Anti-knock ignition system of hydrogen internal combustion engine, control method and device of anti-knock ignition system, storage medium and electronic equipment

Abstract

The invention relates to the technical field of engines, in particular to an anti-knock ignition system of a hydrogen internal combustion engine, a control method and device of the anti-knock ignition system, a storage medium and electronic equipment. The system comprises an ignition coil, an external resistor and a spark plug, wherein the external resistor is connected to the secondary end of the ignition coil in parallel and close to the side where the spark plug is located; the control method comprises the steps of obtaining a current ignition advance angle; calculating a current knock index; whether the knock index is smaller than a current knock index threshold value or not is judged, if not, the ignition advance angle is adjusted according to a preset updating path, and the preset updating path is jointly determined according to the ignition advance angle, the knock index, the knock index threshold value and the adjusting coefficient; and if yes, the current ignition advance angle is kept, and an ignition control signal is sent according to the current ignition advance angle. Compared with the prior art, the method has the advantages that the risk of secondary discharge of the ignition coil is reduced, and engine knock suppression under all working conditions is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and in particular to an anti-knock ignition system for a hydrogen internal combustion engine and a control method, device, storage medium and electronic equipment thereof. Background Art

[0002] As a clean, carbon-free energy source with abundant sources, hydrogen has the characteristics of low quality, high calorific value, rapid combustion propagation and good anti-explosion performance. Therefore, it is considered to be one of the most promising zero-carbon emission energy sources for automotive power systems in the 21st century. Hydrogen internal combustion engines have relatively low requirements for the purity of hydrogen fuel, and are similar to traditional internal combustion engines in structure and have strong compatibility. They retain the main structure and system of traditional internal combustion engines and are no different from traditional fuel engines in working principle. They can rely on the existing mature internal combustion engine industrial system and conduct corresponding adaptive research and design on hydrogen supply and injection systems, special cold spark plugs, turbochargers, lubrication and crankshaft ventilation to achieve mass production at low cost and large-scale promotion and application. Compared with hydrogen fuel cells, which are more technically difficult, hydrogen internal combustion engines have huge industrial advantages. However, due to the physical and chemical characteristics of hydrogen such as low ignition energy, high combustion speed and wide combustion limit, detonation is very easy to occur in internal combustion engines, which seriously affects the operating stability, efficiency and durability of the engine. Therefore, how to control the detonation of hydrogen internal combustion engines is a major difficulty.

[0003] In order to control the knock of hydrogen internal combustion engines, the existing patent CN116857099A designs a straight-passage hydrogen internal combustion engine structure to solve the problem of knock caused by insufficient mixing in the cylinder of the direct injection internal combustion engine; the existing patent CN117231357A selects different operating modes and injection strategies under different working conditions to ensure stable operation under low load, high-efficiency operation under medium load, and no knock under high load; the existing patent CN115839273A suppresses knock by controlling the excess air coefficient. The above patents mainly suppress knock by optimizing the structure, optimizing the injection strategy, and adjusting the excess air coefficient. However, in fact, spark plug hot spots and secondary discharge of the ignition coil can also cause knock, and there are few solutions to this defect. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and to provide a hydrogen internal combustion engine anti-knock ignition system and its control method, device, storage medium and electronic equipment, which can effectively reduce the risk of secondary discharge of the ignition coil and achieve engine knock suppression under all operating conditions.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] According to a first aspect of the present invention, there is provided an anti-knock ignition system for a hydrogen internal combustion engine, comprising an ignition coil, an external resistor and a spark plug, wherein the external resistor is connected in parallel to the secondary end of the ignition coil and close to the side where the spark plug is located.

[0007] As a preferred technical solution, the system further includes a variable resistor, and the variable resistor is connected to the ignition coil.

[0008] As a preferred technical solution, the system further includes an electronic control unit connected to the variable resistor, and the electronic control unit is used to adjust the resistance according to the feedback signal.

[0009] According to a second aspect of the present invention, there is provided an anti-knock ignition control method for a hydrogen internal combustion engine, the control method being used for the anti-knock ignition system of the hydrogen internal combustion engine, comprising the following steps: S201, obtaining a current ignition advance angle; S202, calculating a current knock index; S203, determining whether the knock index is less than a current knock index threshold: if not, adjusting the ignition advance angle according to a preset update path, and returning to S201, the preset update path being determined based on the ignition advance angle, the knock index, the knock index threshold and an adjustment coefficient, the adjustment coefficient being used to determine the sensitivity of the ignition advance angle to knock suppression; if yes, executing S204; S204, maintaining the current ignition advance angle, and sending an ignition control signal based on the current ignition advance angle.

