CN115263624A - An EGR system for an engine and its control method - Google Patents

Abstract

The invention discloses an EGR system for an engine and a control method thereof, wherein the EGR system is characterized in that it includes an energy recovery exhaust pipeline and an EGR exhaust pipeline, and the energy recovery exhaust pipeline is One end is connected to the exhaust end of at least one first cylinder of the engine, one end of the EGR exhaust line is connected to the exhaust end of at least one second cylinder of the engine, and the energy recovery exhaust line The other end of the EGR exhaust pipe is connected to the exhaust tail pipe through the oil heating pipe and the thermoelectric power generation pipe, respectively, and a thermoelectric power generation system is set on the thermoelectric power generation pipe. system connection. The present invention divides the exhaust pipeline into an energy recovery pipeline and an EGR pipeline, so that the exhaust gas of the EGR pipeline is directly connected to the engine intake, and the EGR rate can be improved. Comprehensive utilization of exhaust gas and improved energy utilization.

Description

A kind of EGR system for engine and its control method

technical field

The present invention relates to the technical field of EGR control of vehicles, in particular to an EGR system for an engine and a control method thereof.

Background technique

With the development of internal combustion engine technology, the engine is developing towards high thermal efficiency and low emission. Exhaust gas recirculation (EGR, Exhaust Gas Recirculation) is an effective measure to reduce the generation of NOx gas in the engine cylinder. Its working principle is: part of the exhaust gas of the engine is sent back to the engine cylinder after passing through the turbine to participate in the combustion process. The gas composition in the combustion chamber comes from two parts, one part is the fresh air cooled by the intercooler, and the other part is the exhaust gas taken from the exhaust manifold and cooled by the EGR cooler.

However, after passing through the turbine, the exhaust pressure decreases, and it is difficult to achieve a higher EGR rate. If you want to achieve a higher EGR rate, you need an additional exhaust back pressure valve (increase the pressure at the exhaust end) or an intake mixing valve ( Intake end pressurized negative pressure) to increase the pressure difference between the exhaust and intake sides, but both of these methods will increase the pumping loss and reduce fuel economy.

At the same time, in the cold start stage of the car, since the engine water temperature is much lower than the normal operating temperature (90°C), the fuel consumption and emissions of the engine will deteriorate during the slow heating process. Therefore, the engine warm-up time is shortened to achieve rapid warm-up. It can significantly reduce the engine fuel consumption rate and improve the emission of harmful pollutants. In addition, during the normal operation stage of the engine, the exhaust gas temperature is too high to limit the EGR rate of the exhaust gas recirculation system, usually the maximum EGR rate is not more than 25%, the energy of the exhaust gas cannot be fully utilized, and the fuel saving potential needs to be further improved.

Therefore, how to increase the exhaust gas recirculation rate, reduce emissions, and improve energy utilization efficiency is one of the current problems to be solved urgently.

Contents of the invention

The present disclosure provides an EGR system for an engine and a control method thereof, so as to at least solve the technical problem that the existing EGR cannot achieve a higher EGR rate.

According to an aspect of an embodiment of the present invention, there is provided an EGR system for an engine, comprising an energy recovery exhaust pipeline and an EGR exhaust pipeline, one end of the energy recovery exhaust pipeline is connected to at least one end of the engine The exhaust end of a first cylinder is connected, one end of the EGR exhaust pipeline is connected to the exhaust end of at least one second cylinder of the engine, and the other end of the energy recovery exhaust pipeline is heated by engine oil The pipeline and the thermoelectric power generation pipeline are connected with the exhaust tailpipe, a thermoelectric power generation system is arranged on the thermoelectric power pipeline, and the other end of the EGR exhaust pipeline is connected with the intake system of the engine.

In an exemplary embodiment, a first valve is set on the oil heating pipeline, and a second valve is set on the thermoelectric power generation pipeline.

In an exemplary embodiment, a heat exchanger is arranged on the oil heating pipeline, and the heat exchanger is used to exchange heat with the oil in the oil pan.

In an exemplary embodiment, the thermoelectric power generation system includes a gas storage tank connected to a power generation device.

In an exemplary embodiment, a third valve is provided on the EGR exhaust pipeline, the other end of the EGR exhaust pipeline is connected to one end of the pressure stabilizing chamber, and the other end of the pressure stabilizing chamber is passed through different The EGR intake pipelines are respectively connected to intake manifolds corresponding to different cylinders in the engine.

