Control Method, Device, Equipment and Medium of a Post-Processing System

Abstract

The present disclosure relates to a control method, device, equipment and medium for a post-treatment system. The method includes: obtaining a first actual temperature measured by a sensor on the exhaust pipe upstream of the SCR in the post-treatment system, and a second actual temperature measured by a sensor on the exhaust pipe upstream of the DOC in the post-treatment system; if the first actual temperature is greater than a set first temperature threshold and the second actual temperature is greater than a set second temperature threshold, controlling part or all of the exhaust gas flowing out of the supercharger in the post-treatment system to enter the DOC after passing through the radiator in the heat dissipation system; wherein, the first temperature threshold is greater than the second temperature threshold. The present disclosure can reduce the temperature of the engine exhaust gas in the SCR and enable the SCR to have a high conversion efficiency for NO x under more operating conditions.

Description

Technical Field

[0001] The present disclosure relates to the technical field of engine aftertreatment, and particularly to a control method, device, equipment and medium for an aftertreatment system. Background Art

[0002] Currently, vehicles generally use an aftertreatment system to reduce NO x (Nitrogen Oxidation) and particulate matter in the engine exhaust, so that the exhaust gas emitted by the vehicle meets certain requirements.

[0003] The aftertreatment system consists of a DOC (Diesel Oxidation Catalysis), a DPF (Diesel Particulate Filter), an SCR (Selective Catalytic Reduction), and an ASC (Ammonia Slip Catalyst). The function of the DOC is to oxidize HC (hydrocarbons), CO (carbon monoxide), and NO (nitric oxide) in the engine exhaust and increase the exhaust gas temperature. The DPF relies on the filter material to capture the particulate matter in the exhaust gas. Since it will be clogged after long-term use, it needs to be regenerated and cleaned regularly. The function of the SCR is to remove NO x , using urea as a reducing agent, and reacting with NO x to N2 (nitrogen) and H2O (water) under the action of a selective catalyst.

[0004] During the operation of the engine, since the operating temperature range of the SCR is too large, it may cause the conversion efficiency of the SCR for NO x to be very low under certain working conditions, and further cause the NO x emission to be too high. Summary of the Invention

[0005] The present disclosure provides a control method, device, equipment and medium for an aftertreatment system, which can reduce the temperature of the engine exhaust gas in the SCR and enable the SCR to have a higher conversion efficiency for NO x under more working conditions.

[0006] According to the first aspect of the embodiments of the present disclosure, a control method for an aftertreatment system is provided. The method includes:

[0007] Obtaining a first actual temperature measured by a sensor on the exhaust pipe upstream of the SCR in the aftertreatment system, and a second actual temperature measured by a sensor on the exhaust pipe upstream of the DOC in the aftertreatment system;

[0008] If the first actual temperature is greater than the set first temperature threshold and the second actual temperature is greater than the set second temperature threshold, then control part or all of the exhaust gas flowing out of the supercharger in the aftertreatment system to flow through the radiator in the heat dissipation system and then enter the DOC; wherein, the first temperature threshold is greater than the second temperature threshold.

[0009] The technical solution provided by the embodiments of the present disclosure determines that the engine is in a working condition with a relatively high exhaust gas temperature, that is, the high load stage, according to the relationship between the first actual temperature upstream of the SCR and the set first temperature threshold, and the relationship between the second actual temperature upstream of the DOC and the set second temperature threshold; and by controlling part or all of the exhaust gas flowing out of the supercharger in the aftertreatment system to flow through the radiator in the heat dissipation system and then enter the DOC, the exhaust gas temperature in the aftertreatment system is reduced, thereby reducing the temperature of the exhaust gas entering the SCR and improving the conversion efficiency of the SCR for NO x conversion efficiency.

[0010] In a possible implementation manner, the control that all the exhaust gas flowing out of the supercharger in the aftertreatment system flows through the radiator in the heat dissipation system and then enters the DOC includes:

[0011] If the difference between the first actual temperature and the first temperature threshold is greater than or equal to the set threshold, then open the first flow valve in the heat dissipation system between the supercharger and the radiator, and close the second flow valve on the exhaust pipe line after the supercharger.

[0012] The technical solution provided by the embodiments of the present disclosure, under the working condition of a relatively high exhaust gas temperature of the engine, by opening the first flow valve and closing the second flow valve, enables all the exhaust gas flowing out of the supercharger in the aftertreatment system to flow through the radiator in the heat dissipation system and then enter the DOC, thereby quickly reducing the exhaust gas temperature in the aftertreatment system and improving the conversion efficiency of the SCR for NO x conversion efficiency.

[0013] In a possible implementation manner, the control that part of the exhaust gas flowing out of the supercharger in the aftertreatment system flows through the radiator in the heat dissipation system and then enters the DOC includes:

[0014] If the difference between the first actual temperature and the first temperature threshold is less than the set threshold, then determine the first opening degree according to the difference and the first corresponding relationship, and adjust the opening degree of the first flow valve in the heat dissipation system between the supercharger and the radiator to the first opening degree;

[0015] Determine the second opening degree according to the difference value and the second corresponding relationship, and adjust the opening degree of the second flow valve on the exhaust pipe after the supercharger to the second opening degree, where the first corresponding relationship is the corresponding relationship between each difference value and the opening degree of each first flow valve, and the second corresponding relationship is the corresponding relationship between each difference value and the opening degree of each second flow valve.

[0016] The technical solution provided by the embodiments of the present disclosure, under the condition of a relatively high exhaust temperature of the engine, by controlling the opening degrees of the first flow valve and the second flow valve, so that a part of the exhaust flowing out of the supercharger in the aftertreatment system flows through the radiator in the heat dissipation system, and another part of the exhaust flows through the exhaust pipe, and then enters the DOC, so that the temperature of the mixed exhaust meets the temperature requirement for the catalyst to work in the SCR, and improves the conversion efficiency of NO x in the SCR.

[0017] In a possible implementation manner, the radiator is an air-cooled system or a water-cooled system.

