Method and device for improving regeneration efficiency and vehicle
By combining low-temperature passive and high-temperature active regeneration modes in the exhaust gas treatment device, the problem of DDPF regeneration efficiency and cost being mutually exclusive is solved, achieving efficient and stable exhaust gas treatment results.
Patent Information
- Application Number
- CN202511035288.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-25
- Publication Date
- 2025-11-21
AI Technical Summary
Existing integrated oxidation traps (DDPFs) have shortcomings in regeneration performance, especially in low-temperature conditions where the reaction rate is low and active regeneration requires high temperatures, resulting in additional fuel consumption. They cannot simultaneously achieve both regeneration efficiency and cost.
By combining an integrated oxidation trap and first and second selective catalytic reduction systems in the exhaust gas treatment device, and through comprehensive judgment of low-temperature passive regeneration mode and high-temperature active regeneration mode, the regeneration strategy is optimized, including controlling engine nitrogen oxide emissions, fuel injection and temperature management, to achieve multi-level regeneration.
Without increasing operating costs, it improves regeneration efficiency, reduces the possibility of damage to the integrated oxidation trap, and enhances the stability and efficiency of the exhaust gas treatment system.
Smart Images
Figure CN120990727A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of engine aftertreatment technology, specifically to a method, apparatus, and vehicle for improving regeneration efficiency. Background Technology
[0002] With increasingly stringent vehicle emission regulations, the integration and efficiency of exhaust aftertreatment systems have become a key research focus. Traditional exhaust treatment typically employs a separate oxidation catalytic converter (DOC) and particulate filter (DPF) connected in series, but this structure suffers from problems such as large size, high cost, and complex exhaust thermal management. To reduce system size and cost, an integrated oxidation filter (DDPF) solution is adopted, in which the DOC catalyst is coated onto a DPF support. However, existing DDPF technology still has significant shortcomings in regeneration performance: in passive regeneration, the reaction rate between NO2 and soot is low, especially at low temperatures where effective regeneration is difficult to achieve; while active regeneration often requires higher temperatures, leading to additional fuel consumption. Therefore, DDPF technology cannot simultaneously achieve both regeneration efficiency and regeneration cost. Summary of the Invention
[0003] To address the aforementioned technical problems, this application is proposed. Embodiments of this application provide a method, apparatus, and vehicle for improving regeneration efficiency without increasing operating costs.
[0004] According to a first aspect of this application, a method for improving regeneration efficiency is provided, applied to an exhaust gas treatment device. The exhaust gas treatment device includes an integrated oxidation trap, a first selective catalytic reduction system, and a second selective catalytic reduction system. The first selective catalytic reduction system is disposed upstream of the integrated oxidation trap, and the second selective catalytic reduction system is disposed downstream of the integrated oxidation trap. The method for improving regeneration efficiency includes: entering a low-temperature passive regeneration mode when the real-time carbon load of the integrated oxidation trap is greater than a first preset carbon load, the average increase in carbon load is greater than a preset average, and the actual conversion efficiency of the first selective catalytic reduction system and the actual conversion efficiency of the second selective catalytic reduction system meet the requirements for low-temperature passive regeneration; obtaining the current carbon load of the integrated oxidation trap when the low-temperature passive regeneration mode ends; and entering a high-temperature active regeneration mode when the current carbon load is greater than a second preset carbon load; wherein the second preset carbon load is greater than the first preset carbon load.
[0005] One possible approach to entering a low-temperature passive regeneration mode includes: controlling and increasing the original nitrogen oxide emission concentration of the engine, limiting the opening of the intake throttle valve, and implementing a secondary post-injection fuel strategy to raise the current temperature, thereby reducing the increase in carbon load and increasing the passive regeneration reaction rate.
[0006] As one possible implementation, before obtaining the current carbon load of the integrated oxidation trap at the end of the low-temperature passive regeneration mode, the method for improving regeneration efficiency further includes: in the low-temperature passive regeneration mode, if the current carbon load of the integrated oxidation trap is lower than a third preset carbon load, ending the low-temperature passive regeneration mode; wherein the third preset carbon load is less than the first preset carbon load; or in the low-temperature passive regeneration mode, if the passive regeneration time of the low-temperature passive regeneration mode is greater than or equal to a preset time, ending the low-temperature passive regeneration mode.
[0007] As one possible implementation, entering the high-temperature active regeneration mode includes: controlling the upstream temperature of the first selective catalytic reduction system to reach a first preset temperature; wherein the first preset temperature includes the ignition temperature of hydrocarbons; controlling the downstream temperature of the integrated oxidation trap to reach a second preset temperature; and calculating the corrected oil quantity based on the difference between the real-time downstream temperature of the integrated oxidation trap and the second preset temperature.
[0008] As one possible implementation, entering the high-temperature active regeneration mode further includes: determining the thermal melt of the exhaust gas based on the upstream temperature of the first selective catalytic reduction system; determining the hydrocarbon conversion efficiency of the integrated oxidation trap based on the upstream temperature of the first selective catalytic reduction system and the exhaust gas mass flow rate; calculating the target heat demand based on the upstream temperature of the first selective catalytic reduction system, the exhaust gas mass flow rate, the thermal melt of the exhaust gas, and the preset regeneration temperature value; and calculating the hydrocarbon mass flow rate based on the target heat demand, calorific value, and the hydrocarbon conversion efficiency of the integrated oxidation trap.
