Three-way catalyst ammonia leakage detection method, related device and electronic equipment

Abstract

The invention provides a three-way catalyst ammonia leakage detection method, related device and electronic equipment, and the method comprises the following steps: an obtaining step: when a vehicle is in a steady-state working condition and oxygen concentration data detected by a nitrogen oxide sensor is greater than a preset value, obtaining an ammonia leakage detection step; acquiring a time proportion and oxygen concentration distribution when the oxygen concentration data in one window is smaller than a first threshold value; a first determination step of determining whether the time ratio is greater than a second threshold value and whether the oxygen concentration distribution is less than a third threshold value; a second determination step: determining ammonia leakage of the three-way catalyst under the condition that the time ratio is greater than a second threshold value and the oxygen concentration distribution is smaller than a third threshold value; and a third determination step: determining that the three-way catalyst does not generate ammonia leakage under the condition that the time ratio is smaller than or equal to a second threshold value or the oxygen concentration distribution is greater than or equal to a third threshold value. The problem that ammonia gas leakage in the three-way catalyst cannot be accurately recognized in the prior art is solved.

Description

Technical Field

[0001] The present application relates to the technical field of ammonia leakage monitoring, and in particular to a method, a detection device, a computer-readable storage medium, a computer program product and an electronic device for detecting ammonia leakage of a three-way catalytic converter. Background Art

[0002] In the current vehicle exhaust treatment system, the detection of ammonia leakage in the three-way catalytic converter mainly relies on some traditional sensors, but the accuracy of traditional sensors is limited and it is difficult to accurately identify ammonia leakage in the three-way catalytic converter. Summary of the invention

[0003] The main purpose of the present application is to provide a method, a detection device, a computer-readable storage medium, a computer program product and an electronic device for detecting ammonia leakage in a three-way catalytic converter, so as to at least solve the problem in the prior art that it is difficult to accurately identify ammonia leakage in a three-way catalytic converter.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a method for detecting ammonia leakage of a three-way catalytic converter is provided, wherein the three-way catalytic converter is located in a vehicle, and the method comprises: an acquisition step, when the vehicle is in a steady-state condition and the oxygen concentration data detected by the nitrogen oxide sensor is greater than a preset value, acquiring the time proportion of the oxygen concentration data within a window that is less than a first threshold value and the oxygen concentration distribution, wherein the window is a preset time period or a time period required for the engine to complete a preset work, the nitrogen oxide sensor is installed in the exhaust pipe of the three-way catalytic converter, the oxygen concentration data is the oxygen concentration of the exhaust gas in the exhaust pipe of the three-way catalytic converter, and the oxygen concentration distribution is the distribution of the oxygen concentration data within the window; a first determination step, determining whether the time proportion is greater than a second threshold value and whether the oxygen concentration distribution is less than a third threshold value; a second determination step, determining that ammonia leakage occurs in the three-way catalytic converter when the time proportion is greater than the second threshold value and the oxygen concentration distribution is less than the third threshold value; and determining that ammonia leakage does not occur in the three-way catalytic converter when the time proportion is less than or equal to the second threshold value or the oxygen concentration distribution is greater than or equal to the third threshold value.

[0005] Optionally, the method also includes: when it is determined that no ammonia leakage occurs in the three-way catalytic converter, obtaining the number of windows where no ammonia leakage occurs, and different windows correspond to the same operating conditions of the vehicle; when the number of windows where no ammonia leakage occurs is greater than or equal to a fourth threshold, adjusting the air-fuel ratio setting value of the engine in the vehicle so that the adjusted air-fuel ratio setting value is greater than the air-fuel ratio setting value before adjustment, and obtaining the oxygen concentration data after adjusting the air-fuel ratio setting value; based on the relationship between the oxygen concentration data after adjusting the air-fuel ratio setting value and the oxygen concentration data before adjusting the air-fuel ratio setting value, at least determining whether ammonia leakage occurs in the three-way catalytic converter.

[0006] Optionally, based on the relationship between the oxygen concentration data after adjusting the air-fuel ratio setting value and the oxygen concentration data before adjusting the air-fuel ratio setting value, at least whether the three-way catalytic converter has ammonia leakage is determined, including: a third determination step, when the oxygen concentration data after adjusting the air-fuel ratio setting value is less than the oxygen concentration data before adjusting the air-fuel ratio setting value, determining that the three-way catalytic converter has ammonia leakage, when the oxygen concentration data after adjusting the air-fuel ratio setting value is greater than or equal to the oxygen concentration data before adjusting the air-fuel ratio setting value, determining that the three-way catalytic converter has not ammonia leakage; an adjustment step, continuing to adjust the air-fuel ratio setting value, so that when it is determined that the three-way catalytic converter has ammonia leakage, the current adjustment direction of the air-fuel ratio setting value is the same as the previous adjustment direction, and when it is determined that the three-way catalytic converter has not ammonia leakage, the current adjustment direction is opposite to the previous adjustment direction; a first loop step, cyclically executing the third determination step and the adjustment step a predetermined number of times.

[0007] Optionally, when it is determined that no ammonia leakage occurs in the three-way catalytic converter, the number of the windows where no ammonia leakage occurs is obtained, including: a counting step, when it is determined that no ammonia leakage occurs in the three-way catalytic converter, controlling the count value to increase by 1; and a second loop step, cyclically executing the obtaining step, the first determining step, the second determining step and the counting step to obtain the number of the windows where no ammonia leakage occurs.

[0008] Optionally, adjusting the air-fuel ratio setting value of the engine in the vehicle includes: adjusting the injection time of the fuel injector of the vehicle or adjusting the throttle opening of the vehicle, thereby adjusting the air-fuel ratio setting value of the engine in the vehicle.

[0009] Optionally, before the acquisition step, the method further includes: acquiring steady-state judgment parameters, the steady-state judgment parameters including at least part of the following: the engine speed, the speed change rate, the intake air charge of the engine, the intake air charge change rate, the engine water temperature, the temperature of the three-way catalytic converter, the mass flow rate of exhaust gas in the exhaust pipe, the working state of the nitrogen oxide sensor and the working state of the vehicle; when the steady-state judgment parameters meet preset conditions, determining that the vehicle is in the steady-state operating condition, the preset conditions including at least part of the following: the speed is within a first preset range, the speed change rate is within a second preset range, the intake air charge is within a third preset range, the intake air charge change rate is within a fourth preset range, the water temperature is within a fifth preset range, the temperature is within a sixth preset range, the mass flow rate is within a seventh preset range, the nitrogen oxide sensor is in a normal working state and the vehicle is in a normal working state.

[0010] According to another aspect of the present application, a device for detecting ammonia leakage of a three-way catalytic converter is provided, wherein the three-way catalytic converter is located in a vehicle, and the device comprises: a first acquisition unit, used in an acquisition step, when the vehicle is in a steady-state condition and the oxygen concentration data detected by the nitrogen oxide sensor is greater than a preset value, to acquire the time proportion of the oxygen concentration data within a window that is less than a first threshold value and the oxygen concentration distribution, wherein the window is a preset time period or a time period required for the engine to complete a preset work, the nitrogen oxide sensor is installed in the exhaust pipe of the three-way catalytic converter, the oxygen concentration data is the oxygen concentration of the exhaust gas in the exhaust pipe of the three-way catalytic converter, and the oxygen concentration distribution is the distribution of the oxygen concentration data within the window; a first determination unit, used in a first determination step, to determine whether the time proportion is greater than a second threshold value and whether the oxygen concentration distribution is less than a third threshold value; a second determination unit, used in a second determination step, to determine that ammonia leakage occurs in the three-way catalytic converter when the time proportion is greater than the second threshold value and the oxygen concentration distribution is less than the third threshold value; and to determine that ammonia leakage does not occur in the three-way catalytic converter when the time proportion is less than or equal to the second threshold value or the oxygen concentration distribution is greater than or equal to the third threshold value.

[0011] According to another aspect of the present application, a computer-readable storage medium is provided, wherein the computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute any one of the methods described.

[0012] According to another aspect of the present application, a computer program product is provided, comprising computer instructions, wherein when the computer instructions are executed by a processor, any one of the methods described above is implemented.

[0013] According to another aspect of the present application, an electronic device is provided, comprising: one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the one or more programs include methods for executing any one of the methods described.

