Combustor-assisted DPF active regeneration system and control method

Abstract

The invention discloses a control method for a combustor to assist DPF active regeneration, relates to the field of engine control, and solves the technical problems that regeneration is interrupted due to the fact that the DPF temperature is too low or the DPF is burnt out due to the fact that an existing DPF regeneration mode cannot perform closed-loop control on the T4 temperature and T4 and T5 interactive control on the T4 temperature. The method comprises the steps that the actually-measured temperature of a DOC inlet and the actually-measured temperature of a DPF inlet in a regeneration stage are obtained, when the regeneration stage is a DOC heating stage, a first regeneration control strategy is triggered according to the actually-measured temperature of the DOC inlet to obtain the total oil quantity of a combustor, and the actually-measured temperature of the DOC inlet is adjusted according to the total oil quantity of the combustor; and when the regeneration stage is a DPF regeneration stage, a second regeneration control strategy is triggered according to the actually-measured temperature of the DOC inlet and the actually-measured temperature of the DPF inlet, and the total remote after-injection oil quantity is obtained. The invention further discloses a control system for the combustor assisting DPF active regeneration. Efficient and stable regeneration of the DPF is achieved, and the performance and reliability of an engine aftertreatment system are improved.

Description

Technical Field

[0001] This invention relates to the field of engine control, and more specifically, to a system and control method for active regeneration of a burner-assisted DPF. Background Technology

[0002] With increasingly stringent environmental protection requirements, emission standards for diesel engines are constantly being raised. Euro 7 and above...

[0003] The EPA 2027 emission standards for Europe and the United States, as well as China's China VII emission standards, have imposed stricter requirements on emission limits for pollutants, such as significantly lower limits for NOx, PM, and PN. To meet these requirements, engine after-treatment systems need to be upgraded and optimized accordingly.

[0004] Existing aftertreatment systems typically include components such as DOC (Diesel Oxidation Catalyst), DPF (Diesel Particulate Filter), SCR (Selective Catalytic Reduction), and ASC (Ammonia Slip Catalyst). DPF regeneration is a crucial step in the aftertreatment system, aiming to remove carbon deposits from the DPF through high-temperature combustion, restoring its filtration performance and reducing exhaust back pressure. However, existing DPF regeneration methods have several problems, such as low DOC inlet T4 temperature under low-load conditions, inability to release the necessary fuel injection to raise the T5 temperature for DPF regeneration, frequent regeneration interruptions under low-load conditions, slow DPF regeneration warm-up rate leading to high fuel consumption, high risk of oil dilution, and the inability to implement closed-loop control of the T4 temperature or interactive correction between T4 and T5 temperatures. This results in regeneration interruption due to excessively low DPF temperature, and DPF burnout due to excessively high temperature. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a system and control method for active regeneration of DPF assisted by burner, which addresses the shortcomings of the existing technology. This solves the technical problem that the existing DPF regeneration method cannot perform closed-loop control of T4 temperature and interactive control between T4 and T5, resulting in regeneration interruption due to excessively low DPF temperature or burning of DPF due to excessively high DPF temperature.

[0006] The present invention discloses a control method for active regeneration of burner-assisted DPF. The method involves obtaining the measured temperature of the regeneration stage, the DOC inlet, and the measured temperature of the DPF inlet. When the regeneration stage is the DOC heating stage, a first regeneration control strategy is triggered based on the measured temperature of the DOC inlet to obtain the total oil quantity of the burner. The measured temperature of the DOC inlet is then adjusted based on the total oil quantity of the burner.

[0007] When the regeneration stage is the DPF regeneration stage, the second regeneration control strategy is triggered based on the measured temperature of the DOC inlet and the measured temperature of the DPF inlet to obtain the total fuel injection quantity, and the measured temperature of the DPF inlet is adjusted based on the total fuel injection quantity.

