Pre-combustion chamber fuel gas supply system and engine

Abstract

The invention discloses a pre-combustion chamber fuel gas supply system and an engine. The pre-combustion chamber fuel gas supply system comprises a pre-combustion chamber, an injection control valve and a control module. The number of the pre-combustion chambers is multiple, at least one pressure detection piece is arranged in each pre-combustion chamber, and the pressure detection pieces are used for detecting cylinder pressure information of the pre-combustion chambers; the injection control valves and the pre-combustion chambers are the same in number and are in one-to-one correspondence, and the injection control valves are used for controlling the injection amount of fuel gas injected into the corresponding pre-combustion chambers. 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 injection control valves. The control module is used for obtaining cylinder pressure information of the multiple pre-combustion chambers and controlling the multiple injection control valves to adjust the fuel gas injection amount based on the cylinder pressure information of the multiple pre-combustion chambers. By the adoption of the scheme, the problems that jet ignition energy of the pre-combustion chamber continuously changes, engine combustion cycle changes, and engine performance is affected are solved.

Description

Technical Field

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

[0002] For spark-ignition engines, the ignition energy of the active pre-chamber is several orders of magnitude higher than that of ordinary spark plugs, 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 engine pre-chamber will affect the air-fuel ratio in the pre-chamber, thereby changing the ignition energy of the pre-chamber jet, causing changes in the engine combustion cycle, and affecting the engine's performance and emissions.

[0003] In the related technology, the total gas flow is usually determined based on the total exhaust flow, and then the pre-injection amount of the pre-combustion chamber, that is, the pre-combustion chamber gas amount, is determined according to the pre-injection ratio. The problems existing in the related technology are: 1. Since the total exhaust flow is the product of combustion in the cylinder, it has a certain lag and cannot reflect the state of each working cycle in real time; 2. The pre-injection amount of each cylinder of the engine is controlled to be the same, and the difference in the actual gas amount of each cylinder cannot be eliminated. The above problems will cause differences in the amount of gas in the pre-combustion chamber of each cylinder and each cycle of the engine, causing the ignition energy of the pre-combustion chamber jet to change continuously, resulting in changes in the engine combustion cycle and affecting the engine performance. Summary of the invention

[0004] The present invention provides a pre-combustion chamber gas supply system and an engine, so as to solve the problem that the pre-combustion chamber jet ignition energy changes continuously, causing the engine combustion cycle to change and affecting the engine performance.

[0005] According to one aspect of the present invention, there is provided a pre-combustion chamber gas supply system, the pre-combustion chamber gas supply system comprising a pre-combustion chamber, an injection control valve and a control module;

[0006] There are multiple pre-combustion chambers, each of which is provided with at least one pressure detection element, and the pressure detection element is used to detect cylinder pressure information of the pre-combustion chamber;

[0007] The injection control valves are the same in number and correspond one to one with the pre-combustion chambers, and the injection control valves are used to control the amount of fuel gas injected into the corresponding pre-combustion chambers;

[0008] The input end of the control module is electrically connected to the plurality of pressure detection elements, and the output end of the control module is electrically connected to the plurality of injection control valves;

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

[0010] In an optional embodiment of the present invention, the control module is specifically used for:

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

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

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

[0014] Determine the average value of the peak value of the cylinder pressure of all cylinders based on the average value of the peak value of the cylinder pressure of all the pre-combustion chambers;

[0015] Based on the all-cylinder cylinder pressure peak average value and the single-cylinder cylinder pressure peak average value of each pre-combustion chamber, the injection control valve corresponding to each pre-combustion chamber is controlled to adjust the gas injection amount.

[0016] In an optional embodiment of the present invention, the control module is specifically used for:

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

[0018] determining 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, based on the single cylinder pressure peak value average value and the full cylinder pressure peak value average value corresponding to the pre-combustion chamber, controlling the injection control valve corresponding to the pre-combustion chamber to adjust the gas injection amount;

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

[0021] In an optional embodiment of the present invention, the control module is specifically used for:

[0022] 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 greater than the full-cylinder cylinder pressure peak average value, the injection control valve corresponding to the pre-combustion chamber is controlled to reduce the gas injection amount.

[0023] In an optional embodiment of the present invention, the control module is specifically used for:

[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 gas injection amount.

