A gas system, its control method, and a gas engine

Abstract

This invention provides a gas system, its control method, and a gas engine. Based on the monitored current operating conditions of the gas engine, the high-pressure regulating pipeline can be opened, thereby increasing the gas supply flow rate by adjusting the gas pressure to a first level. This allows the gas system to supply the required gas flow rate even under high engine load. Furthermore, based on the monitored current operating conditions of the gas engine, the high-pressure regulating pipeline can be closed, while the low-pressure regulating pipeline remains open to provide low-pressure gas. Since low-pressure gas is easier to control precisely, it can supply a high-precision gas flow rate even under low engine load. The gas system provided by this invention has a simple structure and low cost.

Description

Technical Field

[0001] This invention relates to the field of gas engine technology, and more specifically, to a gas system, its control method, and a gas engine. Background Technology

[0002] A gas turbine engine is an engine that uses natural gas as fuel. Due to the low density of natural gas, when an injection system injects natural gas into the cylinder, the limited injection duration necessitates the use of high-flow-rate gas nozzles to ensure sufficient power output. While high-flow-rate nozzles can guarantee the gas flow requirements of the engine under high loads, they also present the problem of inaccurate gas metering when the engine is under low loads and requires a smaller gas flow rate. Summary of the Invention

[0003] In view of this, the present invention provides a gas system and its control method and a gas engine, which effectively solves the technical problems existing in the prior art. The gas system can not only supply the required flow of gas when the gas engine is under high load, but also supply gas with high precision flow when the gas engine is under low load. The gas system has a simple structure and low cost.

[0004] To achieve the above objectives, the technical solution provided by the present invention is as follows:

[0005] A gas system for use in a gas engine, comprising:

[0006] A gas pipeline for transmitting gas, and the gas pipeline includes a first outlet and a second outlet.

[0007] A high-pressure regulating pipeline connected to the first output port is used to regulate the gas to a first gas pressure before outputting it.

[0008] A low-pressure regulating pipeline connected to the second output port is used to regulate the gas to a second gas pressure before outputting it, wherein the first gas pressure is greater than the second gas pressure.

[0009] The processor is connected to the high-pressure regulating line and the low-pressure regulating line. The processor is used to control the low-pressure regulating line to remain open during operation and to control the high-pressure regulating line to open or close according to the current operating condition of the gas engine.

[0010] Optionally, the high-pressure regulating pipeline includes: a high-pressure stabilizing valve connected to the first output port, and a high-pressure shut-off valve connected between the first output port and the high-pressure stabilizing valve;

[0011] The low-pressure regulating pipeline includes: a low-pressure stabilizing valve connected to the second output port, and a low-pressure shut-off valve connected between the second output port and the low-pressure stabilizing valve.

[0012] Optionally, the processor is used to determine the relationship between the required speed load and the load limit of the gas engine based on the monitored current operating condition of the gas engine, and control the high-pressure regulating pipeline to open or close.

[0013] Alternatively, the processor may determine the relationship between the required gas flow rate and the flow limit of the gas engine based on the monitored current operating condition of the gas engine, and control the high-pressure regulating pipeline to open or close.

[0014] Optionally, the current operating conditions of the gas engine include rapid rise and rapid fall under transient operating conditions, and rise and fall under steady-state operating conditions.

[0015] During the transient rapid increase in operating conditions, if the required speed load of the gas engine exceeds the first load limit, the high-pressure regulating pipeline is opened; or, during the transient rapid increase in operating conditions, if the required gas flow rate of the gas engine exceeds the first flow rate limit, the high-pressure regulating pipeline is opened.

[0016] During the transient operating condition and rapid descent, if the required speed load of the gas engine is less than the second load limit, the high-pressure regulating pipeline is shut off; or, during the transient operating condition and rapid descent, if the required gas flow rate of the gas engine is less than the second flow rate limit, the high-pressure regulating pipeline is shut off.

[0017] When the gas engine speed load required by the gas engine exceeds the third load limit during the transition from steady-state to high-pressure operation, the high-pressure regulating pipeline is opened; or, when the gas flow rate required by the gas engine exceeds the third flow rate limit during the transition from steady-state to high-pressure operation, the high-pressure regulating pipeline is opened.

[0018] When the steady-state operating condition decreases and the required speed load of the gas engine is less than the fourth load limit, the high-pressure regulating pipeline is shut off; or, when the steady-state operating condition decreases and the required gas flow rate of the gas engine is less than the fourth flow rate limit, the high-pressure regulating pipeline is shut off.

[0019] Optionally, the processor is further configured to detect whether there is a gas leak in the gas system during the power-on phase before the operation phase and / or the power-off phase after the operation phase; if so, control both the low-pressure regulating pipeline and the high-pressure regulating pipeline to be shut down.

