CN111997719A - Three way catalyst converter thermal management system - Google Patents
Three way catalyst converter thermal management system Download PDFInfo
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- CN111997719A CN111997719A CN202010927559.4A CN202010927559A CN111997719A CN 111997719 A CN111997719 A CN 111997719A CN 202010927559 A CN202010927559 A CN 202010927559A CN 111997719 A CN111997719 A CN 111997719A
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- way catalyst
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- thermal management
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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
- F01N3/20—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 specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
- F01N3/2033—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using a fuel burner or introducing fuel into exhaust duct
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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
- F02B37/12—Control of the pumps
- F02B37/18—Control of the pumps by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
- F02B37/183—Arrangements of bypass valves or actuators therefor
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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
- F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
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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)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses a three-way catalyst thermal management system, which is applied to a natural gas engine and comprises an exhaust tail pipe for discharging waste gas generated by combustion of the natural gas engine, wherein the exhaust tail pipe is provided with a turbine and a three-way catalyst, the exhaust tail pipe is provided with a burner for heating the waste gas in the exhaust tail pipe, and the burner is positioned at the upstream of the three-way catalyst; the gas intake of the burner is connected with the gas intake manifold of the natural gas engine through a gas intake pipe, and the gas intake pipe is provided with a gas storage tank, a first one-way valve located at the upstream of the gas storage tank, an electromagnetic valve located at the downstream of the gas storage tank and a second one-way valve. According to the heat management system, ignition and combustion are performed through the igniter in the combustor, so that the temperature of the waste gas at the upstream of the three-way catalyst is increased, and the problem of low-temperature emission of the three-way catalyst is further avoided; through the high-temperature and constant-temperature control of the exhaust temperature and the increase of the exhaust gas flow, the aging simulation of the three-way catalyst can be accelerated, and the occupation of resources is reduced.
Description
Technical Field
The invention relates to the technical field of thermal management, in particular to a thermal management system of a three-way catalyst.
Background
With the implementation of the national six-emission regulation, clear requirements are made on emission limit values and the durability of emission control devices, and how to control emissions and how to make an effective emission control device durability test become an important issue for enterprises. For a national six-equivalent natural gas engine, the three-way catalyst is the only emission control device, the catalytic efficiency of the three-way catalyst directly determines the emission level of the engine, and the endurance check of the three-way catalyst is the most effective measure for ensuring the emission endurance. Currently, to reduce the amount of precious metal used by a three-way catalyst to cut costs, great adjustments are made in transient control strategies, but the minimum precious metal usage is still limited by low temperature emissions and emission durability requirements. Therefore, the method solves the problem of low-temperature emission and implements accurate and effective endurance test, and is the primary task of further reducing the consumption of the noble metal of the three-way catalyst.
For a non-aged three-way catalyst, low temperature emissions are directly dependent on the substrate temperature, with higher substrate temperatures being more efficient and lower emissions. The use of electrically heated grids or controlled backpressure methods can increase the carrier temperature, but with limited effectiveness and poor accuracy. If the durability of the three-way catalyst is evaluated by time accumulation, the resource occupation is excessive, so that the rapid aging is very important. At present, the rapid aging method comprises high-temperature furnace aging, continuous high-temperature hot gas washing, bench special circulation and the like, the former two methods can simulate high-temperature aging, but the influence of air-fuel ratio alternating impact, catalyst poisoning, reaction product blocking micropore channels, mechanical vibration and the like on aging cannot be evaluated, and the bench special circulation damages an engine, cannot effectively control temperature and cannot effectively carry out durability evaluation.
In conclusion, how to solve the problems that the three-way catalyst occupies more resources in low-temperature emission and endurance check and simulation is inaccurate becomes a technical problem to be solved urgently by the technical personnel in the field.
Disclosure of Invention
The invention aims to provide a three-way catalyst thermal management system to solve the problems of high resource occupation and inaccurate simulation of low-temperature emission and endurance check of a three-way catalyst.
