Vehicle, and monitoring method, monitoring device and storage medium thereof

Abstract

The embodiment of the application discloses a kind of vehicle and its monitoring method, monitoring device and storage medium, the monitoring method of vehicle includes in the heating stage of catalyst, obtains the actual temperature value of catalyst currently, obtains the temperature calculation value of catalyst currently according to the exhaust temperature value of engine, based on temperature calculation value and the temperature contribution value of cold start emission reduction measure that vehicle adopts to catalyst, set the target temperature value of catalyst, when the absolute value of the difference between the actual temperature value of catalyst and target temperature value is greater than preset difference, fault alarm is carried out, the overall influence of multiple cold start emission reduction measures to catalyst temperature is considered to carry out fault alarm, to avoid the problem that the fault of single measure does not reach alarm condition, and multiple measures fail simultaneously and cause emission to be over limit but cannot carry out fault alarm, it is helpful to accurately monitor the effect of engine cold start emission reduction measure.

Description

Technical Field

[0001] This invention relates to the field of vehicle engine technology, and more particularly to a vehicle and its monitoring method, monitoring device and storage medium. Background Technology

[0002] As environmental awareness continues to increase in various countries, the standards for controlling vehicle emissions are becoming increasingly stringent. Existing technologies generally include devices for the preliminary treatment of vehicle emissions. A typical device for reducing emissions from gasoline engines is the three-way catalytic converter. The three-way catalytic converter must operate normally under certain high-temperature conditions. Since emissions from engine cold starts account for the majority of the entire driving cycle, gasoline engines are equipped with cold-start emission reduction measures to enable rapid ignition of the three-way catalytic converter and increase its temperature to meet its operating conditions.

[0003] Existing cold start emission reduction diagnostic strategies diagnose each cold start emission reduction measure separately and set diagnostic thresholds based on the impact of a single measure's failure on emissions to ensure that faults are reported before emissions exceed OBD limits. When multiple measures fail to varying degrees, the overall impact may cause emissions to exceed OBD limits, but the failure of each individual cold start emission reduction measure may not reach the level required for reporting a fault, resulting in the failure to report the fault, promptly reminding users to repair the vehicle, and failing to guarantee that vehicle emissions meet regulatory requirements.

[0004] Therefore, there is an urgent need for a solution that can accurately and efficiently monitor the effectiveness of emission reduction measures during engine cold starts. Summary of the Invention

[0005] This invention provides a vehicle and its monitoring method, monitoring device and storage medium to solve the problem that the existing technology cannot accurately and efficiently monitor the effectiveness of engine cold start emission reduction measures.

[0006] According to one aspect of the present invention, a vehicle monitoring method is provided, comprising: during the heating phase of a catalyst, acquiring the current actual temperature value of the catalyst;

[0007] The current temperature of the catalyst is calculated based on the engine's exhaust temperature.

[0008] Based on the calculated temperature value and the contribution of the cold start emission reduction measures adopted by the vehicle to the temperature of the catalyst, the target temperature value of the catalyst is set.

[0009] A fault alarm is triggered when the absolute value of the difference between the actual temperature value and the target temperature value of the catalyst is greater than a preset difference.

[0010] Optionally, the current temperature of the catalytic converter can be calculated based on the engine's exhaust temperature, including:

[0011] Calculate the exhaust temperature of the engine based on the current operating parameters of the engine.

[0012] The exhaust temperature value is corrected based on the engine's exhaust flow rate to obtain the current calculated temperature value of the catalyst.

[0013] Optionally, the exhaust temperature value of the engine is calculated based on the current operating condition parameters of the engine, including:

[0014] The base exhaust temperature of the engine is determined based on the current engine speed and intake air volume.

[0015] The first exhaust temperature increment is determined based on the engine's current ignition efficiency and air-fuel ratio.

[0016] The second exhaust temperature increment is determined based on the current engine coolant temperature and ambient temperature.

[0017] The sum of the base exhaust temperature, the first exhaust temperature increment, and the second exhaust temperature increment is determined as the exhaust temperature value of the engine.

