Precombustion chamber gas supply system and engine

Abstract

The application discloses a precombustion chamber gas supply system and an engine. The precombustion chamber gas supply system comprises a precombustion chamber, a jet control valve and a control module; the number of the precombustion chambers is multiple, at least one pressure detection piece is arranged in each precombustion chamber, and the pressure detection piece is used for detecting cylinder pressure information of the precombustion chamber; the jet control valve is the same as the number of the precombustion chambers and one-to-one corresponding, and the jet control valve is used for controlling a gas injection amount injected into the corresponding precombustion chamber; the input end of the control module is electrically connected with the multiple pressure detection pieces, and the output end of the control module is electrically connected with the multiple jet control valves; and the control module is used for acquiring the cylinder pressure information of the multiple precombustion chambers and controlling the multiple jet control valves to adjust the gas injection amount based on the cylinder pressure information of the multiple precombustion chambers. Through the above scheme, the problem that the precombustion chamber jet ignition energy is continuously changed, the engine combustion cycle fluctuates and the engine performance is affected is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engines, and in particular to a pre-chamber gas supply system and an engine. BACKGROUND

[0002] For a spark-ignition engine, the active pre-chamber ignition energy is several orders of magnitude higher than that of a normal spark plug, and can ignite a leaner mixture, which has a significant effect on reducing NOx emissions, accelerating combustion speed, and improving thermal efficiency. The amount of gas intake in the pre-chamber of the engine affects the air-fuel ratio in the pre-chamber, thereby changing the pre-chamber jet ignition energy, leading to engine combustion cycle variation, which affects the performance and emissions of the engine.

[0003] In the related art, the total gas flow is determined based on the total exhaust flow, and the pre-injection amount of the pre-chamber, i.e., the pre-chamber gas amount, is determined according to the pre-injection ratio. The problems of the related art are: 1. Since the total exhaust flow is the product after the in-cylinder combustion, it has a certain hysteresis and cannot reflect the state of each working cycle in real time; 2. Controlling the pre-injection amounts of each cylinder of the engine to be the same cannot eliminate the actual gas amount difference of each cylinder. The above problems will cause the gas amount in the pre-chamber of each cylinder and each cycle of the engine to be different, causing the pre-chamber jet ignition energy to change constantly, leading to engine combustion cycle variation and affecting the performance of the engine. SUMMARY

[0004] The present application provides a pre-chamber gas supply system and an engine to solve the problem of the pre-chamber jet ignition energy changing constantly, leading to engine combustion cycle variation and affecting the performance of the engine.

[0005] According to an aspect of the present application, a pre-chamber gas supply system is provided, which comprises a pre-chamber, a jet control valve and a control module.

[0006] The number of pre-chambers is multiple, and at least one pressure detection member is arranged in each pre-chamber, and the pressure detection member is used to detect the cylinder pressure information of the pre-chamber.

[0007] The number of jet control valves is the same as that of the pre-chambers and one-to-one correspondence, and the jet control valve is used to control the gas injection amount injected into the corresponding pre-chamber.

[0008] The input end of the control module is electrically connected with the multiple pressure detection members, and the output end of the control module is electrically connected with the multiple jet control valves.

[0009] The control module is used to acquire the cylinder pressure information of the multiple pre-chambers, and control the multiple jet control valves to adjust the gas injection amount based on the cylinder pressure information of the multiple pre-chambers.

[0010] In an optional embodiment of the present application, the control module is specifically configured to:

[0011] acquire cylinder pressure information of the plurality of pre-chambers within a preset number of working cycles;

[0012] determine a cylinder pressure peak value of each of the plurality of pre-chambers within the preset number of working cycles based on the cylinder pressure information of the plurality of pre-chambers within the preset number of working cycles;

[0013] determine a single-cylinder cylinder pressure peak value average of a single pre-chamber based on the cylinder pressure peak value of the single pre-chamber within the preset number of working cycles;

[0014] determine an all-cylinder cylinder pressure peak value average based on the single-cylinder cylinder pressure peak value averages of all the pre-chambers;

[0015] control the injection control valve corresponding to each of the pre-chambers to adjust the amount of gas injection based on the all-cylinder cylinder pressure peak value average and the single-cylinder cylinder pressure peak value average of each of the pre-chambers.

[0016] In an optional embodiment of the present application, the control module is specifically configured to:

[0017] determine a first cylinder pressure difference value of the single-cylinder cylinder pressure peak value average and the all-cylinder cylinder pressure peak value average of each of the pre-chambers;

[0018] determine whether the first cylinder pressure difference value exceeds a first preset cylinder pressure difference value range;

[0019] when the first cylinder pressure difference value exceeds the first preset cylinder pressure difference value range, control the injection control valve corresponding to the pre-chamber to adjust the amount of gas injection based on the single-cylinder cylinder pressure peak value average and the all-cylinder cylinder pressure peak value average of the pre-chamber;

[0020] when the first cylinder pressure difference value is within the first preset cylinder pressure difference value range, control the injection control valve corresponding to the pre-chamber to keep the amount of gas injection unchanged.

[0021] In an optional embodiment of the present application, the control module is specifically configured to:

[0022] when the first cylinder pressure difference value exceeds the first preset cylinder pressure difference value range and the single-cylinder cylinder pressure peak value average of the pre-chamber is greater than the all-cylinder cylinder pressure peak value average, control the injection control valve corresponding to the pre-chamber to reduce the amount of gas injection.