[0010] As a preferred technical solution, the knock index threshold is expressed as:

[0011] KI critical =KI critical,base [1+f(RPM,Load)]

[0012] In the formula, KI critical is the current knock index threshold, KI critical,base is the initial knock index threshold, f(RPM, Load) is the correction factor based on engine operating parameters, RPM represents speed, and Load represents load.

[0013] As a preferred technical solution, the preset update path is expressed as:

[0014] θ spark,new ＝ θ spark - k·(KI-KI critical )

[0015] In the formula, θ spark,new is the adjusted ignition advance angle, θ sparkis the current ignition advance angle, k is the adjustment coefficient, KI is the current knock index, KI critical is the current knock index threshold.

[0016] As a preferred technical solution, the calculation formula of the knock index is:

[0017]

[0018] Where A is the frequency factor related to hydrogen, P is the instantaneous pressure in the cylinder, m is the pressure index, and E a is the activation energy of hydrogen, R is the gas constant, T is the instantaneous temperature in the cylinder, f(φ) is the correction function related to the excess air coefficient of the mixture, t o and t end is the integration time interval.

[0019] According to a third aspect of the present invention, there is provided an anti-knock ignition control device for a hydrogen internal combustion engine, comprising at least: an ignition advance angle real-time acquisition module for acquiring a current ignition advance angle; a knock index real-time calculation module for calculating a current knock index; an ignition advance angle adjustment module for determining whether the knock index is less than a current knock index threshold value: if not, adjusting the ignition advance angle according to a preset update path, and returning to the ignition advance angle real-time acquisition module, the preset update path being determined jointly according to the ignition advance angle, the knock index, the knock index threshold value and an adjustment coefficient, the adjustment coefficient being used to determine the suppression sensitivity of the ignition advance angle to knock; if yes, executing an ignition control signal sending module; and an ignition control signal sending module, for maintaining the current ignition advance angle and sending an ignition control signal according to the current ignition advance angle.

[0020] According to a fourth aspect of the present invention, there is provided a computer-readable storage medium, the computer-readable storage medium comprising a stored program, wherein the control method is executed when the program is run.

[0021] According to a fifth aspect of the present invention, there is provided an electronic device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor is configured to execute the control method through the computer program.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The anti-knock ignition system for hydrogen internal combustion engines provided by the present invention has an external resistor connected in parallel to the secondary end of the ignition coil, and the external resistor is close to the side where the spark plug is located. The external resistor limits the current peak of the primary circuit and suppresses the high-frequency oscillation inside the coil, thereby reducing the extra sparks generated by the secondary end. The external resistor can smooth the energy released by the ignition coil, making the secondary voltage output more stable. Therefore, the present invention can avoid the occurrence of extra high-voltage spikes in the secondary circuit after the spark plug completes ignition, suppress the occurrence of secondary discharge from the root, and improve the working stability of the ignition coil;

[0024] 2. The anti-knock ignition control method for a hydrogen internal combustion engine provided by the present invention and the corresponding device, storage medium and electronic equipment can control and adjust the ignition advance angle in real time, thereby suppressing knock under all working conditions and improving the working stability and efficiency of the engine;

[0025] 3. The present invention can not only improve the stability and durability of the hydrogen internal combustion engine by suppressing knock, but also indirectly improve the combustion efficiency and thermal efficiency of the engine, and has strong potential for industrial promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A structural schematic diagram of an ignition system is provided in an embodiment of the present invention;

[0027] Wherein: 101, ignition coil; 102, external resistor; 103, spark plug; 104, variable resistor; 105, ECU;

[0028] Figure 2 A flow chart of a control method is provided in an embodiment of the present invention;

[0029] Figure 3 A schematic diagram of the structure of a control device is provided in an embodiment of the present invention;

[0030] Among them: 301, ignition advance angle real-time acquisition module; 302, knock index real-time calculation module; 303, ignition advance angle adjustment module; 304, ignition control signal sending module. DETAILED DESCRIPTION

[0031] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0032] Example

[0033] Hydrogen has attracted much attention as an internal combustion engine fuel due to its excellent combustion performance and zero carbon emission characteristics. However, due to the physical and chemical properties of hydrogen, such as low ignition energy, high combustion speed and wide combustion limit, it is very easy to produce knock in the internal combustion engine, which seriously affects the operating stability, efficiency and durability of the engine. The prior art ignores the problem that spark plug hot spots and secondary discharge of ignition coils can also cause knock. Therefore, the present invention proposes a hydrogen internal combustion engine anti-knock ignition system and its control method. Among them, the hydrogen internal combustion engine anti-knock ignition system improves the stability of the ignition coil and reduces the risk of secondary discharge by connecting an external resistor between the ignition coil and the ignition system; the hydrogen internal combustion engine anti-knock ignition control method controls the ignition advance angle in real time to suppress engine knock under all working conditions and improve the working stability and efficiency of the engine.