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

[0026] Determine the current cycle cylinder pressure peak values ​​of the plurality of pre-combustion chambers in the current working cycle based on the cylinder pressure information of the plurality of pre-combustion chambers in the current working cycle;

[0027] Based on the single-cylinder cylinder pressure peak value average value and multiple current cycle cylinder pressure peak values ​​corresponding to multiple pre-combustion chambers, the injection control valve corresponding to each pre-combustion chamber is controlled to adjust the gas injection amount.

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

[0029] Determine a second cylinder pressure difference value of a plurality of current cycle cylinder pressure peak values ​​corresponding to a plurality of the pre-combustion chambers and an average value of the corresponding single cylinder cylinder pressure peak values;

[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, based on the current cycle cylinder pressure peak value corresponding to the pre-combustion chamber and the average value of the single cylinder cylinder pressure peak value, controlling the injection control valve corresponding to the pre-combustion chamber to adjust the gas injection amount;

[0032] When the second cylinder pressure difference value is within the second preset cylinder pressure difference value range, the injection control valve corresponding to the pre-combustion chamber is controlled to keep the fuel gas injection amount unchanged.

[0033] In an optional embodiment of the present invention, 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 value average value, the injection control valve corresponding to the pre-combustion chamber is controlled to reduce the gas injection amount.

[0035] In an optional embodiment of the present invention, 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 value average value, the injection control valve corresponding to the pre-combustion chamber is controlled to increase the gas injection amount.

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

[0038] The technical solution of the embodiment of the present invention is to set up multiple pre-combustion chambers, each of which is provided with a pressure detection component to detect the cylinder pressure information of the pre-combustion chamber, and set an injection control valve to control the amount of gas injected into the corresponding pre-combustion chamber, and then obtain the cylinder pressure information of the multiple pre-combustion chambers through the control module, and control the multiple injection control valves to adjust the amount of gas injection based on the cylinder pressure information of the multiple pre-combustion chambers. In this way, the injection control valve corresponding to each pre-combustion chamber can be controlled to adjust the amount of gas injection according to the cylinder pressure information of each pre-combustion chamber, and the ignition energy of the jet in each pre-combustion chamber can be kept stable, ensuring that the engine works in the optimal state. Since the cylinder pressure information will change with the change of the combustion state of the pre-combustion chamber, 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 according to the pre-injection ratio, it has stronger real-time performance. At the same time, it can control the injection control valve corresponding to the pre-combustion chamber to adjust the gas injection amount according to the cylinder pressure information of each pre-combustion chamber, instead of setting the pre-injection amount of all pre-combustion chambers to the same value. Therefore, it can better eliminate the actual gas amount difference of each pre-combustion chamber, and solve the problem of the continuous change of the ignition energy of the pre-combustion chamber jet, which causes the engine combustion cycle to change and affects the engine performance.

[0039] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0041] Figure 1 A schematic structural diagram of a pre-combustion chamber gas supply system provided in Embodiment 1 of the present invention;

[0042] Figure 2 This is a circuit block diagram of a pre-combustion chamber gas supply system provided in Example 1 of the present invention.

[0043] Among them: 1. Pre-combustion chamber; 2. Pressure detection component; 3. Injection control valve; 4. Control module. DETAILED DESCRIPTION

[0044] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme 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 described embodiments 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 creative work should fall within the scope of protection of the present invention.

[0045] It should be noted that the terms "first", "second", etc. in the specification 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 data 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 that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0046] Embodiment 1

[0047] Figure 1 The structural schematic diagram of a pre-combustion chamber 1 gas supply system provided in the first embodiment of the present invention is a pre-combustion chamber 1 gas supply system which can be used for an engine, and the engine can be specifically a spark ignition engine, which 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, which means that a small space is designed in the engine, and the ignition combustion therein forms a high-speed high-temperature jet through the nozzle of the main combustion chamber to ignite the mixed gas in the main combustion chamber.