[0023] In an optional embodiment of the present application, the control module is specifically configured to:

[0024] When the first cylinder pressure difference value exceeds the first preset cylinder pressure difference value range and the single-cylinder cylinder pressure peak average value corresponding to the pre-combustion chamber is less than the full-cylinder cylinder pressure peak average value, the injection control valve corresponding to the pre-combustion chamber is controlled to increase the fuel injection amount.

[0025] In an optional embodiment of the present application, the control module is specifically used for:

[0026] determining a current cycle cylinder pressure peak value of each of the pre-combustion chambers in the current working cycle based on the cylinder pressure information of the pre-combustion chambers in the current working cycle;

[0027] controlling the injection control valve corresponding to each of the pre-combustion chambers to adjust the fuel injection amount based on the single-cylinder cylinder pressure peak average value and the current cycle cylinder pressure peak values corresponding to the pre-combustion chambers.

[0028] In an optional embodiment of the present application, the control module is specifically used for:

[0029] determining a second cylinder pressure difference value of the current cycle cylinder pressure peak value corresponding to each of the pre-combustion chambers and the single-cylinder cylinder pressure peak average value;

[0030] determining whether the second cylinder pressure difference value exceeds a second preset cylinder pressure difference value range;

[0031] when the second cylinder pressure difference value exceeds the second preset cylinder pressure difference value range, controlling the injection control valve corresponding to the pre-combustion chamber to adjust the fuel injection amount based on the current cycle cylinder pressure peak value corresponding to the pre-combustion chamber and the single-cylinder cylinder pressure peak average value;

[0032] when the second cylinder pressure difference value is in the second preset cylinder pressure difference value range, controlling the injection control valve corresponding to the pre-combustion chamber to keep the fuel injection amount unchanged.

[0033] In an optional embodiment of the present application, the control module is specifically used for:

[0034] when the second cylinder pressure difference value exceeds the second preset cylinder pressure difference value range and the current cycle cylinder pressure peak value corresponding to the pre-combustion chamber is greater than the single-cylinder cylinder pressure peak average value, controlling the injection control valve corresponding to the pre-combustion chamber to reduce the fuel injection amount.

[0035] In an optional embodiment of the present application, the control module is specifically used for:

[0036] when the second cylinder pressure difference value exceeds the second preset cylinder pressure difference value range and the current cycle cylinder pressure peak value corresponding to the pre-combustion chamber is less than the single-cylinder cylinder pressure peak average value, controlling the injection control valve corresponding to the pre-combustion chamber to increase the fuel injection amount.

[0037] According to another aspect of the present application, there is provided an engine comprising the pre-chamber gas supply system according to any one of the embodiments of the present application.

[0038] The technical scheme of the embodiment of the present application comprises the following steps: a plurality of pre-chambers are arranged, a pressure detection member is arranged in each pre-chamber to detect the cylinder pressure information of the pre-chamber, a jet control valve is arranged to control the amount of gas injected into the corresponding pre-chamber, the control module obtains the cylinder pressure information of the plurality of pre-chambers, and the plurality of jet control valves are controlled to adjust the amount of gas injection based on the cylinder pressure information of the plurality of pre-chambers. Thus, the amount of gas injection of the jet control valve corresponding to each pre-chamber can be controlled according to the cylinder pressure information of the pre-chamber, the jet ignition energy of each pre-chamber can be kept stable, and the engine can work in an optimal state. Since the cylinder pressure information changes with the change of the pre-chamber combustion state, compared with the related art in which the total exhaust flow is used to determine the total gas flow, and the pre-injection ratio is used to determine the pre-injection amount of the pre-chamber, the real-time performance is stronger, and the amount of gas injection of the jet control valve corresponding to each pre-chamber can be controlled according to the cylinder pressure information of the pre-chamber, instead of setting the pre-injection amount of all pre-chambers to the same value. Therefore, the actual gas amount difference of each pre-chamber can be better eliminated, and the problem that the jet ignition energy of the pre-chamber changes constantly, resulting in engine combustion cycle variation and affecting engine performance, is solved.

[0039] It should be understood that the content described in this part is not intended to identify key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0041] Figure 1 FIG. 1 is a structural schematic diagram of a pre-chamber gas supply system according to an embodiment of the present application;

[0042] Figure 2 FIG. 2 is a circuit block diagram of the pre-chamber gas supply system according to the embodiment of the present application.

[0043] In the drawings: 1, pre-chamber; 2, pressure detection member; 3, jet control valve; 4, control module. DETAILED DESCRIPTION

[0044] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0045] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0046] Example 1

[0047] Figure 1 This is a structural diagram of a pre-combustion chamber 1 gas supply system provided in the first embodiment of the present invention. The pre-combustion chamber 1 gas supply system can be used for an engine, and the engine can be specifically a spark-ignition engine. A spark-ignition engine is an engine that ignites a mixture in some way to generate flame propagation to achieve engine heat and power conversion. Figure 1 and Figure 2 As shown, the pre-combustion chamber 1 gas supply system includes a pre-combustion chamber 1, an injection control valve 3, and a control module 4. The pre-combustion chamber 1 corresponds to the main combustion chamber of the engine. It is a small space designed in the engine where ignition combustion is used to form a high-speed, high-temperature jet through the nozzle of the main combustion chamber to ignite the mixture in the main combustion chamber.

