Protection method of methanol engine, electronic control unit and vehicle

Abstract

The invention discloses a protection method for a methanol engine, an electronic control unit and a vehicle, relates to the field of internal combustion engines, and aims to provide a protection method for a methanol engine when a crankcase of the engine is cleaned according to formic acid concentration and water content in the crankcase of the engine on the premise of determining that the engine meets a crankcase cleaning condition. According to the current formic acid concentration and the current water content, the target cleaning strength and the target injection strength can be determined, a crankshaft of an engine is dragged by a power battery to operate according to the target cleaning strength, and an injector is controlled to inject dry gas into an air cylinder according to the target injection strength; and the target cleaning strength and the target spraying strength are dynamically adjusted according to the change conditions of the formic acid concentration and the water content, and engine cleaning treatment is stopped until the formic acid concentration and the water content in the crankcase meet the cleaning treatment stopping conditions. The formic acid concentration and the water content in the engine crankcase are maintained within a safe range, the hidden danger of corrosion is eliminated, and the reliability of the whole engine is improved.

Description

Technical Field

[0001] The present application relates to the technical field of internal combustion engines, and in particular to a protection method, an electronic control unit, and a vehicle for a methanol engine. Background Art

[0002] Methanol engines use methanol as their primary fuel. Methanol combustion significantly reduces pollutants, effectively lowering emissions of sulfur oxides, nitrogen oxides, and particulate matter, helping to improve air quality and reduce greenhouse gas emissions. However, during operation, cylinder lining corrosion is common in methanol engines. Effectively reducing this corrosion and improving overall reliability have become pressing challenges. Summary of the Invention

[0003] In view of the above problems, this application provides a methanol engine protection method, electronic control unit, and vehicle to achieve the purpose of reducing corrosion and improving the reliability of the entire engine. The specific solution is as follows:

[0004] In a first aspect, the present application provides a methanol engine protection method, comprising:

[0005] determining whether the methanol engine meets crankcase cleaning conditions;

[0006] When it is determined that the methanol engine meets the crankcase cleaning condition, determining whether to clean the crankcase of the methanol engine according to the formic acid concentration and water content in the crankcase of the methanol engine;

[0007] When determining to perform a cleaning process on the crankcase of the methanol engine, at least one cleaning process cycle is performed until the formic acid concentration and the water content in the crankcase meet the conditions for stopping the cleaning process. Each cleaning process cycle includes: driving the crankshaft of the methanol engine to operate according to a target cleaning intensity through a power battery, and controlling the injector to inject dry gas into the cylinder according to a target injection intensity. The target cleaning intensity is: a cleaning intensity determined based on the current formic acid concentration and the current water content corresponding to the current cleaning process cycle, and the target injection intensity is an injection intensity determined based on the current formic acid concentration and the current water content.

[0008] In a possible implementation, the target scavenging intensity includes the rotational speed of the crankshaft, the target injection intensity includes the gas flow rate, and the process of determining the target scavenging intensity and the target injection intensity includes:

[0009] The rotational speed of the crankshaft and the gas flow rate are determined based on the comparison result data between the current formic acid concentration and the formic acid concentration threshold, and the comparison result data between the current water content and the water content threshold.

[0010] In one possible implementation, determining the crankshaft speed and the gas flow rate based on the comparison result data between the current formic acid concentration and the formic acid concentration threshold, and the comparison result data between the current water content and the water content threshold, includes:

[0011] If the current formic acid concentration is not less than the formic acid concentration threshold, and the current water content is not less than the water content threshold, the rotational speed of the crankshaft is a first rotational speed, and the gas flow rate is a first flow rate.

[0012] In one possible implementation, determining the crankshaft speed and the gas flow rate based on the comparison result data between the current formic acid concentration and the formic acid concentration threshold, and the comparison result data between the current water content and the water content threshold, further includes:

[0013] If the current formic acid concentration is not less than the formic acid concentration threshold, and the current water content is less than the water content threshold, the crankshaft speed is a second speed, the gas flow rate is a second flow rate, the second speed is less than the first speed, and the second flow rate is less than the first flow rate.

