Temperature control method and equipment for glow plug of compression ignition type methanol engine

Abstract

The invention discloses a temperature control method and equipment for a glow plug of a compression ignition type methanol engine, and relates to the field of methanol engines, and the method comprises the following steps: in a standard environment, calibrating a temperature control MAP by testing the relationship between the heat efficiency and nitrogen oxide emission of each working condition point at different heating temperatures; corresponding water temperature correction models, environment pressure correction models and environment temperature correction models are established according to historical establishment targets for special working conditions of cold start, low environment pressure and high environment temperature. The basic temperature is indexed from the temperature control MAP according to the current development target, and three heating temperature correction values and corresponding coefficients based on the water temperature, the environment pressure and the environment temperature are respectively calculated by using the three models, so that the optimal heating temperature of the heating plug is calculated. According to the method, the optimal heating temperature of the heating plug is determined through multi-dimensional calibration and real-time correction, accurate control over the compression ignition type methanol engine under various working conditions is achieved, and then the combustion heat efficiency and stability of the engine are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of methanol engines, in particular to a glow plug temperature control method and device for compression ignition methanol engine. BACKGROUND

[0002] Under the current development trend of engine technology, methanol, as a clean, low-carbon and widely available fuel, has shown great application potential in the field of large-bore engines, such as ships, power generation and heavy transportation industries. Methanol has a high oxygen content, which can theoretically significantly reduce harmful gas emissions, and it can be produced from coal, natural gas, biomass and other raw materials, effectively easing the supply pressure of traditional fossil fuels.

[0003] However, methanol faces many challenges in engine applications. Its self-ignition temperature is as high as 723K, much higher than that of diesel fuel (523K), making it difficult to meet the self-ignition conditions in the normal compression process of the engine. At the same time, the high latent heat of vaporization of methanol (1100kJ / kg) causes it to absorb a large amount of heat when vaporizing, especially in low-temperature environments, which can cause a sharp drop in cylinder temperature, making it difficult for the mixture to reach the self-ignition threshold, resulting in cold start difficulties. In addition, under different operating conditions, such as high-altitude starting, engine low-load and high-load operation, how to achieve stable in-cylinder combustion and reduce hydrocarbon emissions is also a problem that needs to be solved.

[0004] Traditional glow plugs have obvious shortcomings in the application of methanol engines. They cannot accurately adjust the in-cylinder heating temperature according to the actual operating conditions of the engine, such as engine water temperature, intake air temperature, ambient pressure, fuel injection amount and speed, etc., making it difficult to ensure that the methanol engine can achieve efficient and stable combustion under various operating conditions. SUMMARY

[0005] The purpose of the present application is to provide a glow plug temperature control method and device for compression ignition methanol engine, which can determine the optimal heating temperature of the glow plug through multi-dimensional calibration and real-time correction, achieve precise control of the compression ignition methanol engine under various operating conditions, and thus improve the thermal efficiency and stability of engine combustion.

[0006] To achieve the above-mentioned purpose, the present application provides the following solutions:

[0007] In a first aspect, the application provides a glow plug temperature control method for a compression ignition methanol engine, which is applied to a glow plug control module, the glow plug control module being connected with an engine controller, and the control method comprising: constructing a basic control MAP; the basic control MAP being a two-dimensional chart composed of multiple working points, with the engine speed as the X-axis and the engine oil volume per stroke as the Y-axis; in a standard environment, based on the basic control MAP, fitting a relationship curve between the engine thermal efficiency and the nitrogen oxide emission corresponding to each working point of the glow plug at different heating temperatures, calibrating the glow plug heating temperature at different combinations of the engine thermal efficiency and the nitrogen oxide emission for each working point, and constructing a temperature control MAP; the glow plug being a glow plug for the compression ignition methanol engine; in a cold start environment, constructing a water temperature correction model based on the engine historical development target and the basic control MAP; in a low environmental pressure environment, constructing an environmental pressure correction model based on the engine historical development target and the basic control MAP; in a high environmental temperature environment, constructing an environmental temperature correction model based on the engine historical development target and the basic control MAP; based on the current development target of the engine, indexing the glow plug heating temperature corresponding to the current development target in the temperature control MAP as a basic glow plug heating temperature; according to the current development target of the engine, using the water temperature correction model, the environmental pressure correction model and the environmental temperature correction model to respectively obtain a first correction value and a water temperature correction coefficient, a second correction value and an environmental pressure correction coefficient, and a third correction value and an environmental temperature correction coefficient of the glow plug heating temperature, and constructing a correction data set; and calculating the optimal glow plug heating temperature for the current development target of the engine by using the basic glow plug heating temperature and the correction data set.

