A synergistic activation method and system of electrically heated catalytic converter coupled with plasma

Abstract

The application provides a kind of electric heating catalytic converter and plasma coupling synergistic activation method and system, method includes: arranging exhaust pipe temperature sensor T1 and EHC shell wall sensor T2;Judge T1 and T2 whether satisfy first preset condition, is then EHC is started by first energy adjusting mode;Judge T2 whether satisfy second preset condition, is then discharge by NTP with first rated parameter to reach first rated temperature;Judge T1 and T2 whether satisfy third preset condition, is then start by second energy adjusting mode, discharge by NTP with second rated parameter to T1 and T2 reach second rated temperature;EHC is started by third energy adjusting mode, discharge by NTP with third rated parameter, when T2 reaches third rated temperature, reduce EHC power and adjust NTP discharge frequency to T1 and T2 reach fourth rated temperature.The application can improve the low-temperature conversion efficiency of unburned HC, CO and NOx.

Description

Technical Field

[0001] This invention relates to the field of internal combustion engine aftertreatment technology, and in particular to a synergistic activation method and system of an electrically heated catalyst coupled with plasma. Background Technology

[0002] In the field of internal combustion engine aftertreatment technology, electrically heated catalytic converters (EHC), as an active preheating technology, can effectively solve the problem of extremely low catalytic efficiency of traditional three-way catalytic converters (TWC) during engine cold starts due to excessively low temperatures, thereby reducing the emission of harmful pollutants during this stage. However, conventional EHC technology often applies high-power heating at the initial stage of startup to quickly raise the carrier temperature. This drastic temperature rise process can easily cause thermal shock to the resistance wire and ceramic carrier inside the catalytic converter, affecting its long-term reliability and resulting in high energy consumption. Meanwhile, low-temperature plasma (NTP) technology, which can generate highly active particles through discharge at room temperature and pressure, has been studied for auxiliary exhaust gas purification and low-temperature activation of catalytic converters. However, applying NTP technology alone to treat the large flow and low temperature exhaust gas during engine cold starts often presents challenges such as low energy utilization and limited activation effect.

[0003] In existing technologies, the simple combination of EHC and NTP often fails to adequately consider their synergistic matching and sequential control under extreme cold-start conditions. For example, direct start-up in extremely low-temperature environments may damage the EHC due to excessive temperature differences, or result in inefficient NTP discharge due to temperature mismatch. There is a lack of a synergistic control method that intelligently adjusts the EHC zone heating strategy and NTP discharge parameters based on real-time temperature conditions to achieve a smooth, efficient, and reliable catalyst activation process, thereby protecting the device's lifespan while optimizing energy consumption and purification performance. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a synergistic activation method for an electrically heated catalyst coupled with plasma, thereby resolving the technical problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0006] A synergistic activation method for an electrically heated catalyst coupled with plasma includes the following steps:

[0007] Install exhaust pipe temperature sensors and EHC housing wall-mounted sensors;

[0008] When the engine starts, it is determined whether the data collected by the exhaust pipe temperature sensor and the EHC housing wall sensor meet the first preset condition. If so, the multi-segment controllable resistance wire inside the EHC is started through the first energy adjustment method so that the temperature rise gradient is less than the rated temperature rise gradient.

[0009] Determine whether the data collected by the EHC housing wall-attached sensor meets the second preset condition. If so, discharge the sensor using the NTP power supply with the first rated parameters until the data collected by the EHC housing wall-attached sensor reaches the first rated temperature.

[0010] Determine whether the data collected by the exhaust pipe temperature sensor and the EHC housing wall-attach sensor meet the third preset condition. If so, the multi-segment controllable resistance wire inside the EHC is started through the second energy adjustment method, and at the same time, it is discharged through the NTP power supply with the second rated parameters until the data collected by the exhaust pipe temperature sensor and the EHC housing wall-attach sensor reach the second rated temperature.