[0048] There are multiple precombustion chambers 1. In some embodiments, the engine has multiple cylinders, and each cylinder is provided with at least one precombustion chamber 1. In the present embodiment, each cylinder is provided with a precombustion chamber 1. Each precombustion chamber 1 is provided with at least one pressure detection component 2, and the pressure detection component 2 is used to detect the cylinder pressure information of the precombustion chamber 1; the cylinder pressure information refers to the information reflecting the pressure inside the precombustion 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 component 2 refers to a component that can detect the pressure value. In the present embodiment, the pressure detection component 2 includes a pressure sensor. By arranging the pressure sensor inside the precombustion chamber 1, the pressure value inside the precombustion chamber 1 can be detected, that is, the cylinder pressure information of the precombustion chamber 1 is obtained. In the present embodiment, each precombustion chamber 1 is provided with a pressure detection component 2. It can be understood that, in other embodiments, each pre-combustion chamber 1 may be provided with a plurality of pressure detection components 2, and the average value of the pressure values ​​detected by the plurality of pressure detection components 2 may be taken as the cylinder pressure information of the pre-combustion chamber 1, or the truncated mean value of the pressure values ​​detected by the plurality of pressure detection components 2 may be taken as the cylinder pressure information of the pre-combustion chamber 1. The number of pressure detection components 2 in a pre-combustion chamber 1 is not specifically limited here, and is only used as an example.

[0049] like Figure 1 and Figure 2 As shown, the number of injection control valves 3 and pre-combustion chambers 1 is the same and corresponds one to one, and the injection control valves 3 are used to control the amount of gas injected into the corresponding pre-combustion chamber 1; that is, each pre-combustion chamber 1 has an injection control valve 3 for controlling gas 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 to control the amount of gas injected into the pre-combustion chamber 1, that is, to control the amount of gas injected. Preferably, the injection control valve 3 is an electronically controlled gas injection valve. The function of the electronically controlled gas injection valve is to inject a certain amount of gas into the pre-combustion chamber 1 at a certain pressure.

[0050] In some embodiments, the gas injection amount is controlled by controlling the opening of the injection control valve 3. When the opening of the injection control valve 3 is larger, the gas injection amount is larger, and when the opening of the injection control valve 3 is smaller, the gas injection amount is smaller. In some embodiments, the gas 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 controlling the injection control valve 3 to inject gas each time. When the injection pulse width is larger, the gas injection amount is larger, and when the injection pulse width is smaller, the gas injection amount is smaller. It can be understood that in other embodiments, other methods can also be used to control the injection control valve 3 to adjust the gas injection amount. The specific method of controlling the injection control valve 3 to adjust the gas injection amount is not specifically limited here, but is just an example.

[0051] like Figure 1 and Figure 2As shown, the input end of the control module 4 is electrically connected to multiple pressure detection components 2, and the output end of the control module 4 is electrically connected to multiple injection control valves 3; wherein, the control module 4 refers to a functional module for performing logical control. 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 to the pressure detection component 2, the control module 4 can obtain the cylinder pressure information of the pre-combustion chamber 1 detected by the pressure detection component 2. Since the output end of the control module 4 is electrically connected to 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 gas injection amount.

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

[0053] The above scheme, by setting up multiple pre-combustion chambers 1, each pre-combustion chamber 1 is provided with a pressure detection component 2 to detect the cylinder pressure information of the pre-combustion chamber 1, and an injection control valve 3 is provided to control the amount of gas injected into the corresponding pre-combustion chamber 1, and then the cylinder pressure information of multiple pre-combustion chambers 1 is obtained through the control module 4, and multiple injection control valves 3 are controlled to adjust the amount of gas injection based on the cylinder pressure information of multiple pre-combustion chambers 1. Therefore, the injection control valve 3 corresponding to each pre-combustion chamber 1 can be controlled to adjust the amount of gas injection according to the cylinder pressure information of each pre-combustion chamber 1, and the jet ignition energy of each pre-combustion chamber 1 can be kept stable, ensuring that the engine works in the optimal state. Since the cylinder pressure information will change with the change of the combustion state of the precombustion 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 precombustion 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 precombustion chamber 1 to adjust the gas injection amount according to the cylinder pressure information of each precombustion chamber 1, instead of setting the pre-injection amount of all precombustion chambers 1 to the same value. Therefore, it can better eliminate the difference in actual gas amount of each precombustion chamber 1, and solve the problem that the ignition energy of the jet in the precombustion chamber 1 changes continuously, causing changes in the engine combustion cycle and affecting the engine performance.

