A method, device and medium for controlling fuel injection quantity of an engine

Abstract

The present disclosure relates to a method, device and medium for controlling fuel injection amount of an engine, the method comprising: detecting that DPF needs to be regenerated; obtaining a first temperature measured by a sensor upstream of the DPF of each branch in an aftertreatment system, wherein the aftertreatment system comprises a plurality of branches; for each branch, performing closed-loop control on a regeneration temperature according to a set DPF upstream temperature and the first temperature of the branch, and determining a first fuel injection amount of the branch according to a closed-loop control result; determining a required fuel injection amount of the branch according to the first fuel injection amount, a second fuel injection amount and a fuel injection boundary value of the branch; and controlling an HC injection device to inject fuel into a DOC in each branch based on the required fuel injection amount of each branch. The present disclosure can reduce the carrier cracking, melting and other situations caused by uneven injection of oil gas flow into the DOC during the regeneration process in the prior art.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of engine aftertreatment technology, and particularly relates to a control method and device for engine fuel injection quantity and a medium. BACKGROUND

[0002] At present, with the upgrading of engine emission technology, DPF (Diesel Particulate Filter) technology is adopted to filter out most of the soot and other particulate matters in exhaust gas, effectively reducing the emission of particulate matters.

[0003] However, with the increase of engine running time, the carbon particles captured by the DPF increase, which may cause the exhaust back pressure of the engine to become larger, the in-cylinder combustion to deteriorate, the fuel consumption and the emission to become worse, and the power and fuel economy of the engine to be affected. Therefore, when the carbon particles accumulate to a certain amount, the DPF needs to be actively regenerated periodically. During the regeneration process, the engine sprays fuel, for example, HC (Hydrocarbon), through in-cylinder post-injection or tailpipe post-injection, and the fuel is oxidized and releases heat in the DOC (Diesel Oxidation Catalysis), generating high temperature to oxidize and burn the soot at high temperature, thereby restoring the function of the DPF.

[0004] However, due to the uneven fuel injection flow into the DOC during the regeneration process, a high temperature may occur inside the DPF, which may further cause the carrier to crack and melt. SUMMARY

[0005] The present disclosure provides a control method and device for engine fuel injection quantity and a medium, which can reduce the carrier cracking and melting caused by the uneven fuel injection flow into the DOC during the regeneration process in the prior art.

[0006] According to a first aspect of an embodiment of the present disclosure, a control method for engine fuel injection quantity is provided, which comprises:

[0007] detecting that the DPF needs to be regenerated, and acquiring a first temperature measured by a sensor upstream of the DPF in each branch of an aftertreatment system, wherein the aftertreatment system comprises a plurality of branches, each branch comprising a DOC, a sensor and a DPF;

[0008] For each branch, a closed-loop control is performed on the regeneration temperature according to a set DPF upstream temperature and a first temperature of the branch, and a first injection amount of the branch is determined according to a closed-loop control result; wherein the set DPF upstream temperature is determined according to a second temperature measured by a sensor on an exhaust pipe upstream of a DOC in the aftertreatment system, an exhaust mass flow, and a first corresponding relationship, and the first corresponding relationship is a corresponding relationship between each second temperature, each exhaust mass flow, and each DPF upstream temperature;

[0009] According to the first injection amount, a second injection amount, and an injection boundary value of the branch, a required injection amount of the branch is determined, wherein the second injection amount is determined based on the second temperature, a heat value of unit fuel combustion, and the exhaust mass flow;

[0010] Based on the required injection amount of each branch, an HC injection device is controlled to inject fuel into the DOC in each branch.

[0011] The technical solution provided by the embodiments of the present disclosure is that, in an aftertreatment system with multiple branches, for each branch, a closed-loop control is performed on the regeneration temperature according to a set DPF upstream temperature and a first temperature of the branch measured by a sensor upstream of the DPF of the branch, and a first injection amount of the branch is determined according to a closed-loop control result; according to the first injection amount, a second injection amount, and an injection boundary value of the branch, a required injection amount of each branch is determined. Furthermore, based on the required injection amount of each branch, an HC injection device is controlled to inject fuel into the DOC in each branch, so that the accurate control of the injection amount of each branch is realized, and the situations such as carrier cracking and melting caused by the non-uniform injection of fuel gas into the DOC during the regeneration process in the prior art are reduced, thereby improving the reliability of the regeneration of the DPF.

[0012] In a possible implementation, the second injection amount is determined based on the second temperature, a heat value of unit fuel combustion, and the exhaust mass flow, and the determination includes:

[0013] Based on the second temperature, a heat capacity of exhaust gas, and the exhaust mass flow, a heat value required for regeneration is determined, wherein the heat capacity of the exhaust gas is determined according to the second temperature and a second corresponding relationship, and the second corresponding relationship is a corresponding relationship between each second temperature and each heat capacity of exhaust gas;

[0014] Based on the heat value, a heat value of unit fuel combustion, and an HC conversion efficiency, the second injection amount is determined, wherein the HC conversion efficiency is determined according to the second temperature, the exhaust mass flow, and a third corresponding relationship, and the third corresponding relationship is a corresponding relationship between each second temperature, each exhaust mass flow, and each HC conversion efficiency.

[0015] In a possible implementation, the determining of the heat value required for regeneration based on the second temperature, the heat capacity of the exhaust gas and the exhaust gas mass flow comprises:

[0016] determining a temperature difference between a set temperature and the second temperature, wherein the set temperature is greater than the second temperature;

[0017] multiplying the determined temperature difference, the heat capacity of the exhaust gas and the exhaust gas mass flow to obtain the heat value.

[0018] In a possible implementation, the determining of the second fuel injection amount based on the heat value, the heat value per unit fuel combustion and the HC conversion efficiency comprises:

[0019] determining a first ratio of the heat value to the heat value per unit fuel combustion;

[0020] multiplying the determined first ratio and a second ratio of the HC conversion efficiency to obtain the second fuel injection amount.

[0021] In a possible implementation, the determining of the fuel injection amount required for each branch based on the first fuel injection amount, the second fuel injection amount and the fuel injection boundary value of the branch comprises:

[0022] if the sum of the first fuel injection amount and the second fuel injection amount of the branch is less than the fuel injection boundary value, the sum is taken as the fuel injection amount required for the branch;

[0023] if the sum of the first fuel injection amount and the second fuel injection amount of the branch is greater than or equal to the fuel injection boundary value, the fuel injection boundary value is taken as the fuel injection amount required for the branch.

[0024] The technical scheme provided by the embodiments of the present disclosure takes the minimum value of the sum of the first fuel injection amount and the second fuel injection amount of each branch of the aftertreatment system and the fuel injection boundary value as the main fuel injection amount of the branch, so that the fuel injection amount of the HC injection device to the DOC in each branch is within the fuel injection boundary value, which can reduce the carrier cracking and melting caused by the non-uniform injection of oil gas flow to the DOC during regeneration in the prior art, and improve the reliability of DPF regeneration.