[0009] As one possible implementation, entering the high-temperature active regeneration mode also includes: determining the regeneration injection quantity of the high-temperature active regeneration mode based on the mass flow rate of the hydrocarbon and the correction oil quantity.
[0010] As one possible implementation, after entering the high-temperature active regeneration mode when the current carbon loading is greater than the second preset carbon loading, the method to improve regeneration efficiency further includes: obtaining the target temperature percentage time, the timing time of the temperature control phase, and the pressure difference carbon loading reduction rate during the high-temperature active regeneration mode; wherein, the pressure difference carbon loading reduction rate is obtained by dividing the difference in pressure difference carbon loading at the start and end of the high-temperature active regeneration mode by the duration of the high-temperature active regeneration mode; when the target temperature percentage time is greater than or equal to the first preset limit, the timing time of the temperature control phase is greater than or equal to the second preset limit, and the pressure difference carbon loading reduction rate is greater than or equal to the preset threshold, a regeneration success prompt is issued.
[0011] As a possible implementation method, the method to improve regeneration efficiency also includes: when the duration of the high-temperature active regeneration mode is greater than or equal to a preset duration and the reduction rate of carbon load due to pressure difference is less than the preset threshold, issuing a regeneration failure prompt; and based on the regeneration failure prompt, issuing a parking regeneration request message.
[0012] According to a second aspect of this application, a device for improving regeneration efficiency is provided, applied to an exhaust gas treatment device. The exhaust gas treatment device includes an integrated oxidation trap, a first selective catalytic reduction system, and a second selective catalytic reduction system. The first selective catalytic reduction system is disposed upstream of the integrated oxidation trap, and the second selective catalytic reduction system is disposed downstream of the integrated oxidation trap. The device for improving regeneration efficiency includes: a low-temperature passive regeneration module, which enters a low-temperature passive regeneration mode when the real-time carbon load of the integrated oxidation trap is greater than a first preset carbon load, the average increase in carbon load is greater than a preset average, and the actual conversion efficiency of the first selective catalytic reduction system and the actual conversion efficiency of the second selective catalytic reduction system meet the requirements of low-temperature passive regeneration; an acquisition module, which acquires the current carbon load of the integrated oxidation trap when the low-temperature passive regeneration mode ends; and a high-temperature active regeneration module, which enters a high-temperature active regeneration mode when the current carbon load is greater than a second preset carbon load; wherein the second preset carbon load is greater than the first preset carbon load.
[0013] According to a third aspect of this application, a vehicle is provided, comprising: an exhaust gas treatment device; the exhaust gas treatment device includes an integrated oxidation trap, a first selective catalytic reduction system, and a second selective catalytic reduction system, wherein the first selective catalytic reduction system is disposed upstream of the integrated oxidation trap, and the second selective catalytic reduction system is disposed downstream of the integrated oxidation trap; and a device for improving regeneration efficiency as described in the second aspect or any implementation thereof, wherein the device for improving regeneration efficiency is communicatively connected to the exhaust gas treatment device.
[0014] The method, apparatus, and vehicle for improving regeneration efficiency provided in this application comprehensively determine whether to enter a low-temperature passive regeneration mode or a high-temperature active regeneration mode based on the increase in carbon load and the real-time conversion efficiency of the selective catalytic reduction system. This effectively balances the resource allocation for regeneration in both modes, achieving an increased passive regeneration reaction rate in the low-temperature passive regeneration mode to effectively balance the carbon load. If the carbon load does not reach the expected reduction after the low-temperature passive regeneration mode, the high-temperature active regeneration mode is used to complete the active regeneration, realizing a multi-layer regeneration strategy. This improves regeneration efficiency without increasing operating costs and reduces the possibility of damaging the integrated oxidation trap. Attached Figure Description
[0015] The above and other objects, features, and advantages of this application will become more apparent from the more detailed description of the embodiments of this application in conjunction with the accompanying drawings. The drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof. In the drawings, the same reference numerals generally represent the same components or steps.
[0016] Figure 1 This is a schematic diagram of the structure of a vehicle exhaust treatment device provided in an exemplary embodiment of this application.
[0017] Figure 2 This is a flowchart illustrating a method for improving regeneration efficiency provided in an exemplary embodiment of this application.
[0018] Figure 3 This is a schematic diagram of the structure of an apparatus for improving regeneration efficiency provided in an exemplary embodiment of this application.
[0019] Figure 4 This is a structural diagram of an electronic device provided in an exemplary embodiment of this application. Detailed Implementation
[0020] Hereinafter, exemplary embodiments according to this application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments of this application. It should be understood that this application is not limited to the exemplary embodiments described herein.