In an exemplary embodiment, a fourth valve is respectively set on each of the EGR intake pipelines.

In an exemplary embodiment, the power generating device is connected to a battery.

In a second aspect, the present disclosure also provides an engine, which adopts the EGR system described in any one of the above technical solutions.

In a third aspect, the present disclosure further provides a vehicle, which includes the engine described in any one of the above technical solutions.

In a fourth aspect, the present disclosure also provides a method for controlling an EGR system, where the EGR system is the EGR system described in any of the above technical solutions, and the control method includes:

When the temperature of the oil in the oil pan is less than the preset threshold, open the oil heating pipeline and close the thermoelectric power generation pipeline to heat the oil pan; when the temperature of the oil in the oil pan is greater than or equal to the preset threshold When the threshold is set, the oil heating pipeline is closed and the thermoelectric power generation pipeline is opened to generate power through the thermoelectric power generation system.

In a fifth aspect, the present disclosure also provides a control device for an EGR system, the device comprising: a first control module and a second control module, wherein the first control module is used to control the EGR valve based on the engine operating state, and the The second control module is used to control the oil heating circuit control valve and the thermoelectric generation circuit control valve based on the engine oil temperature.

As can be seen from the above, in the present disclosure, by dividing the exhaust pipeline into an energy recovery pipeline and an EGR pipeline, the exhaust gas of the EGR pipeline is directly connected to the intake air of the engine to provide high-pressure exhaust gas for the engine, thereby improving EGR rate, EGR valves are set on the pipelines of each cylinder, so that the EGR rate of each cylinder can be adjusted, and the comprehensive utilization of exhaust gas is realized by setting the oil heating pipeline and the thermoelectric power generation pipeline, which improves the energy utilization rate.

In order to make the above-mentioned objects, features and advantages of the present disclosure more comprehensible, preferred embodiments will be described in detail below together with the accompanying drawings.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention and constitute a part of the application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention. In the attached picture:

FIG. 1 is a schematic structural diagram of an engine EGR system provided by the present disclosure;

Fig. 2 is a working principle diagram of the EGR system provided by the present disclosure;

Fig. 3 is a flow chart of the steps of the control method of the EGR system provided by the present disclosure;

Fig. 4 is a structural schematic diagram of a control device of an EGR system provided by the present disclosure.

Detailed ways

Below, specific embodiments of the present disclosure will be described in detail in conjunction with the accompanying drawings, but they are not intended to limit the present disclosure.

It should be understood that various modifications may be made to the embodiments disclosed herein. Accordingly, the above description should not be viewed as limiting, but only as exemplifications of embodiments. Those skilled in the art will envision other modifications within the scope and spirit of the disclosure.

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and, together with the general description of the disclosure given above and the detailed description of the embodiments given below, serve to explain the embodiments of the disclosure. principle.

These and other characteristics of the present disclosure will become apparent from the following description of preferred forms of embodiment given as non-limiting examples with reference to the accompanying drawings.

It should also be understood that, while the disclosure has been described with reference to a few specific examples, those skilled in the art will surely be able to implement many other equivalents of the disclosure which have the features of the claims and which are therefore situated within the scope of the claims. within the limited scope of protection.

The above and other aspects, features and advantages of the present disclosure will become more apparent in view of the following detailed description when taken in conjunction with the accompanying drawings.

Specific embodiments of the present disclosure are hereinafter described with reference to the accompanying drawings; however, it is to be understood that the disclosed embodiments are merely examples of the disclosure, which may be embodied in various ways. Well-known and/or repetitive functions and constructions are not described in detail to avoid obscuring the disclosure with unnecessary or redundant detail. Therefore, specific structural and functional details disclosed herein are not intended to be limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present invention in virtually any suitable detailed structure. public.

It should be noted that the terms "first" and "second" in the specification and claims of the present disclosure and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the disclosure described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a sequence of steps or elements is not necessarily limited to the expressly listed instead, may include other steps or elements not explicitly listed or inherent to the process, method, product or apparatus.

This specification may use the phrases "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments," which may refer to the same or one or more of the different embodiments.

The present disclosure will be further described below in conjunction with the accompanying drawings and specific embodiments.

Example 1

The first aspect of the present disclosure provides an EGR system for an engine, wherein the EGR means that a part of the exhaust gas of the engine is cooled and then sent back to the engine cylinder through the engine air intake system to participate in the combustion process, thereby reducing Combustion temperature, the process of suppressing the formation of NOx.