[0048] The number of pre-combustion chambers 1 is multiple, in some embodiments, the engine has multiple cylinders, at least one pre-combustion chamber 1 is arranged on each cylinder, in this embodiment, one pre-combustion chamber 1 is arranged on each cylinder. At least one pressure detection piece 2 is arranged in each pre-combustion chamber 1, the pressure detection piece 2 is used to detect the cylinder pressure information of the pre-combustion chamber 1; the cylinder pressure information refers to the information reflecting the pressure inside the pre-combustion chamber 1. In some embodiments, the cylinder pressure information includes a pressure curve. In some embodiments, the cylinder pressure information includes a pressure value. In some embodiments, the cylinder pressure information includes a pressure table. The pressure detection piece 2 refers to a component that can detect the pressure value. In this embodiment, the pressure detection piece 2 includes a pressure sensor, by arranging the pressure sensor inside the pre-combustion chamber 1, the pressure value inside the pre-combustion chamber 1 can be detected, that is, the cylinder pressure information of the pre-combustion chamber 1 is obtained. In this embodiment, each pre-combustion chamber 1 is provided with one pressure detection piece 2. It can be understood that in other embodiments, each pre-combustion chamber 1 can be provided with multiple pressure detection pieces 2, the average value of the pressure values detected by the multiple pressure detection pieces 2 is taken as the cylinder pressure information of the pre-combustion chamber 1, or the truncated mean of the pressure values detected by the multiple pressure detection pieces 2 is taken as the cylinder pressure information of the pre-combustion chamber 1, and the number of pressure detection pieces 2 in one pre-combustion chamber 1 is not specifically limited here, but is only illustrated by way of example.

[0049] As shown in Figure 1 and Figure 2 , the injection control valve 3 is the same as and one-to-one corresponds to the number of pre-combustion chambers 1, the injection control valve 3 is used to control the fuel injection amount injected into the corresponding pre-combustion chamber 1; that is, each pre-combustion chamber 1 has one injection control valve 3 to control fuel injection. In some embodiments, each pre-combustion chamber 1 has an intake pipeline, and the injection control valve 3 is arranged on the intake pipeline, thereby controlling the amount of fuel injected into the pre-combustion chamber 1, that is, controlling the fuel injection amount. Preferably, the injection control valve 3 is an electronically controlled fuel injection valve. The function of the electronically controlled fuel injection valve is to inject a certain amount of fuel into the pre-combustion chamber 1 at a certain pressure.

[0050] In some embodiments, the fuel injection amount is controlled by controlling the opening degree of the injection control valve 3, the greater the opening degree of the injection control valve 3, the greater the fuel injection amount, and the smaller the opening degree of the injection control valve 3, the smaller the fuel injection amount. In some embodiments, the fuel injection amount is controlled by controlling the injection pulse width of the injection control valve 3, the injection pulse width refers to the length of time for which the injection control valve 3 injects fuel each time. The greater the injection pulse width, the greater the fuel injection amount, and the smaller the injection pulse width, the smaller the fuel injection amount. It can be understood that in other embodiments, other ways can also be used to control the injection control valve 3 to adjust the fuel injection amount, and the specific method of controlling the injection control valve 3 to adjust the fuel injection amount is not specifically limited here, but is only illustrated by way of example.

[0051] As shown in Figure 1 and Figure 2As shown in the figure, the input end of the control module 4 is electrically connected with the plurality of pressure detection members 2, and the output end of the control module 4 is electrically connected with the plurality of injection control valves 3; wherein the control module 4 refers to a functional module for logical control, and in some embodiments, the control module 4 includes an electronic control unit (ECU, Engine Control Unit), which is a comprehensive control device of the engine. Since the input end of the control module 4 is electrically connected with the pressure detection member 2, the control module 4 can obtain the cylinder pressure information of the pre-chamber 1 detected by the pressure detection member 2. Since the output end of the control module 4 is electrically connected with the injection control valve 3, the control module 4 can output an electrical signal to the injection control valve 3 to control the injection control valve 3 to adjust the fuel injection amount.

[0052] As shown in the figure, Figure 1 and Figure 2 the control module 4 is configured to: obtain the cylinder pressure information of the plurality of pre-chambers 1, and control the plurality of injection control valves 3 to adjust the fuel injection amount based on the cylinder pressure information of the plurality of pre-chambers 1. When the fuel injection amount of the injection control valve 3 injected into the pre-chamber 1 is different, the combustion state in the pre-chamber 1 is different, and then the pressure in the pre-chamber 1 is different, that is, the cylinder pressure information is different. By allowing the fuel injection amount of each pre-chamber 1 to be adjusted according to the cylinder pressure information of the pre-chamber 1, and controlling the injection control valve 3 corresponding to the pre-chamber 1 to adjust the fuel injection amount according to the cylinder pressure information of the pre-chamber 1, the jet ignition energy of each pre-chamber 1 can be kept stable, and the engine can work in an optimal state.