[0020] The processor is also configured to determine that the gas engine is started during the power-on phase, and then skip the gas leak detection and enter the operation phase;

[0021] The processor is also used to detect whether the low-pressure regulating line and the high-pressure regulating line are faulty before detecting whether there is a gas leak in the gas system.

[0022] Optionally, the processor is further configured to control both the low-pressure regulating line and the high-pressure regulating line to shut down when a fault report is received;

[0023] The fault report includes the deployment of vehicle airbags.

[0024] Accordingly, the present invention also provides a control method for a gas system, for controlling the aforementioned gas system, the control method comprising:

[0025] Power on the gas system;

[0026] During operation, the low-pressure regulating line is kept open, and the high-pressure regulating line is opened or closed according to the current operating condition of the gas engine.

[0027] Optionally, controlling the opening or closing of the high-pressure regulating line based on the monitored current operating condition of the gas engine includes:

[0028] Based on the monitored current operating condition of the gas engine, determine the relationship between the required speed load and the load limit of the gas engine, and control the opening or closing of the high-pressure regulating pipeline.

[0029] Alternatively, based on the monitored current operating condition of the gas engine, the relationship between the required gas flow rate and the flow limit of the gas engine can be determined, and the high-pressure regulating pipeline can be opened or closed accordingly.

[0030] Optionally, the current operating conditions of the gas engine include rapid rise and rapid fall under transient operating conditions, and rise and fall under steady-state operating conditions.

[0031] During the transient rapid increase in operating conditions, if the required speed load of the gas engine exceeds the first load limit, the high-pressure regulating pipeline is opened; or, during the transient rapid increase in operating conditions, if the required gas flow rate of the gas engine exceeds the first flow rate limit, the high-pressure regulating pipeline is opened.

[0032] During the transient operating condition and rapid descent, if the required speed load of the gas engine is less than the second load limit, the high-pressure regulating pipeline is shut off; or, during the transient operating condition and rapid descent, if the required gas flow rate of the gas engine is less than the second flow rate limit, the high-pressure regulating pipeline is shut off.

[0033] When the gas engine speed load required by the gas engine exceeds the third load limit during the transition from steady-state to high-pressure operation, the high-pressure regulating pipeline is opened; or, when the gas flow rate required by the gas engine exceeds the third flow rate limit during the transition from steady-state to high-pressure operation, the high-pressure regulating pipeline is opened.

[0034] When the steady-state operating condition decreases and the required speed load of the gas engine is less than the fourth load limit, the high-pressure regulating pipeline is shut off; or, when the steady-state operating condition decreases and the required gas flow rate of the gas engine is less than the fourth flow rate limit, the high-pressure regulating pipeline is shut off.

[0035] Optionally, during the power-on phase before the operation phase and / or the power-off phase after the operation phase, the gas system is checked for gas leakage. If so, the low-pressure regulating pipeline and the high-pressure regulating pipeline are both shut off.

[0036] If the gas engine is determined to start during the power-on phase, the gas leak detection is skipped and the operation phase begins.

[0037] Before detecting whether there is a gas leak in the gas system, check whether there is a fault in the low-pressure regulating line and the high-pressure regulating line.

[0038] Optionally, the control method further includes:

[0039] Upon receiving a fault report, both the low-pressure regulating line and the high-pressure regulating line are shut off.

[0040] The fault report includes the deployment of vehicle airbags.

[0041] Accordingly, the present invention also provides a gas engine, which includes the gas system described above.

[0042] Compared with the prior art, the technical solution provided by the present invention has at least the following advantages:

[0043] This invention provides a gas system, its control method, and a gas engine, comprising: a gas pipeline for transmitting gas, the gas pipeline including a first output port and a second output port; a high-pressure regulating pipeline connected to the first output port, the high-pressure regulating pipeline for regulating the gas to a first gas pressure before output; a low-pressure regulating pipeline connected to the second output port, the low-pressure regulating pipeline for regulating the gas to a second gas pressure before output, wherein the first gas pressure is greater than the second gas pressure; and a processor connected to the high-pressure regulating pipeline and the low-pressure regulating pipeline, the processor being used to control the low-pressure regulating pipeline to remain open during operation, and to control the high-pressure regulating pipeline to open or close according to the monitored current operating condition of the gas engine.