When the exhaust gas enters the engine cylinder from the exhaust pipe and the intake system, the pressure of the exhaust gas will gradually decrease, making it impossible to achieve a high EGR rate, and boosting the exhaust gas will increase the pumping loss and reduce the Engine fuel efficiency.

In order to achieve a high EGR rate of the engine and improve the fuel efficiency of the engine, an embodiment of the present disclosure provides an EGR system for the engine. Fig. 1 is a structural schematic diagram of an engine EGR system in an embodiment of the disclosure, as shown in the figure, taking a four-cylinder engine as an example, the engine includes an air filter 1, and the air filter 1 is connected with the intake system of the engine 2 connection, the intake system 2 is connected with the first cylinder intake manifold 3, the intake manifold 4 of the second cylinder, the intake manifold 5 of the third cylinder and the intake manifold 6 of the fourth cylinder respectively with the first cylinder 7. The second cylinder 8, the third cylinder 9 and the fourth cylinder 10 are in communication. The EGR system for the engine includes an energy recovery exhaust pipeline 11 and an EGR exhaust pipeline. The energy recovery exhaust pipeline 11 is used to recover the energy in the exhaust gas of the engine, and one end thereof is connected to the The exhaust ends of the first cylinder 7 and the second cylinder 8 of the engine are connected, and the EGR exhaust pipeline is used to introduce the exhaust gas of the engine into the intake system of the engine to realize exhaust gas recirculation. One end of the EGR exhaust pipeline is connected to the exhaust ends of the third cylinder 9 and the fourth cylinder 10 of the engine, and the other end of the energy recovery exhaust pipeline 11 passes through the oil heating pipeline 12 and the temperature difference The power generation pipeline 17 is connected to the exhaust tailpipe 22 , an oil heating device is arranged on the oil heating pipeline 12 , and a thermoelectric power generation system is set on the thermoelectric power generation pipeline 17 .

Further, the oil heating device includes an oil heat exchanger 14, the oil heat exchanger 14 communicates with the energy recovery pipeline 11 through the oil heating pipeline 12, and the oil heat exchanger 14 is configured to utilize exhaust gas Heat the oil. When the vehicle starts cold, since the temperature of the engine oil is much lower than the temperature during normal operation (90°C), the fuel consumption and emission of the engine will deteriorate during the slow heating process. At this time, the exhaust gas from the engine is used to heat the engine oil to achieve rapid Warm up the engine, reducing fuel consumption and emissions. Optionally, the oil heating device also includes an oil heating exhaust pipeline, an oil pan 15 and an oil temperature sensor 16; the two ends of the oil heating exhaust pipeline 23 communicate with the exhaust tailpipe 22 and the oil heat exchanger 14 respectively, Used to transport the exhaust gas discharged from the engine; the oil heat exchanger 14 uses the energy of the exhaust gas to heat the oil in the oil pan 15, and measures the real-time temperature of the oil through the temperature sensor 16, which is convenient for monitoring.

Further, the oil heating device further includes an oil heating exhaust pipeline valve 13 , which is located on the oil heating pipeline 12 and is used to control whether the oil heating exhaust pipeline 12 is connected or not. After the temperature of the heated engine oil reaches the preset threshold, the oil heating exhaust pipeline valve 12 is closed, and the exhaust gas is no longer used to heat the engine oil, so as to avoid excessive temperature of the engine oil.

Further, the thermoelectric power generation system 20 is set in the gas storage tank 19, one end of the gas storage tank 19 is connected to the energy recovery exhaust pipeline 11, and the other end is communicated with the exhaust tail pipe 22, and the gas storage tank 19 is The gas tank 19 is used to store exhaust gas discharged from the engine. The thermoelectric power generation system 20 is configured to convert the energy of exhaust gas into electrical energy. The thermoelectric power generation system 20 includes a thermoelectric generator (not shown in the figure), through which the energy of the exhaust gas is converted, heat energy is converted into electrical energy, and the storage battery 21 is charged, and the storage battery 21 can be the The accessories of the engine, including but not limited to EGR pumps, fuel pumps, etc., provide electrical power.