[0018] Optionally, the exhaust temperature value is corrected based on the engine's exhaust flow rate to obtain the current calculated temperature value of the catalytic converter, including:

[0019] The product of the exhaust temperature value and the preset correction coefficient is determined as the current calculated temperature value of the catalyst, wherein the magnitude of the preset correction coefficient is positively correlated with the magnitude of the intake air flow of the exhaust pipe.

[0020] Optionally, the target temperature value is the sum of the temperature contribution of each of the cold start emission reduction measures to the catalyst and the calculated temperature value;

[0021] The target temperature value is calculated as follows:

[0022]

[0023] Among them, T sp T represents the target temperature value. i The value of T represents the temperature contribution of the cold start emission reduction measure described in the i-th item to the catalyst, where n ≥ 1. base The calculated temperature value.

[0024] Optionally, the vehicle monitoring method further includes:

[0025] Based on the degree of influence of the engine's operating condition parameters on the temperature of the catalyst, set the weight values ​​corresponding to the operating condition parameters;

[0026] Based on the degree of influence of the cold start emission reduction measures on the operating condition parameters and the weight values ​​of the operating condition parameters, the effect evaluation parameters of the cold start emission reduction measures are calculated.

[0027] The emission reduction effect of the cold start emission reduction measure is evaluated using the aforementioned effect evaluation parameters.

[0028] Optionally, the effect evaluation parameters are calculated as follows:

[0029]

[0030] Where Cn is the effect evaluation parameter, L j Sn represents the weight value of the j-th running condition parameter. j This represents the degree of influence of the cold start emission reduction measures on the j-th operating condition parameter, where m ≥ 1;

[0031] Where j = 4, the operating condition parameters include engine speed, intake air volume, ignition efficiency, and air-fuel ratio, and the performance evaluation parameters are calculated as follows:

[0032] Cn=Sn1×L1+Sn2×L2+Sn3×L3+Sn4×L4;

[0033] L1+L2+L3+L4=1;

[0034] Wherein, L1 represents the weight value of the rotational speed, L2 represents the weight value of the intake air volume, L3 represents the weight value of the ignition efficiency, and L4 represents the weight value of the air-fuel ratio.

[0035] According to another aspect of the present invention, a vehicle monitoring device is provided, comprising: an actual temperature value acquisition module, configured to acquire the current actual temperature value of the catalyst during the heating phase of the catalyst;

[0036] A temperature calculation value determination module is used to obtain the current temperature calculation value of the catalyst based on the exhaust temperature value of the engine;

[0037] The target temperature setting module is used to set the target temperature value of the catalyst based on the calculated temperature value and the temperature contribution value of the cold start emission reduction measures adopted by the vehicle to the catalyst.

[0038] The fault alarm module is used to issue a fault alarm when the absolute value of the difference between the actual temperature value and the target temperature value of the catalyst is greater than a preset difference value.

[0039] According to another aspect of the present invention, a vehicle is provided, the vehicle comprising:

[0040] At least one processor; and

[0041] A memory communicatively connected to the at least one processor; wherein,

[0042] The memory stores a computer program that can be executed by the at least one processor, which enables the at least one processor to perform the vehicle monitoring method according to any embodiment of the present invention.

[0043] According to another aspect of the present invention, a computer-readable storage medium is provided, the computer-readable storage medium storing computer instructions for causing a processor to execute and implement the vehicle monitoring method according to any embodiment of the present invention.

[0044] The vehicle, monitoring method, monitoring device, and storage medium provided in this invention embodiment reflect the effect of cold start emission reduction measures by the deviation between the actual temperature value and the target temperature value of the catalytic converter. It realizes the overall impact of multiple cold start emission reduction measures on the catalytic converter temperature for fault alarm, so as to avoid the problem that the fault of a single measure fails to meet the alarm conditions, while multiple measures fail simultaneously, resulting in emissions exceeding the limit but no fault alarm can be triggered. It helps to accurately monitor the effect of engine cold start emission reduction measures and can accurately and efficiently monitor the effectiveness of engine cold start emission reduction measures.