[0008] In a second aspect, the application provides a computer device, comprising: a memory, a processor to store a computer program on the memory and run the computer program on the processor, and the processor executes the computer program to implement the glow plug temperature control method for the compression ignition methanol engine described above.

[0009] According to the specific embodiments provided in the application, the following technical effects are disclosed:

[0010] The application constructs a basic control MAP; in a standard environment, tests the thermal efficiency and nitrogen oxide emission relationship of each working point under different heating temperatures, and calibrates the temperature control MAP. For special working conditions of cold start, low ambient pressure and high ambient temperature, the corresponding water temperature, ambient pressure and ambient temperature correction models are constructed according to the history. According to the current development target, the basic temperature is indexed from the temperature control MAP, and three models are used to calculate three heating temperature correction values and corresponding coefficients based on water temperature, ambient pressure and ambient temperature, so as to calculate the optimal heating temperature of the heating plug. The application determines the optimal heating temperature of the heating plug through multi-dimensional calibration and real-time correction, realizes the precise control of the compression ignition methanol engine under various working conditions, and improves the thermal efficiency and stability of the engine combustion. BRIEF DESCRIPTION OF DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0012] Figure 1 A flowchart of a compression ignition methanol engine glow plug temperature control method provided by an embodiment of the present application Figure 1 .

[0013] Figure 2 A flowchart of a compression ignition methanol engine glow plug temperature control method provided by an embodiment of the present application Figure 2 .

[0014] Figure 3 An electrical connection relationship diagram of a glow plug controller and an engine controller provided by an embodiment of the present application.

[0015] Figure 4 A structural diagram of a computer device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0017] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0018] Embodiment 1, as shown in the embodiment, provides a glow plug temperature control method for a compression ignition methanol engine, the glow plug temperature control method is applied to a glow plug control module, the glow plug control module is connected with an engine controller, and the control method comprises the following steps: Figures 1-3 S2. In a standard environment, based on a basic control MAP, a relationship curve of engine thermal efficiency and nitrogen oxide emission corresponding to each working condition point of the glow plug at different heating temperatures is fitted, a heating temperature of the glow plug at different combinations of engine thermal efficiency and nitrogen oxide emission of each working condition point is calibrated, and a temperature control MAP is constructed; the glow plug is a glow plug of a compression ignition methanol engine.

[0019] Further, the standard environment is that the water temperature is 25 DEG C, the environmental pressure is 101 kPa, and the environmental temperature is 25 DEG C.

[0020] Optionally, the fitting method of the relationship curve of engine thermal efficiency and nitrogen oxide emission corresponding to each working condition point at different heating temperatures is a difference method fitting.

[0021] In actual application, the basic control MAP is a two-dimensional chart, the X axis is the engine speed, the value of the X axis can be set to from 0 rpm to the maximum allowable speed of the engine, the Y axis is the engine oil per stroke cycle mg / str, which can be set to from 0 mg / str to the maximum engine oil per stroke cycle. Among them, the oil per stroke cycle is positively correlated with the output torque of the engine, and the greater the oil per stroke cycle, the greater the output torque.

[0022] The basic MAP calibration method of temperature control: in a standard environment, first, for the fixed speed and fixed cycle oil points in the MAP, different glow plug heating temperatures can be adjusted at this fixed working condition point, the change of engine thermal efficiency and the change of nitrogen oxide emission are recorded, the relationship curve of different glow plug heating temperatures and engine thermal efficiency and nitrogen oxide emission is obtained, and the glow plug heating temperature value meeting the development target is selected according to the curve and the engine development target. Repeat the same test by selecting different working condition points to obtain the required heating temperature value of the glow plug at multiple working condition points in the MAP, and finally the numerical value of the vehicle MAP chart is fitted by using the difference method.