[0025] In a possible implementation, the controlling of the HC injection device to inject fuel into the DOC in each branch comprises:

[0026] if the aftertreatment system comprises two branches, a third temperature measured by a sensor upstream of the DPF in the first branch of the aftertreatment system and a fourth temperature measured by a sensor upstream of the DPF in the second branch are acquired in real time;

[0027] control an injection amount of the HC injection device to the DOC in the two branches based on a relationship between the third temperature and the fourth temperature.

[0028] The technical solution provided by the embodiments of the present disclosure is that, for an aftertreatment system with two branches, an injection amount of an HC injection device to a DOC in the two branches is controlled based on a relationship between a temperature measured by a sensor upstream of a DPF in a first branch and a temperature measured by a sensor upstream of a DPF in a second branch, so that fuel injected by the HC injection device to the DOC in the two branches is more uniform, and thus a DPF active regeneration process is controlled and the reliability of DPF regeneration is improved.

[0029] In a possible implementation, the control of the injection amount of the HC injection device to the DOC in the two branches based on the relationship between the third temperature and the fourth temperature includes:

[0030] if the third temperature is greater than the fourth temperature, the injection amount of the HC injection device to the DOC in the first branch is reduced, and the injection amount of the HC injection device to the DOC in the second branch is increased;

[0031] if the third temperature is less than the fourth temperature, the injection amount of the HC injection device to the DOC in the first branch is increased, and the injection amount of the HC injection device to the DOC in the second branch is reduced;

[0032] if the third temperature is equal to the fourth temperature, the injection amount of the HC injection device to the DOC in each branch is kept unchanged.

[0033] The technical solution provided by the embodiments of the present disclosure is that, for an aftertreatment system with two branches, an injection amount of an HC injection device to a DOC in the two branches is controlled based on a relationship between a temperature measured by a sensor upstream of a DPF in a first branch and a temperature measured by a sensor upstream of a DPF in a second branch, so that fuel injected by the HC injection device to the DOC in the two branches is more uniform, and thus a DPF active regeneration process is controlled and the reliability of DPF regeneration is improved.

[0034] According to a second aspect of the embodiments of the present disclosure, a device for controlling an injection amount of an engine is provided, and the device includes:

[0035] an acquisition module configured to detect that a DPF needs to be regenerated, and acquire a first temperature measured by a sensor upstream of the DPF in each branch of an aftertreatment system, wherein the aftertreatment system includes a plurality of branches, and each branch includes a DOC, a sensor, and a DPF;

[0036] The first determining module is configured to: for each branch, perform closed-loop control on a regeneration temperature according to a set DPF upstream temperature and a first temperature of the branch, and determine a first fuel injection amount of the branch according to a closed-loop control result; wherein the set DPF upstream temperature is determined according to a second temperature measured by a sensor on an exhaust pipe upstream of a DOC in the aftertreatment system, an exhaust mass flow, and a first correspondence relationship, and the first correspondence relationship is a correspondence relationship between each second temperature, each exhaust mass flow, and each DPF upstream temperature.

[0037] The second determining module is configured to determine a required fuel injection amount of the branch according to the first fuel injection amount, a second fuel injection amount, and a fuel injection boundary value, wherein the second fuel injection amount is determined based on the second temperature, a heat value of unit fuel combustion, and the exhaust mass flow.

[0038] The control module is configured to control the HC injection device to inject fuel into the DOC in each branch based on the required fuel injection amount of each branch.

[0039] In a possible implementation, the first determining module is configured to:

[0040] determine a heat value required for regeneration based on the second temperature, a heat capacity of exhaust gas, and the exhaust mass flow, wherein the heat capacity of the exhaust gas is determined according to the second temperature and a second correspondence relationship, and the second correspondence relationship is a correspondence relationship between each second temperature and each heat capacity of exhaust gas;

[0041] determine the second fuel injection amount based on the heat value, the heat value of unit fuel combustion, and an HC conversion efficiency, wherein the HC conversion efficiency is determined according to the second temperature, the exhaust mass flow, and a third correspondence relationship, and the third correspondence relationship is a correspondence relationship between each second temperature, each exhaust mass flow, and each HC conversion efficiency.

[0042] In a possible implementation, the first determining module is configured to:

[0043] determine a temperature difference value between a set temperature and the second temperature, wherein the set temperature is greater than the second temperature;

[0044] multiply the determined temperature difference value, the heat capacity of the exhaust gas, and the exhaust mass flow to obtain the heat value.

[0045] In a possible implementation, the first determining module is configured to:

[0046] determine a first ratio of the heat value to the heat value of unit fuel combustion;

[0047] The determined first ratio and the second ratio of the HC conversion efficiency are used as the second injection amount.

[0048] In a possible implementation, the second determining module is configured to:

[0049] If the sum of the first injection amount and the second injection amount of the branch is less than the injection boundary value, the sum is used as the required injection amount of the branch.

[0050] If the sum of the first injection amount and the second injection amount of the branch is greater than or equal to the injection boundary value, the injection boundary value is used as the required injection amount of the branch.

[0051] In a possible implementation, the control module is configured to:

[0052] If the aftertreatment system includes two branches, a third temperature measured by a sensor upstream of a DPF in a first branch of the aftertreatment system and a fourth temperature measured by a sensor upstream of a DPF in a second branch are acquired in real time.

[0053] Based on the relationship between the third temperature and the fourth temperature, the injection amount of the HC injection device to the DOC in the two branches is controlled.

[0054] In a possible implementation, the control module is configured to:

[0055] If the third temperature is greater than the fourth temperature, the injection amount of the HC injection device to the DOC in the first branch is reduced, and the injection amount of the HC injection device to the DOC in the second branch is increased.

[0056] If the third temperature is less than the fourth temperature, the injection amount of the HC injection device to the DOC in the first branch is increased, and the injection amount of the HC injection device to the DOC in the second branch is reduced.

[0057] If the third temperature is equal to the fourth temperature, the injection amount of the HC injection device to the DOC in each branch is kept unchanged.

[0058] According to a third aspect of the embodiments of the present disclosure, an engine injection amount control device is provided, including a processor, a memory for storing processor-executable instructions, wherein the processor implements the steps of the engine injection amount control method by running the executable instructions.

[0059] According to a fourth aspect of the embodiments of the present disclosure, a computer readable storage medium is provided, which stores computer instructions, and the instructions are executed by a processor to implement the steps of the engine injection amount control method. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0061] Figure 1 is a schematic diagram of an application scenario according to an exemplary embodiment;

[0062] Figure 2 is a flow chart showing a method for controlling the fuel injection amount of an engine according to an exemplary embodiment;

[0063] Figure 3 is a specific flow chart of a method for controlling the fuel injection amount of an engine according to an exemplary embodiment;

[0064] Figure 4 is a schematic diagram illustrating a method for determining a required fuel injection amount of a branch line according to an exemplary embodiment;

[0065] Figure 5 is a flow chart showing a method for determining a second fuel injection amount according to an exemplary embodiment;

[0066] Figure 6 is a flow chart showing a method for controlling an HC injection device to inject fuel into a DOC in each branch according to an exemplary embodiment;

[0067] Figure 7 is a schematic diagram illustrating a method for controlling an HC injection device to inject fuel into a DOC in each branch according to an exemplary embodiment;

[0068] Figure 8 is a layout diagram of an engine after-treatment system according to an exemplary embodiment;

[0069] Figure 9 is a schematic diagram of a device for controlling fuel injection quantity of an engine according to an exemplary embodiment;

[0070] Figure 10 is a schematic diagram of an electronic device illustrating a method for controlling an engine fuel injection amount according to an exemplary embodiment;

[0071] Figure 11 The diagram is a program product diagram showing a method for controlling the fuel injection quantity of an engine according to an exemplary embodiment. DETAILED DESCRIPTION

[0072] In order to make the purposes, technical solutions and advantages of the present disclosure clearer, the present disclosure will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present disclosure.

