CN112302768A - System and method for improving cold start discharge performance of gas engine - Google Patents
System and method for improving cold start discharge performance of gas engine Download PDFInfo
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- CN112302768A CN112302768A CN202011209828.XA CN202011209828A CN112302768A CN 112302768 A CN112302768 A CN 112302768A CN 202011209828 A CN202011209828 A CN 202011209828A CN 112302768 A CN112302768 A CN 112302768A
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- Prior art keywords
- engine
- gas
- exhaust
- air
- cold start
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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
- F01N3/08—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
- F01N3/30—Arrangements for supply of additional air
- F01N3/34—Arrangements for supply of additional air using air conduits or jet air pumps, e.g. near the engine exhaust port
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/22—Control of additional air supply only, e.g. using by-passes or variable air pump drives
- F01N3/225—Electric control of additional air supply
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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
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/10—Carbon or carbon oxides
-
- 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
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/12—Hydrocarbons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
- F01N2900/1404—Exhaust gas temperature
Abstract
The invention discloses a system for improving cold start emission performance of a gas engine, which comprises an engine, wherein a turbine is arranged on an exhaust pipeline of the engine, a catalyst is arranged at the rear end of the turbine, and an air injection system is arranged on the exhaust pipeline between the turbine and the engine. The system for improving the cold start emission performance of the gas engine shortens the light-off time of the catalyst, and reduces the emission of HC and CO in the exhaust gas in the cold start stage of the gas engine. The invention also provides a method for improving the cold start emission performance of the gas engine.
Description
Technical Field
The invention relates to the technical field of tail gas treatment, in particular to a system and a method for improving cold start emission performance of a gas engine.
Background
When the gas engine is in cold start, the supercharger does not work basically, the rotating speed of the gas compressor is low, the air inflow of the engine is low, the combustible mixed gas sprayed into the cylinder is low in excess air coefficient, so that the combustion is insufficient, the emission of HC and CO is high, and the light-off time of the catalyst is long, so that the emission of HC and CO in the exhaust gas of the gas engine in the cold start stage is too high to reach the standard.
Disclosure of Invention
In view of this, the invention provides a system for improving the cold start emission performance of a gas engine, which shortens the light-off time of a catalyst and reduces the emission of HC and CO in the exhaust gas at the cold start stage of the gas engine.
It is another object of the present invention to provide a method of improving cold start emissions performance of a gas engine.
In order to achieve the purpose, the invention provides the following technical scheme:
the system for improving the cold start emission performance of the gas engine comprises an engine, wherein a turbine is arranged on an exhaust pipeline of the engine, a catalyst is arranged at the rear end of the turbine, and an air injection system is arranged on the exhaust pipeline between the turbine and the engine.
Optionally, the exhaust pipeline comprises an exhaust manifold and an exhaust manifold which are arranged in a communicating manner, and the air injection system is arranged on the exhaust manifold.
Optionally, the air injection system comprises an air compressor, and the air compressor is communicated with the exhaust manifold through an air injection pipeline; an electric control valve is arranged on the air injection pipeline; the electric control valve is communicated with the whole vehicle gas cylinder through a pipeline and is in communication connection with an engine ECU.
Optionally, an air flow meter is arranged on the air injection pipeline, and the air flow meter is in communication connection with the engine ECU.
Optionally, a gas composition analyzer is arranged at the position of the exhaust manifold at the front end of the turbine, the gas composition analyzer is in communication connection with the engine ECU, and the gas composition analyzer is used for detecting the content of CO and HC in the exhaust gas.
Optionally, a temperature sensor for detecting the temperature of the exhaust gas is arranged on the exhaust manifold, and the temperature sensor is in communication connection with the engine ECU.
Optionally, the position that the gas injection pipeline with the exhaust manifold is connected is provided with the arc, evenly be provided with a plurality of fumaroles on the arc, the protruding end orientation of arc exhaust manifold.
According to the technical scheme, the air injection system is arranged on the exhaust pipeline and used for injecting air into the exhaust pipeline. Since the engine of the gas engine is in the cold start phase at this time, the content of unburned HC in the exhaust gas in the exhaust line is high. Injecting air into the exhaust pipeline, mixing the air with HC, realizing secondary oxidation of HC before entering a catalyst for post-treatment, and releasing heat in the oxidation process, thus not only reducing the emission of HC and CO before entering the catalyst, but also improving the temperature of exhaust in the exhaust pipeline due to oxidation heat release, shortening the light-off time of the catalyst, improving the light-off performance of the catalyst, and reducing the contents of HC, CO and NOx in the exhaust.
