Method and device for determining engine oil dilution, storage medium and electronic device

Abstract

The application provides a method and device for determining oil dilution, a storage medium and an electronic device. The method comprises the following steps: determining that a diesel particulate filter enters an active regeneration process, the active regeneration process being a process of removing particles deposited in a filter of the diesel particulate filter by injecting diesel into a cylinder through post-injection; obtaining a first diesel injection amount and a second diesel injection amount, the first diesel injection amount being a total amount of diesel injected into the cylinder through post-injection, and the second diesel injection amount being an amount of diesel entering a diesel oxidation catalyst for reaction; determining a third diesel injection amount according to a difference between the first diesel injection amount and the second diesel injection amount, the third diesel injection amount being an amount of diesel injected onto an inner wall of the cylinder through post-injection. The method can accurately identify the oil dilution condition based on the calculation of the amount of diesel injected onto the inner wall of the cylinder through post-injection in the DPF active regeneration process chemical reaction.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of engine oil dilution determination, and in particular, to an engine oil dilution determination method, an engine oil dilution determination device, a computer readable storage medium and an electronic device. BACKGROUND

[0002] Particulate matter is one of the main pollutants in diesel exhaust emissions. At present, the most effective aftertreatment device for reducing diesel particulate emissions is a wall-flow diesel particulate filter (DPF). When the DPF traps particulate matter to a certain limit, measures need to be taken to clean the particulate matter, i.e., DPF active regeneration. DPF active regeneration requires injecting diesel fuel through in-cylinder late post-injection. The diesel fuel burns in the DOC and releases heat to raise the temperature in the DPF to above 500°C, which can remove the particulate matter in the DPF and restore the particulate trapping capacity of the DPF.

[0003] However, the existing diesel late post-injection method has poor atomization effect, and diesel fuel is often sprayed onto the inner wall of the cylinder. The diesel fuel on the inner wall condenses into larger liquid particles, and during the operation of the piston, the liquid particles pass through the oil ring oil return hole, enter the crankcase, and mix with the engine oil in the oil sump, diluting the engine oil in the oil sump and greatly shortening the service life of the engine oil. At this time, if the engine oil is not replaced, it will have an adverse effect on the camshaft, cylinder liner and other wear parts of the engine, and even cause engine cylinder pulling problems. Therefore, it is necessary to accurately determine the dilution degree of the engine oil in the oil sump to ensure the performance of the vehicle. However, in the existing scheme, only the number of DPF active regeneration is used to determine the dilution degree of the engine oil, and the accuracy of this determination method is low, which cannot accurately identify the dilution of the engine oil, and there is still a serious risk of wear of vehicle parts and cylinder pulling of the diesel engine. SUMMARY

[0004] The main purpose of the present application is to provide an engine oil dilution determination method, an engine oil dilution determination device, a computer readable storage medium and an electronic device to at least solve the problem that the prior art cannot accurately identify the dilution of the engine oil, resulting in wear of vehicle parts and a high risk of cylinder pulling of the diesel engine.

[0005] In order to achieve the above object, according to one aspect of the present application, a method for determining oil dilution is provided, comprising: determining that a diesel particulate filter enters an active regeneration process, the active regeneration process being a process of removing particles deposited in a filter of the diesel particulate filter by injecting diesel into a cylinder through a post-injection mode; obtaining a first diesel injection amount and a second diesel injection amount, the first diesel injection amount being a total amount of diesel injected into the cylinder through the post-injection mode, and the second diesel injection amount being an amount of diesel entering a diesel oxidation catalyst for reaction; obtaining a difference between the first diesel injection amount and the second diesel injection amount, determining the difference as a third diesel injection amount, and determining oil dilution according to a size of the third diesel injection amount, the third diesel injection amount being an amount of diesel injected onto an inner wall of the cylinder through the post-injection mode.

[0006] Optionally, obtaining the first diesel injection amount comprises: obtaining an actual diesel injection mass flow rate and a post-injection duration of the diesel particulate filter in the active regeneration process; and obtaining a first injection amount formula wherein q 实际 is the first diesel injection amount, m 实际 is the actual diesel injection mass flow rate, in g / s, and t1 is the post-injection duration, in s; and determining the first diesel injection amount according to the first injection amount formula.

[0007] Optionally, obtaining the second diesel injection amount comprises: obtaining a DOC heat dissipation amount, a diesel heat value, and a diesel conversion efficiency, the DOC heat dissipation amount being a heat dissipation amount of the diesel oxidation catalyst DOC to the environment, and the diesel conversion efficiency being a conversion efficiency of diesel in the diesel oxidation catalyst; determining a diesel heat release amount according to the DOC heat dissipation amount, the diesel heat release amount being a heat release amount of diesel in the diesel oxidation catalyst; and obtaining a second injection amount formula wherein q DOC is the second diesel injection amount, Q 放热 is the diesel heat release amount, R is the diesel heat value, and f is the diesel conversion efficiency; and determining the second diesel injection amount according to the second injection amount formula.

[0008] Optionally, determining the diesel heat release amount according to the DOC heat dissipation amount comprises: determining a target time, the target time being a duration during which an absolute value of a target temperature difference is less than a temperature limit value, the target temperature difference being a difference between a first temperature detected by an upstream temperature sensor of the diesel oxidation catalyst and a second temperature detected by a downstream temperature sensor of the diesel oxidation catalyst when the diesel particulate filter starts to inject through the post-injection mode to when regeneration is completed in the active regeneration process; and obtaining a heat release amount formula wherein Q放热 Qd is the heat release of the diesel, in J, C is the specific heat capacity of exhaust gas, in J / (kg·℃), t2 is the target time, in s, m 排气 is the exhaust mass flow, in kg / s, t dowm is the value collected by the temperature sensor downstream of the DOC, in ℃, t up is the value collected by the temperature sensor upstream of the DOC, in ℃, Q 散热 Qd is the heat release of the diesel, in J; the heat release of the diesel is determined according to the heat release formula and the heat release of the DOC.

[0009] Optionally, the heat release of the DOC is obtained, comprising: obtaining a heat release formula wherein, Q 散热 Qd is the heat release of the diesel, A is the area of the heat dissipation surface, t2 is the target time, in s, μ is the heat dissipation coefficient, in J / (m 2 ·℃), t DOC is the temperature of the DOC, in ℃, t Env is the ambient temperature, in ℃, wherein, the temperature of the DOC wherein, t dowm is the value collected by the temperature sensor downstream of the DOC, in ℃, t up is the value collected by the temperature sensor upstream of the DOC, in ℃; the heat release of the DOC is determined according to the heat release formula.

[0010] Optionally, determining that the diesel particulate filter enters an active regeneration process comprises: receiving an active regeneration request, the active regeneration request being request information indicating that the diesel particulate filter enters an active regeneration process; obtaining a performance parameter of an oil injector, the oil injector being an oil injector that injects diesel, the performance parameter of the oil injector including at least one of the following: a degree of wear of the oil injector, a degree of blockage of the oil injector; determining whether the oil injector is working normally according to the performance parameter of the oil injector; and in the case where the oil injector is working normally, determining that the diesel particulate filter enters an active regeneration process according to the active regeneration request.

[0011] Optionally, the dilution degree of the oil is determined according to the size of the third diesel injection amount, comprising: in the case where the third diesel injection amount is greater than a target threshold value, determining that the dilution degree of the oil is greater than a target dilution degree and sending a replacement oil reminder information; in the case where the third diesel injection amount is less than or equal to the target threshold value, determining that the dilution degree of the oil is less than or equal to the target dilution degree.

