CN116085152A - Exhaust gas recirculation system of range-extended two-cylinder engine - Google Patents

Exhaust gas recirculation system of range-extended two-cylinder engine Download PDF

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Publication number
CN116085152A
CN116085152A CN202211387477.0A CN202211387477A CN116085152A CN 116085152 A CN116085152 A CN 116085152A CN 202211387477 A CN202211387477 A CN 202211387477A CN 116085152 A CN116085152 A CN 116085152A
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China
Prior art keywords
exhaust gas
gas recirculation
cylinder
pipeline valve
interface
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CN202211387477.0A
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Chinese (zh)
Inventor
张宇璠
王占峰
肖宏宇
李春雨
马赫阳
黄平慧
李华
宫艳峰
韩令海
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FAW Group Corp
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FAW Group Corp
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Priority to CN202211387477.0A priority Critical patent/CN116085152A/en
Publication of CN116085152A publication Critical patent/CN116085152A/en
Pending legal-status Critical Current

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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
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
    • F01M11/10—Indicating devices; Other safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M5/00—Heating, cooling, or controlling temperature of lubricant; Lubrication means facilitating engine starting
    • F01M5/001—Heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D21/00—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas
    • F02D21/06—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air
    • F02D21/08—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G5/00—Profiting from waste heat of combustion engines, not otherwise provided for
    • F02G5/02—Profiting from waste heat of exhaust gases
    • 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
    • F02M26/45—Sensors specially adapted for EGR systems
    • F02M26/46—Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition
    • 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
    • F02M35/02—Air cleaners
    • F02M35/024—Air cleaners using filters, e.g. moistened
    • 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)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Analytical Chemistry (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Abstract

The embodiment of the invention discloses an extended-range two-cylinder engine exhaust gas recirculation system, which comprises: an air cleaner, an air intake system, a first cylinder, a second cylinder, and an exhaust gas recirculation system; the outlet of the air filter is connected with a first interface of the air inlet system; the second interface of the air inlet system is connected with the inlet of the first cylinder, the outlet of the first cylinder is connected with the inlet of the exhaust gas recirculation system, and the first outlet of the exhaust gas recirculation system is connected with the second interface of the air inlet system; the third port of the air inlet system is connected with the inlet of the second cylinder, and the outlet of the second cylinder is connected with the tail pipe. The embodiment of the invention ensures that the exhaust pressure of a single cylinder is larger, and realizes larger EGR rate.

Description

Exhaust gas recirculation system of range-extended two-cylinder engine
Technical Field
The embodiment of the invention relates to the technical field of exhaust gas recirculation, in particular to an exhaust gas recirculation system of a range-extended two-cylinder engine.
Background
The degree of motorization is continuously deepened, the proportion of the hybrid power is gradually increased, and the engine is gradually changed from a high-power and low-efficiency power provider to a low-power and high-efficiency energy converter.
Because the hybrid power needs to be additionally provided with a three-electric system, the cost is continuously increased, and the cost of a special engine for hybrid power needs to be reduced so as to further promote the development of the hybrid power.
The current mainstream exhaust gas recirculation system (Exhaust Gas Recirculation, EGR) is designed aiming at the traditional four-cylinder engine, the highest EGR rate which can be realized is less than or equal to 25 percent, and the EGR entering each cylinder is uneven to a certain extent due to the interference of the air intake and the exhaust among the four cylinders.
Disclosure of Invention
The embodiment of the invention provides an extended-range two-cylinder engine exhaust gas recirculation system, which enables the exhaust pressure of a single cylinder to be larger and realizes a larger EGR rate.
According to an aspect of the present invention, there is provided an extended range two-cylinder engine exhaust gas recirculation system comprising:
an air cleaner, an air intake system, a first cylinder, a second cylinder, and an exhaust gas recirculation system;
an outlet of the air filter is connected with a first interface of the air inlet system;
the second interface of the air inlet system is connected with the inlet of the first cylinder, the outlet of the first cylinder is connected with the inlet of the exhaust gas recirculation system, and the first outlet of the exhaust gas recirculation system is connected with the second interface of the air inlet system;
the third port of the air inlet system is connected with the inlet of the second cylinder, and the outlet of the second cylinder is connected with the tail pipe.