A method for improving cold start emission performance of a gas engine injects air to an exhaust pipeline at the front end of a turbine through an air injection system.
Optionally, the air injection system is in communication connection with an engine ECU, and the engine ECU controls the amount of air injected by the air injection system based on the HC emission amount and the CO emission amount in the exhaust gas at the outlet of the engine to obtain an optimal air-fuel ratio; the engine ECU controls the optimum time for the air injection system to inject air based on the exhaust temperature of the engine.
Alternatively, the exhaust temperature of the engine refers to the exhaust temperature in the exhaust manifold.
The method for improving the cold start emission performance of the gas engine provided by the invention is a method for improving the cold start emission performance of the gas engine by adopting the system, so that the method has the advantages of the system and is not repeated herein.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, 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 drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a system for improving cold-start emission performance of a gas engine according to an embodiment of the present invention.
Detailed Description
The invention discloses a system for improving the cold start emission performance of a gas engine, which shortens the light-off time of a catalytic converter and reduces the emission of HC and CO in exhaust gas in the cold start stage of the gas engine.
It is another object of the present invention to provide a method of improving cold start emissions performance of a gas engine.
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, the present invention provides a system for improving cold start emission performance of a gas engine, including an engine 1, a turbine 4 disposed on an exhaust pipe of the engine 1, a catalyst 5 disposed at a rear end of the turbine 4, and an air injection system disposed on the exhaust pipe between the turbine 4 and the engine 1.
Wherein the turbine 4 is part of a supercharger. The catalyst 5 is a three-way catalyst, is the most important external purifying device installed in the automobile exhaust system, and can convert harmful gases such as CO, HC and NOx discharged by automobile exhaust into harmless carbon dioxide, water and nitrogen through oxidation and reduction, so that the automobile exhaust can be purified. The air injection system is used for injecting air into the exhaust pipeline. The rear end of the turbine 4 is defined in terms of the direction of the air flow, the position to which the air flow reaches behind being the rear end.
According to the system for improving the cold start discharge performance of the gas engine, the air injection system is arranged on the exhaust pipeline and is used for injecting air into the exhaust pipeline. Since the engine 1 of the gas engine is in the cold start phase at this time, the content of unburned HC in the exhaust gas in the exhaust line is high. Injecting air into the exhaust pipeline, mixing the air with HC, realizing secondary oxidation of HC before entering the post-treatment catalyst 5, and releasing heat in the oxidation process, thus not only reducing the emission of HC and CO before entering the catalyst 5, but also improving the temperature of the exhaust in the exhaust pipeline due to oxidation heat release, shortening the light-off time of the catalyst 5, improving the light-off performance of the catalyst 5, and reducing the contents of HC, CO and NOx in the exhaust.
It will be appreciated that the exhaust line comprises an exhaust manifold 3 and an exhaust manifold 2 arranged in communication, the exhaust manifold 2 being arranged to communicate the individual cylinders with the exhaust manifold 3, the exhaust gases from the individual cylinders being directed to the exhaust manifold 3. The air injection system is provided on the exhaust manifold 3, and injects air into the exhaust manifold 3.
The air injection system comprises an air compressor 7, and the air compressor 7 is communicated with the exhaust manifold 3 through an air injection pipeline 8. In order to facilitate the control of the air flow and the flow rate injected into the injection line 8, the injection line 8 is provided with an electrically controlled valve 10. The electric control valve 10 is a three-way electric control valve, one inlet of the electric control valve 10 is communicated with an outlet pipeline of the air compressor 7, the other inlet of the electric control valve 10 is communicated with the whole vehicle air bottle 6 through a pipeline, when the air quantity of the air compressor 7 cannot meet the air demand of the system, the whole vehicle air bottle 6 is communicated with the air injection pipeline 8 through the electric control valve 10, and the air in the whole vehicle air bottle 6 is supplemented into the air injection pipeline 8. To facilitate control of the operating state of the electrically controlled valve 10, the electrically controlled valve 10 is communicatively connected to the engine ECU. The air injection system provided by the invention adopts the air compressor 7 to provide injected air, the air compressor 7 is a component configured on the engine, no additional equipment is needed, air taking is convenient, no additional space is needed, the original structure is not needed to be changed, the cost is saved, and the setting is convenient.
