Exhaust electric heating post-processing system

Abstract

The invention provides an exhaust electric heating aftertreatment system. The exhaust electric heating aftertreatment system comprises an aftertreatment module, an electric heater and a control module. The aftertreatment module is arranged on an exhaust pipeline of an external vehicle and comprises a diesel oxidation catalyst, a diesel particle filter and a selective catalytic reduction device. The electric heater is mounted on the gas inlet side of the post-treatment module through a gas exhaust pipeline, and the electric heater is suitable for heating waste gas flowing through the electric heater. The control module is suitable for collecting a state signal of the vehicle machine in an actual driving state, and the control module responds to the state signal to adjust the heating power range of the electric heater. Wherein the state signal comprises at least one of an accelerator signal of a vehicle machine, a rotating speed signal of an engine, a concentration signal of nitrogen oxide concentration in waste gas and a temperature signal of waste gas temperature.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of engine advanced aftertreatment technology and the field of transient emission control technology, in particular to an exhaust gas electric heating aftertreatment system. BACKGROUND

[0002] Diesel engines are widely used in heavy commercial vehicles, agricultural machinery, engineering machinery, ships and military, etc. due to their high compression ratio, high thermal efficiency and excellent fuel economy. With the increasing emphasis on environmental protection worldwide, emission regulations have become increasingly stringent, and higher requirements have been placed on diesel engine emission limits. Therefore, diesel exhaust treatment technology, especially the application of aftertreatment system (DOC+DPF+SCR), has become an important means to reduce harmful gas emissions from diesel engines.

[0003] During actual operation of the vehicle, especially during cold start, the working efficiency of the aftertreatment system is reduced due to the low exhaust gas temperature, and the harmful gas emissions exceed the regulatory limits. Currently, the industry mainly adopts the research route of optimizing the aftertreatment system to address the impact of exhaust gas temperature on the working efficiency of the aftertreatment system. Due to the high degree of integration of the original aftertreatment system, there is a complex coupling relationship between each component and system. This method is time-consuming and costly. In addition, the application of exhaust gas electric heating system in the field of heavy-duty diesel vehicles is less researched, and there is a lack of feasibility demonstration.

[0004] Therefore, how to optimize the working performance of the aftertreatment system under conditions that have a greater impact on exhaust gas temperature, such as cold start, while improving the economic efficiency and integration level of the heavy-duty diesel vehicle as a whole, has become a problem that needs to be solved urgently. SUMMARY

[0005] To solve at least one of the technical problems in the prior art, embodiments of the present disclosure provide an exhaust gas electric heating aftertreatment system, which adjusts the heating power of the exhaust gas electric heater in real time through a control module to meet the working requirements of the aftertreatment system in the high conversion efficiency zone.

[0006] Embodiments of the present disclosure provide an exhaust electric heater aftertreatment system, comprising: an aftertreatment module arranged on an exhaust pipe of an external vehicle, the aftertreatment module comprising a diesel oxidation catalyst, a diesel particulate filter and a selective catalytic reduction device; an exhaust electric heater installed on an intake side of the aftertreatment module through the exhaust pipe, the exhaust electric heater being adapted to heat exhaust gas flowing through the exhaust electric heater; and a control module adapted to collect state signals of the external vehicle in an actual driving state, the control module adjusting a heating power range of the exhaust electric heater in response to the state signals. The state signals include at least one of a throttle signal of a vehicle machine, a rotational speed signal of an engine, a concentration signal of nitrogen oxide concentration in the exhaust gas, and a temperature signal of the exhaust gas temperature.

[0007] According to some embodiments of the present disclosure, the control module comprises an electronic control unit and a power control unit, the electronic control unit and the power control unit being in communication connection; the power control unit is in electrical connection with the exhaust electric heater, and the power control unit is adapted to adjust an input voltage of the exhaust electric heater, thereby adjusting the heating power of the exhaust electric heater.