[0012] According to another aspect of the present application, there is provided a device for determining oil dilution, comprising: a determination unit configured to determine that a diesel particulate filter enters an active regeneration process, the active regeneration process being a process of removing particles deposited in a filter of the diesel particulate filter by injecting diesel into a cylinder through a post-injection method; a first acquisition unit configured to acquire a first diesel injection amount and a second diesel injection amount, the first diesel injection amount being a total amount of diesel injected into the cylinder through the post-injection method, the second diesel injection amount being an amount of diesel entering a diesel oxidation catalyst for reaction; and a second acquisition unit configured to acquire a difference between the first diesel injection amount and the second diesel injection amount, determine a third diesel injection amount based on the difference, and determine a dilution degree of oil based on the third diesel injection amount, the third diesel injection amount being an amount of diesel injected onto an inner wall of the cylinder through the post-injection method.

[0013] According to another aspect of the present application, there is provided a computer-readable storage medium comprising a stored program, wherein the program, when executed, controls a device in which the computer-readable storage medium is located to perform any of the methods for determining oil dilution.

[0014] According to another aspect of the present application, there is provided an electronic device comprising: one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, and the one or more programs comprise a program for performing any of the methods for determining oil dilution.

[0015] According to the technical solution of the present application, the method for determining oil dilution first determines that the diesel particulate filter enters an active regeneration process, the active regeneration process being a process of removing particles deposited in a filter of the diesel particulate filter by injecting diesel into a cylinder through a post-injection method; then acquires a first diesel injection amount and a second diesel injection amount, the first diesel injection amount being a total amount of diesel injected into the cylinder through the post-injection method, the second diesel injection amount being an amount of diesel entering a diesel oxidation catalyst for reaction; and finally acquires a difference between the first diesel injection amount and the second diesel injection amount, determines a third diesel injection amount based on the difference, and determines a dilution degree of oil based on the third diesel injection amount, the third diesel injection amount being an amount of diesel injected onto an inner wall of the cylinder through the post-injection method. This method can accurately identify the oil dilution condition based on the amount of diesel injected onto the inner wall of the cylinder during the DPF active regeneration process, thereby solving the problem of high risk of engine cylinder pulling and component wear caused by the inability to accurately identify the oil dilution condition in the prior art, reducing the risk of component wear and engine cylinder pulling, and improving the power, emission, and safety of the entire machine and vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings constituting a part of the specification of the application are used to provide further understanding of the application, the illustrative embodiments of the application and the description thereof are used to explain the application, and do not constitute improper limitation on the application. In the drawings:

[0017] Figure 1 A flowchart of a method for determining oil dilution is shown according to an embodiment of the application;

[0018] Figure 2 A flowchart of another method for determining oil dilution is shown according to an embodiment of the application;

[0019] Figure 3 A DOC heat balance diagram is shown according to an embodiment of the application;

[0020] Figure 4 A flowchart of still another method for determining oil dilution is shown according to an embodiment of the application;

[0021] Figure 5 A structural block diagram of a device for determining oil dilution is shown according to an embodiment of the application;

[0022] Figure 6 A structural block diagram of another device for determining oil dilution is shown according to an embodiment of the application.

[0023] Among the above drawings, the following reference signs are included:

[0024] 01, DOC; 02, DOC upstream temperature sensor; 03, DOC downstream temperature sensor. DETAILED DESCRIPTION

[0025] It should be noted that the embodiments and features in the application can be combined with each other without conflict. The technical solutions in the embodiments of the application will be described in detail below with reference to the drawings and in combination with the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, not all embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor should be within the scope of protection of the application.

[0026] In order to enable those skilled in the art to better understand the application scheme, the technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, not all embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor should be within the scope of protection of the application.

[0027] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0028] For ease of description, the following describes some nouns or terms related to the embodiments of the present application:

[0029] DOC: diesel oxidation catalyst, used to convert NO in exhaust gas to NO2, oxidize HC and CO, and provide a diesel combustion environment for DPF regeneration.

[0030] DPF: diesel particulate filter, used to reduce particulate emissions in diesel exhaust pollutants.

[0031] DPF active regeneration: i.e. oil injection regeneration, during the operation of the trap, particulate matter will accumulate in the filter, when it reaches a certain value, it will cause the performance of diesel power and economy to decline, and the deposited particles must be removed in time, which is called DPF active regeneration.

[0032] As introduced in the background art, the existing diesel post-injection method has poor atomization effect, diesel is often sprayed onto the inner wall of the cylinder, the diesel on the inner wall condenses into larger liquid particles, and during the operation of the piston, the oil is returned through the oil ring oil hole, then enters the oil pan through the crankcase, mixes with the oil, dilutes the oil in the oil pan, greatly shortens the service life of the oil, to solve the problem that the existing technology cannot accurately identify the oil dilution condition, causing vehicle component wear and high risk of diesel engine cylinder pulling, the embodiments of the present application provide a method for determining the degree of oil dilution, a device for determining the degree of oil dilution, a computer readable storage medium and an electronic device.

[0033] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application.

[0034] In the present embodiment, a method for determining the degree of oil dilution is provided. It should be noted that the steps shown in the flowchart of the drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0035] Figure 1 is a flow chart of a method for determining oil dilution according to an embodiment of the present application. As shown in Figure 1 , the method comprises the following steps:

[0036] Step S101, determining that the diesel particulate filter enters an active regeneration process, the active regeneration process being a process of removing particles deposited in a filter of the diesel particulate filter by injecting diesel into a cylinder through a post-injection mode;

[0037] Specifically, particulate matter is one of the main pollutants in diesel exhaust emissions. At present, the most effective aftertreatment device for reducing diesel particulate emissions is a wall-flow particulate filter (DPF), i.e., the diesel particulate filter. When the DPF traps particulate matter to a certain limit, measures must be taken to clean the particulate matter, i.e., DPF active regeneration.

[0038] Based on the chemical reaction during the DPF active regeneration process, the amount of diesel injected onto the inner wall of the cylinder can accurately identify the oil dilution condition, reduce the risk of component wear and diesel engine cylinder pulling, and improve the power, emission and safety of the entire machine and vehicle. The total leakage amount is obtained by cumulating the amount of diesel injected onto the inner wall of the cylinder during all DPF active regeneration in the oil replacement period, and the degree of oil dilution is determined according to the amount of leakage.

[0039] The DPF active regeneration needs to inject diesel through in-cylinder post-injection. The diesel burns and releases heat in the DOC, raising the temperature in the DPF to above 500°C, which can remove the particulate matter in the DPF and restore the particulate trapping capacity of the DPF.

[0040] As shown in Figure 2 , determining that the diesel particulate filter enters an active regeneration process comprises the following steps:

[0041] Step S1011, receiving an active regeneration request, the active regeneration request being request information indicating that the diesel particulate filter enters an active regeneration process;

[0042] Step S1012, obtaining performance parameters of an oil injector, the oil injector being an oil injector that injects diesel, the performance parameters of the oil injector at least including one of the following: a wear degree of the oil injector, a clogging degree of the oil injector;

[0043] Step S1013, determining whether the oil injector works normally according to the performance parameters of the oil injector;

[0044] Step S1014, in the case where the oil injector works normally, determining that the diesel particulate filter enters an active regeneration process according to the active regeneration request.

[0045] Specifically, this can determine that the active regeneration process of the diesel particulate filter is normal, and avoid the problem of inaccurate calculation due to injector failure.

