlet temperature of the particle trap, and the required regeneration rate for the active regeneration.
4. The active regeneration assist method for an engine particulate trap as claimed in claim 2, wherein the flow characteristic corresponding to the flow gear of said air nozzle is qKg/h, and said air amount is mdesCalculating to obtain the injection time for driving the air nozzle
5. The engine particulate trap active regeneration assist method of claim 1, further comprising, prior to calculating a required oxygen concentration for active regeneration when the particulate trap triggers active regeneration:
acquiring the accumulated carbon amount of the particle catcher;
judging whether the accumulated carbon amount reaches an accumulated carbon amount threshold value for triggering active regeneration; wherein the accumulated carbon amount threshold is set according to the pressure difference or the original discharge amount of the particle catcher;
triggering active regeneration of the particle trap when the accumulated carbon amount reaches an accumulated carbon amount threshold that triggers active regeneration.
6. An engine particulate trap active regeneration assist device, comprising:
a required oxygen concentration acquisition module for calculating a required oxygen concentration for active regeneration when the particle trap triggers active regeneration;
an oxygen concentration sampling module for sampling a current oxygen concentration at an inlet of the particle trap at a frequency H;
the temperature adjusting module is used for adjusting the temperature in the particle catcher according to the current oxygen concentration so as to ignite and burn the particles in the particle catcher;
and the control module is used for controlling the flow and the injection time of the air nozzle in real time according to the difference value between the acquired current oxygen concentration and the acquired required oxygen concentration.
7. The active regeneration assist device of an engine particulate trap of claim 6, wherein the control module comprises:
an exhaust flow rate acquisition unit for acquiring an exhaust flow rate of the particle trap;
an air amount calculation unit for calculating an air amount that reaches the required oxygen concentration based on the difference between the acquired current oxygen concentration and the required oxygen concentration and the exhaust flow rate;
the flow gear setting unit is used for setting the flow gear of the air nozzle according to the air quantity;
and the injection time calculating unit is used for calculating the injection time for driving the air nozzle according to the air quantity and the flow gear of the air nozzle.
8. The active regeneration assist device of an engine particulate trap as defined in claim 6, wherein the demand oxygen concentration acquisition module specifically comprises:
a data acquisition unit for acquiring the current carbon loading of the particle trap and the inlet temperature of the particle trap;
and the concentration calculating unit is used for calculating the required oxygen concentration of the active regeneration according to the current carbon load of the particle catcher, the inlet temperature of the particle catcher and the regeneration rate required by the active regeneration.
9. A storage medium comprising a stored computer program, wherein the computer program when executed controls an apparatus in which the storage medium is located to perform the method of engine particle trap active regeneration assistance of any one of claims 1 to 5.
10. An engine particulate trap active regeneration assistance system, comprising: an engine management system and an engine particle trap; wherein,
the engine management system executing the engine particulate trap active regeneration assist method of any one of claims 1 to 5;
the engine particle trap includes an air nozzle disposed at the particle trap inlet and an oxygen sensor disposed at the particle trap inlet.
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| CN114000936A (en) * | 2021-10-19 | 2022-02-01 | 重庆长安汽车股份有限公司 | Control method and system for reducing carbon deposition of gasoline particle trap of direct injection engine and computer readable storage medium |
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