A gas leak detection method, device, vehicle and storage medium

Abstract

The present invention discloses a gas leakage detection method, device, vehicle and storage medium. The gas leakage detection method comprises: after the engine ECU is powered on, judging whether a gas leakage fault is detected when the engine is not started, and after the gas leakage fault is detected, controlling the engine to start; after the engine is in a running state, if the engine is in a fuel cut-off state, and the duration of the engine in the fuel cut-off state exceeds the state duration threshold, reading the current oxygen concentration value of the engine front oxygen sensor; determining whether the gas has a nozzle internal leakage fault or a gas external leakage fault according to the current oxygen concentration value. The present invention realizes accurate judgment of the gas leakage direction, so as to perform different fault actions according to different leakage faults, and reasonably implement the maintenance and protection of the gas system.

Description

Technical Field

[0001] The present invention relates to the technical field of gas leakage diagnosis, and in particular to a gas leakage detection method, device, vehicle and storage medium. Background Art

[0002] Since the advent of natural gas engines in the early 20th century, after 80 years of development, natural gas engine technology has become increasingly mature. At present, most natural gas engines are modified based on existing diesel or gasoline engines. In addition, due to the wide range of applications of natural gas engines, there is a large gap in technical levels.

[0003] Natural gas engines use universal gas nozzles. When a gas nozzle leaks, it will disrupt the engine's air-fuel ratio control, causing abnormal combustion in the cylinder, leading to worsening emissions, engine damage, and even fires that endanger personal safety. At the same time, existing technology cannot distinguish whether the gas is leaking from the nozzle or leaking from the gas pipeline to the atmosphere. Summary of the invention

[0004] The present invention provides a gas leakage detection method, device, vehicle and storage medium to solve the problem that the prior art cannot distinguish whether the gas is leaking from the nozzle or leaking from the gas pipeline to the atmosphere.

[0005] According to one aspect of the present invention, a gas leak detection method is provided, the gas leak detection method comprising:

[0006] After the engine ECU is powered on, determining whether a gas leakage fault is detected when the engine is not started, and controlling the engine to start after the gas leakage fault is detected;

[0007] After the engine is in the running state, if the engine is in the fuel cut-off state, and the duration of the engine in the fuel cut-off state exceeds a state duration threshold, reading a current oxygen concentration value of the engine front oxygen sensor;

[0008] It is determined according to the current oxygen concentration value whether there is a fuel gas nozzle internal leakage fault or a fuel gas external leakage fault.

[0009] Optionally, after determining whether a gas leakage fault is detected when the engine is not started, the method further includes:

[0010] If it is detected that there is no gas leakage fault, a gas leakage fault judgment is performed after the engine ECU is powered on.

[0011] Optionally, the gas leak detection method further includes:

[0012] If there is a gas leakage fault after the engine ECU is powered on, the engine is controlled to start, and it is determined whether the engine is in a fuel cut-off state, and whether the duration of the engine in the fuel cut-off state exceeds a state duration threshold;

[0013] If there is no gas leakage fault after the engine ECU is powered on, the engine is controlled to start, and when the engine speed is less than the set speed threshold, or after receiving a power-off command, the gas leakage power-off detection function is activated to control the engine ECU to power off.

[0014] Optionally, after the engine ECU is powered on, a gas leakage fault diagnosis is performed, including:

[0015] After the engine ECU is powered on, the gas pressure drop value of the pipeline between the gas cut-off valve and the gas injection valve is detected, and it is determined whether the gas nozzle has a gas leakage fault according to the gas pressure drop value.

[0016] Optionally, determining whether the fuel gas has a nozzle internal leakage fault or a fuel gas external leakage fault according to the current oxygen concentration value includes:

[0017] If the current oxygen concentration value is greater than the set oxygen concentration threshold, it is determined that there is a nozzle internal leakage fault in the fuel gas;

[0018] If the current oxygen concentration value is less than or equal to the set oxygen concentration threshold, it is determined that there is a gas leakage fault.

[0019] Optionally, the gas leak detection method further includes:

[0020] When there is a nozzle internal leakage fault in the gas, a catalyst protection strategy is executed;

[0021] When there is a gas leakage fault, the vehicle safety protection strategy is executed.

