Correction control method and device for exhaust gas recirculation valve

Abstract

The invention discloses a correction control method and device for an exhaust gas recirculation valve, and relates to the technical field of engine control. The scheme comprises the steps of obtaining a knock signal of an engine; an exhaust gas recirculation flow value of an exhaust gas recirculation flow characteristic table is reduced and adjusted based on the knock signal, and the exhaust gas recirculation flow value in the exhaust gas recirculation flow characteristic table is associated with the opening degree of an exhaust gas recirculation valve and the pressure ratio of the exhaust gas recirculation valve; according to the reduced exhaust gas circulation flow characteristic table, the corresponding target exhaust gas recirculation valve opening degree is determined, and the target exhaust gas recirculation valve opening degree is larger than the current valve opening degree of the exhaust gas recirculation valve; and an exhaust gas recirculation valve is controlled based on the target exhaust gas recirculation valve opening degree, so that the valve opening degree of the exhaust gas recirculation valve is adjusted to the target exhaust gas recirculation valve opening degree. According to the method, the engine performance under the current engine working condition can be kept under the condition that the actual EGR flow characteristic is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of engine control, and more specifically, to a correction control method and device for an exhaust gas recirculation valve. Background Art

[0002] With the release of the 2016 light vehicle pollutant emission limits and measurement methods (China Phase VI), vehicle emission and fuel consumption standards have been further tightened. In order to further reduce nitrogen oxide emissions and fuel consumption, the exhaust gas recirculation system (EGR system) is widely used in engine control systems. The EGR system is a technology used to reduce nitrogen oxides (NOx) in internal combustion engine emissions. It reintroduces part of the exhaust gas discharged by the engine into the intake system, mixes it with fresh air, and then re-enters the combustion chamber for combustion, which can reduce the combustion temperature and oxygen concentration, thereby reducing the generation of NOx.

[0003] However, engines with EGR systems often have problems with reduced actual EGR flow characteristics due to durable carbon deposits on the pipes / valve bodies or other factors during use, and the actual EGR rate also becomes lower. However, the model EGR rate calculated by the system does not decrease, resulting in the system compensating ignition angle being too large, which can easily lead to engine knock, reduced power output, reduced fuel efficiency, increased nitrogen oxide emissions and other engine performance issues.

[0004] Chinese patent application No. 202311520006.7, filed on November 14, 2023, discloses an EGR flow control method, device and equipment, which, after determining the difference between the actual EGR flow and the required EGR flow, judges the authenticity of the current flow difference by the knock intensity. If the actual EGR flow is determined to be inaccurate, the required EGR rate is corrected by the EGR rate correction factor corresponding to the current knock intensity. Although the patent reduces and corrects the required EGR rate after a knock signal occurs to match the actual EGR flow and achieve precise control of the EGR system, reducing the required EGR rate corresponding to the current engine operating conditions (such as engine speed and torque, etc.) may affect the engine performance under the current engine operating conditions, such as reduced power output, increased fuel consumption, and increased nitrogen oxide emissions. Summary of the invention

[0005] In view of this, the present invention provides a correction control method and device for an exhaust gas recirculation valve, which can maintain the engine performance under the current engine operating condition when the actual EGR flow characteristic is reduced.

[0006] In order to achieve the above object, the present invention adopts the following technical scheme:

[0007] In a first aspect, the present invention provides a correction control method for an exhaust gas recirculation valve, the method comprising:

[0008] Obtaining the knock signal of the engine;

[0009] Based on the knock signal, the exhaust gas recirculation flow value in the exhaust gas recirculation flow characteristic table is reduced and adjusted, wherein the exhaust gas recirculation flow value in the exhaust gas recirculation flow characteristic table is respectively correlated with the exhaust gas recirculation valve opening and the exhaust gas recirculation valve pressure ratio;

[0010] Determining a corresponding target exhaust gas recirculation valve opening according to the reduced exhaust gas circulation flow characteristic table, wherein the target exhaust gas recirculation valve opening is greater than a current valve opening of the exhaust gas recirculation valve;

[0011] The exhaust gas recirculation valve is controlled based on the target exhaust gas recirculation valve opening so that the valve opening of the exhaust gas recirculation valve is adjusted to the target exhaust gas recirculation valve opening.