[0045] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 This is a schematic flowchart of a vehicle monitoring method provided in Embodiment 1 of the present invention;

[0048] Figure 2 This is a schematic flowchart of a vehicle monitoring method provided in Embodiment 2 of the present invention;

[0049] Figure 3 This is a schematic diagram of the structure of a vehicle monitoring device provided in Embodiment 3 of the present invention;

[0050] Figure 4 This is a structural schematic diagram of a vehicle provided in Embodiment 4 of the present invention. Detailed Implementation

[0051] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0052] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0053] Example 1

[0054] Figure 1 This is a flowchart illustrating a vehicle monitoring method provided in Embodiment 1 of the present invention, as shown below. Figure 1 As shown, the method includes:

[0055] S110. During the heating phase of the catalyst, obtain the current actual temperature value of the catalyst.

[0056] Specifically, at room temperature, the catalyst does not have catalytic ability. Its catalyst must be heated to a certain temperature to have the ability to oxidize or reduce. In this embodiment, the catalyst enters the heating stage when the engine is started, thereby converting harmful substances in the exhaust gas into harmless substances. After the catalyst enters the heating stage, the actual temperature value of the catalyst heating stage can be obtained by a temperature sensor.

[0057] S120: Calculate the current temperature of the catalytic converter based on the engine's exhaust temperature.

[0058] Specifically, the catalytic converter's air intake is connected to the engine's exhaust manifold. The catalytic converter is heated by the waste heat generated by the engine's operation. Therefore, the higher the engine's exhaust temperature, the higher the catalytic converter's temperature. In this embodiment, the current temperature of the catalytic converter can be calculated by obtaining the engine's exhaust temperature value.

[0059] S130. Based on the temperature calculation value and the temperature contribution value of the cold start emission reduction measures adopted by the vehicle to the catalyst, set the target temperature value of the catalyst.

[0060] Specifically, vehicle cold start refers to starting a vehicle after a prolonged period of inactivity when the engine is at a low temperature. In this case, measures are needed to quickly raise the temperature of the catalytic converter to meet its operating temperature requirements, thereby reducing emissions during a cold start. These measures are called cold start emission reduction measures, and the contribution of these measures to the catalytic converter temperature is the contribution value of the cold start emission reduction measures to the catalytic converter temperature increase. In this embodiment, the contribution value of the cold start emission reduction measures to the catalytic converter temperature can be pre-determined through multiple experimental measurements and statistics. For example, the temperature value of the catalytic converter without cold start emission reduction measures and the temperature value of the catalytic converter after adopting a certain cold start emission reduction measure can be measured and recorded. The difference between the two values ​​can be considered the temperature contribution value of that cold start emission reduction measure to the catalytic converter. The target temperature value of the catalytic converter is the theoretically achievable temperature value of the catalytic converter after the vehicle adopts cold start emission reduction measures. This target temperature value is easily understood to be within the suitable operating temperature range of the catalytic converter.

[0061] S140. When the absolute value of the difference between the actual temperature value and the target temperature value of the catalyst is greater than the preset difference, a fault alarm is triggered.

[0062] Specifically, the preset difference value can be set according to the suitable operating temperature range of the catalytic converter. The larger the absolute value of the difference between the actual temperature value and the target temperature value of the catalytic converter, the worse the effect of the cold start emission reduction measures. When the absolute value of the difference between the actual temperature value and the target temperature value of the catalytic converter is greater than the preset difference value, it can be determined that the actual temperature value of the catalytic converter is not within the suitable operating temperature range of the catalytic converter, and it cannot effectively treat engine exhaust pollutants. The emission of pollutants is high. If the catalytic converter operates at this temperature for a long time, the engine exhaust will exceed the emission limits for pollutants. Therefore, when the absolute value of the difference between the actual temperature value and the target temperature value of the catalytic converter is greater than the preset difference value, a fault alarm is triggered. This can remind the user to have the vehicle inspected before the emission of engine exhaust pollutants exceeds the emission limits, thus preventing the emission of engine exhaust pollutants from exceeding the standards and ensuring that the vehicle's emissions meet regulatory requirements.