[0053] The above scheme, by setting a plurality of pre-chambers 1, a pressure detection member 2 is arranged in each pre-chamber 1 to detect the cylinder pressure information of the pre-chamber 1, and an injection control valve 3 is arranged to control the fuel injection amount injected into the corresponding pre-chamber 1, and then a control module 4 is arranged to obtain the cylinder pressure information of the plurality of pre-chambers 1, and control the plurality of injection control valves 3 to adjust the fuel injection amount based on the cylinder pressure information of the plurality of pre-chambers 1. Thus, the injection control valve 3 corresponding to each pre-chamber 1 can be controlled to adjust the fuel injection amount according to the cylinder pressure information of the pre-chamber 1, and the jet ignition energy of each pre-chamber 1 can be kept stable, and the engine can work in an optimal state. Since the cylinder pressure information changes with the change of the combustion state of the pre-chamber 1, compared with the related art which determines the total fuel flow based on the total exhaust flow, and then determines the pre-injection amount of the pre-chamber 1 based on the pre-injection ratio, the real-time performance is stronger, and the injection control valve 3 corresponding to each pre-chamber 1 can be controlled to adjust the fuel injection amount according to the cylinder pressure information of the pre-chamber 1, rather than setting the pre-injection amount of all pre-chambers 1 to be the same value, so that the actual fuel amount difference of each pre-chamber 1 can be better eliminated, and the problem of engine combustion cycle variation caused by the change of jet ignition energy of the pre-chamber 1, which affects the performance of the engine, is solved.

[0054] In optional embodiments of the present application, as shown in the figure, Figure 1 andFigure 2 As shown in FIG. 1, the control module 4 is specifically configured to: acquire the cylinder pressure information of the plurality of pre-chambers 1 in a preset number of working cycles; determine the cylinder pressure peak value of each pre-chamber 1 in the preset number of working cycles based on the cylinder pressure information of the plurality of pre-chambers 1 in the preset number of working cycles; determine the single-cylinder cylinder pressure peak value average of a single pre-chamber 1 based on the cylinder pressure peak value of the pre-chamber 1 in the preset number of working cycles; determine the full-cylinder cylinder pressure peak value average based on the single-cylinder cylinder pressure peak value averages of all the pre-chambers 1; and control the injection control valve 3 corresponding to each pre-chamber 1 to adjust the fuel injection amount based on the full-cylinder cylinder pressure peak value average and the single-cylinder cylinder pressure peak value average of each pre-chamber 1.

[0055] The cylinder pressure peak value of a certain pre-chamber 1 in the preset number of working cycles is the maximum value of the cylinder pressure information of the pre-chamber 1 in the preset number of working cycles. The single-cylinder cylinder pressure peak value average of a certain pre-chamber 1 refers to the average of the plurality of cylinder pressure peak values of the pre-chamber 1 in the preset number of working cycles, each of which exists in each working cycle. The full-cylinder cylinder pressure peak value average refers to the average of the single-cylinder cylinder pressure peak value averages of all the pre-chambers 1. By controlling the injection control valve 3 corresponding to each pre-chamber 1 to adjust the fuel injection amount based on the full-cylinder cylinder pressure peak value average and the single-cylinder cylinder pressure peak value average of each pre-chamber 1, the uniformity of each pre-chamber 1 can be corrected, the difference in the cylinder pressure information of each pre-chamber 1 can be reduced, the energy of the pre-chamber 1 jet ignition can be stabilized, the engine combustion cycle variation can be reduced, and the engine can be ensured to work in an optimal state.

[0056] Based on the above embodiment, as shown in FIG. 2 and FIG. 3, the control module 4 is specifically configured to: determine the first cylinder pressure difference value of the single-cylinder cylinder pressure peak value average and the full-cylinder cylinder pressure peak value average of each pre-chamber 1; and determine whether the first cylinder pressure difference value exceeds a first preset cylinder pressure difference value range. Figure 1 Figure 2 When the first cylinder pressure difference value exceeds the first preset cylinder pressure difference value range, the injection control valve 3 corresponding to the pre-chamber 1 is controlled to adjust the fuel injection amount based on the single-cylinder cylinder pressure peak value average and the full-cylinder cylinder pressure peak value average of the pre-chamber 1.

[0057] When the first cylinder pressure difference value is in the first preset cylinder pressure difference value range, the injection control valve 3 corresponding to the pre-chamber 1 is controlled to keep the fuel injection amount unchanged.

[0058] When the first cylinder pressure difference value is in the first preset cylinder pressure difference value range, the injection control valve 3 corresponding to the pre-chamber 1 is controlled to keep the fuel injection amount unchanged.

[0059] ​The first cylinder pressure difference value refers to the difference between the single-cylinder cylinder pressure peak average value and the full-cylinder cylinder pressure peak average value, and the first preset cylinder pressure difference value range refers to a range that the first cylinder pressure difference value will not exceed when the pre-chamber 1 jet ignition energy is stable. When the first cylinder pressure difference value of the single-cylinder cylinder pressure peak average value and the full-cylinder cylinder pressure peak average value of a certain pre-chamber 1 exceeds the first preset cylinder pressure difference value range, it indicates that the pressure inside the pre-chamber 1 is too large or too small, at which time the gas injection amount needs to be adjusted, so the injection control valve 3 corresponding to the pre-chamber 1 is controlled to adjust the gas injection amount. When the first cylinder pressure difference value of the single-cylinder cylinder pressure peak average value and the full-cylinder cylinder pressure peak average value of a certain pre-chamber 1 does not exceed the first preset cylinder pressure difference value range, it indicates that the pressure inside the pre-chamber 1 is appropriate, at which time the injection control valve 3 corresponding to the pre-chamber 1 is controlled to keep the gas injection amount unchanged. In the above manner, the pre-chamber 1 jet ignition energy can be kept stable, the engine combustion cycle variation can be reduced, and the engine can be ensured to work in an optimal state.