[0018] In a possible implementation manner, after controlling a part or all of the exhaust flowing out of the supercharger in the aftertreatment system to flow through the radiator in the heat dissipation system and then enter the DOC, it further includes:

[0019] Obtain in real time the first temperature measured by the sensor on the exhaust pipe upstream of the SCR in the aftertreatment system, and the second temperature measured by the sensor on the exhaust pipe upstream of the DOC in the aftertreatment system;

[0020] If the first temperature is less than or equal to the first temperature threshold, control the exhaust flowing out of the supercharger in the aftertreatment system to flow through the exhaust pipe and enter the DOC; or,

[0021] If the first temperature is greater than the first temperature threshold and the second temperature is less than or equal to the second temperature threshold, control the exhaust flowing out of the supercharger in the aftertreatment system to flow through the exhaust pipe and enter the DOC.

[0022] The technical solution provided by the embodiments of the present disclosure, by obtaining in real time the first temperature upstream of the SCR and the second temperature upstream of the DOC, and according to the relationship between the first temperature and the first temperature threshold, and the relationship between the second temperature and the second temperature threshold, determine that the engine changes from the high-load stage to the medium-low load stage; by controlling the exhaust flowing out of the supercharger in the aftertreatment system to flow through the exhaust pipe and enter the DOC, so that in the case of the engine changing from the high-load stage to the medium-low load stage, ensure that the temperature of the exhaust entering the SCR is within the temperature range capable of efficiently converting NO x in the SCR, and achieve a relatively high conversion efficiency of the SCR under more working conditions.

[0023] In a possible implementation, controlling the exhaust gas flowing out of the supercharger in the post-treatment system to flow into the DOC through the exhaust pipe includes:

[0024] Opening a second flow valve on the exhaust pipe located after the supercharger;

[0025] Closing a first flow valve in the heat dissipation system between the supercharger and the radiator to prevent the exhaust gas flowing out of the supercharger in the post-treatment system from flowing through the radiator in the heat dissipation system and into the DOC.

[0026] The technical solution provided by the embodiments of the present disclosure, when the engine transitions from a high-load stage to a medium-low load stage, by controlling the opening and closing of the first flow valve and the second flow valve, enables the exhaust gas flowing out of the supercharger in the post-treatment system to flow into the DOC through the exhaust pipe, ensuring that the temperature of the exhaust gas entering the SCR is within the temperature range capable of efficiently converting NO x to achieve a high conversion efficiency of the SCR under more working conditions.

[0027] In a possible implementation, after obtaining the first actual temperature measured by a sensor on the exhaust pipe upstream of the SCR in the post-treatment system and the second actual temperature measured by a sensor on the exhaust pipe upstream of the DOC in the post-treatment system, it further includes:

[0028] If the first actual temperature is less than or equal to the first temperature threshold, keep the exhaust gas flowing out of the supercharger in the post-treatment system flowing into the DOC through the exhaust pipe unchanged;

[0029] Alternatively, if the first actual temperature is greater than the first temperature threshold and the second actual temperature is less than or equal to the second temperature threshold, keep the exhaust gas flowing out of the supercharger in the post-treatment system flowing into the DOC through the exhaust pipe unchanged.

[0030] The technical solution provided by the embodiments of the present disclosure determines that the engine is in the starting stage or the medium-low load stage based on the relationship between the first actual temperature upstream of the SCR and the first temperature threshold, and the relationship between the second actual temperature upstream of the DOC and the second temperature threshold; by controlling the exhaust gas flowing out of the supercharger in the post-treatment system to flow into the DOC through the exhaust pipe, thereby ensuring that the temperature of the exhaust gas entering the SCR is within the temperature range capable of efficiently converting NO x to achieve a high conversion efficiency of the SCR under more working conditions.

[0031] According to a second aspect of the embodiments of the present disclosure, there is provided a control device for a post-treatment system, the device comprising:

[0032] An acquisition module, configured to acquire a first actual temperature measured by a sensor on the exhaust pipe upstream of the SCR in the post-treatment system, and a second actual temperature measured by a sensor on the exhaust pipe upstream of the DOC in the post-treatment system;

[0033] A control module, configured to, if the first actual temperature is greater than a set first temperature threshold and the second actual temperature is greater than a set second temperature threshold, control some or all of the exhaust gas flowing out of the supercharger in the post-treatment system to enter the DOC after flowing through a radiator in the heat dissipation system; wherein, the first temperature threshold is greater than the second temperature threshold.

[0034] In a possible implementation manner, the control module is configured to:

[0035] If the difference between the first actual temperature and the first temperature threshold is greater than or equal to a set threshold, open a first flow valve in the heat dissipation system between the supercharger and the radiator, and close a second flow valve on the exhaust pipe after the supercharger.

[0036] In a possible implementation manner, the control module is configured to:

[0037] If the difference between the first actual temperature and the first temperature threshold is less than the set threshold, determine a first opening degree according to the difference and a first correspondence relationship, and adjust the opening degree of the first flow valve in the heat dissipation system between the supercharger and the radiator to the first opening degree;

[0038] Determine a second opening degree according to the difference and a second correspondence relationship, and adjust the opening degree of the second flow valve on the exhaust pipe after the supercharger to the second opening degree, wherein, the first correspondence relationship is the correspondence relationship between each difference and each opening degree of the first flow valve, and the second correspondence relationship is the correspondence relationship between each difference and each opening degree of the second flow valve.

[0039] In a possible implementation manner, the radiator is an air-cooled system or a water-cooled system.

[0040] In a possible implementation manner, after controlling some or all of the exhaust gas flowing out of the supercharger in the post-treatment system to enter the DOC after flowing through a radiator in the heat dissipation system, the control module is further configured to:

[0041] Obtain in real time the first temperature measured by a sensor on the exhaust pipe upstream of the SCR in the aftertreatment system, and the second temperature measured by a sensor on the exhaust pipe upstream of the DOC in the aftertreatment system;

[0042] If the first temperature is less than or equal to the first temperature threshold, control the exhaust gas flowing out of the supercharger in the aftertreatment system to flow through the exhaust pipe and enter the DOC; or,

[0043] If the first temperature is greater than the first temperature threshold and the second temperature is less than or equal to the second temperature threshold, control the exhaust gas flowing out of the supercharger in the aftertreatment system to flow through the exhaust pipe and enter the DOC.

