A method, apparatus, and medium for monitoring nitrogen-oxygen sensor anomalies

Abstract

The application discloses a nitrogen oxygen sensor abnormality monitoring method and device and medium, relates to the field of sensors, solves the problem of power consumption waste caused by the need to collect a large amount of data for monitoring nitrogen oxygen sensor detection abnormality model, and obtains the engine speed, the engine fuel injection amount, the engine intake amount and the actual oxygen concentration of the nitrogen oxygen sensor. The current working condition state is judged according to the engine speed and the engine fuel injection amount. The oxygen concentration deviation under the current working condition is obtained according to the engine fuel injection amount, the engine intake amount and the actual oxygen concentration. Whether the oxygen concentration deviation is higher than the deviation threshold corresponding to the current working condition is judged. If yes, an abnormal nitrogen oxygen sensor prompt information is sent. The application judges the working condition state by acquiring the parameters in real time, determines the corresponding oxygen concentration deviation under the parameters, judges whether the nitrogen oxygen sensor is abnormal through the oxygen concentration deviation, and does not need to use a large amount of time for testing to calibrate the value of the model nitrogen oxide, thereby wasting energy consumption resources.

Description

Technical Field

[0001] This application relates to the field of sensors, and in particular to a method, apparatus and medium for abnormal monitoring of a nitrogen and oxygen sensor. Background Technology

[0002] The primary purpose of a nitrogen oxide (NOx) sensor is to quickly and accurately measure the concentration of nitrogen oxides (NOx) in gas. Heavy-duty diesel engines use the NOx value collected by the upstream NOx sensor to calculate the required urea solution for the reaction. The ammonia produced from the decomposition of urea is used as a reducing agent to convert the toxic NOx in the exhaust gas into non-toxic nitrogen and water through a selective catalytic reduction reaction. The NOx sensor plays a crucial role in the aftertreatment system. Abnormal NOx levels monitored by the NOx sensor directly affect the amount of urea injected into the SCR system, leading to excessive NOx levels at the end of the exhaust pipe.

[0003] Currently, there are various existing technologies for monitoring anomalies in nitrogen oxide sensors, such as comparing the deviation between the sensor's measured value and the model value by calibrating the NOx model value. However, this requires prior point scanning and calibration, collecting a large amount of calibration data to build the model, which consumes a lot of time and energy.

[0004] Therefore, how to solve the problem of power consumption waste caused by the large amount of data required to monitor the abnormal detection model of nitrogen and oxygen sensors is a technical problem that urgently needs to be solved by people in this field. Summary of the Invention

[0005] The purpose of this application is to provide a method, device, and medium for monitoring anomalies in a nitrogen and oxygen sensor, thereby solving the problem of power consumption waste caused by the need to collect a large amount of data to monitor the anomaly detection model of the nitrogen and oxygen sensor.

[0006] To address the aforementioned technical problems, this application provides a method for abnormal monitoring of a nitrogen and oxygen sensor, comprising:

[0007] Obtain engine speed, engine fuel injection quantity, engine intake air volume, and actual oxygen concentration from the nitrogen oxide sensor;

[0008] The current operating conditions are determined by the engine speed and the amount of fuel injected.

[0009] The oxygen concentration deviation under the current operating conditions is obtained based on the engine fuel injection quantity, engine air intake quantity, and actual oxygen concentration.

[0010] Determine whether the oxygen concentration deviation is higher than the deviation threshold corresponding to the current operating condition;

[0011] If so, a nitrogen and oxygen sensor malfunction warning message will be issued.

[0012] On the other hand, the above-mentioned nitrogen oxide sensor anomaly monitoring method determines the current operating condition by engine speed and engine fuel injection quantity, including:

[0013] Determine whether the engine speed and engine fuel injection quantity meet the low load operating condition threshold.

[0014] If so, then the current operating condition is determined to be a low-load operating condition;

[0015] Determine whether the engine speed and engine fuel injection quantity meet the threshold for reverse towing conditions and continue for more than a preset time;

[0016] If so, then the current working condition is determined to be a reverse drag working condition.

[0017] On the other hand, the above-mentioned nitrogen oxide sensor anomaly monitoring method obtains the oxygen concentration deviation under the current operating conditions based on the engine fuel injection quantity, engine intake air quantity, and actual oxygen concentration, including:

[0018] Obtain the theoretical oxygen concentration corresponding to the current operating condition;

[0019] The oxygen concentration deviation is obtained by comparing the theoretical oxygen concentration with the actual oxygen concentration.

[0020] On the other hand, in the above-mentioned nitrogen and oxygen sensor anomaly monitoring method, obtaining the theoretical oxygen concentration corresponding to the current operating condition includes:

[0021] If the current operating condition is a low-load condition, the theoretical oxygen concentration under the low-load condition can be obtained based on the engine fuel injection quantity and the engine intake air quantity.

[0022] If the current operating condition is reverse dragging, then obtain the pre-stored theoretical oxygen concentration under reverse dragging conditions.