[0014] In one possible implementation, determining the crankshaft speed and the gas flow rate based on the comparison result data between the current formic acid concentration and the formic acid concentration threshold, and the comparison result data between the current water content and the water content threshold, further includes:

[0015] If the current formic acid concentration is less than the formic acid concentration threshold and the current water content is not less than the water content threshold, the crankshaft speed is a third speed, the gas flow rate is a third flow rate, the third speed is less than the second speed, and the third flow rate is less than the second flow rate.

[0016] In a possible implementation, determining whether to clean the crankcase of the methanol engine according to the formic acid concentration and the water content in the crankcase of the methanol engine includes:

[0017] If the formic acid concentration is not less than the formic acid concentration threshold, or the water content is not less than the water content threshold, it is determined that the crankcase of the methanol engine needs to be cleaned.

[0018] In a possible implementation, the cleaning stop condition includes:

[0019] The formic acid concentration is less than the formic acid concentration threshold, and the water content is less than the water content threshold.

[0020] In one possible implementation, determining whether the methanol engine meets the crankcase cleaning condition includes:

[0021] If the engine is shut down and the crankshaft does not stop rotating after receiving the stop command, it is determined that the methanol engine meets the crankcase cleaning condition.

[0022] A second aspect of the present application provides an electronic control unit, comprising at least one processor and a memory connected to the processor, wherein:

[0023] The memory is used to store computer programs;

[0024] The processor is used to execute the computer program so that the electronic control unit can implement the methanol engine protection method as described in the first aspect or any implementation of the first aspect.

[0025] A third aspect of the present application provides a vehicle, comprising: an electronic control unit as described in the second aspect above.

[0026] A fourth aspect of the present application provides a methanol engine protection device, comprising:

[0027] a cleaning condition judgment module, configured to determine whether the methanol engine meets the crankcase cleaning conditions;

[0028] a cleaning start determination module, configured to determine whether to perform cleaning on the crankcase of the methanol engine based on the formic acid concentration and water content in the crankcase of the methanol engine when the cleaning condition judgment module determines that the methanol engine meets the crankcase cleaning condition; and

[0029] A crankcase cleaning execution module is used to execute at least one cleaning process cycle until the formic acid concentration and water content in the crankcase meet the conditions for stopping the cleaning process when the cleaning start determination module determines that the crankcase of the methanol engine is to be cleaned. Each cleaning process cycle includes: driving the crankshaft of the methanol engine to operate according to a target cleaning intensity through a power battery, and controlling the injector to inject dry gas into the cylinder according to a target injection intensity. The target cleaning intensity is: a cleaning intensity determined based on a current formic acid concentration and a current water content corresponding to the current cleaning process cycle, and the target injection intensity is an injection intensity determined based on the current formic acid concentration and the current water content.

[0030] In a fifth aspect, the present application provides a computer program product comprising computer-readable instructions. When the computer-readable instructions are executed on an electronic device, the electronic device implements the methanol engine protection method of the first aspect or any implementation of the first aspect.

[0031] In a sixth aspect, the present application provides a computer storage medium carrying one or more computer programs. When the one or more computer programs are executed by an electronic device, the electronic device can implement the methanol engine protection method of the first aspect or any implementation of the first aspect.

[0032] By means of the above technical solution, the present application provides a methanol engine protection method. Under the premise of determining that the engine meets the crankcase cleaning conditions, the engine crankcase can be cleaned according to the formic acid concentration and water content in the engine crankcase. The method can determine the target cleaning intensity and target injection intensity based on the current formic acid concentration and current water content. The power battery drives the engine crankshaft to operate according to the target cleaning intensity and controls the injector to inject dry gas into the cylinder according to the target injection intensity. The target cleaning intensity and target injection intensity are dynamically adjusted according to changes in the formic acid concentration and water content until the formic acid concentration and water content in the crankcase meet the conditions for stopping the cleaning process. The engine cleaning and injection process are stopped. The formic acid concentration and water content in the engine crankcase are maintained within a safe range, effectively eliminating the hidden dangers of electrochemical corrosion and improving the reliability of the entire engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The above and other features, advantages, and aspects of the various embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. Throughout the drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and that the originals and elements are not necessarily drawn to scale.

