Ignition method, device, medium and methanol engine system for methanol engine

Abstract

The application provides a kind of ignition method, device, medium and methanol engine system of methanol engine.The method determines whether early ignition or knock occurs by analyzing the pressure and temperature at the current time, according to the fault judgment result, the ignition mode can be intelligently adjusted, if potential early ignition or knock is detected, the system will adjust from the initial ignition mode to the ignition mode using more spark plugs, such as using the main spark plug and all auxiliary spark plugs at the same time, or only using the main spark plug to ignite, to reduce the instability in the combustion process, to suppress the occurrence of abnormal combustion phenomenon, once the final ignition mode is determined, the system will execute ignition according to the mode, thereby effectively controlling early ignition, knock and other faults without sacrificing engine performance, thereby solving the problem that the existing scheme is difficult to suppress early ignition and knock phenomenon of methanol engine during ignition period.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of methanol engine, in particular to a methanol engine ignition method, a methanol engine ignition device, a computer readable storage medium and a methanol engine system. BACKGROUND

[0002] In the prior art, the methanol engine is difficult to start under low temperature conditions, especially in cold regions and cold seasons, because of the low vapor pressure characteristics of methanol and the low intake air temperature caused by the difficulty of methanol evaporation, which affects the starting performance of the methanol engine. At the same time, under high load conditions, the methanol engine is prone to abnormal combustion phenomena such as pre-ignition and knock, which limits the increase of compression ratio and thus affects the thermal efficiency of the engine.

[0003] That is, the prior art is difficult to suppress the pre-ignition and knock phenomena of the methanol engine during the ignition period. SUMMARY

[0004] The main purpose of the present application is to provide a methanol engine ignition method, a methanol engine ignition device, a computer readable storage medium and a methanol engine system to at least solve the problem that the prior art is difficult to suppress the pre-ignition and knock phenomena of the methanol engine during the ignition period.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a methanol engine ignition method is provided, which is applied to a controller in a methanol engine system, the methanol engine system further comprising one main spark plug and three auxiliary spark plugs, the main spark plug being installed at the top center position of the cylinder of the methanol engine, and the three auxiliary spark plugs being arranged around the main spark plug, the method comprising: obtaining the pressure and / or temperature of the cylinder at the current time to obtain the current pressure and / or current temperature; determining a judgment result according to the current pressure and / or current temperature, the judgment result representing whether the methanol engine has a target fault, the target fault at least including one of pre-ignition and knock; determining whether to modify the initial ignition mode according to the judgment result to determine the final ignition mode, and igniting by using the final ignition mode, the initial ignition mode representing ignition by using the three auxiliary spark plugs, and the final ignition mode being one of ignition by using the three auxiliary spark plugs, ignition by using the main spark plug and the three auxiliary spark plugs, and ignition by using the main spark plug.

[0006] Optionally, according to the determination result, it is determined whether to modify the initial ignition mode to determine the final ignition mode, including: in the case that the determination result represents that the methanol engine has the target fault, the initial ignition mode is modified to use the main spark plug and the three auxiliary spark plugs for ignition to determine the final ignition mode as using the main spark plug and the three auxiliary spark plugs for ignition; in the case that the determination result represents that the methanol engine does not have the target fault, the initial ignition mode is modified to use the main spark plug for ignition to obtain a current ignition mode, and the determination result is determined again; according to the determination result determined again, it is determined whether to modify the current ignition mode to determine the final ignition mode.

[0007] Optionally, according to the determination result determined again, it is determined whether to modify the current ignition mode to determine the final ignition mode, including: in the case that the determination result determined again represents that the methanol engine does not have the target fault, it is determined that the current ignition mode does not need to be modified to determine the final ignition mode as the current ignition mode; in the case that the determination result determined again represents that the methanol engine has the target fault, the current ignition mode is modified to use the three auxiliary spark plugs for ignition to determine the final ignition mode as using the three auxiliary spark plugs for ignition.

[0008] Optionally, after the final ignition mode is determined, the method further includes: determining a current occurrence number of the target fault in a preset time period; and adjusting the ignition number and / or ignition time of the methanol engine according to the current occurrence number.

[0009] Optionally, according to the current pressure, a determination result is determined, the determination result representing whether the methanol engine has a target fault, including: in the case that the current pressure is greater than or equal to a pressure threshold value, it is determined that the determination result represents that the methanol engine has the target fault; in the case that the current pressure is less than the pressure threshold value, it is determined that the determination result represents that the methanol engine does not have the target fault.

[0010] Optionally, according to the current temperature, a determination result is determined, including: in the case that the current temperature is greater than or equal to a temperature threshold value, it is determined that the determination result represents that the methanol engine has the target fault; in the case that the current temperature is less than the temperature threshold value, it is determined that the determination result represents that the methanol engine does not have the target fault.

[0011] Optionally, the determining the determination result according to the current pressure and the current temperature comprises: determining that the determination result represents that the methanol engine has the target fault in a case that the current pressure is greater than or equal to a pressure threshold value and the current temperature is greater than or equal to a temperature threshold value; and determining that the determination result represents that the methanol engine does not have the target fault in a case that the current pressure is less than the pressure threshold value and / or the current temperature is less than the temperature threshold value.

[0012] According to another aspect of the present application, there is provided an ignition device of a methanol engine, comprising: an acquisition unit configured to acquire a pressure and / or a temperature of a cylinder at a current time, to obtain a current pressure and / or a current temperature; a first determination unit configured to determine a determination result according to the current pressure and / or the current temperature, the determination result representing whether a target fault of the methanol engine occurs, the target fault at least comprising one of pre-ignition and knock; and a second determination unit configured to determine whether to modify an initial ignition mode according to the determination result, to determine a final ignition mode, and to ignite according to the final ignition mode, wherein the initial ignition mode represents that three auxiliary spark plugs are used for ignition, and the final ignition mode is one of the three auxiliary spark plugs, the main spark plug and the three auxiliary spark plugs, and the main spark plug is installed at a top center position of a cylinder of the methanol engine, and the three auxiliary spark plugs are arranged around the main spark plug.

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

[0014] According to yet another aspect of the present application, there is provided a methanol engine system, comprising: a controller, a main spark plug and three auxiliary spark plugs, the main spark plug is installed at a top center position of a cylinder of the methanol engine, the three auxiliary spark plugs are arranged around the main spark plug, and the controller is configured to perform any of the methods.