[0012] The method provided by the present invention achieves the required EGR rate by reducing and correcting the test bench EGR flow and increasing the actual opening of the EGR valve after knock occurs. It can maintain the engine performance under the current engine operating conditions when the actual EGR flow characteristics are reduced, and can suppress the occurrence of knock to a certain extent.

[0013] In a possible implementation, adjusting the exhaust gas recirculation flow value of the exhaust gas recirculation flow characteristic table to decrease based on the knock signal includes:

[0014] The exhaust gas recirculation flow value is adjusted downward according to the preset step size.

[0015] In a possible implementation, the method further includes:

[0016] After the knock signal is acquired, a delay is started. If the knock signal is continuously acquired within the preset delay time, a step of adjusting the exhaust gas recirculation flow value of the exhaust gas recirculation flow characteristic table based on the knock signal is performed.

[0017] In a possible implementation, the method further includes:

[0018] After controlling the exhaust gas recirculation valve based on the target exhaust gas recirculation valve opening, the steps of obtaining the engine knock signal, reducing the exhaust gas recirculation flow value in the exhaust gas recirculation flow characteristic table based on the knock signal, and determining the corresponding target exhaust gas recirculation valve opening according to the reduced exhaust gas circulation flow characteristic table are repeated until the engine is turned off or the exhaust gas recirculation system is shut down.

[0019] In a possible implementation, adjusting the exhaust gas recirculation flow value of the exhaust gas recirculation flow characteristic table to decrease based on the knock signal includes:

[0020] Obtaining a current valve opening and a current valve pressure ratio of an exhaust gas recirculation valve;

[0021] The exhaust gas recirculation flow value corresponding to the current valve opening and the current valve pressure ratio in the exhaust gas recirculation flow characteristic table is adjusted to decrease.

[0022] In a second aspect, the present invention provides a correction control device for an exhaust gas recirculation valve, the device comprising: a knock signal acquisition module, a flow value adjustment module, an opening determination module and an opening control module;

[0023] A knock signal acquisition module, connected to the flow value adjustment module, for acquiring a knock signal of the engine;

[0024] a flow value adjustment module, connected to the knock signal acquisition module and the opening determination module respectively, for reducing and adjusting the exhaust gas recirculation flow value of the exhaust gas recirculation flow characteristic table based on the knock signal, wherein the exhaust gas recirculation flow value in the exhaust gas recirculation flow characteristic table is respectively correlated with the exhaust gas recirculation valve opening and the exhaust gas recirculation valve pressure ratio;

[0025] an opening determination module, connected to the flow value adjustment module and the opening control module respectively, for determining a corresponding target exhaust gas recirculation valve opening according to the reduced exhaust gas circulation flow characteristic table, wherein the target exhaust gas recirculation valve opening is greater than a current valve opening of the exhaust gas recirculation valve;

[0026] The opening control module is connected to the opening determination module and is used to control the exhaust gas recirculation valve based on the target exhaust gas recirculation valve opening so that the valve opening of the exhaust gas recirculation valve is adjusted to the target exhaust gas recirculation valve opening.

[0027] In a third aspect, the present invention provides an engine controller comprising a processor and a memory; the memory stores a computer program or computer instructions that can be loaded by the processor and executed by a corrected control method for an exhaust gas recirculation valve such as the first aspect and any possible implementation thereof.

[0028] In a fourth aspect, the present invention provides a vehicle comprising the engine controller of the third aspect.

[0029] In a fifth aspect, the present invention provides a computer-readable storage medium storing a computer program or computer instructions that can be loaded by a processor and executed by a correction control method for an exhaust gas recirculation valve such as the first aspect and any possible implementation thereof.

[0030] In a sixth aspect, the present invention provides a computer program product, comprising a computer program or computer instructions, which, when loaded and executed by a processor, implement the steps of a method for correcting control of an exhaust gas recirculation valve as in the first aspect and any possible implementation thereof.