[0011] The multi-segment controllable resistance wire inside the EHC is started through the third energy adjustment method, and at the same time, it is discharged through the NTP power supply with the third rated parameters. When the data collected by the EHC housing wall-mounted sensor reaches the third rated temperature, the EHC power is reduced and the NTP discharge frequency is adjusted until the data collected by the exhaust pipe temperature sensor and the EHC housing wall-mounted sensor reach the fourth rated temperature.

[0012] According to one aspect of the above technical solution, the first preset condition is: the temperature collected by the exhaust pipe temperature sensor is less than or equal to 0°C, and the difference between the temperature collected by the exhaust pipe temperature sensor and the temperature collected by the EHC housing wall-mounted sensor is less than 2°C.

[0013] According to one aspect of the above technical solution, the EHC is provided with a first partition, a second partition, and a third partition in sequence from the inlet side to the outlet side.

[0014] According to one aspect of the above technical solution, the first energy regulation method is as follows: the first zone is powered on at 10%~15% of the rated power for 3s~5s, the second zone is kept in a de-energized state, and the third zone is intermittently pulsed heated at 5%~8% of the rated power, and the rated heating gradient is 2℃ / s.

[0015] According to one aspect of the above technical solution, the second preset condition is: the acquisition temperature of the EHC housing wall-mounted sensor is less than or equal to -10℃, the first rated parameters are: voltage value of 6kV~8kV, pulse power of 200Hz~400Hz, and the first rated temperature of 5℃.

[0016] According to one aspect of the above technical solution, the third preset condition is: the rate of change of the temperature collected by the exhaust pipe temperature sensor and the rate of change of the temperature collected by the EHC housing wall sensor are both less than 3℃ / s, and the temperature difference between the temperature collected by the exhaust pipe temperature sensor and the temperature collected by the EHC housing wall sensor is less than 5℃. The second energy adjustment mode is: the first zone is continuously energized at 45%~55% of the rated power, the second zone enters a pulse heating state of 20%~25%, and the third zone is compensated for heating at 10%~15% of the rated power. The second rated parameters are: voltage value of 8kV~10kV, pulse power of 500Hz~800Hz, discharge current of 3mA~5mA, and the second rated temperature is: the data collected by the exhaust pipe temperature sensor is greater than 40℃, and the data collected by the EHC housing wall sensor is 50℃~60℃.

[0017] According to one aspect of the above technical solution, the third energy adjustment method is as follows: the first zone is continuously energized at 35%~40% of its rated power, the second zone enters a pulse heating state at 25%~30%, and the third zone is heated at 10%~15% of its rated power. The third rated parameters are: voltage value of 12kV~14kV, pulse power of 1kHz~1.5kHz, third rated temperature of 95℃, and fourth rated temperature of: data collected by the exhaust pipe temperature sensor greater than or equal to 80℃, and data collected by the EHC housing wall-mounted sensor greater than or equal to 100℃.

[0018] The present invention also provides a synergistic activation system of an electrically heated catalyst coupled with plasma, comprising:

[0019] Module arrangement: Arrange the exhaust pipe temperature sensor and the EHC housing wall-mounted sensor;

[0020] Start-up module: When the engine starts, it determines whether the data collected by the exhaust pipe temperature sensor and the EHC housing wall sensor meet the first preset condition. If so, the multi-segment controllable resistance wire inside the EHC is started through the first energy adjustment method so that the temperature rise gradient is less than the rated temperature rise gradient.

[0021] First control module: Determines whether the data collected by the EHC housing wall-attached sensor meets the second preset condition. If so, discharges the sensor with the first rated parameters through the NTP power supply until the data collected by the EHC housing wall-attached sensor reaches the first rated temperature.

[0022] The second control module determines whether the data collected by the exhaust pipe temperature sensor and the EHC housing wall-attach sensor meet the third preset condition. If so, the multi-segment controllable resistance wire inside the EHC is started through the second energy adjustment method, and at the same time, it is discharged through the NTP power supply with the second rated parameters until the data collected by the exhaust pipe temperature sensor and the EHC housing wall-attach sensor reach the second rated temperature.

