Inlet air heating method for cold start of methanol engine

Abstract

The invention discloses an air inlet heating method for cold start of a methanol engine. The air inlet heating method comprises the following steps: 1, providing an air inlet heating system for cold start of the methanol engine; 2, inputting a related preset threshold value through a controller; thirdly, parameters of the methanol engine are monitored in real time through the sensor assembly; fourthly, the controller conducts system regulation and control according to the parameters of the methanol engine; only air entering the engine is heated in a targeted mode, a large amount of electric energy does not need to be consumed to heat the cylinder body large in size and high in heat capacity, and energy consumption is greatly reduced. Meanwhile, the mounting base and the second connecting plate are made of insulation materials, heat loss is reduced, the energy utilization efficiency is further improved, the electricity shortage risk of a vehicle storage battery is avoided, the energy saving advantage of the methanol engine is highly matched, in addition, the cost is low, replacement is easy, and the later maintenance cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of ship methanol engine driving, in particular to an air intake heating method for cold start of a methanol engine. BACKGROUND

[0002] Under the background of energy structure transformation and increasingly stringent environmental protection requirements, methanol as a clean and renewable alternative fuel has gradually attracted attention in the field of engine application. Methanol fuel has the advantages of high octane value and less emission of combustion pollutants, but its physicochemical properties also bring significant technical challenges to the stable start of the engine, especially the cold start in low temperature environment, which has become one of the key bottlenecks restricting the large-scale application of methanol engine.

[0003] The core problem of existing methanol engine in the cold start process is caused by the low volatility and high latent heat of vaporization characteristics of methanol. When the ambient temperature or engine cylinder temperature is low, methanol fuel is difficult to fully vaporize, resulting in that fuel and air cannot form a uniform and stable combustible mixture. This uneven mixture will directly cause a series of start-up failures: on the one hand, the liquid methanol that is not fully vaporized is easy to adhere to the intake port wall or cylinder, which not only reduces the amount of fuel actually involved in combustion, but also may cause ignition failure, start delay, and in some scenarios even need to try multiple times to start; on the other hand, even if it is forced to start, the incomplete combustion of methanol will increase the emission of unburned hydrocarbons, formaldehyde and other pollutants in the exhaust gas, and the liquid methanol may also dilute the lubricating oil film on the cylinder wall, aggravating the wear of moving parts such as pistons and cylinder liners, and shortening the service life of the engine.

[0004] To address the aforementioned cold start challenges, existing technologies have proposed various solutions, such as overall cylinder block heating. This involves preheating the engine block using electric heating wires or coolant heating devices to increase the internal temperature and promote methanol vaporization. However, due to the large size and high heat capacity of the cylinder block, this solution consumes a significant amount of electrical energy (usually relying on the vehicle's battery). It not only suffers from low heating efficiency (preheating time often exceeds 10 minutes) but also easily leads to battery depletion, affecting the vehicle's subsequent normal operation. Furthermore, overall heating results in severe energy loss, with most of the heat not being applied to the intake air-fuel mixture, leading to energy waste and contradicting the energy-saving advantages of methanol fuel. Alternatively, adding low-boiling-point, highly volatile additives (such as gasoline or ethanol) to the methanol fuel can improve its low-temperature vaporization performance. However, this approach has significant limitations: firstly, the introduction of additives alters the original physicochemical properties of methanol fuel, potentially leading to decreased engine combustion efficiency and even requiring adjustments to the fuel injection system parameters to adapt to the mixed fuel, increasing system complexity and modification costs; secondly, the use of additives may also trigger new environmental problems (such as increased pollutant emissions after combustion of some additives), and long-term use may corrode seals and pipelines in the engine fuel system, affecting engine reliability. Therefore, it is essential to propose an intake air heating method for cold starting methanol engines. Summary of the Invention

[0005] The purpose of this invention is to provide an intake air heating method for cold starting of a methanol engine, which can efficiently and cost-effectively heat the engine before starting in a low-temperature environment, ensuring normal engine start-up, thereby solving the defects and unmet technical requirements of existing technologies.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an intake air heating method for cold starting of a methanol engine, comprising the following steps:

[0007] I. A system for heating intake air for cold starting a methanol engine is provided, comprising:

[0008] The main body has an air inlet.