[0014] Applying the technical solution of the present application, first, when the vehicle is in a steady-state condition and the oxygen concentration data detected by the nitrogen oxide sensor is greater than a preset value, the time proportion and oxygen concentration distribution of the oxygen concentration data less than the first threshold value in a window are obtained, and then it is determined whether the time proportion is greater than the second threshold value and whether the oxygen concentration distribution is less than the third threshold value. When the time proportion is greater than the second threshold value and the oxygen concentration distribution is less than the third threshold value, it is determined that ammonia leakage occurs in the three-way catalytic converter. When the time proportion is less than or equal to the second threshold value, or the oxygen concentration distribution is greater than or equal to the third threshold value, it is determined that ammonia leakage does not occur in the three-way catalytic converter. The present application determines whether ammonia leakage occurs in the three-way catalytic converter based on the oxygen concentration data and oxygen concentration distribution measured by the nitrogen oxide sensor in a window, thereby achieving the effect of accurately identifying whether ammonia leakage occurs in the three-way catalytic converter. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0016] Figure 1 A hardware structure block diagram of a mobile terminal for performing a method for detecting ammonia leakage of a three-way catalytic converter provided in accordance with an embodiment of the present application is shown;

[0017] Figure 2 A schematic flow chart of a method for detecting ammonia leakage of a three-way catalytic converter provided according to an embodiment of the present application is shown;

[0018] Figure 3 A flow chart of a method for detecting ammonia leakage of a three-way catalytic converter provided according to an embodiment of the present application is shown;

[0019] Figure 4 A schematic diagram of a three-way catalytic converter ammonia leakage detection device provided according to an embodiment of the present application is shown.

[0020] The above drawings include the following reference numerals:

[0021] 102, processor; 104, memory; 106, transmission device; 108, input and output devices. DETAILED DESCRIPTION

[0022] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0023] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0024] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the accompanying drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0025] As introduced in the background technology, it is difficult for traditional sensors in the prior art to accurately identify ammonia leakage in a three-way catalytic converter. To solve the above technical problems, an embodiment of the present application provides a method for detecting ammonia leakage in a three-way catalytic converter, a detection device, a computer-readable storage medium, a computer program product and an electronic device.

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0027] The method embodiments provided in the embodiments of the present application can be executed in a mobile terminal, a computer terminal or a similar computing device. Taking running on a mobile terminal as an example, Figure 1 1 is a hardware structure block diagram of a mobile terminal for detecting ammonia leakage of a three-way catalytic converter according to an embodiment of the present invention. Figure 1 As shown, the mobile terminal may include one or more ( Figure 1Only one is shown in the figure) a processor 102 (the processor 102 may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA) and a memory 104 for storing data, wherein the mobile terminal may also include a transmission device 106 and an input / output device 108 for communication functions. It can be understood by those skilled in the art that Figure 1 The structure shown is for illustration only and does not limit the structure of the mobile terminal. Figure 1 More or fewer components as shown, or with Figure 1 Different configurations shown.

[0028] The memory 104 can be used to store computer programs, for example, software programs and modules of application software, such as the computer program corresponding to the detection method of ammonia leakage of a three-way catalytic converter in the embodiment of the present invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, that is, the method described is implemented. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include a memory remotely arranged relative to the processor 102, and these remote memories may be connected to the mobile terminal via a network. Examples of the network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof. The transmission device 106 is used to receive or send data via a network. The specific example of the network may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, referred to as NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 106 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0029] In this embodiment, a method for detecting ammonia leakage of a three-way catalytic converter running on a mobile terminal, a computer terminal or a similar computing device is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0030] Figure 2 : is a flow chart of a method for detecting ammonia leakage of a three-way catalytic converter according to an embodiment of the present application. Figure 2 As shown, the method comprises the following steps:

[0031] Step S201, an acquisition step, in which, when the vehicle is in a steady-state operating condition and the oxygen concentration data detected by the nitrogen oxide sensor is greater than a preset value, a time ratio in which the oxygen concentration data is less than a first threshold value and an oxygen concentration distribution in a window are acquired, the window being a preset time period or a time period required for the engine to complete a preset work, the nitrogen oxide sensor being installed in the exhaust pipe of the three-way catalytic converter, the oxygen concentration data being the oxygen concentration of the exhaust gas in the exhaust pipe of the three-way catalytic converter, and the oxygen concentration distribution being the distribution of the oxygen concentration data in the window;

[0032] Specifically, the NOx sensor has cross-sensitivity to NOx and ammonia, and cannot effectively distinguish whether the reading is NOx or ammonia. However, the NOx sensor can measure the oxygen concentration in the exhaust gas. The oxygen signal measured by the NOx sensor can intuitively determine the current emission type, so that the ammonia window can be effectively identified based on the oxygen concentration. The engine completes the preset work means that the engine works normally according to the design requirements, achieves the predetermined output power and efficiency, and thus drives the vehicle to run.

[0033] Step S202, a first determination step, determining whether the time proportion is greater than a second threshold, and whether the oxygen concentration distribution is less than a third threshold;

[0034] Step S203, the second determination step, determines that ammonia leakage occurs in the three-way catalytic converter when the time proportion is greater than the second threshold and the oxygen concentration distribution is less than the third threshold; determines that ammonia leakage does not occur in the three-way catalytic converter when the time proportion is less than or equal to the second threshold, or the oxygen concentration distribution is greater than or equal to the third threshold.

[0035] Through the embodiment, first, when the vehicle is in a steady-state condition and the oxygen concentration data detected by the nitrogen oxide sensor is greater than a preset value, the time proportion and oxygen concentration distribution of the oxygen concentration data less than the first threshold value in a window are obtained, and then it is determined whether the time proportion is greater than the second threshold value and whether the oxygen concentration distribution is less than the third threshold value. When the time proportion is greater than the second threshold value and the oxygen concentration distribution is less than the third threshold value, it is determined that ammonia leakage occurs in the three-way catalytic converter. When the time proportion is less than or equal to the second threshold value, or the oxygen concentration distribution is greater than or equal to the third threshold value, it is determined that ammonia leakage does not occur in the three-way catalytic converter. The present application determines whether ammonia leakage occurs in the three-way catalytic converter based on the oxygen concentration data and oxygen concentration distribution measured by the nitrogen oxide sensor in a window, thereby achieving the effect of accurately identifying whether ammonia leakage occurs in the three-way catalytic converter.

[0036] In an optional solution, the method further includes:

[0037] Step S204, when it is determined that the three-way catalytic converter has no ammonia leakage, obtaining the number of the windows where no ammonia leakage has occurred, and the operating conditions of the vehicle corresponding to different windows are the same;

[0038] Specifically, the same operating conditions refer to: the vehicle is in a steady-state condition, and the oxygen concentration data detected by the nitrogen oxide sensor is greater than a preset value.

[0039] Step S205, when the number of the windows where no ammonia leakage occurs is greater than or equal to a fourth threshold, adjusting the air-fuel ratio setting value of the engine in the vehicle so that the adjusted air-fuel ratio setting value is greater than the air-fuel ratio setting value before the adjustment, and acquiring the oxygen concentration data after the air-fuel ratio setting value is adjusted;

[0040] Step S206, at least determining whether ammonia leakage occurs in the three-way catalyst according to the magnitude relationship between the oxygen concentration data after adjusting the air-fuel ratio setting value and the oxygen concentration data before adjusting the air-fuel ratio setting value.

[0041] In the described embodiment, when confirming that no ammonia leakage occurs in the three-way catalytic converter, the number of windows in which no ammonia leakage occurs under the same operating conditions is accumulated. When this number reaches or exceeds a preset threshold, there may be a problem that, due to problems such as aging of the three-way catalytic converter, the oxygen concentration data detected by the nitrogen oxide sensor fluctuates greatly, thereby interfering with the judgment of ammonia leakage. At this time, in order to further ensure the monitoring accuracy of ammonia leakage, the present application adjusts the air-fuel ratio setting value of the vehicle engine to increase it, and then compares the oxygen concentration data before and after adjusting the air-fuel ratio setting value. This comparison result is used as a basis for further judging whether ammonia leakage occurs in the three-way catalytic converter. By dynamically adjusting the air-fuel ratio and observing the change in oxygen concentration, the accuracy and sensitivity of ammonia leakage identification are further improved.

[0042] Specifically, in order to meet the technical route of "equivalence ratio + three-way catalytic converter" of natural gas engines, the air-fuel ratio needs to be controlled within a smaller window so that nitrogen oxides, methane, carbon monoxide and ammonia can be converted efficiently. When the air-fuel ratio is low and deviates from the emission window, the oxygen concentration will continue to decrease, resulting in ammonia leakage. When the three-way catalytic converter is seriously aged, its oxygen storage capacity decreases significantly, which may cause the oxygen concentration measured by the nitrogen oxide sensor to fluctuate greatly and fail to meet the limit conditions of steps S201, S202 and S203. At this time, it is necessary to actively adjust the air-fuel ratio setting value and judge whether ammonia leakage has occurred based on the change in the adjusted oxygen concentration data. Among them, the equivalence ratio refers to the molar ratio of the catalyst to the substrate. In the three-way catalytic converter, it usually refers to the molar ratio of nitrogen oxides to carbon monoxide. The selection of the equivalence ratio has an important influence on the effect of the catalytic reaction. It is usually necessary to determine the optimal equivalence ratio based on the specific reaction conditions and the characteristics of the catalyst.