Further, the exhaust gas recirculation system comprises an exhaust gas recirculation pipeline valve, an exhaust gas recirculation steady pressure cavity, a first air inlet pipeline valve and a first flow sensor;
the outlet of the first cylinder is connected with a first interface of an exhaust gas recirculation pipeline valve;
the second interface of the exhaust gas recirculation pipeline valve is connected with the inlet of the exhaust gas recirculation pressure stabilizing cavity;
the first outlet of the exhaust gas recirculation pressure stabilizing cavity is connected with a first interface of a first air inlet pipeline valve, a second interface of the first air inlet pipeline valve is connected, a first flow sensor is arranged at the second interface of the first air inlet pipeline valve and used for detecting the flow of the second interface of the first air inlet pipeline valve, and a first outlet of the exhaust gas recirculation system is connected with the second interface of the air inlet system;
the flow rate at the second interface of the first intake conduit valve matches the opening of the first intake conduit valve.
Further, the exhaust gas recirculation system further includes a second intake conduit valve and a second flow sensor;
the second outlet of the exhaust gas recirculation pressure stabilizing cavity is connected with the first interface of the second air inlet pipeline valve, the second interface of the second air inlet pipeline valve is connected, the second flow sensor is arranged at the second interface of the second air inlet pipeline valve and used for detecting the flow of the second interface of the second air inlet pipeline valve, and the second outlet of the exhaust gas recirculation system is connected with the third interface of the air inlet system;
the flow rate at the second interface of the second intake conduit valve matches the opening of the second intake conduit valve.
Further, the device also comprises a heat exchange pipeline, wherein the heat exchange pipeline comprises an oil pan of the oil tank and a heat exchanger;
an inlet of the heat exchanger is connected with a first outlet of the second cylinder, and the heat exchanger is arranged at an oil pan of the oil tank;
the outlet of the heat exchanger is connected with a tail pipe.
Further, the engine oil heating pipeline valve and the engine oil temperature measuring sensor are also included;
the first interface of the engine oil heating pipeline valve is connected with the first outlet of the second cylinder, and the second interface of the engine oil heating pipeline valve is connected with the inlet of the heat exchanger;
the engine oil temperature measuring sensor is used for detecting the engine oil temperature in the oil pan of the oil tank;
the temperature of the engine oil in the oil pan of the oil tank is matched with the opening degree of the engine oil heating pipeline valve.
Further, the temperature of the engine oil in the oil pan of the oil tank is less than or equal to a first preset temperature, and the engine oil heating pipeline valve is opened.
Further, the device also comprises an energy recovery pipeline;
the energy recovery pipeline comprises an air storage tank, a thermoelectric generator and an energy storage device;
the inlet of the air storage tank is connected with the second outlet of the second cylinder;
the air inlet of the thermoelectric generator is connected with the outlet of the air storage tank, and the electric energy output end of the thermoelectric generator is connected with the input end of the energy storage device.
Further, the energy storage device comprises a battery.
Further, the energy recovery pipeline also comprises an energy recovery pipeline valve;
the first port of the energy recovery pipeline valve is connected with the second outlet of the second cylinder, and the second port of the energy recovery pipeline valve is connected with the inlet of the air storage tank;
the temperature of the engine oil in the oil pan of the oil tank is matched with the opening degree of the energy recovery pipeline valve.
Further, the temperature of the engine oil in the oil pan of the oil tank is smaller than or equal to a second preset temperature, the engine oil heating pipeline valve is opened, and the energy recovery pipeline valve is closed.
The temperature of the engine oil in the oil pan of the oil tank is larger than a second preset temperature, the energy recovery pipeline valve is opened, and the engine oil heating pipeline valve is closed.
According to the exhaust gas recirculation system of the range-extended two-cylinder engine, provided by the embodiment of the invention, impurity dust in air can be filtered through the design of the air filter and the air inlet system, and meanwhile, mixed gas with proper concentration is provided. The outlet of the first cylinder is connected with the inlet of the exhaust gas recirculation system through an exhaust manifold, so that the exhaust pressure of a single cylinder is higher, and a higher EGR rate is realized.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an extended range two-cylinder engine exhaust gas recirculation system according to a first embodiment of the present disclosure;
fig. 2 is a flow chart of a method of an extended range two-cylinder engine exhaust gas recirculation system according to a second embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
An embodiment of the invention provides an exhaust gas recirculation system of a range-extended two-cylinder engine, and fig. 1 is a schematic diagram of the exhaust gas recirculation system of the range-extended two-cylinder engine according to the embodiment of the invention. Referring to fig. 1, an extended range two-cylinder engine exhaust gas recirculation system includes:
an air cleaner 1, an intake system 2, a first cylinder 6, a second cylinder 5, and an exhaust gas recirculation system a;
the outlet of the air filter 1 is connected with a first interface of the air inlet system 2;
the second port 4 of the air intake system 2 is connected with the inlet of the first cylinder 6, the outlet of the first cylinder 6 is connected with the inlet of the exhaust gas recirculation system A, and the first outlet (1) of the exhaust gas recirculation system is connected with the second port 4 of the air intake system 2;
the third port 3 of the intake system 2 is connected to the inlet of the second cylinder 5, and the outlet of the second cylinder 5 is connected to the tailpipe 18.