[0009] A heating component, disposed inside the main body, is used to heat the air entering the main body;

[0010] A methanol engine intake pipe, one end of which is connected to the methanol engine and the other end is connected to the main body, serves as a channel for heated air to enter the methanol engine.

[0011] A controller, which is electrically connected to the heating assembly, is used to start and stop the heating assembly;

[0012] A sensor assembly is arranged on the methanol engine and electrically connected with the controller for monitoring the methanol engine parameters.

[0013] In the present application, the system content in the present application also includes:

[0014] A first connecting plate is connected with the end of the methanol engine air inlet pipe away from the methanol engine, for connecting the end of the methanol engine air inlet pipe with the main body.

[0015] A connecting assembly is arranged on the inner wall of the main body, and the connecting assembly comprises:

[0016] A first mounting groove is in communication with the air inlet for mounting a filter;

[0017] A second mounting groove is located on one side of the first mounting groove for mounting a heating assembly;

[0018] A third mounting groove is surrounded by a plurality of limiting ribs for fittingly mounting the first connecting plate.

[0019] The heating assembly comprises:

[0020] A heating element is arranged for heating the air entering the inside of the main body;

[0021] A mounting base is detachably connected with the heating element for carrying and mounting the heating element;

[0022] A second connecting plate is clamped in the second mounting groove, the upper part of which is detachably connected with the mounting base, and the second connecting plate is located above the first connecting plate.

[0023] In the present application, it needs to be further explained and stated that from the positions of the second connecting plate and the first connecting plate, it can be understood that in the present embodiment, the third mounting groove is located in the second mounting groove, and although the second connecting plate and the second mounting groove are clampedly connected, there are sealing measures, and a sealed air transfer space is formed between the second connecting plate and the bottom of the second mounting groove, and this control transfer space is in communication with the second air hole and the third air hole, which can more clearly explain the meaning that the second connecting plate is located above the first connecting plate.

[0024] An upper shell is provided with a first threaded connection hole;

[0025] A lower shell is provided with a second threaded connection hole;

[0026] A hand screw is arranged with one end passing through the first threaded connection hole and the second threaded connection hole in sequence for fittingly mounting the upper shell and the lower shell.

[0027] The connecting assembly is arranged on the lower shell.

[0028] The upper shell and the lower shell, the first connecting plate and the lower shell, and the first connecting plate and the methanol engine air inlet pipe are in sealed connection.

[0029] The heating member comprises:

[0030] An electric heating block is arranged on the mounting base, and a plurality of heating fins are arranged at the lower end of the electric heating block, and heating channels are formed between the heating fins;

[0031] A power supply is electrically connected with the electric heating member and is located on both sides of the electric heating member, and is used for supplying power to the electric heating block.

[0032] The controller is electrically connected with the power supply, and is used for controlling whether the power supply supplies power to the electric heating block.

[0033] A fourth mounting groove, a fifth mounting groove and a first air hole are formed in the mounting base, the fourth mounting groove is used for mounting the electric heating block, the fifth mounting groove is arranged on both sides of the fourth mounting groove and is used for mounting the power supply, the first air hole is formed in the bottom of the fourth mounting groove, and the first air hole is in communication with the heating channels;

[0034] A second air hole is formed in the second connecting plate, and the second air hole is in communication with the first air hole;

[0035] A third air hole is formed in the first connecting plate, one end of the third air hole is in communication with the second air hole, and the other end of the third air hole is in communication with the methanol engine air inlet pipe.

[0036] The sensor assembly comprises:

[0037] A cylinder temperature sensor is arranged on the engine and is electrically connected with the controller, and is used for monitoring the temperature of the engine;

[0038] A rotation speed sensor is arranged on the engine and is electrically connected with the controller, and is used for detecting whether the engine is successfully started;

[0039] An overheating protection member is arranged on the electric heating block and is electrically connected with the controller, and is used for monitoring the temperature of the electric heating block and preventing the electric heating block from being overloaded.