[0043] In some other exemplary embodiments, at least whether ammonia leakage occurs in the three-way catalytic converter is determined based on the size relationship between the oxygen concentration data after adjusting the air-fuel ratio setting value and the oxygen concentration data before adjusting the air-fuel ratio setting value, including: a third determination step, when the oxygen concentration data after adjusting the air-fuel ratio setting value is less than the oxygen concentration data before adjusting the air-fuel ratio setting value, determining that ammonia leakage occurs in the three-way catalytic converter, and when the oxygen concentration data after adjusting the air-fuel ratio setting value is greater than or equal to the oxygen concentration data before adjusting the air-fuel ratio setting value, determining that ammonia leakage does not occur in the three-way catalytic converter; an adjustment step, continuing to adjust the air-fuel ratio setting value, so that when it is determined that ammonia leakage occurs in the three-way catalytic converter, the current adjustment direction of the air-fuel ratio setting value is the same as the previous adjustment direction, and when it is determined that ammonia leakage does not occur in the three-way catalytic converter, the current adjustment direction is opposite to the previous adjustment direction; a first loop step, cyclically executing the third determination step and the adjustment step a predetermined number of times.

[0044] In the embodiment, firstly, by comparing the oxygen concentration data before and after adjusting the air-fuel ratio setting value, it is possible to determine whether ammonia leakage has occurred in the three-way catalytic converter. When the oxygen concentration data after adjustment is less than the data before adjustment, it is determined that ammonia leakage has occurred; otherwise, it is determined that ammonia leakage has not occurred. Then, according to the judgment result of ammonia leakage, the adjustment direction of the subsequent air-fuel ratio setting value is guided. When it is determined that ammonia leakage has occurred, the same adjustment direction as the previous time is maintained; when ammonia leakage has not occurred, the opposite adjustment direction is adopted. Finally, by cyclically executing the determination step and the adjustment step, continuous monitoring of ammonia leakage in the three-way catalytic converter and dynamic adjustment of the air-fuel ratio setting value are further realized, thereby further achieving the effect of accurately identifying ammonia leakage in the three-way catalytic converter.

[0045] Specifically, the adjustment direction in this adjustment direction and the previous adjustment direction refers to the direction selected when adjusting the air-fuel ratio setting value, including increase or decrease.

[0046] In another optional solution, when it is determined that the three-way catalytic converter has no ammonia leakage, the number of the windows where no ammonia leakage has occurred is obtained, including: a counting step, when it is determined that the three-way catalytic converter has no ammonia leakage, controlling the count value to increase by 1; a second loop step, cyclically executing the acquisition step, the first determination step, the second determination step and the counting step to obtain the number of the windows where no ammonia leakage has occurred. In the embodiment, when it is confirmed that the three-way catalytic converter has no ammonia leakage, the number of windows where no ammonia leakage has occurred is counted by loop counting, thereby achieving the effect of accurately monitoring the number of windows where no ammonia leakage has occurred.

[0047] Specifically, the initial value of the count value is 0; when the number of the windows is greater than or equal to a fourth threshold, the count value is reset to 0.

[0048] In another optional solution, adjusting the air-fuel ratio setting value of the engine in the vehicle includes: adjusting the injection time of the fuel injector of the vehicle or adjusting the throttle opening of the vehicle, thereby adjusting the air-fuel ratio setting value of the engine in the vehicle.

[0049] Specifically, the fuel injector is responsible for spraying fuel into the engine cylinder, and the throttle valve is located in front of the engine intake manifold to control the amount of air entering the cylinder.

[0050] In the embodiment, the amount of fuel injected into the cylinder can be controlled by adjusting the injection time of the injector. When the amount of fuel increases, the air-fuel ratio decreases while the amount of air remains unchanged; when the amount of fuel decreases, the air-fuel ratio increases while the amount of air remains unchanged. By adjusting the opening of the throttle valve, the amount of air entering the cylinder can be controlled. When the throttle valve opening increases, the amount of air entering the cylinder increases, and the air-fuel ratio increases while the amount of fuel injection remains unchanged; when the throttle valve opening decreases, the amount of air entering the cylinder decreases, and the air-fuel ratio decreases while the amount of fuel injection remains unchanged. This adjustment mechanism allows the air-fuel ratio of the engine to be flexibly adjusted as needed.

[0051] In some other embodiments, adjusting the air-fuel ratio setting value of the engine in the vehicle includes: using a step-by-step adjustment method, first fine-tuning the air-fuel ratio setting value by a predetermined step length, and observing the change of the nitrogen oxide sensor reading. If the reading shows an expected change trend, the current adjustment direction and step length are maintained; if the reading does not show an expected change or the change trend is opposite, reverse adjustment is required, and the change of the nitrogen oxide sensor reading continues to be observed, and fine-tuning is performed based on the change result of the reading until the system can accurately determine whether there is ammonia leakage.

[0052] In some other exemplary schemes of the present application, before the acquisition step, the method further includes: acquiring steady-state judgment parameters, the steady-state judgment parameters including at least part of the following: the engine speed, the speed change rate, the intake air charge of the engine, the intake air charge change rate, the engine water temperature, the temperature of the three-way catalytic converter, the mass flow rate of exhaust gas in the exhaust pipe, the working state of the nitrogen oxide sensor and the working state of the vehicle; when the steady-state judgment parameters meet preset conditions, determining that the vehicle is in the steady-state operating condition, the preset conditions including at least part of the following: the speed is within a first preset range, the speed change rate is within a second preset range, the intake air charge is within a third preset range, the intake air charge change rate is within a fourth preset range, the water temperature is within a fifth preset range, the temperature is within a sixth preset range, the mass flow rate is within a seventh preset range, the nitrogen oxide sensor is in a normal working state and the vehicle is in a normal working state.

[0053] In the embodiment, whether the vehicle is in a steady-state condition is determined based on at least part of the engine speed, speed change rate, engine intake charge, intake charge change rate, engine water temperature, temperature of the three-way catalytic converter, mass flow of exhaust gas in the exhaust pipe, working state of the nitrogen oxide sensor, and working state of the vehicle, which can accurately reflect whether the vehicle is in a steady-state condition and ensure accurate judgment of the working state of the vehicle. Since the operating parameters of the engine are relatively stable when the vehicle is in a steady-state condition, this helps to reduce interference caused by changes in working conditions, making the subsequent ammonia leakage detection step more effective, and further improving the accuracy and reliability of ammonia leakage detection.

[0054] In order to enable those skilled in the art to more clearly understand the technical solution of the present application, the implementation process of the method for detecting ammonia leakage of a three-way catalytic converter of the present application will be described in detail below in combination with specific embodiments.

[0055] This embodiment relates to a specific method for detecting ammonia leakage of a three-way catalyst. Figure 3 As shown, the following steps are included:

[0056] Step S1: Obtaining the time proportion of oxygen concentration data in a window that is less than a first threshold and the oxygen concentration distribution;

[0057] Step S2: Determine whether the time proportion is greater than a second threshold value. If the time proportion is greater than the second threshold value, execute step S3; if the time proportion is less than or equal to the second threshold value, execute step S4;

[0058] Step S3: determining whether the oxygen concentration distribution is less than a third threshold value. If the oxygen concentration distribution is less than the third threshold value, determining that ammonia leakage occurs in the three-way catalytic converter. If the oxygen concentration distribution is greater than or equal to the third threshold value, executing step S4.

[0059] Step S4: when it is determined that the three-way catalyst has no ammonia leakage, the control counter value is increased by 1;

[0060] Step S5: Determine whether the count value is greater than or equal to a fourth threshold value. If the count value is greater than or equal to the fourth threshold value, execute step S6. If the count value is less than the fourth threshold value, at least execute steps S1, S2 and S3 in a loop.

[0061] Step S6: increasing the air-fuel ratio setting value of the engine to obtain oxygen concentration data;

[0062] Step S7: Determine whether the oxygen concentration data after adjusting the air-fuel ratio setting value is less than the oxygen concentration data before adjusting the air-fuel ratio setting value. If the oxygen concentration data after adjusting the air-fuel ratio setting value is less than the oxygen concentration data before adjusting the air-fuel ratio setting value, it is determined that ammonia leakage has occurred in the three-way catalytic converter. If the oxygen concentration data after adjusting the air-fuel ratio setting value is greater than or equal to the oxygen concentration data before adjusting the air-fuel ratio setting value, it is determined that no ammonia leakage has occurred in the three-way catalytic converter.