[0023] The third control module: The multi-segment controllable resistance wire inside the EHC is started through the third energy adjustment method, and at the same time, it is discharged through the NTP power supply with the third rated parameters. When the data collected by the EHC housing wall sensor reaches the third rated temperature, the EHC power is reduced and the NTP discharge frequency is adjusted until the data collected by the exhaust pipe temperature sensor and the EHC housing wall sensor reach the fourth rated temperature.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] This invention achieves full-temperature activation from -20 °C to 150 °C through multi-temperature sensing and energy-level management. In the low-temperature range, stable micro-hot spots are formed by EHC, while reactive oxygen species and free radicals generated by NTPs chemically pre-activate the catalyst surface, constructing a synergistic pathway of gas-phase activation and surface catalysis. Through zoned heating, segmented discharge, and closed-loop power regulation, catalytic activity can be rapidly restored under low-energy conditions, achieving efficient low-temperature conversion of unburned hydrogen, CO, HC, and NOx, ensuring system reliability even in extreme environments.

[0026] By combining EHC partitioned heating with the synergistic effect of NTP active species, rapid and low-energy catalytic activation under extremely low temperature conditions is achieved, significantly improving the low-temperature conversion efficiency of unburned HC, CO, and NOx. NTP can oxidize and remove surface carbon and adsorbed hydrocarbons from the catalyst, promoting the recovery of surface oxidation state and oxygen migration, achieving "chemical repair" of the catalyst during operation, extending catalytic life and reducing regeneration frequency. Attached Figure Description

[0027] Figure 1 This is a flowchart of the synergistic activation method of the electrothermal catalyst coupled with plasma in the first embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure between the electrically heated catalyst and the plasma generator in the first embodiment of the present invention;

[0029] Figure 3 This is a structural block diagram of the synergistic activation system of the electrothermal catalyst and plasma coupling in the second embodiment of the present invention;

[0030] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0031] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of the invention are illustrated in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0032] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0034] Please see Figure 1 The image shows a synergistic activation method of an electrically heated catalyst coupled with plasma according to a first embodiment of the present invention, comprising the following steps:

[0035] S10, where an exhaust pipe temperature sensor and an EHC housing wall-mounted sensor are installed;

[0036] S20, when the engine starts, determine whether the data collected by the exhaust pipe temperature sensor and the EHC housing wall sensor meet the first preset condition. If so, the multi-segment controllable resistance wire inside the EHC is started through the first energy adjustment method so that the temperature rise gradient is less than the rated temperature rise gradient.

[0037] S30, determine whether the data collected by the EHC housing wall-attached sensor meets the second preset condition. If so, discharge the sensor with the first rated parameters through the NTP power supply until the data collected by the EHC housing wall-attached sensor reaches the first rated temperature.

[0038] S40, determine whether the data collected by the exhaust pipe temperature sensor and the EHC housing wall-attached sensor meet the third preset condition. If so, the multi-segment controllable resistance wire inside the EHC is started through the second energy adjustment method, and at the same time, it is discharged through the NTP power supply with the second rated parameters until the data collected by the exhaust pipe temperature sensor and the EHC housing wall-attached sensor reach the second rated temperature.

[0039] S50, the multi-segment controllable resistance wire inside the EHC is started through the third energy adjustment method, and at the same time, it is discharged through the NTP power supply with the third rated parameters. When the data collected by the EHC housing wall sensor reaches the third rated temperature, the EHC power is reduced and the NTP discharge frequency is adjusted until the data collected by the exhaust pipe temperature sensor and the EHC housing wall sensor reach the fourth rated temperature.

[0040] Understandably, this invention achieves full-temperature activation from -20 ℃ to 150 ℃ through multi-temperature sensing and energy hierarchical management. In the low-temperature range, stable micro-hot spots are formed by EHC, while reactive oxygen species and free radicals generated by NTPs are used to chemically pre-activate the catalyst surface, constructing a synergistic pathway of gas-phase activation and surface catalysis. Through zoned heating, segmented discharge, and closed-loop power regulation, catalytic activity can be rapidly restored under low-energy conditions, achieving efficient low-temperature conversion of unburned hydrogen, CO, HC, and NOx, ensuring the system's reliability even in extreme environments.

