Aftertreatment assembly control method, aftertreatment assembly and vehicle

Abstract

This invention discloses an aftertreatment assembly control method, an aftertreatment assembly, and a vehicle, belonging to the field of vehicle technology. The aftertreatment assembly includes a blower and an electric heater. By acquiring real-time information on the vehicle's operating conditions, engine operating conditions, battery operating conditions, and the pressure difference across the DPF, and when the vehicle is being charged using an external power source, the engine is off, and the last obtained pressure difference across the DPF before engine shutdown is greater than or equal to a first regeneration threshold, the electric heater and blower are activated to regenerate the DPF. In other words, by providing sufficient power through an external power source, the DPF can be fully regenerated without starting the engine, reducing disturbance to the user, and eliminating the need for fuel, resulting in lower costs.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and more particularly to an aftertreatment assembly control method, an aftertreatment assembly, and a vehicle. Background Technology

[0002] Existing exhaust aftertreatment devices typically consist of DOC (Diesel Oxidation Catalyst), DPF (Diesel Particulate Filter), SCR (Selective Catalytic Reduction) and ASC (Ammonia Slip Catalyst). These four units can remove harmful pollutants such as PM and NOx from diesel engine exhaust, resulting in clean exhaust gas, while also meeting noise regulations.

[0003] In addition to oxidizing CO (carbon monoxide), NO (nitric oxide), and HC (hydrocarbons) in the exhaust gas, DOC can also oxidize unburned fuel in the exhaust gas and release heat, thereby enabling SCR to ignite quickly and promoting DPF regeneration.

[0004] However, DOC is expensive, so some manufacturers have begun to try removing DOC from exhaust aftertreatment devices and using electric heaters to heat the exhaust gas entering the DPF to ensure DPF regeneration and SCR operation. However, electric heaters consume a lot of electricity and can only be used for a short time while the vehicle is in motion, making it difficult for the DPF to regenerate sufficiently, which can easily lead to DPF clogging. Summary of the Invention

[0005] The purpose of this invention is to provide an aftertreatment assembly control method, an aftertreatment assembly, and a vehicle, which can not only reduce the cost of the aftertreatment assembly, but also enable the DPF to be fully regenerated and avoid clogging problems.

[0006] To achieve the above objectives, the following technical solution is provided:

[0007] An aftertreatment assembly control method is provided. The aftertreatment assembly includes a DPF, a blower, and an electric heater. The inlet of the DPF is connected to the exhaust port of the vehicle's engine and the air outlet of the blower. The blower is used to introduce air into the DPF. The electric heater is located at the inlet of the DPF and is electrically connected to the vehicle's battery.

[0008] The aftertreatment assembly control method includes the following steps:

[0009] The vehicle's operating condition, the engine's operating condition, the battery's operating condition, and the pressure difference across the DPF are acquired in real time.

[0010] When the vehicle is being charged using an external power source, the engine is off, and the pressure difference across the DPF obtained last time before the engine is off is greater than or equal to the first regeneration threshold, the electric heater and the blower are turned on.

[0011] As a preferred technical solution of the above-mentioned after-treatment assembly control method, the electric heater and the blower are turned off after a preset time has elapsed since they were turned on.

[0012] As a preferred technical solution for the above-mentioned aftertreatment assembly control method, the following steps are also included:

[0013] Confirm that the engine has started;

[0014] The electric heater is turned on when the pressure difference across the DPF is greater than or equal to the first regeneration threshold and the remaining charge of the battery is not less than the first preset charge.

[0015] As a preferred technical solution of the above-mentioned post-treatment assembly control method, after turning on the electric heater when the pressure difference across the DPF is greater than or equal to the first regeneration threshold and the remaining charge of the battery is not less than the first preset charge, the method further includes the following steps:

[0016] When the pressure difference across the DPF is less than a first preset pressure difference or the remaining charge of the battery is less than a first charge threshold, the electric heater is turned off; the first preset pressure difference is less than the first regeneration threshold; the first charge threshold is less than the first preset charge.

[0017] As a preferred technical solution for the above-mentioned aftertreatment assembly control method, the following steps are also included:

[0018] When the pressure difference across the DPF is greater than or equal to the first regeneration threshold, and the remaining charge of the battery is not less than the second preset charge, and the vehicle is in a preset operating condition, the electric heater is turned on, and the engine charges the battery; the second preset charge is less than the first charge threshold.