[0023] S3. In a cold start environment, a water temperature correction model is constructed based on the engine historical development target and the basic control MAP.

[0024] Further, the cold start environment is that the water temperature is less than 5 DEG C, the environmental pressure is 101 kPa, and the environmental temperature is 25 DEG C.

[0025]

[0026] ​Further, step S3 specifically comprises:

[0027] S31. Under a cold start environment, based on the basic control MAP, fitting the engine start time and the engine idle speed stability after starting corresponding to each working point of the heating plug at different water temperatures, calibrating the first correction value of the heating temperature of the heating plug at different water temperatures of each working point to obtain a basic water temperature correction MAP; the basic water temperature correction MAP is a two-dimensional chart composed of multiple working points with the engine speed as the X-axis and the engine oil per stroke as the Y-axis under a cold start environment.

[0028] S32. Using the engine historical development target to calculate the water temperature correction coefficient of each working point in the basic water temperature correction MAP at different water temperatures to establish a water temperature correction coefficient table.

[0029] S33. Based on the basic water temperature correction MAP and the water temperature correction coefficient table, a water temperature correction model is constructed.

[0030] In actual application, water temperature correction is divided into two parts, which are water temperature correction basic MAP and water temperature correction coefficient table. Engine water temperature correction calibration method: the calibration of water temperature correction mainly considers the cold start of the engine, sets different heating temperatures of the heating plug under different environmental temperatures, obtains the relationship between the heating temperature and the engine start time and the combustion stability after the engine enters idle speed, and fills in the appropriate heating temperature value of the electric heating plug according to the development target.

[0031] S4. Under a low environmental pressure environment, an environmental pressure correction model is constructed based on the engine historical development target and the basic control MAP.

[0032] Further, the low environmental pressure environment is: water temperature 25℃; environmental pressure less than 80kPa; environmental temperature 25℃.

[0033] Further, step S4 specifically comprises:

[0034] S41. Under a low environmental pressure environment, based on the basic control MAP, fitting the engine start time and the engine combustion stability corresponding to each working point of the heating plug at different environmental pressures, calibrating the second correction value of the heating temperature of the heating plug at different environmental pressures of each working point to obtain a basic environmental pressure correction MAP; the basic environmental pressure correction MAP is a two-dimensional chart composed of multiple working points with the engine speed as the X-axis and the engine oil per stroke as the Y-axis under a low environmental pressure environment.

[0035] S42. Using the engine historical development target to calculate the environmental pressure correction coefficient of each working point in the basic environmental pressure correction MAP at different environmental pressures to establish an environmental pressure correction coefficient table.

[0036] S43. Based on the basic ambient pressure correction MAP and the ambient pressure correction coefficient table, an ambient pressure correction model is constructed.

[0037] In actual application, the ambient pressure correction is divided into two parts, which are ambient pressure correction basic MAP and ambient pressure correction coefficient table. Ambient pressure correction calibration method: Ambient pressure correction mainly considers the engine combustion stability and the amount of nitrogen oxide emissions in high altitude area. The calibration mainly considers the engine in high altitude area (ambient pressure below 80kPa), and the relationship between heating temperature and engine starting time and combustion stability is obtained by controlling different heating temperatures at different ambient pressures. According to the development target, the appropriate value is filled in.

[0038] S5. Under high ambient temperature environment, an ambient temperature correction model is constructed based on the engine historical development target and the basic control MAP.

[0039] Further, the high ambient temperature environment is: water temperature 25℃; ambient pressure 101kPa; ambient temperature greater than 35℃.