[0040] The mounting base and the second connecting plate are made of insulating and heat-insulating materials.

[0041] In the present application, it needs to be further explained that the cylinder temperature sensor is a temperature sensor for monitoring the temperature of the engine cylinder. Here, it is explained that the overheating protection device is also a temperature sensor for real-time feedback of the temperature of the electric heating device to the controller. If there is a tendency of overheating, the controller controls the electric heating device to stop heating or reduce the heating power.

[0042] II. Input relevant preset threshold value through controller

[0043] III. Real-time monitoring of methanol engine parameters through sensor assembly

[0044] IV. System regulation according to methanol engine parameters by controller

[0045] 4.1), the sensor monitors the temperature of the methanol engine, and the heating assembly is started when the temperature is low;

[0046] 4.2), the methanol engine crankshaft rotates, and the heated air is sucked into the methanol engine;

[0047] 4.3), the sensor assembly monitors the state of the methanol engine to determine whether the methanol engine is started;

[0048] 4.4), after the methanol engine is started, the related components stop running.

[0049] In the present application, it needs to be further explained that the meaning of the related components stopping running in step 4.4) is mainly to stop the heating assembly from working, while the controller works normally.

[0050] Preferably, in step 1), the system further comprises:

[0051] The filter is arranged inside the main body and located at the air inlet to filter the air entering from the air inlet;

[0052] The overheating protection device is arranged on the heating assembly and electrically connected with the controller to prevent the heating assembly from overloading;

[0053] The electronic throttle valve is arranged on the methanol engine air inlet pipe and electrically connected with the controller to control the air flow through the methanol engine air inlet pipe.

[0054] Preferably, the preset threshold value in step 2) includes: a cylinder temperature preset threshold value that can ensure the start of the methanol engine, an engine speed preset threshold value that can determine the start of the engine, and a heating preset threshold value that can prevent the heating assembly from overloading;

[0055] The engine parameters to be monitored in step 3) include the cylinder temperature and the engine speed of the methanol engine.

[0056] Preferably, the specific content of step 4.1) is:

[0057] 4.1.1), real-time monitoring of the cylinder temperature of the methanol engine by the cylinder temperature sensor in the sensor assembly, and transmitting the monitored cylinder temperature data to the controller;

[0058] 4.1.2), the controller compares the received cylinder temperature with the cylinder temperature preset threshold;

[0059] 4.1.3), if the cylinder temperature is lower than the cylinder temperature preset threshold, start the system;

[0060] 4.1.4), if the cylinder temperature is higher than the cylinder temperature preset threshold, start the engine normally.

[0061] Preferably, in step 4.1.3), after starting the system, the controller needs to perform the following operations: send a stop pumping signal to the electronic oil pump, at the same time send an opening increase signal to the electronic throttle valve, and issue an instruction to rotate the engine crankshaft. In this application, the electronic oil pump and the crankshaft are components used in conjunction with the transmitter and are commonly used by those skilled in the art, so they are used as prior art.

[0062] Preferably, the specific content of step 4.2) is:

[0063] 4.2.1), the electronic throttle valve opening is increased, the heating assembly starts to work, and the engine crankshaft starts to rotate;

[0064] 4.2.2), the air entering the main body from the air inlet is filtered by the filter and then heated by the heating assembly;

[0065] In combination with the detailed content of the system in the foregoing, this step can be understood as follows: the air enters the main body from the air inlet, is filtered by the filter, then enters the heating channel and is heated by the electric heating block, and after being filtered and heated, the air passes through the first air hole, the second air hole and the third air hole, and is finally sucked into the methanol engine intake pipe by the force of the rotating crankshaft. The air can also enter the main body from the air inlet due to the rotation of the crankshaft.

[0066] 4.2.3), the heated air is sucked into the methanol engine intake pipe by the rotating crankshaft, and then is delivered into the engine cylinder.