[0021] With increasing global emphasis on environmental protection, harmful substances in automobile engine exhaust emissions, such as particulate matter (PM), nitrogen oxides (NOx), carbon monoxide (CO), and hydrocarbons (HC), have become one of the main sources of air pollution. To meet increasingly stringent emission requirements, engine exhaust aftertreatment technologies have been extensively researched and applied. Currently, common engine exhaust aftertreatment systems mainly include diesel oxide catalysts (DOC), diesel particulate filters (DPF), and selective catalytic reduction (SCR) technologies. The DOC, installed before the DPF, is used to oxidize NO in the exhaust to NO2, while simultaneously increasing the exhaust temperature to assist the normal operation of the DPF and SCR. The DOC consists of a honeycomb ceramic carrier coated with a noble metal catalyst (such as Pt). Its purpose is to lower the activation energy of the chemical reactions of HC, CO, and SOF in the engine exhaust, allowing these substances to react with oxygen in the exhaust at a lower temperature and ultimately convert into CO2 and H2O. Diesel Particulate Filters (DPFs) are used to filter and capture particulate matter in engine exhaust through diffusion, deposition, and impaction mechanisms. When the captured particulate matter reaches a certain level, passive or active regeneration is required to restore the DPF's particulate matter capture capability. As exhaust flows through the DPF, particulate matter is captured within the filter element, while the cleaner exhaust is released into the atmosphere. Currently, to reduce the size and cost of DOC / DPF systems and further improve diesel engine exhaust gas treatment efficiency and system integration, integrated diesel oxidation catalyst and diesel particulate filter technology has emerged, integrating them into an integrated oxidation filter (DDPF). This DDPF uses separate coatings of DOC and DPF catalyst formulations, combining the functions of both. This integrated design not only reduces the size and weight of the exhaust aftertreatment system, lowers installation complexity and cost, but also optimizes the exhaust gas flow path within the system, improving the efficiency of catalytic reaction and particulate matter capture.
[0022] However, DDPF technology faces a key challenge in practical applications: DPF regeneration. During particulate matter capture, the accumulation of particulate matter leads to increased exhaust back pressure, impacting engine performance and fuel economy. Therefore, periodic DPF regeneration is necessary, achieved through high-temperature combustion to oxidize and remove the captured particulate matter. The DOC catalyst in DDPF plays a crucial role in this regeneration process, promoting the oxidation reaction and lowering the regeneration temperature. However, achieving efficient and cost-effective DDPF regeneration remains a critical bottleneck hindering the widespread adoption of this technology.
[0023] To reduce the size and cost of DOC / DPF systems Figure 1This is a schematic diagram of the structure of a vehicle exhaust treatment device provided in an exemplary embodiment of this application, so as to... Figure 1 For example, the exhaust gas treatment device in a vehicle can be arranged as follows: SCR1 (first selective catalytic reduction system), DDPF (integrated oxidizer), and SCR2 (second selective catalytic reduction system) connected in sequence. The first selective catalytic reduction system is located upstream of the integrated oxidizer, and the second selective catalytic reduction system is located downstream of the integrated oxidizer. A temperature sensor T1, a NOx1 sensor (first nitrogen oxide sensor), and Inj1 (first urea injector) are installed before SCR1; a temperature sensor T2 and a NOx2 sensor (second nitrogen oxide sensor) are installed before DDPF; a temperature sensor T3 and Inj2 (second urea injector) are installed after DDPF; and a NOx3 sensor (third nitrogen oxide sensor) is installed after SCR2. ΔP is the differential pressure sensor across the DDPF. The NOx1 sensor detects the oxygen concentration before entering SCR1, the NOx2 sensor detects the oxygen concentration output by SCR1, and the NOx3 sensor detects the oxygen concentration output by SCR2. Soot, NOx, and fuel emitted from the engine are fed into the inlet of the DDPF device, enabling the capture of soot and the oxidation of fuel to raise the temperature. Applying the regeneration efficiency improvement device of this application to a vehicle's exhaust gas treatment system and implementing the method for improving regeneration efficiency increases operating costs without increasing regeneration efficiency, reduces the possibility of damage to the integrated oxidation trap, and thus improves the operational stability of the vehicle's exhaust gas treatment system.
[0024] based on Figure 1 The exhaust gas treatment device structure shown is designed to address the issue of simultaneously achieving high DDPF regeneration efficiency and cost. Figure 2 This is a schematic flowchart illustrating a method for improving regeneration efficiency provided in an exemplary embodiment of this application. Figure 2 For example, when the real-time carbon loading of the integrated oxidation trap is greater than the first preset carbon loading, the average increase in carbon loading is greater than the preset average, and the actual conversion efficiency of the first selective catalytic reduction system and the actual conversion efficiency of the second selective catalytic reduction system meet the requirements for low-temperature passive regeneration, the system enters the low-temperature passive regeneration mode (see [link]). Figure 2 (S210). At the end of the low-temperature passive regeneration mode, obtain the current carbon load of the integrated oxidation trap (see S210). Figure 2 (S220). When the current carbon loading is greater than the second preset carbon loading, it enters the high-temperature active regeneration mode (see S220). Figure 2(S230). The second preset carbon load is greater than the first preset carbon load. Based on the real-time carbon load, it is first determined whether the conditions for entering the low-temperature passive regeneration mode are met. If so, the low-temperature passive regeneration mode is entered. Passive regeneration does not require additional energy consumption and has advantages such as low energy consumption, system simplicity, and low cost. Furthermore, it can continue during normal engine operation, effectively reducing the frequency of active regeneration and minimizing its impact on engine performance. After the low-temperature passive regeneration mode ends, the current carbon load is then assessed. That is, based on the regeneration effect of the low-temperature passive regeneration mode, it is further determined whether further regeneration is needed. If the current carbon load is too high, to protect the integrated oxidation trap, the high-temperature active regeneration mode is entered for regeneration processing. This ensures complete oxidation and combustion of particulate matter, achieving a multi-stage regeneration strategy. This achieves more efficient passive regeneration and lower energy consumption active regeneration without significantly increasing costs.