[0023] On the other hand, the above-mentioned nitrogen-oxygen sensor anomaly monitoring method obtains the theoretical oxygen concentration under low-load conditions based on the engine fuel injection quantity and engine intake air quantity, including:

[0024] The theoretical oxygen concentration under low load conditions is obtained using the first formula.

[0025] The first formula is:

[0026]

[0027] Where O2Mdl is the theoretical oxygen concentration, and rlam is the excess air coefficient, which is obtained through the second formula;

[0028] The second formula is:

[0029]

[0030] Where Air represents the engine intake air volume and Inj represents the engine fuel injection volume.

[0031] On the other hand, in the above-mentioned nitrogen and oxygen sensor anomaly monitoring method, the oxygen concentration deviation is obtained based on the theoretical oxygen concentration and the actual oxygen concentration, including:

[0032] The average oxygen deviation was obtained according to the third formula;

[0033] The third formula is:

[0034]

[0035] in, O2Act is the average oxygen deviation, n is the total number of samplings, i represents the i-th sampling, and O2Mdl is the theoretical oxygen concentration corresponding to the current operating condition.

[0036] The average total oxygen content is obtained according to the fourth formula;

[0037] The fourth formula is:

[0038]

[0039] in, This represents the average value of the total oxygen content.

[0040] The relative deviation percentage of oxygen concentration is obtained based on the average oxygen deviation, the average total oxygen value, and the fifth formula.

[0041] The fifth formula is:

[0042]

[0043] Wherein, ΔDvtO2 is the percentage of relative deviation in oxygen concentration;

[0044] The percentage of relative deviation in oxygen concentration is taken as the oxygen concentration deviation.

[0045] On the other hand, the above-mentioned nitrogen and oxygen sensor anomaly monitoring method issues nitrogen and oxygen sensor anomaly warning information, including:

[0046] The abnormal nitrogen oxide sensor information is sent to the electronic control unit and the vehicle networking platform.

[0047] To address the aforementioned technical problems, this application also provides a nitrogen and oxygen sensor anomaly monitoring device, comprising:

[0048] The acquisition module is used to acquire engine speed, engine fuel injection quantity, engine intake air quantity, and the actual oxygen concentration of the nitrogen oxide sensor;

[0049] The operating condition determination module is used to determine the current operating condition based on engine speed and engine fuel injection quantity.

[0050] The deviation determination module is used to determine the oxygen concentration deviation under the current operating conditions based on the engine fuel injection quantity, engine air intake quantity, and actual oxygen concentration.

[0051] The anomaly detection module is used to determine whether the oxygen concentration deviation is higher than the deviation threshold corresponding to the current operating condition; if so, it triggers the anomaly alarm module.

[0052] The abnormal alarm module is used to issue abnormal warning messages for the nitrogen and oxygen sensor.

[0053] To address the aforementioned technical problems, this application also provides a nitrogen and oxygen sensor anomaly monitoring device, comprising:

[0054] Memory, used to store computer programs;

[0055] The processor is used to execute computer programs to implement the steps of the above-described nitrogen and oxygen sensor anomaly monitoring method.

[0056] To address the aforementioned technical problems, this application also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the above-described nitrogen and oxygen sensor anomaly monitoring method.

[0057] The nitrogen oxide sensor anomaly monitoring method provided in this application acquires engine speed, engine fuel injection quantity, engine intake air volume, and the actual oxygen concentration of the nitrogen oxide sensor; determines the current operating condition based on engine speed and engine fuel injection quantity; calculates the oxygen concentration deviation under the current operating condition based on engine fuel injection quantity, engine intake air volume, and actual oxygen concentration; determines whether the oxygen concentration deviation exceeds the deviation threshold corresponding to the current operating condition; if so, issues a nitrogen oxide sensor anomaly warning message. This application acquires operating parameters in real time, determines the operating condition, and identifies the corresponding oxygen concentration deviation under these parameters. It then uses the oxygen concentration deviation to determine whether the nitrogen oxide sensor is abnormal, eliminating the need for extensive pre-testing to calibrate the model's nitrogen oxide values, thus saving energy resources.

[0058] In addition, this application also provides an apparatus and a medium that correspond to the above method and have the same effect. Attached Figure Description

[0059] To more clearly illustrate the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0060] Figure 1 A flowchart illustrating an abnormal monitoring method for a nitrogen and oxygen sensor provided in this application embodiment;

[0061] Figure 2 This is a structural diagram of a nitrogen and oxygen sensor anomaly monitoring device provided in an embodiment of this application;

[0062] Figure 3 This is a structural diagram of another nitrogen and oxygen sensor anomaly monitoring device provided in an embodiment of this application. Detailed Implementation

[0063] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this application.

[0064] The core of this application is to provide a method, device, and medium for abnormal monitoring of a nitrogen and oxygen sensor.

