Thermal management system and method for automobile exhaust gas recirculation and automobile

Abstract

The invention provides a thermal management system and method for automobile exhaust gas recirculation and an automobile, the thermal management system comprises a heat exchanger, a first pipeline, a second pipeline and a regulating pipeline group, the heat exchanger is provided with a first port and a second port, the first pipeline is provided with a first multi-way valve, the first port is communicated with a first interface of the first multi-way valve, the second pipeline is provided with a second multi-way valve, and the regulating pipeline group is communicated with a second interface of the second multi-way valve. The second port is communicated with the first interface of the second multi-way valve, and the adjusting pipeline group is respectively communicated with the first multi-way valve and the second multi-way valve; according to the technical scheme, the heat exchanger at least has the beneficial effects that by arranging the adjusting pipeline set, the liquid inlet direction of the heat exchanger can be adjusted, so that the heat exchange efficiency is adjusted, the liquid inlet direction in the heat exchanger is adjusted to be reverse under the condition that the temperature is extremely low, the heat exchange efficiency is improved, and the heat exchange efficiency is improved. The heat exchange efficiency of the heat exchanger is reduced, the waste gas condensation temperature is further reduced, and the use temperature range of the waste gas recirculation system is enlarged.

Description

Technical Field

[0001] This invention relates to the field of automotive thermal management technology, specifically to a thermal management system, method, and vehicle for automotive exhaust gas recirculation. Background Technology

[0002] Existing plug-in hybrid electric vehicles (PHEVs) and range-extended electric vehicles (REEVs) are equipped with hybrid-specific engines and generally employ low-pressure EGR (Exhaust Gas Recirculation) to improve fuel efficiency and reduce pollutant emissions. EGR involves introducing a portion of the exhaust gas from the engine into the intake manifold, where it is mixed with fresh air and re-enters the cylinders for combustion. Because the exhaust gas contains a large amount of polyatomic gases such as CO2, which are not combustible but absorb a significant amount of heat due to their high specific heat capacity, the maximum combustion temperature of the air-fuel mixture in the cylinder is lowered, thereby reducing NOx formation.

[0003] Existing exhaust gas recirculation (EGR) systems are basically only suitable for environments with temperatures above zero. Under extreme low temperatures, the cooling medium inside the intercooler may freeze, causing damage to the intercooler. Therefore, the EGR system needs to be turned off, but this will lead to increased vehicle fuel consumption. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a thermal management system, method and vehicle for exhaust gas recirculation, to solve the problem in the prior art where, under extreme low temperature conditions, the cooling medium inside the intercooler may freeze or become icy, causing damage to the intercooler, so the EGR system needs to be shut down, but this leads to increased fuel consumption.

[0005] To achieve the above and other related objectives, the present invention provides a thermal management system for automotive exhaust gas recirculation, comprising: A heat exchanger having a first port and a second port; A first pipeline, the first pipeline having a first multi-way valve, the first port being connected to the first interface of the first multi-way valve; The second pipeline has a second multi-way valve, and the second port is connected to the first interface of the second multi-way valve. The regulating pipeline assembly is connected to the first multi-way valve and the second multi-way valve respectively, and is also connected to the first port and the second port respectively. The regulating pipeline assembly is used to regulate the inlet and outlet directions of the first and second ports.

[0006] Optionally, the thermal management system further includes a water pump and a radiator; The outlet of the water pump is connected to the second port of the first multi-way valve, the inlet of the water pump is connected to the outlet of the radiator, and the inlet of the radiator is connected to the second port of the second multi-way valve.

[0007] Optionally, the regulating pipeline group includes a first regulating pipeline and a second regulating pipeline. The first regulating pipeline is connected to the third interface of the first multi-way valve and the third interface of the second multi-way valve, respectively. The second regulating pipeline is connected to the first pipeline and the second pipeline, respectively. The connection between the second regulating pipeline and the first pipeline is located between the first multi-way valve and the heat exchanger, and the connection between the second regulating pipeline and the second pipeline is located between the second multi-way valve and the water pump.

[0008] Optionally, the regulating pipeline group includes a first regulating pipeline and a second regulating pipeline. One end of the first regulating pipeline is connected to the third interface of the first multi-way valve, and the other end of the first regulating pipeline is connected to the second port of the heat exchanger. One end of the second regulating pipeline is connected to the third interface of the second multi-way valve, and the other end of the second regulating pipeline is connected to the first port of the heat exchanger.