[0054] In an optional embodiment of the present invention, Figure 1 and Figure 2 As shown, the control module 4 is specifically used for: obtaining cylinder pressure information of multiple precombustion chambers 1 within a preset number of working cycles; determining the cylinder pressure peak value of each precombustion chamber 1 within a preset number of working cycles based on the cylinder pressure information of multiple precombustion chambers 1 within a preset number of working cycles; determining the single-cylinder cylinder pressure peak value average value of the precombustion chamber 1 based on the cylinder pressure peak value of a single precombustion chamber 1 within a preset number of working cycles; determining the full-cylinder cylinder pressure peak value average value based on the single-cylinder cylinder pressure peak value average value of all precombustion chambers 1; and controlling the injection control valve 3 corresponding to each precombustion chamber 1 to adjust the gas injection amount based on the full-cylinder cylinder pressure peak value average value and the single-cylinder cylinder pressure peak value average value of each precombustion chamber 1.

[0055] Among them, the cylinder pressure peak value of a certain precombustion chamber 1 within a preset number of working cycles is the maximum value of the cylinder pressure information of the precombustion chamber 1 within the preset number of working cycles. The average value of the single-cylinder cylinder pressure peak value of a certain precombustion chamber 1 means that the precombustion chamber 1 has a cylinder pressure peak value in each working cycle, and the average value of multiple cylinder pressure peak values ​​of the precombustion chamber 1 within the preset number of working cycles. The average value of the full-cylinder cylinder pressure peak value refers to the average value of the single-cylinder cylinder pressure peak values ​​of all precombustion chambers 1. By controlling the injection control valve 3 corresponding to each precombustion chamber 1 to adjust the gas injection amount based on the full-cylinder cylinder pressure peak value and the single-cylinder cylinder pressure peak value of each precombustion chamber 1, it is possible to perform uniformity correction on each precombustion chamber 1 and reduce the difference in cylinder pressure information of each precombustion chamber 1, thereby ensuring the stability of the jet ignition energy of the precombustion chamber 1, reducing the engine combustion cycle variation, and ensuring that the engine operates in the optimal state.

[0056] Based on the above embodiments, Figure 1 and Figure 2 As shown, the control module 4 is specifically used to: determine the first cylinder pressure difference value between the single cylinder pressure peak value average value and the full cylinder pressure peak value average value of each pre-combustion chamber 1; and determine whether the first cylinder pressure difference value exceeds a first preset cylinder pressure difference value range.

[0057] When the first cylinder pressure difference value exceeds the first preset cylinder pressure difference value range, based on the single cylinder pressure peak value average value and the full cylinder pressure peak value average value corresponding to the pre-combustion chamber 1, the injection control valve 3 corresponding to the pre-combustion chamber 1 is controlled to adjust the gas injection amount.

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

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

[0060] In an optional embodiment of the present invention, Figure 1 and Figure 2 As shown, the control module 4 is specifically used to: 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 value corresponding to the pre-combustion chamber 1 is greater than the full cylinder cylinder pressure peak value average value, control the injection control valve 3 corresponding to the pre-combustion chamber 1 to reduce the gas injection amount. Among them, when the first cylinder pressure difference value exceeds the first preset cylinder pressure difference value range, it means that the gas injection amount of the pre-combustion chamber 1 needs to be adjusted, and when the single cylinder cylinder pressure peak value average value corresponding to the pre-combustion chamber 1 is greater than the full cylinder cylinder pressure peak value average value, it means that the pressure inside the pre-combustion chamber 1 is too high. At this time, controlling the injection control valve 3 corresponding to the pre-combustion chamber 1 to reduce the gas injection amount can reduce the pressure inside the pre-combustion chamber 1, so that the pressure inside each pre-combustion chamber 1 is more balanced, and the jet ignition energy in the pre-combustion chamber 1 is kept stable.

[0061] In an optional embodiment of the present invention, the control module 4 is specifically used to: 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 value corresponding to the pre-combustion chamber 1 is less than the full cylinder cylinder pressure peak value average value, control the injection control valve 3 corresponding to the pre-combustion chamber 1 to increase the gas injection amount. Among them, when the first cylinder pressure difference value exceeds the first preset cylinder pressure difference value range, it means that the gas injection amount of the pre-combustion chamber 1 needs to be adjusted, and when the single cylinder cylinder pressure peak value average value corresponding to the pre-combustion chamber 1 is less than the full cylinder cylinder pressure peak value average value, it means that the pressure inside the pre-combustion chamber 1 is too low. At this time, controlling the injection control valve 3 corresponding to the pre-combustion chamber 1 to increase the gas injection amount can increase the pressure inside the pre-combustion chamber 1, so that the pressure inside each pre-combustion chamber 1 is more balanced, and the jet ignition energy in the pre-combustion chamber 1 is kept stable.

