CN110748426B - Catalyst rapid ignition method for vehicle, engine assembly and vehicle - Google Patents
Catalyst rapid ignition method for vehicle, engine assembly and vehicle Download PDFInfo
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- CN110748426B CN110748426B CN201910137698.4A CN201910137698A CN110748426B CN 110748426 B CN110748426 B CN 110748426B CN 201910137698 A CN201910137698 A CN 201910137698A CN 110748426 B CN110748426 B CN 110748426B
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- engine
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- rotating speed
- catalyst
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/024—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus
- F02D41/0255—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus to accelerate the warming-up of the exhaust gas treating apparatus at engine start
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/024—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus
- F02D2041/026—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus using an external load, e.g. by increasing generator load or by changing the gear ratio
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a catalyst quick ignition method for a vehicle, an engine assembly and the vehicle, according to the catalyst quick ignition method for the vehicle, a generator is arranged on an engine of the vehicle, and the engine can selectively provide power for the generator, and the catalyst quick ignition method at least comprises the following steps: a starting stage, starting the engine to enable the rotating speed of the engine to reach a preset rotating speed; and in the fast idling stage, stabilizing the rotating speed of the engine at a preset rotating speed for a period of time, and controlling the engine to provide power for the generator. According to the rapid initiation method of the catalyst, the speed of the catalyst reaching the reaction temperature can be increased, the pollutant emission during the cold start of an engine is reduced, and the vehicle is more environment-friendly.
Description
Technical Field
The invention relates to the field of automobiles, in particular to a method for quickly igniting a catalyst of a vehicle, an engine assembly and the vehicle.
Background
With the implementation of the national six standards, the emission regulations become more and more strict, and in order to meet new emission regulations, the catalyst needs to be rapidly ignited. The method for achieving rapid catalyst start is to increase the temperature or heat of exhaust gas reaching the catalyst to allow the catalyst to reach the reaction temperature in a short time, thereby reducing the emission of pollutants during cold start. In the related art, the heat energy reaching the catalyst is increased by increasing the high-temperature exhaust gas by retarding the ignition timing and increasing the idle speed of the engine, but the amount of retardation of the ignition timing is limited by the influence of combustion stability, and the increase of the idle speed of the engine is limited by the influence of safety, noise, and the like.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide a catalyst rapid light-off method for a vehicle, which can increase the speed at which a catalyst reaches a reaction temperature, reduce pollutants discharged when an engine is cold started, and make the vehicle more environment-friendly.
The invention also provides an engine assembly adopting the catalyst rapid ignition method.
The invention also provides a vehicle adopting the rapid light-off method of the catalytic converter.
According to the catalyst rapid ignition method for the vehicle, the engine of the vehicle is provided with the generator and the generator can be selectively powered by the engine, and the catalyst rapid ignition method at least comprises the following steps: a starting stage, starting the engine to enable the rotating speed of the engine to reach a preset rotating speed; and in the fast idling stage, stabilizing the rotating speed of the engine at a preset rotating speed for a period of time, and controlling the engine to provide power for the generator.
According to the catalyst quick ignition method for the vehicle, the engine is driven to drive the generator to generate electricity to improve the load of the engine in the quick starting stage of the engine, the exhaust gas displacement of the engine is improved by increasing the load of the engine, the catalyst can be quickly heated by increasing the exhaust gas displacement, and the catalyst reaches the catalytic temperature.
According to one embodiment of the invention, during the starting phase, the engine speed is controlled to decrease to the preset speed after reaching a maximum value.
According to one embodiment of the invention, the preset rotation speed is 1000rpm to 1400 rpm.
According to one embodiment of the invention, the power generation of the generator is gradually increased during the fast idle phase until a maximum power generation is reached.
According to one embodiment of the invention, the power generation of the generator is gradually decreased after maintaining the maximum power generation for a period of time during the fast idle phase.
According to an embodiment of the present invention, the catalyst rapid light-off method further includes: during the idle phase, the engine speed drops to a conventional idle speed.
According to one embodiment of the invention, said normal idle speed is between 500rpm and 1000 rpm.
According to one embodiment of the invention the duration of the start-up phase is 4s-6s and the duration of the fast idle phase is 10s-16 s. The engine assembly according to the present invention is briefly described below.
The engine assembly according to the present invention is briefly described below.
The engine assembly comprises an engine and a generator arranged on the engine, wherein the engine is connected with the generator to increase the load of the engine in the starting process of the engine, the generator can be an integrated starting generator, the integrated starting generator is integrated with a disc type motor arranged on a main driving shaft of the engine, the temperature of a catalyst can be rapidly increased in the starting process of the engine assembly, few pollutants are discharged in cold starting, and the engine assembly is stable in performance and high in reliability.