[0009] Optionally, both the first and second ports of the heat exchanger are equipped with detection devices for detecting the direction of liquid flow.

[0010] The present invention also provides a thermal management method for automobile exhaust gas recirculation, the thermal management method being used to control the above-mentioned thermal management system, the thermal management method comprising: Acquire environmental information, which includes at least ambient temperature information; The ambient temperature information is compared with the preset adjustment temperature information. If the ambient temperature information is greater than or equal to the preset adjustment temperature information, the liquid in the heat exchanger is controlled to enter through the first port and exit through the second port. If the ambient temperature information is less than the preset adjustment temperature information, the liquid in the heat exchanger is controlled to enter through the second port and exit through the first port.

[0011] Optionally, the control of the liquid entering the heat exchanger from the second port and exiting from the first port further includes: The ambient temperature information is compared with the preset stop temperature information. If the ambient temperature information is greater than or equal to the preset stop temperature information, the liquid in the heat exchanger is controlled to enter through the second port and exit through the first port. If the ambient temperature information is less than the preset stop temperature information, the exhaust gas recirculation system is shut down.

[0012] Optionally, the control of the liquid entering the heat exchanger from the second port and exiting from the first port further includes: Control the first pipeline or the regulating pipeline group to reduce the liquid inlet flow to the heat exchanger, thereby reducing the heat exchange efficiency of the heat exchanger.

[0013] Optionally, the thermal management method further includes: The liquid flow direction at the first and second ports of the heat exchanger is detected. If the first and second ports do not conform to the preset liquid flow direction, an alarm is issued.

[0014] The present invention also provides an automobile, including the above-described automobile exhaust gas recirculation thermal management system.

[0015] As described above, the beneficial effects of the technical solution in this invention include at least the following: by setting up a regulating pipeline group, the liquid inlet direction of the heat exchanger can be adjusted, thereby adjusting the heat exchange efficiency. When the temperature is extremely low, by adjusting the liquid inlet direction in the heat exchanger to the reverse direction, the heat exchange efficiency of the heat exchanger is reduced, and the temperature of the exhaust gas condensation is further reduced, thereby increasing the operating temperature range of the exhaust gas recirculation system. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0017] In the attached diagram: Figure 1 The diagram shown is a structural schematic of a first thermal management system according to an exemplary embodiment of the present invention. Figure 2 The diagram shown is a structural schematic of a second thermal management system according to an exemplary embodiment of the present invention. Figure 3 The diagram shown is a flowchart illustrating a thermal management method as an exemplary embodiment of the present invention.

[0018] The attached figures are labeled as follows: 1. Heat exchanger; 2. First pipeline; 3. Second pipeline; 4. First multi-way valve; 5. Second multi-way valve; 6. Water pump; 7. Radiator; 8. First regulating pipeline; 9. Second regulating pipeline. Detailed Implementation

[0019] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0020] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0021] Numerous details are explored in the following description to provide a more thorough explanation of embodiments of the present disclosure. However, it will be apparent to those skilled in the art that embodiments of the present disclosure may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present disclosure.

[0022] Please see Figure 1This invention provides a thermal management system for automotive exhaust gas recirculation, comprising: a heat exchanger 1, a first pipeline 2, a second pipeline 3, and a regulating pipeline group. The heat exchanger 1 has a first port and a second port, which are connected. In this embodiment, both the first port and the second port can serve as either an inlet or an outlet. The first pipeline 2 and the second pipeline 3 are respectively connected to the first port and the second port of the heat exchanger 1. The first pipeline 2 has a first multi-way valve 4, and the first port is connected to a first interface of the first multi-way valve 4. The second pipeline 3 has a second multi-way valve 5, and each interface of the first multi-way valve 4 and the second multi-way valve 5 is equipped with a valve to control the opening and closing of the interface. The second port is connected to the first interface of the second multi-way valve 5. The regulating pipeline group is respectively connected to the first multi-way valve 4 and the second multi-way valve 5, and the regulating pipeline group is respectively connected to the first port and the second multi-way valve 5. The ports are connected; wherein, the regulating pipeline group is used to regulate the inlet and outlet directions of the first port and the second port. The regulating pipeline group has multiple valves, which control the switching of the liquid inlet (first port or second port) and liquid outlet (first port or second port) of the heat exchanger 1 by opening and closing the valves. When the ambient temperature is high, the coolant in the heat exchanger 1 flows in the forward direction (the liquid flow direction is opposite to the flow direction of the gas to be heat exchanged; in this embodiment, it means controlling the liquid in the heat exchanger to enter from the first port and exit from the second port), and the heat exchange efficiency is high. When the ambient temperature is low, in order to ensure the normal operation of the exhaust gas recirculation system, the coolant in the heat exchanger 1 flows in the reverse direction (the liquid flow direction is the same as the flow direction of the gas to be heat exchanged; in this embodiment, it means controlling the liquid in the heat exchanger to enter from the second port and exit from the first port), and the heat exchange efficiency is reduced, thereby avoiding the condensation of moisture in the exhaust gas and improving the operating temperature range of the exhaust gas recirculation system.