[0019] As a preferred technical solution of the above-mentioned aftertreatment assembly control method, when the pressure difference across the DPF is greater than or equal to a first regeneration threshold, the remaining charge of the battery is not less than a second preset charge, and the vehicle is in a preset vehicle operating condition, after turning on the electric heater and causing the engine to charge the battery, the method further includes the following steps:

[0020] When the pressure difference across the DPF is less than a second preset pressure difference or the remaining charge of the battery is less than a second charge threshold, the electric heater is turned off; the second preset pressure difference is less than the first regeneration threshold; the second charge threshold is less than the second preset charge.

[0021] As a preferred technical solution for the above-mentioned aftertreatment assembly control method, the following steps are also included:

[0022] The electric heater is turned on when the pressure difference across the DPF is greater than or equal to the second regeneration threshold; the second regeneration threshold is greater than the first regeneration threshold.

[0023] As a preferred technical solution of the above-mentioned aftertreatment assembly control method, after turning on the electric heater when the pressure difference across the DPF is greater than or equal to the second regeneration threshold, the method further includes the following steps:

[0024] When the engine is operating under preset operating conditions, the engine charges the battery.

[0025] As a preferred technical solution of the above-mentioned aftertreatment assembly control method, the preset engine operating conditions include high-load operating conditions; and / or,

[0026] The vehicle's preset operating conditions include long downhill driving conditions; and / or,

[0027] The first preset power level includes 100% full charge capacity; and / or,

[0028] The first power threshold includes 90% full charge capacity; and / or,

[0029] The second preset power level includes 80% of the full charge capacity; and / or,

[0030] The second power threshold includes 75% full charge capacity.

[0031] As a preferred technical solution of the above-mentioned aftertreatment assembly control method, when the vehicle is in a long downhill condition, the engine stops injecting fuel, and the engine is able to exhaust gas.

[0032] As a preferred technical solution of the above-mentioned after-treatment assembly control method, when the electric heater is turned on, the electric heater is made to operate at its rated power.

[0033] To achieve the above objectives, a post-processing assembly is also provided, including:

[0034] The system comprises a DPF, a blower, and an electric heater. The inlet of the DPF is connected to the exhaust port of the vehicle's engine and the air outlet of the blower. The blower is used to introduce air into the DPF. The electric heater is located at the inlet of the DPF and is electrically connected to the vehicle's battery.

[0035] The information acquisition module is used to acquire the operating conditions of the vehicle, the engine, the battery, and the pressure difference before and after the DPF.

[0036] The control module is used to turn on the electric heater and the blower when the vehicle is being charged using an external power source, the engine is off, and the pressure difference across the DPF is greater than or equal to a first regeneration threshold.

[0037] To achieve the above objectives, a vehicle is also provided that employs the aftertreatment assembly control method described in any of the preceding items.

[0038] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0039] The present invention discloses an aftertreatment assembly control method, an aftertreatment assembly, and a vehicle. The aftertreatment assembly includes a blower and an electric heater. By acquiring real-time information on the vehicle's operating conditions, the engine's operating conditions, the battery's operating conditions, and the pressure difference across the DPF, and when the vehicle is being charged using an external power source, the engine is off, and the pressure difference across the DPF last acquired before the engine is off is greater than or equal to a first regeneration threshold, the electric heater and the blower are activated to regenerate the DPF. In other words, by providing sufficient power through an external power source, the DPF can be fully regenerated without starting the engine, reducing disturbance to the user, and eliminating the need for fuel, resulting in lower costs. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the post-processing assembly in an embodiment of the present invention;

[0041] Figure 2 This is a flowchart of the post-processing assembly control method in an embodiment of the present invention.

[0042] Figure label:

[0043] 1. DPF; 2. Blower; 3. Electric heater; 4. SCR; 5. ASC; 6. Mixer. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0045] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0046] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0047] In the description of this invention, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0048] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0049] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0050] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0051] like Figure 1 As shown, this embodiment provides an aftertreatment assembly and a vehicle. The vehicle includes an engine, a battery, and an aftertreatment assembly. The aftertreatment assembly includes a DPF1, a blower 2, and an electric heater 3. The inlet of the DPF1 is connected to the exhaust port of the engine and the air outlet of the blower 2. The blower 2 is used to introduce air into the DPF1. The electric heater 3 is located at the inlet of the DPF1 and is electrically connected to the battery.