In order to control the thermoelectric power generation system, the thermoelectric power generation system also includes a thermoelectric power generation pipeline valve 18, and the thermoelectric power generation pipeline valve 18 is located on the thermoelectric power generation pipeline 17 for controlling whether the thermoelectric power generation pipeline 17 is connected or not. In the cold start stage of the engine, when the actual temperature of the engine oil does not reach the lower limit of the oil temperature, it is necessary to close the thermoelectric power generation pipeline valve 18, and use all the exhaust gas to heat the engine oil through the oil heat exchanger 14, so as to achieve the purpose of fast warm-up. When the actual temperature of the engine oil reaches the lower limit of the engine oil temperature, the thermoelectric power generation pipeline valve 18 is opened.

In a specific embodiment, an EGR pipeline valve 24 is provided on the EGR exhaust pipeline 23, and the EGR pipeline valve 24 is used to control the opening and closing of the EGR pipeline. During operation, the EGR pipeline valve is in a normally open state.

Further, the EGR system also includes a plenum chamber 25, one end of the plenum chamber 25 is connected to the EGR exhaust pipeline 23, and the other end of the plenum chamber 25 is connected to the plenum through a different EGR intake pipeline. The intake manifolds corresponding to different cylinders in the engine are respectively connected. As shown in the figure, the pressure stabilizing chamber 25 passes through the EGR intake pipeline 26 of the first cylinder, the EGR intake pipeline 27 of the second cylinder, and the third cylinder EGR intake pipeline respectively. The EGR intake pipeline 28 and the fourth cylinder EGR intake pipeline 29 are connected with the intake manifold 3 of the first cylinder, the intake manifold 4 of the second cylinder, the intake manifold 5 of the third cylinder and the intake manifold of the fourth cylinder Pipe 6 is connected to realize that the exhaust gas of the third cylinder and the fourth cylinder is sent into the intake manifold of each cylinder of the engine.

In order to precisely control the EGR rate of each cylinder of the engine, the EGR system further includes a plurality of EGR intake pipeline valves, and the plurality of EGR intake pipeline valves are installed on the EGR intake pipeline of each cylinder. Taking the four-cylinder engine in the present disclosure as an example, the EGR intake pipeline valve 30 of the first cylinder is located on the EGR intake pipeline 26 of the first cylinder, and the EGR intake pipeline valve 32 of the second cylinder is located on the EGR intake pipeline 27 of the second cylinder , the third cylinder EGR intake pipeline valve 35 is located on the third cylinder EGR intake pipeline 28, the fourth cylinder EGR intake pipeline valve 36 is located on the fourth cylinder EGR intake pipeline 29, these four pipeline valves respectively control the first A cylinder EGR intake pipeline 26, a second cylinder EGR intake pipeline 27, a third cylinder EGR intake pipeline 28 and a fourth cylinder EGR intake pipeline 29 are connected to the first cylinder intake manifold 3 and the second cylinder intake manifold 3. The communication between the air manifold 4 , the intake manifold 5 of the third cylinder and the intake manifold 6 of the fourth cylinder.

On the EGR intake pipeline of each cylinder, there are also EGR flow sensors for measuring the exhaust gas flow and pressure, specifically, the first cylinder EGR flow sensor 31, the second cylinder EGR flow sensor 33, the third cylinder EGR flow sensor 34 and The fourth cylinder EGR flow sensor 37 monitors the flow and pressure of exhaust gas entering the first cylinder 7 , the second cylinder 8 , the third cylinder 9 and the fourth cylinder 10 respectively. According to the engine running conditions during the actual driving process of the vehicle, the intake pipe valve of the cylinder can intelligently adjust the ratio of exhaust gas and air entering each cylinder, reduce the unevenness of exhaust gas of each cylinder, achieve the optimal economic matching, and fully tap the fuel-saving potential of the system At the same time, the exhaust gas of the third cylinder and the fourth cylinder in the present disclosure directly enters the intake air, which can provide high-pressure exhaust gas for the engine and break the limit of the maximum EGR rate of the conventional exhaust gas recirculation system.

It can be seen that the EGR system provided by the embodiments of the present disclosure divides the exhaust pipeline into an energy recovery pipeline and an EGR pipeline, so that the exhaust gas of the EGR pipeline is directly connected to the intake air of the engine to provide high-pressure exhaust gas for the engine, thereby The EGR rate can be increased, and EGR valves are installed on the pipelines of each cylinder, so that the EGR rate of each cylinder can be adjusted. By setting the oil heating pipeline and the thermoelectric power generation pipeline, the comprehensive utilization of exhaust gas is realized, and the energy utilization rate is improved.