In order to achieve the above object, the present invention provides a three-way catalyst thermal management system applied to a natural gas engine, comprising a tail pipe for discharging exhaust gas generated by combustion of the natural gas engine, wherein the tail pipe is provided with a turbine of a supercharger and a three-way catalyst, the tail pipe is provided with a burner for heating the exhaust gas in the tail pipe, and the burner is located upstream of the three-way catalyst; the gas intake port of the burner is connected with an air intake main pipe of the natural gas engine through a gas intake pipe, and the gas intake pipe is provided with a gas storage tank, a first one-way valve located at the upstream of the gas storage tank, an electromagnetic valve located at the downstream of the gas storage tank and a second one-way valve located at the downstream of the electromagnetic valve.
Preferably, the three-way catalytic converter further comprises a micro control unit and a carrier temperature sensor arranged on the three-way catalytic converter;
when the temperature value detected by the carrier temperature sensor is lower than a preset temperature range, the micro control unit controls the electromagnetic valve to be opened and controls an igniter of the combustor to start ignition.
Preferably, the fire detection device further comprises a fire sensor in signal connection with the micro control unit, wherein the fire sensor is arranged on the combustor and used for detecting whether the combustor fires or not.
Preferably, the burner is arranged offset from the fluid passage of the tail pipe.
Preferably, the burners are microtubes arranged in an array.
Preferably, the supercharger is a turbocharger equipped with an exhaust gas regulating valve mounted on the turbine and adapted to regulate the opening of a bypass passage in the turbine for short-circuiting an exhaust gas flow passage of the turbine.
Preferably, the micro control unit is connected with the electric control unit, and the micro control unit and the electric control unit can realize the interchange of state information.
Preferably, the gas taking pipe is further provided with a short-circuit pipeline for short-connecting the first one-way valve and the gas storage tank.
Compared with the introduction content of the background technology, the three-way catalyst thermal management system is applied to a natural gas engine and comprises an exhaust tail pipe for discharging exhaust gas generated by combustion of the natural gas engine, wherein the exhaust tail pipe is provided with a turbine of a supercharger and a three-way catalyst, the exhaust tail pipe is provided with a burner for heating the exhaust gas in the exhaust tail pipe, and the burner is positioned at the upstream of the three-way catalyst; the gas intake of the burner is connected with the intake manifold of the natural gas engine through a gas intake pipe, and the gas intake pipe is provided with a gas storage tank, a first one-way valve located at the upstream of the gas storage tank, an electromagnetic valve located at the downstream of the gas storage tank and a second one-way valve located at the downstream of the electromagnetic valve. This three way catalyst converter thermal management system in practical application process, can solve the problem that three way catalyst converter low temperature discharged on the one hand, and specific process is: when the temperature of a carrier in the three-way catalyst is lower than a preset temperature range, the electromagnetic valve is opened, combustible mixture enters the combustor through the first one-way valve of the air taking pipe and the air storage tank, ignition and combustion are carried out through an igniter in the combustor, the temperature of waste gas at the upstream of the three-way catalyst is increased, and then the problem of low-temperature emission of the three-way catalyst is avoided; it should be noted that, because the natural gas engine operates at low load and the pressure of the mixed gas in the intake manifold is low, an effective pressure difference cannot be formed at this time, and therefore, no combustible mixed gas enters the combustor to be combusted; however, due to the existence of the gas storage tank, when the natural gas engine runs at medium and high loads, part of combustible mixed gas can be stored in the gas storage tank so as to be used when the temperature of a carrier of the three-way catalyst is lower under the low-load working condition; on the other hand, when the three-way catalyst needs to be subjected to endurance check, the electromagnetic valve is directly opened to enable the combustor to continuously work, the exhaust gas flow of the three-way catalyst is increased, and meanwhile, the exhaust temperature is increased, so that the three-way catalyst can be rapidly aged.
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 three-way catalyst thermal management system according to an embodiment of the present invention.
In the above-mentioned figure 1, the first,
the system comprises an air inlet pipe 1, an air compressor 2, an air inlet intercooler 3, a gas channel 4, an air inlet manifold 5, a natural gas engine 6, an air taking pipe 7, an EGR valve 8, an EGR intercooler 9, a three-way catalyst 10, a misfire sensor 11, a second one-way valve 12, a combustor 13, a turbine 14, an exhaust manifold 15, a first one-way valve 16, a carrier temperature sensor 17, an igniter 18, an air storage tank 19, an electric control unit 20, a micro control unit 21 and an electromagnetic valve 22.