[0031] For the specific description of the second to sixth aspects of the present invention and their various implementations, reference can be made to the detailed description of the first aspect and its various implementations; and for the beneficial effects of the second to sixth aspects and their various implementations, reference can be made to the analysis of the beneficial effects of the first aspect and its various implementations, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0033] Figure 1 It is a model principle diagram of a model EGR rate guiding model EGR opening and ignition angle output in an exhaust gas recirculation system according to an embodiment of the present invention;

[0034] Figure 2 is a flow chart of a correction control method for an exhaust gas recirculation valve according to an embodiment of the present invention;

[0035] Figure 3 is a flow chart of an exhaust gas recirculation flow value adjustment method according to an embodiment of the present invention;

[0036] Figure 4 It is a flowchart of a specific application of a correction control method for an exhaust gas recirculation valve according to an embodiment of the present invention;

[0037] Figure 5 It is a block diagram of the internal structure of a correction control device for an exhaust gas recirculation valve according to an embodiment of the present invention;

[0038] Figure 6 It is a block diagram of the internal structure of an engine controller according to an embodiment of the present invention. DETAILED DESCRIPTION

[0039] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0040] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0041] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0042] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0043] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0044] In the following, the terms "first", "second", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features.

[0045] In order to facilitate understanding of the technical solution of the present invention, the terms involved in the present invention are briefly introduced below.

[0046] 1. EGR valve: The full name is Exhaust Gas Recirculation Valve, which is a key component in the engine's exhaust gas recirculation system (EGR system). It uses the exhaust gas discharged by the engine to guide part of the exhaust gas back to the intake manifold by controlling the opening of the valve, and then mixes with fresh air and re-enters the combustion chamber, which can reduce the temperature and pressure of the combustion chamber, reduce the emission of nitrogen oxides (NOx), and improve fuel economy and combustion efficiency in some cases.

[0047] 2. EGR valve opening: refers to the opening of the EGR valve, which is a key parameter for controlling the amount of exhaust gas recirculation. Its opening size directly affects the engine performance and exhaust emissions.

[0048] 3. EGR valve pressure ratio: It refers to the ratio of the pressure after the EGR valve (i.e. after the exhaust gas enters the intake manifold) to the pressure before the EGR valve (i.e. the pressure in the exhaust manifold).

[0049] 4. EGR flow: also known as exhaust gas recirculation flow, which is the exhaust gas flow recirculated in the EGR system.

[0050] 5. EGR rate: It is the ratio of the amount of recirculated exhaust gas to the total amount of intake air sucked into the cylinder.

[0051] 6. Exhaust Gas Recirculation Flow Characteristics Table: refers to a data table established in the engine bench test to accurately control and optimize the flow of the EGR (Exhaust Gas Recirculation) system. This table will list in detail the EGR flow values ​​required under different EGR operating conditions (such as valve pressure ratio, valve opening, etc.). These EGR flow values ​​are obtained through actual engine testing and calibration.

[0052] 7. EGR flow characteristics: refers to the EGR flow corresponding to different EGR valve pressure ratios and EGR valve openings in the exhaust gas recirculation flow characteristics table.

[0053] 8. Engine controller: refers to the Engine Control Unit (ECU), which is a key electronic component used to manage and optimize engine performance in modern cars. It monitors and adjusts the engine's operating parameters in real time to ensure that the engine can operate efficiently and environmentally friendly under different operating conditions.

[0054] 9. Basic ignition angle: refers to the initial ignition advance angle set by the engine control unit (ECU) under specific working conditions. This angle is pre-set at a certain engine speed and load in order to achieve the best combustion efficiency and performance. The basic ignition angle is the ignition timing before any correction is made to the ignition system. It is usually determined by the engine manufacturer based on the design and performance requirements of the engine.

[0055] 10. Compensated ignition angle: refers to the adjustment of the engine ignition timing during engine operation in order to optimize combustion efficiency, reduce emissions, prevent detonation and other phenomena.

[0056] 11. Engine knock: Also known as knocking or cylinder knocking, it is a sudden, non-long-lasting vibration phenomenon in the engine combustion chamber caused by abnormal ignition. It will lead to reduced engine performance, increased fuel consumption, and may cause damage to the engine.

[0057] Figure 1 A model principle diagram of a model EGR rate guiding the model EGR opening and ignition angle output in an exhaust gas recirculation system is shown.

[0058] like Figure 1 As shown, the model EGR rate is calculated from the engine operating data (engine speed and engine torque). The calculated model EGR rate and the engine speed together determine the EGR compensation ignition angle, and then together with the basic ignition angle determine the output ignition angle. In addition, the model EGR flow rate can be calculated based on the calculated model EGR rate, and then the model EGR valve opening can be calculated.

[0059] Figure 1 The model parameters in the calculation model shown are all expected parameters in the exhaust gas recirculation system, that is, ideal EGR-related parameters under the current engine operating conditions (engine speed and engine torque). These EGR-related parameters combined with the current engine operating conditions can maintain the engine performance in a relatively good state.