Example 2

The second aspect of the present disclosure also provides an engine, which adopts the EGR system described in any one of the above-mentioned embodiments.

Specifically, the EGR system includes an energy recovery exhaust pipeline 11 and an EGR exhaust pipeline, one end of the energy recovery exhaust pipeline 11 is connected to the exhaust end of at least one first cylinder of the engine, so One end of the EGR exhaust pipeline is connected to the exhaust end of at least one second cylinder of the engine, and the other end of the energy recovery exhaust pipeline is connected to the exhaust tail through the oil heating pipeline and the thermoelectric power generation pipeline respectively. The pipe is connected, and a thermoelectric power generation system is set on the thermoelectric power generation pipeline.

The engine provided by the embodiments of the present disclosure divides the exhaust pipeline into an energy recovery pipeline and an EGR pipeline, so that the exhaust gas of the EGR pipeline is directly connected to the intake air of the engine to provide high-pressure exhaust gas for the engine, thereby improving the EGR rate , EGR valves are installed on the pipelines of each cylinder, so that the EGR rate of each cylinder can be adjusted, and the comprehensive utilization of exhaust gas is realized by setting the oil heating pipeline and the thermoelectric power generation pipeline, which improves the energy utilization rate.

Example 3

The third aspect of the present disclosure also provides a vehicle, the vehicle includes the engine described in any one of the above embodiments, wherein the engine is a fuel engine.

Specifically, the vehicle includes an engine, wherein the engine has an EGR system, which includes an energy recovery exhaust pipeline 11 and an EGR exhaust pipeline, and one end of the energy recovery exhaust pipeline 11 is connected to at least one end of the engine. The exhaust end of a first cylinder is connected, one end of the EGR exhaust pipeline is connected to the exhaust end of at least one second cylinder of the engine, and the other end of the energy recovery exhaust pipeline is heated by engine oil The pipeline and the thermoelectric power generation pipeline are connected with the exhaust tailpipe, and a thermoelectric power generation system is arranged on the thermoelectric power generation pipeline.

The vehicle provided by the embodiments of the present disclosure divides the exhaust pipeline into an energy recovery pipeline and an EGR pipeline, so that the exhaust gas of the EGR pipeline is directly connected to the intake air of the engine to provide high-pressure exhaust gas for the engine, thereby increasing the EGR rate. EGR valves are installed on the pipelines of each cylinder, so that the EGR rate of each cylinder can be adjusted. By setting the oil heating pipeline and the thermoelectric power generation pipeline, the comprehensive utilization of exhaust gas is realized, and the energy utilization rate is improved.

Example 4

In order to ensure the precise control of the EGR rate by the EGR system, the fourth aspect of the present disclosure also provides a control method for the EGR system. The EGR system is the EGR system described in any of the above embodiments, which is applied to the engine Wherein, the engine is a fuel engine.

As shown in Figure 2, Figure 2 shows a working principle diagram of the EGR system provided by the present disclosure, and the control method includes:

First, the EGR valve is controlled based on engine operating conditions.

In this step, the current working state of the engine is detected, and when it is detected that the engine is in the working state, the EGR pipeline valve is opened; the exhaust gas of the third cylinder and the fourth cylinder of the engine passes through the EGR pipe into the intake manifold of each cylinder of the engine.

Secondly, the oil heating pipeline control valve and the thermoelectric power generation pipeline control valve are controlled based on the engine oil temperature.

After the above steps are completed, in this step, the engine oil temperature is obtained, and the oil heating pipeline control valve and the thermoelectric power generation pipeline control valve are controlled based on the engine oil temperature, as shown in Figure 3, the EGR system The control method comprises the following steps:

S101. When the temperature of the oil in the oil pan is lower than a preset threshold, open the oil heating pipeline and close the thermoelectric power generation pipeline to heat the oil pan.

In this step, when the detected oil temperature in the oil pan 15 of the engine is lower than a preset threshold, the oil heating pipeline valve 13 on the oil heating pipeline 12 is opened and the oil heating pipeline valve 13 located on the temperature difference is closed. The thermoelectric power generation pipeline valve 18 on the power generation pipeline 17 is used to heat the engine oil in the oil pan 15 .