[0041] By combining EHC partitioned heating with the synergistic effect of NTP active species, rapid and low-energy catalytic activation under extremely low temperature conditions is achieved, significantly improving the low-temperature conversion efficiency of unburned HC, CO, and NOx. NTP can oxidize and remove surface carbon and adsorbed hydrocarbons from the catalyst, promoting the recovery of surface oxidation state and oxygen migration, achieving "chemical repair" of the catalyst during operation, extending catalytic life and reducing regeneration frequency.

[0042] Please see Figure 2 The diagram shows the structure between the electrically heated catalyst EHC and the plasma generator NTP.

[0043] Specifically, in step S10, the exhaust pipe temperature sensor T1 and the EHC housing wall-attachment sensor T2 are both pre-installed in the engine. The electrically heated catalytic converter (EHC) has a first zone, a second zone, and a third zone (which is prior art and not shown in the figure) sequentially from the inlet side to the outlet side. The heating mode of the three zones can be independently adjusted by a controllable resistance wire.

[0044] Furthermore, in step S20, when the engine starts, the temperature of the entire system is between -20℃ and 0℃. During the startup phase, the self-test module begins sampling T1 and T2 at high frequency, and the sampled data is transmitted to the central control unit (ECU). The first preset condition is that the temperature collected by the exhaust pipe temperature sensor is less than or equal to 0℃, and the difference between the temperature collected by the exhaust pipe temperature sensor and the temperature collected by the EHC housing wall-mounted sensor is less than 2℃. When the first preset condition is met, the system controls the control mode of each zone in the EHC using a first energy adjustment method. Specifically, the first zone is energized at 10%~15% of its rated power for 3s~5s, the second zone remains de-energized, and the third zone is intermittently pulsed-heated at 5%~8% of its rated power, with a rated heating gradient of 2℃ / s.

[0045] The first energy regulation method can avoid localized thermal cracking caused by thermal stress. The entire heating process is controlled in a closed loop by the ECU based on feedback from temperature sensor T2, ensuring that the temperature gradient does not exceed 2 ℃ / s.

[0046] Furthermore, in step S30, the second preset condition is: the temperature collected by the EHC housing wall-mounted sensor is less than or equal to -10℃. When the second preset condition is met, the system starts the NTP, and the NTP power supply is adjusted according to the first rated parameters. The first rated parameters are: voltage value of 6kV~8kV, pulse power of 200Hz~400Hz. Discharge is performed with low voltage and low power, so that low-density weak plasma is generated in the dielectric barrier discharge (DBD) region. The active particles (O·, OH·, O3, NO2, etc.) generated by the weak plasma synergistically with the local heat on the EHC surface, which can effectively improve the oxidation state of the catalytic material surface and restore some active sites, while promoting the desorption of low-temperature adsorbates. The system continues to run until the temperature collected by the EHC housing wall-mounted sensor T2 reaches the first rated temperature of 5℃.

[0047] Steps S20 and S30 constitute the first stage of the entire method.

[0048] Furthermore, after the temperature collected by the EHC housing wall-attached sensor T2 reaches the first rated temperature of 5℃, the system enters the second stage (0℃~50℃) rapid heating activation mode. The central control unit ECU collects the temperature data of the exhaust pipe temperature sensor T1 and the EHC housing wall-attached sensor T2 again. When the temperature data meets the third preset condition: the rate of change of the temperature collected by the exhaust pipe temperature sensor and the rate of change of the temperature collected by the EHC housing wall-attached sensor are both less than 3℃ / s, and the temperature difference between the temperature collected by the exhaust pipe temperature sensor and the temperature collected by the EHC housing wall-attached sensor is less than 5℃, the zone temperature is controlled by the second energy adjustment method. The second energy adjustment method is: the first zone is continuously energized at 45%~55% of the rated power, the second zone enters a pulse heating state of 20%~25%, and the third zone is compensated for heating at 10%~15% of the rated power. This segmented boosting method can quickly form a temperature gradient on the inlet side under low temperature conditions, so that the precious metals in the front section of the catalytic channel can be rapidly raised to the mild activation range of 40℃~60℃. During the EHC heating process, the NTP low-energy-density stable discharge mode is simultaneously activated, and the NTP power supply is controlled with the second rated parameters: voltage value of 8kV~10kV, pulse power of 500Hz~800Hz, and discharge current of 3mA~5mA. Through precisely controlled DBD discharge, short-lived free radicals such as O· and OH·, as well as relatively long-lived active species such as O3 and NO2, are continuously generated, achieving the initial decomposition and oxidation of low-temperature adsorbed residues, deposited hydrocarbon films, and unburned emissions from cold starts on the EHC surface. When the second rated temperature is reached: the data collected by the exhaust pipe temperature sensor is greater than 40℃, and the data collected by the EHC housing wall-mounted sensor is 50℃~60℃, the ECU determines that the second stage is complete.