[0062] In an optional embodiment of the present invention, Figure 1 and Figure 2As shown, the control module 4 is specifically used to: determine the current cycle cylinder pressure peak values ​​of multiple precombustion chambers 1 in the current working cycle based on the cylinder pressure information of multiple precombustion chambers 1 in the current working cycle; and control the injection control valve 3 corresponding to each precombustion chamber 1 to adjust the gas injection amount based on the average value of the single-cylinder cylinder pressure peak value and the multiple current cycle cylinder pressure peak values ​​corresponding to the multiple precombustion chambers 1.

[0063] Among them, the current cycle cylinder pressure peak refers to the maximum value of the cylinder pressure information inside the pre-combustion chamber 1 of the current working cycle, and the single-cylinder cylinder pressure peak average refers to the average value of the internal cylinder pressure peaks of the pre-combustion chamber 1 in multiple working cycles. By adjusting the gas injection amount based on the single-cylinder cylinder pressure peak average and the current cycle cylinder pressure peak value, the corresponding injection control valve 3 is controlled to adjust the gas injection amount. The gas injection amount of the next working cycle can be corrected according to the current cycle cylinder pressure peak and the single-cylinder cylinder pressure peak average of the current working cycle, and the gas injection amount of each pre-combustion chamber 1 and the pre-combustion chamber 1 of each working cycle can be accurately controlled, thereby ensuring the stability of the jet ignition energy of the pre-combustion chamber 1, reducing the engine combustion cycle changes, and ensuring that the engine operates in the optimal state.

[0064] Based on the above embodiments, Figure 1 and Figure 2 As shown, the control module 4 is specifically used to: determine the second cylinder pressure difference value of the average value of multiple current cycle cylinder pressure peak values ​​and corresponding single cylinder cylinder pressure peak values ​​corresponding to multiple pre-combustion chambers 1; 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, based on the current cycle cylinder pressure peak value and the single cylinder cylinder pressure peak average value corresponding to the precombustion chamber 1, the injection control valve 3 corresponding to the precombustion chamber 1 is controlled to adjust the gas injection amount.

[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-combustion chamber 1 is controlled to keep the fuel gas injection amount unchanged.

[0067] Among them, the second cylinder pressure difference value refers to the difference between the current cycle cylinder pressure peak value and the average value of the single cylinder cylinder pressure peak value, and the second preset cylinder pressure difference value range refers to the range that the second cylinder pressure difference value will not exceed when the jet ignition energy of the pre-combustion chamber 1 is stable. When the second cylinder pressure difference value between the current cycle cylinder pressure peak value and the average value of the single cylinder cylinder pressure peak value of a certain pre-combustion chamber 1 exceeds the second preset cylinder pressure difference value range, it means that the internal pressure of the pre-combustion chamber 1 is too large or too small when the current working cycle is working. At this time, the gas injection amount needs to be adjusted, so the injection control valve 3 corresponding to the pre-combustion chamber 1 is controlled to adjust the gas injection amount, so that the gas injection amount of the next working cycle is changed, that is, the gas injection amount of the next working cycle is corrected. When the second cylinder pressure difference value between the current cycle cylinder pressure peak value and the average value of the single cylinder cylinder pressure peak value of a certain pre-combustion chamber 1 does not exceed the second preset cylinder pressure difference value range, it means that the pressure inside the pre-combustion chamber 1 is appropriate. At this time, the injection control valve 3 corresponding to the pre-combustion chamber 1 is controlled to keep the gas injection amount unchanged. In the above manner, the jet ignition energy of the pre-combustion chamber 1 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 invention, Figure 1 and Figure 2 As shown, the control module 4 is specifically used 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 pre-combustion chamber 1 is greater than the single cylinder cylinder pressure peak value average, control the injection control valve 3 corresponding to the pre-combustion chamber 1 to reduce the gas injection amount.

[0069] Among them, when the second cylinder pressure difference value exceeds the second preset cylinder pressure difference value range, it means that the gas injection amount of the precombustion chamber 1 needs to be adjusted. When the current cycle cylinder pressure peak value corresponding to the precombustion chamber 1 is greater than the single cylinder cylinder pressure peak value average, it means that the pressure inside the precombustion chamber 1 is too high. At this time, the injection control valve 3 corresponding to the precombustion chamber 1 is controlled to reduce the gas injection amount, which can reduce the pressure inside the precombustion chamber 1 in the next working cycle, so that the pressure inside each precombustion chamber 1 is more balanced during subsequent work, thereby keeping the jet ignition energy in the precombustion chamber 1 stable.