[0040] Further, step S5 specifically includes:

[0041] S51. Under high ambient temperature environment, based on the basic control MAP, the relationship between the exhaust temperature of the engine and the nitrogen oxide emission of the engine corresponding to each working condition point of the glow plug under different ambient temperature environments is fitted, the third correction value of the glow plug heating temperature of each working condition point under different ambient temperature is calibrated, and the basic ambient temperature correction MAP is obtained; the basic ambient temperature correction MAP is a two-dimensional chart composed of multiple working condition points, with engine speed as X axis and engine per stroke cycle oil volume as Y axis.

[0042] S52. The ambient temperature correction coefficient of each working condition point in the basic ambient temperature correction MAP under different ambient temperature is calculated by using the engine historical development target, and an ambient temperature correction coefficient table is established.

[0043] S53. Based on the basic ambient temperature correction MAP and the ambient temperature correction coefficient table, an ambient temperature correction model is constructed.

[0044] In actual application, the ambient temperature correction is divided into two parts, which are ambient temperature correction basic MAP and ambient temperature correction coefficient table. Ambient temperature correction control basic MAP calibration: mainly considers the influence of high ambient temperature on engine overheating and high nitrogen oxide emission. By controlling different heating temperatures at different ambient temperatures, the relationship between heating temperature and engine exhaust temperature and exhaust nitrogen oxide is obtained, and the appropriate value is filled according to the development target.

[0045] S6. Based on the current development target of the engine, index the heating plug heating temperature corresponding to the current development target in the temperature control MAP as the basic heating plug heating temperature.

[0046] S7. According to the current development target of the engine, use the water temperature correction model, the ambient pressure correction model and the ambient temperature correction model to obtain the first correction value of the heating plug heating temperature and the water temperature correction coefficient, the second correction value and the ambient pressure correction coefficient, and the third correction value and the ambient temperature correction coefficient, respectively, to construct a correction data set.

[0047] S8. The optimal heating plug heating temperature of the current development target of the engine is calculated using the correction data set. Further, the calculation formula of the optimal heating plug heating temperature is as follows:

[0048] T = T0 + T1 x q1 + T2 x q2 + T3 x q3.

[0049] In the formula, T is the optimal heating plug heating temperature; T0 is the basic heating plug heating temperature; T1 is the first correction value; T2 is the second correction value; T3 is the third correction value; q1 is the water temperature correction coefficient; q2 is the ambient pressure correction coefficient; q3 is the ambient temperature correction coefficient.

[0050] Optionally, the electric heating plug of the present application has a control system, i.e. an electric heating plug controller, which communicates with the (methanol) engine controller through J1939 protocol, and the two controllers are completely decoupled. After receiving the required electric heating plug heating temperature value calculated by the methanol engine controller, the electric heating plug controller controls the electric heating plug heating.

[0051] In actual application, before temperature control, the electric heating plug needs to be controlled first, as follows:

[0052] 1) The key is powered on, the electric heating plug is fault-free, and the preheating is turned on.

[0053] 2) Within 30s after the key is powered on, if the key is not detected to be in the start gear, the preheating is turned off; (the driver has no intention to start, to avoid energy waste).

[0054] 3) Within 30s after the key is detected to be in the start gear, if the engine is not detected to be in the idle mode, the preheating is turned off; (the engine fails to start, to avoid energy waste).

[0055] 4) Within 30s after the key is detected to be in the start gear, if the engine is detected to be in the idle mode or the normal mode, the preheating is turned on.

[0056] 5) When the engine is detected to be in the stop mode, the heating is turned off.

[0057] 6) Detecting that the key switch is off, heating is off.

[0058] 7) Detecting that the glow plug fails, heating is off.

[0059] The technical effects of the present application are as follows:

[0060] The present application determines the optimal heating temperature of the glow plug through multi-dimensional calibration and real-time correction, realizes the precise control of the compression ignition methanol engine under various working conditions, and further improves the thermal efficiency and stability of engine combustion. Specifically, the present application has the following advantages:

[0061] 1. Excellent cold start performance: By precisely controlling the heating temperature of the glow plug during cold start, the temperature of the cylinder mixture can be quickly raised, effectively overcoming the problems of high self-ignition temperature and high latent heat of vaporization of methanol fuel, so that the pure methanol engine can also start easily in low temperature environment, greatly improving the cold start reliability and convenience of the engine.