The vehicle according to the present invention is briefly described below.
According to the vehicle adopting the rapid light-off method for the catalyst of the vehicle, the catalyst can quickly reach the reaction temperature after the vehicle is in cold start, pollutants discharged after the vehicle is in cold start are reduced, the vehicle is more environment-friendly, and the requirements of emission regulations can be met.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a flow chart of a method for rapid catalyst light-off for a vehicle according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of the engine speed, the generator power generation amount, and the amount of exhaust gas discharged during the engine start according to the embodiment of the invention.
Reference numerals:
1 is the engine speed, 2 is the exhaust emission when the generator is not generating electricity, 3 is the exhaust emission of the engine when the catalyst rapid light-off method of the present invention is employed, and 4 is the amount of electricity generated by the generator.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
A catalyst rapid light-off method for a vehicle according to an embodiment of the present invention will be described with reference to fig. 1 to 2.
According to the invention, the vehicle is provided with the generator, and the engine can selectively provide power for the generator, and the rapid catalyst light-off method comprises at least the following steps: starting the engine to make the rotation speed of the engine reach a preset rotation speed; and in the fast idling stage, the rotating speed of the engine is stabilized at a preset rotating speed for a period of time, and the engine is controlled to provide power for the generator.
The emission regulation of the engine is more and more strict, in order to ensure that the engine meets new emission standards and reduce the emission of vehicle pollutants, the catalyst needs to be quickly ignited, and the method for realizing the quick ignition of the catalyst is to increase the temperature or heat of exhaust gas reaching the catalyst and enable the catalyst to reach the temperature capable of catalyzing tail gas in a short time, so that the emission pollutants during the cold start of the vehicle are reduced.
In the related art, in order to quickly initiate combustion of the catalyst, one method is to retard the ignition timing, but the amount of retardation of the ignition timing is affected by combustion stability, and at the same time, retarding the ignition timing may cause the engine to fail to operate normally; another method is to increase the idle speed of the engine, but increasing the idle speed may affect the safety of the engine, and increasing the idle speed of the engine may increase the noise of the vehicle.
According to the rapid catalyst light-off method, the generator starts to work in the fast idling stage, the engine provides power for the generator, the load of the engine is improved, the fuel injection quantity of the engine is further improved, the engine can generate more waste gas, the heat reaching the catalyst can be improved due to the increase of the waste gas, the temperature of the catalyst can be rapidly improved due to a large amount of waste gas, and the purpose of rapid light-off of the zero catalyst is further achieved.
In the starting stage, the engine can gradually increase the rotating speed under the driving of the starting motor, so that the rotating speed of the engine reaches the preset rotating speed in the starting stage, the generator does not work in the starting stage, the engine gradually and stably runs after entering the fast idling stage, the generator gradually starts to work after the rotating speed of the engine is stabilized at the preset rotating speed for a period of time, the engine provides power for the generator, the load of the engine is increased in the power generation process of the generator, the fuel injection quantity of the engine can be adjusted by a sensor of the engine after the load of the engine is increased, the larger the load is, the more the exhaust gas quantity is generated, the exhaust gas quantity discharged by the engine can be increased by increasing the load of the engine, the heating speed of the exhaust gas to the catalyst is higher, and the heat quantity received by the catalyst in unit time is greatly increased, the catalyst can quickly reach the required reaction temperature, and the catalyst can effectively catalyze the waste gas generated by the engine to reduce the emission of pollutants.
According to the catalyst quick ignition method for the vehicle, the engine is driven to drive the generator to generate electricity to improve the load of the engine in the quick starting stage of the engine, the exhaust gas displacement of the engine is improved by increasing the load of the engine, the catalyst can be quickly heated by increasing the exhaust gas displacement, and the catalyst reaches the catalytic temperature.
According to one embodiment of the invention, in the starting stage, the rotating speed of the engine is controlled to be reduced to the preset rotating speed after reaching the maximum value, the preset rotating speed is 1000-1400 rpm, the engine does not work on the generator in the starting stage, the operation of the engine is in the initial stage at the moment, the operation of the engine in the starting stage does not completely reach a stable state, the operation of the engine is unstable at the moment, and if the engine provides power for the generator at the moment, the engine can shake to influence the starting of the engine, so that the engine does not provide power for the generator at the end of the starting stage.