[0008] According to some embodiments of the present disclosure, the electronic control unit is configured to generate a voltage control curve based on the state signals and output a control signal to the power control unit, and the power control unit adjusts the voltage output to the exhaust electric heater in response to the control signal to adjust the heating power of the exhaust electric heater.

[0009] According to some embodiments of the present disclosure, the electronic control unit is in communication connection with an on-board ECU module of the external vehicle, and the throttle signal and the rotational speed signal are obtained through the on-board ECU module.

[0010] According to some embodiments of the present disclosure, the system further comprises a temperature sensor (72) and two nitrogen oxide sensors. The nitrogen oxide sensors are arranged in the exhaust pipe upstream and downstream of the aftertreatment module and are adapted to measure the concentration of nitrogen oxides in the exhaust gas; the temperature sensor is arranged in the exhaust pipe upstream of the selective catalytic reduction device and is adapted to measure the temperature of the exhaust gas. The electronic control unit is in communication connection with the nitrogen oxide sensors and the temperature sensor to obtain the concentration signal and the temperature signal.

[0011] According to some embodiments of the present disclosure, the system further comprises an inverter, the exhaust electric heater is powered by a power battery integrated in the electrical system of the external vehicle, and the inverter is adapted to convert direct current output by the power battery into alternating current for use by the electric heater.

[0012] According to some embodiments of the present disclosure, the power battery includes a 48-volt direct-current power battery, and the inverter is adapted to boost 48-volt direct-current power output by the 48-volt direct-current power battery to 380-volt alternating-current power. The power control unit is adapted to convert the 380-volt alternating-current power to adjustable voltage in the range of 220 volts to 450 volts.

[0013] According to some embodiments of the present disclosure, the exhaust electric heater includes a housing, a plurality of ceramic support sheets arranged in the housing in an axial direction of the housing, the ceramic support sheets being uniformly provided with a plurality of through holes, and a plurality of electric heating wires arranged in a compact spring configuration extending in the axial direction of the housing, the electric heating wires being fixed in the housing through the through holes.

[0014] According to some embodiments of the present disclosure, the exhaust electric heater is arranged close to an exhaust turbine exhaust pipe of an external vehicle, and exhaust gas flows through the exhaust electric heater through the exhaust turbine exhaust pipe. The housing of the exhaust electric heater is configured to have the same shape and size as the exhaust turbine exhaust pipe.

[0015] According to some embodiments of the present disclosure, the system further includes two pressure sensors arranged in the exhaust pipeline upstream and downstream of the diesel particulate filter, and adapted to measure the pressure in the exhaust pipeline upstream and downstream of the diesel particulate filter. The electronic control unit is in communication connection with the two pressure sensors to obtain the pressure signals.

[0016] According to the exhaust electric heating aftertreatment system provided by the present disclosure, the control module adjusts the heating power of the exhaust electric heater in real time according to the state signals of the external vehicle in the actual driving state, so as to meet the working requirements of the diesel oxidation catalyst, the diesel particulate filter and the selective catalytic reduction device in the high conversion efficiency region of the aftertreatment module. This method optimizes the working performance of the aftertreatment module under cold start and other conditions, not only improves the economic benefit and integration level of the aftertreatment system, but also helps to meet the increasingly stringent emission regulations and contributes to environmental protection. BRIEF DESCRIPTION OF DRAWINGS

[0017] The above and other objects, features and advantages of the present disclosure will become more apparent from the following description of embodiments of the present disclosure taken in conjunction with the accompanying drawings, in which:

[0018] Figure 1 is a system schematic diagram of an exhaust electric heating aftertreatment system according to an illustrative embodiment of the present disclosure;

[0019] Figure 2 is a structural schematic diagram of an aftertreatment module according to an illustrative embodiment of the present disclosure.

[0020] Figure 3 is a structural schematic diagram of a post-processing module according to another exemplary embodiment of the present disclosure;

[0021] Figure 4 is a structural schematic diagram of an exhaust electric heater according to an exemplary embodiment of the present disclosure.