[0023] Specifically, in an optional embodiment of this application, the thermal management system further includes a water pump 6 and a radiator 7. The outlet of the water pump 6 is connected to the second interface of the first multi-way valve 4, and the inlet of the water pump 6 is connected to the second interface of the second multi-way valve 5. The radiator 7 is located between the water pump 6 and the second multi-way valve 5. The coolant of the water pump 6 is output through the first pipeline 2, passes through the heat exchanger 1, enters the second pipeline 3, and finally returns to the water pump 6 after being cooled by the radiator 7.

[0024] Please see Figure 1Specifically, in an optional embodiment of this application, the regulating pipeline group includes a first regulating pipeline 8 and a second regulating pipeline 9. Both the first regulating pipeline 8 and the second regulating pipeline 9 are equipped with valves. The first regulating pipeline 8 is connected to the third port of the first multi-way valve 4 and the third port of the second multi-way valve 5, respectively. The second regulating pipeline 9 is connected to the first pipeline 2 and the second pipeline 3, respectively. The connection point between the second regulating pipeline 9 and the first pipeline 2 is located between the first multi-way valve 4 and the heat exchanger 1, and the connection point between the second regulating pipeline 9 and the second pipeline 3 is... Located between the second multi-way valve 5 and the water pump 6, when the ambient temperature is high, the coolant in the heat exchanger 1 flows forward, and the coolant in the water pump 6 enters the first pipeline 2, then enters the heat exchanger 1 through the first port of the first multi-way valve 4, enters the second pipeline 3 through the first port of the second multi-way valve 5, and finally returns to the water pump 6, completing the heat exchange. At this time, the first and second ports of the first multi-way valve 4 are open, and the third port of the first multi-way valve 4 is closed. The first and second ports of the second multi-way valve 5 are open, and the third port of the second multi-way valve 5 is closed. The first regulating pipeline... Both valves in pipe 8 and the second regulating pipe 9 are closed. When the ambient temperature is low and the coolant in heat exchanger 1 flows in reverse, the coolant in pump 6 enters the front section of the first pipe 2 (the pipe between pump 6 and the first multi-way valve 4), then enters the first regulating pipe 8 through the third port of the first multi-way valve 4, and then enters the rear section of the second pipe 3 (the pipe between the second multi-way valve 5 and heat exchanger 1) through the third port of the second multi-way valve 5, entering heat exchanger 1, and then entering the second regulating pipe 9 from the rear section of the first pipe 2 (the pipe between the first multi-way valve 4 and heat exchanger 1). Finally, the coolant returns to the water pump 6 via the front section of the second pipeline 3 (the pipeline between the second multi-way valve 5 and the water pump 6). At this time, the second and third ports of the first multi-way valve 4 are open, and the first port of the first multi-way valve 4 is closed. At this time, the first and third ports of the second multi-way valve 5 are open, and the second port of the second multi-way valve 5 is closed. The valves of the first regulating pipeline 8 and the second regulating pipeline 9 are both open. This achieves control over the forward and reverse flow of the coolant in the heat exchanger 1, thereby controlling the heat exchange efficiency of the heat exchanger 1 and thus improving the operating temperature range of the exhaust gas recirculation system.

