A method for controlling backfire of a hydrogen engine

Abstract

This application relates to the technical field of combustion engines, and particularly to a method for controlling backfire of a hydrogen engine. An intake manifold and variable valves are provided in the engine. The method includes determining whether there is backfire in the engine; when the determination result is yes, adjusting the angle of the variable valve to a window angle, and then adjusting the angle of the variable valve to a target angle to enable the engine to continue operating; when the determination result is no, controlling the angle of the variable valve to a working angle. Through the method provided by this application, the backfire problem of the hydrogen engine can be judged and controlled in a timely and accurate manner, protecting the internal components of the engine from damage, increasing the service life of the engine, thereby reducing the vehicle maintenance cost and improving the safety of road driving.

Description

Technical Field

[0001] The present application relates to the technical field of combustion engines, and in particular to a hydrogen engine backfire control method. Background Art

[0002] Hydrogen energy is a common type of new energy. Due to its own characteristics, hydrogen energy has many advantages over traditional energy sources. For example, hydrogen does not produce CO2 emissions after combustion. However, due to the high activity of hydrogen and the wide flammability boundary, when a hydrogen engine is working, hydrogen easily enters the intake manifold from the cylinder and burns, causing damage to the intake manifold and other parts. This phenomenon is referred to as backfire. Backfire causes automobile engine failures, reduces engine service life, increases maintenance costs, and also creates safety hazards for road safety. How to overcome the backfire problem is a key and difficult point in the field of hydrogen engines. Summary of the invention

[0003] In order to control the backfire phenomenon of hydrogen engines, protect the internal components of the engine from damage, increase the service life of the engine, reduce vehicle maintenance costs, and improve road safety,

[0004] In a first aspect, the present application provides a method for controlling backfire in a hydrogen engine, wherein the engine is provided with an intake manifold and a variable valve, and the method comprises:

[0005] Determining whether the engine has backfire;

[0006] When the judgment result is yes, adjusting the angle of the variable valve to the window angle, and then adjusting the angle of the variable valve to the target angle, so that the engine continues to work;

[0007] When the judgment result is no, the angle of the variable valve is controlled to be a working angle.

[0008] Further, the determining whether the engine has backfire includes:

[0009] monitoring the real-time temperature of the intake manifold, and determining that backfire occurs in the engine when the real-time temperature is greater than a preset temperature threshold;

[0010] The temperature threshold is determined according to the speed and load of the engine.

[0011] Further, the adjusting the angle of the variable valve to the window angle, and then adjusting the angle of the variable valve to the target angle includes:

[0012] adjusting the angle of the variable valve to a window angle;

[0013] Acquire the maximum angle allowed by the variable valve during backfire as a target angle;

[0014] The angle of the variable valve is adjusted to a target angle.

[0015] Further, the maximum angle allowed by the variable valve during backfire is obtained as a target angle, including:

[0016] Based on the speed and load of the engine and the angle of the variable valve change when the historical backfire occurs, the maximum angle allowed when the variable valve backfires is calculated as the target angle.

[0017] Furthermore, the target angle is obtained through a learning model.

[0018] In a second aspect, the present application provides a hydrogen engine flashback control system, wherein the engine is provided with an intake manifold and a variable valve, and the system comprises:

[0019] The first module determines whether the engine has backfire;

[0020] The second module, when the judgment result is yes, adjusts the angle of the variable valve to the window angle, and then adjusts the angle of the variable valve to the target angle, so that the engine continues to work;

[0021] The third module, when the judgment result is no, controls the angle of the variable valve to be a working angle.

[0022] Further, the first module determines whether the engine has backfire, including:

[0023] monitoring the real-time temperature of the intake manifold, and determining that backfire occurs in the engine when the real-time temperature is greater than a preset temperature threshold;

[0024] The temperature threshold is determined according to the speed and load of the engine.

[0025] Further, the second module adjusts the angle of the variable valve to a window angle, and then adjusts the angle of the variable valve to a target angle, including:

[0026] adjusting the angle of the variable valve to a window angle;

[0027] Acquire the maximum angle allowed by the variable valve during backfire as a target angle;

[0028] The angle of the variable valve is adjusted to a target angle.

[0029] In a third aspect, the present application provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the method steps described in any one of the first aspects are implemented.

[0030] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements any of the method steps described in the first aspect.