[0052] like Figure 2 As shown, this embodiment also provides an aftertreatment assembly control method, including the following steps:

[0053] S1. Real-time acquisition of vehicle operating conditions, engine operating conditions, battery operating conditions, and the pressure difference across DPF1;

[0054] S2. When the vehicle is being charged using an external power source, the engine is off, and the pressure difference across DPF1 obtained before the engine is off is greater than or equal to the first regeneration threshold, turn on the electric heater 3 and the blower 2.

[0055] It should be noted that the engine needs to be running when acquiring the pressure difference across DPF1. For example, when the engine is running, the pressure difference across DPF1 is acquired in real time, and the pressure difference across DPF1 last acquired before the engine is shut down is compared with a first regeneration threshold as a reference value. When the vehicle is being charged using an external power source, and the engine is shut down, and the pressure difference across DPF1 last acquired before the engine is shut down is greater than or equal to the first regeneration threshold, the electric heater 3 and the blower 2 are turned on to regenerate DPF1.

[0056] The aftertreatment assembly control method of this embodiment acquires the vehicle's operating conditions, engine operating conditions, battery operating conditions, and the front-to-back pressure difference of DPF1 in real time. When the vehicle is being charged using an external power source and the engine is off, and the front-to-back pressure difference of DPF1 last acquired before the engine is off is greater than or equal to a first regeneration threshold, the electric heater 3 and blower 2 are turned on to regenerate DPF1. In other words, when the vehicle is being charged using an external power source and DPF1 needs to be regenerated, sufficient power is provided by the external power source, so that DPF1 can be fully regenerated. At the same time, there is no need to start the engine, which reduces disturbance to the user, and there is no need to use fuel, resulting in lower costs.

[0057] It should be noted that vehicle operating conditions include conditions such as the vehicle being on a long downhill slope and the vehicle being charged. Engine operating conditions can be determined through information such as engine load, engine crankshaft speed, and engine exhaust temperature. Battery operating conditions can be determined through battery state of charge, such as the remaining battery capacity and battery charging parameters. The front-to-rear pressure difference of DPF1 can be obtained through a differential pressure sensor. The methods for obtaining vehicle operating conditions, engine operating conditions, battery operating conditions, and the front-to-rear pressure difference of DPF1 are all existing technologies and will not be described in detail here.

[0058] This embodiment does not limit the method for obtaining the vehicle's operating conditions, the engine's operating conditions, the battery's operating conditions, and the front and rear pressure difference of DPF1, nor the type and model of the electric heater 3 and the blower 2.

[0059] Optionally, the electric heater 3 and the blower 2 are turned off after a preset time has elapsed since they were turned on. For example, a timer can be set, and when the electric heater 3 and the blower 2 are turned on, the timer starts counting down. Then, when the timer's elapsed duration equals the preset duration, the electric heater 3 and the blower 2 are turned off. It should be noted that the preset duration is a known value and can be determined through experience or repeated trials; it is not limited here.

[0060] Optionally, the post-processing assembly control method of this embodiment further includes the following steps:

[0061] Confirm engine start;

[0062] When the pressure difference across DPF1 is greater than or equal to the first regeneration threshold and the remaining battery charge is not less than the first preset charge, the electric heater 3 is turned on.

[0063] If the voltage difference across DPF1 is greater than or equal to the first regeneration threshold, it indicates that the voltage difference across DPF1 has increased and regeneration is required. However, at this time, the voltage difference across DPF1 is not too high, so the remaining battery capacity is used as a reference condition.

[0064] When the remaining battery charge is not less than the first preset charge, it indicates that the battery has sufficient remaining charge to support DPF1 regeneration. Therefore, during vehicle operation, with the engine running, and when the pressure difference across DPF1 is greater than or equal to the first regeneration threshold, and the remaining battery charge is not less than the first preset charge, the electric heater 3 is activated, thereby enabling DPF1 to actively regenerate, thus preventing DPF1 from becoming clogged.

[0065] It should be noted that the first preset power level is a known value, which can be determined based on experience or repeated experiments, and is not limited here. For example, the first preset power level includes 100% full charge capacity.