[0070] In an optional embodiment of the present invention, the control module 4 is specifically used 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 pre-combustion chamber 1 is less than the single cylinder cylinder pressure peak value average, control the injection control valve 3 corresponding to the pre-combustion chamber 1 to increase the gas injection amount.

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

[0072] The working process of this solution is described below with a specific embodiment. In this embodiment, the number of pre-combustion chambers 1 is n, and the n pre-combustion chambers 1 are distinguished by serial numbers. First, the engine is running, and the injection control valve 3 performs injection intake according to the initial fuel gas injection amount. Then, the control module 4 obtains the single-cylinder cylinder pressure peak value average values ​​P1, P2, ..., Pn of each precombustion chamber 1 in a preset number of working cycles based on the cylinder pressure information of each precombustion chamber 1 in a preset number of working cycles detected by the pressure detection component 2, where P1 refers to the average value of the cylinder pressure peak value of the first precombustion chamber 1 in a preset number of working cycles, that is, the first precombustion chamber 1 has a cylinder pressure peak value in each working cycle, and the cylinder pressure peak value is the maximum value of the cylinder pressure information of the working cycle, and then the multiple cylinder pressure peak values ​​of the preset number of working cycles are averaged to obtain the single-cylinder cylinder pressure peak value average value of the precombustion chamber 1, P2 refers to the average value of the cylinder pressure peak value of the second precombustion chamber 1 in a preset number of working cycles, and Pn refers to the average value of the cylinder pressure peak value of the nth precombustion chamber 1 in a preset number of working cycles. The calculation methods are consistent with those of the first precombustion chamber 1 and are not repeated here. By analogy, the single-cylinder cylinder pressure peak value average values ​​P1, P2, ..., Pn of n precombustion chambers 1 can be calculated. After obtaining the average values ​​of the single-cylinder cylinder pressure peak values ​​P1, P2, ..., Pn of the n pre-combustion chambers 1, the average value of the full-cylinder cylinder pressure peak value P0 can be obtained, P0 = average (P1, P2, ..., Pn).

[0073] Then, uniformity correction is performed on each pre-combustion chamber 1, and the control module 4 corrects the gas injection amount of the injection control valve 3 corresponding to each pre-combustion chamber 1 to reduce the difference between the single-cylinder cylinder pressure peak value average value and the full-cylinder cylinder pressure peak value average value of each pre-combustion chamber 1. Taking the first pre-combustion chamber 1 as an example, the control module 4 determines the difference between the single-cylinder cylinder pressure peak value average value P1 and the full-cylinder cylinder pressure peak value average value P0 of the first pre-combustion 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-combustion chamber 1 is within the first preset cylinder pressure difference value range, the injection control valve 3 corresponding to the first pre-combustion chamber 1 is controlled to keep the gas injection amount unchanged. When the first cylinder pressure difference ΔP1 of the first precombustion chamber 1 exceeds the first preset cylinder pressure difference value range and the single cylinder cylinder pressure peak average value P1 of the first precombustion chamber 1 is greater than the full cylinder cylinder pressure peak average value P0, the injection control valve 3 corresponding to the precombustion chamber 1 is controlled to reduce the gas injection amount until the first cylinder pressure difference ΔP1 of the first precombustion chamber 1 is within the first preset cylinder pressure difference value range. When the first cylinder pressure difference ΔP1 of the first precombustion chamber 1 exceeds the first preset cylinder pressure difference value range and the single cylinder cylinder pressure peak average value P1 corresponding to the precombustion chamber 1 is less than the full cylinder cylinder pressure peak average value P0, the injection control valve 3 corresponding to the precombustion chamber 1 is controlled to increase the gas injection amount until the first cylinder pressure difference ΔP1 of the first precombustion chamber 1 is within the first preset cylinder pressure difference value range. And so on, until the first cylinder pressure difference values ​​(ΔP1, ΔP2, ..., ΔPn) of the single cylinder cylinder pressure peak average value and the full cylinder cylinder pressure peak average value of all precombustion chambers 1 are within the first preset cylinder pressure difference value range, so as to realize the correction of the gas injection amount of all precombustion chambers 1.