[0031] Beneficial effects:

[0032] Through the method provided by the present application, firstly, whether the engine has backfire is timely and accurately judged; when it is judged that backfire exists, the angle of the variable valve is adjusted to the window angle, which is the minimum angle for the engine to remain in the working state. When the engine works at the window angle, it can protect the internal components of the engine from damage due to hydrogen combustion during backfire; then the angle of the variable valve is adjusted to the target angle to make the engine continue to work; when it is judged that there is no backfire, the angle of the variable valve is controlled to the working angle to improve the working performance of the engine. Through the method provided by the present application, the backfire problem of the hydrogen engine is timely and accurately judged and controlled, the internal components of the engine are protected from damage, and the service life of the engine is increased, thereby reducing the maintenance cost of the vehicle and improving the safety of road driving. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 It is a schematic diagram of the method flow provided in Example 1 of the present application;

[0035] Figure 2 This is a schematic diagram of the electronic structure equipment in Example 4 of the present application. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0037] Example 1

[0038] Embodiment 1 provides a hydrogen engine backfire control method, wherein the engine is provided with an intake manifold and a variable valve VVT, and the engine is connected to an energy management system EMS.

[0039] Combined with Figure 1 , the method mainly comprises the following steps:

[0040] S1, determining whether the engine has backfire;

[0041] S2, when the judgment result is yes, adjusting the angle of the variable valve to the window angle, and then adjusting the angle of the variable valve to the target angle, so that the engine continues to work;

[0042] S3: When the judgment result is no, adjusting the angle of the variable valve to a working angle.

[0043] The following is a detailed description of the present invention in conjunction with specific implementation methods:

[0044] Execute step S1 to determine whether the engine has backfire;

[0045] Specifically include:

[0046] The engine speed and load are obtained through the energy management system EMS, and the temperature threshold T corresponding to the engine speed and load is determined according to the engine speed and load and compared with the industry standard of engine operation, for example, by a three-dimensional table lookup method;

[0047] The energy management system EMS monitors the real-time temperature of the intake manifold in real time, and when the real-time temperature t is greater than a preset temperature threshold T, it is determined that the engine has backfire;

[0048] When the judgment result is no, the angle of the variable valve is maintained at the working angle D;

[0049] Executing step S2, when the judgment result is yes, adjusting the angle of the variable valve to the window angle, and then adjusting the angle of the variable valve to the target angle, so that the engine continues to work;

[0050] Specifically include:

[0051] Since hydrogen is highly reactive and has a wide flammable boundary, when hydrogen enters the intake manifold from the cylinder and burns, backfire occurs. At this time, the real-time temperature t is greater than the preset temperature threshold T, which can easily cause damage to the intake manifold. Therefore, the angle of the variable valve should be set to the window angle immediately. The window angle is the critical angle of the variable valve. At this angle, the engine will not shut down, and hydrogen can be prevented from entering and damaging the manifold to the greatest extent.

[0052] However, at the window angle, the engine's working efficiency is extremely low, causing the hydrogen fuel vehicle to be underpowered, affecting normal driving and reducing user experience;

[0053] The energy control system EMS calculates the corresponding working angle D according to the engine speed and load;

[0054] The learning model calculates the maximum allowable angle of the variable valve as the target angle d according to the engine speed and load, and the historical parameters of the system's adjustment of the variable valve angle when the historical backfire occurs;

[0055] Controlling the angle of the variable valve to a target angle d;

[0056] Executing step S3, when the judgment result is no, adjusting the angle of the variable valve to a working angle;

[0057] Specifically include:

[0058] The energy control system EMS continuously monitors the real-time temperature t of the intake manifold;

[0059] When the real-time temperature t is less than a preset temperature threshold T, it is determined that there is no backfire in the engine;

[0060] When there is no backfire in the engine, the angle of the variable valve is adjusted to the working angle D to improve the engine working performance;

[0061] Steps S1-S3 are repeatedly performed to prevent the hydrogen engine from backfired and causing damage to the engine.

[0062] Through the method provided in Example 1, firstly, whether the engine has backfire is timely and accurately judged; when it is judged that backfire exists, the angle of the variable valve is adjusted to the window angle, which is the minimum angle for the engine to remain in the working state. The engine works at the window angle, which can protect the internal components of the engine from damage due to hydrogen combustion during backfire; then the angle of the variable valve is adjusted to the target angle to keep the engine working; when it is judged that there is no backfire, the angle of the variable valve is controlled to the working angle to improve the working performance of the engine. Through the method provided in this application, the backfire problem of the hydrogen engine is timely and accurately judged and controlled, the internal components of the engine are protected from damage, and the service life of the engine is increased, thereby reducing the vehicle maintenance cost and improving the safety of road driving.