[0044] As described above, the technical solution provided by this invention can control the opening of the high-pressure regulating pipeline based on the monitored current operating condition of the gas engine. This allows for increasing the supply flow rate by adjusting the gas pressure to a first level, enabling the gas system to supply the required gas flow rate even under high engine load. Furthermore, based on the monitored current operating condition of the gas engine, the high-pressure regulating pipeline can be shut off, while the low-pressure regulating pipeline remains open to provide low-pressure gas. Since low-pressure gas is easier to control precisely, it can supply a high-precision gas flow rate even under low engine load. The gas system provided by this invention has a simple structure and low cost. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0046] Figure 1 A schematic diagram of a gas system provided in an embodiment of the present invention;

[0047] Figure 2 This is a schematic diagram of another gas system provided in an embodiment of the present invention;

[0048] Figure 3 A flowchart of a gas system control method provided in an embodiment of the present invention;

[0049] Figure 4 A flowchart of another gas system control method provided in an embodiment of the present invention;

[0050] Figure 5 A flowchart of another gas system control method provided in an embodiment of the present invention. Detailed Implementation

[0051] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0052] As described in the background section, due to the low density of natural gas, when using an injection system to inject natural gas into the cylinder, the limited injection duration necessitates the use of high-flow-rate gas nozzles to ensure sufficient power output. While high-flow-rate nozzles can guarantee the gas flow requirements of the engine under high loads, they also present the problem of inaccurate gas metering when the engine requires low-flow-rate gas under low loads.

[0053] Based on this, embodiments of the present invention provide a gas system and its control method and a gas engine, which effectively solve the technical problems existing in the prior art. The gas system can not only supply the required flow of gas when the gas engine is under high load, but also supply high-precision flow of gas when the gas engine is under low load. The gas system has a simple structure and low cost.

[0054] To achieve the above objectives, the technical solutions provided by the embodiments of the present invention are as follows, in detail... Figures 1 to 5 The technical solutions provided in the embodiments of the present invention will be described in detail.

[0055] refer to Figure 1 The diagram shown is a structural schematic of a gas system provided in an embodiment of the present invention. The gas system is applied to a gas engine and includes:

[0056] A gas pipeline 100 is used to transmit gas, and the gas pipeline 100 includes a first outlet and a second outlet.

[0057] A high-pressure regulating pipeline 210 is connected to the first output port. The high-pressure regulating pipeline 210 is used to regulate the gas to a first gas pressure before outputting it.

[0058] A low-pressure regulating pipeline 220 connected to the second output port is used to regulate the gas to a second gas pressure before outputting it, wherein the first gas pressure is greater than the second gas pressure.

[0059] The processor 300 is connected to the high-pressure regulating line 210 and the low-pressure regulating line 220. The processor 300 is used to control the low-pressure regulating line 220 to remain open during operation and to control the high-pressure regulating line 210 to open or close according to the current operating condition of the gas engine.

[0060] Continue as Figure 1 As shown, the gas engine provided in this embodiment of the invention further includes a gas filter 400, a gas rail assembly 500, an injection valve 600, and a temperature and pressure sensor 700. The gas filter 400 is connected to the output side of the high-pressure regulating line 210 and the low-pressure regulating line 220, and is used to filter impurities from the gas output from the high-pressure regulating line 210 and the low-pressure regulating line 220 before outputting the gas to the gas rail assembly 500 connected to the gas filter 400. The gas rail assembly 500 stabilizes the gas pressure and outputs it to the connected injection valve 600, which then transmits the gas to the connected nozzle. The temperature and pressure sensor 700 is connected to the gas rail assembly 500 and is used to detect and control the temperature and pressure of the gas rail assembly 500.

[0061] It should be noted that the operating stage provided in this embodiment of the invention refers to the stage after the gas engine starts. Also, the injection valves provided in this embodiment of the invention may include multiple valves, meaning the gas engine provided in this embodiment of the invention can use a multi-point injection method to transmit gas into the cylinder; this invention does not impose specific limitations on this. Furthermore, this embodiment of the invention does not impose specific limitations on the values ​​of the first and second gas pressures; specific design is required based on actual applications.

[0062] As described above, the technical solution provided by this invention can control the opening of the high-pressure regulating pipeline based on the monitored current operating condition of the gas engine. This allows for increasing the supply flow rate by adjusting the gas pressure to a first level, enabling the gas system to supply the required gas flow rate when the gas engine is under high load. Furthermore, based on the monitored current operating condition of the gas engine, the high-pressure regulating pipeline can be shut off, while the low-pressure regulating pipeline remains open to provide low-pressure gas. Since low-pressure gas is easier to control precisely, it can supply a high-precision gas flow rate when the gas engine is under low load. The gas system provided by this invention has a simple structure and low cost.

[0063] refer to Figure 2 The diagram shown is a structural schematic of another gas system provided in an embodiment of the present invention. The high-pressure regulating pipeline provided in this embodiment of the present invention includes: a high-pressure stabilizing valve 211 connected to the first output port, and a high-pressure shut-off valve 212 connected between the first output port and the high-pressure stabilizing valve 211.