[0074] Then, the working cycle correction of a single pre-combustion chamber 1 is performed. Taking the first pre-combustion chamber 1 as an example, the control module 4 determines the difference between the current cycle cylinder pressure peak value P and the single cylinder cylinder pressure peak value average value P1 of the current working cycle of the first pre-combustion chamber 1 to obtain the second cylinder pressure difference value ΔS1, 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 within the second preset cylinder pressure difference value range, the injection control valve 3 corresponding to the first pre-combustion chamber 1 is controlled to keep the 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 corresponding to the pre-combustion chamber 1 is greater than the single cylinder cylinder pressure peak value average value P1, the injection control valve 3 corresponding to the pre-combustion chamber 1 is controlled to reduce the gas injection amount until the second cylinder pressure difference value ΔS1 of the first pre-combustion chamber 1 is within 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 corresponding to the pre-combustion chamber 1 is less than the single cylinder cylinder pressure peak value average value P1, the injection control valve 3 corresponding to the first pre-combustion chamber 1 is controlled to increase the gas injection amount until the second cylinder pressure difference value ΔS1 of the first pre-combustion chamber 1 is within the second preset cylinder pressure difference value range. And so on, until the single cylinder cylinder pressure peak value average value of all pre-combustion chambers 1 and the second cylinder pressure difference value (ΔS1, ΔS2, ..., ΔSn) of the current cycle cylinder pressure peak value are all within the second preset cylinder pressure difference value range, so as to realize the correction of the gas injection amount of the next working cycle of all pre-combustion chambers 1.

[0075] Through the above scheme, the gas injection amount of each precombustion chamber 1 in each working cycle can be accurately controlled according to the cylinder pressure information inside each precombustion chamber 1, thereby ensuring the stability of the jet ignition energy of the precombustion chamber 1, reducing the engine combustion cycle variation, and ensuring that the engine operates in the optimal state.

[0076] Embodiment 2

[0077] Embodiment 2 of the present invention provides an engine, comprising the pre-combustion chamber 1 gas supply system of any embodiment of the present invention.

[0078] In an optional embodiment of the present invention, the engine may specifically be a spark-ignition engine, which is an engine that ignites a mixture in some way to generate flame propagation to achieve engine heat-to-work conversion.

[0079] like Figure 1 and Figure 2As shown, in an optional embodiment of the present invention, the engine includes a main combustion chamber, a pre-combustion chamber 1. The pre-combustion chamber 1 of the gas supply system corresponds to the main combustion chamber of the engine, which means that a small space is designed in the engine, and the ignition combustion therein is used to form a high-speed high-temperature jet through the nozzle of the main combustion chamber to ignite the mixed gas in the main combustion chamber. There are multiple pre-combustion chambers 1. In some embodiments, the engine has multiple cylinders, and each cylinder 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 setting multiple pre-combustion chambers 1 inside the engine, each pre-combustion chamber 1 is provided with a pressure detection component 2 to detect the cylinder pressure information of the pre-combustion chamber 1, and an injection control valve 3 is provided to control the amount of gas injected into the corresponding pre-combustion chamber 1, and then the cylinder pressure information of multiple pre-combustion chambers 1 is obtained through the control module 4, and multiple injection control valves 3 are controlled to adjust the amount of gas injection based on the cylinder pressure information of multiple pre-combustion chambers 1. Therefore, the injection control valve 3 corresponding to each pre-combustion chamber 1 can be controlled to adjust the amount of gas injection according to the cylinder pressure information of each pre-combustion chamber 1, and the jet ignition energy of each pre-combustion chamber 1 can be kept stable, ensuring that the engine works in the optimal state. Since the cylinder pressure information will change with the change of the combustion state of the precombustion 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 precombustion 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 precombustion chamber 1 to adjust the gas injection amount according to the cylinder pressure information of each precombustion chamber 1, instead of setting the pre-injection amount of all precombustion chambers 1 to the same value. Therefore, it can better eliminate the difference in actual gas amount of each precombustion chamber 1, and solve the problem that the ignition energy of the jet in the precombustion chamber 1 changes continuously, causing changes in the engine combustion cycle and affecting the engine performance.