[0060] Generally, these expected EGR parameters are provided by an EGR exhaust gas recirculation flow characteristic table, which records the corresponding relationship between the exhaust gas recirculation valve opening and the exhaust gas recirculation valve pressure ratio and the exhaust gas recirculation flow value, see Table 1.

[0061] Table 1 EGR exhaust gas recirculation flow characteristics

[0062]

[0063] It should be noted that the above Table 1 only exemplarily reflects the corresponding relationship between the exhaust gas recirculation valve opening, the exhaust gas recirculation valve pressure ratio and the exhaust gas recirculation flow value. The values ​​of the valve opening and the valve pressure ratio are not comprehensive, and the values ​​of the EGR valve opening, the EGR valve pressure ratio and the EGR flow may vary depending on the selected EGR valve.

[0064] It is understandable that through Figure 1 The model EGR flow calculated by the calculation model shown is the expected EGR flow under the current engine operating condition, and the expected EGR flow is also the original EGR flow under the current EGR operating condition in the above exhaust gas recirculation flow characteristic table.

[0065] When an engine with an EGR system is in use, the actual EGR flow characteristics decrease due to long-term carbon deposits in the pipes / valve bodies or other factors, and the actual EGR rate also decreases. Figure 1 The model EGR rate calculated by the calculation model shown does not decrease accordingly, but remains unchanged. This causes the system to compensate for the ignition angle too much, which can easily lead to engine knock, reduced power output, reduced fuel efficiency, increased nitrogen oxide emissions and other engine performance problems.

[0066] Embodiment 1:

[0067] The embodiment of the present invention provides a correction control method for an exhaust gas recirculation valve. Figure 2 , which is a flow chart of a correction control method for an exhaust gas recirculation valve provided by an embodiment of the present invention. Figure 2 As shown, the correction control method of the exhaust gas recirculation valve provided by the present invention mainly includes the following steps (steps S201 to S204):

[0068] Step S201, obtaining a knock signal of the engine;

[0069] Step S202, reducing and adjusting the exhaust gas recirculation flow value in the exhaust gas recirculation flow characteristic table based on the knock signal, wherein the exhaust gas recirculation flow value in the exhaust gas recirculation flow characteristic table is respectively correlated with the exhaust gas recirculation valve opening and the exhaust gas recirculation valve pressure ratio;

[0070] Step S203, determining a corresponding target exhaust gas recirculation valve opening according to the reduced exhaust gas circulation flow characteristic table, wherein the target exhaust gas recirculation valve opening is greater than the current valve opening of the exhaust gas recirculation valve;

[0071] Step S204 : controlling the exhaust gas recirculation valve based on the target exhaust gas recirculation valve opening, so that the valve opening of the exhaust gas recirculation valve is adjusted to the target exhaust gas recirculation valve opening.

[0072] In order to be able to correct the EGR system in real time, after step S204 is executed, steps S201 to S204 are repeatedly executed until the engine is turned off or the exhaust gas recirculation system is shut down.

[0073] In some optional embodiments, the exhaust gas recirculation flow value may be reduced and adjusted according to a preset step length. The preset step length is a preset correction flow value, and the engine controller subtracts the preset correction flow value from the exhaust gas recirculation flow value to obtain the reduced exhaust gas recirculation flow value.

[0074] In this embodiment, the engine controller calculates the data collected by the knock sensor to obtain the knock intensity. If the knock intensity exceeds a preset threshold, it means that a knock signal is generated and the engine knocks.

[0075] Furthermore, in order to filter out occasional knock conditions and improve the accuracy of knock detection, a delay may be started after the knock signal is obtained. If the knock signal is continuously obtained within the preset delay period, it indicates that knock has indeed occurred, and step S202 is then executed.

[0076] The occurrence of knock indicates that the actual EGR flow at this time is smaller than the expected EGR flow, and the model EGR rate, that is, the expected EGR rate, is greater than the actual EGR rate. Therefore, the exhaust gas recirculation flow value in the exhaust gas recirculation flow characteristic table is reduced and adjusted so that the reduced exhaust gas recirculation flow value can match the current actual EGR flow; then the opening of the EGR valve is increased according to the reduced exhaust gas recirculation flow value, so that the actual EGR flow increases, so that it can develop towards a trend close to the expected EGR flow, and then the actual EGR rate will also increase, so that it can develop towards a trend close to the expected EGR rate. In this way, the compensated ignition angle determined according to the expected EGR rate and the actual EGR valve opening can develop towards a matching trend, which can suppress the generation of knock signals to a certain extent and maintain the performance of the engine.