[0065] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0066] Pollution from heavy-duty diesel engines primarily originates from three sources: particulate matter, hydrocarbons (HCx), nitrogen oxides (NOx), and sulfur. Nitrogen oxides are a mixture of nitrogen dioxide (NO2) and nitric oxide (NO) formed during combustion in the engine cylinders due to chemical reactions resulting from uneven fuel-air mixing. Nitrogen oxides, primarily composed of nitric oxide and nitrogen dioxide, are a significant contributor to photochemical smog and acid rain.

[0067] Heavy-duty diesel engines use the NOx value collected by an upstream nitrogen oxide sensor to calculate the required urea solution for the reaction. The ammonia produced from urea decomposition serves as a reducing agent, converting toxic nitrogen oxides in the exhaust gas into non-toxic nitrogen and water through a selective catalytic reduction reaction. The nitrogen oxide sensor plays a crucial role in the aftertreatment system. Abnormal nitrogen oxide levels monitored by the sensor directly affect the amount of urea injected into the SCR system, leading to excessive nitrogen oxide emissions at the end of the exhaust pipe.

[0068] Selective Catalytic Reduction (SCR) systems primarily utilize ammonia from urea decomposition as a reducing agent to convert toxic nitrogen oxides in exhaust gas into non-toxic nitrogen and water through a selective catalytic reduction reaction.

[0069] Aftertreatment system: An assembly of components that treat major pollutants such as nitrogen oxides and particulate matter in engine exhaust. This includes the diesel oxidation catalytic converter (DOC), diesel particulate filters (DPF), and the SCR system.

[0070] Electronic Control Unit (ECU), also known as "vehicle computer"

[0071] "Vehicle computer," in terms of its purpose, is a microcomputer controller specifically for vehicles. Like a regular computer, it consists of a microprocessor, memory, input / output interfaces, analog-to-digital converters, and large-scale integrated circuits such as drivers.

[0072] Currently, there are various existing technologies for monitoring nitrogen oxide sensors to detect anomalies. These methods compare the deviation between the sensor's measured values ​​and the model values ​​by calibrating nitrogen oxide model values. However, this requires prior point scanning and calibration, collecting a large amount of calibration data to build the model, which consumes a lot of time and energy.

[0073] To address the aforementioned problems, this application provides a method for anomaly monitoring of a nitrogen and oxygen sensor. Figure 1 A flowchart of a nitrogen and oxygen sensor anomaly monitoring method provided in this application embodiment is shown below. Figure 1 As shown, it includes:

[0074] S11: Obtain engine speed, engine fuel injection quantity, engine intake air quantity, and actual oxygen concentration from the nitrogen oxide sensor;

[0075] S12: Determine the current operating condition by measuring engine speed and engine fuel injection quantity;

[0076] S13: Calculate the oxygen concentration deviation under the current operating conditions based on the engine fuel injection quantity, engine air intake quantity, and actual oxygen concentration;

[0077] S14: Determine whether the oxygen concentration deviation is higher than the deviation threshold corresponding to the current operating condition;

[0078] S15: If so, issue a nitrogen and oxygen sensor malfunction warning message.

[0079] Given the principle by which nitrogen-oxygen sensors measure NOx signals, the accuracy of oxygen signal measurement can indirectly reflect the working status of the nitrogen-oxygen sensor. Therefore, monitoring oxygen concentration can be used to monitor the nitrogen-oxygen sensor.

[0080] Step S11 acquires engine speed, engine fuel injection quantity, engine intake air volume, and the actual oxygen concentration from the nitrogen oxide sensor, which can be obtained via a CAN bus (Controller Area Network). The CAN bus is a serial communication protocol widely used in the automotive and industrial fields. It is a highly reliable, real-time communication system used to connect various electronic control units (ECUs), such as engine control units, braking system control units, etc. Specifically, engine speed, engine fuel injection quantity, engine intake air volume, and the actual oxygen concentration from the nitrogen oxide sensor are acquired at preset acquisition intervals.

[0081] Step S12 determines the current operating condition by measuring engine speed and fuel injection quantity, such as low load condition, reverse driving condition, acceleration condition, and starting condition. The amount of nitrogen oxides produced and the reduction efficiency differ under different operating conditions; correspondingly, different thresholds can be set to determine whether an abnormality exists.

[0082] Step S13 obtains the oxygen concentration deviation under the current operating conditions based on the engine fuel injection quantity, engine air intake quantity, and actual oxygen concentration. This refers to the deviation between the theoretical oxygen concentration and the actual oxygen concentration under the current operating conditions. There is no specific limitation on this deviation. It can be the average deviation over a period of time, or it can be expressed in the form of variance, standard deviation, etc. The appropriate method can be selected according to actual needs.

[0083] Step S14 determines whether the oxygen concentration deviation is higher than the deviation threshold corresponding to the current operating condition. Different operating conditions correspond to different thresholds. If it is higher than the threshold, it indicates that the nitrogen-oxygen sensor is abnormal. If not, it indicates that the nitrogen-oxygen sensor is working normally.