[0073] Some words appearing in the text are explained as follows:

[0074] 1. In the embodiments of the present disclosure, the term "and / or" describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after it.

[0075] 2. The terms "first", "second", and the like in the description, claims, and above-mentioned drawings of the embodiments of the present disclosure are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present disclosure described herein can be implemented in an order other than that illustrated or described herein.

[0076] The application scenarios described in the embodiments of the present disclosure are used to more clearly illustrate 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 can know that, as new application scenarios appear, the technical solutions provided by the embodiments of the present disclosure are also applicable to similar technical problems. In the description of the present disclosure, unless otherwise specified, the meaning of "multiple" is two or more.

[0077] At present, as the running time of the engine increases, the carbon particles trapped by the DPF increase, which can cause the exhaust back pressure of the engine to become larger, the in-cylinder combustion to deteriorate, the fuel consumption and the emission to become worse, and the power and the fuel economy of the engine to be affected. Therefore, when the carbon particles accumulate to a certain amount, the DPF needs to be periodically regenerated. During the regeneration process, the engine sprays fuel, for example, HC, into the DOC, the fuel is oxidized and generates heat in the DOC, high temperature is generated, carbon soot is oxidized and burned at high temperature to remove it, and the function of the DPF is restored. However, due to the uneven fuel gas flow sprayed into the DOC during the regeneration process, a high temperature can occur inside the DPF, which can cause the carrier to crack and melt.

[0078] In order to solve the above problems, the present disclosure provides a control method and device for engine fuel injection amount and a medium, which can reduce the carrier cracking and melting caused by the uneven fuel gas flow sprayed into the DOC during the regeneration process in the prior art.

[0079] Reference is first made to Figure 1 which is a schematic diagram of an application scenario of embodiments of the present disclosure, comprising a post-processing system 11 and an electronic control unit (ECU) 12, wherein the post-processing system 11 is configured to send the first temperature upstream of the DPF of each branch to the electronic control unit 12; the electronic control unit 12 is configured to determine the required injection amount of each branch based on the first temperature upstream of the DPF of each branch sent by the post-processing system 11, and control the HC injection device to inject oil into the DOC in each branch.

[0080] In embodiments of the present disclosure, the electronic control unit 12 detects that the DPF needs to be regenerated, and respectively acquires the first temperature upstream of the DPF of each branch in the post-processing system 11 measured by a sensor, wherein the post-processing system 11 comprises a plurality of branches, and each branch comprises a DOC, a sensor and a DPF; for each branch, the regeneration temperature is closed-loop controlled according to a set DPF upstream temperature and the first temperature of the branch, and the first injection amount of the branch is determined according to the closed-loop control result; wherein the set DPF upstream temperature is determined according to a second temperature measured by a sensor on an exhaust pipe upstream of the DOC in the post-processing system 11, an exhaust gas mass flow and a first corresponding relationship, and the first corresponding relationship is a corresponding relationship between each second temperature, each exhaust gas mass flow and each DPF upstream temperature; the required injection amount of the branch is determined according to the first injection amount of the branch, a second injection amount and an injection boundary value, wherein the second injection amount is determined based on the second temperature, a heat value of unit fuel combustion and the exhaust gas mass flow; the HC injection device in the post-processing system 11 is controlled to inject oil into the DOC in each branch based on the required injection amount of each branch.

[0081] In some embodiments, a method for controlling the injection amount of an engine provided by the present disclosure is described below through specific embodiments, as shown in Figure 2 , comprising:

[0082] Step 201, detecting that the DPF needs to be regenerated, and respectively acquiring the first temperature upstream of the DPF of each branch in the post-processing system measured by a sensor;

[0083] Wherein the post-processing system comprises a plurality of branches, and each branch comprises a DOC, a sensor and a DPF.

[0084] The above DPF mainly filters and captures the particles in the engine exhaust through diffusion, deposition and impact mechanism. When the exhaust gas flows through the trap, the particles in the exhaust gas are adsorbed onto the filter core of the filter body, and the remaining relatively clean exhaust gas is discharged into the atmosphere. At present, the wall-flow honeycomb ceramic filter is more commonly used.

[0085] DOC is a noble metal catalyst (such as Pt (platinum) and the like) coated on a honeycomb ceramic carrier, which aims to reduce the chemical reaction activation energy of HC, CO (carbon monoxide) and SOF (Soluble Orangic Fraction, organic soluble component) in engine exhaust, so that these substances can be oxidized at a lower temperature with oxygen in the exhaust and eventually converted into CO2 (carbon dioxide) and H2O (water).

[0086] The basic working principle of the particulate matter trapping system is that when the engine exhaust gas flows through the DOC, CO and HC are first almost completely oxidized to CO2 and H2O at a temperature of 200-600°C, while NO (nitric oxide) is converted to NO2 (nitrogen dioxide). After the exhaust gas from the DOC enters the DPF, the particulates in the exhaust gas are adsorbed onto the filter core of the filter body, and the remaining relatively clean exhaust gas is discharged into the atmosphere, and the trapping efficiency of the DPF can be more than 90%.

[0087] The exhaust particulate matter of the engine mainly contains two components: unburned soot and ash, among which the particulate emission material is mostly composed of tiny particles of carbon and carbide. Soot is the part of exhaust particulate matter that can be burned off by regeneration, and ash is the part of exhaust particulate matter that cannot be burned off.

[0088] As the working time increases, the particulate matter accumulated on the DPF increases, which not only affects the filtering effect of the DPF, but also increases the exhaust back pressure, thereby affecting the engine breathing and combustion, resulting in reduced power output and increased fuel consumption, so how to timely eliminate the particulate matter on the DPF (DPF regeneration) is the key to the technology. DPF regeneration refers to the gradual increase of particulate matter in the trap during long-term operation of the DPF, which can cause the engine back pressure to rise, resulting in a decrease in engine performance, so the deposited particulate matter needs to be removed regularly to restore the filtering performance of the DPF.