[0025] The following text combines Figure 2 The method for improving regeneration efficiency provided in the embodiments of this application will be described in more detail.
[0026] In S210, when the real-time carbon loading of the integrated oxidation trap is greater than the first preset carbon loading, the average increase in carbon loading is greater than the preset average, and the actual conversion efficiency of the first selective catalytic reduction system and the actual conversion efficiency of the second selective catalytic reduction system meet the requirements of low-temperature passive regeneration, the system enters the low-temperature passive regeneration mode.
[0027] In some embodiments, a first preset carbon loading (e.g., 3 g / L), a preset average value, and a conversion efficiency limit for the selective catalytic reduction system can be set based on experience and the equipment capacity of the integrated oxidant trap. When the real-time carbon loading is greater than the first preset carbon loading, the average increase in carbon loading is greater than the preset average value, and the actual conversion efficiency of the first selective catalytic reduction system and the actual conversion efficiency of the second selective catalytic reduction system exceed the conversion efficiency limit (i.e., meeting the low-temperature passive regeneration requirement), and no related faults occur in the nitrogen oxide sensor (e.g., nitrogen oxide signal deviation exceeding the lower limit and upstream nitrogen oxide concentration being too low), a comprehensive judgment is made to enter the low-temperature passive regeneration mode (e.g., 300°C passive regeneration mode).
[0028] In some embodiments, the average increase in carbon load is calculated over a preset time period (which can be chosen according to actual needs) that is closest to the current carbon load. The increase rate of carbon load (within the preset time period) can be obtained by dividing the average increase in carbon load by the preset time period.
[0029] As one possible implementation method, combined Figure 1The actual conversion efficiency of the first selective catalytic reduction system can be calculated as follows: The mass flow rates of the two nitrogen oxide sensors (NOx1 and NOx2 sensors) before and after the SCR1 (first selective catalytic reduction system) are integrated. When the cumulative NOx mass flowing through the SCR1 exceeds a certain NOx mass limit, the conversion efficiency of the SCR1 is calculated once, and this is considered an efficiency window, which is taken as the actual conversion efficiency of the first selective catalytic reduction system. To make the calibration of the NOx mass limit more flexible, the NOx mass limit is obtained by referring to a table based on the temperature T1 before the SCR1 (measured by temperature sensor T1) and the exhaust gas flow rate.
[0030] As one possible implementation method, combined Figure 1 The actual conversion efficiency of the second selective catalytic reduction system can be calculated as follows: The mass flow rates of the two nitrogen oxide sensors (NOx2 and NOx3 sensors) before and after the SCR2 (first selective catalytic reduction system) are integrated. When the cumulative NOx mass flowing through the SCR2 exceeds a certain NOx mass limit, the conversion efficiency of the SCR2 is calculated once, and this is considered an efficiency window, which is taken as the actual conversion efficiency of the second selective catalytic reduction system. To make the calibration of the NOx mass limit more flexible, the NOx mass limit is obtained by referring to a table based on the temperature T3 before the SCR2 (measured by temperature sensor T3) and the exhaust gas flow rate.
[0031] In some embodiments, after entering the low-temperature passive regeneration mode, measures such as controlling and increasing the original nitrogen oxide emission concentration of the engine, limiting the opening of the intake throttle valve, and implementing a secondary post-injection fuel strategy to increase the current temperature are taken to reduce the growth of carbon load and increase the passive regeneration reaction rate, effectively balancing the carbon load and extending the active regeneration cycle.
[0032] As one possible implementation, the carbon load growth rate can be calculated based on the power window. If the average carbon load growth rate (overall life cycle) and the current carbon load growth rate (several windows) are greater than the growth rate limit, and the actual conversion efficiency of the first selective catalytic reduction system and the actual conversion efficiency of the second selective catalytic reduction system meet the low-temperature passive regeneration requirements, that is, the actual conversion efficiency of the first selective catalytic reduction system and the actual conversion efficiency of the second selective catalytic reduction system are normal and exceed the conversion efficiency limit, the original emissions of particulate matter (smoke) can be reduced through combustion optimization (such as increasing combustion temperature and improving fuel injection strategy), thereby increasing the NOx emissions at the engine outlet within a controllable range.