[0044] In a possible implementation, the control module is configured to:

[0045] Open a second flow valve on the exhaust pipe after the supercharger;

[0046] Close a first flow valve in the heat dissipation system between the supercharger and the radiator to prevent the exhaust gas flowing out of the supercharger in the aftertreatment system from flowing through the radiator in the heat dissipation system and entering the DOC.

[0047] In a possible implementation, after obtaining the first actual temperature measured by a sensor on the exhaust pipe upstream of the SCR in the aftertreatment system and the second actual temperature measured by a sensor on the exhaust pipe upstream of the DOC in the aftertreatment system, the obtaining module is further configured to:

[0048] If the first actual temperature is less than or equal to the first temperature threshold, keep the exhaust gas flowing out of the supercharger in the aftertreatment system flowing through the exhaust pipe and entering the DOC unchanged;

[0049] Or, if the first actual temperature is greater than the first temperature threshold and the second actual temperature is less than or equal to the second temperature threshold, keep the exhaust gas flowing out of the supercharger in the aftertreatment system flowing through the exhaust pipe and entering the DOC unchanged.

[0050] According to a third aspect of the embodiments of the present disclosure, there is provided a device, including: a processor; a memory for storing processor-executable instructions; wherein, the processor runs the executable instructions to implement the steps of the control method of the above-mentioned aftertreatment system.

[0051] According to a fourth aspect of the embodiments of the present disclosure, there is provided a computer-readable storage medium, on which computer instructions are stored, and when the instructions are executed by a processor, the steps of the control method of the above-mentioned aftertreatment system are implemented. Description of the Drawings

[0052] To more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0053] Figure 1 is a layout diagram of an existing engine after-treatment system shown according to an exemplary embodiment;

[0054] Figure 2 is a schematic diagram of an application scenario shown according to an exemplary embodiment;

[0055] Figure 3 is a flowchart of a control method for an after-treatment system shown according to an exemplary embodiment;

[0056] Figure 4 is a specific flowchart of a control method for an after-treatment system shown according to an exemplary embodiment;

[0057] Figure 5 is a specific flowchart of a control method for an after-treatment system shown according to an exemplary embodiment;

[0058] Figure 6 is a schematic diagram of an engine after-treatment system shown according to an exemplary embodiment;

[0059] Figure 7 is a schematic diagram of another engine after-treatment system shown according to an exemplary embodiment;

[0060] Figure 8 is a schematic diagram of a control device for an after-treatment system shown according to an exemplary embodiment;

[0061] Figure 9 is a schematic diagram of an electronic device for a control method of an after-treatment system shown according to an exemplary embodiment;

[0062] Figure 10 is a schematic diagram of a program product for a control method of an after-treatment system shown according to an exemplary embodiment. Detailed implementation manners

[0063] To make the objectives, technical solutions, and advantages of the present disclosure clearer, the present disclosure will be further described in detail below with reference to the accompanying drawings. Apparently, the described embodiments are only a part rather than all of the embodiments of the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present disclosure without creative efforts shall fall within the protection scope of the present disclosure.

[0064] Some terms appearing in the text are explained below:

[0065] 1. In the embodiments of the present disclosure, the term "and / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after.

[0066] 2. Terms such as "first" and "second" in the description, claims, and the above-mentioned drawings of the present disclosure are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present disclosure described here can be implemented in an order other than those illustrated or described here.

[0067] The application scenarios described in the embodiments of the present disclosure are for more clearly illustrating the technical solutions of the embodiments of the present disclosure and do not constitute a limitation on the technical solutions provided by the embodiments of the present disclosure. Those of ordinary skill in the art know that with the emergence of new application scenarios, the technical solutions provided by the embodiments of the present disclosure are equally applicable to similar technical problems. Among them, in the description of the present disclosure, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0068] Currently, vehicles generally use a post-treatment system to reduce NO in the engine exhaust x and particulate matter so that the exhaust gas emitted by the vehicle meets certain requirements.

[0069] Figure 1 is the layout diagram of the existing engine post-treatment system in the embodiments of the present disclosure. As Figure 1 shown, the exhaust gas after the TC (Turbine Charger) passes through the HC injection device 11, DOC, DPF, mixer, urea injection device 12, SCR, and ASC and then is discharged. The function of the DOC is to oxidize HC, CO, and NO in the engine exhaust and increase the exhaust gas temperature. The DPF relies on the filter material to capture the particulate matter in the exhaust gas. Since it will be blocked after long-term use, it needs to be regenerated and cleaned regularly. The function of the SCR is to remove NO in the exhaust gas x, using urea injected by the urea injection device 12 as a reducing agent, reacts with NO under the action of a selective catalyst x to N2 and H2O.

[0070] During the operation of the engine, due to the large operating temperature range of the SCR, it may cause the conversion efficiency of the SCR for NO x to be very low under certain working conditions, and then make the NO x emission too high.

[0071] Therefore, to solve the above problems, the present disclosure provides a control method, device, equipment and medium for a post-treatment system, which can reduce the temperature of the engine exhaust in the SCR and enable the SCR to have a higher conversion efficiency for NO x under more working conditions.

[0072] First, refer to Figure 2 , which is a schematic diagram of the application scenario of the embodiment of the present disclosure, including a post-treatment system 21 and an electronic control unit (ECU) 22. Among them, the post-treatment system 21 is used to send the first actual temperature upstream of the SCR and the second actual temperature upstream of the DOC to the electronic control unit 22; the electronic control unit 22 is used to control the exhaust gas flowing out of the supercharger in the post-treatment system 21 based on the first actual temperature and the second actual temperature sent by the post-treatment system 21.