[0077] Embodiment 2:

[0078] With respect to step S202 in embodiment one, the embodiment of the present invention obtains first current operating condition information of the exhaust gas recirculation valve, which includes the current valve opening and the current valve pressure ratio of the exhaust gas recirculation valve, searches for the exhaust gas recirculation flow value corresponding to the current valve opening and the current valve pressure ratio in the exhaust gas recirculation flow characteristic table, and reduces and adjusts the found exhaust gas recirculation flow value.

[0079] Please refer to Figure 3 , which is a flow chart of the exhaust gas recirculation flow value adjustment method provided by an embodiment of the present invention. Figure 3 As shown, the method mainly includes the following steps (steps S301 to S303):

[0080] Step S301, querying the exhaust gas recirculation flow characteristic table to see whether there is an exhaust gas recirculation valve opening equal to the current valve opening;

[0081] Step S302, if it exists, then the exhaust gas recirculation flow value corresponding to the queried exhaust gas recirculation valve opening and the current valve pressure ratio is reduced and adjusted;

[0082] Step S303: if it does not exist, then the exhaust gas recirculation flow value corresponding to the first valve opening, the second valve opening and the current valve pressure ratio is adjusted to be reduced.

[0083] In this embodiment, the first valve opening is the minimum opening of all exhaust gas recirculation valve openings in the exhaust gas recirculation flow characteristic table that are greater than the current valve opening; the second valve opening is the maximum opening of all exhaust gas recirculation valve openings in the exhaust gas recirculation flow characteristic table that are less than the current valve opening.

[0084] Further, for step S203, determining the target exhaust gas recirculation valve opening can be divided into the following two cases:

[0085] (1) for the exhaust gas recirculation flow value queried in step S302, the engine controller determines a target exhaust gas recirculation valve opening based on the expected exhaust gas recirculation flow value, the reduced exhaust gas recirculation flow value, the current valve opening, the first valve opening, and the first exhaust gas recirculation flow value;

[0086] (2) For the EGR flow value queried in step S303, the engine controller determines the target EGR valve opening based on the expected EGR flow value, the reduced EGR flow value, the first valve opening, and the second valve opening.

[0087] In this embodiment, the first exhaust gas recirculation flow value is an exhaust gas recirculation flow value corresponding to the first valve opening and the current valve pressure ratio in the exhaust gas recirculation flow characteristic table.

[0088] The following is an example of step S204 and step S206 in conjunction with Table 1.

[0089] After the EGR system is started and the knock judgment conditions are met for the first time, the current valve opening is 10% and the current valve pressure ratio is 40. By querying Table 1, it is determined that the exhaust gas recirculation flow rate of the test bench to be corrected is 7.6kg / h. The flow rate is reduced by 0.2kg / h to 7.4kg / h, that is, the EGR flow rate corresponding to the current valve opening of 10% and the current valve pressure ratio of 40 in Table 1 becomes 7.4kg / h.

[0090] In Table 1, the next valve opening of the current valve opening of 10% is 12%, and the EGR flow rate corresponding to the valve opening of 12% and the valve pressure ratio of 40 is 9.9. Since it is the first time that knock occurs, the expected exhaust gas recirculation valve opening is the current valve opening, the expected exhaust gas recirculation valve pressure ratio is the current valve pressure ratio, and the expected exhaust gas recirculation flow rate value is the exhaust gas recirculation flow rate to be corrected corresponding to the current valve opening and the current valve pressure ratio, that is, 7.6kg / h.

[0091] At this time, it is necessary to calculate the expected valve opening corresponding to the expected exhaust gas recirculation flow value of 7.6kg / h, that is, the target exhaust gas recirculation valve opening. The target exhaust gas recirculation valve opening x1 is calculated by linear interpolation, and the calculation formula is (x1-10%) / (12%-10%)=(7.6-7.4) / (9.9-7.4), and x1=10.16%. Then adjust the opening of the EGR valve to 10.16%, and complete one cycle.

