CN111237102B - Engine system and control method - Google Patents
Engine system and control method Download PDFInfo
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- CN111237102B CN111237102B CN202010102502.0A CN202010102502A CN111237102B CN 111237102 B CN111237102 B CN 111237102B CN 202010102502 A CN202010102502 A CN 202010102502A CN 111237102 B CN111237102 B CN 111237102B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
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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
- F01N3/24—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 constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
- F02B29/04—Cooling of air intake supply
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
- F02B37/02—Gas passages between engine outlet and pump drive, e.g. reservoirs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/02—EGR systems specially adapted for supercharged engines
- F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/1015—Air intakes; Induction systems characterised by the engine type
- F02M35/10157—Supercharged engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/10209—Fluid connections to the air intake system; their arrangement of pipes, valves or the like
- F02M35/10222—Exhaust gas recirculation [EGR]; Positive crankcase ventilation [PCV]; Additional air admission, lubricant or fuel vapour admission
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Exhaust-Gas Circulating Devices (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention relates to the field of automobile power, and discloses an engine system and a control method. The engine system comprises an air inlet pipeline, an exhaust pipeline and a heat-preservation air storage tank, wherein a first communicating port, a second communicating port and a third communicating port are arranged on the heat-preservation air storage tank, the first communicating port is connected to the air inlet pipeline at the upper part of the air compressor through a first connecting pipeline, the second communicating port is connected to the exhaust pipeline between the turbine and the exhaust regulating valve through a second connecting pipeline, and the third communicating port is connected to the exhaust pipeline between the exhaust regulating valve and the temperature sensor through a third connecting pipeline. According to the invention, low-temperature exhaust gas in front of the three-way catalyst is introduced into the heat-preservation gas storage tank when the engine is in cold start, the low-temperature exhaust gas can be used as low-pressure EGR while emission is reduced, oil consumption is reduced, high-temperature and low-emission gas stored after the three-way catalyst is stopped for the last time is led out to the front of the three-way catalyst, the temperature of the three-way catalyst is increased, the ignition time of the three-way catalyst is shortened, and cold start emission is reduced.
Description
Technical Field
The invention relates to the field of automobile power, in particular to an engine system and a control method.
Background
With the strictness of emission regulations and oil consumption regulations, energy conservation and emission reduction become the primary targets of the development of the current engines. The temperature of the engine is low when the engine is in cold start, the oil and gas mixture is not uniform, and the fuel cannot be fully combusted, so that the fuel consumption and the HC emission are increased. Insufficient combustion also results in lower exhaust temperature, failure of the three-way catalyst to reach light-off temperature quickly, and poor conversion efficiency. Research has shown that HC and CO emissions generated during the cold start phase account for 50% -80% of the emissions throughout the emissions test procedure.
In the prior art, in order to increase the exhaust temperature and the temperature of the three-way catalyst, a method of increasing the circulating fuel injection amount, reducing the ignition advance angle and the like is generally adopted in a cold start stage, but the emission amounts of HC and CO are increased due to the enrichment of a mixed gas. Or the three-way catalyst is heated by the storage battery, but the power consumption is large, and the storage battery is easy to feed power. EGR (Exhaust Gas recirculation) technology is also one of the means for reducing the fuel consumption of an engine, and by introducing cooled Exhaust Gas into a cylinder, the tendency to knock is reduced, and better combustion is obtained, thereby reducing fuel consumption. However, because of the high exhaust temperature, EGR cooling often suffers from insufficient cooling capacity or the occurrence of condensed water.
Disclosure of Invention
Based on the above problems, an object of the present invention is to provide an engine system and a control method thereof, which can rapidly increase the exhaust temperature and the temperature of a three-way catalyst at the cold start stage, and reduce the emission and the oil consumption.
In order to achieve the purpose, the invention adopts the following technical scheme:
an engine system, comprising:
the air inlet pipeline is connected with an air inlet manifold of the engine, and a compressor and an air inlet intercooler are sequentially arranged on the air inlet pipeline along the air inlet direction;
the exhaust pipeline is connected with an exhaust manifold of the engine, and a turbine, an exhaust regulating valve, a temperature sensor and a three-way catalyst are sequentially arranged on the exhaust pipeline along the exhaust direction;
the heat preservation gas holder, be provided with first intercommunication mouth, second intercommunication mouth and third intercommunication mouth on the heat preservation gas holder, first intercommunication mouth through first connecting tube connect in the compressor upper reaches intake pipe is last, the second intercommunication mouth through second connecting tube connect in the turbine with between the exhaust control valve exhaust pipe is last, the third intercommunication mouth through third connecting tube connect in exhaust control valve with between the temperature sensor exhaust pipe is last.