[0063] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0064] The embodiment of the present application also provides a device for detecting ammonia leakage of a three-way catalytic converter. It should be noted that the device for detecting ammonia leakage of a three-way catalytic converter in the embodiment of the present application can be used to execute the detection method for ammonia leakage of a three-way catalytic converter provided in the embodiment of the present application. The device is used to implement the embodiments and preferred implementations, and the descriptions that have been made will not be repeated. As used below, the term "module" can implement a combination of software and / or hardware for a predetermined function. Although the device described in the following embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0065] The following is an introduction to the detection device for ammonia leakage of a three-way catalytic converter provided in an embodiment of the present application.

[0066] Figure 4 Schematic diagram of a device for detecting ammonia leakage of a three-way catalytic converter according to an embodiment of the present application. Figure 4 As shown, the device comprises:

[0067] A first acquisition unit 10 is used for an acquisition step, in which, when the vehicle is in a steady-state condition and the oxygen concentration data detected by the nitrogen oxide sensor is greater than a preset value, a time ratio of the oxygen concentration data within a window that is less than a first threshold value and an oxygen concentration distribution are acquired, wherein the window is a preset time period or a time period required for the engine to complete a preset work, the nitrogen oxide sensor is installed in the exhaust pipe of the three-way catalytic converter, the oxygen concentration data is the oxygen concentration of the exhaust gas in the exhaust pipe of the three-way catalytic converter, and the oxygen concentration distribution is the distribution of the oxygen concentration data within the window;

[0068] Specifically, the NOx sensor has cross-sensitivity to NOx and ammonia, and cannot effectively distinguish whether the reading is NOx or ammonia. However, the NOx sensor can measure the oxygen concentration in the exhaust gas. The oxygen signal measured by the NOx sensor can intuitively determine the current emission type, so that the ammonia window can be effectively identified based on the oxygen concentration. The engine completes the preset work means that the engine works normally according to the design requirements, achieves the predetermined output power and efficiency, and thus drives the vehicle to run.

[0069] A first determination unit 20, used in a first determination step, to determine whether the time proportion is greater than a second threshold, and whether the oxygen concentration distribution is less than a third threshold;

[0070] The second determination unit 30 is used for the second determination step, and determines that ammonia leakage occurs in the three-way catalytic converter when the time proportion is greater than the second threshold and the oxygen concentration distribution is less than the third threshold; and determines that ammonia leakage does not occur in the three-way catalytic converter when the time proportion is less than or equal to the second threshold, or the oxygen concentration distribution is greater than or equal to the third threshold.

[0071] Through the embodiment, the first acquisition unit, when the vehicle is in a steady-state condition and the oxygen concentration data detected by the nitrogen oxide sensor is greater than a preset value, obtains the time proportion and oxygen concentration distribution of the oxygen concentration data less than the first threshold in a window, determines whether the time proportion is greater than the second threshold, and whether the oxygen concentration distribution is less than the third threshold through the first determination unit, determines that ammonia leakage occurs in the three-way catalytic converter when the time proportion is greater than the second threshold and the oxygen concentration distribution is less than the third threshold through the second determination unit, and determines that ammonia leakage does not occur in the three-way catalytic converter when the time proportion is less than or equal to the second threshold, or when the oxygen concentration distribution is greater than or equal to the third threshold. The present application determines whether ammonia leakage occurs in the three-way catalytic converter based on the oxygen concentration data and oxygen concentration distribution measured by the nitrogen oxide sensor in a window, thereby achieving the effect of accurately identifying whether ammonia leakage occurs in the three-way catalytic converter.

[0072] In another optional solution, the device further includes:

[0073] a second acquisition unit, configured to acquire the number of the windows where no ammonia leakage occurs when it is determined that no ammonia leakage occurs in the three-way catalytic converter, wherein different windows correspond to the same operating conditions of the vehicle;

[0074] Specifically, the same operating conditions refer to: the vehicle is in a steady-state condition, and the oxygen concentration data detected by the nitrogen oxide sensor is greater than a preset value.

[0075] an adjusting unit, configured to adjust an air-fuel ratio setting value of the engine in the vehicle when the number of the windows where no ammonia leakage occurs is greater than or equal to a fourth threshold value, so that the adjusted air-fuel ratio setting value is greater than the air-fuel ratio setting value before the adjustment, and to obtain the oxygen concentration data after the air-fuel ratio setting value is adjusted;

[0076] The third determination unit is used to at least determine whether ammonia leakage occurs in the three-way catalyst according to the relationship between the oxygen concentration data after adjusting the air-fuel ratio setting value and the oxygen concentration data before adjusting the air-fuel ratio setting value.

[0077] In the described embodiment, when confirming that no ammonia leakage occurs in the three-way catalytic converter, the number of windows in which no ammonia leakage occurs under the same operating conditions is accumulated. When this number reaches or exceeds a preset threshold, there may be a problem that, due to problems such as aging of the three-way catalytic converter, the oxygen concentration data detected by the nitrogen oxide sensor fluctuates greatly, thereby interfering with the judgment of ammonia leakage. At this time, in order to further ensure the monitoring accuracy of ammonia leakage, the present application adjusts the air-fuel ratio setting value of the vehicle engine to increase it, and then compares the oxygen concentration data before and after adjusting the air-fuel ratio setting value. This comparison result is used as a basis for further judging whether ammonia leakage occurs in the three-way catalytic converter. By dynamically adjusting the air-fuel ratio and observing the change in oxygen concentration, the accuracy and sensitivity of ammonia leakage identification are further improved.

[0078] Specifically, in order to meet the technical route of "equivalence ratio + three-way catalytic converter" of natural gas engines, the air-fuel ratio needs to be controlled within a smaller window so that nitrogen oxides, methane, carbon monoxide and ammonia can be converted efficiently. When the air-fuel ratio is low and deviates from the emission window, the oxygen concentration will continue to decrease, resulting in ammonia leakage. When the three-way catalytic converter is seriously aged, its oxygen storage capacity decreases significantly, which may cause the oxygen concentration measured by the nitrogen oxide sensor to fluctuate greatly and fail to meet the limit conditions of steps S201, S202 and S203. At this time, it is necessary to actively adjust the air-fuel ratio setting value and judge whether ammonia leakage has occurred based on the change in the adjusted oxygen concentration data. Among them, the equivalence ratio refers to the molar ratio of the catalyst to the substrate. In the three-way catalytic converter, it usually refers to the molar ratio of nitrogen oxides to carbon monoxide. The selection of the equivalence ratio has an important influence on the effect of the catalytic reaction. It is usually necessary to determine the optimal equivalence ratio based on the specific reaction conditions and the characteristics of the catalyst.

[0079] In another optional solution, the third determining unit includes:

[0080] a determination module, used in a third determination step, to determine that ammonia leakage occurs in the three-way catalytic converter when the oxygen concentration data after adjusting the air-fuel ratio setting value is less than the oxygen concentration data before adjusting the air-fuel ratio setting value, and to determine that ammonia leakage does not occur in the three-way catalytic converter when the oxygen concentration data after adjusting the air-fuel ratio setting value is greater than or equal to the oxygen concentration data before adjusting the air-fuel ratio setting value;

[0081] A first adjustment module, used for the adjustment step, continuing to adjust the air-fuel ratio setting value, so that when it is determined that ammonia leakage occurs in the three-way catalyst, the current adjustment direction of the air-fuel ratio setting value is the same as the previous adjustment direction, and when it is determined that ammonia leakage does not occur in the three-way catalyst, the current adjustment direction is opposite to the previous adjustment direction;

[0082] The first execution module is used for the first loop step to loop the third determination step and the adjustment step for a predetermined number of times.

[0083] In the embodiment, firstly, by comparing the oxygen concentration data before and after adjusting the air-fuel ratio setting value, it is possible to determine whether ammonia leakage has occurred in the three-way catalytic converter. When the oxygen concentration data after adjustment is less than the data before adjustment, it is determined that ammonia leakage has occurred; otherwise, it is determined that ammonia leakage has not occurred. Then, according to the judgment result of ammonia leakage, the adjustment direction of the subsequent air-fuel ratio setting value is guided. When it is determined that ammonia leakage has occurred, the same adjustment direction as the previous time is maintained; when ammonia leakage has not occurred, the opposite adjustment direction is adopted. Finally, by cyclically executing the determination step and the adjustment step, continuous monitoring of ammonia leakage in the three-way catalytic converter and dynamic adjustment of the air-fuel ratio setting value are further realized, thereby further achieving the effect of accurately identifying ammonia leakage in the three-way catalytic converter.

[0084] Specifically, the adjustment direction in this adjustment direction and the previous adjustment direction refers to the direction selected when adjusting the air-fuel ratio setting value, including increase or decrease.

