A control method of a fuel gas system, a fuel gas system and a vehicle

Abstract

This application provides a control method for a gas system, a gas system, and a vehicle. The method acquires ambient temperature, gas temperature, and pressure. When the ambient temperature is higher than a preset ambient temperature threshold, the method controls the start / stop operation of a booster device based on the relationship between a first gas temperature limit threshold and the gas temperature, and the relationship between a first gas pressure threshold and the gas pressure, all within a first set of protection parameters. When the ambient temperature is lower than or equal to the preset ambient temperature threshold, the method controls the start / stop operation of the booster device based on the relationship between a second gas temperature limit threshold and the gas temperature, and the relationship between a second gas pressure threshold and the gas pressure, all within a second set of protection parameters. This allows for differentiated low-temperature protection of the gas system using different sets of protection parameters based on different ambient temperatures. This solves problems such as leakage, gas leakage, or freezing of the vaporizer caused by low-temperature failure of system seals due to excessively low medium temperature in low-temperature environments, thus improving the system's low-temperature reliability and environmental adaptability.

Description

Technical Field

[0001] This application relates to the field of engine control technology, specifically to a control method for a gas system, a gas system, and a vehicle. Background Technology

[0002] In a gas supply system that includes a booster and a vaporizer, it is typically necessary to maintain stable pressure and temperature of the output gas to ensure reliable operation of downstream engines. Under normal temperature conditions, the vaporizer has sufficient vaporization capacity, and the temperature of the gas output from the system remains relatively stable, preventing extremely low temperatures. However, in extremely cold environments, the vaporizer's vaporization capacity decreases, and the continuous operation of the booster causes the gas output temperature to drop continuously. This can lead to leaks due to low-temperature failure of seals, or even freezing of the vaporizer, thus affecting the normal operation of the gas supply system. Summary of the Invention

[0003] In view of this, this application aims to provide a control method for a gas system, a gas system, and a vehicle to solve the problem that low gas temperature may cause system damage in conventional related technologies.

[0004] The first aspect of this application provides a control method for a gas system, the gas system including a pressurizing device and a gasification device, wherein the pressurizing device is used to pressurize low-pressure liquid fuel and output it to the gasification device, and the gasification device is used to gasify the pressurized liquid fuel and output gas. The control method includes: Obtain ambient temperature, gas temperature, and gas pressure; When the ambient temperature is higher than the preset ambient temperature threshold, the start and stop of the booster device are controlled based on the relationship between the first gas temperature limit threshold and the gas temperature, and the relationship between the first gas pressure threshold and the gas pressure in the first protection parameter set. When the ambient temperature is lower than or equal to the preset ambient temperature threshold, the start and stop of the booster device are controlled based on the relationship between the second gas temperature limit threshold and the gas temperature, and the relationship between the second gas pressure threshold and the gas pressure in the second protection parameter set. The second gas temperature limit threshold corresponding to any gas temperature is less than the first gas temperature limit threshold corresponding to that gas temperature.

[0005] In one possible implementation of this application, when the ambient temperature is higher than a preset ambient temperature threshold, the start-up and shutdown of the booster device are controlled based on the relationship between a first gas temperature limit threshold and the gas temperature, and the relationship between a first gas pressure threshold and the gas pressure, as set in the first protection parameter set. This includes: When the ambient temperature is higher than the preset ambient temperature threshold, the first gas temperature limit threshold and the first gas pressure threshold in the first protection parameter set are obtained. If the gas temperature is lower than the first gas temperature limit threshold, the booster device is controlled to stop working, and after the booster device stops working, it is determined whether the current gas pressure is lower than the first gas pressure threshold. If the current gas pressure is lower than the first gas pressure threshold, the booster device is controlled to perform a booster operation.

[0006] In one possible implementation of this application, the first protection parameter set further includes: a first confirmation time; If the gas temperature is lower than the first gas temperature limit threshold, controlling the booster device to stop working includes: If the duration of the gas temperature being lower than the first gas temperature limit threshold reaches the first confirmation time, the booster device is controlled to stop working.

[0007] In one possible implementation of this application, the first set of protection parameters further includes: a first waiting time; After the booster device stops working, it is determined whether the current gas pressure is lower than the first gas pressure threshold. If the current gas pressure is lower than the first gas pressure threshold, the booster device is controlled to perform a boosting operation, including: After the booster device stops working, it is determined whether the stop time has reached the first waiting time; If the stop working time reaches the first waiting time, determine whether the current gas pressure is lower than the first gas pressure threshold. If the current gas pressure is lower than the first gas pressure threshold, the booster device is controlled to perform a booster operation.