[0062] 2. Stable normal temperature combustion: Under normal temperature conditions, the controllable glow plug of the present application can automatically adjust the heating temperature according to the real-time operating parameters of the engine, ensuring that the cylinder mixture is always in the best combustion state, significantly enhancing the stability of combustion, reducing combustion fluctuations, making the engine run more smoothly, and reducing the vibration and noise of the engine.

[0063] 3. Significantly reduce hydrocarbon emissions: Under low load operating conditions, by reasonably controlling the temperature of the glow plug, the combustion conditions of the mixture are improved, and the further combustion of incomplete combustion hydrocarbons is promoted, thereby greatly reducing hydrocarbon emissions, making the engine more environmentally friendly, meeting the increasingly stringent emission standards, and helping to reduce air pollution and protect the environment.

[0064] Therefore, this glow plug control technology that can precisely control temperature and adapt to various working conditions is of great significance for promoting the development of compression ignition direct injection methanol engines, especially in the field of small displacement engines.

[0065] In embodiment 2, the present application also provides a computer device, which can be a server or a terminal, and its internal structure diagram can be as shown in Figure 4As shown, this computer device includes a processor, memory, input / output interfaces (I / O), and a communication interface. The processor, memory, and I / O interfaces are connected via a system bus, and the communication interface is also connected to the system bus via the I / O interfaces. The processor provides computational and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The database stores and processes data. The I / O interfaces are used for exchanging information between the processor and external devices. The communication interface is used for communicating with external terminals via a network connection. When the computer program is executed by the processor, it implements the methods described above.

[0066] Those skilled in the art will understand that Figure 4 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0067] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer readable storage medium, and when the computer program is executed, the processes of the above-mentioned embodiments of the methods can be included. Any reference to memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical storage, high-density embedded non-volatile memory, resistive memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration but not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc.

[0068] Any combination of the technical features of the above embodiments can be made. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combination of the technical features does not exist, it should be considered as the scope of the present application.

[0069] The principles and implementation modes of the present application are described by using specific examples. The above description of the embodiments is only used to help understand the method and its core idea; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed. In conclusion, the content of the present application should not be understood as a limitation.

Claims

1. A method for controlling the temperature of a glow plug in a compression ignition methanol engine, characterized in that, The compression ignition methanol engine glow plug temperature control method is applied to a glow plug control module, which is connected to the engine controller. The control method includes: Construct a basic control MAP; the basic control MAP is a two-dimensional chart consisting of multiple operating points with engine speed as the X-axis and engine oil volume per stroke as the Y-axis. In a standard environment, based on the basic control MAP, the relationship curves between engine thermal efficiency and nitrogen oxide emissions for each operating point at different heating temperatures of the glow plug are fitted, the heating temperature of the glow plug at each operating point under different combinations of engine thermal efficiency and nitrogen oxide emissions are calibrated, and a temperature control MAP is constructed; the glow plug is a compression ignition methanol engine glow plug. In a cold start environment, a water temperature correction model is constructed based on the engine's historical development goals and the basic control MAP. Under low environmental pressure, an environmental pressure correction model is constructed based on the engine's historical development goals and the basic control MAP. In high ambient temperature environments, an ambient temperature correction model is constructed based on the engine's historical development goals and the basic control MAP. Based on the current development goals of the engine, the heating temperature of the heat plug corresponding to the current development goals in the index temperature control MAP is used as the base heating temperature of the heat plug. Based on the current engine development goals, using the water temperature correction model, environmental pressure correction model, and environmental temperature correction model, the first correction value and water temperature correction coefficient, the second correction value and environmental pressure correction coefficient, and the third correction value and environmental temperature correction coefficient of the heating plug heating temperature are obtained respectively, and a correction dataset is constructed. The optimal heating temperature for the engine's current development goals was calculated using the base heating temperature and the corrected dataset.

