A Method, Device, Medium and Equipment for Diagnosing the Conversion Efficiency of a Three-Way Catalytic Converter

Abstract

The present application provides a method, device, medium and equipment for diagnosing the conversion efficiency of a three-way catalytic converter, which determines the operating state of a target vehicle; if the operating state is a coasting state, calculates a coasting cumulative parameter; if the coasting cumulative parameter meets a preset condition, calculates the circulating oxygen storage amount from the first time when the target vehicle exits the coasting state to the second time when oxygen release is completed, so as to determine the conversion efficiency of the three-way catalytic converter of the target vehicle; that is, during the operation of the target vehicle, its operating state is determined according to its operating state parameters. If the target vehicle is in a coasting state, the coasting cumulative parameter is calculated, and after the preset condition is met, the circulating oxygen storage amount is calculated to determine the conversion efficiency of the three-way catalytic converter of the target vehicle, so that the oxygen storage amount of the target vehicle in an oxygen storage to oxygen release cycle can be accurately calculated, and then the conversion efficiency of the three-way catalytic converter can be accurately calculated, so as to more accurately evaluate the degree of degradation of the three-way catalytic converter of the target vehicle.

Description

Technical Field

[0001] The present application relates to the technical field of three-way catalytic converter conversion efficiency monitoring, and in particular to a three-way catalytic converter conversion efficiency diagnosis method, device, medium and equipment. Background Art

[0002] The three-way catalytic converter is the most important external purification device installed in the automobile exhaust system. The three-way catalytic converter can remove CO, HC and NO in the exhaust gas of the automobile. X Harmful gases such as carbon monoxide and other pollutants are converted into harmless carbon dioxide, water and nitrogen through oxidation and reduction. If the three-way catalyst fails or its conversion efficiency is reduced, it will have a great impact on the vehicle's emission performance.

[0003] Currently, the conversion efficiency of three-way catalytic converters is often determined by calculating oxygen storage capacity. However, these calculations are often incomplete, leading to inaccurate calculations in practice and, consequently, inaccurate diagnosis of three-way catalytic converter failures. Therefore, a solution is needed to accurately estimate the conversion efficiency of three-way catalytic converters. Summary of the Invention

[0004] In order to solve the above technical problems, the present application is proposed. The embodiments of the present application provide a method, device, medium and equipment for diagnosing the conversion efficiency of a three-way catalytic converter.

[0005] According to one aspect of the present application, a method for diagnosing the conversion efficiency of a three-way catalytic converter is provided, comprising: obtaining operating state parameters of a target vehicle; determining the operating state of the target vehicle based on the operating state parameters; if the operating state of the target vehicle is a coasting state, calculating a coasting cumulative parameter of the target vehicle; wherein the coasting cumulative parameter represents the cumulative value of characteristic parameters of the target vehicle in the coasting state; if the coasting cumulative parameter meets a preset condition, calculating a circulating oxygen storage amount from a first time when the target vehicle exits the coasting state to a second time when the three-way catalytic converter completes oxygen release; and determining the conversion efficiency of the three-way catalytic converter of the target vehicle based on the circulating oxygen storage amount.

[0006] In one embodiment, the operating status parameters include the vehicle speed and engine speed of the target vehicle; wherein, determining the operating status of the target vehicle based on the operating status parameters includes: if the vehicle speed is zero or continuously decreasing, and the engine speed is greater than or equal to the idle speed, then determining that the operating status of the target vehicle is a coasting state.

[0007] In one embodiment, the calculating of the cumulative coasting parameter of the target vehicle includes calculating a coasting time duration and a maximum value of an excess air coefficient of the target vehicle in the coasting state.

[0008] In one embodiment, if the coasting cumulative parameter meets a preset condition, calculating the circulating oxygen storage amount from the first time when the target vehicle exits the coasting state to the second time when the three-way catalytic converter completes oxygen release includes: if the coasting duration is greater than a preset duration threshold and the maximum value of the excess air coefficient is greater than a preset value, calculating the circulating oxygen storage amount.