The air filter 1 mainly filters out impurity dust in the air, and provides clean and fresh air to enter the cylinder air inlet system 2. The function of the inlet system 2 is mainly to provide the first cylinder 6 and the second cylinder 5 with a mixture of a suitable concentration. The tail pipe 18 mainly functions to discharge the exhaust gas generated by the second cylinder 5 to the atmosphere through the tail pipe 18. Specifically, compared with the conventional four-cylinder exhaust pipeline which enters the exhaust gas recirculation system A through one manifold, the inlet pressure of the exhaust gas recirculation system A is reduced because the pipeline is thickened after the four-cylinder exhaust pipeline is gathered through one manifold, and the outlet of the first cylinder 6 is connected with the inlet of the exhaust gas recirculation system A through one exhaust manifold 8, so that the inlet pressure of the exhaust gas recirculation system A is increased, and the EGR rate of the exhaust gas recirculation system A of the extended-range two-cylinder engine is positively influenced.
According to the extended-range two-cylinder engine exhaust gas recirculation system provided by the embodiment of the invention, impurity dust in air can be filtered through the design of the air filter 1 and the air inlet system 2, and meanwhile, mixed gas with proper concentration is provided. The outlet of the first cylinder 6 is connected with the inlet of the exhaust gas recirculation system A through an exhaust manifold 8, so that the exhaust pressure of a single cylinder is higher, and a higher EGR rate is realized.
Optionally, the exhaust gas recirculation system a includes an exhaust gas recirculation line valve 20, an exhaust gas recirculation plenum 21, a first intake line valve 26, and a first flow sensor 27;
the outlet of the first cylinder 6 is connected to a first port of an exhaust gas recirculation line valve 20;
a second port of the exhaust gas recirculation line valve 20 is connected with an inlet of the exhaust gas recirculation plenum 21;
the first outlet 25 of the exhaust gas recirculation manostat 21 is connected with a first interface of a first air inlet pipeline valve 26, a second interface of the first air inlet pipeline valve 26 is connected, a first flow sensor 27 is arranged at the second interface of the first air inlet pipeline valve 26 and used for detecting the flow rate at the second interface of the first air inlet pipeline valve 26, and the first outlet (1) of the exhaust gas recirculation system A is connected with the second interface 4 of the air inlet system 2;
the flow rate at the second port of the first intake conduit valve 26 matches the opening of the first intake conduit valve 26.
The main function of the egr line valve 20 is, among other things, to control the operation of the egr system a. The function of the egr plenum 21 is to stabilize the pressure of the air flow so that the air exiting the first cylinder 6 through an exhaust manifold 8 can form a more stable flow field and pressure field in the egr plenum 21, allowing more and more even air to enter the first and second cylinders 6, 5. The first flow sensor 27 is mainly responsible for monitoring the air flow condition of the first air intake pipe, and may be, for example, a vane type air flow sensor, a vortex street flow sensor, etc., which is not limited in this embodiment of the present invention. The first air inlet pipe valve 26 is mainly responsible for controlling the air flow rate of the first air inlet pipe, and illustratively, a controller can be used for controlling the first air inlet pipe valve, and when the value detected by the first flow sensor 27 exceeds the preset value of the exhaust gas recirculation system, the opening degree of the first air inlet pipe valve 26 can be moderately reduced by the controller, so that the effect of automatically controlling the air flow rate of the first air inlet pipe is achieved.