[0066] Optionally, when the voltage difference across DPF1 is greater than or equal to the first regeneration threshold and the remaining battery charge is not less than the first preset charge, after turning on the electric heater 3, the following steps are also included:

[0067] When the pressure difference across DPF1 is less than the first preset pressure difference, the electric heater 3 is turned off; the first preset pressure difference is less than the first regeneration threshold.

[0068] When the electric heater 3 is turned on to regenerate the DPF1, the electric heater 3 is turned off when the pressure difference across the DPF1 is less than the first preset pressure difference. At this time, the pressure difference across the DPF1 decreases, and there will be no blockage problem for the time being, so the electric heater 3 can be turned off to avoid the electric heater 3 excessively consuming the battery power.

[0069] As an alternative, when the voltage difference across DPF1 is greater than or equal to the first regeneration threshold and the remaining battery charge is not less than the first preset charge, after turning on the electric heater 3, the following steps are also included:

[0070] When the remaining battery power is less than the first power threshold, the electric heater 3 is turned off; the first power threshold is less than the first preset power.

[0071] When the electric heater 3 is turned on to regenerate the DPF1, if the remaining battery charge is less than the first charge threshold, it means that the electric heater 3 has been working for a period of time, the pressure difference across the DPF1 has decreased, and there will be no blockage problem for the time being. The electric heater 3 can then be turned off to avoid the electric heater 3 from excessively consuming the battery charge.

[0072] It should be noted that the first power threshold is a known value, which can be determined based on experience or repeated experiments, and is not limited here. For example, the first power threshold includes 90% full charge capacity.

[0073] Optionally, the post-processing assembly control method of this embodiment further includes the following steps:

[0074] When the pressure difference across DPF1 is greater than or equal to the first regeneration threshold, the remaining battery charge is not less than the second preset charge, and the vehicle is in a preset operating condition, the electric heater 3 is turned on and the engine charges the battery; the second preset charge is less than the first charge threshold.

[0075] When the remaining battery charge is not less than the second preset charge level, it indicates that the remaining battery charge is insufficient. If the remaining battery charge is used solely to power the electric heater 3, the remaining battery charge will be rapidly depleted, affecting the vehicle's performance.

[0076] When the vehicle is in a preset operating condition, the engine charges the battery. This indicates that the engine's power output is sufficient for normal vehicle operation, with a surplus power to drive the generator and charge the battery. This replenishes the battery's charge and prevents its rapid depletion while ensuring the remaining battery charge is not less than a second preset charge level. For example, the preset operating condition includes a long downhill slope.

[0077] It should be noted that the second preset power level is a known value and can be determined based on experience or repeated experiments, and is not limited here. For example, the second preset power level includes 80% of the full charge capacity.

[0078] Optionally, when the vehicle is on a long downhill slope, even if the engine stops providing power, the vehicle can continue to move due to inertia. Furthermore, the engine can still provide sufficient power to drive the generator and charge the battery. In this situation, stopping fuel injection while allowing the engine to exhaust gases not only ensures DPF1 regeneration but also achieves energy savings. It is understandable that when the vehicle is on a long downhill slope, placing it in any gear other than neutral and releasing the accelerator will stop fuel injection while allowing the engine to exhaust gases.

[0079] Optionally, when the pressure difference across DPF1 is greater than or equal to the first regeneration threshold, the remaining battery charge is not less than the second preset charge, and the vehicle is in a preset operating condition, after turning on the electric heater 3 and charging the battery with the engine, the following steps are also included:

[0080] When the pressure difference across DPF1 is less than the second preset pressure difference, the electric heater 3 is turned off; the second preset pressure difference is less than the first regeneration threshold.

[0081] When the electric heater 3 is turned on to regenerate the DPF1, the electric heater 3 is turned off when the pressure difference across the DPF1 is less than the second preset pressure difference. At this time, the pressure difference across the DPF1 decreases, and there will be no blockage problem temporarily, so the electric heater 3 can be turned off to avoid the electric heater 3 excessively consuming the battery power.

[0082] As an alternative, when the pressure difference across DPF1 is greater than or equal to the first regeneration threshold, the remaining battery charge is not less than the second preset charge, and the vehicle is in a preset operating condition, after turning on the electric heater 3 and charging the battery with the engine, the following steps are also included:

[0083] When the electric heater 3 is turned on to regenerate the DPF1, the electric heater 3 is turned off when the remaining battery power is less than the second power threshold; the second power threshold is less than the second preset power.