[0025] Please see Figure 2Specifically, in an optional embodiment of this application, the regulating pipeline group includes a first regulating pipeline 8 and a second regulating pipeline 9. One end of the first regulating pipeline 8 is connected to the third interface of the first multi-way valve 4, and the other end of the first regulating pipeline 8 is connected to the second port of the heat exchanger 1. The second regulating pipeline 9 is connected to the third interface of the second multi-way valve 5, and the other end of the second regulating pipeline 9 is connected to the first port of the heat exchanger 1. When the ambient temperature is high, the coolant in the heat exchanger 1 flows forward. The coolant in the water pump 6 enters the first pipeline 2, then enters the heat exchanger 1 through the first interface of the first multi-way valve 4, enters the second pipeline 3 through the first interface of the second multi-way valve 5, and finally returns to the water pump 6, completing the heat exchange. At this time, the first interface and the second interface of the first multi-way valve 4 are... In the open state, the third port of the first multi-way valve 4 is closed, the first and second ports of the second multi-way valve 5 are open, and the third port of the second multi-way valve 5 is closed. When the ambient temperature is low and the coolant in the heat exchanger 1 flows in reverse, the coolant in the water pump 6 enters the first pipe 2, then enters the heat exchanger 1 through the third port of the first multi-way valve 4, and after being discharged from the heat exchanger 1, enters the second regulating pipe 9, and then enters the second pipe 3 through the third port of the second multi-way valve 5 to return to the water pump 6, completing the heat exchange. At this time, the second and third ports of the first multi-way valve 4 are open, the first port of the first multi-way valve 4 is closed, the second and third ports of the second multi-way valve 5 are open, and the first port of the second multi-way valve 5 is closed.

[0026] Specifically, in an optional embodiment of this application, a detection device for detecting the direction of liquid flow is provided on both the first port and the second port of the heat exchanger 1. The detection device is used to detect whether the direction of liquid flow at the first port and the second port is correct. If it is different from the required flow direction, an alarm is triggered.

[0027] Please see Figure 3 This application also provides a thermal management method for automotive exhaust gas recirculation, the thermal management method being used to control the aforementioned thermal management system, the thermal management method comprising: Step 110: Obtain environmental information, which includes at least ambient temperature information; Step 120: Compare the ambient temperature information with the preset temperature adjustment information; Step 130: If the ambient temperature information is greater than or equal to the preset adjustment temperature information, control the liquid in the heat exchanger 1 to flow in the forward direction; Step 140: If the ambient temperature information is less than the preset adjustment temperature information, control the liquid in the heat exchanger 1 to flow in reverse.

[0028] Specifically, in one optional embodiment of this application, an ambient temperature sensor or infrared thermometer detects external temperature information (ambient temperature information) and uploads the detected ambient temperature information to the vehicle system. The vehicle system compares the ambient temperature information with preset adjustment temperature information, which is the threshold for determining whether the coolant in the heat exchanger 1 flows forward or backward. Adjusting the forward or backward flow of the coolant in the heat exchanger 1 is achieved through the first adjustment pipe 8 and the second adjustment pipe 9. When the ambient temperature information is greater than or equal to the preset adjustment temperature information, it is determined that the ambient temperature is high, and the exhaust gas recirculation system can operate normally. The liquid in the heat exchanger is controlled to enter from the first port and exit from the second port. When the ambient temperature information is less than the preset adjustment temperature information, it is determined that the ambient temperature is low, and the moisture in the exhaust gas is prone to condensation, causing blockage of pipes or valves. The adjustment pipe group is controlled to reverse the flow of coolant in the heat exchanger 1, and the liquid in the heat exchanger is controlled to enter from the second port and exit from the first port, reducing the heat exchange efficiency of the heat exchanger 1. This improves the operating temperature range of the exhaust gas recirculation system, lowers the minimum operating temperature, and achieves energy saving.

[0029] Specifically, in an optional embodiment of this application, controlling the liquid in the heat exchanger 1 to enter through the second port and exit through the first port further includes: When the coolant in heat exchanger 1 flows in reverse, if the preset stop temperature is lower than the preset adjustment temperature, which is the temperature at which the coolant in heat exchanger 1 cannot operate even if it flows in reverse, the ambient temperature is compared with the preset stop temperature. If the ambient temperature is higher than the preset stop temperature, the liquid in heat exchanger 1 is controlled to flow in reverse. If the ambient temperature is lower than the preset stop temperature, the exhaust gas recirculation system is shut down. When the ambient temperature reaches the minimum temperature value required for the exhaust gas recirculation system to open, the exhaust gas recirculation system is determined to be shut down to prevent moisture in the exhaust gas from condensing.