[0022] Optionally, after the engine is in a running state, the method further comprises:

[0023] If the engine is not in the fuel cut-off state, or the duration of the engine being in the fuel cut-off state does not exceed the state duration threshold, the engine operating state continues to be monitored.

[0024] According to another aspect of the present invention, a gas leakage detection device is provided, the gas leakage detection device comprising:

[0025] The engine start-up detection module is used to determine whether a gas leakage fault is detected when the engine is not started after the engine ECU is powered on, and control the engine to start after the gas leakage fault is detected;

[0026] an oxygen concentration value acquisition module, configured to read the current oxygen concentration value of the engine front oxygen sensor after the engine is in the running state if the engine is in the fuel cut-off state and the duration of the engine in the fuel cut-off state exceeds a state duration threshold;

[0027] The leakage direction determination module is used to determine whether the fuel gas has a nozzle internal leakage fault or a fuel gas external leakage fault according to the current oxygen concentration value.

[0028] According to another aspect of the present invention, there is provided a vehicle, the vehicle comprising:

[0029] at least one processor; and

[0030] a memory communicatively connected to the at least one processor; wherein,

[0031] The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the gas leak detection method described in any embodiment of the present invention.

[0032] According to another aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the gas leak detection method described in any embodiment of the present invention when executed.

[0033] The technical solution of the embodiment of the present invention is to determine whether a gas leakage fault is detected when the engine is not started after the engine ECU is powered on, and control the engine to start after the gas leakage fault is detected; after the engine is in the running state, if the engine is in the fuel cut-off state, and the duration of the engine in the fuel cut-off state exceeds the state duration threshold, read the current oxygen concentration value of the engine front oxygen sensor; determine whether the gas has a nozzle internal leakage fault or a gas external leakage fault according to the current oxygen concentration value. The present invention solves the problem that the prior art cannot distinguish whether the gas leakage is a nozzle internal leakage or a gas pipeline leakage to the atmosphere, and realizes accurate judgment of the gas leakage direction, so as to perform different fault actions according to different leakage faults, and reasonably implement the maintenance and protection of the gas system.

[0034] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 is a flow chart of a gas leak detection method provided according to Embodiment 1 of the present invention;

[0037] Figure 2 It is a principle structure diagram of a method for realizing gas leakage detection applicable to an embodiment of the present invention;

[0038] Figure 3 is a flow chart of a gas leak detection method provided according to Embodiment 2 of the present invention;

[0039] Figure 4 is a structural schematic diagram of a gas leak detection device provided according to Embodiment 3 of the present invention;

[0040] Figure 5 It is a structural schematic diagram of a vehicle for implementing the gas leak detection method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0042] It should be noted that the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatus.

[0043] Embodiment 1

[0044] Figure 1A flow chart of a gas leakage detection method is provided for the first embodiment of the present invention. This embodiment is applicable to the case of diagnosing leakage faults of gas nozzles of natural gas engines. The gas leakage detection method can be performed by a gas leakage detection device. The gas leakage detection device can be implemented in the form of hardware and / or software. The gas leakage detection device can be configured in a vehicle with a natural gas engine. Figure 1 As shown, the gas leak detection method includes:

[0045] S110: After the engine ECU is powered on, it is determined whether a gas leakage fault is detected when the engine is not started, and after the gas leakage fault is detected, the engine is controlled to start.

[0046] Among them, ECU (Electronic Control Unit), also known as "driving computer" or "on-board computer", is the abbreviation of automobile engine electronic control unit, commonly known as engine computer. The function of ECU is to control the engine's ignition, fuel injection, air-fuel ratio, idle speed, exhaust gas recirculation, etc. by continuously collecting signals from various sensors of the car when the engine is working, so that the engine can operate normally. In addition, ECU also has the function of engine fault self-diagnosis.

[0047] The engine ECU is powered on when the vehicle key presses the unlock button or opens the door or presses the start button, and the wake-up signal wakes it up and controls the engine ECU to power on. In this embodiment, the engine is not started when the engine ECU is powered on.

[0048] Specifically, after the engine ECU is powered on and the engine is not started, whether a gas leakage fault has been detected. Whether the gas has a gas leakage fault can be determined by an existing gas leakage diagnosis method, that is, judging whether the gas has a gas leakage fault by the gas pressure drop value.