[0034] Figure 1 A flow chart of a methanol engine protection method provided in this application;

[0035] Figure 2 A diagram illustrating the implementation process of a methanol engine protection method provided in this application;

[0036] Figure 3 A structural diagram of a methanol engine protection device provided in this application;

[0037] Figure 4 This is a structural diagram of an electronic control unit provided in this application. DETAILED DESCRIPTION

[0038] The following describes the embodiments of the present application in conjunction with the accompanying drawings. The terms used in the implementation methods of the present application are only used to explain the specific embodiments of the present application and are not intended to limit the present application.

[0039] The embodiments of the present application are described below in conjunction with the accompanying drawings. Those skilled in the art will appreciate that, with the development of technology and the emergence of new scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0040] 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 are not necessarily used to describe a specific order or sequential order. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances, and this is merely a way of distinguishing the objects of the same attributes when describing them in the embodiments of the present application. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, so that the process, method, system, product or equipment comprising a series of units need not be limited to those units, but may include other units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0041] During the development and testing of the methanol engine product, the inventor discovered that corrosion had occurred on the inner walls of the cylinder liners of multiple cylinders after disassembling the entire engine for testing. The inventor found that the cause of this corrosion was:

[0042] During the combustion process, methanol undergoes an oxidation reaction with oxygen to produce formaldehyde and water. Formaldehyde further reacts with oxygen to produce formic acid. Electrochemical corrosion refers to the corrosion of metals in electrolyte solutions. When impure metals come into contact with electrolyte solutions, a galvanic reaction occurs, in which the more active metal loses electrons and becomes oxidized. This corrosion process is called electrochemical corrosion. During electrochemical corrosion, certain areas of the metal surface are more susceptible to oxidation, becoming the anode, while areas that are less susceptible to oxidation are called the cathode. Oxidation occurs in the anode, releasing electrons; reduction occurs in the cathode, accepting electrons. This forms a closed circuit, known as an electrochemical reaction. The rate of electrochemical corrosion depends on many factors, including the properties of the metal itself, the nature of the electrolyte, temperature, and oxygen partial pressure. In electrochemical corrosion, the metal loses electrons and becomes oxidized, a process known as the anodic reaction. Substances in the medium gain electrons from the metal surface and become reduced, a process known as the cathodic reaction.

[0043] Electrolytes are substances that can ionize in aqueous solution or in a molten state to form charged ions. These ions can move freely, making the solution or melt conductive. Methanol, however, is a non-electrolyte. Because it exists in molecular form in water, it does not ionize into charged ions and is therefore non-conductive. Formic acid, on the other hand, can ionize into charged ions, including hydrogen ions and formate ions, in aqueous solution, making formic acid solutions conductive. Formic acid contained in methanol engine exhaust precipitates at temperatures below the dew point. Because the crankcase and cylinder are not completely sealed, formic acid condenses into the crankcase, which then accumulates on the piston rings, forming an electrolyte. Due to the electrode potential difference between the piston rings and the cylinder liner, and when the cylinder liner has a lower electrode potential (acting as the anode) and the piston ring has a higher electrode potential (acting as the cathode), this accelerates cylinder liner corrosion.

[0044] In order to solve the above problems, the embodiment of the present application provides a methanol engine protection method. The methanol engine protection method of the embodiment of the present application is described in detail below with reference to the accompanying drawings.

[0045] Reference Figure 1 , Figure 1 The process diagram of a methanol engine protection method provided in an embodiment of the present application is as follows: Figure 1 As shown, a methanol engine protection method provided by an embodiment of the present application may include steps 101 to 103, and these steps are described in detail below.

[0046] 101. Determine whether the methanol engine meets the crankcase cleaning conditions.

[0047] Specifically, as mentioned above, the primary cause of corrosion is that after a methanol engine is shut down, condensate containing formic acid accumulates on the piston rings in the crankcase, forming electrolytes that corrode the cylinder liners. Furthermore, during normal operation, the cylinders of a methanol engine are exposed to high temperatures and pressures, and the crankcase temperature is also relatively high, precluding the presence of electrolytes. Therefore, crankcase cleaning is primarily performed after the methanol engine is shut down. Therefore, the crankcase cleaning conditions may specifically include: upon receiving a shutdown command, the engine is shut down and the crankshaft continues to rotate. Upon receiving the shutdown command, the methanol rail of the methanol engine stops pumping methanol, causing the rail pressure to continuously decrease, the injectors to cease fuel injection, and the engine to shut down. Considering the subsequent need to drag the crankshaft for crankcase cleaning, and to reduce subsequent power battery consumption and avoid wasting energy by dragging the crankshaft from a stationary state, the crankcase cleaning condition includes the requirement that the crankshaft continues to rotate.