[0009] In one embodiment, the calculating of the circulating oxygen storage amount during a first time when the target vehicle exits the coasting state to a second time when the three-way catalytic converter completes oxygen release includes: calculating the circulating oxygen storage amount based on the excess air coefficient and the engine intake flow of the target vehicle during a first time to a second time.

[0010] In one embodiment, the calculating of the circulating oxygen storage capacity based on the excess air coefficient and the engine intake flow rate of the target vehicle from the first time to the second time includes: the calculation formula of the circulating oxygen storage capacity is: ;in, OSC is the circulating oxygen storage capacity of the target vehicle, λ is the excess air coefficient measured by the upstream oxygen sensor, Q is the intake air flow of the engine, t 1 is the first time when the target vehicle exits the coasting condition, t 2 is the second time when the three-way catalytic converter completes oxygen release.

[0011] In one embodiment, determining the conversion efficiency of the three-way catalytic converter of the target vehicle based on the circulating oxygen storage amount includes: determining the conversion efficiency of the three-way catalytic converter of the target vehicle based on the circulating oxygen storage amount and the maximum oxygen storage amount of the target vehicle.

[0012] According to another aspect of the present application, a conversion efficiency diagnostic device for a three-way catalytic converter is provided, comprising: an operating parameter acquisition module for acquiring operating status parameters of a target vehicle; an operating status determination module for determining the operating status of the target vehicle based on the operating status parameters; a glide parameter calculation module for calculating a glide cumulative parameter of the target vehicle if the operating status of the target vehicle is a glide state; wherein the glide cumulative parameter represents the cumulative value of characteristic parameters of the target vehicle in the glide state; an oxygen storage quantity calculation module for calculating a circulating oxygen storage quantity from a first time when the target vehicle exits the glide state to a second time when the three-way catalytic converter completes oxygen release if the glide cumulative parameter meets a preset condition; and a conversion efficiency determination module for determining the conversion efficiency of the three-way catalytic converter of the target vehicle based on the circulating oxygen storage quantity.

[0013] According to another aspect of the present application, a computer-readable storage medium is provided, wherein the storage medium stores a computer program, and the computer program is used to execute any of the above methods.

[0014] According to another aspect of the present application, an electronic device is provided, comprising: a processor; a memory for storing instructions executable by the processor; and the processor for executing any of the above methods.

[0015] The present application provides a method, apparatus, medium, and device for diagnosing the conversion efficiency of a three-way catalytic converter. The method comprises obtaining operating state parameters of a target vehicle; determining the operating state of the target vehicle based on the operating state parameters; and calculating a coasting cumulative parameter of the target vehicle if the operating state of the target vehicle is coasting. The coasting cumulative parameter represents the cumulative value of characteristic parameters of the target vehicle in the coasting state. If the coasting cumulative parameter satisfies a preset condition, the circulating oxygen storage amount from a first time when the target vehicle exits the coasting state to a second time when the three-way catalytic converter completes oxygen release is calculated. The conversion efficiency of the three-way catalytic converter of the target vehicle is determined based on the circulating oxygen storage amount. That is, the operating state of the target vehicle is determined based on its operating state parameters during operation. If the target vehicle is in the coasting state, the coasting cumulative parameter is calculated. After the preset condition is met, the circulating oxygen storage amount is calculated to determine the conversion efficiency of the three-way catalytic converter of the target vehicle. Thus, the oxygen storage amount of the target vehicle during an oxygen storage to oxygen release cycle can be accurately calculated, and then the conversion efficiency of the three-way catalytic converter can be accurately calculated, so as to more accurately evaluate the three-way catalytic converter of the target vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and other purposes, features, and advantages of the present application will become more apparent through a more detailed description of the embodiments of the present application in conjunction with the accompanying drawings. The accompanying drawings are intended to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the drawings, the same reference numerals generally represent the same components or steps.

[0017] Figure 1 It is a flow chart of a method for diagnosing conversion efficiency of a three-way catalytic converter provided by an exemplary embodiment of the present application.

[0018] Figure 2 1 is a schematic diagram of an example structure of a method for diagnosing conversion efficiency of a three-way catalytic converter provided by an exemplary embodiment of the present application.