[0063] The technical solution of this invention obtains the actual temperature value of the catalytic converter during the heating stage and uses this temperature value to monitor the effect of cold start emission reduction measures adopted by the vehicle. It considers both energy accumulation and heat loss through energy exchange. The current temperature of the catalytic converter is calculated based on the exhaust temperature value of the engine. Based on the calculated temperature value and the temperature contribution value of each cold start emission reduction measure to the catalytic converter, a target temperature value of the catalytic converter is set. The effect of each cold start emission reduction measure is monitored based on the deviation between the actual temperature value and the target temperature value. This achieves fault alarm by comprehensively considering the overall impact of multiple cold start emission reduction measures on the catalytic converter temperature, thus avoiding the problem that a single measure's failure to meet the alarm conditions, while multiple measures malfunctioning simultaneously and causing emissions exceeding limits, cannot trigger a fault alarm. This helps to accurately monitor the effect of engine cold start emission reduction measures.

[0064] Example 2

[0065] Figure 2 This is a flowchart illustrating a vehicle monitoring method provided in Embodiment 2 of the present invention, as shown below. Figure 2 As shown, the method includes:

[0066] S210. During the heating phase of the catalyst, obtain the current actual temperature value of the catalyst.

[0067] S221. Calculate the engine exhaust temperature value based on the current operating parameters of the engine.

[0068] Specifically, operating condition parameters are various parameters that affect the engine's operating status while the engine is running. These parameters include ignition efficiency, air-fuel ratio, engine speed, intake air volume, engine coolant temperature, and ambient temperature.

[0069] Optionally, the calculation of the engine exhaust temperature value based on the current operating condition parameters of the engine includes: determining the basic exhaust temperature of the engine based on the current engine speed and intake volume; determining the first exhaust temperature increment based on the current engine ignition efficiency and air-fuel ratio; determining the second exhaust temperature increment based on the current engine coolant temperature and ambient temperature; and determining the sum of the basic exhaust temperature, the first exhaust temperature increment, and the second exhaust temperature increment as the engine exhaust temperature value.

[0070] In this embodiment, the correspondence between various operating condition parameters of the engine and exhaust temperature values ​​can be obtained in advance through multiple experimental measurements and statistics, and a reference table (e.g., MAP table) of different operating condition parameters of the engine and exhaust temperature values ​​can be generated. This reference table is stored in the microcontroller unit of the vehicle. By obtaining the current operating condition parameters of the engine, the temperature value corresponding to the operating condition parameters is determined by looking up the table, so as to determine the basic exhaust temperature and exhaust temperature increment of the engine, and then the exhaust temperature value of the engine is calculated.

[0071] In one implementation, a table relating different engine operating parameters to exhaust temperature values ​​can be obtained as follows: Under the same conditions (i.e., ignition efficiency, air-fuel ratio, engine coolant temperature, and ambient temperature are initial default values), the exhaust temperature of the engine is measured multiple times under different engine speeds and intake air volumes to obtain the correspondence between engine speed, intake air volume, and exhaust temperature, generating a table relating engine speed, intake air volume, and exhaust temperature. Based on this correspondence, the influence of different ignition efficiencies and air-fuel ratios on exhaust temperature is measured multiple times by changing the engine's ignition efficiency and air-fuel ratio (exhaust temperature gain), resulting in a table relating ignition efficiency and air-fuel ratio to exhaust temperature gain. Finally, based on the correspondence between engine speed, intake air volume, and baseline exhaust temperature values, the influence of engine coolant temperature and ambient temperature on exhaust temperature is measured multiple times by changing the engine coolant temperature and ambient temperature, resulting in a table relating coolant temperature, ambient temperature, and exhaust temperature increments.