[0046] The role of the injector in the DPF active regeneration process is to inject fuel into the particulate filter, increase the temperature of the particulate filter by burning fuel in the particulate filter, promote the oxidation and combustion of particulate matter, and remove the particulate matter accumulated in the particulate filter, thereby achieving the regeneration and cleaning of the particulate filter. This can effectively reduce the particulate matter emissions of diesel vehicles and improve the environmental performance of vehicles.

[0047] Injector wear can affect the active regeneration process of DPF (Diesel Particulate Filter). Injector wear can cause inaccurate fuel injection, affecting engine combustion efficiency and emission quality. This can lead to more particulate matter accumulating in the DPF, reducing its regeneration efficiency and performance. In addition, injector wear can also cause engine instability and emission quality decline, which will indirectly affect the working effect of DPF.

[0048] Injector clogging can affect the active regeneration process of DPF (particulate filter). DPF active regeneration is achieved by injecting fuel into the particulate filter through the injector to increase the temperature of the particulate combustion to remove accumulated particulate matter. If the injector is clogged, the fuel injection amount is insufficient, which may cause the particulate combustion temperature to be insufficient to effectively remove the particulate matter, thereby affecting the normal operation of the DPF. In addition, injector clogging can also cause incomplete combustion of the engine, producing more particulate matter and exacerbating the clogging of the DPF. Therefore, injector clogging has a negative impact on the active regeneration of DPF, affecting the exhaust emissions and performance of the vehicle.

[0049] Step S102, obtaining a first diesel injection amount and a second diesel injection amount, the first diesel injection amount being the total amount of diesel injected into the cylinder by the post-injection method, and the second diesel injection amount being the amount of diesel entering the diesel oxidation catalyst for reaction;

[0050] Specifically, the diesel fuel is injected far behind during the DPF active regeneration to increase the combustion temperature of particulate matter and increase the combustion speed of particulate matter. This helps to clean the particulate matter in the DPF and reduce the emission of emissions. Far behind injection of diesel fuel can create a high-temperature environment inside the DPF to promote the combustion of particulate matter. This combustion can effectively clean the particulate matter in the DPF and restore it to normal working condition. In addition, by far behind injection of diesel fuel, a certain amount of nitrogen oxide can be produced during the combustion process, thereby helping to clean the nitrated particulate matter in the DPF. These measures help to improve the cleaning effect of the DPF and prolong its service life. Based on the chemical reaction during the DPF active regeneration process, the amount of diesel fuel injected onto the inner wall of the cylinder can accurately identify the oil dilution, solve the problem that the existing technology cannot accurately identify the oil dilution, causing the wear of vehicle parts and the high risk of diesel engine cylinder pulling, reduce the wear of parts and the risk of diesel engine cylinder pulling, and improve the power, emission and safety of the whole machine and vehicle.

[0051] However, the existing diesel far behind injection has poor atomization effect, and diesel fuel is often injected onto the inner wall of the cylinder. The diesel fuel on the inner wall condenses into larger liquid particles, and during the operation of the piston, the oil is returned through the oil ring oil hole, then enters the oil pan through the crankcase, mixes with the engine oil, dilutes the engine oil in the oil pan, greatly shortens the service life of the engine oil. At this time, if the engine oil is not replaced in time for further detection at the service station, it will have an adverse effect on the wear parts of the engine camshaft and cylinder liner, and even cause the engine to pull the cylinder.

[0052] However, in the existing scheme, the number of DPF active regeneration is used to judge the degree of oil dilution. Since the initial value of carbon load in the DPF, the DPF regeneration temperature and the DPF regeneration duration during each DPF active regeneration process are inconsistent, and these parameters determine the amount of diesel fuel injected onto the inner wall of the cylinder during DPF regeneration, the scheme of simply relying on the number of DPF active regeneration to judge the degree of oil dilution has poor accuracy and cannot be applied in actual products.

[0053] Therefore, based on the chemical reaction during the DPF active regeneration process, the amount of diesel fuel injected onto the inner wall of the cylinder can accurately identify the oil dilution, reduce the wear of parts and the risk of diesel engine cylinder pulling, and improve the power, emission and safety of the whole machine and vehicle.

[0054] The first diesel injection amount is obtained, including the following steps:

[0055] Step S201, obtaining the actual diesel injection mass flow and the far behind injection duration of the diesel particulate filter during the active regeneration process;

[0056] Step S202, obtaining the first injection amount formula Wherein, q 实际The first diesel injection amount is m 实际 The actual diesel injection mass flow is g / s, and t1 is the post-injection duration, in s.

[0057] Step S203: The first diesel injection amount is determined according to the first injection amount formula.

[0058] Specifically, by accurately determining the total amount of diesel injected into the cylinder through the post-injection method, the basis for accurately calculating the amount of diesel injected onto the inner wall of the cylinder through the post-injection method is laid.

[0059] Based on the chemical reaction calculation of the DPF active regeneration process, the amount of diesel injected onto the inner wall of the cylinder can accurately identify the oil dilution, solve the problem that the prior art cannot accurately identify the oil dilution, leading to high risk of vehicle component wear and diesel engine cylinder pulling, reduce the risk of component wear and diesel engine cylinder pulling, and improve the power, emission and safety of the whole machine and vehicle.

[0060] The second diesel injection amount is obtained, including the following steps:

[0061] Step S301: The DOC heat dissipation, diesel heat value and diesel conversion efficiency are obtained. The DOC heat dissipation is the heat dissipation of the diesel engine oxidation catalyst DOC to the environment, and the diesel conversion efficiency is the conversion efficiency of diesel in the diesel engine oxidation catalyst.

[0062] The DOC heat dissipation is obtained, including the following steps:

[0063] Step S3011: The heat dissipation formula is obtained The DOC heat dissipation is Q 散热 A is the area of the heat dissipation surface, t2 is the target time, in s, μ is the heat dissipation coefficient, in J / (m 2 ·℃), t DOC is the DOC temperature, in ℃, t Env is the ambient temperature, in ℃, wherein the DOC temperature The DOC downstream temperature sensor value is t dowm , in ℃, and the DOC upstream temperature sensor value is t up , in ℃.

[0064] Step S3012: The DOC heat dissipation is determined according to the heat dissipation formula.

[0065] Specifically, since the diesel entering the DOC reacts and releases heat in the DOC, the temperature at the outlet of the DOC is increased, and part of the heat is also dissipated, so according to the heat dissipation of the DOC, the heat release of the diesel reacting in the DOC can be accurately determined, and thus the reaction amount of the diesel entering the DOC for reaction can be determined.

[0066] Based on the chemical reaction condition of the DPF active regeneration process, the amount of diesel sprayed on the inner wall of the cylinder can accurately identify the oil dilution condition, solve the problem that the prior art cannot accurately identify the oil dilution condition, leading to high risk of engine cylinder scoring and high risk of diesel engine cylinder scoring, reduce the risk of part wear and diesel engine cylinder scoring, and improve the power, emission and safety of the whole machine and vehicle.

[0067] Figure 3 It is a DOC heat balance diagram, as shown in Figure 3 , diesel enters the DOC 01 and reacts chemically, wherein the diesel temperature value t up upstream of the DOC is detected by the DOC upstream temperature sensor 02, the diesel temperature value t dowm downstream of the DOC is collected by the DOC downstream temperature sensor 03, and f is the efficiency of the chemical reaction in the DOC. The heat release value of the diesel entering the DOC reacting in the DOC is calculated according to the diesel temperature value upstream of the DOC and the diesel temperature value downstream of the DOC.