[0049] Furthermore, the system enters the third stage (50℃ to 100℃) of rapid heating and synergistic enhancement. The operating power of each EHC zone is controlled through a third energy adjustment method. The first zone is continuously powered at 35%~40% of its rated power, the second zone enters a pulse heating state at 25%~30%, and the third zone is heated at 10%~15% of its rated power. This zoned heating ensures a controllable temperature flow from the inlet to the outlet within the EHC, maximizing the uniformity of the distribution of active sites on the catalytic surface. Next, the system enters the NTP high-energy-density reactive oxygen species enhancement mode. The NTP power supply is adjusted to the third rated parameters: a voltage of 12kV~14kV and a pulse power of 1kHz~1.5kHz, resulting in a higher density of active particle clusters, such as O•, OH•, and O2, within the DBD region. + N2 + O3 and partially excited state N2 (A 3 Σ u+ Within this temperature range, the EHC surface already possesses a certain activation capacity. The active oxygen species generated by the plasma can directly participate in surface oxidation reactions, such as hydrocarbon chain scission, carbonaceous deposition pre-oxidation, and NO selective oxidation, thereby significantly reducing the ignition temperature of the subsequent exhaust gas when it enters the DOC+CDPF aftertreatment system.

[0050] To prevent localized overheating in the EHC region, the ECU sets a warning threshold of 95°C for the third rated temperature. When the EHC housing contact sensor T2 approaches this temperature, the system automatically reduces the EHC power and adjusts the NTP discharge frequency to ensure the overall temperature remains within the 90°C~100°C range. When the system operates stably and meets the conditions of a fourth rated temperature T2≥100°C and T1≥80°C, the third stage is completed, and the electrically heated catalytic converter EHC officially enters normal operating mode.

[0051] In summary, the synergistic activation method of the electrothermal catalyst coupled with plasma in the above embodiments of the present invention achieves rapid and low-energy catalytic activation under extremely low temperature conditions through the synergistic effect of EHC partition heating and NTP active species, significantly improving the low-temperature conversion efficiency of unburned HC, CO, and NOx. NTP can oxidize and remove surface carbon and adsorbed hydrocarbons on the catalyst, promote the recovery of surface oxidation state and oxygen migration, achieve "chemical repair" of the catalyst during operation, extend catalytic life, and reduce regeneration frequency.

[0052] Please refer to Figure 3 The figure shows a synergistic activation system of an electrically heated catalyst coupled with plasma in a second embodiment of the present invention, comprising:

[0053] Arrangement Module 11: Arrange the exhaust pipe temperature sensor and the EHC housing wall-mounted sensor;

[0054] Start-up module 12: When the engine starts, it determines whether the data collected by the exhaust pipe temperature sensor and the EHC housing wall sensor meet the first preset condition. If so, the multi-segment controllable resistance wire inside the EHC is started through the first energy adjustment method so that the temperature gradient is less than the rated temperature gradient.

[0055] First control module 13: Determines whether the data collected by the EHC housing wall-attached sensor meets the second preset condition. If so, discharges the sensor with the first rated parameters through the NTP power supply until the data collected by the EHC housing wall-attached sensor reaches the first rated temperature.