[0073] In the embodiment of the present disclosure, as an optional implementation manner, the electronic control unit 22 obtains the first actual temperature measured by a sensor on the exhaust pipe upstream of the SCR in the post-treatment system 21, and the second actual temperature measured by a sensor on the exhaust pipe upstream of the DOC in the post-treatment system 21; if the first actual temperature is greater than the set first temperature threshold and the second actual temperature is greater than the set second temperature threshold, then control part or all of the exhaust gas flowing out of the supercharger in the post-treatment system 21 to flow through the radiator in the heat dissipation system and then enter the DOC; where the first temperature threshold is greater than the second temperature threshold.

[0074] In some embodiments, the following uses specific embodiments to illustrate a control method for a post-treatment system provided by the present disclosure, as Figure 3 shown, including:

[0075] Step 301, obtain the first actual temperature measured by a sensor on the exhaust pipe upstream of the SCR in the post-treatment system, and the second actual temperature measured by a sensor on the exhaust pipe upstream of the DOC in the post-treatment system;

[0076] The above-mentioned first temperature is detected by installing a temperature sensor on the exhaust pipe at the inlet of the SCR and using this temperature sensor; the above-mentioned second temperature is detected by installing a temperature sensor on the exhaust pipe at the inlet of the DOC and using this temperature sensor.

[0077] Step 302, if the first actual temperature is greater than the set first temperature threshold and the second actual temperature is greater than the set second temperature threshold, then control part or all of the exhaust gas flowing out of the supercharger in the aftertreatment system to flow through the radiator in the heat dissipation system and then enter the DOC.

[0078] Wherein, the first temperature threshold is greater than the second temperature threshold. The radiator is an air-cooled system or a water-cooled system.

[0079] The above-mentioned first temperature threshold is determined according to the highest conversion efficiency range of SCR for NO x For example, when the temperature upstream of the SCR is within the temperature range [250°C to 500°C], NO x has a relatively high conversion efficiency, then the first temperature threshold can be set to any value within this temperature range.

[0080] The above-mentioned second temperature threshold can be set by itself according to the actual situation.

[0081] The technical solution provided by the embodiment of the present disclosure determines that the engine is in a working condition with a relatively high exhaust gas temperature, that is, the high load stage, according to the relationship between the first actual temperature upstream of the SCR and the set first temperature threshold, and the relationship between the second actual temperature upstream of the DOC and the set second temperature threshold; and by controlling part or all of the exhaust gas flowing out of the supercharger in the aftertreatment system to flow through the radiator in the heat dissipation system and then enter the DOC, the exhaust gas temperature in the aftertreatment system is reduced, thereby reducing the temperature of the exhaust gas entering the SCR and improving the conversion efficiency of SCR for NO x conversion efficiency.

[0082] The following details the specific steps of the control method of the above-mentioned aftertreatment system, as Figure 4 shown, including:

[0083] Step 401, obtain the first actual temperature measured by the sensor on the exhaust pipe upstream of the SCR in the aftertreatment system, and the second actual temperature measured by the sensor on the exhaust pipe upstream of the DOC in the aftertreatment system;

[0084] Step 402, determine whether the first actual temperature is greater than the first temperature threshold. If it is greater, execute Step 403; otherwise, execute Step 405;

[0085] Step 403: Determine whether the second actual temperature is greater than the second temperature threshold. If it is greater, execute Step 404; otherwise, execute Step 405.

[0086] Step 404: Control part or all of the exhaust gas flowing out of the supercharger in the aftertreatment system to enter the DOC after passing through the radiator in the heat dissipation system.

[0087] The control in Step 404 above, where all the exhaust gas flowing out of the supercharger in the aftertreatment system enters the DOC after passing through the radiator in the heat dissipation system, includes:

[0088] If the difference between the first actual temperature and the first temperature threshold is greater than or equal to the set threshold, open the first flow valve in the heat dissipation system between the supercharger and the radiator, and close the second flow valve on the exhaust pipe after the supercharger.

[0089] Among them, the above set threshold can be set according to the actual situation. The opening of the first flow valve can be adjusted to the maximum or adjusted according to the actual situation.

[0090] In the working condition where the exhaust temperature of the engine in the present disclosure is relatively high, by opening the first flow valve and closing the second flow valve, all the exhaust gas flowing out of the supercharger in the aftertreatment system enters the DOC after passing through the radiator in the heat dissipation system, thereby quickly reducing the exhaust temperature in the aftertreatment system and improving the conversion efficiency of SCR for NO x conversion.

[0091] The control in Step 404 above, where part of the exhaust gas flowing out of the supercharger in the aftertreatment system enters the DOC after passing through the radiator in the heat dissipation system, includes:

[0092] If the difference between the first actual temperature and the first temperature threshold is less than the set threshold, determine the first opening according to the difference and the first corresponding relationship, and adjust the opening of the first flow valve in the heat dissipation system between the supercharger and the radiator to the first opening;

[0093] Determine the second opening according to the difference and the second corresponding relationship, and adjust the opening of the second flow valve on the exhaust pipe after the supercharger to the second opening;

[0094] Among them, the first corresponding relationship is the corresponding relationship between each difference and the opening of each first flow valve, and the second corresponding relationship is the corresponding relationship between each difference and the opening of each second flow valve.

[0095] The difference between the first actual temperature and the first temperature threshold is positively correlated with the opening degree of the first flow valve, that is, the greater the difference between the first actual temperature and the first temperature threshold, the greater the opening degree of the first flow valve, so that the flow rate of the exhaust gas flowing through the radiator in the heat dissipation system is greater. Correspondingly, the smaller the difference between the first actual temperature and the first temperature threshold, the smaller the opening degree of the first flow valve, so that the flow rate of the exhaust gas flowing through the radiator in the heat dissipation system is smaller.