[0008] When the regeneration phase is the cooling phase, shut off the burner and the remote injection process, and fully open the throttle.

[0009] As a further improvement, the first regeneration control strategy is as follows:

[0010] Set the target temperature of the closed-loop DOC inlet, obtain the burner mass, burner specific heat capacity, exhaust pipe mass, exhaust pipe specific heat capacity, exhaust specific heat capacity, and exhaust mass, and calculate the burner pre-controlled oil quantity based on the measured temperature of the DOC inlet, the target temperature of the closed-loop DOC inlet, the burner mass, burner specific heat capacity, exhaust pipe mass, exhaust pipe specific heat capacity, exhaust specific heat capacity, and exhaust mass;

[0011] The burner closed-loop control oil quantity is calculated based on the target temperature and the measured temperature of the DOC inlet.

[0012] The total oil quantity of the burner is obtained by adding the closed-loop control oil quantity of the burner to the pre-controlled oil quantity of the burner.

[0013] Furthermore, the expression for calculating the pre-controlled oil quantity of the burner is as follows:

[0014] U pre =(C1×m1+C2×m2+C3×m3)×(T4 目标 -T4 实测 );

[0015] Among them, U pre Here, m1 is the pre-controlled oil quantity for the burner, m2 is the mass of the exhaust pipe, m3 is the mass of the exhaust gas, C1 is the specific heat capacity of the burner, C2 is the specific heat capacity of the exhaust pipe, C3 is the specific heat capacity of the exhaust gas, and T4 is the specific heat capacity of the exhaust gas. 目标 The target temperature for the closed-loop DOC inlet, T4 实测 This is the measured temperature at the DOC inlet.

[0016] Furthermore, the expression for calculating the burner closed-loop control oil quantity is as follows:

[0017] e(t) = T4 目标 -T4 实测 ;

[0018]

[0019] Among them, U pid For closed-loop control of the burner oil quantity, Kp is the proportional gain of the burner temperature, Ki is the integral gain of the burner temperature, Kd is the derivative gain of the burner temperature, and T4... 目标 The target temperature for the closed-loop DOC inlet, T4 实测This is the measured temperature at the DOC inlet.

[0020] Furthermore, the second regeneration control strategy is as follows:

[0021] Set the target temperature of the closed-loop DPF inlet, obtain the mass of exhaust gas, the specific heat capacity of exhaust gas, the mass of exhaust pipe, the specific heat capacity of exhaust pipe, the mass of DOC carrier, and the specific heat capacity of DOC carrier, and calculate the pre-control fuel quantity for remote injection based on the target temperature of the closed-loop DPF inlet, the measured temperature of the DPF inlet, the mass of exhaust gas, the specific heat capacity of exhaust gas, the mass of exhaust pipe, the specific heat capacity of exhaust pipe, the mass of DOC carrier, and the specific heat capacity of DOC carrier.

[0022] The burner closed-loop control oil quantity is calculated based on the target temperature of the DPF inlet and the measured temperature of the DPF inlet.

[0023] The amount of fuel injected after remote control is obtained based on the target temperature of the closed-loop DOC inlet, the measured temperature of the DOC inlet, the target temperature of the closed-loop DPF inlet, and the measured temperature of the DPF inlet.

[0024] The total amount of fuel injected into the far and rear injection system is obtained by adding the fuel quantity controlled by the pre-control of the far and rear injection system, the fuel quantity controlled by the burner closed loop, and the fuel quantity controlled by the interactive system.

[0025] Furthermore, the expression for calculating the pre-control fuel quantity of the far-rear injection is as follows:

[0026] V pre =(C4×m4+C2×m2+C3×m3)×(T5 目标 -T5 实测 );

[0027] Among them, V pre For the pre-control fuel quantity of the remote injection, m4 is the mass of the DOC carrier, m2 is the mass of the exhaust pipe, m3 is the mass of the exhaust, C4 is the specific heat capacity of the DOC carrier, C2 is the specific heat capacity of the exhaust pipe, C3 is the specific heat capacity of the exhaust, and T5 is the specific heat capacity of the exhaust. 目标 T5 is the target temperature for the closed-loop DPF inlet. 实测 This is the measured temperature at the DPF inlet.