[0089] There are two methods of DPF regeneration: active regeneration and passive regeneration. Active regeneration refers to using external energy to increase the temperature inside the DPF to ignite and burn the particulate matter. When the pressure difference sensor before and after the DPF detects that the back pressure before and after the DPF is too large, it is considered that the carbon accumulation capacity of the DPF has been reached, at which time the temperature inside the DPF is increased by external energy, for example, by injecting fuel before the DOC and burning it, to raise the temperature inside the DPF to a certain temperature, so that the deposited particulate matter is oxidized and burned, achieving the purpose of regeneration. The temperature of the DPF rises to above 550°C to burn the trapped particulate matter, thereby restoring the trapping capacity of the DPF.

[0090] Passive regeneration refers to that in a certain temperature range (generally 250-450℃), NO2 in the exhaust gas has strong oxidation ability to the trapped particles, so that the particulate in the particulate trap can be removed by using NO2 as an oxidant to generate CO2, and NO2 is reduced to NO, thereby achieving the purpose of removing particulates.

[0091] In step 202, for each branch, the regeneration temperature is closed-loop controlled according to the set DPF upstream temperature and the first temperature of the branch, and the first fuel injection amount of the branch is determined according to the closed-loop control result.

[0092] The set DPF upstream temperature is determined according to the second temperature measured by a sensor on the exhaust pipe upstream of the DOC in the aftertreatment system, the exhaust gas mass flow, and a first correspondence relationship, and the first correspondence relationship is a correspondence relationship between each second temperature, each exhaust gas mass flow, and each DPF upstream temperature. The first correspondence relationship can be a data table (Map).

[0093] When the first correspondence relationship is a data table and includes 4 correspondence relationships, as shown in Table 1, the 4 correspondence relationships are: the second temperature T1 and the exhaust gas mass flow C1 correspond to the DPF upstream temperature T a ; the second temperature T1 and the exhaust gas mass flow C2 correspond to the DPF upstream temperature T c ; the second temperature T2 and the exhaust gas mass flow C1 correspond to the DPF upstream temperature T b ; and the second temperature T3 and the exhaust gas mass flow C3 correspond to the DPF upstream temperature T d .

[0094] Table 1

[0095] Second temperature Exhaust gas mass flow Temperature upstream of DPF <T1> [C2] [TECHNICAL FIELD] a ]] <T1> [C2] [TECHNICAL FIELD] b ]] [T2] [C1] [CAT c ]]> [T3] [C3] [TECHNICAL FIELD] d ]]

[0096] Based on the data in Table 1 above, if the second temperature T2 measured by a sensor on the exhaust pipe upstream of the DOC in the aftertreatment system and the exhaust gas mass flow C1 are obtained, the corresponding DPF upstream temperature T b is determined.

[0097] In step 203, the fuel injection amount required by the branch is determined according to the first fuel injection amount, the second fuel injection amount, and the fuel injection boundary value of the branch.

[0098] The second fuel injection amount is determined based on the second temperature, the heat value of unit fuel combustion, and the exhaust gas mass flow. The fuel injection boundary value is set according to actual conditions.

[0099] In step 204, the HC injection device is controlled to inject fuel into the DOC in each branch based on the fuel injection amount required by each branch.

[0100] Specifically, based on the required injection amount of each branch, the butterfly valve can be used to control the HC injection device to inject oil into the DOC in each branch.

[0101] The present disclosure controls the regeneration temperature in a closed loop for each branch of the aftertreatment system according to the set DPF upstream temperature and the first temperature measured by the sensor upstream of the DPF of the branch, and determines the first injection amount of the branch according to the closed loop control result, and determines the required injection amount of each branch according to the first injection amount, the second injection amount and the injection boundary value of the branch. And the present disclosure controls the HC injection device to inject oil into the DOC in each branch based on the required injection amount of each branch, thereby achieving accurate control of the injection amount of each branch, reducing the carrier cracking and melting caused by uneven injection of oil flow into the DOC during regeneration in the prior art, and thereby improving the reliability of DPF regeneration.

[0102] The specific steps of the above-mentioned engine injection amount control method are described in detail as follows, including: Figure 3 as shown in the figure, comprising:

[0103] Step 301, detecting that the DPF needs to be regenerated;

[0104] Step 302, respectively acquiring the first temperature measured by the sensor upstream of the DPF of each branch in the aftertreatment system;

[0105] Step 303, for each branch, controlling the regeneration temperature in a closed loop according to the set DPF upstream temperature and the first temperature of the branch, and determining the first injection amount of the branch according to the closed loop control result;

[0106] The closed loop control is a control method that corrects according to the quota or standard when the actual value deviates from the target value, so that the actual value gradually reaches the target value. The present disclosure adjusts the first injection amount injected into the DOC in each branch of the aftertreatment system based on the temperature deviation between the set DPF upstream temperature (target regeneration temperature) and the first temperature (actual temperature) measured by the sensor upstream of the DPF in the branch, so as to control the first temperature in the branch to increase to the set DPF upstream temperature, so as to meet the requirement of the regeneration temperature during DPF regeneration.

[0107] Therefore, the specific process of the above-mentioned step 303 is as follows:

[0108] Calculate the temperature deviation between the set DPF upstream temperature and the first temperature of the branch;

[0109] The temperature deviation is converted into the first injection amount of the branch by using a PI controller (Proportional Integral Controller).

[0110] The specific method of converting the temperature deviation into the injection amount by using the PI controller is prior art, which is not described herein.

[0111] As shown in Figure 4 , for each branch, a set DPF upstream temperature T2 corresponding to the second temperature T1 measured by a sensor on an exhaust pipe upstream of a DOC in the aftertreatment system and the exhaust mass flow is determined based on a DPF upstream temperature setting value Map, i.e., a first correspondence relationship. The set DPF upstream temperature T2 is subtracted from the first temperature T 51 of the branch to obtain a corresponding temperature deviation, which is input into the PI controller to obtain a first injection amount of the branch output by the PI controller.

[0112] In step 304, a second injection amount is determined based on the second temperature, the heat value of unit fuel combustion, and the exhaust mass flow.

[0113] The execution order of the above steps 304 and 303 can be set according to actual conditions. The second injection amounts corresponding to the branches are the same.

[0114] The specific process of the above step 304 is shown in Figure 5 , which includes:

[0115] In step 501, a heat value required for regeneration is determined based on the second temperature, the heat capacity of exhaust gas, and the exhaust mass flow.

[0116] The heat capacity of the exhaust gas is determined according to the second temperature and a second correspondence relationship between the second temperatures and the heat capacities of the exhaust gas. The second relationship can be a data table or a curve (CUR).

[0117] The specific method of determining the heat value required for regeneration based on the second temperature, the heat capacity of the exhaust gas, and the exhaust mass flow is as follows:

[0118] A temperature difference between a set temperature and the second temperature is determined, wherein the set temperature is greater than the second temperature.

[0119] The product of the determined temperature difference, the heat capacity of the exhaust gas, and the exhaust mass flow is taken as the heat value.

[0120] The set temperature can be 600℃, or can be set to other values according to actual conditions.

[0121] Specifically, the heat value Q required for regeneration can be determined by the following formula:

[0122] Q = c * m * (T a -T b );

[0123] wherein c is the exhaust gas mass flow, m is the heat capacity of the exhaust gas, T a is the set temperature, T b is the second temperature.