Detailed Description
The invention provides a three-way catalyst heat management system, which aims to solve the problems of high resource occupation and inaccurate simulation of low-temperature emission and endurance check of a three-way catalyst.
In order to make those skilled in the art better understand the technical solutions provided by the present invention, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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.
As shown in fig. 1, a three-way catalyst thermal management system provided by an embodiment of the present invention is applied to a natural gas engine, and includes a tail pipe for discharging exhaust gas generated by combustion of the natural gas engine, a turbine 14 of a supercharger and a three-way catalyst 10 are disposed on the tail pipe, a burner 13 for heating the exhaust gas in the tail pipe is disposed on the tail pipe, and the burner 13 is located upstream of the three-way catalyst 10; an air intake port of the burner 10 is connected with an air intake manifold 5 of the natural gas engine through an air intake pipe 7, and the air intake pipe 7 is provided with an air storage tank 19, a first check valve 16 positioned at the upstream of the air storage tank 19, an electromagnetic valve 22 positioned at the downstream of the air storage tank 19 and a second check valve 12 positioned at the downstream of the electromagnetic valve 22.
This three way catalyst converter thermal management system in practical application process, can solve the problem that three way catalyst converter low temperature discharged on the one hand, and specific process is: when the temperature of a carrier in the three-way catalyst is lower than a preset temperature range, the electromagnetic valve is opened, combustible mixture enters the combustor through the first one-way valve of the air taking pipe and the air storage tank, ignition and combustion are carried out through an igniter in the combustor, the temperature of waste gas at the upstream of the three-way catalyst is increased, and then the problem of low-temperature emission of the three-way catalyst is avoided; it should be noted that, because the natural gas engine operates at low load and the pressure of the mixed gas in the intake manifold is low, an effective pressure difference cannot be formed at this time, and therefore, no combustible mixed gas enters the combustor to be combusted; however, due to the existence of the gas storage tank, when the natural gas engine runs at medium and high loads, part of combustible mixed gas can be stored in the gas storage tank so as to be used when the temperature of a carrier of the three-way catalyst is lower under the low-load working condition; on the other hand, when the three-way catalyst needs to be subjected to endurance check, the electromagnetic valve is directly opened to enable the combustor to continuously work, the exhaust gas flow of the three-way catalyst is increased, and meanwhile, the exhaust temperature is increased, so that the three-way catalyst can be rapidly aged.
The second check valve 12 mainly functions as a safety valve, and the second check valve 12 is provided in the intake pipe 7, and the second check valve 12 is located downstream of the electromagnetic valve 22, so that the electromagnetic valve 22 can be effectively prevented from being damaged by reverse blow-by of high-temperature exhaust gas, thereby inducing danger.
In some specific embodiments, the three-way catalyst thermal management system may further include a micro-control unit 21 and a substrate temperature sensor 17 disposed on the three-way catalyst 10; when the temperature value detected by the carrier temperature sensor 17 is lower than the preset temperature range, the micro control unit 21 controls the electromagnetic valve 22 to be opened, and controls the igniter 18 of the burner 13 to start ignition. The electromagnetic valve 22, the igniter 18 and the carrier temperature sensor 17 are controlled and monitored by the micro control unit 21 to form a micro control network, and the control is more flexible by adopting a distributed micro control network. The specific process is as follows: when the carrier temperature sensor 17 detects that the carrier temperature of the three-way catalyst is lower than a preset temperature range, the micro control unit 21 sends a signal to open the electromagnetic valve 22, the igniter 18 is started to ignite, and then the three-way catalyst (TWC) can be combusted and heated in the combustor 13 to exhaust gas, so that the carrier temperature of the TWC is increased. It is understood that the manner in which the micro-control units form the micro-control network is merely a preferred example of the control of the three-way catalyst thermal management system according to the embodiment of the present invention, and in practical applications, the control may be performed directly by the electronic control unit ECU, and the operation load of the electronic control unit 20 may be increased only by directly performing the control by the ECU.