[0068] Wherein, the diesel entering the DOC reacts and releases heat in the DOC, increasing the temperature at the outlet of the DOC, and part of the heat is also dissipated. Another form of the heat dissipation formula is Wherein, R is the heat value of diesel, unit: J / g; f is the conversion efficiency of diesel in the DOC, q DOC is the injection amount of diesel entering the DOC, unit: g.

[0069] Step S302, according to the above DOC heat dissipation, determine the diesel heat release, the above diesel heat release is the heat release of diesel in the above diesel engine oxidation catalyst;

[0070] Wherein, according to the above DOC heat dissipation, determine the diesel heat release, including the following steps:

[0071] Step S3021, determine the target time, the target time is the duration that the absolute value of the target temperature difference is less than the temperature limit value, the target temperature difference is the difference between the first temperature detected by the upstream temperature sensor of the diesel engine oxidation catalyst and the second temperature detected by the downstream temperature sensor of the diesel engine oxidation catalyst when the diesel engine particulate filter starts to spray in the far injection mode to the end of the regeneration in the above active regeneration process;

[0072] Step S3022, obtain the heat release formula wherein Q 放热 is the diesel heat release amount, unit: J, C is the specific heat capacity of exhaust gas, unit: J / (kg·℃), t2 is the target time, unit: s, m 排气 is the exhaust mass flow, unit: kg / s, t dowm is the temperature sensor downstream of the DOC, unit: ℃, t up is the temperature sensor upstream of the DOC, unit: ℃, Q 散热 is the heat dissipation amount of the DOC, unit: J;

[0073] Step S3023, determining the diesel heat release amount according to the heat release amount formula and the heat dissipation amount of the DOC.

[0074] Specifically, the diesel heat release amount is accurately obtained, and the injection amount of diesel participating in the chemical reaction in the DOC (i.e., the second diesel injection amount) can be calculated according to the chemical reaction.

[0075] Based on the calculation of the amount of diesel injected onto the inner wall of the cylinder based on the chemical reaction during the DPF active regeneration process, the oil dilution condition can be accurately identified, the problem that the vehicle parts are worn and the diesel engine is at high risk of cylinder scoring due to the inability of the prior art to accurately identify the oil dilution condition is solved, the part wear and the diesel engine cylinder scoring risk are reduced, and the power, emission and safety of the whole machine and vehicle are improved.

[0076] wherein the temperature limit value can generally be 10℃.

[0077] Step S303, obtaining a second injection amount formula wherein q DOC is the second diesel injection amount, Q 放热 is the diesel heat release amount, R is the diesel heat value, and f is the diesel conversion efficiency;

[0078] Step S304, determining the second diesel injection amount according to the second injection amount formula.

[0079] Specifically, after the total amount of diesel injected into the cylinder by the post-injection method and the amount of diesel entering the diesel oxidation catalyst for reaction are accurately determined, the difference between the two is the amount of diesel injected onto the inner wall of the cylinder by the post-injection method.

[0080] wherein the heat dissipation amount formula, the heat release amount formula and the second injection amount formula can obtain

[0081]

[0082] Step S103, obtaining the difference between the first diesel injection amount and the second diesel injection amount, determining the difference as a third diesel injection amount, and determining the dilution degree of the engine oil according to the size of the third diesel injection amount, the third diesel injection amount being the amount of diesel injected onto the inner wall of the cylinder by the post-injection method.

[0083] Specifically, calculating the amount of diesel injected onto the inner wall of the cylinder based on the chemical reaction of the DPF active regeneration process can accurately identify the engine oil dilution, reduce the risk of component wear and diesel engine cylinder pulling, and improve the power, emission and safety of the whole machine and vehicle; all the diesel injected onto the inner wall of the cylinder during the engine oil replacement period is accumulated to obtain the total leakage amount, and the dilution degree of the engine oil is determined according to the amount of leakage.

[0084] Among them, the role of DOC in DPF active regeneration is to act as a catalyst to promote the redox reaction of particulate matter. When the diesel particulate filter (DPF) needs to be actively regenerated, fuel will be injected into the exhaust system, and the fuel will be oxidized by the DOC catalyst to produce high-temperature exhaust gas, thereby promoting the redox reaction of the particulate matter accumulated in the DPF, converting the particulate matter into gaseous products, thereby removing the particulate matter in the DPF and restoring its filtering performance. Therefore, DOC plays an important catalytic role in the DPF active regeneration process.

[0085] Among them, determining the dilution degree of the engine oil according to the size of the third diesel injection amount includes the following steps:

[0086] Step S1031, in the case that the third diesel injection amount is greater than the target threshold, determining that the dilution degree of the engine oil is greater than the target dilution degree and sending a reminder information of replacing the engine oil;

[0087] Step S1032, in the case that the third diesel injection amount is less than or equal to the target threshold, determining that the dilution degree of the engine oil is less than or equal to the target dilution degree.

[0088] Specifically, diesel is injected onto the inner wall of the cylinder, the diesel on the inner wall condenses into larger liquid particles, and during the operation of the piston, the diesel enters the oil pan through the oil ring oil return hole and the crankcase, mixes with the engine oil, dilutes the engine oil in the oil pan, and greatly shortens the service life of the engine oil. At this time, if the engine oil is not replaced in time for further detection and replacement at the service station, it will have an adverse effect on the wear parts of the engine camshaft and cylinder liner, and even cause the engine to pull the cylinder. Therefore, accurately identifying the engine oil dilution can reduce the risk of component wear and diesel engine cylinder pulling, and improve the power, emission and safety of the whole machine and vehicle.

[0089] The method can accurately identify the oil dilution condition by calculating the diesel quantity sprayed on the inner wall of the cylinder based on the chemical reaction condition of the DPF active regeneration process, solve the problem that the prior art cannot accurately identify the oil dilution condition, thereby causing the vehicle component wear and the high diesel engine cylinder pulling risk, reduce the component wear and the diesel engine cylinder pulling risk, and improve the power, emission and safety of the whole machine and vehicle.

[0090] In general, the target threshold is set to 3%-5% of the total oil quantity, and in the actual calculation process, although the actual diesel injection quantity (first diesel injection quantity) of the post-injection in the regeneration process and the diesel quantity (second diesel injection quantity) entering the diesel engine oxidation catalyst for reaction are calculated at the same time, the first diesel injection quantity is calculated first, and then the second diesel injection quantity is calculated, and the subsequent steps are performed after the calculation of the second diesel injection quantity is completed.

[0091] In addition, when the active regeneration request is received, it is first determined whether the oil sprayer is working normally (without wear or blockage failure), and only when the oil sprayer is working normally, the post-injection is started, and the calculation of the oil quantity is performed. When calculating the diesel injection quantity entering the DOC, the integral stop time is determined according to the absolute value of the temperature difference between the upstream and downstream of the DOC being less than a limit value, so that the calculation result is more accurate. In general, one replacement cycle of the oil is a preset mileage or a preset driving time, and there are multiple active regeneration processes in one replacement cycle.

[0092] The method for determining the oil dilution degree provided in the application first determines that the diesel particulate filter enters the active regeneration process, the active regeneration process is a process of spraying diesel into the cylinder by the post-injection method to remove the particles deposited in the filter of the diesel particulate filter; then the first diesel injection quantity and the second diesel injection quantity are obtained, the first diesel injection quantity is the total quantity of diesel injected into the cylinder by the post-injection method, and the second diesel injection quantity is the diesel quantity entering the diesel engine oxidation catalyst for reaction; finally, the difference between the first diesel injection quantity and the second diesel injection quantity is obtained, the difference is determined as the third diesel injection quantity, and the oil dilution degree is determined according to the size of the third diesel injection quantity, the third diesel injection quantity being the diesel quantity sprayed on the inner wall of the cylinder by the post-injection method. The method can accurately identify the oil dilution condition by calculating the diesel quantity sprayed on the inner wall of the cylinder based on the chemical reaction condition of the DPF active regeneration process, solve the problem that the prior art cannot accurately identify the oil dilution condition, thereby causing the vehicle component wear and the high diesel engine cylinder pulling risk, reduce the component wear and the diesel engine cylinder pulling risk, and improve the power, emission and safety of the whole machine and vehicle.