[0022] In the drawings, the meanings of the reference signs are as follows:

[0023] 1. post-processing module;

[0024] 101. diesel oxidation catalyst;

[0025] 102. diesel particulate filter;

[0026] 103. selective catalytic reduction device;

[0027] 2. exhaust electric heater;

[0028] 201. housing;

[0029] 202. ceramic support sheet;

[0030] 203. through hole;

[0031] 204. electric heating wire;

[0032] 3. electronic control unit;

[0033] 4. power control unit;

[0034] 5. nitrogen oxygen sensor;

[0035] 6. temperature sensor;

[0036] 7. inverter;

[0037] 8. 48-volt direct current power battery;

[0038] 9. exhaust turbine exhaust pipe;

[0039] 10. pressure sensor; and

[0040] 11. engine exhaust pipe. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of the present disclosure clearer, the present disclosure is further described in detail below in combination with specific embodiments and with reference to the drawings.

[0042] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used herein, the terms "comprises", "comprising", "includes", "including" and the like are, generally, intended to be inclusive of the stated features, steps, operations and / or components, but not limiting of others.

[0043] All terms used herein including technical and scientific terms have the meanings commonly understood by one of ordinary skill in the art unless otherwise specified. It should be noted that the use of terms such as "first", "second" and the like can be used in this disclosure and do not imply a chronological or sequential order, but are merely used to distinguish one element from another.

[0044] In the case of using expressions similar to "at least one of A, B, and C", it should generally be interpreted to include any of them, more than one of them, or a combination thereof. In the case of using expressions similar to "at least one of A or B", it should generally be interpreted to include any of them, more than one of them, or a combination thereof.

[0045] It is also to be noted that the directional terms mentioned in the embodiments, such as "upper", "lower", "front", "rear", "left", "right", etc., are only the directions of the drawings for reference, and are not intended to limit the protection scope of the disclosure. Throughout the drawings, the same elements are represented by the same or similar reference numerals. When the conventional structures or configurations can cause confusion in understanding the disclosure, the conventional structures or configurations will be omitted.

[0046] Figure 1 is a system diagram of an exhaust electrically heated aftertreatment system according to an exemplary embodiment of the disclosure.

[0047] An exhaust electrically heated aftertreatment system according to embodiments of the disclosure is provided, as Figure 1As shown, the device comprises: a post-processing module 1 arranged on an exhaust pipe of an external vehicle, the post-processing module 1 comprising a diesel oxidation catalyst 101, a diesel particulate filter 102 and a selective catalytic reduction device 103; an exhaust electric heater 2 installed on the intake side of the post-processing module 1 through the exhaust pipe, the exhaust electric heater 2 being suitable for heating exhaust gas flowing through the exhaust electric heater 2; and a control module suitable for collecting state signals of the external vehicle in an actual driving state, the control module adjusting a heating power range of the exhaust electric heater 2 in response to the state signals; wherein the state signals comprise at least one of a throttle signal of a vehicle machine, a rotation speed signal of an engine, a concentration signal of nitrogen oxide concentration in exhaust gas and a temperature signal of exhaust gas temperature.

[0048] According to the above arrangement, by installing the exhaust electric heater 2 on the exhaust pipe of the intake side of the post-processing module 1 and dynamically adjusting the heating power by the control module according to the real-time state signals of the external vehicle, the problem of low processing efficiency of the post-processing module under the condition of low exhaust gas temperature such as cold start and low temperature of the vehicle is effectively improved, the concentration of emissions is reduced, and the more stringent environmental protection standards are met. According to real-time control, the time of the post-processing module 1 in the high emission low efficiency area due to too low temperature can be shortened, and the heating power of the exhaust electric heater 2 is adjusted according to the running state of the vehicle to further reduce the invalid heating time of the exhaust electric heater 2 when the post-processing module 1 is in the low emission area, thereby improving the economy of the heavy diesel vehicle in the actual running process and improving the emission performance of the post-processing module.