[0092] When the knock signal is detected again, the current valve pressure ratio remains unchanged at 40, and the current valve opening becomes 10.16%, but there is no valve opening of 10.16% in Table 1. At this time, the two valve openings 10% and 12% closest to 10.16% in Table 1 are selected, and the EGR flow rate of 7.4kg / h corresponding to the valve opening of 10% and the valve pressure ratio of 40 is reduced by 0.2kg / h to 7.2kg / h, and the EGR flow rate of 9.9kg / h corresponding to the valve opening of 12% and the valve pressure ratio of 40 is reduced by 0.2kg / h to 9.7kg / h.

[0093] Since we want to maintain the engine performance, the expected exhaust gas recirculation flow rate value remains unchanged, still 7.6 kg / h. The target exhaust gas recirculation valve opening x2 is still calculated based on linear interpolation, and the calculation formula is (x2-10%) / (12%-10%)=(7.6-7.2) / (9.7-7.2), and x2=10.32%. Then the opening of the EGR valve is adjusted to 10.32%, completing the first cycle, and so on.

[0094] Embodiment three:

[0095] In practical applications, the above embodiments and preferred embodiments may be integrated according to the actual application requirements. In order to facilitate technical personnel in this field to understand how to implement the actual application and how to combine the preferred embodiments, the correction control method of the above exhaust gas recirculation valve is described in detail below, taking a preset delay time of 200ms and a preset step size of 0.2kg / h as an example.

[0096] For the specific implementation process, please refer to Figure 4 , Figure 4 FIG. 1 is a schematic diagram of a specific application of a correction control method for an exhaust gas recirculation valve in an embodiment of the present invention. Figure 4 As shown, the method includes the following steps (steps S401 to S404):

[0097] Step S401, obtaining the knock signal of the engine within 200 ms;

[0098] Step S402, based on the knock signal, reducing the exhaust gas recirculation flow value in the exhaust gas recirculation flow characteristic table by 0.2 kg / h, wherein the exhaust gas recirculation flow value in the exhaust gas recirculation flow characteristic table is respectively correlated with the exhaust gas recirculation valve opening and the exhaust gas recirculation valve pressure ratio;

[0099] Step S403, determining a corresponding target exhaust gas recirculation valve opening according to the reduced exhaust gas circulation flow characteristic table, wherein the target exhaust gas recirculation valve opening is greater than the current valve opening of the exhaust gas recirculation valve;

[0100] Step S404: controlling the exhaust gas recirculation valve based on the target exhaust gas recirculation valve opening, so that the valve opening of the exhaust gas recirculation valve is adjusted to the target exhaust gas recirculation valve opening.

[0101] Embodiment 4:

[0102] Based on the same inventive concept, an embodiment of the present invention further provides a correction control device for an exhaust gas recirculation valve for implementing the correction control method for an exhaust gas recirculation valve involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific definition in the embodiments of one or more correction control devices for exhaust gas recirculation valves provided below can refer to the definition of the correction control method for exhaust gas recirculation valves above, and will not be repeated here.

[0103] Figure 5 FIG. 5 shows a structural block diagram of a correction control device 500 for an exhaust gas recirculation valve. Figure 5 As shown, the correction control device 500 of the exhaust gas recirculation valve includes: a knock signal acquisition module 501, a flow value adjustment module 502, an opening determination module 503 and an opening control module 504;

[0104] A knock signal acquisition module 501, connected to the flow value adjustment module 502, is used to acquire a knock signal of the engine;

[0105] a flow value adjustment module 502, connected to the knock signal acquisition module 501 and the opening determination module 503, respectively, for reducing and adjusting the exhaust gas recirculation flow value in the exhaust gas recirculation flow characteristic table based on the knock signal, wherein the exhaust gas recirculation flow value in the exhaust gas recirculation flow characteristic table is respectively associated with the exhaust gas recirculation valve opening and the exhaust gas recirculation valve pressure ratio;

[0106] an opening determination module 503, connected to the flow value adjustment module 502 and the opening control module 504, respectively, for determining a corresponding target exhaust gas recirculation valve opening according to the reduced exhaust gas circulation flow characteristic table, wherein the target exhaust gas recirculation valve opening is greater than the current valve opening of the exhaust gas recirculation valve;

[0107] The opening control module 504 is connected to the opening determination module 503 and is used to control the exhaust gas recirculation valve based on the target exhaust gas recirculation valve opening so that the valve opening of the exhaust gas recirculation valve is adjusted to the target exhaust gas recirculation valve opening.