[0084] When the electric heater 3 is turned on to regenerate the DPF1, if the remaining battery charge is less than the second charge threshold, it means that the electric heater 3 has been working for a period of time, the pressure difference across the DPF1 has decreased, and there will be no blockage problem for the time being. The electric heater 3 can then be turned off to avoid the electric heater 3 from excessively consuming the battery charge.

[0085] It should be noted that the second power threshold is a known value and can be determined based on experience or repeated experiments, and is not limited here. For example, the second power threshold includes 75% full charge capacity.

[0086] Optionally, the post-processing assembly control method of this embodiment further includes the following steps:

[0087] When the pressure difference across DPF1 is greater than or equal to the second regeneration threshold, the electric heater 3 is turned on; the second regeneration threshold is greater than the first regeneration threshold.

[0088] When the pressure difference across DPF1 is greater than or equal to the second regeneration threshold, it indicates that the pressure difference across DPF1 has increased further. If DPF1 is not regenerated, a blockage problem will occur. Therefore, at this point, regardless of other conditions, the electric heater 3 is directly turned on to regenerate DPF1, thereby ensuring that DPF1 does not become blocked.

[0089] Optionally, after turning on the electric heater 3 when the pressure difference across DPF1 is greater than or equal to the second regeneration threshold, the following steps are also included:

[0090] When the engine is operating at its preset operating condition, the engine charges the battery.

[0091] When the engine is operating under preset operating conditions, charging the battery with the engine indicates that the engine is generating sufficient power. A portion of this power can be used to drive the generator to charge the battery, thus replenishing its charge. This, in turn, reserves some power for DPF1 regeneration, which helps prevent DPF1 blockage. For example, preset engine operating conditions include high-load conditions.

[0092] Optionally, when the electric heater 3 is turned on, the electric heater 3 is operated at its rated power to ensure that the electric heater 3 can provide sufficient heat to regenerate the DPF1 and ensure the efficiency of the DPF1 regeneration.

[0093] Optionally, the aftertreatment assembly also includes SCR4 and ASC5. DPF1, SCR4 and ASC5 are connected sequentially along the exhaust gas flow direction. In other words, the aftertreatment assembly in this embodiment does not need to be equipped with DOC, and DPF1, SCR4 and ASC5 can be guaranteed to work normally, thereby significantly reducing the cost of the aftertreatment assembly.

[0094] Optionally, two SCR4s are provided, and the two SCR4s are set in series, which improves the aftertreatment assembly's ability to reduce nitrogen oxides, can adapt to higher engine exhaust emissions, and improve exhaust gas purification effect.

[0095] Optionally, the aftertreatment assembly also includes a mixer 6, which includes a first mixing inlet connected to the DPF1, a second mixing inlet connected to the urea supply device, and a mixing outlet connected to the inlet of the SCR4. The mixer 6 mixes the exhaust gas with the ammonia (NH3) formed by the hydrolysis of the urea solution, thereby improving the mixing uniformity and mixing efficiency of the exhaust gas and ammonia. This is beneficial to improving the NOx conversion rate of the SCR4, and thus enhancing the purification effect of the aftertreatment assembly on the exhaust gas.

[0096] Optionally, the mixing inlet and mixing outlet are located on the same side of the mixer 6, which makes the aftertreatment assembly have a U-shaped structure, reducing the space occupied by the aftertreatment assembly and facilitating the overall vehicle layout.

[0097] The after-treatment assembly of this embodiment can execute the after-treatment assembly control method as described above. Specifically, the after-treatment assembly further includes an information acquisition module and a control module. The information acquisition module is used to acquire the vehicle's operating condition, the engine's operating condition, the battery's operating condition, and the front-to-back pressure difference of DPF1. The control module is used to turn on the electric heater 3 and the blower 2 when the vehicle is being charged using an external power source, the engine is off, and the front-to-back pressure difference of DPF1 is greater than or equal to the first regeneration threshold.

[0098] The vehicle in this embodiment employs the aftertreatment assembly control method described above. Specifically, the vehicle in this embodiment includes the aftertreatment assembly described above.

[0099] The aftertreatment assembly and vehicle of this embodiment have the same functions and beneficial effects as the aftertreatment assembly control method described above, and will not be repeated here.