Optionally, the exhaust gas recirculation system a further comprises a second intake conduit valve 23 and a second flow sensor 24;
the second outlet 22 of the exhaust gas recirculation steady pressure cavity 21 is connected with the first interface of the second air inlet pipeline valve 23, the second interface of the second air inlet pipeline valve 23 is connected, the second flow sensor 24 is arranged at the second interface of the second air inlet pipeline valve 23 and used for detecting the flow rate at the second interface of the second air inlet pipeline valve 23, and the second outlet (2) of the exhaust gas recirculation system A is connected with the third interface 3 of the air inlet system 2;
the flow rate at the second port of the second intake pipe valve 23 matches the opening degree of the second intake pipe valve 23.
Specifically, when the value detected by the second flow sensor 24 of the second air intake pipe is different from the result detected by the first flow sensor 27 of the first air intake pipe, the ratio of exhaust gas and air entering the first cylinder 6 and the second cylinder 5 can be intelligently and controllably adjusted according to the actual operation conditions, so that the problem of uneven EGR rates of the first cylinder 6 and the second cylinder 5 is solved. For example, a flow range may be preset in the exhaust gas recirculation system a, and when the values detected by the flow sensors are all smaller than the maximum value of the flow range set in the exhaust gas recirculation system a, only the opening of the intake pipe valve needs to be moderately increased, so that the flows entering the first cylinder 6 and the second cylinder 5 are the same; when the flow sensor detects a value having more than one value greater than the maximum value of the flow range set in the exhaust gas recirculation system a, the opening of the intake pipe valve is appropriately decreased so that the flow rates into the first cylinder 6 and the second cylinder 5 are the same.
The system can also calculate the EGR rates of the first cylinder 6 and the second cylinder 5, compare the calculated EGR rates with the EGR rates preset by the system, feed back the calculated EGR rates to a controller responsible for controlling the opening of the intake pipeline valve according to the comparison result, moderately adjust the opening of the intake pipeline valve, calculate the EGR rates of the first cylinder 6 and the second cylinder 5 after adjusting the opening of the intake pipeline valve again, compare the calculated EGR rates with the EGR rates preset by the system again, continue to execute the cycle until the EGR rates of the first cylinder 6 and the second cylinder 5 are the same as the preset EGR rates, and intelligently and controllably adjust the EGR rates as required.
Optionally, the extended-range two-cylinder engine exhaust gas recirculation system further comprises a heat exchange pipeline B, wherein the heat exchange pipeline B comprises an oil pan 12 of an oil tank and a heat exchanger 11;
an inlet of the heat exchanger 11 is connected to the first outlet 9 of the second cylinder 5, the heat exchanger 11 being arranged in an oil sump 12 of the oil tank;
the outlet of the heat exchanger 11 is connected to a tail pipe 18.
The heat exchange pipeline B is mainly responsible for heating the engine oil pan to realize quick warm-up. The heat exchanger 11 mainly functions as a means for transferring heat from a hot fluid to a cold fluid. Specifically, the heat exchanger 11 is arranged on the oil pan 12 of the oil tank, so that the waste gas discharged from the first outlet 9 of the second cylinder 5 can be transmitted to the oil pan 12 through the heat exchanger 11, the oil pan 12 of the oil tank can be quickly heated, quick warm-up is realized, and fuel consumption and emission are reduced.
Optionally, the extended-range two-cylinder engine exhaust gas recirculation system further comprises an engine oil heating pipeline valve 10 and an engine oil temperature sensor 13;
the first interface of the engine oil heating pipeline valve 10 is connected with the first outlet of the second cylinder 5, and the second interface of the engine oil heating pipeline valve 10 is connected with the inlet of the heat exchanger 11;
the engine oil temperature sensor 13 is used for detecting the engine oil temperature in the oil pan of the oil tank;
the temperature of the oil in the oil pan of the oil tank matches the opening of the oil heating pipe valve 10.
Wherein the locomotive heating circuit valve 13 is primarily responsible for opening or closing the heat exchange circuit B. Specifically, during cold start of the automobile, since the engine oil temperature is far lower than the temperature during normal operation, the system automatically opens the engine oil heating pipeline valve 10, so that the exhaust gas discharged from the first outlet 9 of the second cylinder 5 enters the heat exchanger 11, and the engine bottom shell 12 is quickly preheated through heat exchange treatment, thereby realizing quick warm-up and reducing fuel consumption and emission. The engine oil temperature sensor 13 monitors the engine oil temperature in real time, and when the engine oil temperature rises to the upper limit, the engine oil heating pipeline valve 10 is closed.