[0108] In some optional embodiments, the flow value adjustment module 502 is specifically configured to reduce the exhaust gas recirculation flow value according to a preset step size.

[0109] In some optional embodiments, the correction control device 500 of the exhaust gas recirculation valve also includes: a delay module, which is respectively connected to the knock signal acquisition module 501 and the flow value adjustment module 502, and is used to start the delay after the knock signal is acquired. If the knock signal is continuously acquired within the preset delay period, the step of adjusting the exhaust gas recirculation flow value in the exhaust gas recirculation flow characteristic table based on the knock signal is executed.

[0110] In some optional embodiments, the flow value adjustment module 502 is further specifically used to obtain the current valve opening and the current valve pressure ratio of the exhaust gas recirculation valve; and to reduce and adjust the exhaust gas recirculation flow value corresponding to the current valve opening and the current valve pressure ratio in the exhaust gas recirculation flow characteristic table.

[0111] It should be noted that the above-mentioned functional modules can be integrated together to form an independent unit, for example, integrated into a processing unit, or each module can exist physically separately, or two or more modules can be integrated to form an independent unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of a software functional unit. If the function is implemented in the form of a software functional module and sold or used as an independent product, it can be stored in a computer-readable storage medium.

[0112] Embodiment five:

[0113] Based on the same inventive concept, the embodiment of the present invention further provides an engine controller 600, the internal structure of the engine controller 600 is as follows: Figure 6 The engine controller 600 includes a memory 601 , a processor 602 and a communication bus 603 ; the memory 601 and the processor 602 are connected via the communication bus 603 .

[0114] The memory 601 can be used to store instructions, programs, codes, code sets or instruction sets. The memory 601 can include a program storage area and a data storage area, wherein the program storage area can store instructions for implementing an operating system, instructions for at least one function, and instructions for implementing the correction control method for an exhaust gas recirculation valve provided in the above embodiment, etc.; the data storage area can store data involved in the correction control method for an exhaust gas recirculation valve provided in the above embodiment, etc.

[0115] The processor 602 may include one or more processing cores. The processor 602 executes various functions and processes data of the present invention by running or executing instructions, programs, code sets or instruction sets stored in the memory 601, calling the data stored in the memory 601. The processor 602 may be at least one of an application-specific integrated circuit (ASIC), a digital signal processor (DSP), a digital signal processing device (DSPD), a programmable logic device (PLD), a field programmable gate array (FPGA), a central processing unit (CPU), a controller, a microcontroller and a microprocessor. It is understandable that for different devices, the electronic device used to implement the above-mentioned processor function may also be other, and the embodiment of the present invention is not specifically limited.

[0116] The communication bus 603 may include a path to transmit information between the above components. The communication bus 603 may be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus. The communication bus 603 may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 6Only one double arrow is used in the diagram, but it does not mean that there is only one bus or one type of bus. Figure 6 The engine controller shown is only an example and should not bring any limitation to the functions and application scope of the embodiments of the present invention.

[0117] Those skilled in the art will understand that Figure 6 The structure shown in the figure is only a block diagram of a part of the structure related to the scheme of the present invention, and does not constitute a limitation on the engine controller to which the scheme of the present invention is applied. The specific engine controller may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0118] Embodiment six:

[0119] Based on the fifth embodiment, the present invention also provides a vehicle including the engine controller described in the fifth embodiment.

[0120] Embodiment seven:

[0121] In particular, according to an embodiment of the present invention, the process described in the above flowchart may be implemented as a computer software program.

[0122] The technical solution of the present invention, in essence, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, that is, the embodiment of the present invention also provides a computer-readable storage medium, which includes a number of computer programs or computer instructions, which are used to enable an electronic device (which can be a personal computer, server or network device, etc.) or a processor to perform all or part of the steps of the methods of various embodiments of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory, random access memory, disk or optical disk, etc., various media that can store program codes.

[0123] Embodiment eight:

[0124] Embodiments of the present invention also include a computer program product, which includes a computer program carried on a computer readable medium, the computer program including a computer program for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network, and / or installed from a removable medium. When the computer program is executed by a central processing unit (CPU), various functions defined in the present invention are executed.