[0072] For example, the exhaust temperature value of the engine can be calculated based on the current operating conditions of the engine as follows: Obtain the current engine speed and intake air volume; refer to a table comparing engine speed and intake air volume with exhaust temperature to determine the exhaust temperature corresponding to the current engine speed and intake air volume, which is used as the base exhaust temperature and denoted as Ta; Obtain the current engine ignition efficiency and air-fuel ratio; refer to a table comparing ignition efficiency and air-fuel ratio with exhaust temperature gain to determine the exhaust temperature gain corresponding to the current engine ignition efficiency and air-fuel ratio, denoted as K, thus obtaining the first exhaust temperature increment corresponding to the current engine ignition efficiency and air-fuel ratio, denoted as K*Ta; Obtain the current engine coolant temperature and ambient temperature; refer to a table comparing coolant temperature and ambient temperature with exhaust temperature increments to determine the exhaust temperature increment corresponding to the current engine coolant temperature and ambient temperature, which is used as the second exhaust temperature increment and denoted as Tc; Record the engine exhaust temperature value as T. 排气 Then T 排气 =Ta + K * Ta + Tc.

[0073] S222. Correct the exhaust temperature value based on the engine's exhaust flow rate to obtain the current calculated temperature value of the catalytic converter. Optionally, correcting the exhaust temperature value based on the engine's exhaust flow rate to obtain the current calculated temperature value of the catalytic converter includes: determining the product of the exhaust temperature value and a preset correction coefficient as the current calculated temperature value of the catalytic converter, wherein the magnitude of the preset correction coefficient is positively correlated with the magnitude of the intake flow rate of the exhaust pipe.

[0074] Specifically, the catalytic converter temperature is related not only to the exhaust temperature but also to the engine's exhaust flow rate. Correcting the exhaust temperature based on the engine's exhaust flow rate to obtain the current calculated catalytic converter temperature helps improve the accuracy of the catalytic converter temperature reading. A preset correction factor characterizes the influence of the exhaust pipe's intake flow rate on the catalytic converter temperature. A larger intake flow rate corresponds to a larger preset correction factor and a greater influence on the catalytic converter temperature; conversely, a smaller intake flow rate corresponds to a smaller preset correction factor and a smaller influence. The exhaust temperature value is denoted as T. 排气 The preset correction factor is denoted as K2, and the current calculated temperature of the catalyst is denoted as T. base Then T base =K2*T 排气 .

[0075] In this embodiment, the correspondence between engine exhaust flow rate and catalyst temperature value can be obtained in advance through multiple experimental measurements and statistics. For example, when the engine exhaust temperature is constant, the actual catalyst temperature value of the engine under the same exhaust flow rate is measured multiple times, and the ratio of the actual catalyst temperature value and the exhaust temperature value under the same exhaust flow rate is defined as the preset correction coefficient under that exhaust flow rate.

[0076] S230. Based on the temperature calculation value and the temperature contribution value of the cold start emission reduction measures adopted by the vehicle to the catalyst, set the target temperature value of the catalyst.

[0077] Specifically, the target temperature value is the sum of the temperature contribution of each cold start emission reduction measure to the catalyst and the calculated temperature value. The target temperature value is calculated as follows:

[0078]

[0079] Among them, T sp The target temperature value, T i Let T be the temperature contribution of the i-th cold start emission reduction measure to the catalyst, n≥1. base This is a calculated temperature value.

[0080] In this embodiment, the temperature contribution of the cold start emission reduction measure to the catalyst can be obtained in advance through multiple experimental measurements and statistics. For example, the temperature value of the catalyst when no cold start emission reduction measure is adopted and the temperature value of the catalyst after adopting a certain cold start emission reduction measure can be measured and recorded. The difference between the two can be identified as the temperature contribution of the cold start emission reduction measure to the catalyst.

[0081] S240. When the absolute value of the difference between the actual temperature value and the target temperature value of the catalyst is greater than the preset difference, a fault alarm is triggered.