[0084] The nitrogen oxide sensor anomaly monitoring method provided in this application acquires engine speed, engine fuel injection quantity, engine intake air volume, and the actual oxygen concentration of the nitrogen oxide sensor; determines the current operating condition based on engine speed and engine fuel injection quantity; obtains the oxygen concentration deviation under the current operating condition based on engine fuel injection quantity, engine intake air volume, and actual oxygen concentration; determines whether the oxygen concentration deviation is higher than the deviation threshold corresponding to the current operating condition; if so, issues a nitrogen oxide sensor anomaly warning message. This application acquires operating parameters in real time, determines the operating condition, and identifies the corresponding oxygen concentration deviation under these parameters. It then uses the oxygen concentration deviation to determine whether the nitrogen oxide sensor is abnormal, eliminating the need for extensive pre-testing to calibrate model nitrogen oxide values ​​and saving energy resources.

[0085] According to the above embodiments, in another embodiment, the above-described nitrogen oxide sensor anomaly monitoring method determines the current operating condition by engine speed and engine fuel injection quantity, including:

[0086] Determine whether the engine speed and engine fuel injection quantity meet the low load operating condition threshold.

[0087] If so, then the current operating condition is determined to be a low-load operating condition;

[0088] Determine whether the engine speed and engine fuel injection quantity meet the threshold for reverse towing conditions and continue for more than a preset time;

[0089] If so, then the current working condition is determined to be a reverse drag working condition.

[0090] Low-load operating conditions for a car engine refer to the state in which the engine bears a relatively light load during driving. This usually occurs in urban areas or on flat roads, when the vehicle speed is low and the accelerator pedal opening is small, the engine output power is less, and the load is lighter.

[0091] Driving backwards refers to a situation where a vehicle encounters significant resistance while driving, such as going downhill or coming to a stop. Due to inertia and external factors, the vehicle needs to expend additional energy to overcome this resistance. During driving backwards, the engine needs to provide more power to maintain vehicle operation and meet the extra demands.

[0092] Both of these operating conditions affect engine performance and fuel consumption. Under low load conditions, the engine speed is lower, resulting in incomplete fuel combustion and potentially reduced fuel efficiency. Under reverse towing conditions, the engine needs to provide more power, which may increase fuel consumption.

[0093] In this embodiment, it is necessary to determine the state of the nitrogen oxide sensor under these two operating conditions. For example, under low load conditions, the engine speed threshold range is set to 500-700 rpm, and the fuel injection threshold range is 5-25 mg / hub; under reverse towing conditions, the engine speed threshold range is greater than 700 rpm, the fuel injection threshold range is 0-2 mg / hub, and the duration exceeds 10 seconds.

[0094] According to the above embodiments, in another embodiment, the above-described nitrogen-oxygen sensor anomaly monitoring method, obtaining the oxygen concentration deviation under the current operating conditions based on the engine fuel injection quantity, engine air intake quantity, and actual oxygen concentration, includes:

[0095] Obtain the theoretical oxygen concentration corresponding to the current operating condition;

[0096] The oxygen concentration deviation is obtained by comparing the theoretical oxygen concentration with the actual oxygen concentration.

[0097] This embodiment mentions that the oxygen concentration can be preset or calculated based on the current operating status; this embodiment does not impose specific limitations. First, determine the theoretical oxygen concentration under the current operating conditions, and then calculate the deviation from the actual oxygen concentration. This deviation is not specifically limited; it can be the average deviation over a period of time, or it can be expressed in the form of variance, standard deviation, etc., depending on actual needs.

[0098] According to the above embodiments, in another embodiment, the above-described nitrogen and oxygen sensor anomaly monitoring method, obtaining the theoretical oxygen concentration corresponding to the current operating condition includes:

[0099] If the current operating condition is a low-load condition, the theoretical oxygen concentration under the low-load condition can be obtained based on the engine fuel injection quantity and the engine intake air quantity.

[0100] If the current operating condition is reverse dragging, then obtain the pre-stored theoretical oxygen concentration under reverse dragging conditions.

[0101] When the engine is running at low load, the oxygen concentration is less affected by engine consistency and minimally affected by the external environment, resulting in good accuracy for detection and reducing the judgment error to a certain range. Under reverse towing conditions, no fuel is injected, and the oxygen concentration in the exhaust is close to that in the air. In this case, the model value is also accurate, and the rationality of the sensor is judged more accurately.

[0102] In this embodiment, the theoretical oxygen concentration under low-load conditions is obtained based on the engine fuel injection quantity and engine intake air quantity; under reversing conditions, the pre-stored theoretical oxygen concentration under reversing conditions is obtained, as the oxygen concentration under reversing conditions is less affected by the engine and is close to the oxygen concentration in the air. For example, the theoretical oxygen concentration under reversing conditions is set to 0.209.