[0056] Second control module 14: Determine whether the data collected by the exhaust pipe temperature sensor and the EHC housing wall-attached sensor meet the third preset condition. If so, the multi-segment controllable resistance wire inside the EHC is started through the second energy adjustment method, and at the same time, it is discharged through the NTP power supply with the second rated parameters until the data collected by the exhaust pipe temperature sensor and the EHC housing wall-attached sensor reach the second rated temperature.

[0057] The third control module 15: The multi-segment controllable resistance wire inside the EHC is started through the third energy adjustment method, and at the same time, it is discharged through the NTP power supply with the third rated parameters. When the data collected by the EHC housing wall sensor reaches the third rated temperature, the EHC power is reduced and the NTP discharge frequency is adjusted until the data collected by the exhaust pipe temperature sensor and the EHC housing wall sensor reach the fourth rated temperature.

[0058] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0059] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A synergistic activation method for an electrically heated catalyst coupled with plasma, characterized in that, Includes the following steps: Install exhaust pipe temperature sensors and EHC housing wall-mounted sensors; When the engine starts, it is determined whether the data collected by the exhaust pipe temperature sensor and the EHC housing wall sensor meet the first preset condition. If so, the multi-segment controllable resistance wire inside the EHC is started through the first energy adjustment method so that the temperature rise gradient is less than the rated temperature rise gradient. Determine whether the data collected by the EHC housing wall-attached sensor meets the second preset condition. If so, discharge the sensor using the NTP power supply with the first rated parameters until the data collected by the EHC housing wall-attached sensor reaches the first rated temperature. Determine whether the data collected by the exhaust pipe temperature sensor and the EHC housing wall-attach sensor meet the third preset condition. If so, the multi-segment controllable resistance wire inside the EHC is started through the second energy adjustment method, and at the same time, it is discharged through the NTP power supply with the second rated parameters until the data collected by the exhaust pipe temperature sensor and the EHC housing wall-attach sensor reach the second rated temperature. The multi-segment controllable resistance wire inside the EHC is started through the third energy adjustment method, and at the same time, it is discharged through the NTP power supply with the third rated parameters. When the data collected by the EHC housing wall-mounted sensor reaches the third rated temperature, the EHC power is reduced and the NTP discharge frequency is adjusted until the data collected by the exhaust pipe temperature sensor and the EHC housing wall-mounted sensor reach the fourth rated temperature. The EHC is divided into a first section, a second section, and a third section from the inlet side to the outlet side. The third preset condition is: the rate of change of the temperature collected by the exhaust pipe temperature sensor and the rate of change of the temperature collected by the EHC housing wall sensor are both less than 3℃ / s, and the temperature difference between the temperature collected by the exhaust pipe temperature sensor and the temperature collected by the EHC housing wall sensor is less than 5℃. The second energy adjustment mode is: the first zone is continuously powered at 45%~55% of the rated power, the second zone enters a pulse heating state of 20%~25%, and the third zone is compensated for heating at 10%~15% of the rated power. The second rated parameters are: voltage value of 8kV~10kV, pulse power of 500Hz~800Hz, discharge current of 3mA~5mA, and the second rated temperature is: the data collected by the exhaust pipe temperature sensor is greater than 40℃, and the data collected by the EHC housing wall sensor is 50℃~60℃. The third power adjustment method is as follows: the first zone is continuously powered at 35%~40% of its rated power, the second zone enters a pulse heating state at 25%~30%, and the third zone is heated at 10%~15% of its rated power. The third rated parameters are: voltage value of 12kV~14kV, pulse power of 1kHz~1.5kHz, and third rated temperature of 95℃. The fourth rated temperature is: the data collected by the exhaust pipe temperature sensor is greater than or equal to 80℃, and the data collected by the EHC housing wall-mounted sensor is greater than or equal to 100℃.