[0019] Figure 3 It is a schematic structural diagram of a conversion efficiency diagnostic device for a three-way catalytic converter provided by an exemplary embodiment of the present application.

[0020] Figure 4It is a structural diagram of an electronic device provided by an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0021] Below, the exemplary embodiments according to the present application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application, and it should be understood that the present application is not limited to the exemplary embodiments described herein.

[0022] Figure 1 FIG. 1 is a flow chart of a method for diagnosing the conversion efficiency of a three-way catalytic converter provided by an exemplary embodiment of the present application. Figure 1 As shown, the conversion efficiency diagnosis method of the three-way catalytic converter includes the following steps:

[0023] Step 110: Obtain the operating status parameters of the target vehicle.

[0024] This application uses a remote platform to obtain real-time operating status parameters of a target vehicle, including relevant data collected by sensors mounted on the target vehicle, such as vehicle speed, engine speed, engine intake volume, engine fuel flow, and output values of oxygen sensors upstream and downstream of the three-way catalytic converter. Among them, the oxygen sensor is an important component of the three-way catalytic converter system and is generally arranged one upstream and one downstream of the three-way catalytic converter. There are two commonly used types of oxygen sensors: wide-band oxygen sensors and switch-type oxygen sensors, which have different output characteristic curves. The wide-band oxygen sensor is generally installed upstream of the three-way catalytic converter to monitor the oxygen content of the exhaust gas before it enters the three-way catalytic converter and output an excess air coefficient value, which is mainly used for equivalence ratio combustion control. The switch-type oxygen sensor is installed downstream of the three-way catalytic converter to monitor the oxygen content in the exhaust gas after it has been processed by the three-way catalytic converter and output a voltage signal. When the oxygen content in the exhaust gas is near the equivalence ratio, the voltage output signal jumps and is mainly used to assist in calculating the oxygen storage capacity of the three-way catalytic converter.

[0025] Step 120: Determine the operating state of the target vehicle based on the operating state parameter.

[0026] After obtaining the operating status parameters of the target vehicle, the present application determines the operating status of the target vehicle based on the real-time operating status parameters of the target vehicle, that is, determines the current operating status of the target vehicle according to the operating status parameters of the target vehicle, such as driving status, gliding status, etc.

[0027] Step 130: If the target vehicle is in a coasting state, calculate the coasting cumulative parameter of the target vehicle.

[0028] The coasting cumulative parameter represents the cumulative value of the target vehicle's characteristic parameters while coasting. When the target vehicle is determined to be in a coasting state (where the engine speed and fuel flow are low), the present application calculates the target vehicle's coasting cumulative parameter during this coasting state to determine the target vehicle's oxygen storage during this coasting state (because the target vehicle's intake volume exceeds the fuel injection volume during the coasting state, resulting in a high air-fuel ratio in the exhaust gas, the three-way catalytic converter is currently in the process of storing oxygen).

[0029] Step 140: If the coasting cumulative parameter satisfies the preset condition, the circulating oxygen storage amount during the first time when the target vehicle exits the coasting state to the second time when the three-way catalytic converter completes oxygen release is calculated.

[0030] If the target vehicle meets the preset conditions during this coasting (i.e. oxygen storage is completed), the target vehicle's circulating oxygen storage capacity from the first time it exits the coasting state (engine resumes fuel supply) to the second time it completes oxygen release (e.g. Figure 2 As shown in the figure, the oxygen release amount of the target vehicle from the completion of oxygen storage to the completion of oxygen release (i.e. the maximum oxygen storage amount that the three-way catalytic converter can reach) is calculated to determine the conversion efficiency of the three-way catalytic converter.

[0031] Step 150: Determine the conversion efficiency of the three-way catalytic converter of the target vehicle based on the circulating oxygen storage amount.

[0032] Since the conversion amount of the three-way catalytic converter is positively correlated with the amount of oxygen it can store, using the oxygen storage amount as an indicator to measure the conversion efficiency of the three-way catalytic converter can accurately reflect the conversion efficiency of the three-way catalytic converter. After calculating the amount of oxygen released from the target vehicle to complete the process from oxygen storage to oxygen release, the application diagnoses the conversion efficiency of the three-way catalytic converter of the target vehicle based on the oxygen release amount to ensure the accuracy of the diagnosis.