As a preferable aspect of the engine system of the present invention, a plurality of partitions are disposed in the heat-insulating air tank in a staggered manner, and the plurality of partitions divide a space in the heat-insulating air tank into S-shaped channels.
As a preferable aspect of the engine system of the present invention, an EGR intercooler and an EGR regulator valve are provided on the first connection pipe.
In a preferred embodiment of the engine system of the present invention, a first on-off valve is provided in the second connection line.
In a preferred embodiment of the engine system of the present invention, a second on-off valve is provided on the third connection line.
As a preferable aspect of the engine system of the present invention, the engine system further includes a fourth connecting line, one end of the fourth connecting line is connected to the exhaust pipe downstream of the three-way catalyst, and the other end of the fourth connecting line is connected to the first connecting line upstream of the first on-off valve.
In a preferred embodiment of the engine system of the present invention, a third on/off valve is provided in the fourth connection line.
An engine control method using the engine system as described above, comprising:
s1, acquiring the starting time of the engine, the rotating speed of the engine, the upstream temperature of the three-way catalyst, the vehicle speed and the pressure in the heat-preservation air storage tank;
s2, judging whether the engine starting time is smaller than a preset time value, if so, jumping to a step S3, and if not, jumping to a step S5;
s3, judging whether the upstream temperature of the three-way catalyst is smaller than a preset temperature value, if so, jumping to S4, and if not, jumping to S5;
s4, opening the first switch valve, the second switch valve and the exhaust gas regulating valve, closing the third switch valve and the EGR regulating valve, and jumping to the step S2;
s5, judging whether the EGR requirement is larger than 0, if so, jumping to a step S6, and if not, jumping to a step S7;
s6, opening the EGR regulating valve, and jumping to the step S5;
s7, judging whether the vehicle speed is less than a preset vehicle speed value, the engine speed is greater than 0 and the upstream temperature of the three-way catalyst is greater than a preset temperature value, if so, jumping to the step S8, and if not, jumping to the step S10;
s8, closing the EGR regulating valve and the second switch valve, opening the third switch valve and the first switch valve, fully opening the exhaust regulating valve, and going to the step S9;
s9, judging whether the pressure in the heat-preservation air storage tank is larger than or equal to a preset pressure value, if so, jumping to the step S10, and if not, jumping to the step S7;
and S10, ending.
As a preferable aspect of the engine control method of the present invention, the preset time value is 30s, and the preset temperature value is 350 ℃.
As a preferable scheme of the engine control method, the preset vehicle speed value is 5km/h, and the preset pressure value is 1.1 bar.
The invention has the beneficial effects that:
the invention provides an engine system and a control method, wherein an air inlet pipeline is connected with an air inlet manifold of an engine, and an air compressor and an air inlet intercooler are sequentially arranged on the air inlet pipeline along the air inlet direction; the exhaust pipeline is connected with an exhaust manifold of the engine, and a turbine, an exhaust regulating valve, a temperature sensor and a three-way catalyst are sequentially arranged on the exhaust pipeline along the exhaust direction; the heat preservation gas storage tank is provided with a first communicating port, a second communicating port and a third communicating port, the first communicating port is connected to a gas inlet pipeline at the upper part of the gas compressor through a first connecting pipeline, the second communicating port is connected to a gas exhaust pipeline between the turbine and the gas exhaust regulating valve through a second connecting pipeline, and the third communicating port is connected to the gas exhaust pipeline between the gas exhaust regulating valve and the temperature sensor through a third connecting pipeline. By the design of the air inlet pipeline and the exhaust pipeline and the arrangement of the heat-preservation gas storage tank, low-temperature exhaust gas in front of the three-way catalyst is introduced into the heat-preservation gas storage tank when the engine is in cold start, and high-temperature and low-emission gas stored before the engine is stopped for the last time after the three-way catalyst is led out to the front of the three-way catalyst, so that the temperature of the three-way catalyst is increased, the ignition time of the three-way catalyst is shortened, cold start emission is reduced, and meanwhile, the stored low-temperature exhaust gas can be used as EGR to be led into a cylinder, so that the oil consumption is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
FIG. 1 is a schematic illustration of an engine system (first state) provided in accordance with an embodiment of the present invention;
FIG. 2 is a partial schematic illustration of an engine system provided in accordance with an embodiment of the present invention;
FIG. 3 is a schematic illustration of an engine system (second state) provided in accordance with an embodiment of the present invention;
FIG. 4 is a schematic representation of an engine system (third state) provided in accordance with an embodiment of the present invention;
FIG. 5 is a schematic illustration of an engine system (fourth state) provided in accordance with an embodiment of the present invention;
FIG. 6 is a schematic illustration of an engine system (fifth state) provided in accordance with an embodiment of the present invention;
fig. 7 is a flowchart of an engine control method according to an embodiment of the present invention.