[0049] See also Figure 2 After the engine is powered on, open the gas shut-off valve to inflate and then close the gas shut-off valve. At this time, the pipeline between the gas shut-off valve and the injection valve is equivalent to a closed container. The gas pressure drop value of the pipeline between the gas shut-off valve and the gas injection valve is detected. If the gas pressure drop value is lower than the set limit, it is considered that there is a leakage fault in the gas nozzle. If the gas pressure drop value is not lower than the set limit, it is considered that there is no leakage fault in the gas nozzle.

[0050] The set limit value may be selected and set by those skilled in the art according to actual conditions, and this embodiment does not impose any limitation on this.

[0051] The gas pressure of the pipeline between the gas shut-off valve and the gas injection valve may be detected by a pressure sensor, or may be detected by other existing technologies, and this embodiment does not impose any limitation on this.

[0052] On the basis of the above, after the engine ECU is powered on, if it is detected that there is no gas leakage fault, then the gas leakage fault judgment is performed after the engine ECU is powered on. At this time, the method for judging whether there is a gas leakage fault can be the above method. Figure 2 The method of judging by the gas pressure drop value is used.

[0053] Furthermore, if after the engine ECU is powered on, it is detected that a gas leakage fault exists when the engine is powered off, the engine is controlled to start, and it is further determined whether the engine is in a fuel-off state, and whether the duration of the engine in the fuel-off state exceeds a state duration threshold, that is, step S120 is continued to be executed; if after the engine ECU is powered on, it is detected that there is no gas leakage fault when the engine is powered off, a gas leakage fault judgment is first performed, and if a gas leakage is detected, the action is executed according to the further measures, and if no gas leakage is detected, the engine is controlled to start, and when the engine speed is less than the set speed threshold, or after receiving a power-off command, the gas leakage power-off detection function is activated to detect the gas leakage fault, and the engine ECU is controlled to power off.

[0054] S120: After the engine is in the running state, if the engine is in the fuel cut-off state and the duration of the engine in the fuel cut-off state exceeds a state duration threshold, read the current oxygen concentration value of the engine front oxygen sensor.

[0055] The engine being in a running state refers to a state in which the engine is running under various loads. The specific running state of the engine is not limited in this embodiment.

[0056] The state duration threshold may be selected and set by those skilled in the art according to actual conditions, and this embodiment does not impose any limitation on this.

[0057] On the basis of the above, if the engine is not in the fuel cut-off state, or the duration of the engine being in the fuel cut-off state does not exceed the state duration threshold, the engine operating state continues to be monitored.

[0058] The vehicle oxygen sensor is actually an important feedback sensor in the electronic fuel injection engine automatic control system. It is mainly divided into two types: zirconium dioxide and titanium dioxide. Both are assembled on the engine exhaust pipe. The vehicle oxygen sensor is divided into front oxygen sensor and rear oxygen sensor. The front oxygen sensor is in front of the three-way catalytic converter, and the rear oxygen sensor is behind the three-way catalytic converter.

[0059] The front oxygen sensor is designed to detect the oxygen concentration in the vehicle's engine exhaust, and then transmit the information obtained in the form of a signal to the engine ECU. The engine ECU will perform feedback adjustment on the air-fuel ratio based on the oxygen concentration information obtained.

[0060] In this embodiment, when the engine is in a fuel-cut state and the duration of the engine in the fuel-cut state exceeds a state duration threshold, the current oxygen concentration value of the engine front oxygen sensor is read, and the current oxygen concentration value is the current oxygen concentration in the vehicle engine exhaust gas detected in real time.

[0061] S130. Determine, based on the current oxygen concentration value, whether there is a fuel gas nozzle internal leakage fault or a fuel gas external leakage fault.

[0062] On the basis of the above, the direction of gas leakage is determined according to the current oxygen concentration value. Specifically, if the current oxygen concentration value is greater than the set oxygen concentration threshold, it is determined that there is an internal leakage fault in the nozzle of the gas; if the current oxygen concentration value is less than or equal to the set oxygen concentration threshold, it is determined that there is an external leakage fault of the gas.

[0063] Further, on the basis of the above, after determining that there is a nozzle internal leakage fault or a gas external leakage fault in the gas, the technicians in the field can be reminded to implement targeted gas leakage fault troubleshooting according to the nozzle internal leakage fault or the gas external leakage fault. Specifically, when the gas has a nozzle internal leakage fault, the catalyst protection strategy is executed, that is, it is considered that there is a certain cracking risk of the three-way catalytic converter, so the three-way catalytic converter protection related actions are executed; when there is a gas external leakage fault, the vehicle safety protection strategy is executed, that is, it is considered that there is a certain impact on the vehicle driving safety, and the vehicle safety related protection measures are executed.