[0060] In optional embodiments of the present application, as shown in Figure 1 and Figure 2 The control module 4 is specifically configured to: when the first cylinder pressure difference value exceeds the first preset cylinder pressure difference value range and the single-cylinder cylinder pressure peak average value corresponding to the pre-chamber 1 is greater than the full-cylinder cylinder pressure peak average value, controlling the injection control valve 3 corresponding to the pre-chamber 1 to reduce the gas injection amount. When the first cylinder pressure difference value exceeds the first preset cylinder pressure difference value range, it indicates that the gas injection amount of the pre-chamber 1 needs to be adjusted, and when the single-cylinder cylinder pressure peak average value corresponding to the pre-chamber 1 is greater than the full-cylinder cylinder pressure peak average value, it indicates that the pressure inside the pre-chamber 1 is too high, at which time the injection control valve 3 corresponding to the pre-chamber 1 is controlled to reduce the gas injection amount, which can reduce the pressure inside the pre-chamber 1, make the pressures inside the pre-chambers 1 more balanced, and keep the jet ignition energy inside the pre-chamber 1 stable.

[0061] In optional embodiments of the present application, the control module 4 is specifically configured to: when the first cylinder pressure difference value exceeds the first preset cylinder pressure difference value range and the single-cylinder cylinder pressure peak average value corresponding to the pre-chamber 1 is less than the full-cylinder cylinder pressure peak average value, controlling the injection control valve 3 corresponding to the pre-chamber 1 to increase the gas injection amount. When the first cylinder pressure difference value exceeds the first preset cylinder pressure difference value range, it indicates that the gas injection amount of the pre-chamber 1 needs to be adjusted, and when the single-cylinder cylinder pressure peak average value corresponding to the pre-chamber 1 is less than the full-cylinder cylinder pressure peak average value, it indicates that the pressure inside the pre-chamber 1 is too low, at which time the injection control valve 3 corresponding to the pre-chamber 1 is controlled to increase the gas injection amount, which can increase the pressure inside the pre-chamber 1, make the pressures inside the pre-chambers 1 more balanced, and keep the jet ignition energy inside the pre-chamber 1 stable.

[0062] In optional embodiments of the present application, as shown in Figure 1 and Figure 2As shown, the control module 4 is specifically configured to: determine the current cycle peak cylinder pressure of the plurality of pre-chambers 1 in the current working cycle based on the cylinder pressure information of the plurality of pre-chambers 1 in the current working cycle; and control the injection control valve 3 corresponding to each pre-chamber 1 to adjust the fuel injection amount based on the single-cylinder peak cylinder pressure average value and the plurality of current cycle peak cylinder pressures corresponding to the plurality of pre-chambers 1.

[0063] The current cycle peak cylinder pressure refers to the maximum value of the cylinder pressure information inside the pre-chamber 1 in the current working cycle, and the single-cylinder peak cylinder pressure average value refers to the average value of the internal cylinder pressure peak value of the pre-chamber 1 in a plurality of working cycles. By controlling the injection control valve 3 corresponding to each pre-chamber 1 to adjust the fuel injection amount based on the single-cylinder peak cylinder pressure average value and the current cycle peak cylinder pressure, the fuel injection amount of the next working cycle can be corrected according to the current cycle peak cylinder pressure of the current working cycle and the single-cylinder peak cylinder pressure average value, and the fuel injection amount of each pre-chamber 1 and each working cycle of the pre-chamber 1 can be accurately controlled, thereby ensuring stable pre-chamber 1 jet ignition energy, reducing engine combustion cycle variation, and ensuring that the engine works in an optimal state.

[0064] On the basis of the above embodiment, as shown in Figure 1 and Figure 2 The control module 4 is specifically configured to: determine the second cylinder pressure difference value of the plurality of current cycle peak cylinder pressures corresponding to the plurality of pre-chambers 1 and the corresponding single-cylinder peak cylinder pressure average value; and determine whether the second cylinder pressure difference value exceeds the second preset cylinder pressure difference value range.

[0065] When the second cylinder pressure difference value exceeds the second preset cylinder pressure difference value range, the injection control valve 3 corresponding to the pre-chamber 1 is controlled to adjust the fuel injection amount based on the current cycle peak cylinder pressure and the single-cylinder peak cylinder pressure average value corresponding to the pre-chamber 1.

[0066] When the second cylinder pressure difference value is within the second preset cylinder pressure difference value range, the injection control valve 3 corresponding to the pre-chamber 1 is controlled to keep the fuel injection amount unchanged.

[0067] The second cylinder pressure difference value refers to the difference between the current cycle cylinder pressure peak value and the single cylinder pressure peak value average value, and the second preset cylinder pressure difference value range refers to a range that the second cylinder pressure difference value will not exceed when the prechamber 1 jet ignition energy is stable. When the second cylinder pressure difference value of the current cycle cylinder pressure peak value and the single cylinder pressure peak value average value of a certain prechamber 1 exceeds the second preset cylinder pressure difference value range, it indicates that the internal pressure of the prechamber 1 is too large or too small when working in the current working cycle, at which time the gas injection amount needs to be adjusted, so the injection control valve 3 corresponding to the prechamber 1 adjusts the gas injection amount, so that the gas injection amount of the next working cycle changes, that is, the gas injection amount of the next working cycle is corrected. When the second cylinder pressure difference value of the current cycle cylinder pressure peak value and the single cylinder pressure peak value average value of a certain prechamber 1 does not exceed the second preset cylinder pressure difference value range, it indicates that the internal pressure of the prechamber 1 is appropriate, at which time the injection control valve 3 corresponding to the prechamber 1 keeps the gas injection amount unchanged. In the above manner, the prechamber 1 jet ignition energy can be kept stable, the engine combustion cycle variation can be reduced, and the engine can be ensured to work in the optimal state.