[0008] In one possible implementation of this application, the first protection parameter set further includes: a first gas temperature reset threshold and a first reset confirmation time; after the booster device stops working, the control method further includes: Determine whether the current gas temperature is higher than the first gas temperature reset threshold; If the current gas temperature is higher than the first gas temperature reset threshold and the duration reaches the first reset confirmation time, the booster device is controlled to operate normally.

[0009] In one possible implementation of this application, when the ambient temperature is lower than or equal to the preset ambient temperature threshold, the start-up and shutdown of the booster device are controlled based on the relationship between the second gas temperature limit threshold and the gas temperature, and the relationship between the second gas pressure threshold and the gas pressure, as set in the second protection parameter set. This includes: When the ambient temperature is lower than or equal to the preset ambient temperature threshold, the second gas temperature limit threshold and the second gas pressure threshold in the second protection parameter set are obtained. If the gas temperature is lower than the second gas temperature limit threshold, the booster device is controlled to stop working, and after the booster device stops working, it is determined whether the current gas pressure is lower than the second gas pressure threshold. If the current gas pressure is lower than the second gas pressure threshold, the booster device is controlled to perform a booster operation.

[0010] In one possible implementation of this application, the second protection parameter set further includes: a second waiting time; after the booster device stops working, determining whether the current gas pressure is lower than a second gas pressure threshold; if the current gas pressure is lower than the second gas pressure threshold, controlling the booster device to perform a booster operation, including: After the booster device stops working, it is determined whether the stop time has reached the second waiting time; If the stop working time reaches the second waiting time, determine whether the current gas pressure is lower than the second gas pressure threshold. If the current gas pressure is lower than the second gas pressure threshold, the booster device is controlled to perform a booster operation.

[0011] In one possible implementation of this application, the second protection parameter set further includes: a second gas temperature reset threshold and a second reset confirmation time; the control method further includes: Determine whether the current gas temperature is higher than the second gas temperature reset threshold; If the current gas temperature is higher than the second gas temperature reset threshold and the duration reaches the second reset confirmation time, the booster device is controlled to operate normally.

[0012] A second aspect of this application also provides a gas system, which includes a pressurizing device, a gasification device, and a main control module. The pressurizing device is used to pressurize low-pressure liquid fuel and output it to the gasification device. The gasification device is used to gasify the pressurized liquid fuel and output gas. The main control module is used to execute the control method of the gas system described in the first aspect.

[0013] A third aspect of this application also provides a vehicle including the gas system described in the second aspect.

[0014] A third aspect of this application provides an electronic device comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores a computer program executable by the at least one processor, the computer program being executed by the at least one processor to cause the at least one processor to perform a control method for a gas system as described in the first aspect.

[0015] The fourth aspect of this application provides a computer storage medium storing computer-executable instructions, which, when executed by a processor, are used to implement the first aspect and the control method of the combustible gas system of the first aspect.

[0016] The fifth aspect of this application provides a computer program product, comprising: a computer program that, when executed by a processor, implements the control method of the gas system as described in the first aspect.

[0017] This application provides a control method for a gas system, a gas system, and a vehicle. The method acquires ambient temperature, gas temperature, and gas pressure. When the ambient temperature is higher than a preset ambient temperature threshold, the method controls the start / stop of a booster device based on the relationship between a first gas temperature limit threshold and the gas temperature, and the relationship between a first gas pressure threshold and the gas pressure, all within a first set of protection parameters. When the ambient temperature is lower than or equal to the preset ambient temperature threshold, the method controls the start / stop of the booster device based on the relationship between a second gas temperature limit threshold and the gas temperature, and the relationship between a second gas pressure threshold and the gas pressure, all within a second set of protection parameters. This allows for differentiated low-temperature protection of the gas supply system using different sets of protection parameters for different ambient temperatures. It also solves problems such as leakage, gas leakage, or freezing of the vaporizer caused by low-temperature failure of system seals due to excessively low medium temperature in low-temperature environments, thus improving the system's low-temperature reliability and environmental adaptability. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this application, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram illustrating an application scenario of the gas system control method provided in the embodiments of this application.

[0020] Figure 2 A flowchart illustrating the control method for a gas system provided in this application embodiment. Figure 1 .

[0021] Figure 3 A flowchart illustrating the control method for a gas system provided in this application embodiment. Figure 2 .

[0022] Figure 4 This is a schematic diagram of the control system of the gas system provided in an embodiment of this application.

[0023] Figure 5 This is a schematic diagram of the hardware structure of the electronic device provided in the embodiments of this application. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] In gas supply systems, such as dual-fuel engines that require high-pressure gas supply (i.e., engines that simultaneously burn diesel and high-pressure liquid or gaseous fuels), high-pressure gas is pressurized by an LNG booster pump on a dedicated LNG (Liquefied Natural Gas) cylinder and then vaporized by a carburetor. In extremely cold environments, the antifreeze temperature is low when the engine is cold, and the carburetor's vaporization capacity is limited. Continuous operation of the LNG booster pump in such conditions can lead to excessively low temperatures in the output medium, causing leaks in the high-pressure gas supply system due to low-temperature seal failure, or freezing of the carburetor, rendering the dual-fuel engine unable to operate normally.