[0048] 102. When it is determined that the methanol engine meets the crankcase cleaning conditions, determine whether to clean the crankcase of the methanol engine based on the formic acid concentration and water content in the crankcase of the methanol engine.

[0049] Specifically, considering that a crankcase generally consists of an upper crankcase and a lower crankcase, with the upper crankcase integrally cast with the cylinder block and the lower crankcase used to store lubricating oil, a formic acid concentration sensor and a water content sensor can be installed on the upper crankcase to detect the formic acid concentration and water content in the crankcase ambient gas, respectively. A methanol engine will continue to emit exhaust gas before the crankshaft stops rotating. Because the crankcase and cylinder are not completely sealed, exhaust gas can enter the crankcase. The formic acid concentration and water content at this time are used to determine whether to clean the crankcase. The determination of whether to clean the crankcase can be made based on the comparison results of the current formic acid concentration with the formic acid concentration threshold, and the comparison results of the current water content with the water content threshold. The formic acid concentration sensor and the water content sensor are both corresponding gas sensors.

[0050] Considering that when the formic acid concentration is too high or the water content is too high, both may cause cylinder corrosion, it can be determined that the crankcase of the methanol engine is cleaned when the formic acid concentration is not less than the formic acid concentration threshold, or the water content is not less than the water content threshold.

[0051] The formic acid concentration threshold and water content threshold mentioned above are formic acid concentration threshold and water content threshold for suppressing the risk of electrochemical corrosion. The specific values may vary depending on the cylinder and piston ring materials, and the thresholds may also vary. Those skilled in the art can obtain the corresponding thresholds through experiments according to the circumstances, and will not be repeated here.

[0052] 103. When determining to clean the crankcase of the methanol engine, perform at least one cleaning process cycle until the formic acid concentration and water content in the crankcase meet the conditions for stopping the cleaning process. Each cleaning process cycle includes: using the power battery to drag the crankshaft of the methanol engine to operate according to the target cleaning intensity, and controlling the injector to inject dry gas into the cylinder according to the target injection intensity. The target cleaning intensity is: the cleaning intensity determined according to the current formic acid concentration and the current water content corresponding to the current cleaning process cycle, and the target injection intensity is the injection intensity determined according to the current formic acid concentration and the current water content.

[0053] Specifically, the target cleaning intensity can be the crankshaft speed, and the target injection intensity can be the flow rate of the dry gas ejected by the injector. To achieve the injection of moisture-free gas, an injection valve can be positioned between the injector and a gas tank containing the dry gas. The flow rate of the dry gas ejected by the injector can be controlled by controlling the opening of the injection valve. The dry gas herein can be a moisture-free gas, such as dry air, nitrogen, or other inert gases. The flow rate of the gas ejected by the injector can also be controlled by other methods, which are not limited here.

[0054] Among them, here, while the crankshaft is dragged to rotate to update the gas in the crankcase, dry gas is injected into the cylinder. This is mainly because although the cylinder and the crankcase are not sealed, when the gas in the cylinder flows, it will drive the flow of the gas in the crankcase, thereby enabling the renewal of the gas in the crankcase. However, due to the presence of other components between the crankcase and the cylinder, the flow of this gas is greatly restricted. Therefore, the method of relying solely on the rotation of the crankshaft to indirectly achieve the renewal of the gas in the crankcase is not only slow and requires more power from the power battery, but also the effect is not ideal. Therefore, here, a method of injecting water-free gas into the cylinder while the crankshaft is rotating is added to accelerate the renewal of the gas in the crankcase, so that the gas in the crankcase is updated more quickly.