[0049] In detail, the diesel oxidation catalyst (DOC) 101 is used to reduce some harmful substances in engine emissions, especially hydrocarbons and carbon monoxide. The diesel oxidation catalyst 101 converts these harmful substances into harmless water vapor and carbon dioxide by oxidizing them. The diesel particulate filter (DPF) 102 is used to capture and filter particulate matter such as soot and ash in the exhaust gas.

[0050] In an illustrative embodiment, as shown in Figure 1 The control module comprises an electronic control unit 3 and a power control unit 4, which are communicatively connected; the power control unit 4 is electrically connected with the exhaust electric heater 2 and is suitable for adjusting the input voltage of the exhaust electric heater 2 to further adjust the heating power of the exhaust electric heater 2.

[0051] According to the above-described arrangement, the electronic control unit 3 and the power control unit 4 work in coordination through a communication connection to achieve precise control of the exhaust electric heater 2. The power control unit 4 can precisely control the heating power of the exhaust electric heater 2 by adjusting the input voltage of the exhaust electric heater 2, ensuring that the exhaust gas is heated to an appropriate temperature before entering the aftertreatment module 1 to facilitate the catalytic reaction.

[0052] In an illustrative embodiment, the electronic control unit 3 is configured to generate a voltage control curve based on the status signals and output a control signal to the power control unit 4, which adjusts the voltage output to the exhaust electric heater 2 in response to the control signal to adjust the heating power of the exhaust electric heater 2.

[0053] According to the above-described arrangement, the electronic control unit 3 generates a voltage control curve based on the collected status signals, such as the throttle signal (i.e., the position of the accelerator pedal), the speed signal (i.e., the speed of the engine), the concentration signal (i.e., the concentration of nitrogen oxides in the exhaust gas), and the temperature signal (i.e., the temperature of the exhaust gas), and sends a control signal to the power control unit 4. The power control unit 4 precisely adjusts the voltage output to the exhaust electric heater 2 according to the voltage control curve. In this way, the heating power of the exhaust electric heater 2 can be adjusted in real time to ensure that the exhaust gas reaches the optimal heating temperature before entering the aftertreatment module. A real-time, dynamic heating power adjustment mechanism is provided, which can adapt to the emission treatment needs of the external vehicle under different operating conditions.

[0054] In an illustrative embodiment, the electronic control unit 3 is in communication with the vehicle's on-board ECU module and obtains the throttle signal and speed signal through the on-board ECU module.

[0055] According to the above-described arrangement, the electronic control unit 3 is in communication with the vehicle's on-board ECU (Engine Control Unit) module. This connection allows the electronic control unit 3 to directly obtain key vehicle operating data, including the throttle signal and speed signal, from the on-board ECU module.

[0056] In detail, the throttle signal reflects the vehicle's real-time acceleration request, which is crucial for determining the engine load and the vehicle's operating mode. The speed signal provides information about the engine's rotational speed, which is an important parameter for evaluating engine performance and emission status. By obtaining the throttle signal and speed signal in real time, the electronic control unit 3 can more accurately determine the operating state of the external vehicle and generate a voltage control curve accordingly to adjust the heating power of the exhaust electric heater 2.

[0057] Figure 2 is a structural schematic diagram of an aftertreatment module according to an illustrative embodiment of the present disclosure.

[0058] In an exemplary embodiment, as shown in Figure 2 the exhaust aftertreatment system further comprises two nitrogen oxide sensors 5 arranged in the exhaust pipe upstream and downstream of the aftertreatment module 1, adapted to measure the concentration of nitrogen oxides in the exhaust gas; a temperature sensor 6 arranged in the exhaust pipe upstream of the selective catalytic reduction device 103, adapted to measure the temperature of the exhaust gas; wherein the electronic control unit 3 is in communication connection with the nitrogen oxide sensors 5 and the temperature sensor 6 to obtain the concentration signal of nitrogen oxides in the exhaust gas and the temperature signal of the exhaust gas.