[0064] The low-pressure regulating pipeline includes: a low-pressure stabilizing valve 221 connected to the second output port, and a low-pressure shut-off valve 222 connected between the second output port and the low-pressure stabilizing valve 221.

[0065] It is understood that the high-pressure regulating valve, high-pressure shut-off valve, low-pressure regulating valve, and low-pressure shut-off valve provided in this embodiment of the invention can all be electronic valves electrically connected to the processor. Specifically, when controlling the low-pressure regulating pipeline, the processor controls the low-pressure shut-off valve to open, transferring the gas supplied by the gas pipeline to the low-pressure regulating valve. The processor then controls the low-pressure regulating valve to adjust the gas pressure to a second pressure, thereby achieving precise control of the gas flow rate by outputting gas at a lower pressure. Conversely, when the high-pressure regulating pipeline needs to operate, the processor controls the high-pressure shut-off valve to open, transferring the gas supplied by the gas pipeline to the high-pressure regulating valve. The processor then controls the high-pressure regulating valve to adjust the gas pressure to a first pressure before outputting it, thereby increasing the gas flow rate to the nozzle by adjusting the pressure to a first pressure greater than the second pressure.

[0066] Alternatively, the high-pressure regulating valve and low-pressure regulating valve provided in this embodiment of the invention are mechanical valves, while the high-pressure shut-off valve and low-pressure shut-off valve are electronic valves electrically connected to the processor. In the control chamber of the gas pressure regulating pipeline, the processor controls the low-pressure shut-off valve to open, transferring the gas supplied by the gas pipeline to the low-pressure regulating valve. The low-pressure regulating valve operates according to a pre-set mechanical function, regulating the gas to a second pressure. This achieves precise control of the gas flow rate by outputting gas at a lower pressure. Furthermore, when the high-pressure regulating pipeline needs to operate, the processor controls the high-pressure shut-off valve to open, transferring the gas supplied by the gas pipeline to the high-pressure regulating valve. The high-pressure regulating valve operates according to a pre-set mechanical function, regulating the gas to a first pressure before outputting it. This increases the gas flow rate to the nozzle by adjusting the gas pressure to a first pressure greater than the second pressure.

[0067] In one embodiment of the present invention, the processor provided in this embodiment, when monitoring the current operating condition of the gas engine, can control the high-pressure regulating pipeline by referring to the engine's speed load or required gas flow rate. That is, the processor provided in this embodiment is used to determine the relationship between the required speed load and the load limit of the gas engine based on the monitored current operating condition of the gas engine, and then control the high-pressure regulating pipeline to open or close. Alternatively, the processor is used to determine the relationship between the required gas flow rate and the flow limit of the gas engine based on the monitored current operating condition of the gas engine, and then control the high-pressure regulating pipeline to open or close.

[0068] Specifically, the current operating conditions of the gas engine provided in the embodiments of the present invention include rapid rise and rapid fall under transient operating conditions, and rise and fall under steady-state operating conditions.

[0069] During the transient rapid increase in operating conditions, if the required speed load of the gas engine exceeds the first load limit, the high-pressure regulating pipeline is opened; or, during the transient rapid increase in operating conditions, if the required gas flow rate of the gas engine exceeds the first flow rate limit, the high-pressure regulating pipeline is opened.

[0070] During the transient operating condition with a rapid drop in operating conditions, if the required speed load of the gas engine is less than the second load limit, the high-pressure regulating pipeline is controlled to shut off; or, during the transient operating condition with a rapid drop in operating conditions, if the required gas flow rate of the gas engine is less than the second flow rate limit, the high-pressure regulating pipeline is controlled to shut off.

[0071] When the gas engine is upgraded from steady-state operating condition to operating condition, if the required speed load of the gas engine is greater than the third load limit, the high-pressure regulating pipeline is controlled to open; or, when the gas engine is upgraded from steady-state operating condition to operating condition, if the required gas flow rate of the gas engine is greater than the third flow rate limit, the high-pressure regulating pipeline is controlled to open.

[0072] When the steady-state operating condition decreases and the required speed load of the gas engine is less than the fourth load limit, the high-pressure regulating pipeline is shut off; or, when the steady-state operating condition decreases and the required gas flow rate of the gas engine is less than the fourth flow rate limit, the high-pressure regulating pipeline is shut off.

[0073] It is understood that the gas engine provided in the embodiments of the present invention can control the opening and closing of the high-pressure regulating pipeline under different operating conditions, thereby achieving precise control of the high-pressure regulating pipeline and ensuring that the gas system can supply the required flow of gas when the gas engine is under high load, and can also supply high-precision flow of gas when the gas engine is under low load.