[0096] The difference between the first actual temperature and the first temperature threshold is negatively correlated with the opening degree of the second flow valve, that is, the greater the difference between the first actual temperature and the first temperature threshold, the smaller the opening degree of the second flow valve, so that the flow rate of the exhaust gas flowing through the radiator in the heat dissipation system is greater. Correspondingly, the smaller the difference between the first actual temperature and the first temperature threshold, the smaller the opening degree of the first flow valve, so that the flow rate of the exhaust gas flowing through the exhaust pipe is smaller.

[0097] Under the condition of high exhaust temperature of the engine, the present disclosure controls the opening degrees of the first flow valve and the second flow valve, so that a part of the exhaust gas flowing out of the supercharger in the aftertreatment system flows through the radiator in the heat dissipation system and then enters the DOC, while another part of the exhaust gas flows through the exhaust pipe and then enters the DOC. That is, by adjusting the opening degrees of the flow valves, part of the exhaust gas flows into the heat dissipation system, and another part flows into the exhaust pipe and converges in front of the DOC, so that the temperature of the mixed exhaust gas meets the temperature requirement for the catalyst to work in the SCR, and the conversion efficiency of NO in the SCR is improved. x in the conversion efficiency.

[0098] After step 404, the present disclosure controls the aftertreatment system by the following method, as Figure 5 shown, including:

[0099] Step 501, obtain in real time the first temperature measured by the sensor on the exhaust pipe upstream of the SCR in the aftertreatment system, and the second temperature measured by the sensor on the exhaust pipe upstream of the DOC in the aftertreatment system;

[0100] Step 502, determine whether the first temperature is greater than the first temperature threshold. If it is greater, execute step 503; otherwise, execute step 505;

[0101] Step 503, determine whether the second temperature is greater than the second temperature threshold. If it is greater, execute step 504; otherwise, execute step 505;

[0102] Step 504, control part or all of the exhaust gas flowing out of the supercharger in the aftertreatment system to flow through the radiator in the heat dissipation system and then enter the DOC;

[0103] The above step 504 specifically includes the following situations:

[0104] In the first case, if the difference between the first temperature and the first temperature threshold is greater than or equal to the set threshold, adjust the opening of the first flow valve and close the second flow valve on the exhaust pipe after the supercharger.

[0105] In the second case, if the difference between the first temperature and the first temperature threshold is less than the set threshold, determine the third opening according to the difference and the first correspondence, and adjust the opening of the first flow valve in the heat dissipation system between the supercharger and the radiator to the third opening.

[0106] Determine the fourth opening according to the difference and the second correspondence, and adjust the opening of the second flow valve on the exhaust pipe after the supercharger to the fourth opening.

[0107] Step 505: Control the exhaust gas flowing out of the supercharger in the aftertreatment system to enter the DOC through the exhaust pipe.

[0108] The above step 505 specifically includes:

[0109] Open the second flow valve on the exhaust pipe after the supercharger.

[0110] Close the first flow valve in the heat dissipation system between the supercharger and the radiator to prevent the exhaust gas flowing out of the supercharger in the aftertreatment system from entering the DOC through the radiator in the heat dissipation system.

[0111] Step 405: Keep the exhaust gas flowing out of the supercharger in the aftertreatment system entering the DOC through the exhaust pipe unchanged.

[0112] After step 405, the present disclosure obtains in real time the first temperature measured by the sensor on the exhaust pipe upstream of the SCR in the aftertreatment system and the second temperature measured by the sensor on the exhaust pipe upstream of the DOC in the aftertreatment system; when the first temperature is greater than the first temperature threshold and the second temperature is greater than the second temperature threshold, control part or all of the exhaust gas flowing out of the supercharger in the aftertreatment system to enter the DOC after flowing through the radiator in the heat dissipation system; when the first temperature is less than or equal to the first temperature threshold, or the first temperature is greater than the first temperature threshold and the second temperature is less than or equal to the second temperature threshold, keep the exhaust gas flowing out of the supercharger in the aftertreatment system entering the DOC through the exhaust pipe unchanged. The specific control process is as described above and will not be elaborated here.

[0113] Figure 6 This is a schematic diagram of an engine aftertreatment system in an embodiment of the present disclosure, as Figure 6As shown in the figure, the post-treatment system includes a TC601, a radiator 604, a DOC606, a DPF607, an SCR609, and an ASC610. The exhaust gas is discharged after passing through the TC601, DOC606, DPF607, SCR609, and ASC610. There is an exhaust pipe between the TC601 and the DOC606, and a second flow valve 603 is provided on the exhaust pipe. A temperature sensor 605 is provided upstream of the DOC606, and a temperature sensor 608 is provided upstream of the SCR609. A heat dissipation system is provided between the TC601 and the DOC606. The heat dissipation system includes a first flow valve 602 and a radiator 604. Among them, the radiator can be an air-cooled system, a water-cooled system, etc. Its specific structure is the prior art and will not be elaborated here.

[0114] Based on Figure 6 the post-treatment system in

[0115] Obtain the first actual temperature T1 measured by the temperature sensor 608 and the second actual temperature T2 measured by the temperature sensor 605.

[0116] If the first actual temperature T1 is greater than the set first temperature threshold Ta and the second actual temperature T2 is greater than the set second temperature threshold Tb, then judge the relationship between the difference ΔT between the first actual temperature and the first temperature threshold and the set threshold Tc. If the difference ΔT is greater than or equal to the set threshold Tc, open the first flow valve 602 and close the second flow valve 603 so that all the exhaust gas flowing out of the TC601 in the post-treatment system passes through the radiator 604 in the heat dissipation system and then enters the DOC606. If the difference ΔT is less than the set threshold Tc, adjust the opening degree of the first flow valve 602 to the first opening degree determined according to the difference ΔT and the first corresponding relationship, and adjust the opening degree of the second flow valve 603 to the second opening degree determined according to the difference ΔT and the second corresponding relationship, so that a part of the exhaust gas flowing out of the TC601 in the post-treatment system passes through the radiator 604 in the heat dissipation system, and the other part of the exhaust gas passes through the exhaust pipe and then enters the DOC606.