In the figure:
1-an air inlet pipeline; 2-an exhaust pipeline; 3-heat preservation and air storage tank; 4-a first connecting line; 5-a second connecting line; 6-a third connecting pipeline; 7-a fourth connecting line;
11-a compressor; 12-an intake intercooler;
21-a turbine; 22-exhaust gas regulating valve; 23-a temperature sensor; 24-three-way catalyst;
31-a first communication port; 32-a second communication port; 33-a third communication port; 34-a separator; 35-a pressure sensor;
41-EGR intercooler; 42-EGR regulator valve;
51-a first on-off valve;
61-a second on-off valve;
71-a third on-off valve;
100-an intake manifold; 200-an exhaust manifold; 300-oil injection system.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The present embodiment provides an engine system, as shown in fig. 1 to 6, which includes an intake line 1, an exhaust line 2, and a heat-retaining air tank 3. The engine system further includes an intake manifold 100, an exhaust manifold 200, and a fuel injection system 300 of the engine.
As shown in fig. 1, an intake pipeline 1 is connected to an intake manifold 100 of an engine, and a compressor 11 and an intake intercooler 12 are sequentially disposed on the intake pipeline 1 along an intake direction. The exhaust pipeline 2 is connected with an exhaust manifold 200 of the engine, a turbine 21, an exhaust regulating valve 22, a temperature sensor 23 and a three-way catalyst 24 are sequentially arranged on the exhaust pipeline 2 along the exhaust direction, and the turbine 21 is connected with the compressor 11 through a connecting shaft. As shown in fig. 2, the heat-retaining air tank 3 is provided with a first communication port 31, a second communication port 32, and a third communication port 33, the first communication port 31 is connected to the intake line 1 upstream of the compressor 11 via a first connection line 4, the second communication port 32 is connected to the exhaust line 2 between the turbine 21 and the exhaust gas control valve 22 via a second connection line 5, and the third communication port 33 is connected to the exhaust line 2 between the exhaust gas control valve 22 and the temperature sensor 23 via a third connection line 6.
Through the design of the air inlet pipeline 1 and the exhaust pipeline 2 and the arrangement of the heat-preservation gas storage tank 3, low-temperature exhaust gas in front of the three-way catalyst 24 is introduced into the heat-preservation gas storage tank 3 when the engine is in cold start, and high-temperature and low-emission gas stored in front of the three-way catalyst 24 before the engine is stopped for the last time is led out to the front of the three-way catalyst 24, so that the temperature of the three-way catalyst 24 is increased, the ignition time of the three-way catalyst is shortened, the cold start emission is reduced, and the stored low-temperature exhaust gas can be used as.
As shown in fig. 1, to facilitate adjustment of an EGR (Exhaust Gas recirculation) rate, an EGR intercooler 41 and an EGR adjustment valve 42 are optionally provided on the first connection line 4. The EGR rate is adjusted by controlling the opening degree of the EGR adjustment valve 42. In order to facilitate the on/off control of the second connecting line 5, optionally, a first on/off valve 51 is provided on the second connecting line 5. In order to facilitate the on-off control of the third connecting line 6, optionally, a second on-off valve 61 is provided on the third connecting line 6. The engine system further includes a fourth connecting line 7, one end of the fourth connecting line 7 being connected to the exhaust line 2 downstream of the three-way catalyst 24, and the other end of the fourth connecting line 7 being connected to the first connecting line 4 upstream of the first on-off valve 51. In order to facilitate the on-off control of the fourth connecting line 7, optionally, a third on-off valve 71 is disposed on the fourth connecting line 7.
As shown in fig. 2, in order to extend and define the medium flow path in the heat-retaining air tank 3, a plurality of partition plates 34 are optionally staggered in the heat-retaining air tank 3, and the plurality of partition plates 34 divide the space in the heat-retaining air tank 3 into S-shaped passages. In this embodiment, a pressure sensor 35 is provided in the heat-insulating gas tank 3, so as to obtain the pressure in the heat-insulating gas tank 3 according to the control requirement.