[0015] The technical scheme of the application is applied to determine whether pre-ignition or knock occurs by analyzing the pressure and temperature at the current moment, and intelligently adjust the ignition mode according to the fault judgment result, if potential pre-ignition or knock is detected, the system will adjust from the initial ignition mode (only use auxiliary spark plug ignition) to the ignition mode using more spark plugs, such as using the main spark plug and all auxiliary spark plugs at the same time, or only using the main spark plug to ignite, so as to reduce the instability in the combustion process and inhibit the occurrence of abnormal combustion phenomenon, once the final ignition mode is determined, the system will execute ignition according to the mode, thereby effectively controlling pre-ignition, knock and other faults without sacrificing engine performance, avoiding the overly conservative ignition strategy in the traditional method, so that the methanol engine can also achieve high thermal efficiency and power performance under high load conditions, reducing the mechanical stress inside the engine and prolonging the service life of the engine, thereby solving the problem that the prior art is difficult to inhibit the occurrence of pre-ignition and knock of the methanol engine during the ignition period. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the present application, and together with the description of the present application, serve to explain the present application. The present application is illustrated by the accompanying drawings, and the description of the present application is used to explain the present application, and does not constitute an improper limitation on the present application. In the drawings:

[0017] Figure 1 A schematic diagram showing the positional relationship of three peripheral auxiliary spark plugs and one central main spark plug is shown;

[0018] Figure 2 A flowchart of an ignition method of a methanol engine according to an embodiment of the present application is shown;

[0019] Figure 3 A flowchart of an ignition method of a methanol engine according to an embodiment of the present application is shown;

[0020] Figure 4 A flowchart of an ignition method of a methanol engine according to an embodiment of the present application is shown;

[0021] Figure 5 A flowchart of another ignition method of a methanol engine according to an embodiment of the present application is shown;

[0022] Figure 6 A block diagram of the structure of an ignition device of a methanol engine according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0023] It should be noted that the embodiments and features in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0024] In order to make the personnel in the technical field better understand the scheme of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0025] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or a chronological sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0026] As introduced in the background, in the prior art, the methanol engine is difficult to start under low temperature conditions, especially in cold regions and cold seasons, due to the low vapor pressure characteristics of methanol and the low temperature of the intake air caused by the difficulty of methanol evaporation, thereby affecting the starting performance of the methanol engine. At the same time, under high load working conditions, the methanol engine is prone to abnormal combustion phenomena such as pre-ignition and knocking, which limits the increase of the compression ratio, and thus affects the thermal efficiency of the engine. In order to solve the problem that the prior art is difficult to suppress the pre-ignition and knocking phenomenon of the methanol engine during the ignition period, the embodiments of the present application provide a methanol engine ignition method, a methanol engine ignition device, a computer readable storage medium and a methanol engine system.

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application.

[0028] In the present embodiment, a methanol engine ignition method is provided. It should be noted that the steps shown in the flowchart of the drawings can be executed in a computer system such as a set of computer executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described herein can be executed in a different order.

[0029] The method is applied to a controller in a methanol engine system, the methanol engine system further comprising a main spark plug and three auxiliary spark plugs, the main spark plug being installed at a top center position of a cylinder of the methanol engine, and the three auxiliary spark plugs being arranged around the main spark plug. Three peripheral auxiliary spark plugs (peripheral auxiliary spark plug 1, peripheral auxiliary spark plug 2, and peripheral auxiliary spark plug 3) are equidistantly arranged around the central main spark plug, as shown in Figure 1 .

[0030] Figure 2 is a flowchart of a methanol engine ignition method according to an embodiment of the present application. As shown in Figure 2 , the method comprises the following steps:

[0031] In step S201, the pressure and / or temperature of the cylinder at the current time are obtained to obtain the current pressure and / or current temperature.

[0032] In step S202, the current pressure and / or the current temperature are used to determine a judgment result, the judgment result indicating whether a target fault occurs in the methanol engine, the target fault at least including one of pre-ignition and knock.

[0033] Pre-ignition: an abnormal combustion phenomenon with randomness, contingency and severe damage occurring in the operation process of a hydrogen internal combustion engine, ignited by self-ignition without spark plug; the ignition delay is significantly shorter, and the combustion start time caused by self-ignition is within 10 deg.CA earlier than the ignition angle; sometimes accompanied by strong high-frequency pressure vibration caused by end mixture self-ignition.

[0034] Knock: under certain conditions, the combustion of a hydrogen engine becomes abnormal, the pressure curve appears high-frequency large fluctuation, at this time the flame propagation speed and flame front shape change sharply, accompanied by metal vibration sound.

[0035] In step S203, according to the judgment result, it is determined whether to modify the initial ignition mode to determine the final ignition mode, and the final ignition mode is used for ignition, the initial ignition mode indicating that the three auxiliary spark plugs are used for ignition, and the final ignition mode being one of the following: the three auxiliary spark plugs are used for ignition, the main spark plug and the three auxiliary spark plugs are used for ignition, and the main spark plug is used for ignition.

[0036] In the above steps, whether pre-ignition or knock occurs is determined by analyzing the pressure and temperature at the current time, and according to the judgment result of the fault, the ignition mode can be intelligently adjusted. If potential pre-ignition or knock is detected, the system will adjust from the initial ignition mode (only using the auxiliary spark plug to ignite) to an ignition mode using more spark plugs, such as using the main spark plug and all auxiliary spark plugs at the same time, or only using the main spark plug to ignite, in order to reduce the instability in the combustion process and inhibit the occurrence of abnormal combustion. Once the final ignition mode is determined, the system will perform ignition according to this mode, thereby effectively controlling pre-ignition, knock and other faults without sacrificing engine performance. The overly conservative ignition strategy in the traditional method is avoided, so that the methanol engine can also achieve high thermal efficiency and power performance under high load conditions, reducing the mechanical stress inside the engine and prolonging the service life of the engine, thereby solving the problem that the existing scheme is difficult to inhibit the occurrence of pre-ignition and knock in the ignition period of the methanol engine.

[0037] In an embodiment of the present application, as shown in Figure 3 the step S203 of determining whether to modify the initial ignition mode according to the above judgment result to determine the final ignition mode includes the following steps:

[0038] Step S301, in the case where the above judgment result indicates that the above target fault occurs in the above methanol engine, the above initial ignition mode is modified to use the above main spark plug and the above three auxiliary spark plugs to ignite, so as to determine that the above final ignition mode is to use the above main spark plug and the above three auxiliary spark plugs to ignite;

[0039] Step S302, in the case where the above judgment result indicates that the above target fault does not occur in the above methanol engine, the above initial ignition mode is modified to use the above main spark plug to ignite, to obtain the current ignition mode, and the above judgment result is determined again;

[0040] Step S303, according to the above judgment result determined again, it is determined whether to modify the above current ignition mode to determine the above final ignition mode.