[0085] In some other exemplary embodiments, the second acquiring unit includes:

[0086] A control module, used for a counting step, in which, when it is determined that no ammonia leakage occurs in the three-way catalytic converter, the count value is controlled to increase by 1;

[0087] The second execution module is used for the second loop step, and loops through the acquisition step, the first determination step, the second determination step, and the counting step to obtain the number of the windows where no ammonia leakage occurs.

[0088] In the embodiment, when it is confirmed that no ammonia leakage occurs in the three-way catalytic converter, the number of windows where no ammonia leakage occurs is counted by cycle counting, thereby achieving the effect of accurately monitoring the number of windows where no ammonia leakage occurs.

[0089] Specifically, the initial value of the count value is 0; when the number of the windows is greater than or equal to a fourth threshold, the count value is reset to 0.

[0090] In another optional solution, the adjustment unit includes: a second adjustment module, which is used to adjust the injection time of the fuel injector of the vehicle or adjust the throttle opening of the vehicle, so as to adjust the air-fuel ratio setting value of the engine in the vehicle.

[0091] Specifically, the fuel injector is responsible for spraying fuel into the engine cylinder, and the throttle valve is located in front of the engine intake manifold to control the amount of air entering the cylinder.

[0092] In the embodiment, the amount of fuel injected into the cylinder can be controlled by adjusting the injection time of the injector. When the amount of fuel increases, the air-fuel ratio decreases while the amount of air remains unchanged; when the amount of fuel decreases, the air-fuel ratio increases while the amount of air remains unchanged. By adjusting the opening of the throttle valve, the amount of air entering the cylinder can be controlled. When the throttle valve opening increases, the amount of air entering the cylinder increases, and the air-fuel ratio increases while the amount of fuel injection remains unchanged; when the throttle valve opening decreases, the amount of air entering the cylinder decreases, and the air-fuel ratio decreases while the amount of fuel injection remains unchanged. This adjustment mechanism allows the air-fuel ratio of the engine to be flexibly adjusted as needed.

[0093] In some other embodiments, adjusting the air-fuel ratio setting value of the engine in the vehicle includes: using a step-by-step adjustment method, first fine-tuning the air-fuel ratio setting value by a predetermined step length, and observing the change of the nitrogen oxide sensor reading. If the reading shows an expected change trend, the current adjustment direction and step length are maintained; if the reading does not show an expected change or the change trend is opposite, reverse adjustment is required, and the change of the nitrogen oxide sensor reading continues to be observed, and fine-tuning is performed based on the change result of the reading until the system can accurately determine whether there is ammonia leakage.

[0094] In some further exemplary embodiments of the present application, the device further comprises:

[0095] a third acquisition unit, configured to acquire steady-state determination parameters before the acquisition step, wherein the steady-state determination parameters include at least part of the following: the speed of the engine, the speed change rate, the intake air charge of the engine, the intake air charge change rate, the water temperature of the engine, the temperature of the three-way catalytic converter, the mass flow rate of the exhaust gas in the exhaust pipe, the working state of the nitrogen oxide sensor, and the working state of the vehicle;

[0096] A fourth determination unit is used to determine that the vehicle is in the steady-state operating condition when the steady-state judgment parameter meets preset conditions, and the preset conditions include at least part of the following: the speed is within a first preset range, the speed change rate is within a second preset range, the intake charge is within a third preset range, the intake charge change rate is within a fourth preset range, the water temperature is within a fifth preset range, the temperature is within a sixth preset range, the mass flow rate is within a seventh preset range, the nitrogen oxide sensor is in a normal working state, and the vehicle is in a normal working state.

[0097] In the embodiment, whether the vehicle is in a steady-state condition is determined based on at least part of the engine speed, speed change rate, engine intake charge, intake charge change rate, engine water temperature, temperature of the three-way catalytic converter, mass flow of exhaust gas in the exhaust pipe, working state of the nitrogen oxide sensor, and working state of the vehicle, which can accurately reflect whether the vehicle is in a steady-state condition and ensure accurate judgment of the working state of the vehicle. Since the operating parameters of the engine are relatively stable when the vehicle is in a steady-state condition, this helps to reduce interference caused by changes in working conditions, making the subsequent ammonia leakage detection step more effective, and further improving the accuracy and reliability of ammonia leakage detection.

[0098] The three-way catalytic converter ammonia leakage detection device includes a processor and a memory, wherein the first acquisition unit, the first determination unit, and the second determination unit are stored in the memory as program units, and the processor executes the program units stored in the memory to implement corresponding functions. The modules are all located in the same processor; or, the modules are located in different processors in any combination.

[0099] The processor includes a kernel, which retrieves the corresponding program unit from the memory. One or more kernels can be provided, and the problem of difficulty in accurately identifying ammonia leakage in the three-way catalytic converter in the prior art can be at least solved by adjusting kernel parameters.

[0100] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0101] An embodiment of the present invention provides a computer-readable storage medium, which includes a stored program, wherein when the program is running, the device where the computer-readable storage medium is located is controlled to execute the method for detecting ammonia leakage of a three-way catalyst.

[0102] Specifically, the method for detecting ammonia leakage of a three-way catalytic converter includes:

[0103] Step S201, an acquisition step, in which, when the vehicle is in a steady-state operating condition and the oxygen concentration data detected by the nitrogen oxide sensor is greater than a preset value, a time ratio in which the oxygen concentration data is less than a first threshold value and an oxygen concentration distribution in a window are acquired, the window being a preset time period or a time period required for the engine to complete a preset work, the nitrogen oxide sensor being installed in the exhaust pipe of the three-way catalytic converter, the oxygen concentration data being the oxygen concentration of the exhaust gas in the exhaust pipe of the three-way catalytic converter, and the oxygen concentration distribution being the distribution of the oxygen concentration data in the window;

[0104] Specifically, the NOx sensor has cross-sensitivity to NOx and ammonia, and cannot effectively distinguish whether the reading is NOx or ammonia. However, the NOx sensor can measure the oxygen concentration in the exhaust gas. The oxygen signal measured by the NOx sensor can intuitively determine the current emission type, so that the ammonia window can be effectively identified based on the oxygen concentration. The engine completes the preset work means that the engine works normally according to the design requirements, achieves the predetermined output power and efficiency, and thus drives the vehicle to run.

[0105] Step S202, a first determination step, determining whether the time proportion is greater than a second threshold, and whether the oxygen concentration distribution is less than a third threshold;

[0106] Step S203, the second determination step, determines that ammonia leakage occurs in the three-way catalytic converter when the time proportion is greater than the second threshold and the oxygen concentration distribution is less than the third threshold; determines that ammonia leakage does not occur in the three-way catalytic converter when the time proportion is less than or equal to the second threshold, or the oxygen concentration distribution is greater than or equal to the third threshold.

[0107] Optionally, the method also includes: when it is determined that no ammonia leakage occurs in the three-way catalytic converter, obtaining the number of windows where no ammonia leakage occurs, and different windows correspond to the same operating conditions of the vehicle; when the number of windows where no ammonia leakage occurs is greater than or equal to a fourth threshold, adjusting the air-fuel ratio setting value of the engine in the vehicle so that the adjusted air-fuel ratio setting value is greater than the air-fuel ratio setting value before adjustment, and obtaining the oxygen concentration data after adjusting the air-fuel ratio setting value; based on the relationship between the oxygen concentration data after adjusting the air-fuel ratio setting value and the oxygen concentration data before adjusting the air-fuel ratio setting value, at least determining whether ammonia leakage occurs in the three-way catalytic converter.

[0108] Optionally, based on the relationship between the oxygen concentration data after adjusting the air-fuel ratio setting value and the oxygen concentration data before adjusting the air-fuel ratio setting value, at least whether the three-way catalytic converter has ammonia leakage is determined, including: a third determination step, when the oxygen concentration data after adjusting the air-fuel ratio setting value is less than the oxygen concentration data before adjusting the air-fuel ratio setting value, determining that the three-way catalytic converter has ammonia leakage, when the oxygen concentration data after adjusting the air-fuel ratio setting value is greater than or equal to the oxygen concentration data before adjusting the air-fuel ratio setting value, determining that the three-way catalytic converter has not ammonia leakage; an adjustment step, continuing to adjust the air-fuel ratio setting value, so that when it is determined that the three-way catalytic converter has ammonia leakage, the current adjustment direction of the air-fuel ratio setting value is the same as the previous adjustment direction, and when it is determined that the three-way catalytic converter has not ammonia leakage, the current adjustment direction is opposite to the previous adjustment direction; a first loop step, cyclically executing the third determination step and the adjustment step a predetermined number of times.