To facilitate understanding of the engine system, the following application examples are given:
as shown in fig. 3, the exhaust gas regulating valve 22 is fully opened, and the EGR regulating valve 42, the first switch valve 51, the second switch valve 61, and the third switch valve 71 are all in a closed state, at this time, intake air enters the intake manifold 100 only through the intake line 1, and exhaust gas is discharged only through the exhaust line 2;
as shown in fig. 4, when the engine is in a cold start stage, the EGR regulating valve 42 is closed, the exhaust regulating valve 22 is closed, the first switch valve 51 and the second switch valve 61 are both in an open state, and the third switch valve 71 is in a closed state, at this time, cold start exhaust gas enters the heat-preserving gas storage tank 3 through the second connecting pipeline 5, and high-temperature gas in the tank is discharged into the three-way catalyst 24 through the third connecting pipeline 6;
as shown in fig. 5, the EGR control valve 42 and the exhaust control valve 22 are both in an open state, and the first switch valve 51, the second switch valve 61 and the third switch valve 71 are all in a closed state, at this time, the gas in the heat-preserving gas tank 3 enters the cylinder to form EGR;
as shown in fig. 6, when the EGR control valve 42 is closed, the exhaust control valve 22 is opened, the first on-off valve 51 and the third on-off valve 71 are opened, and the second on-off valve 61 is closed, the exhaust gas after the high-temperature treatment by the three-way catalyst 24 enters the heat-retaining gas tank 3 through the fourth connecting pipe 7 and the second connecting pipe 5.
The engine system that this embodiment provided, through the design of air inlet pipeline 1, exhaust pipe 2 and the arrangement of heat preservation gas holder 3, introduce the low temperature exhaust before three way catalyst converter 24 into heat preservation gas holder 3 when the engine cold start to lead out the high temperature behind the three way catalyst converter 24 that the storage was stopped before last, low exhaust gas before 24 to three way catalyst converter, improve three way catalyst converter 24 temperature, shorten its time of initiating combustion, reduce cold start emission, the low temperature exhaust of while storage can be used as EGR and lead in the jar, thereby reduce the oil consumption.
The present embodiment also provides an engine control method using the engine system described above, as shown in fig. 7, the engine control method including:
s1, acquiring the engine starting time, the engine speed, the upstream temperature of the three-way catalyst 24, the vehicle speed and the pressure in the heat-preservation air storage tank 3;
s2, judging whether the engine starting time is smaller than a preset time value, if so, jumping to a step S3, and if not, jumping to a step S5;
s3, judging whether the upstream temperature of the three-way catalyst 24 is smaller than a preset temperature value, if so, jumping to the step S4, and if not, jumping to the step S5;
s4, opening the first switching valve 51, the second switching valve 61 and the exhaust gas regulating valve 22, closing the third switching valve 71 and the EGR regulating valve 42, and proceeding to step S2;
s5, judging whether the EGR requirement is larger than 0, if so, jumping to a step S6, and if not, jumping to a step S7;
s6, opening the EGR regulating valve 42, and jumping to the step S5;
s7, judging whether the vehicle speed is less than a preset vehicle speed value, the engine speed is greater than 0 and the upstream temperature of the three-way catalyst 24 is greater than a preset temperature value, if so, jumping to a step S8, and if not, jumping to a step S10;
s8, closing the EGR adjustment valve 42 and the second switch valve 61, opening the third switch valve 71 and the first switch valve 51, fully opening the exhaust gas adjustment valve 22, and proceeding to step S9;
s9, judging whether the pressure in the heat-preservation air storage tank 3 is larger than or equal to a preset pressure value, if so, jumping to the step S10, and if not, jumping to the step S7;
and S10, ending.
In the embodiment, in order to meet the automobile starting requirement under the general condition, the preset time value is 30s, the preset temperature value is 350 ℃, the preset vehicle speed value is 5km/h, and the preset pressure value is 1.1 bar.