[0030] Specifically, in an optional embodiment of this application, controlling the liquid in the heat exchanger 1 to enter through the second port and exit through the first port further includes: By controlling the first pipeline 2 or the regulating pipeline group to reduce the liquid inlet flow of the heat exchanger 1, the heat carried away during heat exchange with the waste gas is reduced, which can further increase the temperature range at which the waste gas recirculation system can be activated.

[0031] Specifically, in an optional embodiment of this application, the thermal management method further includes: The liquid flow direction at the first and second ports of heat exchanger 1 is detected. If the first and second ports do not conform to the preset liquid flow direction, an alarm is issued.

[0032] This application also provides a vehicle including the aforementioned vehicle exhaust gas recirculation thermal management system.

[0033] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A thermal management system for automotive exhaust gas recirculation, characterized in that, include: A heat exchanger having a first port and a second port in communication; A first pipeline, the first pipeline having a first multi-way valve, the first port being connected to the first interface of the first multi-way valve; The second pipeline has a second multi-way valve, and the second port is connected to the first interface of the second multi-way valve. The regulating pipeline assembly is connected to the first multi-way valve and the second multi-way valve respectively, and is also connected to the first port and the second port respectively. The regulating pipeline assembly is used to regulate the inlet and outlet directions of the first and second ports.

2. The automotive exhaust gas recirculation thermal management system according to claim 1, characterized in that, The thermal management system also includes water pumps and radiators; The outlet of the water pump is connected to the second port of the first multi-way valve, the inlet of the water pump is connected to the outlet of the radiator, and the inlet of the radiator is connected to the second port of the second multi-way valve.

3. The automotive exhaust gas recirculation thermal management system according to claim 2, characterized in that: The regulating pipeline group includes a first regulating pipeline and a second regulating pipeline. The first regulating pipeline is connected to the third interface of the first multi-way valve and the third interface of the second multi-way valve, respectively. The second regulating pipeline is connected to the first pipeline and the second pipeline, respectively. The connection point between the second regulating pipeline and the first pipeline is located between the first multi-way valve and the heat exchanger, and the connection point between the second regulating pipeline and the second pipeline is located between the second multi-way valve and the water pump.

4. The automotive exhaust gas recirculation thermal management system according to claim 2, characterized in that: The regulating pipeline group includes a first regulating pipeline and a second regulating pipeline. One end of the first regulating pipeline is connected to the third interface of the first multi-way valve, and the other end of the first regulating pipeline is connected to the second port of the heat exchanger. One end of the second regulating pipeline is connected to the third interface of the second multi-way valve, and the other end of the second regulating pipeline is connected to the first port of the heat exchanger.

5. The automotive exhaust gas recirculation thermal management system according to claim 1, characterized in that: Both the first and second ports of the heat exchanger are equipped with detection devices for detecting the direction of liquid flow.

6. A thermal management method for automobile exhaust gas recirculation, characterized in that, The thermal management method is used to control the thermal management system according to any one of claims 1-5, the thermal management method comprising: Acquire environmental information, which includes at least ambient temperature information; The ambient temperature information is compared with the preset adjustment temperature information. If the ambient temperature information is greater than or equal to the preset adjustment temperature information, the liquid in the heat exchanger is controlled to enter through the first port and exit through the second port. If the ambient temperature information is less than the preset adjustment temperature information, the liquid in the heat exchanger is controlled to enter through the second port and exit through the first port.

7. The thermal management method for automobile exhaust gas recirculation according to claim 6, characterized in that, The control of liquid entering through the second port and exiting through the first port in the heat exchanger also includes: The ambient temperature information is compared with the preset stop temperature information. If the ambient temperature information is greater than or equal to the preset stop temperature information, the liquid in the heat exchanger is controlled to enter through the second port and exit through the first port. If the ambient temperature information is less than the preset stop temperature information, the exhaust gas recirculation system is shut down.

8. The thermal management method for automobile exhaust gas recirculation according to claim 6, characterized in that, The control of liquid entering through the second port and exiting through the first port in the heat exchanger also includes: Control the first pipeline or the regulating pipeline group to reduce the liquid inlet flow to the heat exchanger, thereby reducing the heat exchange efficiency of the heat exchanger.

9. The thermal management method for automobile exhaust gas recirculation according to claim 6, characterized in that, The thermal management method further includes: The liquid flow direction at the first and second ports of the heat exchanger is detected. If the first and second ports do not conform to the preset liquid flow direction, an alarm is issued.

10. A car, characterized in that, The thermal management system for automobile exhaust gas recirculation as described in any one of claims 1-5.

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