[0033] In some embodiments, the termination condition for the low-temperature passive regeneration mode can be: in the low-temperature passive regeneration mode, the current carbon load of the integrated oxidation trap is lower than a third preset carbon load, thus ending the low-temperature passive regeneration mode; wherein the third preset carbon load is less than a first preset carbon load; or in the low-temperature passive regeneration mode, the passive regeneration time is greater than or equal to a preset time, thus ending the low-temperature passive regeneration mode. That is, when the current carbon load is lower than the third preset carbon load, it is determined that regeneration has been completed through the low-temperature passive regeneration mode, and the low-temperature passive regeneration mode ends. However, if the low-temperature passive regeneration mode ends because the passive regeneration time is greater than or equal to the preset time, it may be due to the failure of the low-temperature passive regeneration mode, where the carbon load did not decrease to the successfully regenerated carbon load within the preset time. Based on this, it may be necessary to execute a subsequent high-temperature active regeneration mode to protect the DDPF.
[0034] In some embodiments, the temperature of the low-temperature passive regeneration mode can be selected as 300℃-400℃.
[0035] In S220, upon completion of the low-temperature passive regeneration mode, the current carbon load of the integrated oxidation trap is acquired. To protect the DDPF, if the current carbon load is too high, high-temperature active regeneration is required to raise the exhaust gas temperature above the particulate ignition temperature, thereby achieving particulate oxidation and combustion.
[0036] In S230, when the current carbon load is greater than the second preset carbon load, it enters the high-temperature active regeneration mode.
[0037] The second preset carbon loading is greater than the first preset carbon loading. The high-temperature active regeneration mode is only activated when low-temperature passive regeneration fails, ensuring complete oxidation and combustion of particulate matter and avoiding thermal damage to the DPF support and DOC catalyst caused by frequent high-temperature active regeneration, thus shortening their service life.
[0038] In some embodiments, when the first preset carbon loading is 3 g / L, the second preset carbon loading can be 5 g / L. When the carbon loading reaches 3 g / L, a low-temperature passive regeneration mode is triggered. If the effect of the low-temperature passive regeneration mode is not good, when the carbon loading rises to 5 g / L, a high-temperature active regeneration mode is triggered to achieve two-stage regeneration. The low-energy-consumption and low-cost low-temperature passive regeneration mode is used first, and the high-temperature active regeneration mode is activated when necessary to ensure the regeneration effect, maintain the filtration performance of DDPF and ensure safe use.
[0039] In some embodiments, the high-temperature active regeneration mode may include: controlling the upstream temperature of the first selective catalytic reduction system to reach a first preset temperature; wherein the first preset temperature includes the ignition temperature of hydrocarbons; controlling the downstream temperature of the integrated oxidation trap to reach a second preset temperature; and calculating a correction fuel quantity based on the difference between the real-time downstream temperature of the integrated oxidation trap and the second preset temperature. Next, based on the upstream temperature of the first selective catalytic reduction system, the exhaust gas melt temperature is determined; based on the upstream temperature of the first selective catalytic reduction system and the exhaust gas mass flow rate, the hydrocarbon conversion efficiency of the integrated oxidation trap is determined; based on the upstream temperature of the first selective catalytic reduction system, the exhaust gas mass flow rate, the exhaust gas melt temperature, and the preset regeneration temperature value, a target heat requirement is calculated; based on the target heat requirement, calorific value, and the hydrocarbon conversion efficiency of the integrated oxidation trap, the hydrocarbon mass flow rate is calculated. Finally, based on the hydrocarbon mass flow rate and the correction fuel quantity, the regeneration fuel injection quantity for the high-temperature active regeneration mode is determined.
[0040] As one possible implementation method, the 600℃ high-temperature active regeneration control can first control the upstream temperature of DDPF (the actual temperature measured by temperature sensor T2) to above the ignition temperature of HC (hydrocarbons) through thermal management measures such as intake throttle valve and fuel after injection 2. Then, the downstream temperature of DDPF can be increased to 600℃ through in-cylinder after injection 1. Rapid carbon removal is achieved through HC injection. The downstream temperature setpoint of DDPF is 600℃ obtained by referring to MAP based on the upstream temperature of DDPF and exhaust gas flow. The downstream temperature measurement value T3 of DDPF (the actual temperature measured by temperature sensor T3) is used as the feedback value for closed-loop control. The deviation between the downstream temperature setpoint of DDPF and the downstream temperature of DDPF T3 is used as the input. Using a PID controller, the corrected fuel quantity is obtained in the closed loop.