[0074] Furthermore, the processor provided in this embodiment of the invention is also used to detect whether there is a gas leak in the gas system during the power-on phase before the operation phase and / or the power-off phase after the operation phase. If so, it controls both the low-pressure regulating pipeline and the high-pressure regulating pipeline to be shut down. It is understood that the power-on phase provided in this embodiment of the invention is the phase of powering on the gas system while the gas engine is not started; that is, the power-off phase is the phase of powering off the gas system while the gas engine is off. Specifically, during the power-on and / or power-off phases of the gas system, gas leaks can be detected to improve the safety of the gas engine. Specifically, the high-pressure regulating pipeline and the low-pressure regulating pipeline can be filled with gas through the gas pipeline. After filling is complete, the gas pipeline filling is disconnected to enter a pressure holding test. The gas leak is determined based on the pressure holding test results. Optionally, gas leaks can be determined based on the detection data of the gas rail pressure assembly by temperature and pressure sensors. That is, if the rail pressure detected by the temperature and pressure sensors is within the set range, it is determined that the filling is complete and the pressure holding test is started. If the rail pressure drop or the pressure drop rate is greater than the limit per unit time, it is determined that there is a gas leak in the gas system.

[0075] Optionally, the technical solution provided in this embodiment of the invention can, after determining that there is no gas leakage in the gas system and before the gas engine is started, control the low-pressure regulating pipeline to open and control the high-pressure regulating pipeline to close; or control the low-pressure regulating pipeline and the high-pressure regulating pipeline to open simultaneously to improve the gas charging efficiency, and control the high-pressure regulating pipeline to close when the gas engine is started.

[0076] The present invention provides a method for determining gas leaks before performing fault checks on the high-pressure and low-pressure regulating pipelines, thus avoiding misjudgments of gas leaks due to pipeline malfunctions. Specifically, the processor is further configured to detect faults in the low-pressure and high-pressure regulating pipelines before detecting gas leaks in the gas system. This can be achieved based on data from temperature and pressure sensors on the gas rail pressure assembly. When the regulating pipeline includes a pressure regulating valve and a shut-off valve, a fault in the pressure regulating valve is determined when the rail pressure detected by the temperature and pressure sensors is higher than a limit; and a fault in the shut-off valve or insufficient gas supply is determined when the rail pressure detected by the temperature and pressure sensors is lower than a limit, thereby determining whether the regulating pipeline is faulty.

[0077] In one embodiment of the present invention, the processor provided in this embodiment is further configured to determine that the gas engine is started during the power-on phase, and then skip the gas leak detection and enter the operation phase to avoid the vehicle stopping due to lack of gas supply when starting the vehicle.

[0078] Furthermore, the processor provided in this embodiment of the invention is also used to control both the low-pressure regulating pipeline and the high-pressure regulating pipeline to shut down when a fault report is received; the fault report includes the deployment of the vehicle's airbag.

[0079] It is understood that the gas system provided in this embodiment of the invention can be applied to vehicles. When malfunctions such as airbag deployment occur, the low-pressure regulating pipeline and the high-pressure regulating pipeline can be shut off in a timely manner to improve the safety of the gas system. It should be noted that some fault types in the fault report provided in this embodiment of the invention, such as airbag deployment, can be detected at any stage after the system is powered on. This embodiment of the invention does not impose specific limitations on the timing of fault detection.

[0080] Accordingly, embodiments of the present invention also provide a control method for a gas system, used to control the gas system provided in any of the above embodiments. (See reference) Figure 3 The diagram shows a flowchart of a gas system control method provided in an embodiment of the present invention, wherein the control method includes:

[0081] S1. Power on the gas system.

[0082] S2. During operation, the low-pressure regulating pipeline is kept open, and the high-pressure regulating pipeline is opened or closed according to the current operating condition of the gas engine.

[0083] In one embodiment of the present invention, the control method provided by the present invention can control the high-pressure regulating pipeline by referring to the engine speed load or required gas flow rate when monitoring the current operating condition of the gas engine. That is, the control method provided by the present invention controls the opening or closing of the high-pressure regulating pipeline according to the monitored current operating condition of the gas engine, including:

[0084] Based on the monitored current operating condition of the gas engine, determine the relationship between the required speed load and the load limit of the gas engine, and control the opening or closing of the high-pressure regulating pipeline. Alternatively, based on the monitored current operating condition of the gas engine, determine the relationship between the required gas flow rate and the flow limit of the gas engine, and control the opening or closing of the high-pressure regulating pipeline.