[0125] Although some specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A correction control method for an exhaust gas recirculation valve, characterized in that: include: Obtaining the knock signal of the engine; Based on the knock signal, the exhaust gas recirculation flow value in the exhaust gas recirculation flow characteristic table is adjusted to decrease, wherein the exhaust gas recirculation flow value in the exhaust gas recirculation flow characteristic table is respectively correlated with the exhaust gas recirculation valve opening and the exhaust gas recirculation valve pressure ratio; Determining a corresponding target exhaust gas recirculation valve opening according to the reduced exhaust gas circulation flow characteristic table, wherein the target exhaust gas recirculation valve opening is greater than a current valve opening of the exhaust gas recirculation valve; The exhaust gas recirculation valve is controlled based on the target exhaust gas recirculation valve opening so that the valve opening of the exhaust gas recirculation valve is adjusted to the target exhaust gas recirculation valve opening.

2. The correction control method of the exhaust gas recirculation valve according to claim 1, characterized in that: The reducing and adjusting the exhaust gas recirculation flow value of the exhaust gas recirculation flow characteristic table based on the knock signal includes: The exhaust gas recirculation flow rate value is adjusted to decrease according to a preset step size.

3. The correction control method of the exhaust gas recirculation valve according to claim 1, characterized in that: Also includes: A delay is started after the knock signal is acquired. If the knock signal is continuously acquired within a preset delay time, the step of adjusting the exhaust gas recirculation flow value of the exhaust gas recirculation flow characteristic table based on the knock signal is performed.

4. The correction control method of the exhaust gas recirculation valve according to any one of claims 1 to 3, characterized in that: Also includes: After controlling the exhaust gas recirculation valve based on the target exhaust gas recirculation valve opening, the steps of obtaining the engine knock signal, reducing the exhaust gas recirculation flow value in the exhaust gas recirculation flow characteristic table based on the knock signal, and determining the corresponding target exhaust gas recirculation valve opening according to the reduced exhaust gas circulation flow characteristic table are repeatedly performed until the engine is turned off or the exhaust gas recirculation system is shut down.

5. The correction control method of the exhaust gas recirculation valve according to claim 1 or 2, characterized in that: The reducing and adjusting the exhaust gas recirculation flow value of the exhaust gas recirculation flow characteristic table based on the knock signal includes: Acquiring a current valve opening and a current valve pressure ratio of the exhaust gas recirculation valve; The exhaust gas recirculation flow value corresponding to the current valve opening and the current valve pressure ratio in the exhaust gas recirculation flow characteristic table is adjusted to decrease.

6. A correction control device for an exhaust gas recirculation valve, characterized in that: include: A knock signal acquisition module, a flow value adjustment module, an opening determination module and an opening control module; The knock signal acquisition module is connected to the flow value adjustment module and is used to acquire the knock signal of the engine; The flow value adjustment module is connected to the knock signal acquisition module and the opening determination module respectively, and is used to reduce and adjust the exhaust gas recirculation flow value of the exhaust gas recirculation flow characteristic table based on the knock signal, wherein the exhaust gas recirculation flow value in the exhaust gas recirculation flow characteristic table is respectively correlated with the exhaust gas recirculation valve opening and the exhaust gas recirculation valve pressure ratio; The opening determination module is connected to the flow value adjustment module and the opening control module respectively, and is used to determine the corresponding target exhaust gas recirculation valve opening according to the reduced exhaust gas circulation flow characteristic table, wherein the target exhaust gas recirculation valve opening is greater than the current valve opening of the exhaust gas recirculation valve; The opening control module is connected to the opening determination module, and is used to control the exhaust gas recirculation valve based on the target exhaust gas recirculation valve opening, so that the valve opening of the exhaust gas recirculation valve is adjusted to the target exhaust gas recirculation valve opening.

7. An engine controller, characterized in that: including a processor and a memory; The memory stores a computer program or a computer instruction that can be loaded by the processor and executes the correction control method of the exhaust gas recirculation valve according to any one of claims 1 to 5.

8. A vehicle, characterized in that: Comprising the engine controller as claimed in claim 7.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program or computer instructions that can be loaded by a processor and execute the correction control method for the exhaust gas recirculation valve according to any one of claims 1 to 5.

10. A computer program product comprising a computer program or computer instructions, characterized in that When the computer program or the computer instructions are loaded and executed by a processor, the steps of the correction control method of the exhaust gas recirculation valve as claimed in any one of claims 1 to 5 are implemented.

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