[0068] In an optional embodiment of the present application, as shown in Figure 1 and Figure 2 The control module 4 is specifically configured to: when the second cylinder pressure difference value exceeds the second preset cylinder pressure difference value range and the current cycle cylinder pressure peak value corresponding to the prechamber 1 is greater than the single cylinder pressure peak value average value, control the injection control valve 3 corresponding to the prechamber 1 to reduce the gas injection amount.

[0069] When the second cylinder pressure difference value exceeds the second preset cylinder pressure difference value range, it indicates that the gas injection amount of the prechamber 1 needs to be adjusted, and when the current cycle cylinder pressure peak value corresponding to the prechamber 1 is greater than the single cylinder pressure peak value average value, it indicates that the internal pressure of the prechamber 1 is too high, at which time the injection control valve 3 corresponding to the prechamber 1 reduces the gas injection amount, which can reduce the internal pressure of the prechamber 1 in the next working cycle, so that the internal pressures of the prechambers 1 are more balanced during subsequent work, and the prechamber 1 jet ignition energy is kept stable.

[0070] In an optional embodiment of the present application, the control module 4 is specifically configured to: when the second cylinder pressure difference value exceeds the second preset cylinder pressure difference value range and the current cycle cylinder pressure peak value corresponding to the prechamber 1 is less than the single cylinder pressure peak value average value, control the injection control valve 3 corresponding to the prechamber 1 to increase the gas injection amount.

[0071] When the second cylinder pressure difference value exceeds the second preset cylinder pressure difference value range, it indicates that the fuel injection amount of the pre-chamber 1 needs to be adjusted. When the current cycle cylinder pressure peak value corresponding to the pre-chamber 1 is less than the single-cylinder cylinder pressure peak average value, it indicates that the internal pressure of the pre-chamber 1 is too low during the current working cycle. At this time, the injection control valve 3 corresponding to the pre-chamber 1 is controlled to increase the fuel injection amount, which can increase the internal pressure of the pre-chamber 1 in the next working cycle, so that the internal pressure of each pre-chamber 1 is more balanced during subsequent working, and the jet ignition energy in the pre-chamber 1 is stable.

[0072] The working process of the present scheme is illustrated with a specific embodiment. In this embodiment, the number of pre-chambers 1 is n, and the n pre-chambers 1 are distinguished by serial numbers. First, the engine is running, and the injection control valve 3 performs injection according to the initial fuel injection amount. Then, the control module 4 obtains the single-cylinder cylinder pressure peak average value P1, P2, …, Pn of each pre-chamber 1 in a preset number of working cycles according to the cylinder pressure information of each pre-chamber 1 detected by the pressure detection member 2 in the preset number of working cycles. P1 refers to the average value of the cylinder pressure peak of the first pre-chamber 1 in the preset number of working cycles, i.e., the first pre-chamber 1 has a cylinder pressure peak in each working cycle, and the cylinder pressure peak is the maximum value of the cylinder pressure information of that working cycle. Then, the multiple cylinder pressure peaks of the preset number of working cycles are averaged to obtain the single-cylinder cylinder pressure peak average value of the pre-chamber 1. P2 refers to the average value of the cylinder pressure peak of the second pre-chamber 1 in the preset number of working cycles, and Pn refers to the average value of the cylinder pressure peak of the nth pre-chamber 1 in the preset number of working cycles. The calculation method is the same as that of the first pre-chamber 1, which is not described here. In this way, the single-cylinder cylinder pressure peak average values P1, P2, …, Pn of the n pre-chambers 1 can be calculated. After obtaining the single-cylinder cylinder pressure peak average values P1, P2, …, Pn of the n pre-chambers 1, the full-cylinder cylinder pressure peak average value P0 can be obtained, P0 = average(P1, P2, …, Pn).

[0073] Then the homogeneity correction is performed on each pre-chamber 1, and the control module 4 corrects the gas injection amount of the injection control valve 3 corresponding to each pre-chamber 1 to reduce the difference between the single-cylinder peak pressure average value and the full-cylinder peak pressure average value of each pre-chamber 1. Taking the first pre-chamber 1 as an example, the control module 4 determines the difference between the single-cylinder peak pressure average value P1 and the full-cylinder peak pressure average value P0 of the first pre-chamber 1 to obtain the first cylinder pressure difference value ΔP1, and then determines whether the first cylinder pressure difference value ΔP1 exceeds the first preset cylinder pressure difference value range. When the first cylinder pressure difference value ΔP1 of the first pre-chamber 1 is within the first preset cylinder pressure difference value range, the gas injection amount of the injection control valve 3 corresponding to the first pre-chamber 1 is kept unchanged. When the first cylinder pressure difference value ΔP1 of the first pre-chamber 1 exceeds the first preset cylinder pressure difference value range and the single-cylinder peak pressure average value P1 of the first pre-chamber 1 is greater than the full-cylinder peak pressure average value P0, the gas injection amount of the injection control valve 3 corresponding to the first pre-chamber 1 is reduced until the first cylinder pressure difference value ΔP1 of the first pre-chamber 1 is within the first preset cylinder pressure difference value range. When the first cylinder pressure difference value ΔP1 of the first pre-chamber 1 exceeds the first preset cylinder pressure difference value range and the single-cylinder peak pressure average value P1 of the first pre-chamber 1 is less than the full-cylinder peak pressure average value P0, the gas injection amount of the injection control valve 3 corresponding to the first pre-chamber 1 is increased until the first cylinder pressure difference value ΔP1 of the first pre-chamber 1 is within the first preset cylinder pressure difference value range. Similarly, until the first cylinder pressure difference values (ΔP1, ΔP2, …, ΔPn) of the single-cylinder peak pressure average value and the full-cylinder peak pressure average value of all pre-chambers 1 are within the first preset cylinder pressure difference value range, so as to correct the gas injection amount of all pre-chambers 1.