[0124] Step 502, determining the second fuel injection amount based on the heat value, the heat value per unit fuel combustion, and the HC conversion efficiency.

[0125] wherein the HC conversion efficiency is determined according to the second temperature, the exhaust gas mass flow, and a third correspondence relationship, and the third correspondence relationship is a correspondence relationship between each second temperature, each exhaust gas mass flow, and each HC conversion efficiency.

[0126] wherein the specific method for determining the second fuel injection amount based on the heat value, the heat value per unit fuel combustion, and the HC conversion efficiency is as follows:

[0127] determining a first ratio of the heat value to the heat value per unit fuel combustion;

[0128] determining a second ratio of the HC conversion efficiency to the first ratio as the second fuel injection amount.

[0129] Specifically, the second fuel injection amount q can be determined by the following formula:

[0130] q = Q / M / p;

[0131] wherein Q is the heat value, M is the heat value per unit fuel combustion, and p is the HC conversion efficiency.

[0132] Step 305, determining the fuel injection amount required for the branch according to the first fuel injection amount, the second fuel injection amount, and a fuel injection boundary value of the branch;

[0133] The above step 305 specifically includes the following cases:

[0134] if the sum of the first fuel injection amount and the second fuel injection amount of the branch is less than the fuel injection boundary value, then the sum is taken as the fuel injection amount required for the branch;

[0135] if the sum of the first fuel injection amount and the second fuel injection amount of the branch is greater than or equal to the fuel injection boundary value, then the fuel injection boundary value is taken as the fuel injection amount required for the branch.

[0136] For example, Figure 4As shown, for each branch, the sum of the first injection amount and the second injection amount is determined, and the minimum value between the sum and the injection boundary value is taken as the injection amount required by the branch.

[0137] In step 306, based on the injection amount required by each branch, the HC injection device is controlled to inject HC into the DOC in each branch.

[0138] When the aftertreatment system includes two branches, in order to make the HC injected by the HC injection device into the DOC in each branch more uniform, and further control the DPF active regeneration process, and improve the DPF use reliability, for example, Figure 6 As shown, the HC injection device is controlled to inject HC into the DOC in each branch by the following method:

[0139] In step 601, a third temperature measured by a sensor located upstream of the DPF in the first branch of the aftertreatment system is acquired in real time, and a fourth temperature measured by a sensor located upstream of the DPF in the second branch is acquired in real time.

[0140] In step 602, based on the relationship between the third temperature and the fourth temperature, the injection amount of the HC injection device injected into the DOC in the two branches is controlled.

[0141] The above-mentioned control of the injection amount of the HC injection device injected into the DOC in the two branches based on the relationship between the third temperature and the fourth temperature specifically includes the following cases:

[0142] If the third temperature is greater than the fourth temperature, the injection amount of the HC injection device injected into the DOC in the first branch is reduced, and the injection amount of the HC injection device injected into the DOC in the second branch is increased;

[0143] If the third temperature is less than the fourth temperature, the injection amount of the HC injection device injected into the DOC in the first branch is increased, and the injection amount of the HC injection device injected into the DOC in the second branch is reduced;

[0144] If the third temperature is equal to the fourth temperature, the injection amount of the HC injection device injected into the DOC in each branch is kept unchanged.

[0145] In the above-mentioned control of the HC injection device to inject HC into the DOC in the two branches, one butterfly valve can be used to control the injection amount of the HC injection device injected into the DOC in the two branches; or two butterfly valves can be used to control the injection amount of the HC injection device injected into the DOC in each branch.

[0146] When one butterfly valve is used to control the injection amount of the HC injection device injected into the DOC in the two branches, as shown, Figure 7 As shown, the third temperature T51 and the fourth temperature T 52 , calculate the deviation between the third temperature T 51 and the fourth temperature T 52 , determine the butterfly valve opening degree corresponding to the deviation based on CUR, wherein CUR includes the correspondence between each deviation and each butterfly valve opening degree. Based on the determined butterfly valve opening degree and the butterfly valve opening degree boundary, adjust the opening degree of the butterfly valve, so as to realize the adjustment of the oil injection amount of the HC injection device to the DOC in each branch. The present disclosure utilizes the relationship between the third temperature and the fourth temperature to continuously adjust the opening degree of the butterfly valve, so as to stabilize the regeneration temperature in the DPF regeneration process.

[0147] When the first butterfly valve is used to control the oil injection amount of the HC injection device to the DOC in the first branch, and the second butterfly valve is used to control the oil injection amount of the HC injection device to the DOC in the second branch, the above-mentioned control of the oil injection amount of the HC injection device to the DOC in the two branches based on the relationship between the third temperature and the fourth temperature specifically includes:

[0148] If the third temperature is greater than the fourth temperature, the opening degree of the first butterfly valve is reduced, so as to reduce the oil injection amount of the HC injection device to the DOC in the first branch, and the opening degree of the second butterfly valve is increased, so as to increase the oil injection amount of the HC injection device to the DOC in the second branch;

[0149] If the third temperature is less than the fourth temperature, the opening degree of the first butterfly valve is increased, so as to increase the oil injection amount of the HC injection device to the DOC in the first branch, and the opening degree of the second butterfly valve is reduced, so as to reduce the oil injection amount of the HC injection device to the DOC in the second branch;

[0150] If the third temperature is equal to the fourth temperature, the opening degrees of the first butterfly valve and the second butterfly valve are kept unchanged, so as to keep the oil injection amount of the HC injection device to the DOC in each branch unchanged.

[0151] In order to further illustrate the technical idea of the present disclosure, the technical scheme of the present disclosure will be described in combination with a specific application scenario.

[0152] Figure 8 The engine aftertreatment system layout in the embodiment of the present disclosure is as follows: Figure 8The exhaust gas after TC (Turbine Charger) is discharged after HC injection device 802, two-way DOC+DPF, mixer, urea injection device 809, two-way SCR (Selective Catalytic Reduction) + ASC (Ammonia Slip Catalyst). The temperature sensor 805 is arranged upstream of the first DPF, the temperature sensor 806 is arranged upstream of the second DPF, the pressure difference sensor 807 is arranged in the first DPF, and the pressure difference sensor 808 is arranged in the second DPF. In addition, the NO X sensor 801, the temperature sensor 803, the butterfly valve 804 is arranged on the exhaust pipe upstream of the DOC, the temperature sensor 810 is arranged in the exhaust pipe upstream of the SCR, the NO X sensor 811, the temperature sensor 812 and the PM (Particulate Matter) sensor 813 are arranged in the exhaust pipe downstream of the ASC.

[0153] The aftertreatment system of the present disclosure adds one way of DOC+DPF to the prior art, that is, two-way DOC+DPF is arranged in parallel, thereby reducing the exhaust back pressure of the engine, improving the thermal efficiency of the engine, saving fuel consumption, and reducing the use cost.