[0055] During the cleaning process, the crankshaft speed and gas flow rate for the next cleaning process cycle can be determined based on the formic acid concentration and water content detected after the current cleaning process cycle. This process continues until the formic acid concentration and water content are both below the corresponding thresholds after a cleaning process cycle, indicating that the cylinder environment meets the requirements and electrolyte formation is prevented. The duration of each cleaning process cycle can be set to the same duration, for example, 3-5 seconds. Of course, the speed and gas flow rate can also be adjusted based on the formic acid concentration and water content detected in each cleaning process cycle, for example, gradually reducing the speed and gas flow rate as the concentration decreases. The power battery can power the engine starter, driving the starter, which in turn drives the crankshaft through the corresponding transmission device (such as a drive shaft). Those skilled in the art can adjust these settings as needed, and these are not limited here. The cleaning process cycle is terminated when the formic acid concentration is below the formic acid concentration threshold and the water content is below the water content threshold.

[0056] When the crankshaft is driven to rotate for cleaning, during the intake stroke, the piston moves downward from the top dead center, and the intake valve opens to allow air to enter the cylinder. During this process, the crankshaft rotates half a circle.

[0057] During the compression stroke, the piston moves upward from bottom dead center, closing both the intake and exhaust valves to compress the gas. At this point, the crankshaft rotates another half a revolution.

[0058] During the power stroke, the gas is no longer ignited and the piston moves downward. During this process, the crankshaft rotates another half a turn.

[0059] During the exhaust stroke, the piston moves upward from the bottom dead center, and at the same time the exhaust valve opens to discharge the gas from the exhaust tail pipe. The crankshaft rotates the last half circle to complete a complete working cycle.

[0060] As can be seen above, this methanol engine protection method effectively removes the source of electrolyte between the cylinder liner and piston ring by testing the formic acid concentration and water content in the crankcase of the methanol engine and combining it with a cleaning strategy of appropriate intensity, eliminating the potential risk of electrochemical corrosion. This solves the problem of electrochemical corrosion in the cylinder liner of the methanol engine and thereby improves the reliability of the entire engine.

[0061] In some embodiments, the target cleaning intensity includes the crankshaft speed, and the target injection intensity includes the gas flow rate. To further reduce the loss of power battery power and ensure the cleaning effect of formic acid and water in the cylinder, the crankshaft speed and the injected gas flow rate can be dynamically adjusted according to the detected formic acid concentration and the severity of the water content. The specific processing process may include the following:

[0062] The crankshaft rotation speed and the gas flow rate are determined based on the comparison result data between the current formic acid concentration and the formic acid concentration threshold, and the comparison result data between the current water content and the water content threshold.

[0063] For example, if the current formic acid concentration is not less than the formic acid concentration threshold, and the current water content is not less than the water content threshold, the crankshaft speed is the first speed, and the gas flow rate is the first flow rate. This indicates that both the formic acid and water content are relatively high, requiring rapid cleaning, which requires a higher crankshaft speed and a larger gas flow rate.

[0064] If the current formic acid concentration is not less than the formic acid concentration threshold and the current water content is less than the water content threshold, the crankshaft speed is set to a second speed, which is less than the first speed. The gas flow rate is set to a second flow rate, which is less than the first flow rate. Although the water content is low, the concentration of formic acid, the main component of the electrolyte, is high. Therefore, a higher crankshaft speed is still required, but the second speed is lower than the first speed, and the second flow rate is lower than the first flow rate.

[0065] If the current formic acid concentration is less than the formic acid concentration threshold and the current water content is not less than the water content threshold, the crankshaft speed is set to a third speed, which is less than the second speed. The gas flow rate is set to a third flow rate, which is less than the second flow rate. At this point, the formic acid content is no longer above the standard, but there is still a certain amount of excess water. To further reduce the possibility of electrochemical corrosion, the third speed and flow rate can be used for cleaning. The third speed is lower than the second speed, and the third flow rate is lower than the second flow rate.

[0066] When the formic acid concentration is lower than the formic acid concentration threshold and the water content is lower than the water content threshold, it indicates that the gas purity in the crankcase and the exhaust system meets the requirements, the corrosion risk is low, and the shutdown procedure can be entered.

[0067] It is understandable that those skilled in the art can adjust and select the crankshaft speed and gas flow rate required in the above situation as needed, which will not be elaborated here.

[0068] As a specific application of the above-mentioned methanol engine protection method, refer to Figure 2 As shown, taking a four-cylinder engine as an example, the protection method of the methanol engine may specifically include the following processing steps:

[0069] The working status of the methanol engine is monitored. When a stop command is received, methanol injection is stopped, the rail pressure is reduced, the injection valve cannot be opened, and the engine is automatically shut down.