[0103] According to the above embodiments, in another embodiment, the above-mentioned nitrogen-oxygen sensor anomaly monitoring method, obtaining the theoretical oxygen concentration under low-load conditions based on the engine fuel injection quantity and engine intake air quantity, includes:

[0104] The theoretical oxygen concentration under low load conditions is obtained using the first formula.

[0105] The first formula is:

[0106]

[0107] Where O2Mdl is the theoretical oxygen concentration, and rlam is the excess air coefficient, which is obtained through the second formula;

[0108] The second formula is:

[0109]

[0110] Where Air represents the engine intake air volume and Inj represents the engine fuel injection volume.

[0111] The excess air coefficient refers to the ratio of fuel to the amount of oxygen required for theoretical complete combustion. It represents the actual amount of oxygen supplied relative to the theoretically required amount. Taking oxygen and fuel in the air as an example, a higher excess air coefficient indicates a more abundant supply of oxygen and more complete combustion. In this embodiment, the actual amount of oxygen and fuel supplied is obtained through the engine's intake air volume and fuel injection volume. The excess air coefficient is the ratio of the actual supplied oxygen to the theoretically required oxygen. In this embodiment, the theoretically required oxygen for the engine is preset to be the engine's fuel injection volume multiplied by a preset coefficient of 14.55. This coefficient can be set according to actual needs. It should be noted that the parameter 4.773 in the first formula and 14.55 in the second formula in this embodiment can be adjusted according to the actual operating environment and engine model.

[0112] According to the above embodiments, in another embodiment, the above-described nitrogen and oxygen sensor anomaly monitoring method, obtaining the oxygen concentration deviation based on the theoretical oxygen concentration and the actual oxygen concentration, includes:

[0113] The average oxygen deviation was obtained according to the third formula;

[0114] The third formula is:

[0115]

[0116] in, O2Act is the average oxygen deviation, n is the total number of samplings, i represents the i-th sampling, and O2Mdl is the theoretical oxygen concentration corresponding to the current operating condition.

[0117] The average total oxygen content is obtained according to the fourth formula;

[0118] The fourth formula is:

[0119]

[0120] in, This represents the average value of the total oxygen content.

[0121] The relative deviation percentage of oxygen concentration is obtained based on the average oxygen deviation, the average total oxygen value, and the fifth formula.

[0122] The fifth formula is:

[0123]

[0124] Wherein, ΔDvtO2 is the percentage of relative deviation in oxygen concentration;

[0125] The percentage of relative deviation in oxygen concentration is taken as the oxygen concentration deviation.

[0126] In this embodiment, O2Mdl i This represents the theoretical oxygen concentration under low-load or reverse-draft conditions. Under low-load conditions, the theoretical oxygen concentration for each sample is obtained according to the first formula; under reverse-draft conditions, the theoretical oxygen concentration for each sample is a preset value. O2Act represents the actual oxygen concentration obtained from each sample. The system calculates the average deviation between the actual and theoretical oxygen concentrations, and the sum of the actual and theoretical oxygen concentrations. Then, the average deviation is compared with the sum of the average values. If the deviation percentage ΔDvtO2 exceeds the range, the nitrogen-oxygen sensor is considered faulty. For example, the oxygen deviation threshold is set to 8% under low-load conditions and 5% under reverse-draft conditions. If the value is below the deviation threshold, the sensor is considered normal; if it is above the deviation threshold, the sensor is considered faulty.

[0127] According to the above embodiments, in another embodiment, the above-described nitrogen and oxygen sensor anomaly monitoring method includes issuing a nitrogen and oxygen sensor anomaly warning message, including:

[0128] The abnormal nitrogen oxide sensor information is sent to the electronic control unit and the vehicle networking platform.

[0129] Fault command information can be sent to the electronic control unit via CAN bus, reminding the driver to go to the service area for repair in time; at the same time, it is sent to the vehicle networking platform, which will then alert maintenance personnel to inform the driver to repair the nitrogen oxide sensor. Currently, the China VI emission standard for heavy-duty vehicles requires vehicles to be equipped with remote emission management on-board terminals. On-board terminals are widely used, and they can quickly detect and analyze whether the nitrogen oxide sensor is abnormal. This method is both universal and convenient. The connected vehicle platform is an intelligent automotive service platform based on internet technology, designed to achieve data interaction and communication between vehicles and between vehicles and the external environment by connecting vehicles and cloud systems.

[0130] The above embodiments have described the method for abnormal monitoring of nitrogen and oxygen sensors in detail. This application also provides embodiments corresponding to the nitrogen and oxygen sensor abnormal monitoring device. It should be noted that this application describes the embodiments of the device part from two perspectives: one is based on the functional modules, and the other is based on the hardware.

[0131] From the perspective of functional modules Figure 2 A structural diagram of a nitrogen and oxygen sensor anomaly monitoring device provided in this application embodiment is shown below. Figure 2 As shown, a nitrogen and oxygen sensor anomaly monitoring device includes:

[0132] The acquisition module 21 is used to acquire engine speed, engine fuel injection quantity, engine air intake quantity, and the actual oxygen concentration of the nitrogen-oxygen sensor;

[0133] Operating condition determination module 22 is used to determine the current operating condition by engine speed and engine fuel injection quantity;

[0134] Deviation determination module 23 is used to obtain the oxygen concentration deviation under the current operating conditions based on engine fuel injection quantity, engine air intake quantity, and actual oxygen concentration.