According to one embodiment of the invention, the preset rotating speed of the engine is 1200rpm, the rotating speed of the engine gradually tends to be stable in the fast idling stage, but the rotating speed of the engine still has certain fluctuation, the preset rotating speed is set to 1200rpm, the engine can be ensured to rapidly enter a stable running state in the fast idling stage, and the time of the engine entering the stable stage is shortened; the preset rotating speed of the engine is set to 1200rpm, the load of the engine and the increased load of the generator driven by the engine at the rotating speed can ensure that the exhaust gas discharged by the engine can quickly heat the catalytic converter, so that the catalytic converter is quickly heated and reaches the reaction temperature, pollutants discharged when a vehicle is in cold start are reduced, and the environmental protection performance of the vehicle is improved.
According to an embodiment of the invention, during the fast idle stage, the power generation amount of the generator is gradually increased until the maximum power generation amount is reached, the power generation amount superior to the power generation amount of the generator is gradually increased, the power of the engine driving the generator to do work is also gradually increased, the load of the engine is gradually increased during the fast idle stage, the stable operation of the engine during the fast idle stage can be ensured instead of increasing the load of the engine within a very short time, if the load of the engine is increased within a very short time, the fuel injection amount of the engine is likely to be instantly increased, the combustion stability of the engine is likely to be affected after the fuel injection amount of the engine is increased, the combustion of the engine is likely to be incomplete, and the engine is likely to greatly vibrate to affect the work of the engine, so that the power generation amount of the generator during the fast idle stage adopts a mode of gradually increasing until the maximum power generation amount is reached, the running stability of the engine can be ensured, and the vibration of the engine can be reduced.
According to one embodiment of the invention, during the fast idling stage, the power generation amount of the generator is gradually reduced after the maximum power generation amount is kept for a period of time, the generator reaches the maximum power generation amount during the fast idling stage to improve the load of the engine, after the temperature of the catalyst reaches the temperature at which reaction can occur, a large exhaust gas displacement is not needed any more, at the moment, the engine does not provide power for the generator any more, the generator stops working to reduce the load of the engine, and the engine enters the normal idling stage to reduce the oil consumption of the vehicle.
According to one embodiment of the invention, the method for rapid catalyst light-off for a vehicle further comprises an idle stage, after the idle stage, the working state and the rotating speed of the engine are gradually stabilized in the idle stage, the engine does not provide power for the generator any more, the load of the engine is reduced, and the rotating speed of the engine is gradually reduced to the rotating speed of the engine at the normal idle speed.
Wherein the normal idle speed of the engine is 500rpm-1000rpm, and according to one embodiment of the invention, the normal idle speed of the engine is 750rpm, and during the idle stage, the load of the engine is reduced, and the exhaust gas volume is reduced to the normal level.
According to one embodiment of the invention, the duration of the starting phase is 4s-6s, the duration of the fast idling phase is 10s-16s, according to a specific embodiment of the invention, the starting phase is a time period of 0s-5s after the engine is started, the fast idling phase is a time period of 5s-18s after the engine is started, and in the U.S. FTP driving cycle, after 20 seconds, the vehicle is started, so the end time of the fast idling phase is set at 18 seconds, the generator is stopped generating power, 2-3 seconds of preparation time for engaging a gear and the like are left for a driver, and the running state of the vehicle is ensured to be stable.
According to one embodiment of the invention, the battery connected with the generator is in an unsaturated state when being started, so that the electric energy generated by the generator can be ensured to stably charge the battery, and the circuit between the generator and the battery is ensured to be stable.
The engine assembly according to the present invention is briefly described below.
The engine assembly comprises an engine and a generator arranged on the engine, wherein the engine is connected with the generator to increase the load of the engine in the starting process of the engine, the generator can be an integrated starting generator, the integrated starting generator is integrated with a disc type motor arranged on a main driving shaft of the engine, the temperature of a catalyst can be rapidly increased in the starting process of the engine assembly, few pollutants are discharged in cold starting, and the engine assembly is stable in performance and high in reliability.
The vehicle according to the present invention is briefly described below.