[0070] Enter the exhaust status monitoring to detect the formic acid concentration and water content in the exhaust tail pipe.

[0071] If the formic acid concentration ω≥α and the water content ψ<β, medium-speed scavenging (≥600rpm) is performed and water-free gas is injected at a medium-intensity flow rate (≥20mg / st). That is, the power battery drives the flywheel, which drives the engine's crank-connecting rod mechanism to rotate, and the piston reciprocates to enter the exhaust working cycle. At the same time, the injection valve is controlled to make the injector spray dry gas to achieve the purpose of purging the formic acid gas in the crankcase and exhaust system. During the scavenging process, the formic acid concentration sensor and the water content sensor dynamically detect the formic acid concentration ω and water content ψ of the crankcase gas. If the detection value exceeds the range of ω≥α and ψ<β, the next cleaning process cycle is entered.

[0072] If the formic acid concentration ω ≥ α and the water content ψ ≥ β, due to the heavy gas cleaning task, high-speed scavenging (≥ 800 rpm) is required while injecting water-free gas (≥ 30 mg / st) at a high-intensity flow rate to achieve the purpose of cleaning the formic acid gas in the crankcase and exhaust system. During the scavenging process, the formic acid concentration sensor and the water content sensor dynamically detect the formic acid concentration ω and water content ψ of the crankcase gas. When the detection value exceeds the range of ω ≥ α and ψ ≥ β, the next cleaning process cycle is entered.

[0073] If the formic acid concentration ω is less than α, the water content ψ is less than β, the gas purity of the crankcase and exhaust system meets the requirements, and the corrosion risk is low, the shutdown procedure can be started;

[0074] If the formic acid concentration ω is less than α and the water content ψ is greater than or equal to β, the gas scavenging task is relatively light, so low-speed scavenging (≥400 rpm) is required while injecting water-free gas at a low flow rate (≥10 mg / st). During the scavenging process, the formic acid concentration sensor and the water content sensor dynamically detect the formic acid concentration ω and water content ψ of the crankcase gas. If the detection value exceeds the range of ω less than α and ψ greater than or equal to β, the next operation logic is entered.

[0075] Among them, α is the formic acid concentration threshold, and β is the moisture content threshold.

[0076] The above describes a methanol engine protection method provided by an embodiment of the present application. The following describes a device for executing the above methanol engine protection method.

[0077] See also Figure 3 , Figure 3 This is a schematic diagram of the structure of a methanol engine protection device provided in an embodiment of the present application. Figure 3 As shown, the protection device of the methanol engine includes:

[0078] The cleaning condition judgment module 301 is used to determine whether the methanol engine meets the crankcase cleaning conditions.

[0079] The cleaning start determination module 302 is used to determine whether to clean the crankcase of the methanol engine according to the formic acid concentration and water content in the crankcase of the methanol engine when the cleaning condition judgment module determines that the methanol engine meets the crankcase cleaning conditions. And,

[0080] The crankcase cleaning execution module 303 is used to execute at least one cleaning process cycle until the formic acid concentration and water content in the crankcase meet the conditions for stopping the cleaning process when the cleaning start determination module determines that the crankcase of the methanol engine is to be cleaned. Each cleaning process cycle includes: driving the crankshaft of the methanol engine to operate according to the target cleaning intensity through the power battery, and controlling the injector to inject dry gas into the cylinder according to the target injection intensity. The target cleaning intensity is: the cleaning intensity determined according to the current formic acid concentration and current water content corresponding to the current cleaning process cycle, and the target injection intensity is the injection intensity determined according to the current formic acid concentration and current water content.

[0081] In one possible implementation, the target cleaning intensity includes the crankshaft speed, and the target injection intensity includes the gas flow rate. The process of determining the target cleaning intensity and the target injection intensity in the crankcase cleaning execution module 303 includes:

[0082] The crankshaft rotation speed and the gas flow rate are determined based on the comparison result data between the current formic acid concentration and the formic acid concentration threshold, and the comparison result data between the current water content and the water content threshold.