In a further embodiment, the three-way catalyst thermal management system further comprises a misfire sensor 11 in signal connection with the micro control unit 21, and the misfire sensor 11 is arranged on the combustor 13 for detecting whether the combustor 13 is in a misfire state. By means of the misfire sensor 11 it is possible to monitor whether a misfire condition is present in the burner 13 and in turn it is possible to facilitate the control by the micro control unit 21 whether the igniter 18 of the burner 13 performs an ignition operation: for example, after the primary ignition is completed, but the burner is in the fire condition due to some reasons, whether the fire condition occurs in the burner can be monitored by designing the fire sensor, and then when the temperature of the carrier in the three-way catalyst is lower than the preset temperature range and the monitoring result of the fire sensor 11 is the fire condition, the micro control unit 21 controls the igniter 18 to perform the ignition operation; if the monitoring result of the misfire sensor 11 is a fired state, it is not necessary to control the igniter 18 to perform an ignition operation.
In some specific embodiments, the burner 13 is preferably designed to be disposed away from the fluid passage of the tail pipe, which in turn prevents the exhaust gas in the tail pipe from blowing out the flame of the burner.
In some more specific embodiments, the above-described burners 13 may be designed as a microtube structure arranged in an array. By adopting the design of the array microtubes, the combustor 13 can burn more uniformly and fully, and can also play a role in preventing the backflow of flame. It is understood that the above-mentioned burner adopts the micro-tube structure arranged in an array, which is merely a preferred example of the embodiment of the present invention, and in the practical application, other burner structures may be selected according to practical requirements, which is not limited herein in more detail.
In a further embodiment, the supercharger is a turbocharger equipped with a wastegate valve mounted on the turbine 14 and used to adjust the opening of a bypass passage in the turbine 14 for short-circuiting the exhaust gas flow path of the turbine 14. The bypass passage is a passage formed inside the turbine. It should be noted that, under normal operating conditions of the turbocharger equipped with the exhaust gas regulating valve, the exhaust gas regulating valve performs closed-loop control on the pressure of the intake manifold 5; when the waste gas flow of the turbine needs to be increased, more waste gas can flow through the turbine by adjusting the opening degree of the waste gas adjusting valve, so that the waste gas flow of the turbine is increased, the air inlet pressure of the air compressor is increased, and the air inlet amount is increased. For example, when the gas taking pipe 7 takes gas from the gas inlet main pipe, the exhaust gas flow of the turbine is increased by adjusting the opening degree of the exhaust gas regulating valve arranged on the turbocharger, and then the air inflow of the compressor is increased, so that the problem of reduction of the air inflow caused by gas taking of the gas taking pipe can be compensated, and the problem of reduction of the dynamic property is avoided.
It should be noted that, as known to those skilled in the art, a natural gas engine includes an air intake system and an exhaust system, wherein the air intake process of the air intake system is as follows: fresh air enters an air compressor 2 through an air inlet pipe 1, the compressed air is cooled in an air inlet intercooler 3, the cooled air is mixed with gas and EGR gas in a gas channel 4, the EGR gas enters the air inlet pipe through an EGR intercooler 9 and an EGR valve 8, and the mixed combustible mixed gas enters an air inlet manifold 5 and is distributed to each cylinder of a natural gas engine 6 for combustion; the exhaust process of the exhaust system is as follows: the combustion waste gas of each cylinder is collected in an exhaust manifold 15 and then discharged, most of the discharged gas waste gas enters a turbine 14 with a waste gas bypass valve to push the turbine to rotate and drive a coaxial compressor 2 to compress air to do work, a small part of the combustion waste gas enters an air inlet system in an EGR mode through an EGR intercooler 9 and an EGR valve 8, and the combustion waste gas discharged from the turbine 14 is purified by a three-way catalyst 10 and then discharged into the atmosphere.
It should be noted that, as those skilled in the art will understand, the aforementioned first check valve and the second check valve are conducted in the flowing direction from the intake port of the intake pipe to the intake port of the burner.
In some specific embodiments, the micro control unit 21 is connected to the electronic control unit 20, and the micro control unit 21 and the electronic control unit 20 can exchange status information. The arrangement enables the micro control unit 21 and the Electric Control Unit (ECU)20 to transmit a small amount of state information to each other, which not only satisfies the requirement of more flexible control of the distributed micro control network, but also obtains the comprehensive response of the ECU.