[0154] Based on the aftertreatment system in Figure 8 , the specific process of the engine fuel injection amount control method is as follows:

[0155] When it is detected that the two DPFs need to be regenerated, the temperature T 51 of the first branch measured by the temperature sensor 805 and the temperature T 52 of the second branch measured by the temperature sensor 806 are obtained; based on the second temperature T1 measured by the temperature sensor 803, the heat value per unit fuel combustion and the exhaust gas mass flow, the second fuel injection amount A1 is determined.

[0156] Based on the first corresponding relationship, the set DPF upstream temperature T2 corresponding to the second temperature T1 measured by the temperature sensor 803 and the exhaust gas mass flow is determined; for the first branch, the set DPF upstream temperature T2 is compared with the temperature T 51Subtract the two to obtain the corresponding deviation, and input the deviation into the PI controller to obtain the first injection amount B1 of the first branch output by the PI controller; calculate the sum C1 of the first injection amount B1 and the second injection amount A1, and take the minimum value between the sum C1 and the injection boundary value D as the required injection amount q1 of the branch; based on the required injection amount q1 of the first branch, adjust the opening of the butterfly valve 804 to control the HC injection device 802 to inject fuel into the first DOC in the first branch.

[0157] For the second branch, the set DPF upstream temperature T2 is compared with the temperature T 52 Subtract the two to obtain the corresponding deviation, and input the deviation into the PI controller to obtain the first injection amount B2 of the second branch output by the PI controller; calculate the sum C2 of the first injection amount B2 and the second injection amount A2, and take the minimum value between the sum C2 and the injection boundary value D as the required injection amount q2 of the branch; based on the required injection amount q2 of the second branch, adjust the opening of the butterfly valve 804 to control the HC injection device 802 to inject fuel into the second DOC in the second branch.

[0158] During the process of the HC injection device 802 injecting oil into each branch, the temperature T of the first branch measured by the temperature sensor 805 is obtained in real time. 51 and the temperature T of the second branch measured by the temperature sensor 806 52 If the temperature T 51 Greater than temperature T 52 , by adjusting the opening of the butterfly valve 804, the amount of fuel injected by the HC injection device 802 to the first DOC in the first branch is reduced, and the amount of fuel injected by the HC injection device 802 to the second DOC in the second branch is increased; if the temperature T 51 Less than temperature T 52 , by adjusting the opening of the butterfly valve 804, the amount of fuel injected by the HC injection device 802 to the first DOC in the first branch is increased, and the amount of fuel injected by the HC injection device 802 to the second DOC in the second branch is reduced; if the temperature T 51 Equal to temperature T 52 , the current opening of the butterfly valve 804 is kept unchanged, that is, the amount of fuel injected by the HC injection device 802 to the DOC in each branch is kept unchanged.

[0159] In some embodiments, based on the same inventive concept, the embodiments of the present disclosure also provide a device for controlling the amount of engine fuel injection. Since the device is the device in the method in the embodiments of the present disclosure, and the principle of solving the problem by the device is similar to that of the method, the implementation of the device can refer to the implementation of the method, and the repeated parts will not be repeated.

[0160] like Figure 9 As shown, the above device includes the following modules:

[0161] The acquisition module 901 is configured to detect that the DPF needs to be regenerated, and acquire a first temperature measured by a sensor upstream of the DPF in each branch of an aftertreatment system, wherein the aftertreatment system includes a plurality of branches, and each branch includes a DOC, a sensor, and a DPF;

[0162] The first determination module 902 is configured to, for each branch, perform closed-loop control on a regeneration temperature according to a set DPF upstream temperature and the first temperature of the branch, and determine a first fuel injection amount of the branch according to a result of the closed-loop control, wherein the set DPF upstream temperature is determined according to a second temperature measured by a sensor on an exhaust pipe upstream of a DOC in the aftertreatment system, an exhaust gas mass flow, and a first correspondence relationship, and the first correspondence relationship is a correspondence relationship between each second temperature, each exhaust gas mass flow, and each DPF upstream temperature.

[0163] The second determination module 903 is configured to determine a required fuel injection amount of the branch according to the first fuel injection amount, a second fuel injection amount, and a fuel injection boundary value, wherein the second fuel injection amount is determined based on the second temperature, a heat value of unit fuel combustion, and the exhaust gas mass flow.

[0164] The control module 904 is configured to control an HC injection device to inject fuel to the DOC in each branch based on the required fuel injection amount of each branch.

[0165] As an optional implementation, the first determination module 902 is configured to:

[0166] determine a heat value required for regeneration based on the second temperature, a heat capacity of exhaust gas, and the exhaust gas mass flow, wherein the heat capacity of exhaust gas is determined according to the second temperature and a second correspondence relationship, and the second correspondence relationship is a correspondence relationship between each second temperature and each heat capacity of exhaust gas.

[0167] determine the second fuel injection amount based on the heat value, a heat value of unit fuel combustion, and an HC conversion efficiency, wherein the HC conversion efficiency is determined according to the second temperature, the exhaust gas mass flow, and a third correspondence relationship, and the third correspondence relationship is a correspondence relationship between each second temperature, each exhaust gas mass flow, and each HC conversion efficiency.

[0168] As an optional implementation, the first determination module 904 is configured to:

[0169] determine a temperature difference between a set temperature and the second temperature, wherein the set temperature is greater than the second temperature.

[0170] The product of the determined temperature difference, the heat capacity of the exhaust gas and the exhaust gas mass flow is taken as the heat value.

[0171] As an optional implementation, the first determining module 902 is configured to:

[0172] determine a first ratio of the heat value to the heat value per unit fuel combustion;

[0173] take the determined first ratio and a second ratio of the HC conversion efficiency as the second fuel injection amount.

[0174] As an optional implementation, the second determining module 903 is configured to:

[0175] if the sum of the first fuel injection amount and the second fuel injection amount of the branch is less than the fuel injection boundary value, take the sum as the fuel injection amount required by the branch;

[0176] if the sum of the first fuel injection amount and the second fuel injection amount of the branch is greater than or equal to the fuel injection boundary value, take the fuel injection boundary value as the fuel injection amount required by the branch.

[0177] As an optional implementation, the control module 904 is configured to:

[0178] if the aftertreatment system includes two branches, acquire a third temperature measured by a sensor upstream of a DPF in a first branch of the aftertreatment system and a fourth temperature measured by a sensor upstream of a DPF in a second branch of the aftertreatment system in real time;

[0179] based on the relationship between the third temperature and the fourth temperature, control the fuel injection amount of the HC injection device injected into the DOCs in the two branches.

[0180] As an optional implementation, the control module 904 is configured to:

[0181] if the third temperature is greater than the fourth temperature, decrease the fuel injection amount of the HC injection device injected into the DOC in the first branch and increase the fuel injection amount of the HC injection device injected into the DOC in the second branch;

[0182] if the third temperature is less than the fourth temperature, increase the fuel injection amount of the HC injection device injected into the DOC in the first branch and decrease the fuel injection amount of the HC injection device injected into the DOC in the second branch;

[0183] if the third temperature is equal to the fourth temperature, keep the fuel injection amount of the HC injection device injected into the DOC in each branch unchanged.