[0028] Furthermore, the expression for the burner closed-loop control oil quantity is calculated as follows:

[0029] f(t) = T5 目标 -T5 实测 ;

[0030]

[0031] Among them, V pidFor closed-loop control of the burner fuel quantity, Lp is the proportional gain at the DPF inlet temperature, Li is the integral gain at the DPF inlet temperature, Ld is the derivative gain at the DPF inlet temperature, and T5 is the differential gain at the DPF inlet temperature. 目标 T5 is the target temperature for the closed-loop DPF inlet. 实测 This is the measured temperature at the DPF inlet.

[0032] Furthermore, the method for interactively controlling the fuel injection quantity based on the target temperature of the closed-loop DOC inlet, the measured temperature of the DOC inlet, the target temperature of the closed-loop DPF inlet, and the measured temperature of the DPF inlet is as follows:

[0033] A temperature threshold value is set, and the measured temperature of the DPF inlet is compared with the temperature threshold value. When the measured temperature of the DPF inlet is less than or equal to the temperature threshold value, no far-end injection correction is performed. When the measured temperature of the DPF inlet is greater than the temperature threshold value, the interactive control far-end injection quantity is calculated based on the target temperature of the closed-loop DOC inlet, the measured temperature of the DOC inlet, the target temperature of the closed-loop DPF inlet, and the measured temperature of the DPF inlet.

[0034] Furthermore, the expression for calculating the amount of fuel injected remotely under interactive control is as follows:

[0035] Vobs=P×∫(T5 target - T5 measured)×ht+Q×(T4 target - T4 measured);

[0036] Among them, T5 目标 T5 is the target temperature for the closed-loop DPF inlet. 实测 T4 is the measured temperature at the DPF inlet. 目标 The target temperature for the closed-loop DOC inlet, T4 实测 denoted as , where is the measured temperature at the DOC inlet, P is the correction factor for Vobs at the far-end injection point, ht is the time integral of the measured temperature at the DPF inlet and the target temperature at the closed-loop DOC inlet, and Q is the correction factor for the DOC inlet temperature deviation.

[0037] A system for active regeneration of a burner-assisted DPF, the system comprising,

[0038] A burner, used for injecting fuel;

[0039] The T4 temperature sensor is used to acquire the measured temperature signal at the DOC inlet.

[0040] The T5 temperature sensor is used to acquire the measured temperature signal at the DPF inlet.

[0041] The ECU is used to receive the measured temperature signals at the DOC inlet and the DPF inlet, apply the above-mentioned control method for active regeneration of the burner-assisted DPF, and control the burner based on the measured temperature signals at the DOC inlet and the DPF inlet.

[0042] Beneficial effects

[0043] The advantages of this invention are:

[0044] 1. This invention obtains the measured temperatures of the regeneration stage, DOC inlet, and DPF inlet. When the regeneration stage is the DOC heating stage, a first regeneration control strategy is triggered based on the measured temperature of the DOC inlet to obtain the total fuel quantity of the burner, and the measured temperature of the DOC inlet is adjusted according to the total fuel quantity of the burner. When the regeneration stage is the DPF regeneration stage, a second regeneration control strategy is triggered based on the measured temperatures of the DOC inlet and DPF inlet to obtain the total fuel quantity of the after-injection system, and the measured temperature of the DPF inlet is adjusted according to the total fuel quantity of the after-injection system. When the regeneration stage is the cooling stage, the burner and after-injection processes are shut off, and the throttle is fully opened. This effectively solves many problems existing in the current DPF regeneration method under low load conditions, such as low DOC inlet temperature, frequent regeneration interruption, slow regeneration heating rate, high fuel consumption, and high risk of oil dilution. It achieves efficient and stable regeneration of the DPF, improving the performance and reliability of the engine aftertreatment system.