[0117] If the first actual temperature T1 is greater than the first temperature threshold Ta and the second actual temperature T2 is less than or equal to the second temperature threshold Tb, keep the second flow valve 603 in the open state and keep the first flow valve 602 in the closed state, so that the exhaust gas flowing out of the TC601 in the post-treatment system passes through the exhaust pipe between the TC601 and the DOC606 and enters the DOC606.

[0118] If the first actual temperature T1 is less than the first temperature threshold Ta, keep the second flow valve 603 open and keep the first flow valve 602 closed, so that the exhaust gas flowing out of TC601 in the aftertreatment system flows through the exhaust pipe between TC601 and DOC606 and enters DOC606.

[0119] Figure 7 is a schematic diagram of another engine aftertreatment system in an embodiment of the present disclosure, as Figure 7 shown, the aftertreatment system includes TC701, radiator 703, DOC705, DPF706, SCR708 and ASC709. The exhaust gas is discharged after passing through TC701, DOC705, DPF706, SCR708 and ASC709. There is an exhaust pipe between TC701 and DOC705, a temperature sensor 704 is arranged upstream of DOC705, and a temperature sensor 707 is arranged upstream of SCR708. A heat dissipation system is arranged between TC701 and DOC705, and the heat dissipation system includes a flow valve 702 and a radiator 703.

[0120] Based on Figure 7 the aftertreatment system in, the specific process of the control method of the above aftertreatment system is as follows:

[0121] Obtain the first actual temperature T3 measured by the temperature sensor 707 and the second actual temperature T4 measured by the temperature sensor 704.

[0122] If the first actual temperature T3 is greater than the set first temperature threshold Ta and the second actual temperature T4 is greater than the set second temperature threshold Tb, then judge the relationship between the difference ΔT between the first actual temperature and the first temperature threshold and the set threshold Tc. If the difference ΔT is greater than or equal to the set threshold Tc, open the flow valve 702 to the maximum, so that a larger part of the exhaust gas flowing out of TC701 in the aftertreatment system flows through the radiator 703 in the heat dissipation system, and the other part of the exhaust gas flows through the exhaust pipe and then enters DOC705. If the difference ΔT is less than the set threshold Tc, adjust the opening of the flow valve 702 to the first opening determined according to the difference ΔT and the first correspondence.

[0123] If the first actual temperature T3 is greater than the first temperature threshold Ta and the second actual temperature T4 is less than or equal to the second temperature threshold Tb, keep the flow valve 702 closed so that the exhaust gas flowing out of TC701 in the aftertreatment system flows through the exhaust pipe between TC701 and DOC705 and enters DOC705.

[0124] If the first actual temperature T3 is less than the first temperature threshold Ta, the closed state of the flow valve 702 is maintained so that the exhaust gas flowing out of the TC701 in the aftertreatment system flows through the exhaust pipe between the TC701 and the DOC705 and enters the DOC705.

[0125] In some embodiments, based on the same inventive concept, the embodiments of the present disclosure further provide a control device for an aftertreatment system. Since this device is the device in the method of the embodiments of the present disclosure, and the principle of solving problems by this device is similar to that of the method, the implementation of this device can refer to the implementation of the method, and the repeated parts will not be described again.

[0126] As Figure 8 shown, the above device includes the following modules:

[0127] An acquisition module 801, configured to acquire a first actual temperature measured by a sensor on the exhaust pipe upstream of the SCR in the aftertreatment system, and a second actual temperature measured by a sensor on the exhaust pipe upstream of the DOC in the aftertreatment system;

[0128] A control module 802, configured to control part or all of the exhaust gas flowing out of the supercharger in the aftertreatment system to flow through the radiator in the heat dissipation system and then enter the DOC if the first actual temperature is greater than a set first temperature threshold and the second actual temperature is greater than a set second temperature threshold; wherein, the first temperature threshold is greater than the second temperature threshold.

[0129] As an optional implementation manner, the control module 802 is configured to:

[0130] If the difference between the first actual temperature and the first temperature threshold is greater than or equal to a set threshold, open the first flow valve in the heat dissipation system between the supercharger and the radiator, and close the second flow valve on the exhaust pipe after the supercharger.

[0131] As an optional implementation manner, the control module 802 is configured to:

[0132] If the difference between the first actual temperature and the first temperature threshold is less than the set threshold, determine a first opening degree according to the difference and a first correspondence relationship, and adjust the opening degree of the first flow valve in the heat dissipation system between the supercharger and the radiator to the first opening degree;

[0133] Determine the second opening degree according to the difference value and the second corresponding relationship, and adjust the opening degree of the second flow valve on the exhaust pipe after the supercharger to the second opening degree, where the first corresponding relationship is the corresponding relationship between each difference value and the opening degree of each first flow valve, and the second corresponding relationship is the corresponding relationship between each difference value and the opening degree of each second flow valve.

[0134] As an alternative implementation, the radiator is an air-cooled system or a water-cooled system.

[0135] As an alternative implementation, after controlling a part or all of the exhaust gas flowing out of the supercharger in the aftertreatment system to flow through the radiator in the heat dissipation system and then enter the DOC, the control module 802 is further configured to:

[0136] Obtain in real time the first temperature measured by the sensor on the exhaust pipe upstream of the SCR in the aftertreatment system and the second temperature measured by the sensor on the exhaust pipe upstream of the DOC in the aftertreatment system;

[0137] If the first temperature is less than or equal to the first temperature threshold, control the exhaust gas flowing out of the supercharger in the aftertreatment system to flow through the exhaust pipe and enter the DOC; or,

[0138] If the first temperature is greater than the first temperature threshold and the second temperature is less than or equal to the second temperature threshold, control the exhaust gas flowing out of the supercharger in the aftertreatment system to flow through the exhaust pipe and enter the DOC.