[0085] For details, please refer to the following: Figure 4 The diagram shows a flowchart of another gas system control method provided in an embodiment of the present invention, wherein step S2 includes:

[0086] S21. Control the low-pressure regulating pipeline to maintain a normally open output.

[0087] S22. Monitor the current operating condition of the gas engine. The current operating condition of the gas engine includes transient conditions such as rapid acceleration and rapid deceleration, and steady-state conditions such as acceleration and deceleration.

[0088] During the transient rapid increase in operating conditions, if the required speed load of the gas engine exceeds the first load limit, the high-pressure regulating pipeline is opened; or, during the transient rapid increase in operating conditions, if the required gas flow rate of the gas engine exceeds the first flow rate limit, the high-pressure regulating pipeline is opened.

[0089] During the transient operating condition with a rapid drop in operating conditions, if the required speed load of the gas engine is less than the second load limit, the high-pressure regulating pipeline is controlled to shut off; or, during the transient operating condition with a rapid drop in operating conditions, if the required gas flow rate of the gas engine is less than the second flow rate limit, the high-pressure regulating pipeline is controlled to shut off.

[0090] When the gas engine is upgraded from steady-state operating condition to operating condition, if the required speed load of the gas engine is greater than the third load limit, the high-pressure regulating pipeline is controlled to open; or, when the gas engine is upgraded from steady-state operating condition to operating condition, if the required gas flow rate of the gas engine is greater than the third flow rate limit, the high-pressure regulating pipeline is controlled to open.

[0091] When the steady-state operating condition decreases and the required speed load of the gas engine is less than the fourth load limit, the high-pressure regulating pipeline is shut off; or, when the steady-state operating condition decreases and the required gas flow rate of the gas engine is less than the fourth flow rate limit, the high-pressure regulating pipeline is shut off.

[0092] It should be noted that the embodiments of the present invention do not impose specific restrictions on the specific values ​​of the first load limit to the fourth load limit and the first flow limit to the fourth flow limit, and specific analysis and calculation are required based on the actual application.

[0093] It is understood that the gas engine provided in the embodiments of the present invention can control the opening and closing of the high-pressure regulating pipeline under different operating conditions, thereby achieving precise control of the high-pressure regulating pipeline and ensuring that the gas system can supply the required flow of gas when the gas engine is under high load, and can also supply high-precision flow of gas when the gas engine is under low load.

[0094] Furthermore, the technical solution provided in this embodiment of the invention can detect whether there is a gas leak in the gas system during the power-on phase before the operation phase and / or the power-off phase after the operation phase. If so, the low-pressure regulating pipeline and the high-pressure regulating pipeline are both shut off. It is understood that the power-on phase provided in this embodiment of the invention is the phase of powering on the gas system while the gas engine is not running; that is, the power-off phase is the phase of powering off the gas system while the gas engine is off. Specifically, during the power-on and / or power-off phases of the gas system, gas leaks can be detected to improve the safety of the gas engine. Specifically, the high-pressure regulating pipeline and the low-pressure regulating pipeline can be filled with gas through the gas pipeline. After filling is complete, the gas pipeline filling is disconnected to enter a pressure holding test. The gas leak is determined based on the pressure holding test results. Optionally, gas leaks can be determined based on the detection data of the gas rail pressure assembly by temperature and pressure sensors. That is, if the rail pressure detected by the temperature and pressure sensors is within the set range, it is determined that the filling is complete and the pressure holding test is started. If the rail pressure drop or the pressure drop rate is greater than the limit per unit time, it is determined that there is a gas leak in the gas system.

[0095] Optionally, the technical solution provided in this embodiment of the invention can, after determining that there is no gas leakage in the gas system and before the gas engine is started, control the low-pressure regulating pipeline to open and control the high-pressure regulating pipeline to close; or control the low-pressure regulating pipeline and the high-pressure regulating pipeline to open simultaneously to improve the gas charging efficiency, and control the high-pressure regulating pipeline to close when the gas engine is started.

[0096] The present invention provides a method for determining gas leaks by checking for faults in the high-pressure and low-pressure regulating pipelines before detection, thus avoiding misjudgments of gas leaks due to pipeline malfunctions. Specifically, before detecting a gas leak in the gas system, the low-pressure and high-pressure regulating pipelines are checked for faults. This can be done based on data from temperature and pressure sensors on the gas rail pressure assembly. If the regulating pipeline includes a pressure regulating valve and a shut-off valve, a fault in the pressure regulating valve is determined when the rail pressure detected by the temperature and pressure sensors is higher than a limit; conversely, a fault in the shut-off valve or insufficient gas supply is determined when the rail pressure detected by the temperature and pressure sensors is lower than a limit. This method thus determines whether the regulating pipeline is faulty.