[0041] In the present application, a specific use scenario of step S203 is provided: the car is started in the cold winter morning, at this time the outside temperature is very low, and the engine intake temperature is also relatively low, which poses a challenge to the evaporation and vaporization of methanol, resulting in difficult start. As the driver gradually brings the car into high load conditions, such as driving on the highway, the combustion conditions of the engine become complex and are prone to pre-ignition or knock. At this time, the ignition system and control strategy of the present application begin to play a role.

[0042] Start-up condition: When the vehicle starts, the system automatically uses all four spark plugs (the central main spark plug and the three auxiliary spark plugs) for ignition to ensure that the engine can start quickly and stably even at extremely low temperatures. This strategy increases the number of ignition points, thereby increasing the ignition energy, helping methanol to evaporate and burn better, and overcoming the problem of low-temperature start-up.

[0043] High-load condition: When the vehicle enters high-speed driving or high-load conditions requiring large torque output, the system will determine whether there is a risk of pre-ignition or knocking based on real-time monitoring of in-cylinder pressure and temperature. If signs of abnormal combustion are detected, the system will immediately adjust the ignition mode to the final ignition mode (i.e., step S301) using the central main spark plug and all three auxiliary spark plugs for simultaneous ignition to reduce the flame propagation distance and suppress pre-ignition and knocking phenomena, ensuring the stability and efficiency of engine operation.

[0044] If the system determines that the engine does not have pre-ignition or knocking under the current working condition (i.e., step S302), it will attempt to switch to the current ignition mode using only the central main spark plug for ignition. The system will again monitor the combustion state, and if it confirms that the engine operates normally without pre-ignition or knocking (i.e., step S303), it will set this ignition mode as the final ignition mode, thereby optimizing the ignition energy, improving fuel economy and thermal efficiency while ensuring normal engine operation.

[0045] The beneficial effects of a specific use scenario of step S203: In low-temperature environments, using all four spark plugs for ignition significantly improves the success rate of start-up and reduces the risk of start-up failure or delay; in high-load conditions, the intelligent control strategy adjusts the ignition mode in real time, effectively suppressing pre-ignition and knocking phenomena, improving the stability and efficiency of combustion, and protecting the engine from abnormal combustion; by dynamically selecting the most suitable ignition mode, unnecessary energy waste is avoided, improving the thermal efficiency and overall energy efficiency of the methanol engine, thereby saving fuel and reducing emissions; stable and reliable start-up and operation without abnormal combustion not only ensure the power performance of the vehicle but also reduce engine vibration and noise, improving the comfort and satisfaction of the driver.

[0046] In an embodiment of the present application, step S303, i.e., determining whether to modify the current ignition mode based on the re-determined judgment result to determine the final ignition mode, includes the following steps:

[0047] Step S401, in the case where the re-determined judgment result indicates that the methanol engine does not have the target fault, it is determined that the current ignition mode does not need to be modified to determine the final ignition mode as the current ignition mode.

[0048] Step S402, in the case where the above determination result represents that the above methanol engine has the above target fault, the above current ignition mode is modified to use the above three auxiliary spark plugs for ignition, so as to determine the final ignition mode as using the above three auxiliary spark plugs for ignition.

[0049] The application also passes through a specific use scenario of step S303: considering a sports car equipped with a methanol engine, the driver is enjoying the joy of driving on a mountain road. In such a scenario, the load and driving conditions of the vehicle will change rapidly from low-load cruising to high-load acceleration and then back to medium-load smooth driving, which requires the engine to operate stably and efficiently under different working conditions.

[0050] High-load acceleration working condition: when the driver steps on the accelerator for acceleration, the engine load rises instantaneously, and the system monitors the changes of in-cylinder pressure and temperature. If the system determines that the methanol engine has pre-ignition or knock under the condition of using the main spark plug for ignition (i.e. the re-determination result of step S302), the system will immediately adjust the ignition mode to use three auxiliary spark plugs for ignition (i.e. step S402) to shorten the flame propagation distance, reduce the combustion time, and effectively suppress abnormal combustion. At this time, the final ignition mode is determined to use three auxiliary spark plugs for ignition to ensure the stability and efficiency of the engine under high-load acceleration.

[0051] Smooth driving working condition: when the driver returns to smooth driving, the engine load decreases, and the in-cylinder pressure and temperature monitored by the system are also within the normal range. If the re-determination result at this time represents that the methanol engine does not have the target fault (i.e. the re-determination result of step S302), the system will confirm that the current ignition mode (e.g. using only the main spark plug for ignition) does not need to be modified, and the current ignition mode will be confirmed as the final ignition mode (i.e. step S401). In this way, the system can ensure stable combustion while reducing energy consumption, improving the thermal efficiency and economy of the engine.

[0052] The beneficial effects of one specific use scenario of step S303: Steps S401 and S402 embody the intelligent decision-making capability of the system, which can dynamically adjust the ignition strategy according to the real-time monitoring of the combustion parameters (pressure and temperature), timely respond to and suppress the pre-ignition or knock phenomenon, and ensure the stable operation of the engine under various working conditions; during high-load acceleration, the use of auxiliary spark plugs suppresses abnormal combustion, ensuring that the power output of the engine is not affected, and the driver can enjoy a more stable and powerful driving experience. When driving smoothly, the system uses a more economical ignition method, which helps to improve fuel economy, extend driving range, reduce fuel consumption and emissions; by effectively suppressing pre-ignition and knock, the impact and wear of abnormal combustion on the internal components of the engine are reduced, which helps to extend the service life of the engine and reduce maintenance costs; abnormal combustion phenomena (especially knock) can cause abnormal engine sound and increased vibration, and even damage the engine, affecting vehicle safety. This strategy significantly reduces these risks by intelligently adjusting the ignition method, improving the overall safety of the vehicle.

[0053] As shown in Figure 1 , the new ignition method hardware of the methanol engine is composed of 1 center main spark plug and 3 peripheral auxiliary spark plugs (distributed around the cylinder). The methanol engine control unit adopts different ignition methods according to different working condition operation regions. Specifically as follows: Figure 4

[0054] Starting condition: The methanol engine uses the center main spark plug and the four peripheral auxiliary spark plugs to work together to ignite, to ensure that the methanol engine can be started smoothly, even in extremely cold weather;

[0055] Running condition: Under the running condition of the methanol engine, different ignition methods can be used according to different engine load working condition regions:

[0056] Running condition region 1 (low load condition): The methanol engine uses the center main spark plug and the three peripheral auxiliary spark plugs to work together to ignite, to improve the ignition energy and reduce the engine combustion cycle variation.

[0057] Running condition region 2 (medium load condition): The methanol engine uses the center main spark plug to ignite. In the medium load condition, the in-cylinder temperature is relatively high, which can ensure that only the center main spark plug is used to ignite to achieve efficient operation of the methanol engine.