[0093] In order for those skilled in the art to more clearly understand the technical solutions of the present application, the implementation process of the oil dilution determination method of the present application will be described in detail below in conjunction with specific embodiments.

[0094] The present embodiment relates to a specific oil dilution determination method, as shown in the following steps: Figure 4

[0095] Step S1: receiving an active regeneration request, determining whether the fuel injector is working normally, determining the start of active regeneration in the case of normal operation of the fuel injector, and re-receiving the active regeneration request in the case of abnormal operation of the fuel injector;

[0096] Step S2: start calculating the actual diesel injection amount, determine whether the active regeneration is over, and stop the post-injection if yes, otherwise, continue to integrate the actual diesel injection amount of the post-injection during the regeneration process;

[0097] Step S3: start calculating the diesel injection amount of the DOC, determine whether the post-injection is stopped and the absolute value of the temperature sensor difference between the upstream and downstream of the DOC is less than the limit value, if yes, calculate the diesel injection amount of the DOC during the regeneration process, otherwise, continue to integrate the diesel injection amount of the DOC during the regeneration process;

[0098] Step S4: calculate the amount of diesel injected onto the inner wall of the cylinder during the current active regeneration process, and calculate the total amount of diesel injected onto the inner wall of the cylinder during the DPF active regeneration in the oil replacement period;

[0099] Step S5: determine whether the total amount of diesel injected onto the inner wall of the cylinder during the DPF active regeneration exceeds the limit value, if yes, determine that the oil dilution exceeds the standard, and send a reminder to replace the oil, otherwise, continue to determine whether the total amount of diesel injected onto the inner wall of the cylinder during the DPF active regeneration exceeds the limit value.

[0100] It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described herein can be executed in an order different from that shown herein.

[0101] ​The embodiment of the present application further provides a device for determining oil dilution. It should be noted that the device for determining oil dilution can be used to execute the method for determining oil dilution. The device is used to realize the above-mentioned embodiment and preferred embodiment, and the description is not repeated. As used below, the term "module" can be a combination of software and / or hardware that realizes a predetermined function. Although the device described in the following embodiment is preferably realized in software, the realization of hardware or a combination of software and hardware is also possible and is conceived.

[0102] The device for determining oil dilution provided by the embodiment of the present application is introduced below.

[0103] Figure 5 is a schematic diagram of the device for determining oil dilution according to the embodiment of the present application. As shown in Figure 5 the device includes a determining unit 10, a first acquiring unit 20 and a second acquiring unit 30. The determining unit 10 is used to determine that the diesel particulate filter enters an active regeneration process. The active regeneration process is a process of removing the particles deposited in the filter of the diesel particulate filter by injecting diesel into the cylinder through a post-injection method. The first acquiring unit 20 is used to acquire a first diesel injection amount and a second diesel injection amount. The first diesel injection amount is the total amount of diesel injected into the cylinder through the post-injection method. The second diesel injection amount is the amount of diesel entering the diesel oxidation catalyst for reaction. The second acquiring unit 30 is used to acquire the difference between the first diesel injection amount and the second diesel injection amount. The difference is determined as a third diesel injection amount, which is the amount of diesel injected onto the inner wall of the cylinder through the post-injection method. According to the size of the third diesel injection amount, the dilution of the oil is determined.

[0104] The above oil dilution determination device of the application comprises a determination unit, a first acquisition unit and a second acquisition unit. The determination unit is configured to determine that the diesel particulate filter enters an active regeneration process, and the active regeneration process is a process of injecting diesel into the cylinder by the post-injection method to remove the particles deposited in the filter of the diesel particulate filter. The first acquisition unit is configured to acquire a first diesel injection amount and a second diesel injection amount. The first diesel injection amount is the total amount of diesel injected into the cylinder by the post-injection method, and the second diesel injection amount is the amount of diesel entering the diesel oxidation catalyst for reaction. The second acquisition unit is configured to acquire the difference between the first diesel injection amount and the second diesel injection amount, determine the difference as a third diesel injection amount, and determine the dilution of the oil according to the size of the third diesel injection amount. The third diesel injection amount is the amount of diesel injected onto the inner wall of the cylinder by the post-injection method. The device can accurately identify the oil dilution condition by calculating the amount of diesel injected onto the inner wall of the cylinder based on the chemical reaction condition of the DPF active regeneration process, solve the problem that the prior art cannot accurately identify the oil dilution condition, leading to high risk of vehicle component wear and diesel engine cylinder pulling, reduce the risk of component wear and diesel engine cylinder pulling, and improve the power, emission and safety of the whole machine and vehicle.

[0105] In some optional examples, as shown in Figure 6 The first acquisition unit comprises a first acquisition module 21, a second acquisition module 22 and a first determination module 23. The first acquisition module 21 is configured to acquire an actual diesel injection mass flow and a post-injection duration of the diesel particulate filter in the active regeneration process. The second acquisition module 22 is configured to acquire a first injection amount formula wherein q 实际 is the first diesel injection amount, m 实际 is the actual diesel injection mass flow, the unit is g / s; t1 is the post-injection duration, the unit is s; and the first determination module 23 is configured to determine the first diesel injection amount according to the first injection amount formula. By accurately determining the total amount of diesel injected into the cylinder by the post-injection method, a foundation is laid for accurately calculating the amount of diesel injected onto the inner wall of the cylinder by the post-injection method.

[0106] In some optional examples, the first acquisition unit comprises a third acquisition module, a second determination module, a fourth acquisition module and a third determination module. The third acquisition module is configured to acquire a DOC heat dissipation amount, a diesel heat value and a diesel conversion efficiency. The DOC heat dissipation amount is the heat dissipation amount of the diesel oxidation catalyst DOC to the environment, and the diesel conversion efficiency is the conversion efficiency of diesel in the diesel oxidation catalyst. The second determination module is configured to determine a diesel heat release amount according to the DOC heat dissipation amount. The diesel heat release amount is the heat release amount of diesel in the diesel oxidation catalyst. The fourth acquisition module is configured to acquire a second injection amount formula wherein qDOC For the second diesel injection quantity mentioned above, Q 放热 R is the calorific value of the diesel fuel, and f is the conversion efficiency of the diesel fuel. The third determining module is used to determine the second diesel fuel injection quantity according to the second injection quantity formula. After accurately determining the total amount of diesel fuel injected into the cylinder via the remote rear injection method and the amount of diesel fuel entering the diesel engine oxidation catalyst for reaction, the difference between the two is the amount of diesel fuel injected onto the inner wall of the cylinder via the remote rear injection method.