[0041] The heat Q to be released is calculated using the heat formula: Q = c × m × Δt. In the formula, Q represents the heat to be released, c represents the exhaust mass flow rate, m represents the exhaust heat melt, and Δt represents the difference between the set value of the regeneration temperature (600℃) and the measured value of the upstream temperature of the DDPF (the actual temperature measured by the temperature sensor T2). Based on the upstream temperature of the DDPF, the exhaust heat melt is obtained by looking up the CUR (CUR is essentially a calibrated and standardized table or function relationship that stores the correspondence between exhaust heat melt and parameters such as the upstream temperature of the DPF under different engine operating conditions. The data is obtained through a large number of engine bench tests and actual road tests, reflecting the exhaust characteristics of the engine under various conditions). Based on the upstream temperature of the DDPF and the exhaust gas mass flow rate, the HC conversion efficiency in the DDPF is obtained by looking up the MAP. The feedforward calculation q = Q / (calorific value × HC conversion efficiency in the DDPF) is used, where q represents the HC mass flow rate, Q represents the heat to be released, and calorific value represents the lower heating value of the fuel (or HC). In order to provide sufficient heat Q to heat the DDPF, the conversion efficiency of DOC to HC needs to be considered, thereby calculating the HC mass flow rate q that needs to be injected into the exhaust. After calculating the mass flow rate and corrected fuel quantity of hydrocarbons, the smaller value between the mass flow rate and corrected fuel quantity of hydrocarbons is selected as the final regeneration injection quantity.
[0042] During the high-temperature active regeneration mode, a regeneration performance assessment is performed to obtain the target temperature percentage time, the timing of the temperature control phase, and the pressure differential carbon loading reduction rate. The pressure differential carbon loading reduction rate is obtained by dividing the difference in pressure differential carbon loading at the start and end of the high-temperature active regeneration mode by the duration of the high-temperature active regeneration mode. When the target temperature percentage time is greater than or equal to a first preset limit, the timing of the temperature control phase is greater than or equal to a second preset limit, and the pressure differential carbon loading reduction rate is greater than or equal to a preset threshold, a regeneration success notification is issued.
[0043] As one possible implementation, when the actual downstream temperature of the integrated oxidation trap (e.g.) Figure 1 If the real-time temperature measured by the medium temperature sensor T3 is within the target temperature b℃ (e.g., 30℃) for a period of time that is greater than or equal to the first preset limit, and the timing time of the temperature control stage is greater than or equal to the second preset limit, and the carbon load reduction rate of the pressure difference is greater than or equal to the preset threshold, then the regeneration efficiency is evaluated as high, and the regeneration is considered successful, exiting the high-temperature active regeneration mode.
[0044] In some embodiments, when the duration of the high-temperature active regeneration mode is greater than or equal to a preset duration and the rate of reduction of carbon load due to pressure difference is less than a preset threshold, the regeneration efficiency is assessed as low, the regeneration is considered unsuccessful, a regeneration failure prompt is issued, and based on the regeneration failure prompt, a parking regeneration request message is issued to promptly remind the user to perform parking regeneration and avoid damage to the integrated oxidation trap.
[0045] Figure 3 This is a schematic diagram of the structure of an apparatus for improving regeneration efficiency provided in an exemplary embodiment of this application, as shown below. Figure 3 As shown, the device 3 for improving regeneration efficiency includes: a low-temperature passive regeneration module 31, which enters the low-temperature passive regeneration mode when the real-time carbon load of the integrated oxidation trap is greater than the first preset carbon load, the average increase in carbon load is greater than the preset average, and the actual conversion efficiency of the first selective catalytic reduction system and the actual conversion efficiency of the second selective catalytic reduction system meet the requirements of low-temperature passive regeneration; an acquisition module 32, which acquires the current carbon load of the integrated oxidation trap when the low-temperature passive regeneration mode ends; and a high-temperature active regeneration module 33, which enters the high-temperature active regeneration mode when the current carbon load is greater than the second preset carbon load; wherein the second preset carbon load is greater than the first preset carbon load.
[0046] As one possible implementation, the low-temperature passive regeneration module 31 can be configured to: control and increase the original nitrogen oxide emission concentration of the engine, limit the opening of the intake throttle valve, and implement a secondary post-injection fuel strategy to increase the current temperature, so as to reduce the increase in carbon load and increase the passive regeneration reaction rate.
[0047] As one possible implementation, the device 3 for improving regeneration efficiency can be configured such that: in the low-temperature passive regeneration mode, the current carbon load of the integrated oxidation trap is lower than the third preset carbon load, and the low-temperature passive regeneration mode ends; wherein the third preset carbon load is less than the first preset carbon load; or in the low-temperature passive regeneration mode, the passive regeneration time of the low-temperature passive regeneration mode is greater than or equal to the preset time, and the low-temperature passive regeneration mode ends.
[0048] As one possible implementation, the high-temperature active regeneration module 33 can be configured to: control the upstream temperature of the first selective catalytic reduction system to reach a first preset temperature; wherein the first preset temperature includes the ignition temperature of hydrocarbons; control the downstream temperature of the integrated oxidation trap to reach a second preset temperature; and calculate the corrected oil quantity based on the difference between the real-time downstream temperature of the integrated oxidation trap and the second preset temperature.
[0049] As one possible implementation, the high-temperature active regeneration module 33 can also be configured to: determine the thermal melt of the exhaust gas based on the upstream temperature of the first selective catalytic reduction system; determine the hydrocarbon conversion efficiency of the integrated oxidation trap based on the upstream temperature of the first selective catalytic reduction system and the exhaust gas mass flow rate; calculate the target heat demand based on the upstream temperature of the first selective catalytic reduction system, the exhaust gas mass flow rate, the thermal melt of the exhaust gas, and the preset regeneration temperature value; and calculate the hydrocarbon mass flow rate based on the target heat demand, calorific value, and the hydrocarbon conversion efficiency of the integrated oxidation trap.