[0058] Running condition region 3 (high load condition): The methanol engine uses three peripheral spark plugs around the cylinder to ignite. In the high load condition, the in-cylinder temperature is high and pre-ignition and knock are prone to occur. The use of three peripheral spark plugs to ignite at the same time shortens the flame propagation distance, thereby effectively solving the problem of abnormal combustion such as pre-ignition or knock.

[0059] ​The problems of low-temperature cold start and abnormal combustion under high load are effectively solved, which not only improves the combustion stability of the methanol engine, but also effectively solves the reliability problem of the methanol engine.

[0060] In an embodiment of the present application, after determining the final ignition mode, the above method further comprises: determining the number of occurrences of the target fault within a preset time period to obtain a current occurrence number; and adjusting the number of ignitions and / or the ignition time of the methanol engine according to the current occurrence number.

[0061] Wherein, by counting the occurrence frequency of the target fault, the system can more accurately identify which are occasional abnormal combustion events and which are persistent problems. This helps to distinguish between temporary operating condition changes and long-term combustion instability conditions, so as to take more targeted control strategies. If multiple pre-ignition or knock events are detected within a preset time, the system may adjust the number of ignitions or the ignition time, for example, use a more intensive ignition cycle or adjust the ignition advance angle, to adapt to the current combustion condition and reduce the occurrence of abnormal combustion. On the contrary, if the fault rarely occurs, the system may reduce the number of ignitions or fine-tune the ignition time to improve fuel efficiency and reduce energy consumption; frequent occurrence of the target fault may indicate that there are potential problems inside the engine, such as carbon deposition in the combustion chamber, spark plug aging or failure of other components of the combustion system. The system can generate a warning signal to the driver or maintenance personnel according to the number of occurrences of the fault, suggesting inspection or maintenance to prevent more serious faults from occurring.

[0062] In an embodiment of the present application, in the case of only considering pressure, according to the current pressure, determining a judgment result, the judgment result representing whether the methanol engine has the target fault, comprising: in the case that the current pressure is greater than or equal to a pressure threshold, determining that the judgment result represents that the methanol engine has the target fault; in the case that the current pressure is less than the pressure threshold, determining that the judgment result represents that the methanol engine does not have the target fault.

[0063] Wherein, the pressure threshold can be determined according to historical pressure, by real-time monitoring of the pressure in the cylinder, the system can immediately identify the condition of abnormal pressure rise, which is usually an important signal of early combustion or knock. Because the change of pressure is a direct representation of abnormal combustion, this method can provide the fastest and most direct basis for fault judgment, so that the system can respond quickly and avoid the damage that may be caused by abnormal combustion; setting a reasonable pressure threshold can distinguish between pressure changes in normal combustion process and high pressure fluctuations caused by abnormal combustion (early combustion or knock). This method can reduce false positives and false negatives, ensuring the accuracy of fault judgment. Once the pressure exceeds the threshold, the system can determine the occurrence of the target fault, while the pressure below the threshold indicates that the combustion process is within the normal range; based on the fault judgment result of the pressure threshold, the system can automatically adjust the ignition strategy. In the case of early combustion or knock, the system can immediately switch to a safer ignition mode (such as using both the main spark plug and the auxiliary spark plug), while in the normal combustion state, a more efficient ignition mode (such as using only the main spark plug) can be used. This adaptive adjustment capability ensures the optimal state of engine operation under different working conditions.

[0064] In an embodiment of the present application, in the case of only considering temperature, the determination result is determined according to the current temperature, including: in the case that the current temperature is greater than or equal to the temperature threshold, it is determined that the determination result represents that the target fault of the methanol engine occurs; in the case that the current temperature is less than the temperature threshold, it is determined that the determination result represents that the target fault of the methanol engine does not occur.

[0065] Wherein, the temperature threshold can be determined according to historical temperature, temperature is one of the key indicators reflecting the thermodynamic state inside the engine combustion chamber. By setting a suitable temperature threshold, the system can more accurately distinguish between normal combustion temperature and high temperature peaks caused by abnormal combustion (early combustion or knock), reducing the possibility of misjudgment. This real-time monitoring based on temperature threshold provides a more accurate data basis for fault warning; once the current temperature reaches or exceeds the temperature threshold, the system can immediately determine the occurrence of the target fault and trigger the adjustment of the corresponding control strategy, such as switching the ignition mode. The immediate response mechanism helps to quickly suppress abnormal combustion phenomena and prevent further damage to engine performance and internal components; abnormally high temperature often indicates a decrease in combustion efficiency and an increase in heat loss. Through temperature threshold monitoring, the system can actively adjust the ignition strategy, optimize the combustion process, avoid excessive heat loss, and thus improve the overall thermal efficiency of the engine and enhance the fuel economy and power performance of the vehicle.

[0066] In an embodiment of the present application, the determination result is determined according to the current pressure and the current temperature, under the condition of considering the pressure and the temperature simultaneously, including: in the case that the current pressure is greater than or equal to the pressure threshold value, and the current temperature is greater than or equal to the temperature threshold value, it is determined that the determination result represents that the methanol engine has the target fault; in the case that the current pressure is less than the pressure threshold value, and / or the current temperature is less than the temperature threshold value, it is determined that the determination result represents that the methanol engine does not have the target fault.

[0067] Wherein, the combination of current pressure and pressure threshold, current temperature and temperature threshold, and the "and" logic judgment of pre-ignition or knock occurrence can significantly improve the accuracy of fault judgment. This is because abnormal combustion phenomenon is often accompanied by simultaneous abnormal rise of pressure and temperature. The double confirmation mechanism reduces the false positives or false negatives that may be caused by single parameter judgment, ensuring the accuracy of fault identification; this strategy allows the system to monitor the combustion state of the engine (through pressure and temperature) in real time and respond immediately when an anomaly is detected. Immediate response is crucial to suppress pre-ignition and knock, as it can quickly adjust the ignition strategy to prevent abnormal combustion from causing serious damage to the engine; through the comprehensive analysis of pressure and temperature, the system can intelligently distinguish between normal pressure and temperature fluctuations due to changes in workload, or real abnormal combustion events. This intelligent distinction helps the system to adopt the most appropriate control strategy according to different operating conditions (such as starting, accelerating, decelerating or steady driving), ensuring both the efficiency and safety of the engine. Based on the fault judgment of pressure and temperature thresholds, the system can accurately adjust the ignition strategy, such as using multiple spark plugs for ignition under high pressure and high temperature, and using fewer spark plugs under normal or lower combustion pressure and temperature. This not only suppresses abnormal combustion, but also optimizes fuel consumption and improves the overall efficiency of the engine while ensuring stable operation.

[0068] In order to enable those skilled in the art to more clearly understand the technical solutions of the present application, the implementation process of the ignition method of the methanol engine of the present application will be described in detail below in conjunction with specific embodiments.