[0045] 2. By setting a first regeneration control strategy and a second regeneration control strategy, this invention can accurately calculate the burner fuel quantity and the far-end fuel injection quantity based on the difference between the target temperature and the actual temperature, thereby achieving precise temperature control and further improving the system's performance and stability. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of the DPF regeneration system of the present invention;

[0047] Figure 2 This is a logic diagram of the first regeneration control strategy of the present invention;

[0048] Figure 3 This is a logic diagram of the second regeneration control strategy of the present invention;

[0049] Figure 4 This is a comparison chart of DPF regeneration temperatures with the burner on and off, according to the present invention.

[0050] Figure 5 This is a comparison diagram of the regeneration cycle temperature rise density under the conditions of the burner being turned on and off, according to the present invention;

[0051] Figure 6 This is a configuration diagram of the aftertreatment system for the China VII burner of the present invention.

[0052] The components are: 1-engine, 2-burner unit, 3-air control module, 4-burner control module, 5-heating unit, 6-ATS system, 7-urea injector, 8-combustion chamber, 9-fuel connection module, and 10-ignition module. Detailed Implementation

[0053] The present invention will be further described below with reference to embodiments, but this does not constitute any limitation on the present invention. Any limited modifications made by any person within the scope of the claims of the present invention are still within the scope of the claims of the present invention.

[0054] See Figures 1-6 The present invention provides a control method for active regeneration of burner-assisted DPF, such as... Figure 1 As shown, the method involves obtaining the measured temperatures of the regeneration stage, the DOC inlet, and the DPF inlet. When the regeneration stage is the DOC heating stage, the first regeneration control strategy is triggered based on the measured temperature of the DOC inlet to obtain the total oil quantity of the burner. The measured temperature of the DOC inlet is adjusted based on the total oil quantity of the burner to ensure that the temperature of the DOC inlet is within the preset high-efficiency oxidation temperature range of HC.

[0055] like Figure 2 As shown, the first regeneration control strategy is:

[0056] Set the target temperature at the closed-loop DOC inlet, obtain the burner mass, burner specific heat capacity, exhaust pipe mass, exhaust pipe specific heat capacity, exhaust specific heat capacity, and exhaust mass. Calculate the burner pre-controlled oil quantity based on the measured temperature at the DOC inlet, the target temperature at the closed-loop DOC inlet, the burner mass, burner specific heat capacity, exhaust pipe mass, exhaust specific heat capacity, exhaust specific heat capacity, and exhaust mass. Calculate the burner closed-loop control oil quantity based on the target temperature at the closed-loop DOC inlet and the measured temperature at the DOC inlet. Add the burner closed-loop control oil quantity to the burner pre-controlled oil quantity to obtain the total burner oil quantity.

[0057] The expression for calculating the pre-controlled oil quantity of the burner is:

[0058] Upre = (C1×m1 + C2×m2 + C3×m3)×(T4 target - T4 measured);

[0059] Among them, U pre Here, m1 is the pre-controlled oil quantity for the burner, m2 is the mass of the exhaust pipe, m3 is the mass of the exhaust gas, C1 is the specific heat capacity of the burner, C2 is the specific heat capacity of the exhaust pipe, C3 is the specific heat capacity of the exhaust gas, and T4 is the specific heat capacity of the exhaust gas. 目标 The target temperature for the closed-loop DOC inlet, T4 实测 This is the measured temperature at the DOC inlet.

[0060] The expression for calculating the burner closed-loop control oil quantity is:

[0061] e(t) = T4 target - T4 measured;

[0062]

[0063] Among them, U pid For closed-loop control of the burner oil quantity, Kp is the proportional gain of the burner temperature, Ki is the integral gain of the burner temperature, Kd is the derivative gain of the burner temperature, and T4... 目标 The target temperature for the closed-loop DOC inlet, T4 实测 This is the measured temperature at the DOC inlet.