[0097] In one embodiment of the present invention, the technical solution provided by the present invention determines that the gas engine is started during the power-on phase, and then skips the gas leak detection and enters the operation phase, thereby avoiding the situation where the vehicle stops due to the lack of gas supply when starting the vehicle.

[0098] Furthermore, the control method provided in this embodiment of the invention further includes: upon receiving a fault report, controlling both the low-pressure regulating pipeline and the high-pressure regulating pipeline to shut down; the fault report includes the deployment of the vehicle's airbag.

[0099] It is understood that the gas system provided in this embodiment of the invention can be applied to vehicles. When malfunctions such as airbag deployment occur, the low-pressure regulating pipeline and the high-pressure regulating pipeline can be shut off in a timely manner to improve the safety of the gas system. It should be noted that some fault types in the fault report provided in this embodiment of the invention, such as airbag deployment, can be detected at any stage after the system is powered on. This embodiment of the invention does not impose specific limitations on the timing of fault detection.

[0100] For details, please refer to the following: Figure 5 The diagram shows a flowchart of another gas system control method provided by an embodiment of the present invention. This embodiment uses gas leak detection during the power-on phase as an example for illustration. Specifically, the gas leak detection provided by this embodiment can be performed after the gas system is powered on, that is, after the gas system is powered on, it includes:

[0101] S11. Charge the high-pressure regulating line and the low-pressure regulating line with gas. For example, the high-pressure shut-off valve and the low-pressure shut-off valve can be connected to the gas line to charge the high-pressure regulating line and the low-pressure regulating line with gas.

[0102] S12. Disconnect the gas supply to the high-pressure regulating line and the low-pressure regulating line, and perform a pressure holding test. Alternatively, disconnect the high-pressure shut-off valve and the low-pressure shut-off valve from the gas line to perform the pressure holding test.

[0103] S13. Determine if there is a gas leak. If so, close the high-pressure regulating line and the low-pressure regulating line. If not, proceed to S14 to start the gas engine, and then keep the low-pressure regulating line open.

[0104] Continue to refer to Figure 5 As shown, when the gas system is powered on and the gas engine is started, the gas leak detection is skipped and the process proceeds directly to step S14 to start the gas engine, thus avoiding situations where there is no gas supply or the gas supply is not timely when the gas engine is started.

[0105] Furthermore, the control method provided in this embodiment of the invention also includes S15, receiving other fault reports besides gas leaks. This type of fault can be detected at any time during the operation of vehicles, etc., and this embodiment of the invention does not impose specific limitations.

[0106] Accordingly, embodiments of the present invention also provide a gas engine, the gas engine including the gas system provided in any of the above embodiments.

[0107] This invention provides a gas system, its control method, and a gas engine, comprising: a gas pipeline for transmitting gas, the gas pipeline including a first output port and a second output port; a high-pressure regulating pipeline connected to the first output port, the high-pressure regulating pipeline for regulating the gas to a first gas pressure before output; a low-pressure regulating pipeline connected to the second output port, the low-pressure regulating pipeline for regulating the gas to a second gas pressure before output, wherein the first gas pressure is greater than the second gas pressure; and a processor connected to the high-pressure regulating pipeline and the low-pressure regulating pipeline, the processor controlling the low-pressure regulating pipeline to remain normally open, and controlling the high-pressure regulating pipeline to open or close according to the monitored current operating condition of the gas engine.

[0108] As described above, the technical solution provided by this invention can control the opening of the high-pressure regulating pipeline based on the monitored current operating condition of the gas engine. This allows for increasing the supply flow rate by adjusting the gas pressure to a first level, enabling the gas system to supply the required gas flow rate when the gas engine is under high load. Furthermore, based on the monitored current operating condition of the gas engine, the high-pressure regulating pipeline can be shut off, while the low-pressure regulating pipeline remains open to provide low-pressure gas. Since low-pressure gas is easier to control precisely, it can supply a high-precision gas flow rate when the gas engine is under low load. The gas system provided by this invention has a simple structure and low cost.