[0067] Preferably, in step 4.2.1), the output power of the heating assembly is determined by the temperature difference between the cylinder temperature in step 4.1.2) and the cylinder temperature preset threshold, and the higher the output power of the electric heating block controlled by the controller.

[0068] Preferably, the specific content of step 4.3) is:

[0069] 4.3.1), the cylinder temperature sensor in the sensor assembly continuously monitors the cylinder temperature and feeds back to the controller, if the monitored temperature reaches the preset cylinder temperature threshold, the controller sends a signal to start the electronic oil pump, and starts to start the engine;

[0070] 4.3.2), the speed sensor in the sensor assembly continuously monitors the engine speed and feeds back to the controller, if the monitored speed reaches the preset engine speed threshold and reaches the stable idle speed, the system is closed.

[0071] In this application, when the system is closed, it is opposite to the operation described above, so it is not specifically introduced here.

[0072] Preferably, the air heating and information feedback in steps 4.2) and 4.3) are carried out at the same time, and the process further includes:

[0073] When the heating assembly is continuously heating, the controller receives the temperature feedback of the cylinder temperature sensor in real time, and adjusts the working state of the heating assembly and the opening degree of the electronic throttle valve in real time;

[0074] When the heating assembly is started, the controller receives the heating assembly temperature feedback of the overheat protection device in real time, if the temperature of the electric heating block exceeds the preset heating threshold, the overheat protection device triggers the protection mechanism, and the controller controls the heating assembly to reduce the heating power or stop the heating assembly heating.

[0075] Preferably, the preset cylinder temperature threshold is preset according to the model and parameters of the methanol engine.

[0076] Compared with the prior art, the application has the beneficial effects that:

[0077] 1, this application relies on the real-time data feedback of the cylinder temperature sensor and the speed sensor, and the controller can realize multi-dimensional intelligent control: automatically start the heating assembly at low temperature, adjust the opening degree of the electronic throttle valve according to the change of the cylinder temperature (reduce the opening degree when the cylinder temperature rises), avoid the influence of too large or too small air intake on combustion; stop heating immediately after the engine starts successfully (detected by the speed sensor), to prevent excessive energy consumption and overheating of parts. Adapt to the starting demand in different low temperature environment.

[0078] 2, the air delivery path sealing design of the application avoids air leakage, ensures that the heated air enters the combustion chamber efficiently, and ensures the combustion efficiency; the filter at the air inlet can filter dust and impurities in the air, prevent particulate matter from entering the engine to cause cylinder wear or injection nozzle blockage, further prolong the service life of the engine and reduce the risk of failure.

[0079] 3, The application only heats the air entering the engine, without consuming a large amount of electric energy to heat the cylinder with large volume and high heat capacity, thereby greatly reducing energy consumption. Meanwhile, the mounting base and the second connecting plate are made of insulating and heat-insulating materials, heat loss is reduced, energy utilization efficiency is further improved, the risk of vehicle battery power loss is avoided, and the energy-saving advantage of the methanol engine itself is highly matched. In addition, the cost is low and easy to replace, reducing the later maintenance cost. BRIEF DESCRIPTION OF DRAWINGS

[0080] Figure 1 It is the overall logic diagram of the application;

[0081] Figure 2 It is the overall structure of the system in the application;

[0082] Figure 3 It is a partial structure of the system in the application;

[0083] Figure 4 It is a partial structure diagram of the heating assembly in the application;

[0084] In the figure: main body 1, heating assembly 2, methanol engine air inlet pipe 3, air inlet 4, filter 5, second mounting groove 6, overheat protection 7, mounting base 8, second connecting plate 9, upper shell 10, lower shell 11, hand screw 12, electric heating block 13, heating fin 14, heating channel 15, power supply 16, third air hole 17, electronic throttle valve 18, first connecting plate 19, positioning mounting hole 20. DETAILED DESCRIPTION

[0085] The specific embodiments of the application will be described below with reference to the accompanying drawings. Figures 1-4 The technical solutions in the embodiments of the application are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the application, not all. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the application.