[0069] The present embodiment relates to a specific ignition method of a methanol engine, as shown in Figure 5 The method comprises the following steps:

[0070] Wherein, the initial ignition mode represents using three auxiliary spark plugs for ignition, and the final ignition mode is one of the following: using three auxiliary spark plugs for ignition, using a main spark plug and three auxiliary spark plugs for ignition, and using a main spark plug for ignition.

[0071] The initial ignition mode represents using three auxiliary spark plugs for ignition.

[0072] obtaining a pressure and / or a temperature of the cylinder at the current time, to obtain a current pressure and / or a current temperature; determining a judgment result according to the current pressure and / or the current temperature, the judgment result representing whether the methanol engine has a target fault, the target fault including at least one of pre-ignition and knocking;

[0073] In a case where the judgment result represents that the methanol engine has the target fault, modifying the initial ignition mode to ignition by the main spark plug and the three auxiliary spark plugs, to determine the final ignition mode as ignition by the main spark plug and the three auxiliary spark plugs;

[0074] In a case where the judgment result represents that the methanol engine does not have the target fault, modifying the initial ignition mode to ignition by the main spark plug, to obtain a current ignition mode, and determining the judgment result again;

[0075] In a case where the determined judgment result represents that the methanol engine does not have the target fault, determining that the current ignition mode does not need to be modified, to determine the final ignition mode as the current ignition mode;

[0076] In a case where the determined judgment result represents that the methanol engine has the target fault, modifying the current ignition mode to ignition by the three auxiliary spark plugs, to determine the final ignition mode as ignition by the three auxiliary spark plugs;

[0077] igniting by the final ignition mode.

[0078] It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described herein can be executed in an order different from that shown herein.

[0079] The embodiment of the present application also provides a methanol engine ignition device. It should be noted that the methanol engine ignition device of the embodiment of the present application can be used to execute the methanol engine ignition method provided by the embodiment of the present application. The device is used to realize the above-mentioned embodiments and preferred embodiments, and will not be described again. As used below, the term "module" can be a combination of software and / or hardware that realizes a predetermined function. Although the device described in the following embodiments is preferably realized in software, hardware, or a combination of software and hardware is also possible and is contemplated.

[0080] The methanol engine ignition device provided by the embodiment of the present application is described below.

[0081] Figure 6 is a structural block diagram of a methanol engine ignition device provided by the embodiment of the present application. AsFigure 6 The device comprises:

[0082] The acquisition unit 61 is configured to acquire the pressure and / or temperature of the cylinder at the current time, to obtain a current pressure and / or a current temperature; the first determination unit 62 is configured to determine a judgment result according to the current pressure and / or the current temperature, wherein the judgment result represents whether the methanol engine has a target fault, and the target fault at least includes one of pre-ignition and knocking; the second determination unit 63 is configured to determine whether to modify an initial ignition mode according to the judgment result, to determine a final ignition mode, and to ignite according to the final ignition mode, wherein the initial ignition mode represents that three auxiliary spark plugs are used for ignition, and the final ignition mode is one of the following: the three auxiliary spark plugs are used for ignition, the main spark plug and the three auxiliary spark plugs are used for ignition, and the main spark plug is used for ignition; the main spark plug is installed at the top center position of the cylinder of the methanol engine, and the three auxiliary spark plugs are arranged around the main spark plug.

[0083] In the device, whether the pre-ignition or the knocking occurs is determined by analyzing the pressure and the temperature at the current time, and according to the judgment result of the fault, the ignition mode can be intelligently adjusted. If the potential pre-ignition or the knocking is detected, the system will be adjusted from the initial ignition mode (only using the auxiliary spark plug for ignition) to the ignition mode using more spark plugs, such as using the main spark plug and all auxiliary spark plugs at the same time, or using only the main spark plug for ignition, to reduce the instability in the combustion process and inhibit the occurrence of abnormal combustion. Once the final ignition mode is determined, the system will perform ignition according to the mode, so as to effectively control the pre-ignition, the knocking and other faults without sacrificing the engine performance, avoid the too conservative ignition strategy in the traditional method, make the methanol engine also achieve high thermal efficiency and power performance under high load conditions, reduce the mechanical stress inside the engine, and prolong the service life of the engine, thereby solving the problem that the existing scheme is difficult to inhibit the pre-ignition and the knocking of the methanol engine during the ignition period.

[0084] In an embodiment of the present application, the second determining unit comprises: a first processing module configured to modify the initial ignition mode to ignition by the main spark plug and the three auxiliary spark plugs to determine the final ignition mode as ignition by the main spark plug and the three auxiliary spark plugs in the case where the judgment result indicates that the methanol engine has the target fault; a second processing module configured to modify the initial ignition mode to ignition by the main spark plug to obtain a current ignition mode and determine the judgment result again in the case where the judgment result indicates that the methanol engine does not have the target fault; and a third processing module configured to determine whether to modify the current ignition mode according to the determined judgment result again to determine the final ignition mode.

[0085] In a low-temperature environment, using all four spark plugs for ignition significantly improves the success rate of starting and reduces the risk of starting failure or delay; in a high-load working condition, the intelligent control strategy is used to adjust the ignition mode in real time, effectively inhibiting the phenomenon of pre-ignition and knocking, improving the stability and efficiency of combustion, and protecting the engine from damage caused by abnormal combustion; by dynamically selecting the most suitable ignition mode, unnecessary energy waste is avoided, and the thermal efficiency and overall energy efficiency of the methanol engine are improved, thereby saving fuel and reducing emissions; the stable and reliable starting and abnormal combustion-free running state not only ensures the power performance of the automobile, but also reduces the vibration and noise of the engine, thereby improving the comfort and satisfaction of the driver.

[0086] In an embodiment of the present application, the third processing module comprises: a first processing submodule configured to determine that the current ignition mode does not need to be modified to determine the final ignition mode as the current ignition mode in the case where the determined judgment result indicates that the methanol engine does not have the target fault; and a second processing submodule configured to modify the current ignition mode to ignition by the three auxiliary spark plugs to determine the final ignition mode as ignition by the three auxiliary spark plugs in the case where the determined judgment result indicates that the methanol engine has the target fault.

[0087] During high-load acceleration, the use of auxiliary spark plugs helps suppress abnormal combustion, ensuring that the engine's power output is not affected, and the driver can enjoy a smoother and more powerful driving experience. During steady driving, the system uses a more economical ignition method, which helps improve fuel economy, extend driving range, reduce fuel consumption and emissions; by effectively suppressing pre-ignition and knocking, the impact and wear of abnormal combustion on engine internal components are reduced, which helps to extend the service life of the engine and reduce maintenance costs; abnormal combustion phenomena (especially knocking) can cause engine noise and vibration to increase, and even damage the engine, affecting vehicle safety. This strategy significantly reduces these risks by intelligently adjusting the ignition method, improving the overall safety of the vehicle.