[0109] In the description of this invention, it should be understood that terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0110] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0111] In this invention, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0112] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0113] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0114] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A gas system applied to a gas engine, characterized in that, include: A gas pipeline for transmitting gas, and the gas pipeline includes a first outlet and a second outlet. A high-pressure regulating pipeline connected to the first output port is used to regulate the gas to a first gas pressure before outputting it. A low-pressure regulating pipeline connected to the second output port is used to regulate the gas to a second gas pressure before outputting it, wherein the first gas pressure is greater than the second gas pressure. The processor is connected to the high-pressure regulating line and the low-pressure regulating line. The processor is used to control the low-pressure regulating line to remain open during operation and to control the high-pressure regulating line to open or close according to the current operating condition of the gas engine. The processor is used to determine the relationship between the required speed load and the load limit of the gas engine based on the monitored current operating condition of the gas engine, and control the high-pressure regulating pipeline to open or close; or, the processor is used to determine the relationship between the required gas flow rate and the flow limit of the gas engine based on the monitored current operating condition of the gas engine, and control the high-pressure regulating pipeline to open or close. The current operating conditions of the gas engine include rapid rise and rapid fall under transient operating conditions, and rise and fall under steady-state operating conditions. During the transient rapid increase in operating conditions, if the required speed load of the gas engine exceeds the first load limit, the high-pressure regulating pipeline is opened. Alternatively, during the rapid increase in operating conditions under the transient conditions, if the gas flow rate required by the gas engine exceeds the first flow rate limit, the high-pressure regulating pipeline is controlled to open. During the rapid drop in transient operating conditions, when the required speed load of the gas engine is less than the second load limit, the high-pressure regulating pipeline is shut off. Alternatively, during the rapid descent condition under the transient operating condition, if the gas flow required by the gas engine is less than the second flow limit, the high-pressure regulating pipeline is controlled to be shut off. When the gas engine speed load required by the gas engine exceeds the third load limit during the transition from steady-state to peak operating conditions, the high-pressure regulating pipeline is opened. Alternatively, when the gas flow rate required by the gas engine exceeds the third flow limit during the transition from steady-state to high-state operation, the high-pressure regulating pipeline is opened. When the steady-state operating condition decreases, and the required speed load of the gas engine is less than the fourth load limit, the high-pressure regulating pipeline is controlled to be shut off. Alternatively, when the gas flow rate required by the gas engine is less than the fourth flow limit during the decrease of the steady-state operating condition, the high-pressure regulating pipeline is controlled to be shut off.

2. The gas system according to claim 1, characterized in that, The high-pressure regulating pipeline includes: a high-pressure stabilizing valve connected to the first output port, and a high-pressure shut-off valve connected between the first output port and the high-pressure stabilizing valve; The low-pressure regulating pipeline includes: a low-pressure stabilizing valve connected to the second output port, and a low-pressure shut-off valve connected between the second output port and the low-pressure stabilizing valve.

3. The gas system according to claim 1, characterized in that, The processor is also configured to detect whether there is a gas leak in the gas system during the power-on phase before the operation phase and / or the power-off phase after the operation phase; if so, control both the low-pressure regulating pipeline and the high-pressure regulating pipeline to shut down. The processor is also configured to determine that the gas engine is started during the power-on phase, and then skip the gas leak detection and enter the operation phase; The processor is also used to detect whether the low-pressure regulating line and the high-pressure regulating line are faulty before detecting whether there is a gas leak in the gas system.

4. The gas system according to claim 1, characterized in that, The processor is also configured to, upon receiving a fault report, control both the low-pressure regulating pipeline and the high-pressure regulating pipeline to shut down. The fault report includes the deployment of vehicle airbags.

5. A control method for a gas system, characterized in that, For controlling the gas system according to any one of claims 1-4, the control method includes: Power on the gas system; During operation, the low-pressure regulating line is kept open, and the high-pressure regulating line is opened or closed according to the current operating condition of the gas engine.

6. The control method for a gas system according to claim 5, characterized in that, Controlling the opening or closing of the high-pressure regulating pipeline based on the monitored current operating condition of the gas engine includes: Based on the monitored current operating condition of the gas engine, determine the relationship between the required speed load and the load limit of the gas engine, and control the opening or closing of the high-pressure regulating pipeline. Alternatively, based on the monitored current operating condition of the gas engine, the relationship between the required gas flow rate and the flow limit of the gas engine can be determined, and the high-pressure regulating pipeline can be opened or closed accordingly.

7. The control method for a gas system according to claim 6, characterized in that, During the power-on phase before the operation phase and / or the power-off phase after the operation phase, the gas system is checked for gas leakage. If so, the low-pressure regulating pipeline and the high-pressure regulating pipeline are both shut off. If the gas engine is determined to start during the power-on phase, the gas leak detection is skipped and the operation phase begins. Before detecting whether there is a gas leak in the gas system, check whether there is a fault in the low-pressure regulating line and the high-pressure regulating line.

8. The control method for a gas system according to claim 6, characterized in that, The control method further includes: Upon receiving a fault report, both the low-pressure regulating line and the high-pressure regulating line are shut off. The fault report includes the deployment of vehicle airbags.

9. A gas-fired engine, characterized in that, The gas engine includes the gas system as described in any one of claims 1-4.

Images