Optionally, the temperature of the oil in the oil pan of the oil tank is less than or equal to the first preset temperature, and the oil heating line valve 10 is opened.
For example, the first preset temperature may be set to an upper limit of the oil raised temperature, that is, the oil temperature when the automobile is normally running. When the automobile is started each time, the engine oil heating pipeline valve 10 is opened to heat the engine oil temperature as long as the engine oil temperature in the oil pan of the oil tank is detected to be lower than the upper limit of the engine oil rising temperature.
Optionally, the extended-range two-cylinder engine exhaust gas recirculation system further comprises an energy recovery pipeline C;
the energy recovery pipeline C comprises an air storage tank 16, a thermoelectric generator 17 and an energy storage device;
the inlet of the air storage tank 16 is connected with the second outlet 14 of the second cylinder 5;
the gas inlet of the thermoelectric generator 17 is connected with the outlet of the gas storage tank 16, and the electric energy output end of the thermoelectric generator 17 is connected with the input end of the energy storage device.
Wherein, the energy recovery pipeline C stores the surplus energy in another form. The purpose of the air reservoir 16 is to store the exhaust gases from the second outlet 14 of the second cylinder 5. The thermoelectric generator 17 is a power generation device that converts thermal energy of exhaust gas into electric energy by a thermocouple principle. Specifically, the air inlet of the thermoelectric generator 17 is connected with the outlet of the air storage tank 16, the electric energy output end of the thermoelectric generator 17 is connected with the input end of the energy storage device, and the waste gas discharged from the second outlet 14 of the second cylinder 5 can be converted into electric energy through the thermoelectric generator 17 and stored in the energy storage device. The energy storage device may be a capacitive energy storage device, an inductive energy storage device, a storage battery, and the like, which is not limited in the embodiment of the present invention.
Optionally, the energy storage device comprises a battery.
Specifically, the storage battery is used as an energy storage device, so that electric energy can be continuously provided for the system.
Optionally, the energy recovery line C further comprises an energy recovery line valve 15;
the first port of the energy recovery pipeline valve 15 is connected with the second outlet of the second cylinder 5, and the second port of the energy recovery pipeline valve 15 is connected with the inlet of the air storage tank 16;
the temperature of the engine oil in the oil pan of the oil tank matches the opening of the energy recovery line valve 15.
Specifically, the energy recovery line valve 15 mainly controls the opening and closing of the energy recovery line C. When the temperature of the engine oil in the oil pan of the oil tank reaches the upper limit, the engine oil heating pipeline valve 10 is closed, the energy recovery pipeline valve 15 is opened, the exhaust energy is used for generating electricity by utilizing the temperature difference of the exhaust energy, and the exhaust energy is recovered.
Optionally, the temperature of the engine oil in the oil pan of the oil tank is less than or equal to the second preset temperature, the engine oil heating line valve 10 is opened, and the energy recovery line valve 15 is closed.
The temperature of the engine oil in the oil pan of the oil tank is greater than the second preset temperature, the energy recovery line valve 15 is opened, and the engine oil heating line valve 10 is closed.
Wherein the second preset temperature is the same as the first preset temperature. Specifically, the temperature of the engine oil in the oil pan of the oil tank is less than or equal to the second preset temperature, the engine oil heating pipeline valve 10 is opened, and the energy recovery pipeline valve 15 is closed, so that the exhaust gas discharged from the second cylinder 5 can be concentrated to heat the engine oil pan, and the exhaust gas energy dispersion is avoided, so that the engine oil heating and energy recovery efficiency is not high. The engine oil temperature in the oil pan of the oil tank is greater than the second preset temperature, the energy recovery pipeline valve 15 is opened, the engine oil heating pipeline valve 10 is closed, and under the condition of completing quick warm-up, the exhaust gas discharged from the second cylinder 5 is concentrated to be used for recovering the energy of the exhaust gas, so that a larger energy-saving effect can be achieved.