[0050] As one possible implementation, the high-temperature active regeneration module 33 can also be configured to determine the regeneration injection quantity of the high-temperature active regeneration mode based on the mass flow rate of hydrocarbons and the correction oil quantity.
[0051] As one possible implementation, the device 3 for improving regeneration efficiency can be configured to: acquire the target temperature percentage time, the timing time of the temperature control phase, and the differential pressure carbon loading reduction rate during the high-temperature active regeneration mode; wherein, the differential pressure carbon loading reduction rate is obtained by dividing the difference in differential pressure carbon loading at the start and end of the high-temperature active regeneration mode by the duration of the high-temperature active regeneration mode; when the target temperature percentage time is greater than or equal to a first preset limit, the timing time of the temperature control phase is greater than or equal to a second preset limit, and the differential pressure carbon loading reduction rate is greater than or equal to a preset threshold, a regeneration success prompt is issued.
[0052] As one possible implementation, the device 3 for improving regeneration efficiency can also be configured to: issue a regeneration failure prompt when the duration of the high-temperature active regeneration mode is greater than or equal to a preset duration and the reduction rate of carbon load due to pressure difference is less than a preset threshold; and issue a parking regeneration request based on the regeneration failure prompt.
[0053] An electronic device includes: a processor; a memory for storing processor-executable instructions; and a processor for executing the method for improving regeneration efficiency provided in the embodiments of this application.
[0054] Below, for reference Figure 4 This application describes an electronic device according to embodiments thereof. The electronic device may be either or both of a first device and a second device, or a standalone device independent of them, which may communicate with the first device and the second device to receive acquired input signals from them.
[0055] Figure 4 A block diagram of an electronic device according to an embodiment of this application is illustrated.
[0056] like Figure 4As shown, the electronic device 40 includes one or more processors 41 and a memory 42.
[0057] The processor 41 may be a central processing unit (CPU) or other form of processing unit with data processing and / or instruction execution capabilities, and may control other components in the electronic device 40 to perform desired functions.
[0058] The memory 42 may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory. The non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 41 may execute the program instructions to implement the methods for improving regeneration efficiency and / or other desired functions described in the various embodiments of this application above. Various contents such as input signals, signal components, and noise components may also be stored in the computer-readable storage medium.
[0059] In one example, the electronic device 40 may also include an input device 43 and an output device 44, which are interconnected via a bus system and / or other forms of connection mechanism (not shown).
[0060] When the electronic device is a standalone device, the input device 43 can be a communication network connector for receiving the collected input signals from the first device and the second device.
[0061] In addition, the input device 43 may also include, for example, a keyboard, a mouse, etc.
[0062] The output device 44 can output various information to the outside, including determined distance information, direction information, etc. The output device 44 may include, for example, a display, a speaker, a printer, and a communication network and its connected remote output devices, etc.
[0063] Of course, for the sake of simplicity, Figure 4 Only some of the components of the electronic device 40 relevant to this application are shown in this illustration; components such as buses, input / output interfaces, etc., are omitted. In addition, the electronic device 40 may include any other suitable components depending on the specific application.
[0064] The computer program product can be written in any combination of one or more programming languages to perform the operations of the embodiments of this application. The programming languages include object-oriented programming languages such as Java and C++, as well as conventional procedural programming languages such as C or similar languages. The program code can be executed entirely on the user's computing device, partially on the user's computing device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server.
[0065] A computer-readable storage medium stores a computer program for executing the method for improving regeneration efficiency described in the embodiments provided in this application.
[0066] The computer-readable storage medium may be any combination of one or more readable media. A readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may, for example, include, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatuses, or devices, or any combination thereof. More specific examples of readable storage media (a non-exhaustive list) include: electrical connections having one or more wires, portable disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.
[0067] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.
Claims
1. A method for improving regeneration efficiency, characterized in that, It is applied to exhaust gas treatment devices, which include an integrated oxidation trap, a first selective catalytic reduction system and a second selective catalytic reduction system. The first selective catalytic reduction system is installed upstream of the integrated oxidation trap, and the second selective catalytic reduction system is installed downstream of the integrated oxidation trap. Methods to improve regeneration efficiency include: When the real-time carbon load of the integrated oxidation trap is greater than the first preset carbon load, the average increase in carbon load is greater than the preset average, and the actual conversion efficiency of the first selective catalytic reduction system and the actual conversion efficiency of the second selective catalytic reduction system meet the requirements of low-temperature passive regeneration, the system enters the low-temperature passive regeneration mode. When the low-temperature passive regeneration mode ends, the current carbon load of the integrated oxidation trap is obtained; When the current carbon load is greater than the second preset carbon load, the system enters the high-temperature active regeneration mode; wherein the second preset carbon load is greater than the first preset carbon load.