[0107] In some optional examples, the second determining module includes a first determining submodule, a first acquiring submodule, and a second determining submodule. The first determining submodule is used to determine a target time, which is the duration for which the absolute value of the target temperature difference is less than a temperature limit. The target temperature difference is the difference between the first temperature detected by the upstream temperature sensor of the diesel engine oxidation catalyst and the second temperature detected by the downstream temperature sensor of the diesel engine oxidation catalyst during the active regeneration process, from the start of far-back injection to the completion of regeneration. The first acquiring submodule is used to acquire the heat release formula. Among them, Q 放热 The above refers to the calorific value of diesel fuel, in J; C is the specific heat capacity of exhaust gas, in J / (kg·℃); t2 is the target time, in seconds; m_exhaust gas is the exhaust gas mass flow rate, in kg / s; t dowm The values ​​are collected by the downstream temperature sensor of DOC, in °C and t. up The value is collected by the upstream temperature sensor of DOC, in °C, Q. 散热 The heat dissipation of the aforementioned DOC is expressed in J; the second determining submodule is used to determine the heat release of the aforementioned diesel fuel based on the aforementioned heat release formula and the aforementioned heat dissipation of the aforementioned DOC. By accurately obtaining the heat release of the diesel fuel, the injection quantity of diesel fuel participating in the chemical reaction in the DOC (i.e., the second diesel fuel injection quantity) can be calculated based on the chemical reaction.

[0108] In this embodiment, the third acquisition module includes a second acquisition submodule and a third determination submodule. The second acquisition submodule is used to acquire the heat dissipation formula. Among them, Q 散热 The above refers to the heat dissipation of DOC, where A is the area of ​​the heat dissipation surface, t2 is the target time in seconds, and μ is the heat dissipation coefficient in J / (m²). 2 ·℃), t DOC Temperature (DOC) is expressed in °C (°C) or t (t). Env The ambient temperature is expressed in °C, where the above DOC temperature... Among them, t dowm The values ​​are collected by the downstream temperature sensor of DOC, in °C and t. upThe DOC upstream temperature sensor collects a value in ℃; the third determination sub-module is configured to determine the DOC heat dissipation according to the heat dissipation formula. Since the diesel entering the DOC is exothermic in the DOC, the temperature at the DOC outlet is increased, and part of the heat is also dissipated. Therefore, according to the DOC heat dissipation, the exothermic amount of the diesel reacting in the DOC can be accurately determined, and thus the reaction amount of the diesel entering the DOC for reaction can be determined.

[0109] In an optional solution, the determination unit includes a receiving module, a fifth acquisition module, a fourth determination module, and a fifth determination module. The receiving module is configured to receive an active regeneration request, which is request information indicating that the diesel particulate filter enters an active regeneration process. The fifth acquisition module is configured to acquire a performance parameter of an oil injector, which is an injector for injecting diesel. The performance parameter of the oil injector includes at least one of the following: a wear degree of the oil injector and a clogging degree of the oil injector. The fourth determination module is configured to determine whether the oil injector is working normally according to the performance parameter of the oil injector. The fifth determination module is configured to determine that the diesel particulate filter enters the active regeneration process according to the active regeneration request when the oil injector is working normally. In this way, it can be determined that the active regeneration process of the diesel particulate filter is normal, and the problem of inaccurate calculation caused by oil injector failure can be avoided.

[0110] As an optional solution, the second acquisition unit includes a sixth determination module and a seventh determination module. The sixth determination module is configured to determine that the dilution degree of the engine oil is greater than a target dilution degree and send a reminder information for replacing the engine oil when the third diesel injection amount is greater than a target threshold. The seventh determination module is configured to determine that the dilution degree of the engine oil is less than or equal to the target dilution degree when the third diesel injection amount is less than or equal to the target threshold. The diesel is sprayed onto the inner wall of the cylinder, the diesel on the inner wall condenses into larger liquid particles, and during the operation of the piston, the diesel enters the oil sump through the oil ring oil return hole and the crankcase, mixes with the engine oil, dilutes the engine oil in the oil sump, and greatly shortens the service life of the engine oil.

[0111] The determination device of the dilution degree of the engine oil includes a processor and a memory. The determination unit and the like are stored in the memory as program units, and the corresponding functions are realized by the processor executing the program units stored in the memory. The modules are located in the same processor; or the modules are located in different processors in any combination.

[0112] The processor includes a core, and the core retrieves the corresponding program unit from the memory. The core can be set to one or more, and the problem that the existing technology cannot accurately identify the engine oil dilution condition, resulting in high risk of diesel engine cylinder pulling and wear of vehicle parts, can be solved by adjusting the core parameters.

[0113] The memory can include non-persistent memory in computer readable media, random access memory (RAM), and / or non-volatile memory such as read-only memory (ROM) or flash memory, and the memory includes at least one memory chip.

[0114] The embodiment of the present application provides a computer readable storage medium, the computer readable storage medium comprises a stored program, wherein the program controls the device where the computer readable storage medium is located to execute the determination method of the dilution degree of engine oil when the program runs.

[0115] Specifically, the determination method of the dilution degree of engine oil comprises:

[0116] Step S101, determining that the diesel particulate filter enters an active regeneration process, and the active regeneration process is a process of injecting diesel into a cylinder through a post-injection mode to remove particles deposited in a filter of the diesel particulate filter;

[0117] Specifically, the particulate matter is one of the main pollutants in diesel exhaust emissions, and the most effective aftertreatment device for reducing diesel particulate emissions at present is a wall-flow particulate filter (DPF), that is, the diesel particulate filter. When the DPF traps particulate matter to a certain limit value, measures are taken to clean the particulate matter, that is, DPF active regeneration.

[0118] Step S102, acquiring a first diesel injection amount and a second diesel injection amount, the first diesel injection amount being a total amount of diesel injected into the cylinder through the post-injection mode, and the second diesel injection amount being an amount of diesel entering the diesel oxidation catalyst for reaction;

[0119] Specifically, the diesel is injected through the post-injection mode during DPF active regeneration to increase the combustion temperature of the particulate matter and increase the combustion speed of the particulate matter. This helps to remove the particulate matter in the DPF and reduce the emission of the emission. The post-injection of diesel can create a high-temperature environment inside the DPF to promote the combustion of the particulate matter. This combustion can effectively remove the particulate matter in the DPF and restore it to normal working condition.

[0120] Step S103, acquiring a difference between the first diesel injection amount and the second diesel injection amount, determining a third diesel injection amount as the difference, and determining the dilution degree of engine oil according to the size of the third diesel injection amount, and the third diesel injection amount is an amount of diesel injected onto the inner wall of the cylinder through the post-injection mode.

[0121] Specifically, calculating the amount of diesel fuel injected onto the inner wall of the cylinder based on the chemical reaction during the DPF active regeneration process can accurately identify oil dilution, reduce component wear and diesel engine cylinder pulling risk, and improve the power, emission and safety of the entire machine and vehicle. The total leakage amount is obtained by accumulating the amount of diesel fuel injected onto the inner wall of the cylinder during DPF active regeneration in the oil replacement cycle, and the degree of oil dilution is determined according to the amount of leakage.

[0122] The embodiment of the present application provides a processor for running a program, wherein the program performs the method for determining the degree of oil dilution when running.

[0123] Specifically, the method for determining the degree of oil dilution comprises:

[0124] Step S101, determining that the diesel particulate filter enters an active regeneration process, the active regeneration process being a process of injecting diesel fuel into the cylinder through post-injection to remove the particles deposited in the filter of the diesel particulate filter;

[0125] Specifically, particulate matter is one of the main pollutants in diesel exhaust emissions. At present, the most effective aftertreatment device for reducing diesel particulate emissions is a wall-flow particulate filter (DPF), i.e. the diesel particulate filter. When the DPF captures particulate matter to a certain limit, measures must be taken to clean the particulate matter, i.e. DPF active regeneration.