[0026] Based on this, this application proposes the following inventive concept: acquiring ambient temperature, gas temperature, and gas pressure; when the ambient temperature is higher than a preset ambient temperature threshold, controlling the start and stop of the booster device based on the relationship between a first gas temperature limit threshold and the gas temperature, and the relationship between a first gas pressure threshold and the gas pressure, all within a first set of protection parameters; when the ambient temperature is lower than or equal to the preset ambient temperature threshold, controlling the start and stop of the booster device based on the relationship between a second gas temperature limit threshold and the gas temperature, and the relationship between a second gas pressure threshold and the gas pressure, all within a second set of protection parameters, wherein the second gas temperature limit threshold corresponding to any gas temperature is less than the first gas temperature limit threshold corresponding to that gas temperature. Thus, different sets of protection parameters are used to provide differentiated low-temperature protection for the gas supply system according to different ambient temperatures, simultaneously solving problems such as leakage, gas leakage, or freezing of the vaporizer caused by low-temperature failure of system seals due to excessively low medium temperature in low-temperature environments, thereby improving the system's low-temperature reliability and environmental adaptability.

[0027] Before describing the specific implementation methods, we will first explain the system environment in which this application is applied. Figure 1 This is a schematic diagram illustrating an application scenario of the gas system control method provided in this application embodiment. (Reference) Figure 1 This scenario includes: an LNG cylinder 10, an LNG booster pump 20, a vaporizer (VAP) 30, and an engine 40. LNG in the cylinder 10 is pressurized by the LNG booster pump 20 from low pressure to high pressure, and then vaporized by the vaporizer 30 to output high-pressure gaseous natural gas, which is ultimately supplied to the engine 40. The vaporizer 30 uses antifreeze from the engine 40 as the vaporization medium. The internal temperature of the LNG cylinder 10 is extremely low (LNG temperature is approximately -162°C at normal pressure). Each time the LNG booster pump 20 operates, the temperature of the high-pressure gas output decreases to varying degrees. In extremely cold environments, the vaporization capacity of the vaporizer 30 decreases, and the continuous operation of the LNG booster pump 20 leads to a continuous decrease in the system's output gas temperature. Therefore, this embodiment uses an engine electronic control unit to monitor the ambient temperature, gas temperature, and gas pressure in real time to execute the control and protection logic described in subsequent embodiments.

[0028] Exemplary methods Figure 2 A flowchart illustrating the control method for a gas system provided in this application embodiment. Figure 1 The executing entity in this embodiment can be a controller, such as a standalone controller or an engine electronic control unit. The gas system includes a pressurizing device and a vaporization device. The pressurizing device pressurizes low-pressure liquid fuel and outputs it to the vaporization device, which then vaporizes the pressurized liquid fuel and outputs the gas. Figure 2 As shown, the method includes: S201: Obtain ambient temperature, gas temperature, and gas pressure.

[0029] Here, ambient temperature refers to the temperature of the external atmosphere in which the supply system is located. As a specific implementation, ambient temperature can be directly measured by an external temperature sensor installed on the vehicle or equipment using the gas system. For example, the temperature sensor can be positioned away from the engine heat source and in a well-ventilated location to ensure that the measured value accurately reflects the atmospheric temperature. This method provides a direct and reliable way to obtain the thermal state of the external environment. More generally, ambient temperature can be obtained in various ways. For example, it can include, but is not limited to: reading directly from the vehicle's existing ambient temperature sensor, receiving ambient temperature signals from the engine management system or body control module via the vehicle communication bus, or calculating based on indirect parameters such as intake air temperature. All these solutions can achieve the function of obtaining the thermal state of the external environment. In this application, ambient temperature can be understood as a physical quantity that characterizes the degree of hotness or coldness of the external environment in which the supply system is located. Specifically, it can refer to the external atmospheric temperature, or it can encompass indirect parameters that can equivalently reflect the external environmental state, such as the initial temperature of the coolant and the initial temperature of the fuel.

[0030] Gas temperature refers to the temperature of the gaseous fuel supplied to the engine at the outlet of the vaporization unit. One specific implementation method is to obtain this temperature by installing a temperature sensor on the vaporization unit's outlet pipe or common rail. The electronic control unit (ECU) acquires this temperature value in analog or digital signal form. Therefore, at the hardware level, thermocouples or thermistor temperature sensors can be used to acquire the gas temperature; at the software or logic level, analog-to-digital conversion and filtering algorithms can be used to obtain a stable gas temperature value.