[0086] In the description of the application, it should be understood that: the terms "first", "second" are only for description purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features with "first", "second" can be explicitly or implicitly included one or more features.

[0087] Please refer to Figures 1-4 The embodiments of the application:

[0088] Embodiments:

[0089] As Figures 1-4The application discloses an air intake heating method for cold start of a methanol engine.

[0090] The application discloses an air intake heating system for cold start of a methanol engine.

[0091] A main body 1 is provided with an air inlet 4;

[0092] A heating assembly 2 is arranged in the main body 1 and used for heating air entering the main body 1.

[0093] A methanol engine air inlet pipe 3 is connected with the methanol engine at one end and connected with the main body 1 at the other end, and used as a channel for the heated air to enter the methanol engine.

[0094] A controller is electrically connected with the heating assembly 2 and used for starting and stopping the heating assembly 2.

[0095] A sensor assembly is arranged on the methanol engine and electrically connected with the controller and used for monitoring parameters of the methanol engine.

[0096] A filter 5 is arranged in the main body 1 and located at the air inlet 4 and used for filtering air entering from the air inlet 4; in the embodiment, the filter 5 is arranged as a sponge filter 5 and used for filtering dust and impurities of the air entering the main body 1 and preventing particulate matters from entering the interior of the engine.

[0097] An overheating protection member 7 is arranged on the heating assembly 2 and electrically connected with the controller and used for preventing the heating assembly 2 from overloading.

[0098] An electronic throttle valve is arranged on the methanol engine air inlet pipe 3 and electrically connected with the controller and used for controlling air flow through the methanol engine air inlet pipe 3.

[0099] A first connecting plate 19 is connected with an end of the methanol engine air inlet pipe 3 away from the methanol engine and used for connecting the end of the methanol engine air inlet pipe 3 with the main body 1.

[0100] A connecting assembly is arranged on an inner wall of the main body 1.

[0101] Specifically, the connecting assembly comprises:

[0102] A first mounting groove is in communication with the air inlet 4 and used for mounting the filter 5.

[0103] A second mounting groove 6 is located at one side of the first mounting groove and used for mounting the heating assembly 2.

[0104] A third mounting groove is surrounded by a plurality of limiting ribs, and is used for fitting and mounting the first connecting plate 19.

[0105] The heating assembly 2 comprises:

[0106] A heating element is used for heating air entering the inside of the main body 1.

[0107] An installation base 8 is detachably connected with the heating element, and is used for bearing the heating element.

[0108] A second connecting plate 9 is clamped in the second mounting groove 6, the upper portion of the second connecting plate 9 is detachably connected with the installation base 8, and the second connecting plate 9 is located above the first connecting plate 19.

[0109] The main body 1 comprises:

[0110] An upper shell 10 is provided with a first threaded connection hole.

[0111] A lower shell 11 is provided with a second threaded connection hole.

[0112] A hand screw 12 is sequentially inserted into the first threaded connection hole and the second threaded connection hole, and is used for fitting and mounting the upper shell 10 and the lower shell 11.

[0113] The connecting assembly is arranged on the lower shell 11.

[0114] The heating element comprises:

[0115] An electric heating block 13 is arranged on the installation base 8, and is provided with a plurality of heating fins 14 at the lower end, and a heating channel 15 is formed between the heating fins 14.

[0116] A power supply 16 is electrically connected with the electric heating element, and is arranged on both sides of the electric heating element, and is used for supplying power to the electric heating block 13.

[0117] The controller is electrically connected with the power supply 16, and is used for controlling whether the power supply 16 supplies power to the electric heating block 13.

[0118] The sensor assembly comprises:

[0119] A cylinder temperature sensor is arranged on the engine, and is electrically connected with the controller, and is used for monitoring the temperature of the engine.

[0120] A rotating speed sensor is arranged on the engine, and is electrically connected with the controller, and is used for detecting whether the engine is successfully started.