According to the engine control method provided by the embodiment, when the engine is in cold start, low-temperature exhaust gas before the three-way catalyst 24 is introduced into the heat-preservation gas storage tank 3, and high-temperature and low-emission gas stored before the last stop of the engine after the three-way catalyst 24 is led out to the front of the three-way catalyst 24, so that the temperature of the three-way catalyst 24 is increased, the ignition time of the three-way catalyst is shortened, the cold start emission is reduced, and meanwhile, the stored low-temperature exhaust gas can be used as EGR to be led into a cylinder, so.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments illustrated herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (4)
1. An engine control method for controlling an engine system, the engine system comprising:
the engine air inlet system comprises an air inlet pipeline (1) connected with an air inlet manifold (100) of the engine, wherein an air compressor (11) and an air inlet intercooler (12) are sequentially arranged on the air inlet pipeline (1) along an air inlet direction;
the exhaust pipeline (2) is connected with an exhaust manifold (200) of the engine, and a turbine (21), an exhaust regulating valve (22), a temperature sensor (23) and a three-way catalyst (24) are sequentially arranged on the exhaust pipeline (2) along the exhaust direction;
a heat-preservation gas storage tank (3), the heat-preservation gas storage tank (3) is provided with a first communicating port (31), a second communicating port (32) and a third communicating port (33), the first communicating port (31) is connected with the gas compressor (11) at the upper stream through a first connecting pipeline (4), the second communicating port (32) is connected with the exhaust pipeline (2) between the turbine (21) and the exhaust regulating valve (22) through a second connecting pipeline (5), the third communicating port (33) is connected with the exhaust regulating valve (22) and the exhaust pipeline (2) between the temperature sensors (23) through a third connecting pipeline (6), the first connecting pipeline (4) is provided with an EGR intercooler (41) and an EGR regulating valve (42), the second connecting pipeline (5) is provided with a first switch valve (51), a second switch valve (61) is arranged on the third connecting pipeline (6);
a fourth connecting pipeline (7), one end of the fourth connecting pipeline (7) is connected to the exhaust pipeline (2) at the downstream of the three-way catalyst (24), the other end of the fourth connecting pipeline (7) is connected to the first connecting pipeline (4) at the upstream of the first switch valve (51), and a third switch valve (71) is arranged on the fourth connecting pipeline (7);
the engine control method includes the steps of:
s1, acquiring the starting time of the engine, the rotating speed of the engine, the upstream temperature of the three-way catalyst (24), the vehicle speed and the pressure in the heat-preserving air storage tank (3);
s2, judging whether the engine starting time is smaller than a preset time value, if so, jumping to a step S3, and if not, jumping to a step S5;
s3, judging whether the upstream temperature of the three-way catalyst (24) is smaller than a preset temperature value, if so, jumping to the step S4, and if not, jumping to the step S5;
s4, opening the first switch valve (51), the second switch valve (61) and the exhaust gas regulating valve (22), closing the third switch valve (71) and the EGR regulating valve (42), and jumping to the step S2;
s5, judging whether the EGR requirement is larger than 0, if so, jumping to a step S6, and if not, jumping to a step S7;
s6, opening the EGR regulating valve (42), and jumping to the step S5;
s7, judging whether the vehicle speed is less than a preset vehicle speed value, the engine speed is greater than 0 and the upstream temperature of the three-way catalyst (24) is greater than a preset temperature value, if so, jumping to the step S8, and if not, jumping to the step S10;
s8, closing the EGR regulating valve (42) and the second switch valve (61), opening the third switch valve (71) and the first switch valve (51), fully opening the exhaust regulating valve (22), and going to the step S9;
s9, judging whether the pressure in the heat-preservation air storage tank (3) is larger than or equal to a preset pressure value, if so, jumping to the step S10, and if not, jumping to the step S7;
and S10, ending.
2. The engine control method according to claim 1, characterized in that the preset time value is 30s and the preset temperature value is 350 ℃.
3. The engine control method according to claim 1, characterized in that the preset vehicle speed value is 5km/h and the preset pressure value is 1.1 bar.
4. The engine control method according to claim 1, characterized in that a plurality of partitions (34) are provided in the heat-retaining air tank (3) in a staggered manner, and the plurality of partitions (34) divide a space in the heat-retaining air tank (3) into S-shaped passages.
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| CN112302768A (en) * | 2020-11-03 | 2021-02-02 | 潍柴动力股份有限公司 | System and method for improving cold start discharge performance of gas engine |
| CN112796909A (en) * | 2021-01-19 | 2021-05-14 | 中国第一汽车股份有限公司 | Engine assembly and vehicle with low pressure EGR system |
| CN113417777B (en) * | 2021-07-31 | 2023-03-28 | 重庆长安汽车股份有限公司 | Engine air inlet heating device |
| CN113803176B (en) * | 2021-09-24 | 2023-06-23 | 潍柴动力股份有限公司 | Control method of natural gas engine, engine system and vehicle |
| CN115219206B (en) * | 2022-08-31 | 2023-02-17 | 中国航发四川燃气涡轮研究院 | Engine cold and hot dipping system for high and low temperature starting test of aircraft engine |
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