[0074] Then the working cycle of each precombustion chamber 1 is corrected. Taking the first precombustion chamber 1 as an example, the control module 4 determines the second cylinder pressure difference value ΔS1 of the first precombustion chamber 1 by the difference between the current cycle cylinder pressure peak value P of the current working cycle of the first precombustion chamber 1 and the single cylinder pressure peak average value P1, and then determines whether the second cylinder pressure difference value ΔS1 exceeds the second preset cylinder pressure difference value range. When the second cylinder pressure difference value ΔS1 is in the second preset cylinder pressure difference value range, the injection control valve 3 corresponding to the first precombustion chamber 1 is controlled to keep the fuel gas injection amount unchanged. When the second cylinder pressure difference value ΔS1 exceeds the second preset cylinder pressure difference value range and the current cycle cylinder pressure peak value P of the precombustion chamber 1 corresponding to the first precombustion chamber 1 is greater than the single cylinder pressure peak average value P1, the injection control valve 3 corresponding to the first precombustion chamber 1 is controlled to reduce the fuel gas injection amount until the second cylinder pressure difference value ΔS1 of the first precombustion chamber 1 is in the second preset cylinder pressure difference value range. When the second cylinder pressure difference value exceeds the second preset cylinder pressure difference value range and the current cycle cylinder pressure peak value P of the precombustion chamber 1 corresponding to the first precombustion chamber 1 is less than the single cylinder pressure peak average value P1, the injection control valve 3 corresponding to the first precombustion chamber 1 is controlled to increase the fuel gas injection amount until the second cylinder pressure difference value ΔS1 of the first precombustion chamber 1 is in the second preset cylinder pressure difference value range. In this way, the second cylinder pressure difference value (ΔS1, ΔS2, …, ΔSn) of the single cylinder pressure peak average value and the current cycle cylinder pressure peak value of all precombustion chambers 1 is in the second preset cylinder pressure difference value range, so as to correct the fuel gas injection amount of the next working cycle of all precombustion chambers 1.

[0075] Through the above scheme, the fuel gas injection amount of each precombustion chamber 1 in each working cycle can be accurately controlled according to the cylinder pressure information in each precombustion chamber 1, so as to ensure the stable precombustion chamber 1 jet ignition energy, reduce the engine combustion cycle variation, and ensure the engine to work in the optimal state.

[0076] Embodiment Two

[0077] The embodiment two of the present application provides an engine comprising the precombustion chamber 1 fuel supply system of any embodiment of the present application.

[0078] In the optional embodiment of the present application, the engine can be a spark-ignition engine, which is an engine that ignites the mixture by some means to generate flame propagation to realize heat work conversion.

[0079] As Figure 1 and Figure 2As shown, in an optional embodiment of the present invention, the engine includes a main combustion chamber and a pre-combustion chamber 1. The pre-combustion chamber 1 of the gas supply system corresponds to the main combustion chamber of the engine. This refers to a small space designed in the engine where ignition combustion is utilized to form a high-speed, high-temperature jet through the nozzle of the main combustion chamber to ignite the mixture in the main combustion chamber. There are multiple pre-combustion chambers 1. In some embodiments, the engine has multiple cylinders, each of which is provided with at least one pre-combustion chamber 1. In this embodiment, each cylinder is provided with a pre-combustion chamber 1.

[0080] The above scheme, by disposing multiple precombustion chambers 1 inside the engine, is equipped with a pressure detection element 2 in each precombustion chamber 1 to detect the cylinder pressure information of the precombustion chamber 1, and an injection control valve 3 is provided to control the amount of gas injected into the corresponding precombustion chamber 1. Then, the cylinder pressure information of the multiple precombustion chambers 1 is obtained by the control module 4, and the multiple injection control valves 3 are controlled to adjust the gas injection amount based on the cylinder pressure information of the multiple precombustion chambers 1. In this way, the injection control valve 3 corresponding to each precombustion chamber 1 can be controlled to adjust the gas injection amount according to the cylinder pressure information of each precombustion chamber 1, which can maintain the stability of the jet ignition energy of each precombustion chamber 1 and ensure that the engine operates in an optimal state. Since the cylinder pressure information will change with the change of the combustion state of the pre-combustion chamber 1, compared with the related technology of using the total exhaust flow to determine the total gas flow, and then determining the pre-injection amount of the pre-combustion chamber 1 according to the pre-injection ratio, it has stronger real-time performance. At the same time, it can control the injection control valve 3 corresponding to the pre-combustion chamber 1 to adjust the gas injection amount according to the cylinder pressure information of each pre-combustion chamber 1, instead of setting the pre-injection amount of all pre-combustion chambers 1 to the same value. Therefore, it can better eliminate the actual gas amount difference of each pre-combustion chamber 1, and solve the problem that the ignition energy of the jet in the pre-combustion chamber 1 changes continuously, causing the engine combustion cycle to change and affecting the engine performance.