[0184] In some embodiments, based on the same inventive concept, the disclosure also provides an engine fuel injection amount control device, which can implement the engine fuel injection amount control function discussed above. Please refer to Figure 10 The device includes a processor 101 and a memory 102, wherein the memory 102 is used to store program instructions.

[0185] The processor 101 calls the program instructions stored in the memory and runs the program instructions to implement:

[0186] Detecting that the DPF needs to be regenerated, and obtaining a first temperature measured by a sensor upstream of the DPF in each branch of an aftertreatment system, wherein the aftertreatment system includes multiple branches, and each branch includes a DOC, a sensor, and a DPF;

[0187] For each branch, performing closed-loop control on a regeneration temperature according to a set DPF upstream temperature and the first temperature of the branch, and determining a first fuel injection amount of the branch according to a closed-loop control result; wherein the set DPF upstream temperature is determined according to a second temperature measured by a sensor on an exhaust pipe upstream of a DOC in the aftertreatment system, an exhaust gas mass flow, and a first correspondence relationship, and the first correspondence relationship is a correspondence relationship between each second temperature, each exhaust gas mass flow, and each DPF upstream temperature;

[0188] Determining a required fuel injection amount of the branch according to the first fuel injection amount, a second fuel injection amount, and a fuel injection boundary value, wherein the second fuel injection amount is determined based on the second temperature, a heat value of unit fuel combustion, and the exhaust gas mass flow;

[0189] Controlling an HC injection device to inject fuel into the DOC in each branch based on the required fuel injection amount of each branch.

[0190] As an optional implementation, the second fuel injection amount is determined based on the second temperature, the heat value of unit fuel combustion, and the exhaust gas mass flow, which includes:

[0191] Determining a heat value required for regeneration based on the second temperature, a heat capacity of exhaust gas, and the exhaust gas mass flow, wherein the heat capacity of exhaust gas is determined according to the second temperature and a second correspondence relationship, and the second correspondence relationship is a correspondence relationship between each second temperature and each heat capacity of exhaust gas;

[0192] Determining the second fuel injection amount based on the heat value, the heat value of unit fuel combustion, and an HC conversion efficiency, wherein the HC conversion efficiency is determined according to the second temperature, the exhaust gas mass flow, and a third correspondence relationship, and the third correspondence relationship is a correspondence relationship between each second temperature, each exhaust gas mass flow, and each HC conversion efficiency.

[0193] As an optional implementation, the determining of the heat value required for the regeneration based on the second temperature, the heat capacity of the exhaust gas, and the exhaust gas mass flow rate comprises:

[0194] determining a temperature difference between a set temperature and the second temperature, wherein the set temperature is greater than the second temperature;

[0195] multiplying the determined temperature difference, the heat capacity of the exhaust gas, and the exhaust gas mass flow rate to obtain the heat value.

[0196] As an optional implementation, the determining of the second fuel injection amount based on the heat value, the heat value per unit fuel combustion, and the HC conversion efficiency comprises:

[0197] determining a first ratio of the heat value to the heat value per unit fuel combustion;

[0198] multiplying the determined first ratio and a second ratio of the HC conversion efficiency to obtain the second fuel injection amount.

[0199] As an optional implementation, the determining of the fuel injection amount required for the branch based on the first fuel injection amount, the second fuel injection amount, and a fuel injection boundary value of the branch comprises:

[0200] if the sum of the first fuel injection amount and the second fuel injection amount of the branch is less than the fuel injection boundary value, the sum is taken as the fuel injection amount required for the branch;

[0201] if the sum of the first fuel injection amount and the second fuel injection amount of the branch is greater than or equal to the fuel injection boundary value, the fuel injection boundary value is taken as the fuel injection amount required for the branch.

[0202] As an optional implementation, the controlling of the HC injection device to inject fuel into the DOC in each branch comprises:

[0203] if the aftertreatment system comprises two branches, a third temperature measured by a sensor upstream of the DPF in a first branch of the aftertreatment system and a fourth temperature measured by a sensor upstream of the DPF in a second branch are acquired in real time;

[0204] based on the relationship between the third temperature and the fourth temperature, the HC injection device is controlled to inject fuel into the DOC in the two branches.

[0205] As an optional implementation, the controlling of the HC injection device to inject fuel into the DOC in the two branches based on the relationship between the third temperature and the fourth temperature comprises:

[0206] If the third temperature is greater than the fourth temperature, the HC injection device is instructed to decrease the injection amount of the DOC injection in the first branch and increase the injection amount of the DOC injection in the second branch;

[0207] If the third temperature is less than the fourth temperature, the HC injection device is instructed to increase the injection amount of the DOC injection in the first branch and decrease the injection amount of the DOC injection in the second branch;

[0208] If the third temperature is equal to the fourth temperature, the injection amount of the DOC injection in each branch by the HC injection device is maintained.

[0209] In some possible implementation manners, various aspects of the present disclosure can also be implemented in the form of a program product, such as a computer program product 110 shown in FIG. 10, which comprises computer program code. When the computer program code is run on a computer, the computer is caused to perform the engine injection amount control method as discussed in any of the foregoing. Since the principle of the computer program product to solve the problem is similar to the engine injection amount control method, the implementation of the computer program product can be referred to the implementation of the method, and the repeated parts will not be described herein. Figure 11

[0210] Those skilled in the art should understand that the embodiments of the present disclosure can be provided as a method, a system, or a computer program product. Therefore, the present disclosure can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present disclosure can 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.

[0211] The present disclosure is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the 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 a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing apparatus to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing apparatus produce a device that implements the functions specified in the flowcharts and / or block diagrams. Figure 1 The device that implements the functions specified in one or more flows and / or blocks Figure 1 The device that implements the functions specified in one or more flows and / or blocks

[0212] ​These computer program instructions can also be stored in a computer- readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions Figure 1 functionality specified in the flow or flows and / or blocks Figure 1 of the block or blocks.

[0213] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions Figure 1 functionality specified in the flow or flows and / or blocks Figure 1 of the block or blocks.

[0214] Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. It is intended that the specification and examples be considered as exemplary only, with the true scope and spirit of the disclosure being indicated by the following claims.

[0215] It will be understood that the disclosure is not limited to the precise structures herein described and illustrated in the drawings, and that various modifications and changes can be made without departing from its scope. The scope of the disclosure is limited only by the claims that follow.