[0033] The present application provides a method for diagnosing the conversion efficiency of a three-way catalytic converter, which obtains the operating state parameters of a target vehicle; determines the operating state of the target vehicle based on the operating state parameters; if the operating state of the target vehicle is a coasting state, calculates the coasting cumulative parameter of the target vehicle; wherein the coasting cumulative parameter represents the cumulative value of the characteristic parameters of the target vehicle in the coasting state; if the coasting cumulative parameter meets the preset conditions, calculates the circulating oxygen storage amount from the first time when the target vehicle exits the coasting state to the second time when the three-way catalytic converter completes oxygen release; determines the conversion efficiency of the three-way catalytic converter of the target vehicle based on the circulating oxygen storage amount; that is, when the target vehicle exits the coasting state, the conversion efficiency of the three-way catalytic converter of the target vehicle is determined; that is, when the target vehicle exits the coasting state, the conversion efficiency of the three-way catalytic converter of the target vehicle is determined; During operation, its operating state is determined according to its operating state parameters. If the target vehicle is in a coasting state, the coasting cumulative parameters are calculated, and after the preset conditions are met, the circulating oxygen storage capacity is calculated to determine the conversion efficiency of the three-way catalytic converter of the target vehicle. In this way, the oxygen storage capacity of the target vehicle in an oxygen storage to oxygen release cycle can be accurately calculated, and then the conversion efficiency of the three-way catalytic converter can be accurately calculated to more accurately evaluate the three-way catalytic converter of the target vehicle. Remote monitoring can also be used to realize remote emission monitoring of vehicles (especially heavy-duty vehicles) to achieve remote real-time identification of vehicles with excessive emissions, thereby improving the intensity and effectiveness of environmental protection supervision.

[0034] In one embodiment, the operating status parameters include the vehicle speed and engine speed of the target vehicle; wherein, the specific implementation method of the above step 120 can be: if the vehicle speed is zero or continuously decreasing, and the engine speed is greater than or equal to the idle speed, then the operating status of the target vehicle is determined to be a gliding state.

[0035] The present application determines whether the target vehicle is in a coasting state by the vehicle speed and engine speed of the target vehicle. When the vehicle speed is zero (i.e., parking idle) or continuously decreasing (the vehicle speed is in a decreasing state, i.e., free coasting or brake coasting), and the engine speed is greater than or equal to the idle speed (and the difference between the engine speed and the idle speed is less than the preset speed difference), it can be determined that the target vehicle is in a coasting state (e.g., Figure 2 As shown in Figure 2), the target vehicle is in the oxygen storage process.

[0036] In one embodiment, the specific implementation of the above step 130 may be: calculating the coasting time of the target vehicle in the coasting state and the maximum value of the excess air coefficient.

[0037] When it is determined that the target vehicle is in the process of oxygen storage, the cumulative parameters of the target vehicle in the oxygen storage process are judged to determine whether the oxygen storage of the target vehicle is completed. Specifically, the present application calculates the gliding time (duration of the oxygen storage process) and the maximum value of the excess air coefficient (or the cumulative value, which increases with the continuous increase in the oxygen storage amount) of the target vehicle in the gliding state, and determines whether the oxygen storage process of the target vehicle is completed based on the gliding time and the maximum value of the excess air coefficient.

[0038] In one embodiment, the specific implementation of the above step 140 may be: if the coasting time is greater than a preset time threshold and the maximum value of the excess air coefficient is greater than a preset value, then calculating the circulating oxygen storage capacity.

[0039] If the coasting time is greater than the preset time threshold and the maximum value of the excess air coefficient is greater than the preset value, for example, the coasting time is greater than 60 seconds and the maximum value of the excess air coefficient is greater than 1.05, that is, (the maximum value of the excess air coefficient - 1) > 0.05, then it is determined that the oxygen storage process of the target vehicle is completed. At this time, the oxygen storage capacity of the target vehicle (that is, the amount of oxygen released after the oxygen storage is completed) can be calculated.