According to the vehicle adopting the rapid light-off method for the catalyst of the vehicle, the catalyst can quickly reach the reaction temperature after the vehicle is in cold start, pollutants discharged after the vehicle is in cold start are reduced, the vehicle is more environment-friendly, and the requirements of emission regulations can be met.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (3)
1. A catalyst rapid light-off method for a vehicle having an engine with a generator disposed thereon and selectively powered by the generator, characterized by comprising at least the steps of:
a starting stage, starting the engine to enable the rotating speed of the engine to reach a preset rotating speed;
in the fast idling stage, stabilizing the rotating speed of the engine at a preset rotating speed for a period of time, and simultaneously controlling the engine to provide power for the generator;
in the starting stage, controlling the rotating speed of the engine to be reduced to the preset rotating speed after reaching the maximum value;
during the fast idling stage, the power generation amount of the generator is gradually increased until the maximum power generation amount is reached;
during the fast idling stage, the power generation amount of the generator is gradually reduced after the power generation amount of the generator keeps the maximum power generation amount for a period of time;
the preset rotating speed is 1000rpm-1400 rpm;
in the idling stage, the rotating speed of the engine is reduced to the conventional idling speed;
the conventional idle speed is 500rpm-1000 rpm;
the duration of the starting phase is 4s-6s, and the duration of the fast idling phase is 10s-16 s;
the battery connected to the generator is in an unsaturated state at start-up.
2. An engine assembly, comprising: an engine and a generator provided on the engine, during the starting of the engine, the rapid light-off method of the catalyst for the vehicle as claimed in claim 1 is used for starting, and the engine is connected with the generator to raise the load of the engine.
3. A vehicle characterized by comprising the catalyst rapid light-off method as recited in claim 1.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910137698.4A CN110748426B (en) | 2019-02-25 | 2019-02-25 | Catalyst rapid ignition method for vehicle, engine assembly and vehicle |
| PCT/CN2020/076376 WO2020173406A1 (en) | 2019-02-25 | 2020-02-24 | Fast catalytic converter light-off method for vehicle, engine assembly, and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910137698.4A CN110748426B (en) | 2019-02-25 | 2019-02-25 | Catalyst rapid ignition method for vehicle, engine assembly and vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110748426A CN110748426A (en) | 2020-02-04 |
| CN110748426B true CN110748426B (en) | 2021-08-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910137698.4A Active CN110748426B (en) | 2019-02-25 | 2019-02-25 | Catalyst rapid ignition method for vehicle, engine assembly and vehicle |
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| Country | Link |
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| CN (1) | CN110748426B (en) |
| WO (1) | WO2020173406A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110748426B (en) * | 2019-02-25 | 2021-08-20 | 长城汽车股份有限公司 | Catalyst rapid ignition method for vehicle, engine assembly and vehicle |
| CN111305935B (en) * | 2020-04-09 | 2021-10-29 | 东风汽车集团有限公司 | Method for accelerating ignition process of catalytic converter by using lowest rotating speed of engine |
| CN111878229A (en) * | 2020-06-30 | 2020-11-03 | 东风汽车集团有限公司 | Gasoline engine cold start emission reduction monitoring method and system |
| CN113147730B (en) * | 2021-04-27 | 2022-10-14 | 浙江吉利控股集团有限公司 | Vehicle control method, device and computer storage medium |
| CN114412651B (en) * | 2021-11-01 | 2023-04-18 | 东风汽车集团股份有限公司 | Hybrid vehicle and control method and control device for ignition of catalyst thereof |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19909797A1 (en) * | 1999-03-05 | 2000-09-07 | Bayerische Motoren Werke Ag | Process for faster catalyst heating |
| JP4013594B2 (en) * | 2002-03-05 | 2007-11-28 | 日産自動車株式会社 | Engine idling control device |
| JP4410454B2 (en) * | 2002-04-03 | 2010-02-03 | 三菱自動車工業株式会社 | Idle speed control device for internal combustion engine |
| JP2004245121A (en) * | 2003-02-13 | 2004-09-02 | Nissan Motor Co Ltd | Engine starter |
| JP2010163931A (en) * | 2009-01-14 | 2010-07-29 | Fuji Heavy Ind Ltd | Control device of engine |
| JP6549861B2 (en) * | 2015-03-10 | 2019-07-24 | 株式会社Ｓｕｂａｒｕ | Automobile |
| CN108223181B (en) * | 2017-12-20 | 2020-03-17 | 中国第一汽车股份有限公司 | Cold start emission reduction strategy monitoring system |
| CN110748426B (en) * | 2019-02-25 | 2021-08-20 | 长城汽车股份有限公司 | Catalyst rapid ignition method for vehicle, engine assembly and vehicle |
-
2019
- 2019-02-25 CN CN201910137698.4A patent/CN110748426B/en active Active
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2020
- 2020-02-24 WO PCT/CN2020/076376 patent/WO2020173406A1/en active Application Filing
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| Publication number | Publication date |
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| WO2020173406A1 (en) | 2020-09-03 |
| CN110748426A (en) | 2020-02-04 |
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