[0059] According to the above arrangement, the nitrogen oxide sensor 5 upstream of the aftertreatment module 1 measures the concentration of nitrogen oxides in the untreated exhaust gas, while the downstream nitrogen oxide sensor 5 measures the residual concentration of nitrogen oxides in the exhaust gas after treatment by the aftertreatment module 1. The temperature sensor 6 is installed in the exhaust pipe upstream of the selective catalytic reduction device 103 to measure the temperature of the exhaust gas. The electronic control unit 3 is in communication connection with the nitrogen oxide sensors 5 and the temperature sensor 6 to obtain the concentration signal of nitrogen oxides in the exhaust gas and the temperature signal of the exhaust gas in real time. In this way, the system can adaptively adjust the heating power according to the actual emission concentration and exhaust gas temperature to optimize the performance of the aftertreatment system.

[0060] In detail, the selective catalytic reduction device 103 is very sensitive to operating temperature and usually works most effectively within a certain temperature range. The temperature sensor 6 is installed in the exhaust pipe upstream of the selective catalytic reduction device 103 to measure the temperature of the exhaust gas in real time. The electronic control unit 3 can accurately control the heating power of the exhaust electric heater 2 to ensure that the selective catalytic reduction device 103 operates at the optimal temperature.

[0061] Figure 3 is a structural schematic diagram of an aftertreatment module according to another exemplary embodiment of the present disclosure.

[0062] In an exemplary embodiment, as shown in Figure 3 the exhaust aftertreatment system further comprises a plurality of temperature sensors 6, at least one temperature sensor 6 arranged upstream and downstream of the diesel oxidation catalyst 101, the diesel particulate filter 102 and the selective catalytic reduction device 103.

[0063] In an exemplary embodiment, as shown in Figure 1 further comprises an inverter 7, the exhaust electric heater 2 is powered by a power battery integrated in the vehicle electrical system of the external vehicle, and the inverter 7 is adapted to convert the direct current output by the power battery into alternating current that can be used by the exhaust electric heater 2.

[0064] According to the above setting mode, the power battery in the whole vehicle electrical system of the external vehicle is selected as the power source of the exhaust electric heater 2, the volume and mass of the power supply device required by the heater are optimized, the modification of the vehicle is small, and the demand for lightweight and integration of future heavy commercial diesel vehicles is met. The direct current output by the power battery is converted into alternating current by the inverter 7, and the exhaust electric heater 2 can efficiently use electric energy for heating, thereby improving the energy utilization efficiency and environmental protection performance of the system.

[0065] In an illustrative embodiment, as shown in Figure 1 , the power battery includes a 48-volt direct-current power battery 8, and the inverter 7 is adapted to step up the 48V direct current output by the 48-volt direct-current power battery 8 to 380V alternating current. The power control unit 4 is adapted to convert the 380V alternating current into adjustable voltage in the range of 220V to 450V.

[0066] According to the above setting mode, the inverter 7 and the power control unit can convert the 48V direct current output by the 48-volt direct-current power battery 8 into alternating current with voltage in the range of 220V to 450V for use by the exhaust electric heater 2. The exhaust electric heater 2 can still meet the heating demand of the system in a smaller size, while reducing the flow resistance and exhaust back pressure. Further, the 380V alternating current can be used by other on-board devices, meeting the demand for integrated design of heavy diesel commercial vehicles and improving the compatibility and energy efficiency of the system.

[0067] Figure 4 is a schematic diagram of the internal structure of an exhaust electric heater according to an illustrative embodiment of the present disclosure.

[0068] In an illustrative embodiment, as shown in Figure 4 , the exhaust electric heater 2 includes a housing 201, a plurality of ceramic support sheets 202 arranged in the housing 201 along the axial direction of the housing 201, and a plurality of electric heating wires 204 arranged in a close spring configuration extending along the axial direction of the housing 201.