[0109] Optionally, when it is determined that no ammonia leakage occurs in the three-way catalytic converter, the number of the windows where no ammonia leakage occurs is obtained, including: a counting step, when it is determined that no ammonia leakage occurs in the three-way catalytic converter, controlling the count value to increase by 1; and a second loop step, cyclically executing the obtaining step, the first determining step, the second determining step and the counting step to obtain the number of the windows where no ammonia leakage occurs.

[0110] Optionally, adjusting the air-fuel ratio setting value of the engine in the vehicle includes: adjusting the injection time of the fuel injector of the vehicle or adjusting the throttle opening of the vehicle, thereby adjusting the air-fuel ratio setting value of the engine in the vehicle.

[0111] Optionally, before the acquisition step, the method further includes: acquiring steady-state judgment parameters, the steady-state judgment parameters including at least part of the following: the engine speed, the speed change rate, the intake air charge of the engine, the intake air charge change rate, the engine water temperature, the temperature of the three-way catalytic converter, the mass flow rate of exhaust gas in the exhaust pipe, the working state of the nitrogen oxide sensor and the working state of the vehicle; when the steady-state judgment parameters meet preset conditions, determining that the vehicle is in the steady-state operating condition, the preset conditions including at least part of the following: the speed is within a first preset range, the speed change rate is within a second preset range, the intake air charge is within a third preset range, the intake air charge change rate is within a fourth preset range, the water temperature is within a fifth preset range, the temperature is within a sixth preset range, the mass flow rate is within a seventh preset range, the nitrogen oxide sensor is in a normal working state and the vehicle is in a normal working state.

[0112] An embodiment of the present invention provides a processor, which is used to run a program, wherein the method for detecting ammonia leakage of a three-way catalytic converter is executed when the program is running.

[0113] Specifically, the method for detecting ammonia leakage of a three-way catalytic converter includes:

[0114] Step S201, an acquisition step, in which, when the vehicle is in a steady-state operating condition and the oxygen concentration data detected by the nitrogen oxide sensor is greater than a preset value, a time ratio in which the oxygen concentration data is less than a first threshold value and an oxygen concentration distribution in a window are acquired, the window being a preset time period or a time period required for the engine to complete a preset work, the nitrogen oxide sensor being installed in the exhaust pipe of the three-way catalytic converter, the oxygen concentration data being the oxygen concentration of the exhaust gas in the exhaust pipe of the three-way catalytic converter, and the oxygen concentration distribution being the distribution of the oxygen concentration data in the window;

[0115] Specifically, the NOx sensor has cross-sensitivity to NOx and ammonia, and cannot effectively distinguish whether the reading is NOx or ammonia. However, the NOx sensor can measure the oxygen concentration in the exhaust gas. The oxygen signal measured by the NOx sensor can intuitively determine the current emission type, so that the ammonia window can be effectively identified based on the oxygen concentration. The engine completes the preset work means that the engine works normally according to the design requirements, achieves the predetermined output power and efficiency, and thus drives the vehicle to run.

[0116] Step S202, a first determination step, determining whether the time proportion is greater than a second threshold, and whether the oxygen concentration distribution is less than a third threshold;

[0117] Step S203, the second determination step, determines that ammonia leakage occurs in the three-way catalytic converter when the time proportion is greater than the second threshold and the oxygen concentration distribution is less than the third threshold; determines that ammonia leakage does not occur in the three-way catalytic converter when the time proportion is less than or equal to the second threshold, or the oxygen concentration distribution is greater than or equal to the third threshold.

[0118] Optionally, the method also includes: when it is determined that no ammonia leakage occurs in the three-way catalytic converter, obtaining the number of windows where no ammonia leakage occurs, and different windows correspond to the same operating conditions of the vehicle; when the number of windows where no ammonia leakage occurs is greater than or equal to a fourth threshold, adjusting the air-fuel ratio setting value of the engine in the vehicle so that the adjusted air-fuel ratio setting value is greater than the air-fuel ratio setting value before adjustment, and obtaining the oxygen concentration data after adjusting the air-fuel ratio setting value; based on the relationship between the oxygen concentration data after adjusting the air-fuel ratio setting value and the oxygen concentration data before adjusting the air-fuel ratio setting value, at least determining whether ammonia leakage occurs in the three-way catalytic converter.

[0119] Optionally, based on the relationship between the oxygen concentration data after adjusting the air-fuel ratio setting value and the oxygen concentration data before adjusting the air-fuel ratio setting value, at least whether the three-way catalytic converter has ammonia leakage is determined, including: a third determination step, when the oxygen concentration data after adjusting the air-fuel ratio setting value is less than the oxygen concentration data before adjusting the air-fuel ratio setting value, determining that the three-way catalytic converter has ammonia leakage, when the oxygen concentration data after adjusting the air-fuel ratio setting value is greater than or equal to the oxygen concentration data before adjusting the air-fuel ratio setting value, determining that the three-way catalytic converter has not ammonia leakage; an adjustment step, continuing to adjust the air-fuel ratio setting value, so that when it is determined that the three-way catalytic converter has ammonia leakage, the current adjustment direction of the air-fuel ratio setting value is the same as the previous adjustment direction, and when it is determined that the three-way catalytic converter has not ammonia leakage, the current adjustment direction is opposite to the previous adjustment direction; a first loop step, cyclically executing the third determination step and the adjustment step a predetermined number of times.

[0120] Optionally, when it is determined that no ammonia leakage occurs in the three-way catalytic converter, the number of the windows where no ammonia leakage occurs is obtained, including: a counting step, when it is determined that no ammonia leakage occurs in the three-way catalytic converter, controlling the count value to increase by 1; and a second loop step, cyclically executing the obtaining step, the first determining step, the second determining step and the counting step to obtain the number of the windows where no ammonia leakage occurs.

[0121] Optionally, adjusting the air-fuel ratio setting value of the engine in the vehicle includes: adjusting the injection time of the fuel injector of the vehicle or adjusting the throttle opening of the vehicle, thereby adjusting the air-fuel ratio setting value of the engine in the vehicle.

[0122] Optionally, before the acquisition step, the method further includes: acquiring steady-state judgment parameters, the steady-state judgment parameters including at least part of the following: the engine speed, the speed change rate, the intake air charge of the engine, the intake air charge change rate, the engine water temperature, the temperature of the three-way catalytic converter, the mass flow rate of exhaust gas in the exhaust pipe, the working state of the nitrogen oxide sensor and the working state of the vehicle; when the steady-state judgment parameters meet preset conditions, determining that the vehicle is in the steady-state operating condition, the preset conditions including at least part of the following: the speed is within a first preset range, the speed change rate is within a second preset range, the intake air charge is within a third preset range, the intake air charge change rate is within a fourth preset range, the water temperature is within a fifth preset range, the temperature is within a sixth preset range, the mass flow rate is within a seventh preset range, the nitrogen oxide sensor is in a normal working state and the vehicle is in a normal working state.

[0123] The present application also provides a computer program product, including computer instructions, which, when executed by a processor, implement at least the following method steps:

[0124] Step S201, an acquisition step, in which, when the vehicle is in a steady-state operating condition and the oxygen concentration data detected by the nitrogen oxide sensor is greater than a preset value, a time ratio in which the oxygen concentration data is less than a first threshold value and an oxygen concentration distribution in a window are acquired, the window being a preset time period or a time period required for the engine to complete a preset work, the nitrogen oxide sensor being installed in the exhaust pipe of the three-way catalytic converter, the oxygen concentration data being the oxygen concentration of the exhaust gas in the exhaust pipe of the three-way catalytic converter, and the oxygen concentration distribution being the distribution of the oxygen concentration data in the window;

[0125] Specifically, the NOx sensor has cross-sensitivity to NOx and ammonia, and cannot effectively distinguish whether the reading is NOx or ammonia. However, the NOx sensor can measure the oxygen concentration in the exhaust gas. The oxygen signal measured by the NOx sensor can intuitively determine the current emission type, so that the ammonia window can be effectively identified based on the oxygen concentration. The engine completes the preset work means that the engine works normally according to the design requirements, achieves the predetermined output power and efficiency, and thus drives the vehicle to run.

[0126] Step S202, a first determination step, determining whether the time proportion is greater than a second threshold, and whether the oxygen concentration distribution is less than a third threshold;

[0127] Step S203, the second determination step, determines that ammonia leakage occurs in the three-way catalytic converter when the time proportion is greater than the second threshold and the oxygen concentration distribution is less than the third threshold; determines that ammonia leakage does not occur in the three-way catalytic converter when the time proportion is less than or equal to the second threshold, or the oxygen concentration distribution is greater than or equal to the third threshold.