[0031] Gas pressure refers to the pressure of the gaseous fuel supplied to the engine within the pipeline. One specific implementation method is to obtain this pressure signal by installing a pressure sensor on the gasification unit outlet line, common rail, or pressure regulating module. The electronic control unit (ECU) collects this pressure signal to determine whether the supply system meets the engine's pressure requirements.

[0032] S202: When the ambient temperature is higher than the preset ambient temperature threshold, the start and stop of the booster device is controlled based on the relationship between the first gas temperature limit threshold and the gas temperature, and the relationship between the first gas pressure threshold and the gas pressure in the first protection parameter set.

[0033] S203: When the ambient temperature is lower than or equal to the preset ambient temperature threshold, the start and stop of the booster device is controlled based on the relationship between the second gas temperature limit threshold and the gas temperature, and the relationship between the second gas pressure threshold and the gas pressure in the second protection parameter set. The second gas temperature limit threshold corresponding to any gas temperature is less than the first gas temperature limit threshold corresponding to that gas temperature.

[0034] Specifically, the first protection parameter set and the second protection parameter set can be two sets stored inside the electronic control unit, including pre-calibrated parameters. The first protection parameter set corresponds to a set of parameters applicable to ambient temperatures higher than a preset ambient temperature threshold (e.g., in conventional low-temperature regions), while the second protection parameter set corresponds to a set of parameters applicable to ambient temperatures lower than or equal to the ambient temperature threshold (e.g., in extremely cold regions). Each protection parameter set includes parameters such as a gas temperature limit threshold and a gas pressure threshold. The values ​​of these parameters can be differentiated based on the vaporization capacity of the vaporization device and the freezing point of the antifreeze used in the engine under corresponding environmental conditions. For example, in regions with lower antifreeze freezing points, the gas temperature limit threshold can be calibrated to be even lower.

[0035] Furthermore, the preset ambient temperature threshold can also be determined based on the low-temperature environmental conditions required for the gas system. For example, if the required low-temperature environmental conditions are between -20℃ and -40℃, the preset ambient temperature threshold can be set to approximately -30℃. The threshold parameters in the two protection parameter sets are also determined based on their applicable environmental conditions, the material tolerance temperature of the gasification device, the low-temperature rating of the seals, and the heat transfer characteristics of the antifreeze. For example, for the second protection parameter set applied to lower environmental conditions, its second gas temperature limit threshold is lower than the first gas temperature limit threshold to ensure the system's environmental adaptability. Simultaneously, this embodiment achieves start-stop control of the booster device by using the relationship between gas temperature and its corresponding threshold, and between gas pressure and its corresponding threshold. This can promptly prevent further temperature drops caused by the continuous supply of cooling energy to the gasification device due to continuous operation of the booster device, preventing leakage of liquid or gas due to low-temperature failure of the seals, or freezing of the gasification device. It can also control the booster device to operate normally when the working conditions are met, thereby improving system reliability.

[0036] Furthermore, by setting different sets of protection parameters for different environmental conditions, the control strategy can be adaptively adjusted according to the different characteristics of the external environment, thereby jointly solving the problem that fixed protection thresholds cannot balance safety and availability due to environmental differences.

[0037] In one embodiment of this application, in step S201 above, when the ambient temperature is higher than a preset ambient temperature threshold, the start-up and shutdown of the booster device are controlled based on the relationship between the first gas temperature limit threshold and the gas temperature, and the relationship between the first gas pressure threshold and the gas pressure in the first protection parameter set. Specifically, this may include: S2021: When the ambient temperature is higher than the preset ambient temperature threshold, obtain the first gas temperature limit threshold and the first gas pressure threshold from the first protection parameter set.

[0038] Specifically, the preset ambient temperature threshold and the first protection parameter set are both pre-stored in the electronic control unit. When the electronic control unit determines that the ambient temperature is higher than the preset ambient temperature threshold, it can directly call the first gas temperature limit threshold and the first gas pressure threshold in the first protection parameter set to compare with the monitored gas temperature and gas pressure.

[0039] S2022: If the gas temperature is lower than the first gas temperature limit threshold, control the booster device to stop working, and after the booster device stops working, determine whether the current gas pressure is lower than the first gas pressure threshold.

[0040] As a specific implementation, the electronic control unit (ECU) monitors the gas temperature in real time and compares it with a first gas temperature limit threshold. Once the gas temperature is detected to drop below this threshold, the ECU generates a pump stop command, cutting off the drive control signal of the booster unit to stop pumping cryogenic liquefied gas fuel to the gasification unit. For example, when the gas temperature is detected to drop from -15°C to -22°C, while the set first gas temperature limit threshold is -20°C, the pump stop condition is determined to be met. This method can promptly prevent further temperature drops caused by the continuous supply of cooling energy to the gasification unit from the booster unit, preventing leaks, gas leaks, or freezing of the gasification unit due to low-temperature seal failure. To control the booster unit to stop working, the power relay of the booster pump motor can be cut off at the hardware level, or a disable signal can be sent to its drive unit; alternatively, the control state machine can be switched to a pump stop protection state at the software or logic level, prohibiting the triggering of the working cycle.