2. The method for improving regeneration efficiency according to claim 1, characterized in that, Entering the low-temperature passive regeneration mode includes: Controlling the increase in the initial nitrogen oxide emission concentration of the engine, limiting the opening of the intake throttle valve, and implementing a secondary post-injection fuel strategy to increase the current temperature can reduce the increase in carbon load and improve the passive regeneration reaction rate.
3. The method for improving regeneration efficiency according to claim 1, characterized in that, Before obtaining the current carbon load of the integrated oxidation trap at the end of the low-temperature passive regeneration mode, the method for improving regeneration efficiency further includes: In the low-temperature passive regeneration mode, the current carbon load of the integrated oxidation trap is lower than a third preset carbon load, thus ending the low-temperature passive regeneration mode; wherein, the third preset carbon load is less than the first preset carbon load; or In the low-temperature passive regeneration mode, the passive regeneration time is greater than or equal to a preset time, and the low-temperature passive regeneration mode ends.
4. The method for improving regeneration efficiency according to claim 1, characterized in that, Entering the high-temperature active regeneration mode includes: The upstream temperature of the first selective catalytic reduction system is controlled to reach a first preset temperature; wherein, the first preset temperature includes the ignition temperature of hydrocarbons; The downstream temperature of the integrated oxidation trap is controlled to reach a second preset temperature; The corrected oil quantity is calculated based on the difference between the real-time downstream temperature of the integrated oxidation trap and the second preset temperature.
5. The method for improving regeneration efficiency according to claim 4, characterized in that, Entering the high-temperature active regeneration mode also includes: The thermal melt of the exhaust gas is determined based on the upstream temperature of the first selective catalytic reduction system; Based on the upstream temperature and exhaust gas mass flow rate of the first selective catalytic reduction system, the hydrocarbon conversion efficiency of the integrated oxidation trap is determined. Based on the upstream temperature of the first selective catalytic reduction system, the exhaust gas mass flow rate, the thermal melting of the exhaust gas, and the preset regeneration temperature, the target heat requirement is calculated. The mass flow rate of hydrocarbons is calculated based on the target heat requirement, calorific value, and hydrocarbon conversion efficiency of the integrated oxidation trap.
6. The method for improving regeneration efficiency according to claim 5, characterized in that, Entering the high-temperature active regeneration mode also includes: Based on the mass flow rate of the hydrocarbon and the corrected fuel quantity, the regeneration fuel injection quantity for the high-temperature active regeneration mode is determined.
7. The method for improving regeneration efficiency according to claim 1, characterized in that, When the current carbon loading is greater than the second preset carbon loading, after entering the high-temperature active regeneration mode, the method for improving regeneration efficiency also includes: The target temperature percentage time, the timing time of the temperature control phase, and the pressure difference carbon loading reduction rate are obtained during the high-temperature active regeneration mode process; wherein, the pressure difference carbon loading reduction rate is obtained by dividing the difference in pressure difference carbon loading at the start and end of the high-temperature active regeneration mode by the duration of the high-temperature active regeneration mode. When the target temperature percentage time is greater than or equal to the first preset limit, the timing time of the temperature control stage is greater than or equal to the second preset limit, and the pressure difference carbon load reduction rate is greater than or equal to the preset threshold, a regeneration success prompt is issued.
8. The method for improving regeneration efficiency according to claim 7, characterized in that, Methods to improve regeneration efficiency also include: When the duration of the high-temperature active regeneration mode is greater than or equal to the preset duration, and the reduction rate of carbon load due to pressure difference is less than the preset threshold, a regeneration failure prompt is issued. Based on the regeneration failure message, a parking regeneration request message is sent.
9. A device for improving regeneration efficiency, characterized in that, It is applied to exhaust gas treatment devices, which include an integrated oxidation trap, a first selective catalytic reduction system and a second selective catalytic reduction system. The first selective catalytic reduction system is installed upstream of the integrated oxidation trap, and the second selective catalytic reduction system is installed downstream of the integrated oxidation trap. Devices that improve regeneration efficiency include: The low-temperature passive regeneration module enters the low-temperature passive regeneration mode when the real-time carbon load of the integrated oxidation trap is greater than the first preset carbon load, the average increase in carbon load is greater than the preset average, and the actual conversion efficiency of the first selective catalytic reduction system and the actual conversion efficiency of the second selective catalytic reduction system meet the low-temperature passive regeneration requirements. The acquisition module acquires the current carbon load of the integrated oxidation trap when the low-temperature passive regeneration mode ends. The high-temperature active regeneration module enters the high-temperature active regeneration mode when the current carbon load is greater than the second preset carbon load; wherein the second preset carbon load is greater than the first preset carbon load.
10. A vehicle, characterized in that, include: Exhaust gas treatment device; The exhaust gas treatment device includes an integrated oxidation trap, a first selective catalytic reduction system, and a second selective catalytic reduction system. The first selective catalytic reduction system is installed upstream of the integrated oxidation trap, and the second selective catalytic reduction system is installed downstream of the integrated oxidation trap. The apparatus for improving regeneration efficiency as described in claim 9 is communicatively connected to the exhaust gas treatment device.