According to the extended-range two-cylinder engine exhaust gas recirculation system provided by the embodiment of the invention, the outlet of the first cylinder 6 is connected with the inlet of the exhaust gas recirculation system through the exhaust manifold 8, so that the exhaust pressure of a single cylinder is higher, and a larger EGR rate is realized. The design of the second air inlet pipeline valve 23 and the first air inlet pipeline valve 26 in the exhaust gas recirculation system can intelligently and controllably adjust the proportion of waste gas and air entering the first cylinder 6 and the second cylinder 5 according to actual running conditions, solves the problem of uneven EGR rate of the first cylinder 6 and the second cylinder 5, so as to achieve optimal economical matching, and has larger fuel saving potential. The design of the heat exchange pipeline B transmits heat in the exhaust gas to the oil pan 12 through the heat exchanger 11, so that the engine oil pan 12 can be quickly heated, quick warm-up is realized, and fuel consumption and emission are reduced. The design of the energy recovery pipeline C converts the heat energy of the waste gas discharged from the second outlet 14 of the second cylinder 5 into electric energy through the thermoelectric generator 17 and stores the electric energy into the storage battery, so that the recovery of the energy of the waste gas is realized.
Example two
Fig. 2 is a flowchart of a method for providing an extended-range two-cylinder engine exhaust gas recirculation system according to a second embodiment of the present invention, and specifically described below with reference to fig. 2:
when the system inputs a start command, whether the engine works or not is firstly judged, and if the engine does not work, the start command is continuously returned to perform circulation. If the engine is already working, the two operation steps of opening the valve of the exhaust gas recirculation pipeline and judging whether the temperature value of the engine oil temperature measuring sensor is larger than the first preset temperature are carried out simultaneously. First, a detailed description will be given of the branch of "exhaust gas recirculation line valve is open", and after the exhaust gas recirculation line valve is opened, the first intake line valve that enters the first cylinder and the second intake line that enters the second cylinder are controlled by PIDThe opening of the valve, and thus the EGR rates of the first cylinder and the second cylinder, are compared with the target EGR rate set by the system, and fed back to the PID control system, and the EGR rates of the first cylinder and the second cylinder are adjusted again. Finally, a detailed description will be made of the branch of "judging whether the temperature value of the oil temperature sensor 13 is greater than the first preset temperature" when the temperature value T of the oil temperature sensor 13 is WL Less than or equal to a first preset temperature T W When the engine oil heating pipeline valve 10 is opened, the energy recovery pipeline valve 15 is closed, the heat exchanger 11 starts to work, and the engine bottom shell 12 is quickly preheated through heat exchange treatment, so that quick warm-up is realized. When the temperature value T of the engine oil temperature measuring sensor 13 WL Is greater than a first preset temperature T W When the engine oil heating pipeline valve 10 is closed, the energy recovery pipeline valve 15 is opened, the heat exchanger 11 stops working, the thermoelectric generator 17 starts working, and the heat energy of the waste gas is converted into electric energy to be stored in the storage battery.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.

Claims (10)

1. An extended range two-cylinder engine exhaust gas recirculation system, comprising:
an air cleaner, an air intake system, a first cylinder, a second cylinder, and an exhaust gas recirculation system;
the outlet of the air filter is connected with a first interface of the air inlet system;
the second interface of the air inlet system is connected with the inlet of the first cylinder, the outlet of the first cylinder is connected with the inlet of the exhaust gas recirculation system, and the first outlet of the exhaust gas recirculation system is connected with the second interface of the air inlet system;
the third interface of the air inlet system is connected with the inlet of the second cylinder, and the outlet of the second cylinder is connected with the tail pipe.
2. The extended range two-cylinder engine exhaust gas recirculation system of claim 1,
the exhaust gas recirculation system comprises an exhaust gas recirculation pipeline valve, an exhaust gas recirculation pressure stabilizing cavity, a first air inlet pipeline valve and a first flow sensor;
the outlet of the first cylinder is connected with a first interface of the exhaust gas recirculation pipeline valve;
the second interface of the exhaust gas recirculation pipeline valve is connected with the inlet of the exhaust gas recirculation pressure stabilizing cavity;
the first outlet of the exhaust gas recirculation pressure stabilizing cavity is connected with the first interface of the first air inlet pipeline valve, the second interface of the first air inlet pipeline valve is connected, the first flow sensor is arranged at the second interface of the first air inlet pipeline valve and used for detecting the flow of the second interface of the first air inlet pipeline valve, and the first outlet of the exhaust gas recirculation system is connected with the second interface of the air inlet system;
the flow rate at the second interface of the first air inlet pipeline valve is matched with the opening degree of the first air inlet pipeline valve.