[0041] When the turbocharger stops working, the gas system pressure gradually decreases. When the pressure drops to a certain level, it will affect the normal operation of the gas system; for example, the engine may stall or fail to operate normally due to insufficient gas. Therefore, after the turbocharger stops working, the gas pressure needs to be continuously monitored to determine if it falls below a first gas pressure threshold. This first gas pressure threshold can be considered the minimum permissible gas pressure for the system.

[0042] S2023: If the current gas pressure is lower than the first gas pressure threshold, control the booster device to perform a booster operation.

[0043] Specifically, when the real-time monitored gas pressure is lower than the first gas pressure threshold, the booster device needs to perform a booster operation to increase the pressure and ensure the basic operation of the system. However, due to the low gas temperature, the booster device cannot directly resume normal booster operation. At this time, the electronic control unit can issue a single execution command to the booster device to operate once. The booster device responds to this command by performing a complete booster stroke, for example, a piston pump completing one intake, compression, and discharge cycle, and then resuming the pump stop state. Normally, one booster stroke is enough to raise the gas pressure above the first gas pressure threshold. Therefore, after the booster device performs one booster stroke, it can continuously monitor whether the gas pressure is higher than the first gas pressure threshold. If it is higher, the booster device stops working; if the gas pressure is still lower than the first gas pressure threshold, the booster device can be controlled to perform another booster stroke.

[0044] In one embodiment of this application, the first protection parameter set further includes: a first confirmation time; in the above step S2022, if the gas temperature is lower than the first gas temperature limit threshold, the booster device is controlled to stop working, which may specifically include: if the duration of the gas temperature being lower than the first gas temperature limit threshold reaches the first confirmation time, the booster device is controlled to stop working.

[0045] Specifically, after determining that the gas temperature is below the first gas temperature limit threshold, the booster device is not immediately stopped. Instead, it is stopped only after the duration of the gas temperature being below the first gas temperature limit threshold reaches a first confirmation time. This first confirmation time can be understood as a time reserved for the booster device to complete its current cycle, meaning that subsequent commands are executed only after the booster device completes its current action to prevent mechanical shock.

[0046] In one embodiment of this application, the first set of protection parameters further includes: a first waiting time; In steps S2022 and S2023 above, after the booster device stops working, it is determined whether the current gas pressure is lower than the first gas pressure threshold. If the current gas pressure is lower than the first gas pressure threshold, the booster device is controlled to perform a boosting operation, including: after the booster device stops working, it is determined whether the stop time has reached the first waiting time; if the stop time has reached the first waiting time, it is determined whether the current gas pressure is lower than the first gas pressure threshold; if the current gas pressure is lower than the first gas pressure threshold, the booster device is controlled to perform a boosting operation.

[0047] Specifically, after the booster stops working, not only is the gas pressure monitored in real time, but the cumulative duration of the shutdown is also recorded, and it is determined whether the cumulative duration has reached the first cumulative duration. This ensures that sufficient cooling and recovery time has been achieved after the previous pump stop action, and the output gas temperature has recovered to a certain extent, thus avoiding continuous and frequent restarts.

[0048] In one embodiment of this application, the first protection parameter set further includes: a first gas temperature reset threshold and a first reset confirmation time; after the booster device stops working, the control method of the gas system further includes the following steps: S301: Determine whether the current gas temperature is higher than the first gas temperature reset threshold.

[0049] Specifically, after the booster stops operating, the gas temperature will not decrease due to the booster's operation; that is, the gas temperature begins to recover. Therefore, while recording the cumulative duration of the booster's shutdown, it is possible to continuously determine whether the gas temperature has recovered to above the first gas temperature reset threshold. This first gas temperature reset threshold can be slightly higher than the first gas temperature limit threshold, thus forming hysteresis control and preventing frequent switching of the system's operating mode due to small temperature fluctuations near the threshold.

[0050] S302: If the current gas temperature is higher than the first gas temperature reset threshold and the duration reaches the first reset confirmation time, control the booster device to work normally.

[0051] Specifically, when the gas temperature is determined to be higher than the first gas temperature reset threshold, the duration of this temperature fluctuation is recorded. Once the duration reaches the first reset confirmation time, the normal operation of the booster device is restored. The setting of this first reset confirmation time ensures that the booster device resumes normal operation only after the gas temperature reaches a stable and sustained state, rather than a momentary spike, thus avoiding premature recovery decisions based on a single sample value.