[0082] Optionally, based on the above embodiments, the vehicle monitoring method further includes: setting weight values ​​corresponding to the operating condition parameters according to the degree of influence of the engine operating condition parameters on the temperature of the catalyst; calculating the effect evaluation parameters of the cold start emission reduction measures based on the degree of influence of the cold start emission reduction measures on the operating condition parameters and the weight values ​​of the operating condition parameters; and using the effect evaluation parameters to evaluate the emission reduction effect of the cold start emission reduction measures.

[0083] The effect evaluation parameters are calculated as follows:

[0084]

[0085] Where Cn is the effect evaluation parameter, L j Sn represents the weight value of the j-th runtime condition parameter. j This represents the degree of influence of cold start emission reduction measures on the j-th operating condition parameter, where m ≥ 1.

[0086] Specifically, the impact of different engine operating condition parameters on catalytic converter temperature varies. In this embodiment, the impact of engine operating condition parameters on catalytic converter temperature can be pre-determined through multiple experimental measurements and statistical analysis. The impact of cold start emission reduction measures on operating condition parameters also varies. In this embodiment, the impact of cold start emission reduction measures on operating condition parameters can be pre-determined through multiple experimental measurements and statistical analysis. For example, the values ​​of various engine operating condition parameters without cold start emission reduction measures and the values ​​of various engine operating condition parameters after adopting a certain cold start emission reduction measure can be measured and recorded. The impact of cold start emission reduction measures on operating condition parameters can be obtained based on the changes in various engine operating condition parameters before and after adopting a certain cold start emission reduction measure. Based on the impact of cold start emission reduction measures on operating condition parameters and the weight values ​​of these parameters, effectiveness evaluation parameters for each cold start emission reduction measure are calculated. The larger the value of the effectiveness evaluation parameter for each cold start emission reduction measure, the worse its effectiveness, indicating a greater degree of aging. Users can monitor the aging degree of each cold start emission reduction measure based on the effectiveness evaluation parameters, facilitating problem identification and timely reminders to inspect vehicles to ensure that vehicle emissions meet regulatory requirements.

[0087] In this embodiment, j=4, and the operating condition parameters include engine speed, intake air volume, ignition efficiency, and air-fuel ratio. The performance evaluation parameters are calculated as follows:

[0088] Cn=Sn1×L1+Sn2×L2+Sn3×L3+Sn4×L4;

[0089] L1+L2+L3+L4=1;

[0090] Where L1 represents the weight value of engine speed, L2 represents the weight value of intake air volume, L3 represents the weight value of ignition efficiency, and L4 represents the weight value of air-fuel ratio.

[0091] Example 3

[0092] Figure 3 This is a schematic diagram of the structure of a vehicle monitoring device provided in Embodiment 3 of the present invention. Figure 3 As shown, the device includes:

[0093] The actual temperature value acquisition module 10 is used to acquire the current actual temperature value of the catalyst during the heating stage of the catalyst.

[0094] Optionally, the actual temperature value acquisition module 10 includes a temperature sensor, which is located in the catalyst and is used to acquire the actual temperature value during the catalyst heating stage.

[0095] Temperature calculation value determination module 11 is used to obtain the current temperature calculation value of the catalytic converter based on the exhaust temperature value of the engine.

[0096] The target temperature setting module 12 is used to set the target temperature value of the catalyst based on the temperature calculation value and the temperature contribution value of the cold start emission reduction measures adopted by the vehicle to the catalyst.

[0097] The fault alarm module 13 is used to trigger a fault alarm when the absolute value of the difference between the actual temperature value and the target temperature value of the catalyst is greater than a preset difference.