[0040] Optionally, if the target vehicle does not exist in a gliding state that meets the preset conditions during this driving process, a fixed time frame can be used to move on the target vehicle's operating state parameter curve (such as the vehicle speed curve) to intercept multiple curve segments, and the proportion of the gliding state in each curve segment is calculated. If there is a curve with a proportion greater than a preset proportion threshold, it means that the target vehicle has basically completed oxygen storage within the time period. The curve corresponding to the maximum proportion is selected as the target curve, and the end point of the gliding state curve at the end of the target curve is used as the above-mentioned first time to calculate the conversion efficiency of the three-way catalytic converter during this driving process of the target vehicle.

[0041] In one embodiment, a specific implementation of the above step 140 may be: calculating the circulating oxygen storage capacity based on the excess air coefficient and the engine intake flow of the target vehicle from the first time to the second time.

[0042] After determining that the target vehicle has completed oxygen storage, the time when the target vehicle exits the coasting state and enters the driving state (that is, the engine resumes fuel supply) is recorded as the first time, and the time when the three-way catalytic converter completes oxygen release is recorded as the second time (specifically, it can be determined by the output value of the oxygen sensor downstream of the three-way catalytic converter. When the output value of the oxygen sensor downstream of the three-way catalytic converter jumps from a low voltage signal to a high voltage signal, the three-way catalytic converter completes oxygen release). This application calculates the circulating oxygen storage capacity through the excess air coefficient and engine intake flow of the target vehicle from the first time to the second time.

[0043] In one embodiment, the specific implementation of the above step 140 may be: the calculation formula of the circulating oxygen storage capacity is: ;in, OSC is the circulating oxygen storage capacity of the target vehicle, λ is the excess air coefficient measured by the upstream oxygen sensor, Q is the intake air flow of the engine, t 1 is the first time when the target vehicle exits the coasting condition, t 2 is the second time when the three-way catalytic converter completes oxygen release.

[0044] The present application calculates the integral of the intake air flow and excess air coefficient of the engine during the entire oxygen release process of the target vehicle with respect to time to determine the actual amount of oxygen released during the oxygen release process, that is, to determine the oxygen storage capacity of the three-way catalytic converter of the target vehicle (such as Figure 2 shown).

[0045] In one embodiment, a specific implementation of the above step 150 may be: determining the conversion efficiency of the three-way catalytic converter of the target vehicle based on the circulating oxygen storage capacity and the maximum oxygen storage capacity of the target vehicle.

[0046] After calculating the target vehicle's circulating oxygen storage capacity, combined with the target vehicle's new three-way catalytic converter's maximum oxygen storage capacity OSC max (can be measured and calibrated in advance), if the target vehicle's three-way catalytic converter's circulating oxygen storage capacity OSC <kOSC max , it is determined that the conversion efficiency of the three-way catalytic converter of the target vehicle is low and the target vehicle has an over-emission risk. Otherwise, it is determined that the conversion efficiency of the three-way catalytic converter of the target vehicle is high and the target vehicle does not have an over-emission risk. k The value range is 0~1, for example k =0.5.

[0047] Figure 3 Schematic diagram of the structure of a three-way catalytic converter conversion efficiency diagnostic device provided by an exemplary embodiment of the present application. Figure 3 As shown, the conversion efficiency diagnostic device 30 of the three-way catalytic converter includes: an operating parameter acquisition module 31, which is used to obtain the operating status parameters of the target vehicle; an operating status determination module 32, which is used to determine the operating status of the target vehicle based on the operating status parameters; a coasting parameter calculation module 33, which is used to calculate the coasting cumulative parameter of the target vehicle if the operating status of the target vehicle is the coasting state; wherein the coasting cumulative parameter represents the cumulative value of the characteristic parameter of the target vehicle in the coasting state; an oxygen storage amount calculation module 34, which is used to calculate the circulating oxygen storage amount from the first time when the target vehicle exits the coasting state to the second time when the three-way catalytic converter completes oxygen release if the coasting cumulative parameter meets the preset conditions; and a conversion efficiency determination module 35, which is used to determine the conversion efficiency of the three-way catalytic converter of the target vehicle based on the circulating oxygen storage amount.