[0063] Example 2

[0064] Based on the same inventive concept, Example 2 also proposes a hydrogen engine flashback control method, and the specific implementation steps are as follows:

[0065] The energy control system EMS obtains the speed and load of the engine, and based on the engine speed and load, obtains the temperature threshold T and the working intake variable valve angle X and the working exhaust variable valve angle Y;

[0066] The energy control system EMS obtains the measured temperature t of the intake manifold and determines whether t>T is satisfied;

[0067] When the judgment result is yes, the intake variable valve angle and the target exhaust variable valve angle are both adjusted to corresponding window angles as reference positions;

[0068] The learning model calculates and obtains the deflection angle a by which the working intake variable valve angle X should be reduced and the deflection angle b by which the working exhaust variable valve angle Y should be reduced when backfire occurs, based on the engine speed and load, and the historical parameters of the system's adjustment of the variable valve angle when historical backfire occurred. Then, the target intake variable valve angle X = x - a, and the target exhaust variable valve angle Y = y - b. The intake variable valve angle is adjusted to the target intake variable valve angle X, and the exhaust variable valve angle is adjusted to the target intake variable valve angle Y;

[0069] When it is determined that t < T, the backfire disappears, and the intake variable valve angle is adjusted to the working intake variable valve angle x, and the exhaust variable valve angle is adjusted to the working intake variable valve angle y.

[0070] Embodiment 3

[0071] Based on the same inventive concept, Embodiment 3 of the present application provides a hydrogen engine backfire control system, and the system includes:

[0072] A first module for determining whether there is backfire in the engine;

[0073] Specifically,

[0074] The first module monitors the real-time temperature of the intake manifold. When the real-time temperature is greater than a preset temperature threshold, it is determined that there is backfire in the engine;

[0075] The temperature threshold is determined according to the engine speed and load.

[0076] A second module, when the judgment result is yes, adjusts the angle of the variable valve to the window angle, and then adjusts the angle of the variable valve to the target angle to keep the engine running continuously;

[0077] Specifically,

[0078] The second module adjusts the angle of the variable valve to the window angle;

[0079] Obtains the maximum allowable angle of the variable valve during backfire as the target angle;

[0080] Adjusts the angle of the variable valve to the target angle.

[0081] A third module, when the judgment result is no, adjusts the angle of the variable valve to the working angle.

[0082] Embodiment 4

[0083] Based on the same inventive concept, Embodiment 4 of the present application provides an electronic device, as shown in the appendix Figure 2As shown, it includes a memory 304, a processor 302, and a computer program stored in the memory 304 and executable on the processor 302. When the processor 302 executes the program, the steps of the above-mentioned hydrogen engine backfire control method are implemented.

[0084] Among them, Figure 2 In the embodiment of the present invention, a bus architecture (represented by bus 300) is shown, which may include any number of interconnected buses and bridges, and bus 300 links various circuits including one or more processors represented by processor 302 and memory represented by memory 304. Bus 300 may also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and are therefore not further described herein. Bus interface 306 provides an interface between bus 300 and receiver 301 and transmitter 303. Receiver 301 and transmitter 303 may be the same element, namely a transceiver, providing a unit for communicating with various other devices over a transmission medium. Processor 302 is responsible for managing bus 300 and general processing, while memory 304 may be used to store data used by processor 302 when performing operations.

[0085] Example 5

[0086] Based on the same inventive concept, embodiment 5 of the present invention provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the steps of the above-mentioned hydrogen engine backfire control method are implemented.

[0087] The algorithm and display provided herein are not inherently related to any particular computer, virtual system or other device. Various general purpose systems can also be used together with the teachings based on this. According to the above description, it is obvious that the structure required for constructing such systems. In addition, the present invention is not directed to any specific programming language either. It should be understood that various programming languages ​​can be utilized to realize the content of the present invention described herein, and the description of the above specific languages ​​is for disclosing the best mode of the present invention.

[0088] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0089] Similarly, it should be understood that in order to streamline the present disclosure and aid in understanding one or more of the various inventive aspects, in the above description of exemplary embodiments of the present invention, various features of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed method should not be interpreted as reflecting the intention that the claimed invention requires more features than those explicitly recited in each claim. More specifically, as reflected in the claims below, inventive aspects lie in less than all the features of the individual embodiments disclosed above. Therefore, the claims that follow the specific embodiment are hereby expressly incorporated into the specific embodiment, with each claim itself serving as a separate embodiment of the present invention.