[0139] As an alternative implementation, the control module 802 is configured to:

[0140] Open the second flow valve on the exhaust pipe after the supercharger;

[0141] Close the first flow valve in the heat dissipation system between the supercharger and the radiator to prohibit the exhaust gas flowing out of the supercharger in the aftertreatment system from flowing through the radiator in the heat dissipation system and entering the DOC.

[0142] As an alternative implementation, after obtaining the first actual temperature measured by the sensor on the exhaust pipe upstream of the SCR in the aftertreatment system and the second actual temperature measured by the sensor on the exhaust pipe upstream of the DOC in the aftertreatment system, the obtaining module 801 is further configured to:

[0143] If the first actual temperature is less than or equal to the first temperature threshold, keep the exhaust gas flowing out of the supercharger in the aftertreatment system flowing through the exhaust pipe and entering the DOC unchanged;

[0144] Alternatively, if the first actual temperature is greater than the first temperature threshold and the second actual temperature is less than or equal to the second temperature threshold, keep the exhaust gas flowing out of the supercharger in the aftertreatment system flowing through the exhaust pipe and into the DOC unchanged.

[0145] In some embodiments, based on the same inventive concept, embodiments of the present disclosure also provide a control device for an aftertreatment system. This device can implement the control functions of the aftertreatment system discussed above. Please refer to Figure 9 The device includes a processor 901 and a memory 902, where the memory 902 is used to store program instructions;

[0146] The processor 901 calls the program instructions stored in the memory and runs the program instructions to achieve:

[0147] Obtain the first actual temperature measured by a sensor on the exhaust pipe upstream of the SCR in the aftertreatment system and the second actual temperature measured by a sensor on the exhaust pipe upstream of the DOC in the aftertreatment system;

[0148] If the first actual temperature is greater than the set first temperature threshold and the second actual temperature is greater than the set second temperature threshold, control some or all of the exhaust gas flowing out of the supercharger in the aftertreatment system to flow through the radiator in the heat dissipation system and then into the DOC; where the first temperature threshold is greater than the second temperature threshold.

[0149] As an alternative implementation, controlling all of the exhaust gas flowing out of the supercharger in the aftertreatment system to flow through the radiator in the heat dissipation system and then into the DOC includes:

[0150] If the difference between the first actual temperature and the first temperature threshold is greater than or equal to the set threshold, open the first flow valve in the heat dissipation system between the supercharger and the radiator, and close the second flow valve on the exhaust pipe after the supercharger.

[0151] As an alternative implementation, controlling some of the exhaust gas flowing out of the supercharger in the aftertreatment system to flow through the radiator in the heat dissipation system and then into the DOC includes:

[0152] If the difference between the first actual temperature and the first temperature threshold is less than the set threshold, determine a first opening degree according to the difference and a first correspondence relationship, and adjust the opening degree of the first flow valve in the heat dissipation system between the supercharger and the radiator to the first opening degree;

[0153] Determine the second opening degree according to the difference value and the second corresponding relationship, and adjust the opening degree of the second flow valve on the exhaust pipe after the supercharger to the second opening degree, where the first corresponding relationship is the corresponding relationship between each difference value and the opening degree of each first flow valve, and the second corresponding relationship is the corresponding relationship between each difference value and the opening degree of each second flow valve.

[0154] As an alternative implementation, the radiator is an air-cooling system or a water-cooling system.

[0155] As an alternative implementation, after controlling a part or all of the exhaust gas flowing out of the supercharger in the aftertreatment system to flow through the radiator in the heat dissipation system and then enter the DOC, the processor 901 is further configured to:

[0156] Obtain in real time the first temperature measured by a sensor on the exhaust pipe upstream of the SCR in the aftertreatment system and the second temperature measured by a sensor on the exhaust pipe upstream of the DOC in the aftertreatment system;

[0157] If the first temperature is less than or equal to the first temperature threshold, control the exhaust gas flowing out of the supercharger in the aftertreatment system to flow through the exhaust pipe and enter the DOC; or,

[0158] If the first temperature is greater than the first temperature threshold and the second temperature is less than or equal to the second temperature threshold, control the exhaust gas flowing out of the supercharger in the aftertreatment system to flow through the exhaust pipe and enter the DOC.

[0159] As an alternative implementation, the controlling the exhaust gas flowing out of the supercharger in the aftertreatment system to flow through the exhaust pipe and enter the DOC includes:

[0160] Open the second flow valve on the exhaust pipe after the supercharger;

[0161] Close the first flow valve in the heat dissipation system between the supercharger and the radiator to prevent the exhaust gas flowing out of the supercharger in the aftertreatment system from flowing through the radiator in the heat dissipation system and entering the DOC.

[0162] As an alternative implementation, after obtaining the first actual temperature measured by a sensor on the exhaust pipe upstream of the SCR in the aftertreatment system and the second actual temperature measured by a sensor on the exhaust pipe upstream of the DOC in the aftertreatment system, the processor 901 is further configured to:

[0163] If the first actual temperature is less than or equal to the first temperature threshold, keep the exhaust gas flowing out of the supercharger in the aftertreatment system flowing through the exhaust pipe and entering the DOC unchanged;

[0164] Alternatively, if the first actual temperature is greater than the first temperature threshold and the second actual temperature is less than or equal to the second temperature threshold, then keep the exhaust gas flowing out of the supercharger in the aftertreatment system flowing through the exhaust pipe and into the DOC unchanged.

[0165] In some possible embodiments, various aspects of the present disclosure may also be implemented in the form of a program product, such as Figure 10 shown. The computer program product 101 includes computer program code that, when run on a computer, causes the computer to execute the control method of the aftertreatment system as described in any of the foregoing discussions. Since the principle of the above computer program product for solving problems is similar to that of the control method of the aftertreatment system, the implementation of the above computer program product may refer to the implementation of the method, and the repeated parts will not be elaborated.

[0166] Those skilled in the art should understand that the embodiments of the present disclosure may be provided as a method, a system, or a computer program product. Therefore, the present disclosure may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present disclosure may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) containing computer-usable program code.