[0083] In one possible implementation, the crankcase cleaning execution module 303 determines the crankshaft speed and gas flow rate based on the comparison result data of the current formic acid concentration and the formic acid concentration threshold, and the comparison result data of the current water content and the water content threshold, including:

[0084] If the current formic acid concentration is not less than the formic acid concentration threshold, and the current water content is not less than the water content threshold, the rotation speed of the crankshaft is the first rotation speed, and the gas flow rate is the first flow rate.

[0085] In one possible implementation, the process of the crankcase cleaning execution module 303 determining the crankshaft speed and gas flow rate based on the comparison result data of the current formic acid concentration and the formic acid concentration threshold, and the comparison result data of the current water content and the water content threshold, further includes:

[0086] If the current formic acid concentration is not less than the formic acid concentration threshold and the current water content is less than the water content threshold, the crankshaft speed is the second speed and the gas flow rate is the second flow rate. The second speed is less than the first speed and the second flow rate is less than the first flow rate.

[0087] In one possible implementation, the process of the crankcase cleaning execution module 303 determining the crankshaft speed and gas flow rate based on the comparison result data of the current formic acid concentration and the formic acid concentration threshold, and the comparison result data of the current water content and the water content threshold, further includes:

[0088] If the current formic acid concentration is less than the formic acid concentration threshold and the current water content is not less than the water content threshold, the crankshaft speed is a third speed, the gas flow rate is a third flow rate, the third speed is less than the second speed, and the third flow rate is less than the second flow rate.

[0089] In one possible implementation, the process of the cleaning start determination module 302 determining whether to perform cleaning on the crankcase of the methanol engine according to the formic acid concentration and the water content in the crankcase of the methanol engine includes:

[0090] If the formic acid concentration is not less than the formic acid concentration threshold, or the water content is not less than the water content threshold, it is determined that the crankcase of the methanol engine is to be cleaned.

[0091] In one possible implementation, the cleaning stop processing condition in the cleaning start determination module 302 includes:

[0092] The formic acid concentration is less than the formic acid concentration threshold, and the water content is less than the water content threshold.

[0093] In one possible implementation, the process of the cleaning condition determination module 301 determining whether the methanol engine meets the crankcase cleaning condition includes:

[0094] If the engine is shut down and the crankshaft does not stop rotating after receiving the stop command, it is determined that the methanol engine meets the crankcase cleaning conditions.

[0095] refer to Figure 4 As shown, an embodiment of the present application also provides an electronic control unit, including at least one processor 401 and a memory 402 connected to the processor 401, wherein: the memory is used to store computer programs; the processor 401 is used to execute computer programs so that the electronic control unit can implement the methanol engine protection method described in the above embodiment.

[0096] An embodiment of the present application also provides a computer program product including computer-readable instructions. When the computer-readable instructions are executed on an electronic device, the electronic device implements the methanol engine protection method provided in the embodiment of the present application.

[0097] A computer-readable storage medium is also provided in an embodiment of the present application. The storage medium carries one or more computer programs. When the one or more computer programs are executed by an electronic device, the electronic device can implement any methanol engine protection method provided in an embodiment of the present application.

[0098] An embodiment of the present application further provides a vehicle, comprising: an electronic control unit as described in the above embodiment.

[0099] It should also be noted that the device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed across multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment. In addition, in the drawings of the device embodiments provided in this application, the connection relationship between the modules indicates that there is a communication connection between them, which can be specifically implemented as one or more communication buses or signal lines.

[0100] Through the description of the above embodiments, those skilled in the art can clearly understand that the present application can be implemented by means of software plus necessary general hardware, and of course can also be implemented by special hardware including application-specific integrated circuits, special CPUs, special memories, special components, etc. In general, all functions performed by computer programs can be easily implemented with corresponding hardware, and the specific hardware structures used to implement the same function can also be diverse, such as analog circuits, digital circuits or special circuits, etc. However, for the present application, software program implementation is a better implementation method in most cases. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a readable storage medium, such as a computer's floppy disk, USB flash drive, mobile hard disk, ROM, RAM, magnetic disk or optical disk, etc., and includes a number of instructions to enable a computer device (which can be a personal computer, training equipment, or network equipment, etc.) to execute the methods described in each embodiment of the present application.

[0101] In the above embodiments, all or part of the embodiments may be implemented by software, hardware, firmware, or any combination thereof. When implemented by software, all or part of the embodiments may be implemented in the form of a computer program product.