[0090] Those skilled in the art will appreciate that the modules in the devices in the embodiments may be adaptively changed and arranged in one or more devices different from the embodiments. The modules or units or components in the embodiments may be combined into one module or unit or component, and in addition they may be divided into a plurality of submodules or subunits or subcomponents. Except that at least some of such features and / or processes or units are mutually exclusive, all features disclosed in this specification (including the accompanying claims, abstracts and drawings) and all processes or units of any method or device disclosed in this manner may be combined in any combination. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstracts and drawings) may be replaced by an alternative feature providing the same, equivalent or similar purpose.

[0091] In addition, those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, in the claims below, any one of the claimed embodiments may be used in any combination.

[0092] The various component embodiments of the present invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. It should be understood by those skilled in the art that a microprocessor or digital signal processor (DSP) may be used in practice to implement some or all functions of some or all components in an electronic device according to an embodiment of the present invention. The present invention may also be implemented as a device or apparatus program (e.g., a computer program and a computer program product) for executing part or all of the methods described herein. Such a program implementing the present invention may be stored on a computer-readable medium, or may have the form of one or more signals. Such a signal may be downloaded from an Internet website, or provided on a carrier signal, or provided in any other form.

[0093] The above is only an embodiment of the present application. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for the technicians in this field, without departing from the structure of this application, several deformations and improvements can be made, which should also be regarded as the scope of protection of this application, which will not affect the effect of the implementation of this application and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to explain the content of the claims.

Claims

1. A method for controlling flashback of a hydrogen engine, wherein the engine is provided with an intake manifold and a variable valve. It is characterized in that The method comprises, Determining whether the engine has backfire; When the judgment result is yes, adjusting the angle of the variable valve to the window angle, and then adjusting the angle of the variable valve to the target angle, so that the engine continues to work; The window angle is a critical angle of the variable valve, at which the engine will not shut down and hydrogen can be prevented from entering and damaging the manifold to the greatest extent; When the judgment result is no, the angle of the variable valve is controlled to be a working angle; the working angle is an angle for improving the working performance of the engine; The adjusting the angle of the variable valve to the window angle and then adjusting the angle of the variable valve to the target angle comprises: adjusting the angle of the variable valve to a window angle; Acquire the maximum angle allowed by the variable valve during backfire as a target angle; The angle of the variable valve is adjusted to a target angle.

2. A hydrogen engine flashback control method as claimed in claim 1, It is characterized in that The determining whether the engine has backfire includes: monitoring the real-time temperature of the intake manifold, and determining that backfire occurs in the engine when the real-time temperature is greater than a preset temperature threshold; The temperature threshold is determined according to the speed and load of the engine.

3. A hydrogen engine flashback control method as claimed in claim 1, It is characterized in that The maximum angle allowed by the variable valve during backfire is obtained as a target angle, including: Based on the speed and load of the engine and the angle of the variable valve change when the historical backfire occurs, the maximum angle allowed when the variable valve backfires is calculated as the target angle.

4. A hydrogen engine flashback control method as claimed in claim 1, It is characterized in that The target angle is obtained through a learning model.

5. A hydrogen engine flashback control system, wherein the engine is provided with an intake manifold and a variable valve. It is characterized in that The system comprises, The first module determines whether the engine has backfire; The second module, when the judgment result is yes, adjusts the angle of the variable valve to the window angle, and then adjusts the angle of the variable valve to the target angle, so that the engine continues to work; The window angle is a critical angle of the variable valve, at which the engine will not shut down and hydrogen can be prevented from entering and damaging the manifold to the greatest extent; The second module adjusts the angle of the variable valve to the window angle, and then adjusts the angle of the variable valve to the target angle, including: adjusting the angle of the variable valve to a window angle; Acquire the maximum angle allowed by the variable valve during backfire as a target angle; adjusting the angle of the variable valve to a target angle; The third module, when the judgment result is no, controls the angle of the variable valve to be a working angle, and the working angle is an angle for improving the working performance of the engine.

6. A hydrogen engine flashback control system as claimed in claim 5, It is characterized in that The first module determines whether the engine has backfire including: monitoring the real-time temperature of the intake manifold, and determining that backfire occurs in the engine when the real-time temperature is greater than a preset temperature threshold; The temperature threshold is determined according to the speed and load of the engine.

7. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, It is characterized in that When the processor executes the program, the method according to any one of claims 1 to 4 is implemented.

8. A computer-readable storage medium having a computer program stored thereon, It is characterized in that When the program is executed by a processor, the method according to any one of claims 1 to 4 is implemented.

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