[0064] It should be noted that both the catalyst protection strategy and the vehicle safety protection strategy can be implemented using existing technologies, and this embodiment will not be repeated here. The advantage of setting up this embodiment is that it illustrates that the present application can perform different fault actions according to different gas leakage faults, thereby reasonably protecting the engine and after-treatment system.

[0065] The technical solution of the embodiment of the present invention is to determine whether a gas leakage fault is detected when the engine is not started after the engine ECU is powered on, and control the engine to start after the gas leakage fault is detected; after the engine is in the running state, if the engine is in the fuel cut-off state, and the duration of the engine in the fuel cut-off state exceeds the state duration threshold, read the current oxygen concentration value of the engine front oxygen sensor; determine whether the gas has a nozzle internal leakage fault or a gas external leakage fault according to the current oxygen concentration value. The present invention solves the problem that the prior art cannot distinguish whether the gas leakage is a nozzle internal leakage or a gas pipeline leakage to the atmosphere, and realizes accurate judgment of the gas leakage direction, so as to perform different fault actions according to different leakage faults, and reasonably implement the maintenance and protection of the gas system.

[0066] Embodiment 2

[0067] Figure 3 This is a flow chart of a gas leak detection method provided in Embodiment 2 of the present invention. This embodiment provides an optional implementation method based on the above embodiment. Figure 3 As shown, the gas leak detection method includes:

[0068] S310, the engine ECU is powered on.

[0069] S320, determining whether a gas leakage fault is detected when the engine is not started, if so, executing step S330, if not, executing step S340.

[0070] S330, control the engine to start, and execute step S350.

[0071] S340, determine whether there is a gas leakage fault in the engine, if so, execute step S330, if not, execute step S341.

[0072] S341, control the engine to start, and execute step S342.

[0073] S342: Determine whether the engine speed is less than a set speed threshold, or whether a power-off command is received. If so, execute step S343; if not, execute step S342.

[0074] The rotation speed threshold may be set by those skilled in the art according to actual conditions, and this embodiment does not impose any limitation on this.

[0075] The power-off command can be sent by the vehicle controller or other vehicle controllers to the engine ECU, and the power-off command is used to control the engine ECU to power off.

[0076] S343, activating the gas leakage power-off detection function, controlling the engine ECU to power off, and executing step S310.

[0077] It can be understood that the gas leakage power-off detection function is a gas leakage fault detection performed on gas leakage when the engine ECU is powered off. The result of detecting whether there is a gas leakage fault can be used in the execution of step S320, that is, the gas leakage fault detection result here is obtained after the engine ECU is powered on next time.

[0078] Specifically, after the engine ECU is powered on at step S310, step S320 is executed to determine whether a gas leakage fault is detected when the engine is not started. If the gas is detected to have a gas leakage fault at step S343, step S320 can determine that a gas leakage fault is detected. Similarly, if the gas is detected to have no gas leakage fault at step S343, step S320 determines that no gas leakage fault is detected.

[0079] S350, determining whether the engine is in a fuel-off state, and whether the duration of the engine in the fuel-off state exceeds a state duration threshold, if so, executing step S360, if not, executing step S370.

[0080] S360, read the current oxygen concentration value of the engine front oxygen sensor, and execute step S380.

[0081] S370. Continue to monitor the engine operating status.

[0082] S380, determine whether the current oxygen concentration value is greater than the set oxygen concentration threshold, if so, execute step S381, if not, execute step S382.

[0083] S381. Determine that there is a fuel gas nozzle internal leakage fault and execute the catalyst protection strategy.

[0084] S382: Determine that there is a gas leakage fault and execute a vehicle safety protection strategy.

[0085] Embodiment 3

[0086] Figure 4 This is a structural schematic diagram of a gas leak detection device provided in Embodiment 3 of the present invention.