[0088] In an embodiment of the present application, the device further comprises: a first processing unit for determining the number of occurrences of the target fault within a predetermined time period after determining the final ignition mode, obtaining a current occurrence number; a second processing unit for adjusting the number of ignitions and / or the ignition time of the methanol engine according to the current occurrence number.

[0089] Wherein, by counting the occurrence frequency of the target fault, the system can more accurately identify which are occasional abnormal combustion events and which are persistent problems. This helps to distinguish between temporary operating condition changes and long-term combustion instability conditions, so that more targeted control strategies can be adopted. If multiple pre-ignition or knocking events are detected within a predetermined time, the system may adjust the number of ignitions or the ignition time, such as using a more intensive ignition cycle or adjusting the ignition advance angle, to adapt to the current combustion conditions and reduce the occurrence of abnormal combustion. Conversely, if the fault occurs rarely, the system may reduce the number of ignitions or fine-tune the ignition time to improve fuel efficiency and reduce energy consumption; frequent occurrence of the target fault may indicate that there are potential problems inside the engine, such as carbon deposition in the combustion chamber, spark plug aging or failure of other components of the combustion system. The system can generate a warning signal to the driver or maintenance personnel according to the number of occurrences of the fault, suggesting inspection or maintenance to prevent more serious faults from occurring.

[0090] In an embodiment of the present application, in the case of only considering pressure, the second processing unit comprises: a fourth processing module for determining that the judgment result represents that the methanol engine has the target fault when the current pressure is greater than or equal to the pressure threshold; a fifth processing module for determining that the judgment result represents that the methanol engine does not have the target fault when the current pressure is less than the pressure threshold.

[0091] Wherein, the pressure threshold value can be determined according to the historical pressure. By monitoring the pressure in the cylinder in real time, the system can immediately identify the condition of abnormal pressure rise, which is usually an important signal of pre-ignition or knock. Since the change in pressure is a direct representation of abnormal combustion, this method can provide the fastest and most direct basis for fault judgment, enabling the system to respond quickly and avoid the damage that may be caused by abnormal combustion; By setting a reasonable pressure threshold value, the pressure changes during normal combustion and the high pressure fluctuations caused by abnormal combustion (pre-ignition or knock) can be distinguished. This method can reduce false positives and false negatives, ensuring the accuracy of fault judgment. Once the pressure exceeds the threshold value, the system can determine the occurrence of the target fault, while the pressure below the threshold value indicates that the combustion process is within the normal range; Based on the fault judgment result of the pressure threshold value, the system can automatically adjust the ignition strategy. In the case of pre-ignition or knock, the system can immediately switch to a safer ignition mode (such as using both the main spark plug and the auxiliary spark plug), while in the case of normal combustion, a more efficient ignition mode (such as using only the main spark plug) can be used. This adaptive adjustment capability ensures the optimal state of engine operation under different operating conditions.

[0092] In an embodiment of the present application, in the case of only considering temperature, the second processing unit comprises: a sixth processing module for determining that the judgment result represents that the methanol engine has the target fault in the case that the current temperature is greater than or equal to the temperature threshold value; and a seventh processing module for determining that the judgment result represents that the methanol engine does not have the target fault in the case that the current temperature is less than the temperature threshold value.

[0093] Wherein, the temperature threshold value can be determined according to the historical temperature. Temperature is one of the key indicators reflecting the thermodynamic state inside the engine combustion chamber. By setting a suitable temperature threshold value, the system can more accurately distinguish between normal combustion temperature and high temperature peaks caused by abnormal combustion (pre-ignition or knock), reducing the possibility of misjudgment. This real-time monitoring based on temperature threshold provides a more accurate data basis for fault warning; Once the current temperature reaches or exceeds the temperature threshold, the system can immediately determine the occurrence of the target fault and trigger the adjustment of the corresponding control strategy, such as switching the ignition mode. The immediate response mechanism helps to quickly suppress abnormal combustion phenomena and prevent further damage to engine performance and internal components; Abnormally high temperature often indicates a decrease in combustion efficiency and an increase in heat loss. Through temperature threshold monitoring, the system can actively adjust the ignition strategy, optimize the combustion process, avoid excessive heat loss, and thus improve the overall thermal efficiency of the engine and enhance the fuel economy and power performance of the vehicle.

[0094] In an embodiment of the present application, the second processing unit comprises an eighth processing module for determining that the judgment result represents that the methanol engine has the target fault when the current pressure is greater than or equal to the pressure threshold and the current temperature is greater than or equal to the temperature threshold, and a ninth processing module for determining that the judgment result represents that the methanol engine does not have the target fault when the current pressure is less than the pressure threshold and / or the current temperature is less than the temperature threshold.

[0095] Where the current pressure and pressure threshold, current temperature and temperature threshold are combined, and the "and" logic is used to determine the occurrence of pre-ignition or knock, the accuracy of fault judgment can be significantly improved. This is because abnormal combustion is often accompanied by simultaneous abnormal rise in pressure and temperature. The double confirmation mechanism reduces the false positives or false negatives that may be caused by single parameter judgment, ensuring the accuracy of fault identification; this strategy allows the system to monitor the engine's combustion state (through pressure and temperature) in real time and respond immediately when an anomaly is detected. Immediate response is crucial in suppressing pre-ignition and knock, as it can quickly adjust the ignition strategy to prevent abnormal combustion from causing serious damage to the engine; through the comprehensive analysis of pressure and temperature, the system can intelligently distinguish between normal pressure and temperature fluctuations due to changes in workload, or real abnormal combustion events. This intelligent distinction helps the system to adopt the most appropriate control strategy according to different operating conditions (such as starting, accelerating, decelerating or steady driving), ensuring both the efficiency and safety of the engine. Based on the pressure and temperature threshold fault judgment, the system can accurately adjust the ignition strategy, such as using multiple spark plugs for ignition under high pressure and high temperature, and using fewer spark plugs under normal or lower combustion pressure and temperature. This not only suppresses abnormal combustion, but also optimizes fuel consumption and improves the overall efficiency of the engine while ensuring stable operation.

[0096] The ignition device of the methanol engine includes a processor and a memory, and the acquisition unit, the first determination unit, the second determination unit, etc. are stored in the memory as program units, and the corresponding functions are realized by the processor executing the program units stored in the memory. The above-mentioned modules are located in the same processor; or, each of the above-mentioned modules is located in a different processor in any combination.

[0097] The processor contains a core, and the core retrieves the corresponding program unit from the memory. The core can be set to one or more, and the problem that the existing scheme is difficult to suppress the pre-ignition and knock phenomenon of the methanol engine during the ignition period can be solved by adjusting the core parameters.