In order to monitor the amount of air injected into the exhaust manifold 3 by the air injection system, an air flow meter 9 is arranged on the injection pipeline 8, and the air flow meter 9 is in communication connection with the engine ECU. The engine ECU obtains the amount of injected air from the measurement value of the air flow meter 9, the pipe inner diameter area of the injection pipe 8, and the ventilation time.
Further, in a specific embodiment, the exhaust manifold 3 is provided with a gas composition analyzer 11 at a position forward of the turbine 4, and the gas composition analyzer 11 is communicatively connected to the engine ECU. The gas composition analyzer 11 is for detecting the contents of CO and HC in the exhaust gas. The gas composition analyzer 11 is communicatively connected to the engine ECU. The gas composition analyzer 11 is disposed away from the turbine 4, that is, near the connection between the exhaust manifold 3 and the exhaust manifold 2, to avoid the influence of the air injected into the exhaust manifold 3 on the detection result. The gas component analyzer 11 is a conventional device, and the structure thereof will not be described in detail here.
In another embodiment, the exhaust manifold 3 is not provided with the gas composition analyzer 11, the gas composition analyzer 11 is only used during calibration before factory shipment, the gas composition analyzer 11 measures the amount of CO and HC discharged at different times of cold start of the engine, the amount of injected air required at different times is obtained according to the content of CO and HC and is calibrated, and the engine ECU controls the amount of air injected into the exhaust manifold 3 by the air injection system according to the calibration result.
Further, a temperature sensor 12 for detecting the temperature of exhaust gas is provided on the exhaust manifold 3, and the temperature sensor 12 is connected in communication with the engine ECU. In order to improve the measurement accuracy of the temperature sensor 12, the temperature sensor 12 is provided near the connection position of the exhaust manifold 3 and the exhaust manifold 2.
In order to improve the homogeneity of jet-propelled air to better mix with the HC in the exhaust of exhaust manifold 3, the position that jet pipe 8 is connected with exhaust manifold 3 is provided with the arc, the arc covers the mouth of pipe position at jet pipe 8, evenly be provided with a plurality of fumaroles on the arc, the protruding end of arc is towards exhaust manifold 3 to the air of the injection that makes is in the gondola water faucet form spouts in exhaust manifold 3. In order to increase the temperature of the injection air in the injection line 8 and to increase the efficiency of the oxidation reaction, a heater is arranged on the injection line 8 for heating the air in the injection line 8.
The invention also provides a method for improving the cold start emission performance of a gas engine, which sprays air to the exhaust pipeline 3 at the front end of the turbine 4 through an air injection system. The air injection system is the injection system described above and will not be described herein. The air injection system is in communication connection with the engine ECU, and the engine ECU calculates the air quantity required by the oxidation reaction based on the HC emission quantity and the CO emission quantity in the exhaust gas at the outlet of the engine during the cold start of the engine. The calculation herein, which is based on the amount of oxygen in the air required for oxidation of HC and CO in the chemical reaction equation, is a common calculation method in the art and is not described herein. The engine ECU controls the amount of air injected by the air injection system based on the above calculation results to obtain an optimum air-fuel ratio.
The exhaust temperature of the engine 1 in this method is the exhaust temperature measured in the exhaust manifold 3.
The method for improving the cold start emission performance of the gas engine aims at the emission characteristic of high unburned HC in the exhaust gas in the cold start stage of the gas engine 1, utilizes the principle that the oxidation heat release of HC and CO before entering the post-treatment catalyst 5 is realized by injecting air into an exhaust pipe, not only reduces the emission of HC and CO before entering the catalyst 5, but also shortens the ignition time of the catalyst 5 and reduces the emission of HC, CO and NOx in the cold start stage of the gas engine through the improvement of the exhaust temperature.
In the description of the present solution, it is to be understood that the terms "upper", "lower", "vertical", "inside", "outside", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present solution.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The system for improving the cold start emission performance of the gas engine comprises an engine, wherein a turbine is arranged on an exhaust pipeline of the engine, and a catalyst is arranged at the rear end of the turbine.
2. The system for improving cold-start emission performance of a gas engine as claimed in claim 1, wherein said exhaust line comprises an exhaust manifold and an exhaust manifold disposed in communication, said air injection system being disposed on said exhaust manifold.
3. The system for improving cold start emission performance of a gas engine of claim 2, wherein said air injection system comprises an air compressor in communication with said exhaust manifold via an injection line; an electric control valve is arranged on the air injection pipeline; the electric control valve is communicated with the whole vehicle gas cylinder through a pipeline and is in communication connection with an engine ECU.