[0034] Figure 1 The structure of an anti-knock ignition system for a hydrogen internal combustion engine provided in this embodiment is shown. The anti-knock ignition system includes an ignition coil 101, an external resistor 102, a spark plug 103, a variable resistor 104 and an electronic control unit (i.e., ECU 105). The external resistor 102 is connected in parallel to the secondary end of the ignition coil 101 and is close to the side where the spark plug 103 is located, the variable resistor 104 is connected to the ignition coil 101, and the ECU 105 is connected to the variable resistor 104 to adjust the resistance according to the feedback signal.

[0035] When the ignition coil 101 is working, the rapid disconnection of the primary current will cause high-frequency oscillation, which may cause secondary discharge of the secondary voltage. The ignition system provided in this embodiment can effectively avoid the secondary discharge of the ignition coil as follows:

[0036] The external resistor 102 limits the current spike of the primary circuit and suppresses the high-frequency oscillation inside the coil, thereby reducing the extra sparks generated at the secondary end; and the external resistor 102 can smooth the energy released by the ignition coil 101, making the secondary voltage output more stable. This can avoid the occurrence of extra high-voltage spikes in the secondary circuit after the spark plug 103 completes ignition, and suppress the occurrence of secondary discharge from the root. In addition, by adding a variable resistor 104, the primary circuit current can be dynamically adjusted to affect the ignition energy.

[0037] Furthermore, the present embodiment also provides a hydrogen internal combustion engine anti-knock ignition control method, which can be used for the aforementioned hydrogen internal combustion engine anti-knock ignition system. Figure 2 An implementation process of the control method is shown, which specifically includes the following steps:

[0038] Step S200, engine ignition;

[0039] Step S201, obtaining the current ignition advance angle θ spark ;

[0040] Step S202, during the operation of the engine, the current knock index KI is calculated in real time;

[0041] Step S203: determine whether the knock index KI is less than the current knock index threshold KI critical :

[0042] If not, KI ≥ KI critical , then adjust the ignition advance angle θ according to the preset update path spark , and returns to step S201, the preset update path is based on the ignition advance angle θ spark , Knock index KI, Knock index threshold KI critical and an adjustment coefficient k, the adjustment coefficient k is used to determine the sensitivity of the ignition advance angle to knock suppression;

[0043] If yes, KI<KI critical , then execute step S204;

[0044] Step S204, maintain the current ignition advance angle θ spark , and according to the current ignition advance angle θ spark , send ignition control signal.

[0045] Optionally, the knock index threshold KI in step S203 critical According to the real-time adjustment of speed, load and other working conditions, it can be expressed as:

[0046] KI critical =KI critical,base [1+f (RPM,Load)] (1)

[0047] In the formula, KI critical is the current knock index threshold, KI critical,base is the initial knock index threshold, which may be preset, and f(RPM, Load) is a correction factor based on engine operating parameters. The engine operating parameters include speed, load, etc., RPM represents speed, and Load represents load.

[0048] Optionally, in step S203, when KI ≥ KI critical When the ignition advance angle θ spark The preset update path is expressed as:

[0049] θ spark,new ＝ θ spark - k·(KI-KI critical ) (2)

[0050] In the formula, θ spark,newis the adjusted ignition advance angle, k is the adjustment coefficient, which reflects the sensitivity of the ignition advance angle to knock suppression.

[0051] In addition, the calculation formula of knock index KI is:

[0052]

[0053] Where A is the frequency factor related to hydrogen, P is the instantaneous pressure in the cylinder, m is the pressure index, and E is a is the activation energy of hydrogen, R is the gas constant, T is the instantaneous temperature in the cylinder, f(φ) is the correction function related to the excess air coefficient of the mixture, t o and t end It is the integration time interval, usually the key time point from the compression stroke to the combustion stage.

[0054] Furthermore, according to the aforementioned anti-knock ignition control method for a hydrogen internal combustion engine, this embodiment also provides a virtual device, namely, an anti-knock ignition control device for a hydrogen internal combustion engine. Figure 3 A structure of the control device is shown, including an ignition advance angle real-time acquisition module 301, a knock index real-time calculation module 302, an ignition advance angle adjustment module 303 and an ignition control signal sending module 304. Among them: the ignition advance angle real-time acquisition module 301 is used to obtain the current ignition advance angle; the knock index real-time calculation module 302 is used to calculate the current knock index; the ignition advance angle adjustment module 303 is used to determine whether the knock index is less than the current knock index threshold: if not, the ignition advance angle is adjusted according to the preset update path, and the ignition advance angle real-time acquisition module 301 is returned. The preset update path is determined according to the ignition advance angle, the knock index, the knock index threshold and the adjustment coefficient. The adjustment coefficient is used to determine the suppression sensitivity of the ignition advance angle to the knock; if yes, the ignition control signal sending module 304 is executed; the ignition control signal sending module 304 is used to maintain the current ignition advance angle and send an ignition control signal according to the current ignition advance angle. The specific execution process of each module is basically consistent with the steps of the aforementioned method, and will not be repeated here.