[0048] The present application provides a three-way catalytic converter conversion efficiency diagnostic device, which obtains the operating state parameters of the target vehicle through the operating parameter acquisition module 31; the operating state determination module 32 determines the operating state of the target vehicle based on the operating state parameters; if the operating state of the target vehicle is the coasting state, the coasting parameter calculation module 33 calculates the coasting cumulative parameter of the target vehicle; wherein the coasting cumulative parameter represents the cumulative value of the characteristic parameter of the target vehicle in the coasting state; if the coasting cumulative parameter meets the preset conditions, the oxygen storage calculation module 34 calculates the time from the first time the target vehicle exits the coasting state to the time when the three-way catalytic converter completes oxygen release the circulating oxygen storage amount within the second time; the conversion efficiency determination module 35 determines the conversion efficiency of the three-way catalytic converter of the target vehicle based on the circulating oxygen storage amount; that is, during the operation of the target vehicle, its operating state is determined according to its operating state parameters. If the target vehicle is in a coasting state, the coasting cumulative parameter is calculated, and the circulating oxygen storage amount is calculated after the preset conditions are met to determine the conversion efficiency of the three-way catalytic converter of the target vehicle, so that the oxygen storage amount of the target vehicle in an oxygen storage to oxygen release cycle can be accurately calculated, and then the conversion efficiency of the three-way catalytic converter can be accurately calculated, so as to more accurately evaluate the three-way catalytic converter of the target vehicle.

[0049] In one embodiment, the operating state parameters include the vehicle speed and engine speed of the target vehicle; wherein, the above-mentioned operating state determination module 32 can be further configured as: if the vehicle speed is zero or continuously decreasing, and the engine speed is greater than or equal to the idle speed, then the operating state of the target vehicle is determined to be a coasting state.

[0050] In one embodiment, the coasting parameter calculation module 33 may be further configured to calculate the coasting duration and the maximum value of the excess air coefficient of the target vehicle in the coasting state.

[0051] In one embodiment, the oxygen storage capacity calculation module 34 may be further configured to calculate the circulating oxygen storage capacity if the coasting duration is greater than a preset duration threshold and the maximum value of the excess air coefficient is greater than a preset value.

[0052] In one embodiment, the oxygen storage capacity calculation module 34 may be further configured to calculate the circulating oxygen storage capacity based on the excess air coefficient and the engine intake flow rate of the target vehicle from the first time to the second time.

[0053] In one embodiment, the oxygen storage capacity calculation module 34 may be further configured as follows: the calculation formula for the circulating oxygen storage capacity is: ;in, OSC is the circulating oxygen storage capacity of the target vehicle, λ is the excess air coefficient measured by the upstream oxygen sensor, Q is the intake air flow of the engine, t 1 is the first time when the target vehicle exits the coasting condition, t2 is the second time when the three-way catalytic converter completes oxygen release.

[0054] In one embodiment, the conversion efficiency determination module 35 may be further configured to determine the conversion efficiency of the three-way catalytic converter of the target vehicle based on the circulating oxygen storage capacity and the maximum oxygen storage capacity of the target vehicle.

[0055] Below, reference Figure 4 The electronic device according to the embodiment of the present application is described. The electronic device may be either or both of the first device and the second device, or a standalone device independent of them, and the standalone device may communicate with the first device and the second device to receive collected input signals from them.

[0056] Figure 4 The figure shows a block diagram of an electronic device according to an embodiment of the present application.

[0057] like Figure 4 As shown, the electronic device 10 includes one or more processors 11 and a memory 12 .

[0058] The processor 11 may be a central processing unit (CPU) or other forms of processing units having data processing capabilities and / or instruction execution capabilities, and may control other components in the electronic device 10 to perform desired functions.

[0059] The memory 12 may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory. The non-volatile memory may include, for example, read-only memory (ROM), a hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 11 may execute the program instructions to implement the methods of the various embodiments of the present application described above and / or other desired functions. Various contents such as input signals, signal components, and noise components may also be stored in the computer-readable storage medium.