[0064] When the regeneration stage is the DPF regeneration stage, the second regeneration control strategy is triggered based on the measured temperature of the DOC inlet and the measured temperature of the DPF inlet to obtain the total fuel injection quantity. The measured temperature of the DPF inlet is then adjusted based on the total fuel injection quantity.

[0065] like Figure 3 As shown, the second regeneration control strategy is:

[0066] Set the target temperature at the closed-loop DPF inlet, obtain the exhaust mass, exhaust specific heat capacity, exhaust pipe mass, exhaust specific heat capacity, DOC carrier mass, and DOC carrier specific heat capacity, and calculate the pre-control fuel quantity for remote injection based on the target temperature at the closed-loop DPF inlet, the measured temperature at the DPF inlet, the exhaust mass, exhaust specific heat capacity, exhaust pipe mass, exhaust specific heat capacity, DOC carrier mass, and DOC carrier specific heat capacity.

[0067] The burner closed-loop control oil quantity is calculated based on the target temperature of the DPF inlet and the measured temperature of the DPF inlet.

[0068] The amount of fuel injected after remote control is obtained based on the target temperature of the closed-loop DOC inlet, the measured temperature of the DOC inlet, the target temperature of the closed-loop DPF inlet, and the measured temperature of the DPF inlet.

[0069] The total fuel quantity for remote and rear injection is obtained by adding the fuel quantity controlled by the pre-control of the remote and rear injection, the fuel quantity controlled by the burner closed loop, and the fuel quantity controlled by the interactive remote and rear injection.

[0070] The expression for calculating the pre-control fuel quantity for far-field injection is:

[0071] Vpre=(C4×m4+C2×m2+C3×m3)×(T5 target-T5 measured);

[0072] Among them, V preFor the pre-control fuel quantity of the remote injection, m4 is the mass of the DOC carrier, m2 is the mass of the exhaust pipe, m3 is the mass of the exhaust, C4 is the specific heat capacity of the DOC carrier, C2 is the specific heat capacity of the exhaust pipe, C3 is the specific heat capacity of the exhaust, and T5 is the specific heat capacity of the exhaust. 目标 T5 is the target temperature for the closed-loop DPF inlet. 实测 This is the measured temperature at the DPF inlet.

[0073] The expression for the burner closed-loop control oil quantity is calculated as follows:

[0074] f(t) = T5 target - T5 measured;

[0075]

[0076] Among them, V pid For closed-loop control of the burner fuel quantity, Lp is the proportional gain at the DPF inlet temperature, Li is the integral gain at the DPF inlet temperature, Ld is the derivative gain at the DPF inlet temperature, and T5 is the differential gain at the DPF inlet temperature. 目标 T5 is the target temperature for the closed-loop DPF inlet. 实测 This is the measured temperature at the DPF inlet.

[0077] The method for interactively controlling the remote injection quantity is as follows, based on the target temperature of the closed-loop DOC inlet, the measured temperature of the DOC inlet, the target temperature of the closed-loop DPF inlet, and the measured temperature of the DPF inlet.

[0078] A temperature threshold value is set, and the measured temperature of the DPF inlet is compared with the temperature threshold value. When the measured temperature of the DPF inlet is less than or equal to the temperature threshold value, no far-end injection correction is performed. When the measured temperature of the DPF inlet is greater than the temperature threshold value, the interactive control far-end injection quantity is calculated based on the target temperature of the closed-loop DOC inlet, the measured temperature of the DOC inlet, the target temperature of the closed-loop DPF inlet, and the measured temperature of the DPF inlet.