[0081] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0082] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A prechamber gas supply system characterized by comprising: The pre-chamber, the injection control valve and the control module are included. The number of the pre-chambers is multiple, and at least one pressure detection element is arranged in each of the pre-chambers, and the pressure detection element is used for detecting the cylinder pressure information of the pre-chamber. The injection control valve is the same as the number of the pre-chambers and one-to-one corresponding, and the injection control valve is used for controlling the fuel injection amount injected into the corresponding pre-chamber. The input end of the control module is electrically connected with the multiple pressure detection elements, and the output end of the control module is electrically connected with the multiple injection control valves. The control module is used for: Obtaining the cylinder pressure information of the multiple pre-chambers in a preset number of working cycles; Determining the cylinder pressure peak value of each pre-chamber in the preset number of working cycles based on the cylinder pressure information of the multiple pre-chambers in the preset number of working cycles; Determining the single-cylinder cylinder pressure peak average value of the pre-chamber based on the cylinder pressure peak value of the single pre-chamber in the preset number of working cycles; Determining the full-cylinder cylinder pressure peak average value based on the single-cylinder cylinder pressure peak average value of all the pre-chambers; Controlling the injection control valve corresponding to each pre-chamber to adjust the fuel injection amount based on the full-cylinder cylinder pressure peak average value and the single-cylinder cylinder pressure peak average value of each pre-chamber; Determining the first cylinder pressure difference value of the single-cylinder cylinder pressure peak average value and the full-cylinder cylinder pressure peak average value of each pre-chamber; Determining whether the first cylinder pressure difference value exceeds a first preset cylinder pressure difference value range; When the first cylinder pressure difference value exceeds the first preset cylinder pressure difference value range, controlling the injection control valve corresponding to the pre-chamber to adjust the fuel injection amount based on the single-cylinder cylinder pressure peak average value and the full-cylinder cylinder pressure peak average value of the pre-chamber; When the first cylinder pressure difference value is in the first preset cylinder pressure difference value range, controlling the injection control valve corresponding to the pre-chamber to keep the fuel injection amount unchanged.

2. The pre-chamber fuel supply system of claim 1, wherein The control module is specifically used for: When the first cylinder pressure difference value exceeds the first preset cylinder pressure difference value range and the single-cylinder cylinder pressure peak average value of the pre-chamber is greater than the full-cylinder cylinder pressure peak average value, controlling the injection control valve corresponding to the pre-chamber to reduce the fuel injection amount.

3. The pre-chamber fuel supply system of claim 1, wherein The control module is specifically used for: When the first cylinder pressure difference value exceeds the first preset cylinder pressure difference value range and the single-cylinder cylinder pressure peak average value of the pre-chamber is less than the full-cylinder cylinder pressure peak average value, controlling the injection control valve corresponding to the pre-chamber to increase the fuel injection amount.

4. The pre-chamber gas supply system according to any one of claims 1 to 3, characterized in that, The control module is specifically used for: Determining the current cycle cylinder pressure peak value of the multiple pre-chambers in the current working cycle based on the cylinder pressure information of the multiple pre-chambers in the current working cycle; Controlling the injection control valve corresponding to each pre-chamber to adjust the fuel injection amount based on the single-cylinder cylinder pressure peak average value and the multiple current cycle cylinder pressure peak values corresponding to the multiple pre-chambers.

5. The pre-chamber fuel supply system of claim 4, wherein The control module is specifically used for: Determining the second cylinder pressure difference value of the multiple current cycle cylinder pressure peak values corresponding to the multiple pre-chambers and the single-cylinder cylinder pressure peak average value corresponding thereto; Determining whether the second cylinder pressure difference value exceeds a second preset cylinder pressure difference value range; when the second cylinder pressure difference value exceeds the second preset cylinder pressure difference value range, based on the current cycle cylinder pressure peak value corresponding to the precombustion chamber and the single cylinder cylinder pressure peak value average, controlling the injection control valve corresponding to the precombustion chamber to adjust the gas injection amount; when the second cylinder pressure difference value is in the second preset cylinder pressure difference value range, controlling the injection control valve corresponding to the precombustion chamber to keep the gas injection amount unchanged.

6. The pre-chamber fuel supply system of claim 5, wherein The control module is specifically used for: when the second cylinder pressure difference value exceeds the second preset cylinder pressure difference value range and the current cycle cylinder pressure peak value corresponding to the precombustion chamber is greater than the single cylinder cylinder pressure peak value average, controlling the injection control valve corresponding to the precombustion chamber to reduce the gas injection amount.

7. The pre-chamber fuel supply system of claim 5, wherein The control module is specifically used for: when the second cylinder pressure difference value exceeds the second preset cylinder pressure difference value range and the current cycle cylinder pressure peak value corresponding to the precombustion chamber is less than the single cylinder cylinder pressure peak value average, controlling the injection control valve corresponding to the precombustion chamber to increase the gas injection amount.

8. An engine characterized by: The precombustion chamber gas supply system of any one of claims 1-7 is included.

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