In some more specific embodiments, the gas extraction pipe 7 may further be provided with a short-circuit line for short-circuiting the first check valve 16 and the gas storage tank 19. This short circuit pipeline's one end is connected in the upper reaches of first check valve, the other end of short circuit pipeline is connected in the low reaches of gas holder, certainly, technical personnel in the field should all understand, the short circuit pipeline all should be equipped with the short circuit valve, when needs are to three way catalyst converter execution quick ageing simulation, can directly switch on the short circuit pipeline through opening the short circuit valve, and make the engine continuously be in well high load operating mode, can make equivalent combustible gas get into in the combustor fast like this, thereby be favorable to accelerating three way catalyst converter's ageing simulation more, it is long when ageing has been practiced thrift greatly, the occupation of the resource of saving.
The three-way catalyst thermal management system provided by the invention is described in detail above. It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
It is also noted that, in this document, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in an article or device that comprises the element.
The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the core concepts of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (8)
1. A three-way catalyst thermal management system applied to a natural gas engine, comprising a tail pipe for discharging exhaust gas generated by combustion of the natural gas engine, wherein a turbine (14) of a supercharger and a three-way catalyst (10) are arranged on the tail pipe, and the tail pipe is provided with a burner (13) for heating the exhaust gas in the tail pipe, and the burner (13) is positioned at the upstream of the three-way catalyst (10); an air intake port of the combustor (10) is connected with an air intake main pipe (5) of the natural gas engine through an air intake pipe (7), and the air intake pipe (7) is provided with an air storage tank (19), a first one-way valve (16) located at the upstream of the air storage tank (19), an electromagnetic valve (22) located at the downstream of the air storage tank (19) and a second one-way valve (12) located at the downstream of the electromagnetic valve (22).
2. The three-way catalyst thermal management system of claim 1, further comprising a micro-control unit (21) and a substrate temperature sensor (17) disposed on the three-way catalyst (10);
when the temperature value detected by the carrier temperature sensor (17) is lower than a preset temperature range, the micro control unit (21) controls the electromagnetic valve (22) to be opened and controls an igniter (18) of the combustor (13) to start ignition.
3. The three-way catalyst thermal management system according to claim 2, further comprising a misfire sensor (11) in signal connection with the micro control unit (21), the misfire sensor (11) being arranged on the burner (13) for detecting whether the burner (13) is misfiring.
4. The three-way catalyst thermal management system of claim 1, wherein the burner (13) is disposed offset from a fluid passage of the tail pipe.
5. The three-way catalyst thermal management system of claim 1, wherein the burner (13) is a microtube structure arranged in an array.
6. The three-way catalyst thermal management system according to claim 1, wherein the supercharger is a turbocharger equipped with a wastegate valve mounted on the turbine (14) and adapted to regulate the degree of opening of a bypass passage in the turbine (14) for short-circuiting the exhaust gas flow path of the turbine (14).
7. The three-way catalyst thermal management system according to claim 1, characterized in that the micro control unit (21) establishes a connection with the electric control unit (20) and the micro control unit (21) and the electric control unit (20) are capable of exchanging status information.
8. The three-way catalyst thermal management system according to any one of claims 1 to 7, characterized in that a short circuit line for short-circuiting the first check valve (16) and the air reservoir (19) is further provided on the intake pipe (7).
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| CN112664303A (en) * | 2020-12-25 | 2021-04-16 | 潍柴动力股份有限公司 | Engine aftertreatment protection method, device, equipment and storage medium |
| CN115045758A (en) * | 2022-06-17 | 2022-09-13 | 广西玉柴机器股份有限公司 | Monitoring system and monitoring method |
| DE102021107433A1 (en) | 2021-03-24 | 2022-09-29 | Volkswagen Aktiengesellschaft | Internal combustion engine and method for operating an internal combustion engine |
| US11891935B1 (en) * | 2023-05-24 | 2024-02-06 | Honda Motor Co., Ltd | Exhaust gas purification apparatus |
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| US11891935B1 (en) * | 2023-05-24 | 2024-02-06 | Honda Motor Co., Ltd | Exhaust gas purification apparatus |
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