[0079] The expression for calculating the amount of fuel injected after interactive control is as follows:

[0080] Vobs=P×∫(T5 target - T5 measured)×ht+Q×(T4 target - T4 measured);

[0081] Among them, T5 目标 T5 is the target temperature for the closed-loop DPF inlet. 实测 T4 is the measured temperature at the DPF inlet. 目标 The target temperature for the closed-loop DOC inlet, T4 实测denoted as , where is the measured temperature at the DOC inlet; P is the Vobs correction factor for the remote injection, used to adjust for the impact of DPF inlet temperature deviation; ht is the time integral of the measured temperature at the DPF inlet and the target temperature at the closed-loop DOC inlet; and Q is the correction factor for the DOC inlet temperature deviation, used to adjust for the impact of DOC inlet temperature deviation.

[0082] When the regeneration phase is the cooling phase, after regeneration is completed, the burner and the remote injection process are shut off, the throttle is fully opened, and the temperature of the DPF is cooled by increasing the exhaust flow rate and other measures to prevent thermal damage.

[0083] The burner-assisted DPF active regeneration method, by setting the formulas and parameter calculation methods in the burner fuel quantity control logic at the DOC inlet and the remote and rear fuel injection quantity control logic at the DPF inlet, can accurately calculate the total fuel injection quantity of the burner and the total fuel injection quantity at the remote and rear ends based on the difference between the target temperature and the measured temperature, as well as relevant thermodynamic parameters, thus achieving precise temperature control.

[0084] The entire control logic encompasses DOC heating and DPF regeneration, with each stage working in tandem to ensure efficient regeneration. Simultaneously, the burner control strategy further enhances system performance and stability through real-time temperature monitoring and feedback adjustments to fuel injection and airflow, as well as optimization measures for the regeneration process, such as low-load condition optimization and oil dilution risk control.

[0085] like Figure 4-5 As shown, the regeneration process is optimized, particularly under low-load conditions: by using auxiliary heating of the burner, the T4 and T5 temperatures of the DOC inlet and DPF inlet under low-load conditions are increased to avoid regeneration interruption. By adjusting the fuel injection quantity and the total fuel quantity of the burner, the DOC inlet temperature T4 and DPF inlet temperature T5 are interactively coupled and controlled, thereby improving the regeneration efficiency.

[0086] Oil dilution risk control: By optimizing the combustion process of the burner, increasing the temperature at the DOC inlet, and reducing the temperature difference between T5 and T4, the amount of oil injected after the engine is reduced, thereby reducing the risk of oil dilution and improving engine reliability.

[0087] A system for active regeneration of a burner-assisted DPF, the system comprising,

[0088] A burner is used to inject fuel.

[0089] The T4 temperature sensor is used to acquire the measured temperature signal at the DOC inlet.

[0090] The T5 temperature sensor is used to acquire the measured temperature signal at the DPF inlet.

[0091] The ECU is used to receive the measured temperature signals at the DOC inlet and the DPF inlet, apply the above-mentioned control method for active regeneration of DPF with burner assistance, and control the burner based on the measured temperature signals at the DOC inlet and the DPF inlet.

[0092] like Figure 6 As shown, the burner of the present invention includes the following main components:

[0093] Combustion chamber 8: Used to generate a high-temperature flame to provide the heat required for DOC to heat up.

[0094] Fuel connection module 9: Delivers fuel to the combustion chamber, ensuring the stability and accuracy of fuel supply.

[0095] Ignition module 10: Responsible for igniting diesel fuel in the combustion chamber to ensure the smooth progress of the combustion process.

[0096] Air control module 3: Adjusts the air flow during combustion, controls the appropriate air-fuel ratio to optimize combustion efficiency, and prevents misfire.

[0097] Burner control module 4: Through sensors and controllers, it monitors and adjusts the working status of the burner in real time to ensure the efficiency and stability of the regeneration process.