[0055] Furthermore, according to the aforementioned anti-knock ignition control method for a hydrogen internal combustion engine, this embodiment also provides a computer-readable storage medium, the computer-readable storage medium comprising a stored program, wherein when the program is running, one or more steps of the aforementioned method are executed, and the specific execution process is not repeated here.

[0056] Furthermore, according to the aforementioned anti-knock ignition control method for a hydrogen internal combustion engine, this embodiment also provides an electronic device, including a memory and a processor, wherein a computer program is stored in the memory, and the processor is configured to execute one or more steps of the aforementioned method through the computer program, and the specific execution process will not be repeated here.

[0057] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A hydrogen internal combustion engine anti-knock ignition system, characterized in that: The invention comprises an ignition coil, an external resistor and a spark plug. The external resistor is connected in parallel to the secondary end of the ignition coil and is close to the side where the spark plug is located.

2. The anti-knock ignition system for a hydrogen internal combustion engine according to claim 1, characterized in that: The system further includes a variable resistor connected to the ignition coil.

3. The anti-knock ignition system for a hydrogen internal combustion engine according to claim 2, characterized in that: The system further comprises an electronic control unit connected to the variable resistor, and the electronic control unit is used for adjusting the resistance according to the feedback signal.

4. A method for controlling the anti-knock ignition of a hydrogen internal combustion engine, characterized in that: The control method is used for the anti-knock ignition system of a hydrogen internal combustion engine as claimed in claim 1, comprising the following steps: S201, obtaining the current ignition advance angle; S202, calculating the current knock index; S203, determining whether the knock index is less than a current knock index threshold: If not, adjusting the ignition advance angle according to a preset update path, and returning to S201, wherein the preset update path is determined according to the ignition advance angle, the knock index, the knock index threshold, and an adjustment coefficient, wherein the adjustment coefficient is used to determine the suppression sensitivity of the ignition advance angle to the knock; If yes, execute S204; S204, maintaining the current ignition advance angle, and sending an ignition control signal according to the current ignition advance angle.

5. The anti-knock ignition control method for a hydrogen internal combustion engine according to claim 4, characterized in that: The knock index threshold is expressed as: KI critical =KI critical,base ·[1+f(RPM,Load)] In the formula, KI critical is the current knock index threshold, KI critical,base is the initial knock index threshold, f(RPM, Load) is the correction factor based on engine operating parameters, RPM represents speed, and Load represents load.

6. The anti-knock ignition control method for a hydrogen internal combustion engine according to claim 4, characterized in that: The preset update path is expressed as: θ spark,new ＝ θ spark - k (KI-KI critical ) In the formula, θ spark,new is the adjusted ignition advance angle, θ spark is the current ignition advance angle, k is the adjustment coefficient, KI is the current knock index, KI critical is the current knock index threshold.

7. The anti-knock ignition control method for a hydrogen internal combustion engine according to claim 4, characterized in that: The calculation formula of the knock index is: Where A is the frequency factor related to hydrogen, P is the instantaneous pressure in the cylinder, m is the pressure index, and E a is the activation energy of hydrogen, R is the gas constant, T is the instantaneous temperature in the cylinder, f(φ) is the correction function related to the excess air coefficient of the mixture, t o and t end is the integration time interval.

8. A hydrogen internal combustion engine anti-knock ignition control device, characterized in that: At least: Ignition advance angle real-time acquisition module, used to obtain the current ignition advance angle; Knock index real-time calculation module, used to calculate the current knock index; The ignition advance angle adjustment module is used to determine whether the knock index is less than the current knock index threshold: If not, adjusting the ignition advance angle according to a preset update path, and returning to the ignition advance angle real-time acquisition module, wherein the preset update path is determined according to the ignition advance angle, the knock index, the knock index threshold, and an adjustment coefficient, wherein the adjustment coefficient is used to determine the suppression sensitivity of the ignition advance angle to the knock; If yes, the ignition control signal sending module is executed; And an ignition control signal sending module is used to maintain the current ignition advance angle and send an ignition control signal according to the current ignition advance angle.

9. A computer-readable storage medium, the computer-readable storage medium comprising a stored program, wherein: When the program is executed, the control method described in any one of claims 4 to 7 is executed.

10. An electronic device comprising a memory and a processor, characterized in that: The memory stores a computer program, and the processor is configured to execute the control method described in any one of claims 4 to 7 through the computer program.

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