[0128] Optionally, the method also includes: when it is determined that no ammonia leakage occurs in the three-way catalytic converter, obtaining the number of windows where no ammonia leakage occurs, and different windows correspond to the same operating conditions of the vehicle; when the number of windows where no ammonia leakage occurs is greater than or equal to a fourth threshold, adjusting the air-fuel ratio setting value of the engine in the vehicle so that the adjusted air-fuel ratio setting value is greater than the air-fuel ratio setting value before adjustment, and obtaining the oxygen concentration data after adjusting the air-fuel ratio setting value; based on the relationship between the oxygen concentration data after adjusting the air-fuel ratio setting value and the oxygen concentration data before adjusting the air-fuel ratio setting value, at least determining whether ammonia leakage occurs in the three-way catalytic converter.

[0129] Optionally, based on the relationship between the oxygen concentration data after adjusting the air-fuel ratio setting value and the oxygen concentration data before adjusting the air-fuel ratio setting value, at least whether the three-way catalytic converter has ammonia leakage is determined, including: a third determination step, when the oxygen concentration data after adjusting the air-fuel ratio setting value is less than the oxygen concentration data before adjusting the air-fuel ratio setting value, determining that the three-way catalytic converter has ammonia leakage, when the oxygen concentration data after adjusting the air-fuel ratio setting value is greater than or equal to the oxygen concentration data before adjusting the air-fuel ratio setting value, determining that the three-way catalytic converter has not ammonia leakage; an adjustment step, continuing to adjust the air-fuel ratio setting value, so that when it is determined that the three-way catalytic converter has ammonia leakage, the current adjustment direction of the air-fuel ratio setting value is the same as the previous adjustment direction, and when it is determined that the three-way catalytic converter has not ammonia leakage, the current adjustment direction is opposite to the previous adjustment direction; a first loop step, cyclically executing the third determination step and the adjustment step a predetermined number of times.

[0130] Optionally, when it is determined that no ammonia leakage occurs in the three-way catalytic converter, the number of the windows where no ammonia leakage occurs is obtained, including: a counting step, when it is determined that no ammonia leakage occurs in the three-way catalytic converter, controlling the count value to increase by 1; and a second loop step, cyclically executing the obtaining step, the first determining step, the second determining step and the counting step to obtain the number of the windows where no ammonia leakage occurs.

[0131] Optionally, adjusting the air-fuel ratio setting value of the engine in the vehicle includes: adjusting the injection time of the fuel injector of the vehicle or adjusting the throttle opening of the vehicle, thereby adjusting the air-fuel ratio setting value of the engine in the vehicle.

[0132] Optionally, before the acquisition step, the method further includes: acquiring steady-state judgment parameters, the steady-state judgment parameters including at least part of the following: the engine speed, the speed change rate, the intake air charge of the engine, the intake air charge change rate, the engine water temperature, the temperature of the three-way catalytic converter, the mass flow rate of exhaust gas in the exhaust pipe, the working state of the nitrogen oxide sensor and the working state of the vehicle; when the steady-state judgment parameters meet preset conditions, determining that the vehicle is in the steady-state operating condition, the preset conditions including at least part of the following: the speed is within a first preset range, the speed change rate is within a second preset range, the intake air charge is within a third preset range, the intake air charge change rate is within a fourth preset range, the water temperature is within a fifth preset range, the temperature is within a sixth preset range, the mass flow rate is within a seventh preset range, the nitrogen oxide sensor is in a normal working state and the vehicle is in a normal working state.

[0133] The embodiment of the present application also provides an electronic device, including: one or more processors, a memory, and one or more programs, wherein the one or more programs include a method for executing any one of the methods described. When the program is executed, at least the following steps are implemented:

[0134] Step S201, an acquisition step, in which, when the vehicle is in a steady-state operating condition and the oxygen concentration data detected by the nitrogen oxide sensor is greater than a preset value, a time ratio in which the oxygen concentration data is less than a first threshold value and an oxygen concentration distribution in a window are acquired, the window being a preset time period or a time period required for the engine to complete a preset work, the nitrogen oxide sensor being installed in the exhaust pipe of the three-way catalytic converter, the oxygen concentration data being the oxygen concentration of the exhaust gas in the exhaust pipe of the three-way catalytic converter, and the oxygen concentration distribution being the distribution of the oxygen concentration data in the window;

[0135] Specifically, the NOx sensor has cross-sensitivity to NOx and ammonia, and cannot effectively distinguish whether the reading is NOx or ammonia. However, the NOx sensor can measure the oxygen concentration in the exhaust gas. The oxygen signal measured by the NOx sensor can intuitively determine the current emission type, so that the ammonia window can be effectively identified based on the oxygen concentration. The engine completes the preset work means that the engine works normally according to the design requirements, achieves the predetermined output power and efficiency, and thus drives the vehicle to run.

[0136] Step S202, a first determination step, determining whether the time proportion is greater than a second threshold, and whether the oxygen concentration distribution is less than a third threshold;

[0137] Step S203, the second determination step, determines that ammonia leakage occurs in the three-way catalytic converter when the time proportion is greater than the second threshold and the oxygen concentration distribution is less than the third threshold; determines that ammonia leakage does not occur in the three-way catalytic converter when the time proportion is less than or equal to the second threshold, or the oxygen concentration distribution is greater than or equal to the third threshold.

[0138] Optionally, the method also includes: when it is determined that no ammonia leakage occurs in the three-way catalytic converter, obtaining the number of windows where no ammonia leakage occurs, and different windows correspond to the same operating conditions of the vehicle; when the number of windows where no ammonia leakage occurs is greater than or equal to a fourth threshold, adjusting the air-fuel ratio setting value of the engine in the vehicle so that the adjusted air-fuel ratio setting value is greater than the air-fuel ratio setting value before adjustment, and obtaining the oxygen concentration data after adjusting the air-fuel ratio setting value; based on the relationship between the oxygen concentration data after adjusting the air-fuel ratio setting value and the oxygen concentration data before adjusting the air-fuel ratio setting value, at least determining whether ammonia leakage occurs in the three-way catalytic converter.

[0139] Optionally, based on the relationship between the oxygen concentration data after adjusting the air-fuel ratio setting value and the oxygen concentration data before adjusting the air-fuel ratio setting value, at least whether the three-way catalytic converter has ammonia leakage is determined, including: a third determination step, when the oxygen concentration data after adjusting the air-fuel ratio setting value is less than the oxygen concentration data before adjusting the air-fuel ratio setting value, determining that the three-way catalytic converter has ammonia leakage, when the oxygen concentration data after adjusting the air-fuel ratio setting value is greater than or equal to the oxygen concentration data before adjusting the air-fuel ratio setting value, determining that the three-way catalytic converter has not ammonia leakage; an adjustment step, continuing to adjust the air-fuel ratio setting value, so that when it is determined that the three-way catalytic converter has ammonia leakage, the current adjustment direction of the air-fuel ratio setting value is the same as the previous adjustment direction, and when it is determined that the three-way catalytic converter has not ammonia leakage, the current adjustment direction is opposite to the previous adjustment direction; a first loop step, cyclically executing the third determination step and the adjustment step a predetermined number of times.

[0140] Optionally, when it is determined that no ammonia leakage occurs in the three-way catalytic converter, the number of the windows where no ammonia leakage occurs is obtained, including: a counting step, when it is determined that no ammonia leakage occurs in the three-way catalytic converter, controlling the count value to increase by 1; and a second loop step, cyclically executing the obtaining step, the first determining step, the second determining step and the counting step to obtain the number of the windows where no ammonia leakage occurs.

[0141] Optionally, adjusting the air-fuel ratio setting value of the engine in the vehicle includes: adjusting the injection time of the fuel injector of the vehicle or adjusting the throttle opening of the vehicle, thereby adjusting the air-fuel ratio setting value of the engine in the vehicle.

[0142] Optionally, before the acquisition step, the method further includes: acquiring steady-state judgment parameters, the steady-state judgment parameters including at least part of the following: the engine speed, the speed change rate, the intake air charge of the engine, the intake air charge change rate, the engine water temperature, the temperature of the three-way catalytic converter, the mass flow rate of exhaust gas in the exhaust pipe, the working state of the nitrogen oxide sensor and the working state of the vehicle; when the steady-state judgment parameters meet preset conditions, determining that the vehicle is in the steady-state operating condition, the preset conditions including at least part of the following: the speed is within a first preset range, the speed change rate is within a second preset range, the intake air charge is within a third preset range, the intake air charge change rate is within a fourth preset range, the water temperature is within a fifth preset range, the temperature is within a sixth preset range, the mass flow rate is within a seventh preset range, the nitrogen oxide sensor is in a normal working state and the vehicle is in a normal working state.

[0143] The devices in this article can be servers, PCs, PADs, mobile phones, etc.

[0144] Obviously, those skilled in the art should understand that the modules or steps of the present invention described above can be implemented by a general-purpose computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be executed in a different order than herein, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Thus, the present invention is not limited to any specific combination of hardware and software.