[0098] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention, and these will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. A burner-assisted DPF active regeneration control method, characterized in that, The method involves obtaining the measured temperatures of the regeneration stage, the DOC inlet, and the DPF inlet. When the regeneration stage is the DOC heating stage, a first regeneration control strategy is triggered based on the measured temperature of the DOC inlet to obtain the total oil quantity of the burner. The measured temperature of the DOC inlet is then adjusted based on the total oil quantity of the burner. When the regeneration stage is the DPF regeneration stage, the second regeneration control strategy is triggered based on the measured temperature of the DOC inlet and the measured temperature of the DPF inlet to obtain the total fuel injection quantity, and the measured temperature of the DPF inlet is adjusted based on the total fuel injection quantity. When the regeneration phase is the cooling phase, shut off the burner and the remote injection process, and fully open the throttle.

2. The control method for active regeneration of burner-assisted DPF according to claim 1, characterized in that, The first regeneration control strategy is: Set the target temperature at the closed-loop DOC inlet, obtain the burner mass, burner specific heat capacity, exhaust pipe mass, exhaust pipe specific heat capacity, exhaust specific heat capacity, and exhaust mass, and calculate the burner pre-controlled oil quantity based on the measured temperature of the DOC inlet, the target temperature of the closed-loop DOC inlet, the burner mass, the burner specific heat capacity, the exhaust pipe mass, the exhaust specific heat capacity, exhaust specific heat capacity, and exhaust mass; calculate the burner closed-loop control oil quantity based on the target temperature of the closed-loop DOC inlet and the measured temperature of the DOC inlet; add the burner closed-loop control oil quantity to the burner pre-controlled oil quantity to obtain the total burner oil quantity.

3. The control method for active regeneration of burner-assisted DPF according to claim 2, characterized in that, The expression for calculating the pre-controlled oil quantity of the burner is: U pre =(C1×m1+C2×m2+C3×m3)×(T4 目标 -T4 实测 ); Among them, U pre Here, m1 is the pre-controlled oil quantity for the burner, m2 is the mass of the exhaust pipe, m3 is the mass of the exhaust gas, C1 is the specific heat capacity of the burner, C2 is the specific heat capacity of the exhaust pipe, C3 is the specific heat capacity of the exhaust gas, and T4 is the specific heat capacity of the exhaust gas. 目标 The target temperature for the closed-loop DOC inlet, T4 实测 This is the measured temperature at the DOC inlet.

4. The control method for active regeneration of burner-assisted DPF according to claim 2, characterized in that, The expression for calculating the closed-loop control oil quantity of the burner is as follows: e(t)=T4 目标 -T4 实测 ; Among them, U pid For closed-loop control of the burner oil quantity, Kp is the proportional gain of the burner temperature, Ki is the integral gain of the burner temperature, Kd is the derivative gain of the burner temperature, and T4... 目标 The target temperature for the closed-loop DOC inlet, T4 实测 This is the measured temperature at the DOC inlet.

5. The system and control method for active regeneration of burner-assisted DPF according to claim 1, characterized in that, The second regeneration control strategy is: Set the target temperature of the closed-loop DPF inlet, obtain the mass of exhaust gas, the specific heat capacity of exhaust gas, the mass of exhaust pipe, the specific heat capacity of exhaust pipe, the mass of DOC carrier, and the specific heat capacity of DOC carrier, and calculate the pre-control fuel quantity for remote injection based on the target temperature of the closed-loop DPF inlet, the measured temperature of the DPF inlet, the mass of exhaust gas, the specific heat capacity of exhaust gas, the mass of exhaust pipe, the specific heat capacity of exhaust pipe, the mass of DOC carrier, and the specific heat capacity of DOC carrier. The burner closed-loop control oil quantity is calculated based on the target temperature of the DPF inlet and the measured temperature of the DPF inlet. The amount of fuel injected after remote control is obtained based on the target temperature of the closed-loop DOC inlet, the measured temperature of the DOC inlet, the target temperature of the closed-loop DPF inlet, and the measured temperature of the DPF inlet. The total amount of fuel injected into the far and rear injection system is obtained by adding the fuel quantity controlled by the pre-control of the far and rear injection system, the fuel quantity controlled by the burner closed loop, and the fuel quantity controlled by the interactive system.