[0135] Anomaly detection module 24 is used to determine whether the oxygen concentration deviation is higher than the deviation threshold corresponding to the current operating condition; if so, it triggers anomaly alarm module 25.

[0136] The abnormal alarm module 25 is used to issue abnormal prompts for the nitrogen and oxygen sensor.

[0137] The nitrogen oxide sensor anomaly monitoring device provided in this application includes a module 21 for acquiring engine speed, engine fuel injection quantity, engine intake air volume, and the actual oxygen concentration of the nitrogen oxide sensor; a working condition judgment module 22 for determining the current working condition based on engine speed and engine fuel injection quantity; a deviation determination module 23 for obtaining the oxygen concentration deviation under the current working condition based on engine fuel injection quantity, engine intake air volume, and actual oxygen concentration; an anomaly judgment module 24 for determining whether the oxygen concentration deviation is higher than the deviation threshold corresponding to the current working condition; if so, triggering an anomaly alarm module 25; and an anomaly alarm module 25 for issuing a nitrogen oxide sensor anomaly warning message. This application, by acquiring operating parameters in real time, judges the working condition and determines the corresponding oxygen concentration deviation under these parameters, and uses the oxygen concentration deviation to determine whether the nitrogen oxide sensor is abnormal. This eliminates the need for extensive pre-testing to calibrate the model NOx value, thus avoiding wasted energy resources.

[0138] In addition, the operating condition judgment module 22 includes:

[0139] The first judgment unit is used to determine whether the engine speed and engine fuel injection quantity meet the low load operating condition threshold.

[0140] If so, then the current operating condition is determined to be a low-load operating condition;

[0141] The second judgment unit is used to determine whether the engine speed and engine fuel injection quantity meet the threshold of the reverse towing condition and continue for more than a preset time.

[0142] If so, then the current working condition is determined to be a reverse drag working condition.

[0143] Deviation determination module 23 includes:

[0144] Theoretical value acquisition unit is used to acquire the theoretical oxygen concentration corresponding to the current working condition;

[0145] The deviation calculation unit is used to obtain the oxygen concentration deviation based on the theoretical oxygen concentration and the actual oxygen concentration.

[0146] The theoretical value acquisition unit is also used to: if the current operating condition is a low-load condition, obtain the theoretical oxygen concentration under low-load conditions based on the engine fuel injection quantity and engine intake air quantity; specifically, it includes:

[0147] The theoretical oxygen concentration under low load conditions is obtained using the first formula.

[0148] The first formula is:

[0149]

[0150] Where O2Mdl is the theoretical oxygen concentration, and rlam is the excess air coefficient, which is obtained through the second formula;

[0151] The second formula is:

[0152]

[0153] Where Air represents the engine intake air volume and Inj represents the engine fuel injection volume.

[0154] The theoretical value acquisition unit is also used to: if the current working condition is a reverse drag working condition, acquire the pre-stored theoretical oxygen concentration under the reverse drag working condition.

[0155] The deviation calculation unit is specifically used to obtain the average oxygen deviation based on the third formula;

[0156] The third formula is:

[0157]

[0158] in, O2Act is the average oxygen deviation, n is the total number of samplings, i represents the i-th sampling, and O2Mdl is the theoretical oxygen concentration corresponding to the current operating condition.

[0159] The average total oxygen content is obtained according to the fourth formula;

[0160] The fourth formula is:

[0161]

[0162] in, This represents the average value of the total oxygen content.

[0163] The relative deviation percentage of oxygen concentration is obtained based on the average oxygen deviation, the average total oxygen value, and the fifth formula.

[0164] The fifth formula is:

[0165]

[0166] Wherein, ΔDvtO2 is the percentage of relative deviation in oxygen concentration;

[0167] The percentage of relative deviation in oxygen concentration is taken as the oxygen concentration deviation.

[0168] Since the embodiments of the apparatus and the embodiments of the method correspond to each other, please refer to the description of the embodiments of the method for the embodiments of the apparatus, which will not be repeated here.

[0169] Figure 3 A structural diagram of another nitrogen and oxygen sensor anomaly monitoring device provided in this application embodiment is shown below. Figure 3 As shown, the nitrogen and oxygen sensor abnormality monitoring device includes: a memory 30 for storing computer programs;

[0170] The processor 31 is used to execute a computer program to implement the steps of the method for obtaining user operation habit information as described in the above embodiment (nitrogen and oxygen sensor anomaly monitoring method).

[0171] The nitrogen and oxygen sensor anomaly monitoring device provided in this embodiment can include, but is not limited to, smartphones, tablets, laptops, or desktop computers.