[0121] A overheating protection 7 is arranged on the electric heating block 13 and electrically connected with the controller, for monitoring the temperature of the electric heating block 13 and preventing the electric heating block 13 from overloading.

[0122] An electronic throttle valve 18 is arranged on the methanol engine air inlet pipe 3 and electrically connected with the controller.

[0123] The mounting base 8 is provided with a fourth mounting groove for mounting the electric heating block 13, a fifth mounting groove arranged on both sides of the fourth mounting groove for mounting the power supply 16, and a first air hole arranged at the bottom of the fourth mounting groove and communicating with the heating channel 15.

[0124] The second connecting plate 9 is provided with a second air hole communicating with the first air hole.

[0125] The first connecting plate 19 is provided with a third air hole 17 communicating with the second air hole at one end and with the methanol engine air inlet pipe 3 at the other end.

[0126] In this embodiment, a plurality of positioning mounting holes 20 are arranged around the third connecting hole of the first connecting plate 19, and the positioning mounting holes 20 are used for positioning and connecting the first connecting plate 19 and the methanol engine air inlet pipe 3. The connection between the third connecting hole and the methanol engine air inlet pipe 3 is achieved by a common connection method in the prior art, which will not be described here. For example, a ring-shaped plate is fixedly and sealingly arranged on the methanol engine air inlet pipe 3, the mounting holes of the plate are adapted to the positioning mounting holes 20, and common connecting components such as screws, metal gaskets and rubber gaskets are used for connection. In the example, the rubber gasket is used for sealing. Since the present application relates to a gas conveying device, sealing measures are adopted for all connections that can be in contact with the outside except the air inlet 4.

[0127] The upper shell 10 and the lower shell 11, the first connecting plate 19 and the lower shell 11, and the first connecting plate 19 and the methanol engine air inlet pipe 3 are sealingly connected, and the leakage of heated air is prevented by preset sealing measures to ensure that the heated air efficiently enters the methanol engine air inlet pipe 3.

[0128] The mounting base 8 and the second connecting plate 9 are made of insulating and heat-insulating materials to reduce heat loss during heating and improve energy utilization efficiency.

[0129] II. Inputting the related preset threshold values through the controller

[0130] The preset threshold value includes: a cylinder temperature preset threshold value capable of ensuring the start of the methanol engine, an engine speed preset threshold value capable of determining the start of the engine, and a heating preset threshold value for preventing the overloading of the heating assembly 2, wherein the cylinder temperature preset threshold value is preset according to the model and parameters of the methanol engine.

[0131] III. Real-time monitoring of the parameters of the methanol engine by the sensor assembly

[0132] The engine parameters that need to be monitored include the cylinder temperature and the engine speed of the methanol engine.

[0133] IV. System control by the controller according to the parameters of the methanol engine

[0134] 4.1), the sensor monitors the temperature of the methanol engine, and the heating assembly 2 is started at low temperature;

[0135] 4.1.1), the cylinder temperature of the methanol engine is monitored in real time by the cylinder temperature sensor in the sensor assembly, and the monitored cylinder temperature data is transmitted to the controller;

[0136] 4.1.2), the controller compares the received cylinder temperature with the cylinder temperature preset threshold value;

[0137] 4.1.3), if the cylinder temperature is lower than the cylinder temperature preset threshold value, the system is started;

[0138] After the system is started, the controller needs to perform the following operations: sending a stop pumping signal to the electronic oil pump, sending an opening increase signal to the electronic throttle valve 18, and issuing an instruction to rotate the engine crankshaft.

[0139] 4.1.4), if the cylinder temperature is higher than the cylinder temperature preset threshold value, the engine is normally started.

[0140] 4.2), the methanol engine crankshaft rotates, and the heated air is sucked into the methanol engine;

[0141] 4.2.1), the opening of the electronic throttle valve is increased, the heating assembly 2 starts to work, and the engine crankshaft starts to rotate;

[0142] The output power of the heating assembly is referenced to the temperature difference between the cylinder temperature in step 4.1.2) and the cylinder temperature preset threshold value, and the higher the output power of the controller controlling the electric heating block 13.