[0052] In one embodiment of this application, in step S203 above, when the ambient temperature is lower than or equal to the preset ambient temperature threshold, the start-up and shutdown of the booster device are controlled based on the relationship between the second gas temperature limit threshold and the gas temperature, and the relationship between the second gas pressure threshold and the gas pressure in the second protection parameter set. Specifically, this may include: S2031: When the ambient temperature is lower than or equal to the preset ambient temperature threshold, obtain the second gas temperature limit threshold and the second gas pressure threshold from the second protection parameter set.

[0053] Specifically, the preset ambient temperature threshold and the second protection parameter set are both pre-stored in the electronic control unit. When the electronic control unit determines that the ambient temperature is lower than or equal to the preset ambient temperature threshold, it can directly call the second gas temperature limit threshold and the second gas pressure threshold in the second protection parameter set to compare with the monitored gas temperature and gas pressure.

[0054] S2032: If the gas temperature is lower than the second gas temperature limit threshold, control the booster device to stop working, and after the booster device stops working, determine whether the current gas pressure is lower than the second gas pressure threshold.

[0055] S2033: If the current gas pressure is lower than the second gas pressure threshold, control the booster device to perform a booster operation.

[0056] As a specific implementation, controlling the booster device to stop working when the gas temperature is lower than the second gas temperature limit threshold, and judging the gas pressure after the booster device stops working, can refer to the specific implementation of steps S2022 and S2023 above, and will not be repeated here. It should be noted that, based on the environmental conditions of the specific application, the second gas temperature limit threshold is lower than the first gas temperature limit threshold, while the second gas pressure threshold can be set to be equal to the first gas pressure threshold, that is, both are the minimum gas pressure allowed by the system. In addition, after the gas temperature is lower than the second gas temperature limit threshold, it can be further determined whether its duration has reached the second confirmation time, that is, the time for the booster device to complete the current cycle operation. When it is completed, the booster device is controlled to stop working.

[0057] In one embodiment of this application, the second protection parameter set further includes: a second waiting time; in steps S2032 and S2033 above, after the booster device stops working, it is determined whether the current gas pressure is lower than the second gas pressure threshold. If the current gas pressure is lower than the second gas pressure threshold, the booster device is controlled to perform a boosting operation, including: after the booster device stops working, it is determined whether the stop working time has reached the second waiting time; if the stop working time has reached the second waiting time, it is determined whether the current gas pressure is lower than the second gas pressure threshold; if the current gas pressure is lower than the second gas pressure threshold, the booster device is controlled to perform a boosting operation.

[0058] Specifically, after the booster stops working, the comparison of the gas pressure and the second gas pressure threshold, as well as the determination of the booster's shutdown time, can refer to the above-described methods for comparing the gas pressure and the first gas pressure threshold and determining the corresponding booster shutdown time, and will not be repeated here. The second waiting time can also be set with reference to the first waiting time, or according to the current environmental conditions.

[0059] In one embodiment of this application, the second protection parameter set further includes: a second gas temperature reset threshold and a second reset confirmation time; after the booster device stops working, the control method further includes: S401: Determine whether the current gas temperature is higher than the second gas temperature reset threshold.

[0060] S402: If the current gas temperature is higher than the second gas temperature reset threshold and the duration reaches the second reset confirmation time, control the booster device to work normally.

[0061] As a specific implementation method, the comparison of the gas temperature and the second gas temperature reset threshold, as well as the determination of the second reset confirmation time, can refer to the specific implementation methods of steps S301 and S302 above, and will not be repeated here. The second gas temperature reset threshold can also be slightly larger than the second gas temperature limit threshold to form a hysteresis condition. Meanwhile, because the system heats up slowly and fluctuates greatly in cold environments, a longer reset confirmation time can be selected to delay the return to normal operation, giving the system sufficient time for thermal recovery and ensuring that it does not easily return to the protection state after recovery. That is, the second reset confirmation time can be set to be slightly larger than the first reset confirmation time.

[0062] Exemplary System Figure 3 A schematic diagram of the gas system provided in the embodiments of this application. Figure 1 .like Figure 3 As shown, the gas system includes a booster device 301, a gasification device 302, and a main control module 303. The booster device 301 is used to boost low-pressure liquid fuel and output it to the gasification device 302. The gasification device 302 is used to gasify the boosted liquid fuel and output gas. The main control module 303 is used to execute the control method of the gas system as described in the above embodiment.