[0126] Step S102, obtaining a first diesel injection amount and a second diesel injection amount, the first diesel injection amount being the total amount of diesel fuel injected into the cylinder through post-injection, and the second diesel injection amount being the amount of diesel fuel entering the diesel oxidation catalyst for reaction;

[0127] Specifically, the diesel fuel is injected through post-injection during DPF active regeneration to increase the combustion temperature of particulate matter and increase the combustion speed of particulate matter. This helps to remove particulate matter in the DPF and reduce emissions. Post-injection of diesel fuel can create a high-temperature environment inside the DPF, promoting the combustion of particulate matter. This combustion can effectively remove particulate matter in the DPF, restoring it to normal operating conditions.

[0128] Step S103, obtaining the difference between the first diesel injection amount and the second diesel injection amount, determining the third diesel injection amount as the difference, and determining the degree of oil dilution according to the size of the third diesel injection amount, the third diesel injection amount being the amount of diesel fuel injected onto the inner wall of the cylinder through post-injection.

[0129] Specifically, calculating the diesel amount injected onto the inner wall of the cylinder based on the chemical reaction condition of the DPF active regeneration process can accurately identify the oil dilution condition, reduce the component wear and the diesel engine cylinder pulling risk, and improve the power, emission and safety of the whole machine and vehicle; the total leakage amount is obtained by accumulating all the diesel amounts injected onto the inner wall of the cylinder during the oil replacement period, and the oil dilution degree is judged according to the leakage amount.

[0130] The embodiment of the present application provides a device, which comprises a processor, a memory and a program stored on the memory and executable on the processor, and at least the following steps are implemented when the processor executes the program:

[0131] Step S101, determining that the diesel particulate filter enters an active regeneration process, and the active regeneration process is a process of injecting diesel into a cylinder by a post-injection method to remove the particles deposited in a filter of the diesel particulate filter;

[0132] Step S102, acquiring a first diesel injection amount and a second diesel injection amount, the first diesel injection amount is the total amount of diesel injected into the cylinder by the post-injection method, and the second diesel injection amount is the diesel amount entering a diesel oxidation catalyst for reaction;

[0133] Step S103, acquiring a difference between the first diesel injection amount and the second diesel injection amount, determining a third diesel injection amount according to the difference, and determining the dilution degree of oil according to the third diesel injection amount, and the third diesel injection amount is the diesel amount injected onto the inner wall of the cylinder by the post-injection method.

[0134] The device herein can be a server, a PC, a PAD, a mobile phone or the like.

[0135] The present application also provides a computer program product, which is suitable for executing the program initialized with at least the following method steps when executed on a data processing device:

[0136] Step S101, determining that the diesel particulate filter enters an active regeneration process, and the active regeneration process is a process of injecting diesel into a cylinder by a post-injection method to remove the particles deposited in a filter of the diesel particulate filter;

[0137] Step S102, acquiring a first diesel injection amount and a second diesel injection amount, the first diesel injection amount is the total amount of diesel injected into the cylinder by the post-injection method, and the second diesel injection amount is the diesel amount entering a diesel oxidation catalyst for reaction;

[0138] Step S103, obtaining the difference between the first diesel injection amount and the second diesel injection amount, determining the third diesel injection amount as the difference, and determining the dilution of the oil according to the third diesel injection amount, the third diesel injection amount being the amount of diesel injected onto the inner wall of the cylinder by the post-injection method.

[0139] It is apparent that those skilled in the art should understand that the modules or steps of the present application described above can be realized by using general computing devices, which can be centralized on a single computing device or distributed on a network composed of multiple computing devices, and can be realized by using program codes executable by the computing devices, so that they can be stored in storage devices and executed by the computing devices, and in some cases, the steps shown or described can be executed in different orders, or they can be respectively manufactured into individual integrated circuit modules, or multiple modules or steps can be manufactured into a single integrated circuit module. Thus, the present application is not limited to any specific combination of hardware and software.

[0140] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage, etc.) containing computer-usable program code.

[0141] The present application is described with reference to flowcharts and / or block diagrams according to the methods, devices (systems), and computer program products of the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of flows and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing apparatus to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing apparatus produce a device that implements the functions specified in the flowcharts and / or block diagrams. Figure 1 The functions specified in a flow or multiple flows and / or blocks Figure 1 The device that implements the functions specified in a flow or multiple flows and / or blocks.

[0142] These computer program instructions can also be stored in a computer-readable memory that can direct the computer or other programmable data processing apparatus to work in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including instruction devices that implement the functions specified in the flowcharts and / or block diagrams. Figure 1 The functions specified in a flow or multiple flows and / or blocks Figure 1the function(s) specified in the block or blocks.

[0143] These computer program instructions can also be loaded into computer or other programmable data processing devices to cause a series of operational steps to be performed on the computer or other programmable devices to produce a computer implemented process such that the instructions which execute on the computer or other programmable devices provide steps for implementing the flowchart Figure 1 one or more flowcharts and / or blocks Figure 1 the function(s) specified in the block or blocks.

[0144] In one typical configuration, the computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0145] The memory can include non-persistent memory and / or volatile memory, such as random access memory (RAM) about which the computer stores information such as computer program instructions. Memory is an example of computer readable media.

[0146] Computer readable media includes permanent and non-permanent, movable and non-movable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read only memory (ROM), electrically erasable programmable read only memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette, magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. According to the definition herein, computer readable media does not include transitory media, such as modulated data signals and carrier waves.

[0147] It should also be noted that the terms "comprising", "including", or any other variant thereof are intended to cover non-exclusive inclusions, so that processes, methods, articles or devices that include a series of elements not only include those elements, but also include other elements not explicitly listed, or inherent to such processes, methods, articles or devices. Without more limitations, the element defined by the statement "including a" does not exclude the presence of additional identical elements in the process, method, article or device including the element.

[0148] From the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects:

[0149] 1) The above-mentioned method for determining the dilution degree of engine oil of the present application first determines that the diesel particulate filter enters an active regeneration process, the active regeneration process being a process of injecting diesel into the cylinder through the post-injection method to remove the particles deposited in the filter of the diesel particulate filter; then acquires a first diesel injection amount and a second diesel injection amount, the first diesel injection amount being the total amount of diesel injected into the cylinder through the post-injection method, and the second diesel injection amount being the amount of diesel entering the diesel oxidation catalyst for reaction; finally, acquires the difference between the first diesel injection amount and the second diesel injection amount, determines the difference as a third diesel injection amount, and determines the dilution degree of engine oil according to the size of the third diesel injection amount, the third diesel injection amount being the amount of diesel injected onto the inner wall of the cylinder through the post-injection method. This method can accurately identify the dilution condition of engine oil based on the calculation of the amount of diesel injected onto the inner wall of the cylinder through the post-injection method according to the chemical reaction condition of the DPF active regeneration process, solves the problem that the prior art cannot accurately identify the dilution condition of engine oil, leading to high risk of engine cylinder pulling and part wear, reduces the risk of engine cylinder pulling and part wear, and improves the power, emission and safety of the entire machine and vehicle.