[0167] The present disclosure is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to embodiments of the present disclosure. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of flows and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate a device for implementing the specified functions in Figure 1 one or more of the processes Figure 1 or multiple processes and / or blocks

[0168] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including an instruction device that implements the specified functions in Figure 1 one or more of the processes Figure 1 or multiple processes and / or blocks

[0169] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus, so that a series of operation steps are performed on the computer or other programmable apparatus to produce a computer-implemented process, thereby providing instructions for implementing the functions specified in one process or multiple processes and / or blocks Figure 1 one process or multiple processes and / or blocks Figure 1 steps for the functions specified in one block or multiple blocks.

[0170] Other embodiments of the present disclosure will be readily apparent to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common general knowledge or conventional technical means in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present disclosure are pointed out by the following claims.

[0171] It should be understood that the present disclosure is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present disclosure is only limited by the appended claims.

Claims

1. A control method for a post-processing system, characterized in that, The method includes: obtaining a first actual temperature measured by a sensor on an exhaust pipe upstream of a selective catalytic reduction (SCR) in a post-treatment system, and a second actual temperature measured by a sensor on an exhaust pipe upstream of a diesel oxidation catalyst (DOC) in the post-treatment system; if the first actual temperature is greater than a set first temperature threshold and the second actual temperature is greater than a set second temperature threshold, then controlling part or all of the exhaust gas flowing out of a supercharger in the post-treatment system to enter the DOC after flowing through a radiator in a heat dissipation system; wherein the first temperature threshold is greater than the second temperature threshold; wherein, controlling all of the exhaust gas flowing out of the supercharger in the post-treatment system to enter the DOC after flowing through the radiator in the heat dissipation system includes: if the difference between the first actual temperature and the first temperature threshold is greater than or equal to a set threshold, then opening a first flow valve in the heat dissipation system between the supercharger and the radiator, and closing a second flow valve on the exhaust pipe after the supercharger.

2. The method according to claim 1, wherein Controlling part of the exhaust gas flowing out of the supercharger in the post-treatment system to enter the DOC after flowing through the radiator in the heat dissipation system includes: if the difference between the first actual temperature and the first temperature threshold is less than the set threshold, then determining a first opening degree according to the difference and a first correspondence relationship, and adjusting the opening degree of the first flow valve in the heat dissipation system between the supercharger and the radiator to the first opening degree; determining a second opening degree according to the difference and a second correspondence relationship, and adjusting the opening degree of the second flow valve on the exhaust pipe after the supercharger to the second opening degree, wherein the first correspondence relationship is the correspondence relationship between each difference and each opening degree of the first flow valve, and the second correspondence relationship is the correspondence relationship between each difference and each opening degree of the second flow valve.

3. The method according to claim 1, wherein The radiator is an air-cooling system or a water-cooling system.

4. The method according to any one of claims 1-2, characterized in that, After controlling part or all of the exhaust gas flowing out of the supercharger in the post-treatment system to enter the DOC after flowing through the radiator in the heat dissipation system, it further includes: obtaining in real time a first temperature measured by a sensor on an exhaust pipe upstream of the SCR in the post-treatment system, and a second temperature measured by a sensor on an exhaust pipe upstream of the DOC in the post-treatment system; if the first temperature is less than or equal to the first temperature threshold, then controlling the exhaust gas flowing out of the supercharger in the post-treatment system to enter the DOC through the exhaust pipe; or, if the first temperature is greater than the first temperature threshold and the second temperature is less than or equal to the second temperature threshold, then controlling the exhaust gas flowing out of the supercharger in the post-treatment system to enter the DOC through the exhaust pipe.

5. The method according to claim 4, characterized in that, Controlling the exhaust gas flowing out of the supercharger in the post-treatment system to enter the DOC through the exhaust pipe includes: opening the second flow valve on the exhaust pipe after the supercharger; Close the first flow valve in the heat dissipation system located between the supercharger and the radiator to prevent the exhaust gas flowing out of the supercharger in the aftertreatment system from passing through the radiator in the heat dissipation system and entering the DOC.

6. The method according to claim 1, characterized in that, After obtaining the first actual temperature measured by a sensor on the exhaust pipe upstream of the SCR in the aftertreatment system and the second actual temperature measured by a sensor on the exhaust pipe upstream of the DOC in the aftertreatment system, it further includes: If the first actual temperature is less than or equal to the first temperature threshold, keep the exhaust gas flowing out of the supercharger in the aftertreatment system passing through the exhaust pipe and entering the DOC unchanged; Or, if the first actual temperature is greater than the first temperature threshold and the second actual temperature is less than or equal to the second temperature threshold, keep the exhaust gas flowing out of the supercharger in the aftertreatment system passing through the exhaust pipe and entering the DOC unchanged.

7. A control device for a post-processing system, characterized in that, The device includes: An acquisition module for acquiring the first actual temperature measured by a sensor on the exhaust pipe upstream of the selective catalytic reduction (SCR) in the aftertreatment system and the second actual temperature measured by a sensor on the exhaust pipe upstream of the diesel oxidation catalyst (DOC) in the aftertreatment system; A control module for, if the first actual temperature is greater than the set first temperature threshold and the second actual temperature is greater than the set second temperature threshold, controlling part or all of the exhaust gas flowing out of the supercharger in the aftertreatment system to pass through the radiator in the heat dissipation system and then enter the DOC; wherein the first temperature threshold is greater than the second temperature threshold; Wherein, the control module is used for: If the difference between the first actual temperature and the first temperature threshold is greater than or equal to the set threshold, open the first flow valve in the heat dissipation system between the supercharger and the radiator, and close the second flow valve on the exhaust pipe after the supercharger.

8. A device, characterized in that, It includes: A processor; A memory for storing instructions executable by the processor; wherein, the processor realizes the steps of the method according to any one of claims 1 to 6 by running the executable instructions.

9. A computer-readable and writable storage medium, on which computer instructions are stored, characterized in that, When the instruction is executed by the processor, it realizes the steps of the method according to any one of claims 1 to 6.

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