[0098] The memory can include non-persistent memory in a computer readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash memory, including at least one memory chip.

[0099] The embodiment of the present application provides a computer readable storage medium, which comprises a stored program, wherein the program controls a device where the computer readable storage medium is located to perform the ignition method of the methanol engine when the program runs.

[0100] The embodiment of the present application provides a processor, which is used for running a program, wherein the program performs the ignition method of the methanol engine when the program runs.

[0101] The embodiment of the present application provides a device, which comprises a processor, a memory and a program stored in the memory and capable of running on the processor, and the processor performs the following steps when the program runs: obtaining a pressure and / or a temperature of a cylinder at a current time, to obtain a current pressure and / or a current temperature; determining a judgment result according to the current pressure and / or the current temperature, wherein the judgment result represents whether a target fault of the methanol engine occurs, and the target fault at least includes one of pre-ignition and knock; determining whether to modify an initial ignition mode according to the judgment result, to determine a final ignition mode, and igniting in the final ignition mode, wherein the initial ignition mode represents ignition by the three auxiliary spark plugs, and the final ignition mode is one of ignition by the three auxiliary spark plugs, ignition by the main spark plug and the three auxiliary spark plugs, and ignition by the main spark plug. The device can be a server, a PC, a PAD, a mobile phone or the like.

[0102] The present application also provides a computer program product, which is suitable for executing a program with at least the following method steps when executed on a data processing device: obtaining a pressure and / or a temperature of a cylinder at a current time, to obtain a current pressure and / or a current temperature; determining a judgment result according to the current pressure and / or the current temperature, wherein the judgment result represents whether a target fault of the methanol engine occurs, and the target fault at least includes one of pre-ignition and knock; determining whether to modify an initial ignition mode according to the judgment result, to determine a final ignition mode, and igniting in the final ignition mode, wherein the initial ignition mode represents ignition by the three auxiliary spark plugs, and the final ignition mode is one of ignition by the three auxiliary spark plugs, ignition by the main spark plug and the three auxiliary spark plugs, and ignition by the main spark plug.

[0103] The application also provides a methanol engine system, which comprises a controller, one main spark plug and three auxiliary spark plugs, the main spark plug is installed at the top center of the cylinder of the methanol engine, the three auxiliary spark plugs are arranged around the main spark plug, and the controller is used to execute any one of the above methods. By analyzing the pressure and temperature at the current time to determine whether pre-ignition or knock occurs, according to the judgment result of the fault, the ignition mode can be intelligently adjusted, if potential pre-ignition or knock is detected, the system will be adjusted from the initial ignition mode (only using auxiliary spark plug ignition) to the ignition mode using more spark plugs, such as using the main spark plug and all auxiliary spark plugs at the same time, or only using the main spark plug to ignite, so as to reduce the instability in the combustion process and inhibit the occurrence of abnormal combustion phenomenon, once the final ignition mode is determined, the system will execute ignition according to the mode, thereby effectively controlling the pre-ignition, knock and other faults without sacrificing the performance of the engine, avoiding the too conservative ignition strategy in the traditional method, so that the methanol engine can also achieve high thermal efficiency and power performance under high load conditions, reducing the mechanical stress inside the engine and prolonging the service life of the engine, thereby solving the problem that the prior art is difficult to inhibit the pre-ignition and knock of the methanol engine during the ignition period.

[0104] Obviously, those skilled in the art should understand that the modules or steps of the present application described above can be realized by general computing devices, which can be concentrated on a single computing device or distributed on a network composed of multiple computing devices, and can be realized by program codes executable by the computing devices, so that they can be stored in storage devices and executed by the computing devices, and in some cases, the steps shown or described can be executed in different order, or they can be manufactured into individual integrated circuit modules or multiple modules or steps into a single integrated circuit module. Therefore, the present application is not limited to any specific combination of hardware and software.

[0105] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system or a computer program product. Therefore, the present application can be in the form of a complete hardware embodiment, a complete software embodiment or an embodiment combining software and hardware aspects. Moreover, the present application can be in the form of a computer program product implemented on one or more computer usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer usable program codes.

[0106] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more flow or blocks Figure 1 means for functionally implementing the steps listed in the flowchart block or blocks.

[0107] These computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture including instructions which implement the function specified in the flowchart block or blocks. Figure 1 one or more flow or blocks Figure 1 means for functionally implementing the steps listed in the flowchart block or blocks.

[0108] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more flow or blocks Figure 1 means for functionally implementing the steps listed in the flowchart block or blocks.

[0109] In one typical configuration, the computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0110] The memory can include non-persistent memory and / or volatile memory, such as random access memory (RAM) and / or cache memory, for storing instructions and data used and / or generated by the computing device. The memory can also include non-volatile memory, such as read-only memory (ROM), electrically programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), flash memory, or nonvolatile random access memory (RAM) (e.g., fault tolerant RAM), for storing instructions and data used and / or generated by the computing device. The memory is an example of computer readable media.

[0111] Computer-readable media includes permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology for information storage. Information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette, magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information accessible to a computing device. According to the definition herein, computer-readable media does not include transitory media such as modulated data signals and carriers.

[0112] It should also be noted that the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that processes, methods, articles or devices including a series of elements not only include those elements, but also include other elements not explicitly listed or inherent to such processes, methods, articles or devices. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the process, method, article or device including the element.

[0113] From the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects:

[0114] 1) The ignition method of the methanol engine of the present application determines whether pre-ignition or knock occurs by analyzing the pressure and temperature at the current time, and intelligently adjusts the ignition mode according to the fault judgment result. If potential pre-ignition or knock is detected, the system will adjust from the initial ignition mode (using only the auxiliary spark plug to ignite) to the ignition mode using more spark plugs, such as using the main spark plug and all auxiliary spark plugs at the same time, or using only the main spark plug to ignite, to reduce the instability in the combustion process and suppress the occurrence of abnormal combustion phenomena. Once the final ignition mode is determined, the system will perform ignition according to the mode, thereby effectively controlling pre-ignition, knock and other faults without sacrificing engine performance, avoiding the overly conservative ignition strategy in traditional methods, enabling the methanol engine to achieve high thermal efficiency and power performance under high load conditions, reducing mechanical stress inside the engine, and prolonging the service life of the engine, thereby solving the problem that existing solutions are difficult to suppress pre-ignition and knock phenomena of methanol engines during the ignition period.