Specifically, when the car is cold started, since the engine oil temperature is much lower than the temperature during normal operation, by closing the thermoelectric power generation pipeline valve 18, all the exhaust gas discharged from the energy recovery pipeline can pass through the oil heating exhaust pipeline 17 Heat the engine oil to achieve the purpose of fast warm-up and reduce fuel consumption and emissions.

S102. When the temperature of the engine oil in the oil pan is greater than or equal to the preset threshold, close the oil heating pipeline and open the thermoelectric power generation pipeline to generate power through the thermoelectric power generation system.

Specifically, according to the real-time monitoring of the temperature of the engine oil in the oil pan 15 of the engine by the temperature sensor 16, after the temperature of the engine oil rises above a preset threshold, the cold start phase of the engine ends, and the engine enters the normal operation phase . At this time, the exhaust gas is no longer needed to heat the machine oil in the engine oil pan, therefore, the oil heating exhaust pipeline valve 13 is closed, and the machine oil heat exchanger 14 stops working. All the waste gas discharged from the energy recovery pipeline 11 enters the gas storage tank 19 through the thermoelectric power generation pipeline 17, and the thermoelectric power generation system 20 uses the energy of all the waste gas to perform thermoelectric power generation, and then charges the storage battery 21, so as to Realize reaching the target electric quantity of accumulator 21 charging as soon as possible.

The control method of the EGR system provided by the embodiments of the present disclosure divides the exhaust pipeline into an energy recovery pipeline and an EGR pipeline, so that the exhaust gas of the EGR pipeline is directly connected to the intake air of the engine to provide high-pressure exhaust gas for the engine, thereby The EGR rate can be increased, and EGR valves are installed on the pipelines of each cylinder, so that the EGR rate of each cylinder can be adjusted. By setting the oil heating pipeline and the thermoelectric power generation pipeline, the comprehensive utilization of exhaust gas is realized, and the energy utilization rate is improved.

Example 5

In order to better implement the above method, a fifth aspect of the present disclosure further provides a control device for an EGR system, which can be integrated into an electronic device.

For example, as shown in FIG. 4, the control device 200 of the EGR system may include: a first control module 210 and a second control module 220, specifically as follows:

(1) The first control module 210 is used for controlling the EGR valve based on the operating state of the engine.

Specifically, the first control module 210 includes an engine working state collection unit and an EGR valve control unit, wherein the engine working state collection unit is used to collect the working state of the engine, and the EGR valve control unit is based on the working state of the engine The state controls opening and closing of the EGR valve.

(2) The second control module 220 is used for controlling the oil heating pipeline control valve and the thermoelectric power generation pipeline control valve based on the engine oil temperature.

Specifically, the second control module 220 includes an engine oil temperature acquisition unit and a pipeline control unit, wherein the engine oil temperature acquisition unit acquires the temperature of the engine oil in the engine oil pan, and the pipeline control unit is based on the oil temperature Temperature control engine oil heating pipeline control valve and thermoelectric power generation pipeline control valve.

Further, when the temperature of the oil in the oil pan is less than a preset threshold, the oil heating pipeline is opened and the thermoelectric power generation pipeline is closed to heat the oil pan; when the temperature of the oil in the oil pan is greater than or equal to When the preset threshold is reached, the oil heating pipeline is closed and the thermoelectric power generation pipeline is opened to generate electricity through the thermoelectric power generation system.

The control device of the EGR system provided by the embodiments of the present disclosure controls the opening and closing of the oil heating pipeline and the thermoelectric power generation pipeline based on the temperature of the oil in the oil pan, thereby realizing the comprehensive utilization of the engine exhaust and improving the the energy utilization rate.

It should be noted that the storage medium mentioned above in the present disclosure may be a computer-readable signal medium or a computer-readable storage medium or any combination of the two. A computer readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to, electrical connections with one or more wires, portable computer diskettes, hard disks, random access memory (RAM), read-only memory (ROM), erasable Programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination of the above. In the present disclosure, a computer-readable storage medium may be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. In the present disclosure, however, a computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave carrying computer-readable program code therein. Such propagated data signals may take many forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the foregoing. A computer-readable signal medium may also be any storage medium other than a computer-readable storage medium that can transmit, propagate, or transport a program for use by or in conjunction with an instruction execution system, apparatus, or device. Program code contained on a storage medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (radio frequency), etc., or any suitable combination of the above.