[0087] like Figure 4 As shown, the gas leakage detection device comprises:

[0088] The engine start-up detection module 410 is used to determine whether a gas leakage fault is detected when the engine is not started after the engine ECU is powered on, and control the engine to start after the gas leakage fault is detected;

[0089] an oxygen concentration value acquisition module 420, configured to read a current oxygen concentration value of the engine front oxygen sensor if the engine is in a fuel cut-off state and the duration of the engine in the fuel cut-off state exceeds a state duration threshold after the engine is in a running state;

[0090] The leakage direction determination module 430 is used to determine whether the fuel gas has a nozzle internal leakage fault or a fuel gas external leakage fault according to the current oxygen concentration value.

[0091] Optionally, the gas leak detection device further includes:

[0092] If it is detected that there is no gas leakage fault, a gas leakage fault judgment is performed after the engine ECU is powered on.

[0093] Optionally, the gas leak detection device further includes:

[0094] A gas leakage fault control module is used to control the engine to start if a gas leakage fault exists after the engine ECU is powered on, and to determine whether the engine is in a fuel cut-off state, and whether the duration of the engine being in the fuel cut-off state exceeds a state duration threshold;

[0095] There is no gas leakage fault control module, which is used to execute if there is no gas leakage fault after the engine ECU is powered on, then first perform a gas leakage fault judgment, if a gas leakage is detected, then execute the action according to the gas leakage fault control module, if no gas leakage is detected, then control the engine to start, and when the engine speed is less than the set speed threshold, or after receiving the power-off command, activate the gas leakage power-off detection function to control the engine ECU to power off.

[0096] Optionally, after the engine ECU is powered on, a gas leakage fault diagnosis is performed, including:

[0097] After the engine ECU is powered on, the gas pressure drop value of the pipeline between the gas cut-off valve and the gas injection valve is detected, and it is determined whether the gas nozzle has a gas leakage fault according to the gas pressure drop value.

[0098] Optionally, the leakage direction determination module 430 includes:

[0099] A nozzle internal leakage fault determination unit, used to determine that the fuel gas has a nozzle internal leakage fault if the current oxygen concentration value is greater than a set oxygen concentration threshold value;

[0100] The gas leakage fault determining unit is used to determine that a gas leakage fault exists if the current oxygen concentration value is less than or equal to a set oxygen concentration threshold.

[0101] Optionally, the gas leak detection device further includes:

[0102] A nozzle internal leakage fault processing module, used for executing a catalyst protection strategy when the fuel gas has a nozzle internal leakage fault;

[0103] The gas leakage fault processing module is used to execute the vehicle safety protection strategy when there is a gas leakage fault.

[0104] Optionally, after the engine is in a running state, the method further comprises:

[0105] If the engine is not in the fuel cut-off state, or the duration of the engine being in the fuel cut-off state does not exceed the state duration threshold, the engine operating state continues to be monitored.

[0106] The gas leakage detection device provided in the embodiment of the present invention can execute the gas leakage detection method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects for executing the gas leakage detection method.

[0107] Embodiment 4

[0108] Figure 5 A schematic diagram of a vehicle 510 that can be used to implement an embodiment of the present invention is shown. The vehicle includes a digital computer intended to represent various forms, such as a laptop computer, desktop computer, workstation, personal digital assistant, server, blade server, mainframe computer, and other suitable computers. Figure 5 As shown, the vehicle 510 includes at least one processor 511, and a memory connected to the at least one processor 511 in communication, such as a read-only memory (ROM) 512, a random access memory (RAM) 513, etc., wherein the memory stores a computer program that can be executed by at least one processor, and the processor 511 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 512 or the computer program loaded from the storage unit 518 to the random access memory (RAM) 513. In the RAM 513, various programs and data required for the operation of the vehicle 510 can also be stored. The processor 511, the ROM 512, and the RAM 513 are connected to each other via a bus 514. An input / output (I / O) interface 515 is also connected to the bus 514.

[0109] A number of components in the vehicle 510 are connected to the I / O interface 515, including: an input unit 516, such as a keyboard, a mouse, etc.; an output unit 517, such as various types of displays, speakers, etc.; a storage unit 518, such as a disk, an optical disk, etc.; and a communication unit 519, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 519 allows the vehicle 510 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0110] The processor 511 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the processor 511 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 511 executes the various methods and processes described above, such as a gas leak detection method.