[0060] In one example, the electronic device 10 may further include an input device 13 and an output device 14 , and these components are interconnected via a bus system and / or other forms of connection mechanisms (not shown).

[0061] When the electronic device is a stand-alone device, the input device 13 may be a communication network connector, configured to receive collected input signals from the first device and the second device.

[0062] In addition, the input device 13 may also include, for example, a keyboard, a mouse, and the like.

[0063] The output device 14 can output various information to the outside, including determined distance information, direction information, etc. The output device 14 can include, for example, a display, a speaker, a printer, a communication network and a remote output device connected thereto, and the like.

[0064] Of course, to simplify, Figure 4 Only some of the components related to the present application in the electronic device 10 are shown, and components such as a bus, an input / output interface, etc. are omitted. In addition, the electronic device 10 may further include any other appropriate components according to specific application scenarios.

[0065] In addition to the above-mentioned methods and devices, an embodiment of the present application may also be a computer program product, which includes computer program instructions, which, when executed by a processor, enable the processor to execute the steps of the method according to various embodiments of the present application described in the above-mentioned "Exemplary Method" section of this specification.

[0066] The computer program product may be written in any combination of one or more programming languages to implement the program code for performing the operations of the embodiments of the present application, including object-oriented programming languages such as Java, C++, and conventional procedural programming languages such as "C" or similar programming languages. The program code may be executed entirely on the user's computing device, partially on the user's computing device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0067] In addition, an embodiment of the present application may also be a computer-readable storage medium having computer program instructions stored thereon, which, when executed by a processor, enable the processor to execute the steps of the method according to various embodiments of the present application described in the above "Exemplary Method" section of this specification.

[0068] The computer-readable storage medium may be any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. The readable storage medium may include, for example, but is not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or device, or any combination thereof. More specific examples (a non-exhaustive list) of readable storage media include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof.

[0069] The basic principles of the present application have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, and effects mentioned in this application are merely illustrative and not restrictive, and it should not be assumed that these advantages, strengths, and effects are required of each embodiment of this application. In addition, the specific details disclosed above are merely illustrative and facilitating understanding, and are not restrictive. The above details do not limit this application to necessarily being implemented using the above specific details.

[0070] The block diagrams of the devices, devices, equipment, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As will be appreciated by those skilled in the art, these devices, devices, equipment, and systems can be connected, arranged, or configured in any manner. Words such as "include," "comprise," "have," and the like are open-ended words, meaning "including but not limited to," and can be used interchangeably therewith. The words "or" and "and" used herein refer to the words "and / or" and can be used interchangeably therewith, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to," and can be used interchangeably therewith.

[0071] It should also be noted that in the apparatus, device, and method of the present application, each component or each step can be decomposed and / or recombined, and such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0072] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0073] The above description has been provided for the purpose of illustration and description. Furthermore, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A method for diagnosing the conversion efficiency of a three-way catalytic converter, characterized in that: include: Obtaining the operating status parameters of the target vehicle; Determining the operating state of the target vehicle based on the operating state parameters, wherein the operating state parameters include a vehicle speed and an engine speed of the target vehicle; if the vehicle speed continues to decrease and the engine speed is greater than or equal to an idle speed, determining that the operating state of the target vehicle is a coasting state, wherein a difference between the engine speed and the idle speed is less than a preset speed difference; If the running state of the target vehicle is a coasting state, calculating a coasting cumulative parameter of the target vehicle; wherein the coasting cumulative parameter represents a cumulative value of characteristic parameters of the target vehicle in the coasting state; If the coasting cumulative parameter satisfies a preset condition, the circulating oxygen storage amount from a first time when the target vehicle exits the coasting state to a second time when the three-way catalytic converter completes oxygen release is calculated; if the target vehicle does not enter a coasting state that satisfies the preset condition during the current driving process, a fixed time frame is used to move on the current operating state parameter curve of the target vehicle to intercept multiple curve segments, and the proportion of the coasting state in each curve segment is calculated. If there is a curve with a proportion greater than a preset proportion threshold, the curve corresponding to the largest proportion is selected as the target curve, and the end point of the coasting state curve at the rear of the target curve is used as the first time; Based on the circulating oxygen storage amount, a conversion efficiency of a three-way catalytic converter of the target vehicle is determined.