[0069] According to the above setting mode, the design of the exhaust electric heater 2 fixes the electric heating wires 204 in the through holes 203 of the ceramic support sheets 202 in a close spring configuration extending along the axial direction, which increases the effective contact area with the exhaust gas, optimizes the distribution of the exhaust gas, improves the heat exchange efficiency, reduces the flow resistance and exhaust back pressure, has the advantages of small size, light weight and wide power applicability, and these characteristics make it an ideal choice for improving the exhaust treatment efficiency and meeting the environmental protection standards.

[0070] In an illustrative embodiment, as shown in Figure 4As shown, the intake side of the exhaust electric heater 2 is arranged close to the exhaust turbine exhaust pipe 9 of the external vehicle, through which the exhaust gas flows through the exhaust electric heater 2; wherein the shell 201 of the exhaust electric heater 2 is configured to have the same shape and size as the exhaust turbine exhaust pipe 9.

[0071] According to the above arrangement, the shape and size of the exhaust electric heater 2 shell 201 are consistent with the exhaust turbine exhaust pipe 9. This design allows the exhaust electric heater 2 to be installed by simply replacing part of the exhaust pipe of the exhaust turbine exhaust pipe 9, reducing the modification of the original engine exhaust system of the vehicle caused by the introduction of the exhaust electric heater 2, and facilitating the installation and removal of the exhaust electric heater 2, meeting the needs of regular maintenance and inspection.

[0072] In an illustrative embodiment, as shown in Figure 3 The exhaust electric heating aftertreatment system further comprises two pressure sensors 10 arranged in the exhaust pipe upstream and downstream of the diesel particulate filter 102, suitable for measuring the pressure in the exhaust pipe upstream and downstream of the diesel particulate filter 102; wherein the electronic control unit 3 is in communication with the two pressure sensors 10 to obtain pressure signals.

[0073] According to the above arrangement, the electronic control unit 3 is in communication with the two pressure sensors 10 to obtain real-time pressure signals upstream and downstream of the diesel particulate filter 102. The pressure difference of the diesel particulate filter 102 can indicate the accumulation of particulate matter. By analyzing these pressure signals, the electronic control unit 3 can more accurately control the heating power of the exhaust electric heater 2 to ensure that the diesel particulate filter 102 works in the best state.

[0074] In an illustrative embodiment, as shown in Figure 3 A pressure sensor 10 is arranged in the exhaust pipe upstream and downstream of the aftertreatment module 1, suitable for measuring the pressure in the exhaust pipe upstream and downstream of the aftertreatment module 1.

[0075] According to the above arrangement, the pressure upstream and downstream is measured by two pressure sensors 10, which can understand the influence of the aftertreatment module 1 on the exhaust gas flow. For example, if the aftertreatment module 1 is blocked, the pressure difference between the upstream and downstream will increase. The electronic control unit 3 is in communication with the pressure sensor 10 to obtain real-time pressure signals. These signals help the electronic control unit 3 to evaluate the operating condition of the aftertreatment module 1 and adjust the heating power of the exhaust electric heater 2 accordingly to optimize the system performance.

[0076] Those skilled in the art can understand that the features recited in various embodiments and / or claims of the present disclosure can be combined or / and integrated in various combinations, even if such combinations are not explicitly recited in the present disclosure. In particular, the features recited in various embodiments and / or claims of the present disclosure can be combined and / or integrated in various combinations without departing from the spirit and teachings of the present disclosure. All such combinations and / or integrations fall within the scope of the present disclosure.

[0077] The above describes embodiments of the present disclosure. However, these embodiments are merely for illustrative purposes, and are not intended to limit the scope of the present disclosure. Although each embodiment is described above separately, this does not mean that the measures in each embodiment cannot be used advantageously in combination. The scope of the present disclosure is defined by the appended claims and their equivalents. Without departing from the scope of the present disclosure, those skilled in the art can make various substitutions and modifications, which all fall within the scope of the present disclosure.