[0102] The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from a website, a computer, a training device or a data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website, a computer, a training device or a data center. The computer-readable storage medium can be any available medium that a computer can store or a data storage device such as a training device, a data center, etc. that includes one or more available media integrations. The available medium can be a magnetic medium, (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid-state drive (SSD)).

Claims

1. A methanol engine protection method, characterized in that: include: determining whether the methanol engine meets crankcase cleaning conditions; When it is determined that the methanol engine meets the crankcase cleaning condition, determining whether to clean the crankcase of the methanol engine according to the formic acid concentration and water content in the crankcase of the methanol engine; When determining to perform a cleaning process on the crankcase of the methanol engine, at least one cleaning process cycle is performed until the formic acid concentration and the water content in the crankcase meet the conditions for stopping the cleaning process. Each cleaning process cycle includes: driving the crankshaft of the methanol engine to operate according to a target cleaning intensity through a power battery, and controlling the injector to inject dry gas into the cylinder according to a target injection intensity. The target cleaning intensity is: a cleaning intensity determined based on the current formic acid concentration and the current water content corresponding to the current cleaning process cycle, and the target injection intensity is an injection intensity determined based on the current formic acid concentration and the current water content.

2. The methanol engine protection method according to claim 1, characterized in that: The target scavenging intensity includes the rotational speed of the crankshaft, and the target injection intensity includes the gas flow rate. The process of determining the target scavenging intensity and the target injection intensity includes: The rotational speed of the crankshaft and the gas flow rate are determined based on the comparison result data between the current formic acid concentration and the formic acid concentration threshold, and the comparison result data between the current water content and the water content threshold.

3. The methanol engine protection method according to claim 2, characterized in that: The determining of the crankshaft speed and the gas flow rate based on the comparison result data between the current formic acid concentration and the formic acid concentration threshold, and the comparison result data between the current water content and the water content threshold, includes: If the current formic acid concentration is not less than the formic acid concentration threshold, and the current water content is not less than the water content threshold, the rotational speed of the crankshaft is a first rotational speed, and the gas flow rate is a first flow rate.

4. The methanol engine protection method according to claim 3, characterized in that: The determining of the crankshaft speed and the gas flow rate based on the comparison result data between the current formic acid concentration and the formic acid concentration threshold, and the comparison result data between the current water content and the water content threshold, further includes: If the current formic acid concentration is not less than the formic acid concentration threshold, and the current water content is less than the water content threshold, the crankshaft speed is a second speed, the gas flow rate is a second flow rate, the second speed is less than the first speed, and the second flow rate is less than the first flow rate.

5. The methanol engine protection method according to claim 4, characterized in that: The determining of the crankshaft speed and the gas flow rate based on the comparison result data between the current formic acid concentration and the formic acid concentration threshold, and the comparison result data between the current water content and the water content threshold, further includes: If the current formic acid concentration is less than the formic acid concentration threshold and the current water content is not less than the water content threshold, the crankshaft speed is a third speed, the gas flow rate is a third flow rate, the third speed is less than the second speed, and the third flow rate is less than the second flow rate.

6. The methanol engine protection method according to any one of claims 3 to 5, characterized in that: The step of determining whether to clean the crankcase of the methanol engine according to the formic acid concentration and the water content in the crankcase of the methanol engine comprises: If the formic acid concentration is not less than the formic acid concentration threshold, or the water content is not less than the water content threshold, it is determined that the crankcase of the methanol engine needs to be cleaned.

7. The methanol engine protection method according to claim 3, characterized in that: The stopping cleaning process conditions include: The formic acid concentration is less than the formic acid concentration threshold, and the water content is less than the water content threshold.

8. The methanol engine protection method according to claim 1, characterized in that: Determining whether the methanol engine meets the crankcase cleaning condition includes: If the engine is shut down and the crankshaft does not stop rotating after receiving the stop command, it is determined that the methanol engine meets the crankcase cleaning condition.

9. An electronic control unit, characterized in that: comprising at least one processor and a memory connected to the processor, wherein: The memory is used to store computer programs; The processor is configured to execute the computer program so as to enable the electronic control unit to implement the methanol engine protection method according to any one of claims 1 to 8.

10. A vehicle, characterized in that: include: The electronic control unit as claimed in claim 9.

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