2. The conversion efficiency diagnosis method of a three-way catalytic converter according to claim 1, characterized in that: The calculating of the coasting cumulative parameter of the target vehicle includes: Calculate the maximum value of the coasting time and excess air coefficient of the target vehicle in the coasting state.

3. The conversion efficiency diagnosis method of a three-way catalytic converter according to claim 2, characterized in that: If the coasting cumulative parameter satisfies a preset condition, calculating the circulating oxygen storage amount during a first time when the target vehicle exits the coasting state to a second time when the three-way catalytic converter completes oxygen release includes: If the coasting duration is greater than a preset duration threshold and the maximum value of the excess air coefficient is greater than a preset value, the circulating oxygen storage amount is calculated.

4. The conversion efficiency diagnosis method of a three-way catalytic converter according to claim 1, characterized in that: The calculating of the circulating oxygen storage amount during the first time when the target vehicle exits the coasting state to the second time when the three-way catalytic converter completes oxygen release comprises: The circulating oxygen storage amount is calculated based on the excess air coefficient and the engine intake flow rate of the target vehicle from the first time to the second time.

5. The method for diagnosing conversion efficiency of a three-way catalytic converter according to claim 4, characterized in that: The calculating the circulating oxygen storage capacity based on the excess air coefficient and the engine intake flow rate of the target vehicle from the first time to the second time includes: The calculation formula of the circulating oxygen storage capacity is: ； in, OSC is the circulating oxygen storage capacity of the target vehicle, λ is the excess air coefficient measured by the upstream oxygen sensor, Q is the intake air flow of the engine, t 1 is the first time when the target vehicle exits the coasting condition, t 2 is the second time when the three-way catalytic converter completes oxygen release.

6. The method for diagnosing conversion efficiency of a three-way catalytic converter according to claim 1, characterized in that: Determining the conversion efficiency of the three-way catalytic converter of the target vehicle based on the circulating oxygen storage capacity includes: A conversion efficiency of a three-way catalytic converter of the target vehicle is determined based on the circulating oxygen storage capacity and the maximum oxygen storage capacity of the target vehicle.

7. A three-way catalytic converter conversion efficiency diagnostic device, characterized in that: include: An operating parameter acquisition module is used to obtain the operating status parameters of the target vehicle; an operating state determining module, configured to determine the operating state of the target vehicle based on the operating state parameters, wherein the operating state parameters include the vehicle speed and engine speed of the target vehicle; if the vehicle speed continues to decrease and the engine speed is greater than or equal to the idle speed, then determining that the operating state of the target vehicle is a coasting state, wherein the difference between the engine speed and the idle speed is less than a preset speed difference; A coasting parameter calculation module, configured to calculate a coasting cumulative parameter of the target vehicle if the target vehicle is in a coasting state; wherein the coasting cumulative parameter represents a cumulative value of characteristic parameters of the target vehicle in the coasting state; an oxygen storage capacity calculation module, configured to calculate, if the coasting cumulative parameter satisfies a preset condition, the circulating oxygen storage capacity from a first time when the target vehicle exits the coasting state to a second time when the three-way catalytic converter completes oxygen release; if the target vehicle does not enter a coasting state satisfying the preset condition during the current driving process, move along the target vehicle's current operating state parameter curve using a fixed time frame to intercept multiple curve segments, calculate the proportion of the coasting state within each curve segment, and if a curve exists with a proportion greater than a preset proportion threshold, select the curve corresponding to the maximum proportion as the target curve, and use the end point of the coasting state curve at the rear of the target curve as the first time; The conversion efficiency determination module is used to determine the conversion efficiency of the three-way catalytic converter of the target vehicle based on the circulating oxygen storage amount.

8. A computer-readable storage medium, characterized in that The storage medium stores a computer program, and the computer program is used to execute the method according to any one of claims 1 to 6.

9. An electronic device, characterized in that: include: processor; a memory for storing instructions executable by the processor; The processor is configured to execute the method according to any one of claims 1 to 6.

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