3. The extended range two-cylinder engine exhaust gas recirculation system of claim 2, further comprising a second intake conduit valve and a second flow sensor;
the second outlet of the exhaust gas recirculation pressure stabilizing cavity is connected with the first interface of the second air inlet pipeline valve, the second interface of the second air inlet pipeline valve is connected, the second flow sensor is arranged at the second interface of the second air inlet pipeline valve and used for detecting the flow of the second interface of the second air inlet pipeline valve, and the second outlet of the exhaust gas recirculation system is connected with the third interface of the air inlet system;
the flow rate at the second interface of the second air inlet pipeline valve is matched with the opening degree of the second air inlet pipeline valve.
4. The extended range two-cylinder engine exhaust gas recirculation system of claim 1, further comprising a heat exchange line comprising an oil pan of an oil tank and a heat exchanger;
the inlet of the heat exchanger is connected with the first outlet of the second cylinder, and the heat exchanger is arranged at the oil pan of the oil tank;
the outlet of the heat exchanger is connected with the tail pipe.
5. The extended range two-cylinder engine exhaust gas recirculation system of claim 4, further comprising an oil heating line valve and an oil temperature sensor;
the first interface of the engine oil heating pipeline valve is connected with the first outlet of the second cylinder, and the second interface of the engine oil heating pipeline valve is connected with the inlet of the heat exchanger;
the engine oil temperature measuring sensor is used for detecting the engine oil temperature in the oil pan of the oil tank;
the temperature of the engine oil in the oil pan of the oil tank is matched with the opening degree of the engine oil heating pipeline valve.
6. The extended range two-cylinder engine exhaust gas recirculation system of claim 5, wherein the temperature of the oil within the sump of the oil tank is less than or equal to a first preset temperature, and the oil heating line valve is open.
7. The extended range two-cylinder engine exhaust gas recirculation system of claim 5, further comprising an energy recovery circuit;
the energy recovery pipeline comprises an air storage tank, a thermoelectric generator and an energy storage device;
the inlet of the air storage tank is connected with the second outlet of the second cylinder;
the air inlet of the thermoelectric generator is connected with the outlet of the air storage tank, and the electric energy output end of the thermoelectric generator is connected with the input end of the energy storage device.
8. The extended range two-cylinder engine exhaust gas recirculation system of claim 7, wherein the energy storage device comprises a battery.
9. The extended range two-cylinder engine exhaust gas recirculation system of claim 7, wherein the energy recovery line further comprises an energy recovery line valve;
the first port of the energy recovery pipeline valve is connected with the second outlet of the second cylinder, and the second port of the energy recovery pipeline valve is connected with the inlet of the air storage tank;
the temperature of the engine oil in the oil pan of the oil tank is matched with the opening degree of the energy recovery pipeline valve.
10. The extended range two-cylinder engine exhaust gas recirculation system of claim 9,
the temperature of the engine oil in the oil pan of the oil tank is smaller than or equal to a second preset temperature, the engine oil heating pipeline valve is opened, and the energy recovery pipeline valve is closed.
The temperature of the engine oil in the oil pan of the oil tank is higher than a second preset temperature, the energy recovery pipeline valve is opened, and the engine oil heating pipeline valve is closed.
CN202211387477.0A 2022-11-07 2022-11-07 Exhaust gas recirculation system of range-extended two-cylinder engine Pending CN116085152A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016113316A1 (en) * 2015-07-21 2017-01-26 Avl List Gmbh Internal combustion engine
US20170363057A1 (en) * 2016-06-16 2017-12-21 Southwest Research Institute Dedicated exhaust gas recirculation engine fueling control
CN209875331U (en) * 2019-02-21 2019-12-31 中国第一汽车股份有限公司 A high pressure EGR device
CN115234412A (en) * 2022-06-30 2022-10-25 中国第一汽车股份有限公司 Exhaust gas recirculation system, control method, engine and vehicle

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016113316A1 (en) * 2015-07-21 2017-01-26 Avl List Gmbh Internal combustion engine
US20170363057A1 (en) * 2016-06-16 2017-12-21 Southwest Research Institute Dedicated exhaust gas recirculation engine fueling control
CN209875331U (en) * 2019-02-21 2019-12-31 中国第一汽车股份有限公司 A high pressure EGR device
CN115234412A (en) * 2022-06-30 2022-10-25 中国第一汽车股份有限公司 Exhaust gas recirculation system, control method, engine and vehicle

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