[0100] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A method of controlling a post-processing assembly, characterized by, The post-processing assembly comprises a DPF, a blower and an electric heater, an inlet of the DPF is communicated with an exhaust port of an engine of the vehicle and an air outlet of the blower respectively, the blower is used for introducing air into the DPF, the electric heater is arranged at the inlet of the DPF, and the electric heater is electrically connected with a battery of the vehicle; The post-processing assembly control method comprises the following steps: Real-time acquisition of the working condition of the vehicle, the working condition of the engine, the working condition of the battery and the pressure difference before and after the DPF; When the vehicle is charged by an external power supply, the engine is turned off, and the pressure difference before and after the DPF obtained last time before the engine is turned off is greater than or equal to a first regeneration threshold, the electric heater and the blower are started; Further comprising the following steps: Determination of the engine starting; When the pressure difference before and after the DPF is greater than or equal to the first regeneration threshold, and the remaining capacity of the battery is not less than a first preset capacity, the electric heater is started; After the pressure difference before and after the DPF is greater than or equal to the first regeneration threshold, and the remaining capacity of the battery is not less than the first preset capacity, the electric heater is started, further comprising the following steps: When the pressure difference before and after the DPF is less than a first preset pressure difference or the remaining capacity of the battery is less than a first capacity threshold, the electric heater is turned off; the first preset pressure difference is less than the first regeneration threshold; and the first capacity threshold is less than the first preset capacity; Further comprising the following steps: When the pressure difference before and after the DPF is greater than or equal to the first regeneration threshold, the remaining capacity of the battery is not less than a second preset capacity, and the vehicle is in a vehicle preset working condition, the electric heater is started, and the engine charges the battery; the second preset capacity is less than the first capacity threshold; After the pressure difference before and after the DPF is greater than or equal to the first regeneration threshold, the remaining capacity of the battery is not less than the second preset capacity, and the vehicle is in the vehicle preset working condition, the electric heater is started, and the engine charges the battery, further comprising the following steps: When the pressure difference before and after the DPF is less than a second preset pressure difference or the remaining capacity of the battery is less than a second capacity threshold, the electric heater is turned off; the second preset pressure difference is less than the first regeneration threshold; and the second capacity threshold is less than the second preset capacity; Further comprising the following steps: When the pressure difference before and after the DPF is greater than or equal to a second regeneration threshold, the electric heater is started; the second regeneration threshold is greater than the first regeneration threshold; After the pressure difference before and after the DPF is greater than or equal to the second regeneration threshold, the electric heater is started, further comprising the following steps: When the working condition of the engine is in an engine preset working condition, the engine charges the battery; The engine preset working condition comprises a high load working condition; and / or, The vehicle preset working condition comprises a long downhill working condition; And / or, The first preset capacity comprises 100% full capacity; and / or, The first capacity threshold comprises 90% full capacity; and / or, The second preset capacity comprises 80% full capacity; and / or, The second capacity threshold comprises 70% full capacity. The second electric quantity threshold comprises 75% full capacity.

2. The post-processing assembly control method of claim 1, wherein After the electric heater and the air blower are turned on for a preset time length, the electric heater and the air blower are turned off.

3. The post-processing assembly control method of claim 1, wherein When the vehicle is in a long downhill working condition, the engine stops fuel injection, and the engine can exhaust.

4. The post-processing assembly control method of any of claims 1-3, wherein, When the electric heater is turned on, the electric heater works at a rated power.

5. A post-processing assembly characterized by, The aftertreatment assembly comprises: A DPF, an air blower and an electric heater, an inlet of the DPF is in communication with an exhaust port of an engine of a vehicle and an air outlet of the air blower respectively, the air blower is used for introducing air into the DPF, the electric heater is arranged at the inlet of the DPF, and the electric heater is electrically connected with a battery of the vehicle; An information acquisition module is configured to acquire a working condition of the vehicle, a working condition of the engine, a working condition of the battery and a differential pressure before and after the DPF; A control module is configured to turn on the electric heater and the air blower when the vehicle is charged by an external power supply, the engine is turned off, and the differential pressure before and after the DPF is greater than or equal to a first regeneration threshold.

6. Vehicle, characterized in that The aftertreatment assembly control method according to any one of claims 1-4.

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