[0172] The processor 31 may include one or more processing cores, such as a quad-core processor or an octa-core processor. The processor 31 may be implemented using at least one of the following hardware forms: Digital Signal Processor (DSP), Field-Programmable Gate Array (FPGA), or Programmable Logic Array (PLA). The processor 31 may also include a main processor and a coprocessor. The main processor, also known as the Central Processing Unit (CPU), is used to process data in the wake-up state; the coprocessor is a low-power processor used to process data in the standby state. In some embodiments, the processor 31 may integrate a Graphics Processing Unit (GPU), which is responsible for rendering and drawing the content to be displayed on the screen. In some embodiments, the processor 31 may also include an Artificial Intelligence (AI) processor, which handles computational operations related to machine learning.

[0173] The memory 30 may include one or more computer-readable storage media, which may be non-transitory. The memory 30 may also include high-speed random access memory and non-volatile memory, such as one or more disk storage devices or flash memory devices. In this embodiment, the memory 30 is used to store at least the following computer program 301, which, after being loaded and executed by the processor 31, is capable of implementing the relevant steps of the nitrogen and oxygen sensor anomaly monitoring method disclosed in any of the foregoing embodiments. In addition, the resources stored in the memory 30 may also include an operating system 302 and data 303, and the storage method may be temporary or permanent storage. The operating system 302 may include Windows, Unix, Linux, etc. The data 303 may include, but is not limited to, the data involved in implementing the nitrogen and oxygen sensor anomaly monitoring method.

[0174] In some embodiments, the nitrogen and oxygen sensor abnormality monitoring device may further include a display screen 32, an input / output interface 33, a communication interface 34, a power supply 35, and a communication bus 36.

[0175] Those skilled in the art will understand that Figure 3 The structure shown does not constitute a limitation on the nitrogen and oxygen sensor anomaly monitoring device and may include more or fewer components than shown.

[0176] The nitrogen oxide sensor anomaly monitoring device provided in this application includes a memory and a processor. When the processor executes the program stored in the memory, it can implement the following method: a nitrogen oxide sensor anomaly monitoring method, which acquires engine speed, engine fuel injection quantity, engine intake air quantity, and the actual oxygen concentration of the nitrogen oxide sensor; determines the current operating condition based on engine speed and engine fuel injection quantity; obtains the oxygen concentration deviation under the current operating condition based on engine fuel injection quantity, engine intake air quantity, and actual oxygen concentration; determines whether the oxygen concentration deviation is higher than the deviation threshold corresponding to the current operating condition; if so, issues a nitrogen oxide sensor anomaly warning message. This application acquires operating parameters in real time, determines the operating condition, and determines the corresponding oxygen concentration deviation under these parameters. It then uses the oxygen concentration deviation to determine whether the nitrogen oxide sensor is abnormal, eliminating the need for extensive pre-testing to calibrate the model NOx value and saving energy resources.

[0177] Finally, this application also provides an embodiment corresponding to a computer-readable storage medium. The computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps described in the above embodiment of the nitrogen and oxygen sensor anomaly monitoring method.

[0178] It is understood that if the methods in the above embodiments are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and executes all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0179] The computer-readable storage medium provided in this embodiment stores a computer program. When the processor executes the program, it can implement the following method: a nitrogen oxide sensor anomaly monitoring method, which acquires engine speed, engine fuel injection quantity, engine intake air volume, and the actual oxygen concentration of the nitrogen oxide sensor; determines the current operating condition based on engine speed and engine fuel injection quantity; obtains the oxygen concentration deviation under the current operating condition based on engine fuel injection quantity, engine intake air volume, and actual oxygen concentration; determines whether the oxygen concentration deviation is higher than the deviation threshold corresponding to the current operating condition; if so, issues a nitrogen oxide sensor anomaly warning message. This application acquires operating parameters in real time, determines the operating condition, and determines the corresponding oxygen concentration deviation under these parameters. It then uses the oxygen concentration deviation to determine whether the nitrogen oxide sensor is abnormal, eliminating the need for extensive pre-testing to calibrate the model NOx value and saving energy resources.

[0180] The above provides a detailed description of the nitrogen and oxygen sensor anomaly monitoring method, apparatus, and medium provided in this application. The various embodiments in the specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