[0063] In one embodiment of this application, such as Figure 4 As shown, taking a high-pressure gas supply system and an LNG booster pump as an example, the control method of the gas system executed by the main control module is explained: The engine electronic control unit identifies the current ambient temperature, as well as the gas temperature and pressure output by the high-pressure gas supply system. If the current ambient temperature exceeds the ambient temperature limit threshold, low-temperature protection is implemented based on the first protection parameter set and using the first protection path. If the current gas temperature is lower than the first gas temperature limit threshold, a pump stop command is executed on the LNG booster pump after the first pump stop confirmation time (i.e., the first confirmation time); otherwise, the current system state is maintained. If the current gas temperature remains lower than the first gas temperature limit threshold, the LNG booster pump will continue to be stopped, which will lead to insufficient gas pressure in the system for an extended period, thus affecting the operation of the dual-fuel engine. Therefore, a judgment condition is added: if the LNG booster pump stop time is longer than the first waiting time and the current gas pressure is lower than the first permissible gas pressure threshold (i.e., the first gas pressure threshold), the LNG booster pump is operated once. If the LNG booster pump stop time is not longer than the first waiting time and the current gas temperature is higher than the first gas temperature reset threshold, a resumption command is executed on the LNG booster pump after the first reset confirmation time; otherwise, the pump stop is maintained, and the above judgment condition is returned.

[0064] If the current ambient temperature is lower than the ambient temperature limit threshold, low temperature protection will be implemented based on the second protection parameter set using the second protection path. The logic principle is similar to that of the first protection path and will not be elaborated further.

[0065] In this application, two protection paths can differentiate between conventional and extremely cold regions based on varying ambient temperatures, differences in vaporization capacity under different ambient temperatures, and the use of antifreeze with different freezing points. This allows for differentiated low-temperature protection of the high-pressure gas supply system, improving system reliability and environmental adaptability. Thus, by implementing two protection paths, problems such as leakage, gas leakage, or vaporizer freezing caused by low-temperature failure of system seals due to excessively low medium temperatures are resolved in low-temperature environments, especially extremely cold environments, thereby improving the system's low-temperature reliability and environmental adaptability.

[0066] Exemplary device Figure 5 This is a schematic diagram of the hardware structure of the electronic device provided in an embodiment of this application. Figure 5 As shown, the electronic device of this embodiment includes a processor 501 and a memory 502.

[0067] The memory 502 stores computer-executed instructions; the processor 501 executes the computer-executed instructions stored in the memory to implement the various steps performed by the electronic device in the above embodiments. For details, please refer to the relevant descriptions in the foregoing method embodiments.

[0068] Alternatively, the memory 502 can be either standalone or integrated with the processor 501.

[0069] When the memory 502 is set up independently, the electronic device also includes a bus 503 for connecting the memory 502 and the processor 501.

[0070] This application also provides a vehicle, which includes the gas system described in the above embodiments.

[0071] Exemplary media and products This application also provides a computer storage medium storing computer execution instructions. When the processor executes the computer execution instructions, the above-described gas system control method is implemented.

[0072] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the above-described gas system control method.

[0073] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative; for instance, the division of modules is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple modules may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interfaces, devices, or modules, and may be electrical, mechanical, or other forms.

[0074] The modules described as separate components may or may not be physically separate. The components shown as modules may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to implement the solution of this embodiment according to actual needs.

[0075] Furthermore, the functional modules in the various embodiments of this application can be integrated into one processing unit, or each module can exist physically separately, or two or more modules can be integrated into one unit. The unit composed of the above modules can be implemented in hardware or in the form of hardware plus software functional units.

[0076] The integrated modules described above, implemented as software functional modules, can be stored in a computer-readable storage medium. These software functional modules, stored in a storage medium, include several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute some steps of the methods of the various embodiments of this application.

[0077] It should be understood that the aforementioned processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), etc. A general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in this invention can be directly manifested as execution by a hardware processor, or execution by a combination of hardware and software modules within the processor.

[0078] The memory may include high-speed RAM, and may also include non-volatile storage (NVM), such as at least one disk storage device, and may also be a USB flash drive, external hard drive, read-only memory, disk or optical disc, etc.

[0079] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of illustration, the buses shown in the accompanying drawings are not limited to a single bus or a single type of bus.

[0080] The aforementioned storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. The storage medium can be any available medium that can be accessed by a general-purpose or special-purpose computer.

[0081] An exemplary storage medium is coupled to a processor, enabling the processor to read information from and write information to the storage medium. Alternatively, the storage medium can be an integral part of the processor. Both the processor and the storage medium can reside in an Application Specific Integrated Circuit (ASIC). Alternatively, the processor and storage medium can exist as discrete components in an electronic device or host device.

[0082] Those skilled in the art will understand that all or part of the steps of the above-described method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments; and the aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A control method for a gas system, characterized in that, The gas system includes a pressurizing device and a gasification device. The pressurizing device pressurizes low-pressure liquid fuel and outputs it to the gasification device. The gasification device gasifies the pressurized liquid fuel and outputs gas. The control method includes: Obtain ambient temperature, gas temperature, and gas pressure; When the ambient temperature is higher than the preset ambient temperature threshold, the start and stop of the booster device are controlled based on the relationship between the first gas temperature limit threshold and the gas temperature, and the relationship between the first gas pressure threshold and the gas pressure in the first protection parameter set. When the ambient temperature is lower than or equal to the preset ambient temperature threshold, the start and stop of the booster device are controlled based on the relationship between the second gas temperature limit threshold and the gas temperature, and the relationship between the second gas pressure threshold and the gas pressure in the second protection parameter set. The second gas temperature limit threshold corresponding to any gas temperature is less than the first gas temperature limit threshold corresponding to that gas temperature.