[0115] 2), The ignition device of the methanol engine of the present application determines whether pre-ignition or knock occurs by analyzing the pressure and temperature at the current time, and intelligently adjusts the ignition mode according to the fault judgment result. If potential pre-ignition or knock is detected, the system will adjust from the initial ignition mode (only using auxiliary spark plug ignition) to the ignition mode using more spark plugs, such as using the main spark plug and all auxiliary spark plugs at the same time, or only using the main spark plug to ignite, in order to reduce the instability in the combustion process and inhibit the occurrence of abnormal combustion phenomenon. Once the final ignition mode is determined, the system will perform ignition according to this mode, thereby effectively controlling pre-ignition, knock and other faults without sacrificing engine performance, avoiding the overly conservative ignition strategy in the traditional method, enabling the methanol engine to achieve high thermal efficiency and power performance under high load conditions, reducing the mechanical stress inside the engine and prolonging the service life of the engine, thereby solving the problem that the existing scheme is difficult to inhibit the occurrence of pre-ignition and knock in the ignition period of the methanol engine.

[0116] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Those skilled in the art can make various changes and modifications to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method of igniting a methanol engine, applied to a controller in a methanol engine system, the methanol engine system further comprising a main spark plug and three auxiliary spark plugs, the main spark plug being installed to a top center position of a cylinder of the methanol engine, the three auxiliary spark plugs being disposed around the main spark plug, characterized in that, The method comprises: obtaining the pressure and / or temperature of the cylinder at the current time, to obtain a current pressure and / or a current temperature; determining a judgment result according to the current pressure and / or the current temperature, the judgment result representing whether the methanol engine has a target fault, the target fault including at least one of pre-ignition and knocking; determining whether to modify an initial ignition mode according to the judgment result to determine a final ignition mode, and igniting according to the final ignition mode, the initial ignition mode representing ignition by the three auxiliary spark plugs, and the final ignition mode being one of ignition by the three auxiliary spark plugs, ignition by the main spark plug and the three auxiliary spark plugs, and ignition by the main spark plug; determining whether to modify the initial ignition mode according to the judgment result to determine the final ignition mode, including: in a case where the judgment result represents that the methanol engine has the target fault, modifying the initial ignition mode to ignition by the main spark plug and the three auxiliary spark plugs to determine the final ignition mode as ignition by the main spark plug and the three auxiliary spark plugs; in a case where the judgment result represents that the methanol engine does not have the target fault, modifying the initial ignition mode to ignition by the main spark plug to obtain a current ignition mode, and determining the judgment result again; and determining whether to modify the current ignition mode according to the judgment result determined again to determine the final ignition mode; determining whether to modify the current ignition mode according to the judgment result determined again to determine the final ignition mode, including: in a case where the judgment result determined again represents that the methanol engine does not have the target fault, determining that the current ignition mode does not need to be modified to determine the final ignition mode as the current ignition mode; and in a case where the judgment result determined again represents that the methanol engine has the target fault, modifying the current ignition mode to ignition by the three auxiliary spark plugs to determine the final ignition mode as ignition by the three auxiliary spark plugs.

2. The method of claim 1, wherein, After determining the final ignition mode, the method further comprises: determining a current number of occurrences of the target fault in a preset time period; adjusting the number of ignitions and / or the ignition time of the methanol engine according to the current number of occurrences.

3. The method of claim 1, wherein, determining a judgment result according to the current pressure, the judgment result representing whether the methanol engine has a target fault, including: in a case where the current pressure is greater than or equal to a pressure threshold, determining that the judgment result represents that the methanol engine has the target fault; and in a case where the current pressure is less than the pressure threshold, determining that the judgment result represents that the methanol engine does not have the target fault.

4. The method of claim 1, wherein, determining a judgment result according to the current temperature, including: In a case where the current temperature is greater than or equal to a temperature threshold, it is determined that the determination result represents that the methanol engine has the target fault; In a case where the current temperature is less than the temperature threshold, it is determined that the determination result represents that the methanol engine does not have the target fault.

5. The method of claim 1, wherein, According to the current pressure and the current temperature, a determination result is determined, including: In a case where the current pressure is greater than or equal to a pressure threshold, and the current temperature is greater than or equal to a temperature threshold, it is determined that the determination result represents that the methanol engine has the target fault; In a case where the current pressure is less than the pressure threshold, and / or, the current temperature is less than the temperature threshold, it is determined that the determination result represents that the methanol engine does not have the target fault.

6. An ignition device for a methanol engine, characterized by Including: An acquisition unit is configured to acquire a pressure and / or a temperature of a cylinder at a current time, to obtain a current pressure and / or a current temperature; A first determination unit is configured to determine a determination result according to the current pressure and / or the current temperature, the determination result representing whether a methanol engine has a target fault, the target fault including at least one of pre-ignition and knock; A second determination unit is configured to determine whether to modify an initial ignition mode to determine a final ignition mode according to the determination result, and to ignite according to the final ignition mode, wherein the initial ignition mode represents that three auxiliary spark plugs are used for ignition, and the final ignition mode is one of the following: the three auxiliary spark plugs are used for ignition, a main spark plug and the three auxiliary spark plugs are used for ignition, and the main spark plug is used for ignition, the main spark plug is installed at a top center position of a cylinder of the methanol engine, and the three auxiliary spark plugs are arranged around the main spark plug; The second determination unit includes: a first processing module configured to modify the initial ignition mode to ignition by the main spark plug and the three auxiliary spark plugs to determine the final ignition mode as ignition by the main spark plug and the three auxiliary spark plugs in a case where the determination result represents that the methanol engine has the target fault; a second processing module configured to modify the initial ignition mode to ignition by the main spark plug to obtain a current ignition mode and to determine the determination result again in a case where the determination result represents that the methanol engine does not have the target fault; and a third processing module configured to determine whether to modify the current ignition mode to determine the final ignition mode according to the determination result determined again. The third processing module comprises: a first processing submodule for determining that the current ignition mode does not need to be modified and determining the final ignition mode as the current ignition mode in a case that the re-determined judgment result represents that the methanol engine does not occur the target fault; and a second processing submodule for modifying the current ignition mode to ignition by the three auxiliary spark plugs and determining the final ignition mode as ignition by the three auxiliary spark plugs in a case that the re-determined judgment result represents that the methanol engine occurs the target fault.

7. A computer readable storage medium characterized by The computer readable storage medium comprises a stored program, wherein the program controls a device where the computer readable storage medium is located to execute the method in any one of claims 1 to 5 when the program is running.

8. A methanol engine system characterized by, The computer readable storage medium comprises a stored program, wherein the program controls a device where the computer readable storage medium is located to execute the method in any one of claims 1 to 5 when the program is running. The controller, the main spark plug and the three auxiliary spark plugs, the main spark plug is installed to the top center position of the cylinder of the methanol engine, the three auxiliary spark plugs are arranged around the main spark plug, and the controller is used for executing the method in any one of claims 1 to 5.

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