[0143] 4.2.2), the air entering the main body 1 from the air inlet 4 is filtered by the filter 5 and then heated by the heating assembly 2;

[0144] Specifically, the heated air passes through the first air hole of the mounting base 8, the second air hole of the second connecting plate 9 and the third air hole 17 of the first connecting plate 19 in sequence, and is sucked into the methanol engine intake pipe 3 by the rotating crankshaft.

[0145] 4.2.3), the heated air is sucked into the methanol engine intake pipe 3 by the rotating crankshaft, and then is delivered into the engine cylinder.

[0146] 4.3), the sensor assembly monitors the state of the methanol engine and determines whether the methanol engine is started;

[0147] 4.3.1), the cylinder temperature sensor in the sensor assembly continuously monitors the cylinder temperature and feeds back to the controller. If the monitored temperature reaches the preset cylinder temperature threshold, the controller sends a signal to start the electronic oil pump and starts the engine.

[0148] 4.3.2), the speed sensor in the sensor assembly continuously monitors the engine speed and feeds back to the controller. If the monitored speed reaches the preset engine speed threshold and reaches the stable idle speed, the system is closed.

[0149] 4.4), after the methanol engine is started, the related components stop running.

[0150] The air heating and information feedback in steps 4.2) and 4.3) are performed simultaneously, and the process further includes:

[0151] When the heating assembly 2 is continuously heating, the controller receives the temperature feedback of the cylinder temperature sensor in real time, and adjusts the working state of the heating assembly 2 and the opening of the electronic throttle valve in real time;

[0152] When the heating assembly 2 is started, the controller receives the temperature feedback of the heating assembly 2 from the overheat protection device 7 in real time. If the temperature of the electric heating block 13 exceeds the preset heating threshold, the overheat protection device 7 triggers the protection mechanism, and the controller controls the heating assembly 2 to reduce the heating power or stop the heating of the heating assembly 2.

[0153] During the whole control process, the controller receives the feedback signals of various sensors and execution components in real time. If the signal is interrupted or abnormal, the controller sends a fault prompt signal and stops the current control process.

[0154] The foregoing merely illustrates the principles of the application and application of its leading features. This application is not limited to the illustrative embodiments shown and described herein. Rather, this application is capable of operating within a further range of conditions and environments than those specifically described herein, and further modifications can be made without departing from the spirit or scope of the application. Accordingly, the description is to be construed as illustrative only and not restrictive of the broad disclosure or application of the application. The specification and drawings are, accordingly, to be regarded simply as illustrative and with the scope of the application being measured by the appended claims, and not with the specification. No admission is made that any reference constitutes prior art. It is my intent, therefore, to be limited only as appears in the following claims.

[0155] Furthermore, it should be understood that although the description above relates to embodiments, not every embodiment contains only one independent technical solution, and the description above is only for the sake of clarity, and those skilled in the art should understand the description as a whole, and the technical solutions in each embodiment can be combined appropriately to form other embodiments that those skilled in the art can understand.

Claims

1. A method for heating intake air for cold start of a methanol engine, characterized by, The method comprises the following steps: I. providing an air heating system for cold start of a methanol engine, comprising: a main body, an air inlet being formed on the main body; a heating assembly arranged in the main body for heating air entering the main body; a methanol engine air inlet pipe, one end of which is connected with the methanol engine and the other end of which is connected with the main body, serving as a channel for the heated air to enter the methanol engine; a controller, which is electrically connected with the heating assembly, for starting and stopping the heating assembly; a sensor assembly arranged on the methanol engine and electrically connected with the controller for monitoring parameters of the methanol engine; II. inputting relevant preset thresholds through the controller III. monitoring parameters of the methanol engine in real time through the sensor assembly IV. system control according to the parameters of the methanol engine by the controller 4.1), the sensor monitors the temperature of the methanol engine, and the heating assembly is started when the temperature is low; 4.2), the methanol engine crankshaft rotates to suck the heated air into the methanol engine; 4.3), the sensor assembly monitors the state of the methanol engine to determine whether the methanol engine is started; 4.4), after the methanol engine is started, the related components stop running.