6. The control method for active regeneration of burner-assisted DPF according to claim 5, characterized in that, The expression for calculating the pre-control fuel quantity of the far-rear injection is: IN pre =(C4×m4+C2×m2+C3×m3)×(T5 目标 -T5 实测 ); Among them, V pre For the pre-control fuel quantity of the remote injection, m4 is the mass of the DOC carrier, m2 is the mass of the exhaust pipe, m3 is the mass of the exhaust, C4 is the specific heat capacity of the DOC carrier, C2 is the specific heat capacity of the exhaust pipe, C3 is the specific heat capacity of the exhaust, and T5 is the specific heat capacity of the exhaust. 目标 T5 is the target temperature for the closed-loop DPF inlet. 实测 This is the measured temperature at the DPF inlet.

7. The control method for active regeneration of burner-assisted DPF according to claim 5, characterized in that, The expression for calculating the closed-loop control oil quantity of the burner is as follows: f(t)=T5 目标 -T5 实测 ; Among them, V pid For closed-loop control of the burner fuel quantity, Lp is the proportional gain at the DPF inlet temperature, Li is the integral gain at the DPF inlet temperature, Ld is the derivative gain at the DPF inlet temperature, and T5 is the differential gain at the DPF inlet temperature. 目标 T5 is the target temperature for the closed-loop DPF inlet. 实测 This is the measured temperature at the DPF inlet.

8. The control method for active regeneration of burner-assisted DPF according to claim 5, characterized in that, The method for interactively controlling the remote injection quantity is as follows, based on the target temperature of the closed-loop DOC inlet, the measured temperature of the DOC inlet, the target temperature of the closed-loop DPF inlet, and the measured temperature of the DPF inlet. A temperature threshold value is set, and the measured temperature of the DPF inlet is compared with the temperature threshold value. When the measured temperature of the DPF inlet is less than or equal to the temperature threshold value, no far-end injection correction is performed. When the measured temperature of the DPF inlet is greater than the temperature threshold value, the interactive control far-end injection quantity is calculated based on the target temperature of the closed-loop DOC inlet, the measured temperature of the DOC inlet, the target temperature of the closed-loop DPF inlet, and the measured temperature of the DPF inlet.

9. The control method for active regeneration of burner-assisted DPF according to claim 8, characterized in that, The expression for calculating the amount of fuel injected remotely under the interactive control is as follows: Vobs=P×∫(T5 目标 -T5 实测 )×ht+Q×(T4 目标 -T4 实测 ); Among them, T5 目标 T5 is the target temperature for the closed-loop DPF inlet. 实测 T4 is the measured temperature at the DPF inlet. 目标 The target temperature for the closed-loop DOC inlet, T4 实测 denoted as , where is the measured temperature at the DOC inlet, P is the correction factor for Vobs at the far-end injection point, ht is the time integral of the measured temperature at the DPF inlet and the target temperature at the closed-loop DOC inlet, and Q is the correction factor for the DOC inlet temperature deviation.

10. A system for burner-assisted active regeneration of DPF, characterized in that, The system includes, A burner, used for injecting fuel; The T4 temperature sensor is used to acquire the measured temperature signal at the DOC inlet. The T5 temperature sensor is used to acquire the measured temperature signal at the DPF inlet. The ECU is used to receive the measured temperature signal at the DOC inlet and the measured temperature signal at the DPF inlet, and to apply the control method for active regeneration of DPF assisted by a burner as described in any one of claims 1-9, and to control the burner based on the measured temperature signals at the DOC inlet and the measured temperature signals at the DPF inlet.

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