The flowchart and block diagrams in the Figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in a flowchart or block diagram may represent a module, program segment, or portion of code that contains one or more logical functions for implementing specified executable instructions. It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or they may sometimes be executed in the reverse order, depending upon the functionality involved. It should also be noted that each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by a dedicated hardware-based system that performs the specified functions or operations , or may be implemented by a combination of dedicated hardware and computer instructions.

The units involved in the embodiments described in the present disclosure may be implemented by software or by hardware. Wherein, the name of a unit does not constitute a limitation of the unit itself under certain circumstances.

The functions described herein above may be performed at least in part by one or more hardware logic components. For example, without limitation, exemplary types of hardware logic components that may be used include: Field Programmable Gate Arrays (FPGAs), Application Specific Integrated Circuits (ASICs), Application Specific Standard Products (ASSPs), System on Chips (SOCs), Complex Programmable Logical device (CPLD) and so on.

In the context of the present disclosure, a machine-readable medium may be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, apparatus, or device. A machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. More specific examples of machine-readable storage media would include one or more wire-based electrical connections, portable computer discs, hard drives, random access memory (RAM), read only memory (ROM), erasable programmable read only memory (EPROM or flash memory), optical fiber, compact disk read only memory (CD-ROM), optical storage, magnetic storage, or any suitable combination of the foregoing.

The above description is only a preferred embodiment of the present disclosure and an illustration of the applied technical principles. Those skilled in the art should understand that the disclosure scope involved in this disclosure is not limited to the technical solution formed by the specific combination of the above-mentioned technical features, but also covers the technical solutions formed by the above-mentioned technical features or Other technical solutions formed by any combination of equivalent features. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this disclosure.

In addition, while operations are depicted in a particular order, this should not be understood as requiring that the operations be performed in the particular order shown or performed in sequential order. Under certain circumstances, multitasking and parallel processing may be advantageous. Likewise, while the above discussion contains several specific implementation details, these should not be construed as limitations on the scope of the disclosure. Certain features that are described in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable subcombination.

Although the subject matter has been described in language specific to structural features and/or methodological acts, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are merely example forms of implementing the claims.

Multiple embodiments of the present disclosure have been described in detail above, but the present disclosure is not limited to these specific embodiments. Those skilled in the art can make various variations and modifications on the basis of the concept of the disclosure. These variations and modifications All should fall within the scope of protection claimed by the present disclosure.

Claims (10)

1. The utility model provides a EGR system for engine, its characterized in that, includes energy recuperation exhaust pipe and EGR exhaust pipe, energy recuperation exhaust pipe's one end with the exhaust end of at least one first cylinder of engine is connected, EGR exhaust pipe's one end with the exhaust end of at least one second cylinder of engine is connected, energy recuperation exhaust pipe's the other end is connected with exhaust tail pipe through machine oil heating line and thermoelectric generation pipeline respectively set up thermoelectric generation system on the thermoelectric generation pipeline, EGR exhaust pipe's the other end with the air intake system of engine is connected.

2. The EGR system of claim 1 wherein a first valve is provided on the oil heating line and a second valve is provided on the thermoelectric generation line.

3. The EGR system according to claim 1, wherein a heat exchanger is provided on the oil heating line, the heat exchanger being configured to exchange heat with oil in an oil pan.

4. The EGR system of claim 1 wherein the thermoelectric generation system comprises an air reservoir connected to a power generation device.

5. The EGR system of claim 1, wherein a third valve is arranged on the EGR exhaust pipeline, the other end of the EGR exhaust pipeline is connected with one end of a pressure stabilizing cavity, and the other end of the pressure stabilizing cavity is respectively connected with the intake manifold corresponding to different cylinders in the engine through different EGR intake pipelines.

6. The EGR system of claim 5 wherein a fourth valve is provided on each of the EGR intake lines.

7. The EGR system of claim 4, wherein the power generation device is connected to a battery.

8. An engine characterized by employing an EGR system according to any of claims 1-7.

9. A vehicle comprising the engine of claim 8.

10. A control method of an EGR system that is the EGR system according to any one of claims 1 to 7, characterized by comprising:

when the temperature of the engine oil in the oil pan is smaller than a preset threshold value, the engine oil heating pipeline is opened and the thermoelectric generation pipeline is closed to heat the oil pan;

and when the temperature of the engine oil in the oil pan is greater than or equal to the preset threshold value, closing the engine oil heating pipeline and opening the thermoelectric generation pipeline, and generating electricity through the thermoelectric generation system.

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