2. The method for heating intake air for cold start of a methanol engine according to claim 1, wherein In the step I), the system further comprises: a filter arranged in the main body at the air inlet for filtering air entering from the air inlet; an overheating protection device arranged on the heating assembly and electrically connected with the controller for preventing overloading of the heating assembly; an electronic throttle valve arranged on the methanol engine air inlet pipe and electrically connected with the controller for controlling air flow through the methanol engine air inlet pipe.

3. The method for heating intake air for cold start of a methanol engine according to claim 2, wherein The preset thresholds in the step II) include: a cylinder temperature preset threshold that can ensure the start of the methanol engine, an engine speed preset threshold that can determine the start of the engine, and a heating preset threshold that can prevent overloading of the heating assembly. The engine parameters to be monitored in the step III) include: the cylinder temperature and the engine speed of the methanol engine.

4. The method according to claim 3, wherein the step 4.1) specifically comprises: 4.1.1), monitoring the cylinder temperature of the methanol engine in real time through the cylinder temperature sensor in the sensor assembly and transmitting the monitored cylinder temperature data to the controller; 4.1.2), comparing the received cylinder temperature with the cylinder temperature preset threshold by the controller; 4.1.3), starting the system if the cylinder temperature is lower than the cylinder temperature preset threshold; 4.1.4), normally starting the engine if the cylinder temperature is higher than the cylinder temperature preset threshold.

5. The method for heating intake air for cold start of a methanol engine according to claim 4, wherein In the step 4.1.3), after starting the system, the controller needs to perform the following operations: sending a stop pumping signal to the electronic pump and a valve opening increasing signal to the electronic throttle valve, and issuing an instruction to rotate the engine crankshaft.

6. The method for heating intake air for cold start of a methanol engine according to claim 1, 2, 3, 4 or 5, characterized in that, The step 4.2) specifically comprises: 4.2.1), increasing the opening of the electronic throttle valve, starting the heating assembly, and starting the rotation of the engine crankshaft; 4.2.2), the air from the air inlet into the main body, after filtering by the filter, is heated by the heating assembly; 4.2.3), the heated air is sucked into the intake pipe of the methanol engine by the rotating crankshaft, and then is delivered into the cylinder of the engine.

7. The method for heating intake air for cold start of a methanol engine according to claim 6, wherein The output power of the heating assembly in step 4.2.1) is controlled by the controller according to the temperature difference between the cylinder temperature in step 4.1.2) and the preset cylinder temperature threshold.

8. The method for heating intake air for cold start of a methanol engine according to claim 7, wherein The specific content of step 4.3) is: 4.3.1), the cylinder temperature sensor in the sensor assembly continuously monitors the cylinder temperature and feeds back to the controller. If the monitored temperature reaches the preset cylinder temperature threshold, the controller sends a signal to start the electronic oil pump and starts the engine; 4.3.2), the speed sensor in the sensor assembly continuously monitors the engine speed and feeds back to the controller. If the monitored speed reaches the preset engine speed threshold and reaches the stable idle speed, the system is turned off.

9. The method for heating intake air for cold start of a methanol engine according to claim 8, wherein The air heating and information feedback in steps 4.2) and 4.3) are carried out simultaneously, and the process also includes: When the heating assembly is continuously heating, the controller receives the temperature feedback of the cylinder temperature sensor in real time, and adjusts the working state of the heating assembly and the opening of the electronic throttle valve in real time; When the heating assembly is started, the controller receives the temperature feedback of the heating assembly from the overheat protection device in real time. If the temperature of the electric heating block exceeds the preset heating threshold, the overheat protection device triggers the protection mechanism, and the controller controls the heating assembly to reduce the heating power or stop the heating of the heating assembly.

10. The method for heating intake air for cold start of a methanol engine according to claim 3, wherein The preset cylinder temperature threshold is preset according to the model and parameters of the methanol engine.

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