4. A system for improving gas engine cold start emissions performance according to claim 3, wherein an air flow meter is provided on the jet line, the air flow meter being in communication with the engine ECU.
5. The system for improving cold start emission performance of a gas engine as claimed in claim 2, wherein a gas composition analyzer is provided at a position of the exhaust manifold at the front end of the turbine, the gas composition analyzer being in communication with an engine ECU for detecting contents of CO and HC in the exhaust gas.
6. The system for improving cold start emission performance of a gas engine as claimed in claim 2, wherein a temperature sensor for detecting exhaust gas temperature is provided on the exhaust manifold, and the temperature sensor is in communication with an engine ECU.
7. The system for improving the cold-start emission performance of a gas engine as claimed in claim 3, wherein a curved plate is arranged at the position where the gas injection pipeline is connected with the exhaust manifold, a plurality of gas injection holes are uniformly formed in the curved plate, and the convex end of the curved plate faces the exhaust manifold.
8. A method for improving cold start emission performance of a gas engine is characterized in that air is injected to an exhaust pipeline at the front end of a turbine through an air injection system.
9. A method for improving cold-start emission performance of a gas engine according to claim 8, wherein the air injection system is connected in communication with an engine ECU, and the engine ECU controls the amount of air injected by the air injection system based on the amount of HC and CO discharged from the exhaust gas of the engine outlet to obtain an optimum air-fuel ratio at the time of cold start of the engine, and controls the optimum time for the air injection system to inject air based on the exhaust temperature of the engine.
10. The method of improving cold start emission performance of a gas engine as claimed in claim 9, wherein the exhaust temperature of the engine is the exhaust temperature in the exhaust manifold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011209828.XA CN112302768A (en) | 2020-11-03 | 2020-11-03 | System and method for improving cold start discharge performance of gas engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011209828.XA CN112302768A (en) | 2020-11-03 | 2020-11-03 | System and method for improving cold start discharge performance of gas engine |
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| CN112302768A true CN112302768A (en) | 2021-02-02 |
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| CN202011209828.XA Pending CN112302768A (en) | 2020-11-03 | 2020-11-03 | System and method for improving cold start discharge performance of gas engine |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4338696A1 (en) * | 1993-11-12 | 1995-05-18 | Audi Ag | System for decontaminating exhaust gas of IC engine |
| US20080006031A1 (en) * | 2006-06-12 | 2008-01-10 | Mann & Hummel Gmbh | Internal combustion engine with secondary air injection system |
| CN104053871A (en) * | 2011-12-23 | 2014-09-17 | 沃尔沃拉斯特瓦格纳公司 | Exhaust aftertreatment system and method for operating the system |
| CN105822463A (en) * | 2016-05-06 | 2016-08-03 | 哈尔滨工程大学 | Venturi pipe waste gas recirculating device of improved ship low-speed diesel engine |
| CN209129720U (en) * | 2018-10-31 | 2019-07-19 | 上海汽车集团股份有限公司 | The pressure-air injection apparatus of engine exhaust system |
| CN110714815A (en) * | 2018-07-12 | 2020-01-21 | 通用汽车环球科技运作有限责任公司 | Thermoelectric module for use in a vehicle system |
| CN111237102A (en) * | 2020-02-19 | 2020-06-05 | 中国第一汽车股份有限公司 | Engine system and control method |
-
2020
- 2020-11-03 CN CN202011209828.XA patent/CN112302768A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4338696A1 (en) * | 1993-11-12 | 1995-05-18 | Audi Ag | System for decontaminating exhaust gas of IC engine |
| US20080006031A1 (en) * | 2006-06-12 | 2008-01-10 | Mann & Hummel Gmbh | Internal combustion engine with secondary air injection system |
| CN104053871A (en) * | 2011-12-23 | 2014-09-17 | 沃尔沃拉斯特瓦格纳公司 | Exhaust aftertreatment system and method for operating the system |
| CN105822463A (en) * | 2016-05-06 | 2016-08-03 | 哈尔滨工程大学 | Venturi pipe waste gas recirculating device of improved ship low-speed diesel engine |
| CN110714815A (en) * | 2018-07-12 | 2020-01-21 | 通用汽车环球科技运作有限责任公司 | Thermoelectric module for use in a vehicle system |
| CN209129720U (en) * | 2018-10-31 | 2019-07-19 | 上海汽车集团股份有限公司 | The pressure-air injection apparatus of engine exhaust system |
| CN111237102A (en) * | 2020-02-19 | 2020-06-05 | 中国第一汽车股份有限公司 | Engine system and control method |
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