[0081] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0082] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A pre-combustion chamber gas supply system, characterized in that: Includes a pre-combustion chamber, an injection control valve and a control module; There are multiple pre-combustion chambers, each of which is provided with at least one pressure detection element, and the pressure detection element is used to detect cylinder pressure information of the pre-combustion chamber; The injection control valves are the same in number and correspond one to one with the pre-combustion chambers, and the injection control valves are used to control the amount of fuel gas injected into the corresponding pre-combustion chambers; The input end of the control module is electrically connected to the plurality of pressure detection elements, and the output end of the control module is electrically connected to the plurality of injection control valves; The control module is used to obtain cylinder pressure information of the plurality of pre-combustion chambers, and control the plurality of injection control valves to adjust the gas injection amount based on the cylinder pressure information of the plurality of pre-combustion chambers.

2. The pre-combustion chamber gas supply system according to claim 1, characterized in that: The control module is specifically used for: Acquiring cylinder pressure information of a plurality of the pre-combustion chambers within a preset number of working cycles; Determining a cylinder pressure peak value of each of the pre-combustion chambers within a preset number of working cycles based on cylinder pressure information of the plurality of pre-combustion chambers within a preset number of working cycles; Determine an average value of a single cylinder cylinder pressure peak value of the pre-combustion chamber based on a cylinder pressure peak value of a single pre-combustion chamber within a preset number of working cycles; Determine the average value of the peak value of the cylinder pressure of all cylinders based on the average value of the peak value of the cylinder pressure of all the pre-combustion chambers; Based on the all-cylinder cylinder pressure peak average value and the single-cylinder cylinder pressure peak average value of each pre-combustion chamber, the injection control valve corresponding to each pre-combustion chamber is controlled to adjust the gas injection amount.

3. The pre-combustion chamber gas supply system according to claim 2, characterized in that: The control module is specifically used for: Determine a first cylinder pressure difference value of the single-cylinder cylinder pressure peak value average value and the all-cylinder cylinder pressure peak value average value of each of the pre-combustion chambers; 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, based on the single cylinder pressure peak value average value and the full cylinder pressure peak value average value corresponding to the pre-combustion chamber, controlling the injection control valve corresponding to the pre-combustion chamber to adjust the gas injection amount; When the first cylinder pressure difference value is within the first preset cylinder pressure difference value range, the injection control valve corresponding to the pre-combustion chamber is controlled to keep the gas injection amount unchanged.

4. The pre-combustion chamber gas supply system according to claim 3, characterized in that: 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 corresponding to the pre-combustion chamber is greater than the full-cylinder cylinder pressure peak average value, the injection control valve corresponding to the pre-combustion chamber is controlled to reduce the gas injection amount.

5. The pre-combustion chamber gas supply system according to claim 3, characterized in that: 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 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 gas injection amount.

6. The pre-combustion chamber gas supply system according to any one of claims 2 to 5, characterized in that: The control module is specifically used for: Determine the current cycle cylinder pressure peak values ​​of the plurality of pre-combustion chambers in the current working cycle based on the cylinder pressure information of the plurality of pre-combustion chambers in the current working cycle; Based on the single-cylinder cylinder pressure peak value average value and multiple current cycle cylinder pressure peak values ​​corresponding to multiple pre-combustion chambers, the injection control valve corresponding to each pre-combustion chamber is controlled to adjust the gas injection amount.

7. The pre-combustion chamber gas supply system according to claim 6, characterized in that: The control module is specifically used for: Determine a second cylinder pressure difference value of a plurality of current cycle cylinder pressure peak values ​​corresponding to a plurality of the pre-combustion chambers and an average value of the corresponding single cylinder cylinder pressure peak values; 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 pre-combustion chamber and the average value of the single cylinder cylinder pressure peak value, controlling the injection control valve corresponding to the pre-combustion chamber to adjust the gas injection amount; When the second cylinder pressure difference value is within the second preset cylinder pressure difference value range, the injection control valve corresponding to the pre-combustion chamber is controlled to keep the fuel gas injection amount unchanged.

8. The pre-combustion chamber gas supply system according to claim 7, characterized in that: 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 pre-combustion chamber is greater than the single cylinder cylinder pressure peak value average value, the injection control valve corresponding to the pre-combustion chamber is controlled to reduce the gas injection amount.

9. The pre-combustion chamber gas supply system according to claim 7, characterized in that: 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 pre-combustion chamber is less than the single cylinder cylinder pressure peak value average value, the injection control valve corresponding to the pre-combustion chamber is controlled to increase the gas injection amount.

10. An engine, characterized in that: A pre-combustion chamber gas supply system comprising the pre-combustion chamber gas supply system according to any one of claims 1-9.

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