Claims

1. A method of controlling fuel injection amount of an engine, characterized by, The method comprises: detecting that a diesel particulate filter (DPF) needs to be regenerated, and acquiring a first temperature measured by a sensor upstream of the DPF in each branch of an aftertreatment system, wherein the aftertreatment system comprises a plurality of branches, each branch comprising a diesel oxidation catalyst (DOC), a sensor, and a DPF; for each branch, performing closed-loop control of a regeneration temperature according to a set DPF upstream temperature and the first temperature of the branch, and determining a first fuel injection amount of the branch according to a result of the closed-loop control, wherein the set DPF upstream temperature is determined according to a second temperature measured by a sensor on an exhaust pipe upstream of a DOC in the aftertreatment system, an exhaust gas mass flow, and a first correspondence relationship between each second temperature, each exhaust gas mass flow, and each DPF upstream temperature; determining a required fuel injection amount of the branch according to the first fuel injection amount, a second fuel injection amount, and a fuel injection boundary value, wherein the second fuel injection amount is determined based on the second temperature, a heat value per unit fuel combustion, and the exhaust gas mass flow; controlling a hydrocarbon (HC) injection device to inject fuel into the DOC in each branch based on the required fuel injection amount of each branch; wherein the controlling the HC injection device to inject fuel into the DOC in each branch comprises: if the aftertreatment system comprises two branches, acquiring a third temperature measured by a sensor upstream of the DPF in a first branch of the aftertreatment system, and a fourth temperature measured by a sensor upstream of the DPF in a second branch of the aftertreatment system; if the third temperature is greater than the fourth temperature, adjusting a butterfly valve opening degree of a butterfly valve of the aftertreatment system to reduce a fuel injection amount of the HC injection device injected into the DOC in the first branch, and to increase a fuel injection amount of the HC injection device injected into the DOC in the second branch; if the third temperature is less than the fourth temperature, adjusting the butterfly valve opening degree of the butterfly valve to increase the fuel injection amount of the HC injection device injected into the DOC in the first branch, and to reduce the fuel injection amount of the HC injection device injected into the DOC in the second branch; if the third temperature is equal to the fourth temperature, keeping the butterfly valve opening degree of the butterfly valve unchanged to keep the fuel injection amount of the HC injection device injected into the DOC in each branch unchanged; wherein the adjusting the butterfly valve opening degree of the butterfly valve comprises: calculating a deviation between the third temperature and the fourth temperature, determining a butterfly valve opening degree corresponding to the deviation based on the deviation and a curve CUR, wherein the CUR comprises a correspondence relationship between each deviation and each butterfly valve opening degree, determining a required butterfly valve opening degree of the butterfly valve based on the determined butterfly valve opening degree and a set butterfly valve opening degree boundary, and adjusting the butterfly valve opening degree of the butterfly valve to the required butterfly valve opening degree of the butterfly valve.

2. The method of claim 1, wherein, the determining the second fuel injection amount based on the second temperature, the heat value per unit fuel combustion, and the exhaust gas mass flow comprises: determine a heat value required for the regeneration based on the second temperature, a heat capacity of the exhaust gas, and the exhaust gas mass flow, wherein the heat capacity of the exhaust gas is determined according to the second temperature and a second correspondence relationship between each second temperature and each heat capacity of the exhaust gas; determine the second fuel injection amount based on the heat value, a heat value per unit fuel combustion, and an HC conversion efficiency, wherein the HC conversion efficiency is determined according to the second temperature, the exhaust gas mass flow, and a third correspondence relationship between each second temperature, each exhaust gas mass flow, and each HC conversion efficiency.

3. The method of claim 2, wherein, The determination of the heat value required for the regeneration based on the second temperature, the heat capacity of the exhaust gas, and the exhaust gas mass flow comprises: determining a temperature difference between a set temperature and the second temperature, wherein the set temperature is greater than the second temperature; multiplying the determined temperature difference, the heat capacity of the exhaust gas, and the exhaust gas mass flow to obtain the heat value.

4. The method of claim 2, wherein, The determination of the second fuel injection amount based on the heat value, the heat value per unit fuel combustion, and the HC conversion efficiency comprises: determining a first ratio of the heat value to the heat value per unit fuel combustion; multiplying the determined first ratio and a second ratio of the HC conversion efficiency to obtain the second fuel injection amount.

5. The method of claim 1, wherein, The determination of the fuel injection amount required for the branch based on the first fuel injection amount, the second fuel injection amount, and a fuel injection boundary value comprises: if a sum of the first fuel injection amount and the second fuel injection amount of the branch is less than the fuel injection boundary value, taking the sum as the fuel injection amount required for the branch; if the sum of the first fuel injection amount and the second fuel injection amount of the branch is greater than or equal to the fuel injection boundary value, taking the fuel injection boundary value as the fuel injection amount required for the branch.

6. An engine fuel injection amount control device characterized by comprising: The device comprises: an acquisition module configured to detect that a diesel particulate filter (DPF) needs to be regenerated, and acquire a first temperature measured by a sensor upstream of the DPF in each branch of an aftertreatment system, wherein the aftertreatment system comprises a plurality of branches, each branch comprising a diesel oxidation catalyst (DOC), a sensor, and a DPF; a first determination module configured to, for each branch, perform closed-loop control on a regeneration temperature according to a set DPF upstream temperature and the first temperature of the branch, and determine a first fuel injection amount of the branch according to a closed-loop control result, wherein the set DPF upstream temperature is determined according to a second temperature measured by a sensor on an exhaust pipe upstream of a DOC in the aftertreatment system, an exhaust gas mass flow, and a first correspondence relationship between each second temperature, each exhaust gas mass flow, and each DPF upstream temperature; a second determination module configured to determine a fuel injection amount required for the branch according to the first fuel injection amount, a second fuel injection amount, and a fuel injection boundary value, wherein the second fuel injection amount is determined based on the second temperature, a heat value per unit fuel combustion, and the exhaust gas mass flow; a control module configured to control a hydrocarbon (HC) injection device to inject fuel into the DOC in each branch based on the fuel injection amount required for each branch. The control module is configured to: If the aftertreatment system includes two branches, acquiring a third temperature measured by a sensor upstream of a DPF in a first branch of the aftertreatment system and a fourth temperature measured by a sensor upstream of a DPF in a second branch of the aftertreatment system; If the third temperature is greater than the fourth temperature, adjusting a butterfly valve opening of a butterfly valve of the aftertreatment system to reduce an oil injection amount of the HC injection device to a DOC in the first branch and increase an oil injection amount of the HC injection device to a DOC in the second branch; If the third temperature is less than the fourth temperature, adjusting the butterfly valve opening of the butterfly valve to increase the oil injection amount of the HC injection device to the DOC in the first branch and reduce the oil injection amount of the HC injection device to the DOC in the second branch; If the third temperature is equal to the fourth temperature, keeping the butterfly valve opening of the butterfly valve unchanged to keep the oil injection amount of the HC injection device to the DOC in each branch unchanged. The control module is configured to: calculating a deviation between the third temperature and the fourth temperature, determining a butterfly valve opening corresponding to the deviation based on the deviation and a curve CUR, wherein the CUR includes a corresponding relationship between each deviation and each butterfly valve opening; determining a required butterfly valve opening of the butterfly valve based on the determined butterfly valve opening and a set butterfly valve opening boundary; and adjusting the butterfly valve opening of the butterfly valve to the required butterfly valve opening of the butterfly valve.

7. A device for controlling the amount of fuel injected into an engine, characterized in that: comprise: a processor; a memory for storing processor-executable instructions; wherein the processor implements the steps of the method of any one of claims 1 to 5 by running the executable instructions.

8. A computer readable and writable storage medium having computer instructions stored thereon, characterized in that: The instructions, when executed by the processor, implement the steps of the method of any one of claims 1 to 5.

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