[0111] In some embodiments, the gas leak detection method may be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 518. In some embodiments, part or all of the computer program may be loaded and / or installed on the vehicle 510 via the ROM 512 and / or the communication unit 519. When the computer program is loaded into the RAM 513 and executed by the processor 511, one or more steps of the gas leak detection method described above may be performed. Alternatively, in other embodiments, the processor 511 may be configured to perform the gas leak detection method in any other suitable manner (e.g., by means of firmware).

[0112] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0113] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer program is executed by the processor, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0114] In the context of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in combination with an instruction execution system, device or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0115] To provide interaction with a user, the systems and techniques described herein can be implemented on a vehicle having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user can provide input to the vehicle. Other types of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0116] The systems and techniques described herein may be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0117] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.

[0118] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0119] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A gas leak detection method, characterized in that: include: After the engine ECU is powered on, determining whether a gas leakage fault is detected when the engine is not started, and after detecting that a gas leakage fault exists when the engine is not started, controlling the engine to start; After the engine is in the running state, if the engine is in the fuel cut-off state, and the duration of the engine in the fuel cut-off state exceeds a state duration threshold, reading a current oxygen concentration value of the engine front oxygen sensor; Determining whether there is a nozzle internal leakage fault or a gas external leakage fault according to the current oxygen concentration value; Among them, determining whether there is a gas nozzle internal leakage fault or a gas external leakage fault according to the current oxygen concentration value includes: if the current oxygen concentration value is greater than the set oxygen concentration threshold, it is determined that there is a gas nozzle internal leakage fault; if the current oxygen concentration value is less than or equal to the set oxygen concentration threshold, it is determined that there is a gas external leakage fault.

2. The gas leak detection method according to claim 1, characterized in that: After determining whether a gas leakage fault is detected when the engine is not started, the method further includes: If it is detected that there is no gas leakage fault, a gas leakage fault judgment is performed after the engine ECU is powered on.

3. The gas leak detection method according to claim 2, characterized in that: The gas leak detection method further comprises: If there is a gas leakage fault after the engine ECU is powered on, the engine is controlled to start, and it is determined whether the engine is in a fuel cut-off state, and whether the duration of the engine in the fuel cut-off state exceeds a state duration threshold; If there is no gas leakage fault after the engine ECU is powered on, the engine is controlled to start, and when the engine speed is less than the set speed threshold, or after receiving a power-off command, the gas leakage power-off detection function is activated to control the engine ECU to power off.

4. The gas leak detection method according to claim 2, characterized in that: After the engine ECU is powered on, the fuel gas leakage fault is judged, including: After the engine ECU is powered on, the gas pressure drop value of the pipeline between the gas cut-off valve and the gas injection valve is detected, and whether there is a gas leakage fault is determined according to the gas pressure drop value.

5. The gas leak detection method according to claim 1, characterized in that: The gas leak detection method further comprises: When there is a nozzle internal leakage fault in the gas, a catalyst protection strategy is executed; When there is a gas leakage fault, the vehicle safety protection strategy is executed.

6. The gas leak detection method according to claim 1, characterized in that: After the engine is in the running state, the method further comprises: If the engine is not in the fuel cut-off state, or the duration of the engine being in the fuel cut-off state does not exceed the state duration threshold, the engine operating state continues to be monitored.

7. A gas leak detection device, characterized in that: include: The engine start-up detection module is used to determine whether a gas leakage fault is detected when the engine is not started after the engine ECU is powered on, and control the engine to start after the gas leakage fault is detected when the engine is not started; an oxygen concentration value acquisition module, configured to read the current oxygen concentration value of the engine front oxygen sensor after the engine is in the running state if the engine is in the fuel cut-off state and the duration of the engine in the fuel cut-off state exceeds a state duration threshold; A leakage direction determination module is used to determine whether the gas has a nozzle internal leakage fault or a gas external leakage fault according to the current oxygen concentration value; wherein, determining whether the gas has a nozzle internal leakage fault or a gas external leakage fault according to the current oxygen concentration value includes: if the current oxygen concentration value is greater than a set oxygen concentration threshold, determining that the gas has a nozzle internal leakage fault; if the current oxygen concentration value is less than or equal to the set oxygen concentration threshold, determining that there is a gas external leakage fault.

8. A vehicle, characterized in that: The vehicle comprises: 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, and the computer program is executed by the at least one processor so that the at least one processor can execute the gas leak detection method according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the gas leak detection method according to any one of claims 1 to 6 when executed.

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