2. The synergistic activation method of the electrothermal catalyst coupled with plasma according to claim 1, characterized in that, The first preset condition is that the temperature collected by the exhaust pipe temperature sensor is less than or equal to 0°C, and the difference between the temperature collected by the exhaust pipe temperature sensor and the temperature collected by the EHC housing wall-mounted sensor is less than 2°C.

3. The synergistic activation method of the electrothermal catalyst coupled with plasma according to claim 1, characterized in that, The first power regulation method is as follows: the first zone is powered on at 10%~15% of the rated power for 3s~5s, the second zone is kept in a de-powered state, and the third zone is intermittently pulsed heated at 5%~8% of the rated power, and the rated heating gradient is 2℃ / s.

4. The synergistic activation method of the electrothermal catalyst coupled with plasma according to claim 1, characterized in that, The second preset condition is: the acquisition temperature of the EHC housing wall-mounted sensor is less than or equal to -10℃, the first rated parameters are: voltage value of 6kV~8kV, pulse power of 200Hz~400Hz, and the first rated temperature of 5℃.

5. A synergistic activation system coupling an electrically heated catalyst and plasma, characterized in that, include: Module arrangement: Arrange the exhaust pipe temperature sensor and the EHC housing wall-mounted sensor; Start-up module: When the engine starts, it determines whether the data collected by the exhaust pipe temperature sensor and the EHC housing wall sensor meet the first preset condition. If so, the multi-segment controllable resistance wire inside the EHC is started through the first energy adjustment method to make the temperature rise gradient less than the rated temperature rise gradient. The EHC is provided with a first partition, a second partition and a third partition in sequence from the inlet side to the outlet side. First control module: Determines whether the data collected by the EHC housing wall-attached sensor meets the second preset condition. If so, discharges the sensor with the first rated parameters through the NTP power supply until the data collected by the EHC housing wall-attached sensor reaches the first rated temperature. The second control module determines whether the data collected by the exhaust pipe temperature sensor and the EHC housing wall-mounted sensor meet the third preset condition. If so, the multi-segment controllable resistance wire inside the EHC is activated through the second energy adjustment method, and simultaneously discharged through the NTP power supply with the second rated parameters until the data collected by the exhaust pipe temperature sensor and the EHC housing wall-mounted sensor reach the second rated temperature. The third preset condition is: the rate of change of the temperature collected by the exhaust pipe temperature sensor and the rate of change of the temperature collected by the EHC housing wall-mounted sensor are both less than 3℃ / s, and the temperature collected by the exhaust pipe temperature sensor and the temperature collected by the EHC housing wall-mounted sensor are both less than 3℃ / s. The temperature difference between the temperatures collected by the wall-mounted sensors is less than 5℃. The second power adjustment method is as follows: the first zone is continuously powered at 45%~55% of its rated power, the second zone enters a pulse heating state of 20%~25%, and the third zone is compensated for heating at 10%~15% of its rated power. The second rated parameters are: voltage value of 8kV~10kV, pulse power of 500Hz~800Hz, discharge current of 3mA~5mA, and the second rated temperature is: the data collected by the exhaust pipe temperature sensor is greater than 40℃, and the data collected by the EHC housing wall-mounted sensor is 50℃~60℃. The third control module: The multi-segment controllable resistance wire inside the EHC is activated through the third energy adjustment method, and simultaneously discharged through the NTP power supply with the third rated parameters. When the data collected by the EHC housing wall-mounted sensor reaches the third rated temperature, the EHC power is reduced and the NTP discharge frequency is adjusted until the data collected by the exhaust pipe temperature sensor and the EHC housing wall-mounted sensor reach the fourth rated temperature. The third energy adjustment method is as follows: the first zone is continuously energized at 35%~40% of the rated power, the second zone enters a pulse heating state of 25%~30%, and the third zone is heated at 10%~15% of the rated power. The third rated parameters are: voltage value of 12kV~14kV, pulse power of 1kHz~1.5kHz, and the third rated temperature of 95℃. The fourth rated temperature is: the data collected by the exhaust pipe temperature sensor is greater than or equal to 80℃, and the data collected by the EHC housing wall-mounted sensor is greater than or equal to 100℃.

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