[0150] 2) The above-mentioned device for determining the dilution degree of engine oil of the present application comprises a determination unit, a first acquisition unit and a second acquisition unit, the determination unit is used to determine that the diesel particulate filter enters an active regeneration process, the active regeneration process being a process of injecting diesel into the cylinder through the post-injection method to remove the particles deposited in the filter of the diesel particulate filter; the first acquisition unit is used to acquire a first diesel injection amount and a second diesel injection amount, the first diesel injection amount being the total amount of diesel injected into the cylinder through the post-injection method, and the second diesel injection amount being the amount of diesel entering the diesel oxidation catalyst for reaction; and the second acquisition unit is used to acquire the difference between the first diesel injection amount and the second diesel injection amount, determine the difference as a third diesel injection amount, and determine the dilution degree of engine oil according to the size of the third diesel injection amount, the third diesel injection amount being the amount of diesel injected onto the inner wall of the cylinder through the post-injection method. This device can accurately identify the dilution condition of engine oil based on the calculation of the amount of diesel injected onto the inner wall of the cylinder through the post-injection method according to the chemical reaction condition of the DPF active regeneration process, solves the problem that the prior art cannot accurately identify the dilution condition of engine oil, leading to high risk of engine cylinder pulling and part wear, reduces the risk of engine cylinder pulling and part wear, and improves the power, emission and safety of the entire machine and vehicle.

[0151] The above-mentioned only for the preferred embodiments of the present application, and not for limiting the present application, for those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A method for determining the dilution ratio of engine oil, characterized in that, include: The diesel particulate filter is determined to enter the active regeneration process, which is the process of injecting diesel fuel into the cylinder through a remote rear injection method to remove the particles deposited in the filter of the diesel particulate filter. The first diesel injection quantity and the second diesel injection quantity are obtained. The first diesel injection quantity is the total amount of diesel injected into the cylinder through the remote rear injection method, and the second diesel injection quantity is the amount of diesel entering the diesel engine oxidation catalyst for reaction. The difference between the first diesel injection quantity and the second diesel injection quantity is obtained, and the difference is determined as the third diesel injection quantity. Based on the magnitude of the third diesel injection quantity, the oil dilution is determined. The third diesel injection quantity is the amount of diesel injected onto the inner wall of the cylinder through a remote rear injection method. If the cumulative amount of all the third diesel injection quantities within the oil change cycle is greater than the target threshold, the oil dilution is determined to be greater than the target dilution and an oil change reminder message is sent. Obtaining the second diesel injection quantity includes: A target time is determined, which is the duration during which the absolute value of the target temperature difference is less than the temperature limit. The target temperature difference is the difference between the first temperature detected by the upstream temperature sensor of the diesel engine oxidation catalyst and the second temperature detected by the downstream temperature sensor of the diesel engine oxidation catalyst when the diesel particulate filter starts to inject in the far-back injection mode during the active regeneration process and the regeneration is completed. The heat dissipation of the DOC is determined based on the area of ​​the heat dissipation surface, the target time, the heat dissipation coefficient, the DOC temperature, and the ambient temperature. The heat release of diesel fuel is determined based on the specific heat capacity of the exhaust gas, the target time, the exhaust gas mass flow rate, the temperature sensor reading downstream of the DOC, the temperature sensor reading upstream of the DOC, and the heat dissipation of the DOC. The corresponding second diesel injection quantity is determined based on the heat release of the diesel fuel.

2. The determination method according to claim 1, characterized in that, Obtaining the first diesel injection quantity includes: Obtain the actual diesel injection mass flow rate and the far-back injection duration of the diesel particulate filter during the active regeneration process; Formula for obtaining the first injection volume ,in, This refers to the first diesel injection quantity. The actual diesel injection mass flow rate is expressed in g / s. The duration of the far-back spray is expressed in seconds. The first diesel injection quantity is determined according to the first injection quantity formula.

3. The determination method according to claim 1, characterized in that, Determining the corresponding second diesel injection quantity based on the heat release of the diesel fuel includes: The calorific value and conversion efficiency of diesel fuel are obtained, wherein the conversion efficiency of diesel fuel in the diesel engine oxidation catalyst is the conversion efficiency of diesel fuel. Formula for obtaining the second injection volume ,in, This refers to the second diesel injection quantity. R is the heat release of the diesel fuel, and R is the calorific value of the diesel fuel. The diesel conversion efficiency is mentioned above. The second diesel injection quantity is determined according to the second injection quantity formula.

4. The determination method according to claim 1, characterized in that, The heat release of diesel fuel is determined based on the exhaust specific heat capacity, the target time, the exhaust mass flow rate, the temperature sensor readings downstream of the DOC, the temperature sensor readings upstream of the DOC, and the heat dissipation of the DOC, including: Formula for obtaining heat release ,in, The heat release of the diesel fuel is expressed in J, and C is the exhaust specific heat capacity, expressed in kilometres per cubic meter (kJ). , The target time is given in seconds. This refers to the exhaust gas mass flow rate, expressed in kg / s. The values ​​are from the downstream temperature sensor of the DOC, in °C. The temperature readings are from the upstream temperature sensor of the DOC, in °C. The heat dissipation of the DOC is expressed in J. The heat release of the diesel fuel is determined based on the heat release formula and the DOC heat dissipation.

5. The determination method according to claim 1, characterized in that, The heat dissipation of the DOC is determined based on the area of ​​the heat dissipation surface, the target time, the heat dissipation coefficient, the DOC temperature, and the ambient temperature, including: Formula for obtaining heat dissipation ,in, The heat dissipation of the DOC is given by A, where A is the area of ​​the heat dissipation surface. The target time is in seconds. The heat dissipation coefficient is expressed in units of 1000 ppm. , DOC temperature, in °C. The ambient temperature is expressed in °C, where the DOC temperature is... ,in, The values ​​are from the downstream temperature sensor of the DOC, in °C. The temperature data is collected by the upstream temperature sensor of the DOC, and the unit is °C. The heat dissipation of the DOC is determined according to the heat dissipation formula.

6. The determination method according to claim 1, characterized in that, Determining when the diesel engine particulate filter enters the active regeneration process includes: Receive an active regeneration request, wherein the active regeneration request is a request message instructing the diesel particulate filter to enter the active regeneration process; Obtain the performance parameters of the fuel injector, wherein the fuel injector is a fuel injector that injects diesel fuel, and the performance parameters of the fuel injector include at least one of the following: the degree of wear of the fuel injector, the degree of clogging of the fuel injector; Determine whether the injector is working properly based on its performance parameters; When the injector is operating normally, the diesel particulate filter is determined to enter the active regeneration process based on the active regeneration request.

7. The determination method according to claim 1, characterized in that, The oil dilution is determined based on the magnitude of the third diesel injection quantity, including: If the cumulative amount of all the third diesel injections within the oil change cycle is less than or equal to the target threshold, the oil dilution is determined to be less than or equal to the target dilution.

8. An apparatus for determining the oil dilution ratio for performing the method according to any one of claims 1 to 7, characterized in that, include: The determining unit is used to determine when the diesel particulate filter enters the active regeneration process, which is the process of injecting diesel fuel into the cylinder through a remote rear injection method to remove the particles deposited in the filter of the diesel particulate filter. The first acquisition unit is used to acquire the first diesel injection quantity and the second diesel injection quantity. The first diesel injection quantity is the total amount of diesel injected into the cylinder through a remote rear injection method, and the second diesel injection quantity is the amount of diesel entering the diesel engine oxidation catalyst for reaction. The second acquisition unit is used to acquire the difference between the first diesel injection quantity and the second diesel injection quantity, determine the difference as the third diesel injection quantity, and determine the oil dilution degree according to the magnitude of the third diesel injection quantity. The third diesel injection quantity is the amount of diesel injected onto the inner wall of the cylinder through a remote rear injection method.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, wherein, when the program is executed, it controls the device on which the computer-readable storage medium is located to perform the method for determining the oil dilution ratio as described in any one of claims 1 to 7.

10. An electronic device, characterized in that, include: One or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including a method for performing the determination of oil dilution as described in any one of claims 1 to 7.

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