[0145] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0146] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0147] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0148] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0149] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0150] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0151] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0152] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0153] From the above description, it can be seen that the embodiments described in this application achieve the following technical effects:

[0154] 1) The method for detecting ammonia leakage of a three-way catalytic converter of the present application first obtains the time proportion of the oxygen concentration data less than the first threshold value and the oxygen concentration distribution in a window when the vehicle is in a steady-state condition and the oxygen concentration data detected by the nitrogen oxide sensor is greater than a preset value, and then determines whether the time proportion is greater than the second threshold value and whether the oxygen concentration distribution is less than the third threshold value. When the time proportion is greater than the second threshold value and the oxygen concentration distribution is less than the third threshold value, it is determined that ammonia leakage occurs in the three-way catalytic converter. When the time proportion is less than or equal to the second threshold value or the oxygen concentration distribution is greater than or equal to the third threshold value, it is determined that ammonia leakage does not occur in the three-way catalytic converter. The present application determines whether ammonia leakage occurs in the three-way catalytic converter based on the oxygen concentration data and oxygen concentration distribution measured by the nitrogen oxide sensor in a window, thereby achieving the effect of accurately identifying whether ammonia leakage occurs in the three-way catalytic converter.

[0155] 2) The detection device for ammonia leakage of the three-way catalytic converter of the present application obtains the time proportion and oxygen concentration distribution of the oxygen concentration data less than the first threshold value in a window through the first acquisition unit when the vehicle is in a steady-state condition and the oxygen concentration data detected by the nitrogen oxide sensor is greater than a preset value, determines whether the time proportion is greater than the second threshold value and whether the oxygen concentration distribution is less than the third threshold value through the first determination unit, determines that ammonia leakage occurs in the three-way catalytic converter through the second determination unit when the time proportion is greater than the second threshold value and the oxygen concentration distribution is less than the third threshold value, and determines that ammonia leakage does not occur in the three-way catalytic converter when the time proportion is less than or equal to the second threshold value or when the oxygen concentration distribution is greater than or equal to the third threshold value. The present application determines whether ammonia leakage occurs in the three-way catalytic converter based on the oxygen concentration data and oxygen concentration distribution measured by the nitrogen oxide sensor in a window, thereby achieving the effect of accurately identifying whether ammonia leakage occurs in the three-way catalytic converter.

[0156] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for detecting ammonia leakage of a three-way catalytic converter, wherein the three-way catalytic converter is located in a vehicle, characterized in that: The method comprises: an acquisition step, in which, when the vehicle is in a steady-state operating condition and the oxygen concentration data detected by the nitrogen oxide sensor is greater than a preset value, a time proportion in which the oxygen concentration data is less than a first threshold value and an oxygen concentration distribution in a window are acquired, the window being a preset time period or a time period required for the engine to complete a preset work, the nitrogen oxide sensor being installed in the exhaust pipe of the three-way catalytic converter, the oxygen concentration data being the oxygen concentration of the exhaust gas in the exhaust pipe of the three-way catalytic converter, and the oxygen concentration distribution being the distribution of the oxygen concentration data in the window; A first determination step is to determine whether the time proportion is greater than a second threshold, and whether the oxygen concentration distribution is less than a third threshold; In the second determination step, when the time proportion is greater than the second threshold and the oxygen concentration distribution is less than the third threshold, it is determined that ammonia leakage occurs in the three-way catalytic converter; when the time proportion is less than or equal to the second threshold, or the oxygen concentration distribution is greater than or equal to the third threshold, it is determined that ammonia leakage does not occur in the three-way catalytic converter.

2. The method according to claim 1, characterized in that The method further comprises: When it is determined that no ammonia leakage occurs in the three-way catalytic converter, the number of the windows where no ammonia leakage occurs is obtained, and the operating conditions of the vehicle corresponding to different windows are the same; When the number of the windows where no ammonia leakage occurs is greater than or equal to a fourth threshold, adjusting an air-fuel ratio setting value of the engine in the vehicle so that the adjusted air-fuel ratio setting value is greater than the air-fuel ratio setting value before adjustment, and acquiring the oxygen concentration data after the air-fuel ratio setting value is adjusted; At least whether ammonia slip occurs in the three-way catalyst is determined according to the magnitude relationship between the oxygen concentration data after the air-fuel ratio setting value is adjusted and the oxygen concentration data before the air-fuel ratio setting value is adjusted.

3. The method according to claim 2, characterized in that At least determining whether ammonia leakage occurs in the three-way catalyst according to the magnitude relationship between the oxygen concentration data after adjusting the air-fuel ratio setting value and the oxygen concentration data before adjusting the air-fuel ratio setting value includes: A third determination step, in a case where the oxygen concentration data after adjusting the air-fuel ratio setting value is less than the oxygen concentration data before adjusting the air-fuel ratio setting value, determining that ammonia leakage occurs in the three-way catalyst, and in a case where the oxygen concentration data after adjusting the air-fuel ratio setting value is greater than or equal to the oxygen concentration data before adjusting the air-fuel ratio setting value, determining that ammonia leakage does not occur in the three-way catalyst; an adjusting step of continuing to adjust the air-fuel ratio setting value, so that when it is determined that ammonia leakage occurs in the three-way catalyst, the current adjustment direction of the air-fuel ratio setting value is the same as the previous adjustment direction, and when it is determined that ammonia leakage does not occur in the three-way catalyst, the current adjustment direction is opposite to the previous adjustment direction; The first loop step is to loop and execute the third determining step and the adjusting step a predetermined number of times.

4. The method according to claim 2, characterized in that: When it is determined that no ammonia leakage occurs in the three-way catalyst, obtaining the number of the windows where no ammonia leakage occurs includes: A counting step, in which, when it is determined that no ammonia leakage occurs in the three-way catalytic converter, the count value is controlled to increase by 1; The second loop step is to loop through the acquisition step, the first determination step, the second determination step and the counting step to obtain the number of the windows where no ammonia leakage occurs.

5. The method according to claim 2, characterized in that: Adjusting an air-fuel ratio setting value of the engine in the vehicle includes: The fuel injector injection time of the vehicle is adjusted or the throttle opening of the vehicle is adjusted, thereby adjusting the air-fuel ratio setting value of the engine in the vehicle.

6. The method according to any one of claims 1 to 5, characterized in that Before the obtaining step, the method further includes: Acquire steady-state determination parameters, wherein the steady-state determination parameters include at least part of the following: the speed of the engine, the speed change rate, the intake air charge of the engine, the intake air charge change rate, the water temperature of the engine, the temperature of the three-way catalytic converter, the mass flow rate of the exhaust gas in the exhaust pipe, the working state of the nitrogen oxide sensor, and the working state of the vehicle; When the steady-state judgment parameter meets the preset conditions, it is determined that the vehicle is in the steady-state operating condition, and the preset conditions include at least part of the following: the speed is within a first preset range, the speed change rate is within a second preset range, the intake charge is within a third preset range, the intake charge change rate is within a fourth preset range, the water temperature is within a fifth preset range, the temperature is within a sixth preset range, the mass flow rate is within a seventh preset range, the nitrogen oxide sensor is in a normal working state, and the vehicle is in a normal working state.

7. A device for detecting ammonia leakage of a three-way catalytic converter, wherein the three-way catalytic converter is located in a vehicle, characterized in that: include: a first acquisition unit, configured to acquire, in a step of acquiring, when the vehicle is in a steady-state operating condition and the oxygen concentration data detected by the nitrogen oxide sensor is greater than a preset value, a time proportion in a window in which the oxygen concentration data is less than a first threshold value and an oxygen concentration distribution, wherein the window is a preset time period or a time period required for the engine to complete a preset work, the nitrogen oxide sensor is installed in the exhaust pipe of the three-way catalytic converter, the oxygen concentration data is the oxygen concentration of the exhaust gas in the exhaust pipe of the three-way catalytic converter, and the oxygen concentration distribution is the distribution of the oxygen concentration data in the window; A first determining unit, used in a first determining step, determines whether the time proportion is greater than a second threshold, and whether the oxygen concentration distribution is less than a third threshold; The second determination unit is used for the second determination step, to determine that ammonia leakage occurs in the three-way catalytic converter when the time proportion is greater than the second threshold and the oxygen concentration distribution is less than the third threshold; and to determine that ammonia leakage does not occur in the three-way catalytic converter when the time proportion is less than or equal to the second threshold, or the oxygen concentration distribution is greater than or equal to the third threshold.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute the method according to any one of claims 1 to 6.

9. A computer program product comprising computer instructions, characterized in that When the computer instructions are executed by a processor, the method according to any one of claims 1 to 6 is implemented.

10. An electronic device, characterized in that: include: One or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the one or more programs include methods for executing any one of claims 1 to 6.

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