[0181] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A method of monitoring for an abnormality in a nitrogen oxide sensor, characterized by, include: Obtain engine speed, engine fuel injection quantity, engine intake air volume, and actual oxygen concentration from the nitrogen oxide sensor; The current operating condition is determined by the engine speed and the engine fuel injection quantity; The oxygen concentration deviation under the current operating conditions is obtained based on the engine fuel injection quantity, the engine air intake quantity, and the actual oxygen concentration. Determine whether the oxygen concentration deviation is higher than the deviation threshold corresponding to the current operating condition; If so, issue an abnormality warning message for the nitrogen and oxygen sensor; The step of determining the current operating condition by the engine speed and the engine fuel injection quantity includes: Determine whether the engine speed and the engine fuel injection quantity meet the low load operating condition threshold. If so, then the current operating condition is determined to be a low-load operating condition; Determine whether the engine speed and the engine fuel injection quantity meet the threshold for reverse towing conditions and continue for more than a preset time; If so, then the current working condition is determined to be a reverse drag working condition; The step of obtaining the oxygen concentration deviation under the current operating conditions based on the engine fuel injection quantity, the engine air intake quantity, and the actual oxygen concentration includes: Obtain the theoretical oxygen concentration corresponding to the current operating condition; The oxygen concentration deviation is obtained based on the theoretical oxygen concentration and the actual oxygen concentration. The step of obtaining the theoretical oxygen concentration corresponding to the current operating condition includes: If the current operating condition is a low-load condition, the theoretical oxygen concentration under the low-load condition is obtained based on the engine fuel injection quantity and the engine air intake quantity. If the current operating condition is reverse dragging, then obtain the theoretical oxygen concentration under the pre-stored reverse dragging condition.

2. The nitrogen oxide sensor abnormality monitoring method according to claim 1, characterized by, The step of obtaining the theoretical oxygen concentration under low-load conditions based on the engine fuel injection quantity and the engine intake air quantity includes: The theoretical oxygen concentration under the low-load condition is obtained using the first formula. The first formula is: in, The theoretical oxygen concentration is... The excess air coefficient is obtained through a second formula. The second formula is: in, This refers to the engine's air intake volume. This refers to the amount of fuel injected into the engine.

3. The nitrogen and oxygen sensor anomaly monitoring method according to claim 2, characterized in that, The process of obtaining the oxygen concentration deviation based on the theoretical oxygen concentration and the actual oxygen concentration includes: The average oxygen deviation was obtained according to the third formula; The third formula is: in, This represents the average deviation of the oxygen deviation. The actual oxygen concentration is... n This represents the total number of samples. i Indicates the first i Second sampling, O 2 Mdl This refers to the theoretical oxygen concentration corresponding to the current operating conditions. The average total oxygen content is obtained according to the fourth formula; The fourth formula is: in, This represents the average value of the total oxygen content; The relative deviation percentage of oxygen concentration is obtained based on the average oxygen deviation, the average total oxygen value, and the fifth formula. The fifth formula is: in, The percentage of the relative deviation of the oxygen concentration; The percentage of the relative deviation of the oxygen concentration is taken as the oxygen concentration deviation.

4. The nitrogen and oxygen sensor anomaly monitoring method according to any one of claims 1 to 3, characterized in that, The abnormal nitrogen and oxygen sensor warning message includes: The abnormal nitrogen oxide sensor information is sent to the electronic control unit and the vehicle networking platform.

5. A nitrogen and oxygen sensor anomaly monitoring device, characterized in that, include: The acquisition module is used to acquire engine speed, engine fuel injection quantity, engine intake air quantity, and the actual oxygen concentration of the nitrogen oxide sensor; The operating condition determination module is used to determine the current operating condition based on the engine speed and the engine fuel injection quantity. The deviation determination module is used to obtain the oxygen concentration deviation under the current operating conditions based on the engine fuel injection quantity, the engine air intake quantity, and the actual oxygen concentration. An anomaly detection module is used to determine whether the oxygen concentration deviation is higher than the deviation threshold corresponding to the current operating condition; if so, it triggers the anomaly alarm module. The abnormal alarm module is used to issue abnormal prompts for the nitrogen and oxygen sensor; The step of determining the current operating condition by the engine speed and the engine fuel injection quantity includes: Determine whether the engine speed and the engine fuel injection quantity meet the low load operating condition threshold. If so, then the current operating condition is determined to be a low-load operating condition; Determine whether the engine speed and the engine fuel injection quantity meet the threshold for reverse towing conditions and continue for more than a preset time; If so, then the current working condition is determined to be a reverse drag working condition; The step of obtaining the oxygen concentration deviation under the current operating conditions based on the engine fuel injection quantity, the engine air intake quantity, and the actual oxygen concentration includes: Obtain the theoretical oxygen concentration corresponding to the current operating condition; The oxygen concentration deviation is obtained based on the theoretical oxygen concentration and the actual oxygen concentration. The step of obtaining the theoretical oxygen concentration corresponding to the current operating condition includes: If the current operating condition is a low-load condition, the theoretical oxygen concentration under the low-load condition is obtained based on the engine fuel injection quantity and the engine air intake quantity. If the current operating condition is reverse dragging, then obtain the theoretical oxygen concentration under the pre-stored reverse dragging condition.

6. A nitrogen and oxygen sensor anomaly monitoring device, characterized in that, include: Memory, used to store computer programs; A processor, configured to execute the computer program to implement the steps of the nitrogen and oxygen sensor anomaly monitoring method as described in any one of claims 1 to 4.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the steps of the nitrogen and oxygen sensor anomaly monitoring method as described in any one of claims 1 to 4.

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