2. The method for controlling the temperature of the glow plug in a compression ignition methanol engine according to claim 1, characterized in that, In a cold start environment, a water temperature correction model is constructed based on the engine's historical development goals and the basic control MAP, specifically including: In a cold start environment, based on the basic control MAP, the engine start time and engine idle stability at each operating point of the heated plug at different water temperatures are fitted, and the first correction value of the heated plug heating temperature at each operating point at different water temperatures is calibrated to obtain the basic water temperature correction MAP. Using the engine's historical development goals, calculate the water temperature correction coefficients for each operating point in the base water temperature correction MAP at different water temperatures, and establish a water temperature correction coefficient table. A water temperature correction model is constructed based on the basic water temperature correction MAP and the water temperature correction coefficient table.

3. The method for controlling the temperature of a glow plug in a compression-ignition methanol engine according to claim 1, characterized in that, Under low environmental pressure, an environmental pressure correction model is constructed based on the engine's historical development goals and the basic control MAP, specifically including: Under low ambient pressure, based on the basic control MAP, the engine start time and combustion stability of the engine corresponding to each operating point of the heated plug under different ambient pressures are fitted, and the second correction value of the heated plug heating temperature under different ambient pressures at each operating point is calibrated to obtain the basic ambient pressure correction MAP. Using the historical development goals of the engine, calculate the environmental pressure correction coefficients for each operating point in the basic environmental pressure correction MAP under different environmental pressures, and establish an environmental pressure correction coefficient table. An environmental pressure correction model is constructed based on the basic environmental pressure correction MAP and the environmental pressure correction coefficient table.

4. The method for controlling the temperature of the glow plug in a compression ignition methanol engine according to claim 1, characterized in that, In high ambient temperature environments, an ambient temperature correction model is constructed based on the engine's historical development goals and the basic control MAP, specifically including: In high ambient temperature environments, based on the basic control MAP, the relationship between the engine exhaust temperature and the engine nitrogen oxide emissions corresponding to each operating point of the heated plug under different ambient temperature environments is fitted, and the third correction value of the heated plug heating temperature at each operating point under different ambient temperatures is calibrated to obtain the basic ambient temperature correction MAP; the basic ambient temperature correction MAP is a two-dimensional chart composed of multiple operating points with the engine speed as the X-axis and the engine oil volume per stroke as the Y-axis under high ambient temperature environments. Using the engine's historical development goals, calculate the ambient temperature correction coefficients for each operating point in the basic ambient temperature correction MAP under different ambient temperatures, and establish an ambient temperature correction coefficient table. An environmental temperature correction model is constructed based on the basic environmental temperature correction MAP and the environmental temperature correction coefficient table.

5. The method for controlling the temperature of a glow plug in a compression-ignition methanol engine according to claim 1, characterized in that, The formula for calculating the optimal heating temperature of the heating plug is as follows: T=T0+T1×q1+T2×q2+T3×q3; In the formula, T is the optimal heating plug temperature; T0 is the basic heating plug temperature; T1 is the first correction value; T2 is the second correction value; T3 is the third correction value; q1 is the water temperature correction coefficient; q2 is the ambient pressure correction coefficient; and q3 is the ambient temperature correction coefficient.

6. The method for controlling the temperature of a glow plug in a compression-ignition methanol engine according to claim 1, characterized in that, The standard environment is as follows: water temperature 25℃; ambient pressure 101kPa; ambient temperature 25℃.

7. The method for controlling the temperature of a glow plug in a compression-ignition methanol engine according to claim 1, characterized in that, The cold start environment is as follows: water temperature less than 5℃; ambient pressure 101kPa; ambient temperature 25℃.

8. The method for controlling the temperature of a glow plug in a compression-ignition methanol engine according to claim 1, characterized in that, The low environmental pressure environment is defined as follows: water temperature 25℃; environmental pressure less than 80kPa; and environmental temperature 25℃.

9. The method for controlling the temperature of a glow plug in a compression-ignition methanol engine according to claim 1, characterized in that, The high ambient temperature environment is defined as follows: water temperature 25℃; ambient pressure 101kPa; ambient temperature greater than 35℃.

10. A computer device, comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that the processor executes the computer program to implement the glow plug temperature control method for a compression ignition methanol engine according to any one of claims 1-9.

Images