Claims

1. An exhaust electrically heated aftertreatment system, characterized in that, The exhaust gas electric heater (2) is installed on the intake side of the aftertreatment module (1) through the exhaust pipe, and is suitable for heating the exhaust gas flowing through the exhaust gas electric heater (2). The control module is suitable for collecting state signals of the external vehicle in the actual driving state, and the control module adjusts the heating power range of the exhaust gas electric heater (2) in response to the state signals. The state signals include at least one of the throttle signal of the vehicle machine, the speed signal of the engine, the concentration signal of the nitrogen oxide concentration in the exhaust gas, and the temperature signal of the exhaust gas temperature. The control module includes an electronic control unit (3) and a power control unit (4), and the electronic control unit (3) and the power control unit (4) are communicatively connected. The power control unit (4) is electrically connected with the exhaust gas electric heater (2) and is suitable for adjusting the input voltage of the exhaust gas electric heater (2) and adjusting the heating power of the exhaust gas electric heater (2).

2. The system of claim 1, wherein, The electronic control unit (3) is configured to generate a voltage control curve based on the state signals and output a control signal to the power control unit (3), and the power control unit (4) adjusts the voltage output to the exhaust gas electric heater (2) in response to the control signal to adjust the heating power of the exhaust gas electric heater (2). The electronic control unit (3) is communicatively connected with the vehicle-mounted ECU module of the external vehicle, and obtains the throttle signal and the speed signal through the vehicle-mounted ECU module.

3. The system of claim 2, wherein, Further comprising:

4. The system of claim 3, wherein, Two nitrogen oxide sensors (5) are arranged in the exhaust pipe upstream and downstream of the aftertreatment module (1) and are suitable for measuring the concentration of nitrogen oxides in the exhaust gas.

5. The system of claim 3, wherein, A temperature sensor (6) is arranged in the exhaust pipe upstream of the selective catalytic reduction device (103) and is suitable for measuring the temperature of the exhaust gas. The electronic control unit (3) is communicatively connected with the nitrogen oxide sensor (5) and the temperature sensor (6) to obtain the concentration signal and the temperature signal. Further comprising an inverter (7), the exhaust gas electric heater (2) is powered by a power battery integrated in the vehicle electrical system of the external vehicle, and the inverter (7) is suitable for converting the direct current output by the power battery into alternating current that can be used by the exhaust gas electric heater (2). The power battery includes a 48-volt direct current power battery (8), and the inverter (7) is suitable for boosting the 48V direct current output by the 48-volt direct current power battery (8) to 380V alternating current.

6. The system of claim 3, wherein, The power control unit (4) is suitable for converting the 380V alternating current into adjustable voltage in the range of 220V to 450V.

7. The system of claim 6, wherein, The exhaust gas electric heater (2) comprises: A shell (201); 8. The system of claim 1, wherein, ​ ​ A plurality of ceramic support sheets (202) are arranged in the housing (201) in an axial direction, and a plurality of through holes (203) are uniformly arranged on the ceramic support sheets (202); A plurality of electric heating wires (204) are arranged in a compact spring configuration extending in the axial direction of the housing (201), and the electric heating wires (204) are fixed in the housing (201) through the through holes (203).

9. The system of claim 8, wherein, The intake side of the exhaust electric heater (2) is arranged close to the exhaust turbine exhaust pipe (9) of an external vehicle, and exhaust gas flows through the exhaust electric heater (2) through the exhaust turbine exhaust pipe (9); The housing (201) of the exhaust electric heater (2) is configured to have the same shape and size as the exhaust turbine exhaust pipe (9).

10. The system of claim 3, wherein, Further comprising: Two pressure sensors (10) are arranged in the exhaust pipeline upstream and downstream of the diesel particulate filter (102) and are suitable for measuring the pressure in the exhaust pipeline upstream and downstream of the diesel particulate filter (102); The electronic control unit (3) is in communication connection with the two pressure sensors (10) to obtain pressure signals.

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