2. The control method for a gas system according to claim 1, characterized in that, When the ambient temperature is higher than a preset ambient temperature threshold, the start-up and shutdown of the booster device are controlled based on the relationship between the first gas temperature limit threshold and the gas temperature, and the relationship between the first gas pressure threshold and the gas pressure, as set in the first protection parameter set. This includes: When the ambient temperature is higher than the preset ambient temperature threshold, the first gas temperature limit threshold and the first gas pressure threshold in the first protection parameter set are obtained. If the gas temperature is lower than the first gas temperature limit threshold, the booster device is controlled to stop working, and after the booster device stops working, it is determined whether the current gas pressure is lower than the first gas pressure threshold. If the current gas pressure is lower than the first gas pressure threshold, the booster device is controlled to perform a booster operation.

3. The control method for a gas system according to claim 2, characterized in that, The first set of protection parameters also includes: a first confirmation time; If the gas temperature is lower than the first gas temperature limit threshold, controlling the booster device to stop working includes: If the duration of the gas temperature being lower than the first gas temperature limit threshold reaches the first confirmation time, the booster device is controlled to stop working.

4. The control method for a gas system according to claim 2, characterized in that, The first set of protection parameters also includes: a first waiting time; After the booster device stops working, it is determined whether the current gas pressure is lower than the first gas pressure threshold. If the current gas pressure is lower than the first gas pressure threshold, the booster device is controlled to perform a boosting operation, including: After the booster device stops working, it is determined whether the stop time has reached the first waiting time; If the stop working time reaches the first waiting time, determine whether the current gas pressure is lower than the first gas pressure threshold. If the current gas pressure is lower than the first gas pressure threshold, the booster device is controlled to perform a booster operation.

5. The control method for a gas system according to claim 1, characterized in that, The first set of protection parameters further includes: a first gas temperature reset threshold and a first reset confirmation time; after the booster device stops working, the control method further includes: Determine whether the current gas temperature is higher than the first gas temperature reset threshold; If the current gas temperature is higher than the first gas temperature reset threshold and the duration reaches the first reset confirmation time, the booster device is controlled to operate normally.

6. The control method for a gas system according to claim 1, characterized in that, When the ambient temperature is lower than or equal to the preset ambient temperature threshold, the start-up and shutdown of the booster device are controlled based on the relationship between the second gas temperature limit threshold and the gas temperature, and the relationship between the second gas pressure threshold and the gas pressure, as set in the second protection parameter set. This includes: When the ambient temperature is lower than or equal to the preset ambient temperature threshold, the second gas temperature limit threshold and the second gas pressure threshold in the second protection parameter set are obtained. If the gas temperature is lower than the second gas temperature limit threshold, the booster device is controlled to stop working, and after the booster device stops working, it is determined whether the current gas pressure is lower than the second gas pressure threshold. If the current gas pressure is lower than the second gas pressure threshold, the booster device is controlled to perform a booster operation.

7. The control method for a gas system according to claim 6, characterized in that, The second set of protection parameters further includes: a second waiting time; after the booster device stops working, determining whether the current gas pressure is lower than a second gas pressure threshold; if the current gas pressure is lower than the second gas pressure threshold, controlling the booster device to perform a booster operation, including: After the booster device stops working, it is determined whether the stop time has reached the second waiting time; If the stop working time reaches the second waiting time, determine whether the current gas pressure is lower than the second gas pressure threshold. If the current gas pressure is lower than the second gas pressure threshold, the booster device is controlled to perform a booster operation.

8. The control method for a gas system according to claim 1, characterized in that, The second set of protection parameters further includes: a second gas temperature reset threshold and a second reset confirmation time; the control method further includes: Determine whether the current gas temperature is higher than the second gas temperature reset threshold; If the current gas temperature is higher than the second gas temperature reset threshold and the duration reaches the second reset confirmation time, the booster device is controlled to operate normally.

9. A gas system, characterized in that, The gas system includes a pressurizing device, a gasification device, and a main control module. The pressurizing device is used to pressurize low-pressure liquid fuel and output it to the gasification device. The gasification device is used to gasify the pressurized liquid fuel and output gas. The main control module is used to execute the control method of the gas system as described in any one of claims 1-8.

10. A vehicle, characterized in that, Includes the gas system as described in claim 9.

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