[0098] The vehicle monitoring device provided in this embodiment of the invention includes an actual temperature value acquisition module, a temperature calculation value determination module, a target temperature value setting module, and a fault alarm module. The actual temperature value acquisition module is used to acquire the current actual temperature value of the catalytic converter during the heating stage of the catalytic converter, and uses this temperature value to monitor the effect of the cold start emission reduction measures adopted by the vehicle, taking into account both energy accumulation and heat exchange loss. The temperature calculation value determination module is used to obtain the current temperature calculation value of the catalytic converter based on the exhaust temperature value of the engine. The target temperature value setting module is used to set the target temperature value of the catalytic converter based on the temperature calculation value and the temperature contribution value of the cold start emission reduction measures adopted by the vehicle to the catalytic converter. The fault alarm module is used to issue a fault alarm when the absolute value of the difference between the actual temperature value and the target temperature value of the catalytic converter is greater than a preset difference value. The effect of cold start emission reduction measures is reflected by the deviation between the actual temperature value and the target temperature value of the catalytic converter. This achieves fault alarm by comprehensively considering the overall impact of multiple cold start emission reduction measures on the catalytic converter temperature, thus avoiding the problem that a single measure's failure to meet the alarm conditions, or multiple measures failing simultaneously and causing emissions to exceed limits without triggering a fault alarm, can accurately and efficiently monitor the effectiveness of engine cold start emission reduction measures.

[0099] Optionally, the temperature calculation value determination module specifically includes:

[0100] The exhaust temperature calculation unit is used to calculate the exhaust temperature of the engine based on the current operating conditions of the engine.

[0101] The temperature calculation value determination unit is used to correct the exhaust temperature value based on the engine's exhaust flow rate to obtain the current calculated temperature value of the catalytic converter.

[0102] Optionally, the vehicle monitoring device also includes:

[0103] The weight value determination module is used to set the weight values ​​corresponding to the operating condition parameters based on the degree of influence of the engine's operating condition parameters on the temperature of the catalytic converter.

[0104] The effect evaluation parameter determination module is used to calculate the effect evaluation parameters of cold start emission reduction measures based on the degree of influence of cold start emission reduction measures on operating condition parameters and the weight values ​​of operating condition parameters.

[0105] The emission reduction effect evaluation module is used to evaluate the emission reduction effect of cold start emission reduction measures using effect evaluation parameters.

[0106] Example 4

[0107] Figure 4 This is a structural schematic diagram of a vehicle provided in Embodiment 4 of the present invention. Figure 4 As shown, the vehicle includes a processor 40 and a memory 41. The number of processors 40 in the vehicle can be one or more. Figure 4 Taking a processor 40 as an example, the processor 40 and memory 41 in the vehicle can be connected via a bus or other means. Figure 4 Taking the example of a connection between China and Israel via a bus.

[0108] The memory 41 serves as a storage medium and can be used to store software programs, computer-executable programs, and modules, such as the program module corresponding to the vehicle monitoring method in this embodiment of the invention. The processor 40 executes various system functions and data processing by running the software programs, instructions, and modules stored in the memory 41, thereby realizing the aforementioned vehicle monitoring method.

[0109] The memory 41 may primarily include a program storage area and a data storage area. The program storage area may store the operating system and at least one application program required for a given function, while the data storage area may store data created based on terminal usage. Furthermore, the memory 41 may include high-speed random access memory and non-volatile memory, such as at least one disk storage device, flash memory, or other non-volatile solid-state storage device. In some instances, the memory 41 may further include memory remotely located relative to the processor 40, which can be connected to the system via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0110] Example 5

[0111] Embodiment 5 of the present invention also provides a computer-readable storage medium containing computer instructions for causing a processor to execute and implement any of the vehicle monitoring methods described in the above embodiments.

[0112] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0113] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for monitoring vehicles, characterized in that, include: During the heating phase of the catalyst, the current actual temperature value of the catalyst is obtained; The current temperature of the catalyst is calculated based on the engine's exhaust temperature. Based on the calculated temperature value and the temperature contribution of the cold start emission reduction measures adopted by the vehicle to the catalyst, a target temperature value for the catalyst is set, wherein the target temperature value is the sum of the temperature contribution of each of the cold start emission reduction measures to the catalyst and the calculated temperature value; A fault alarm is triggered when the absolute value of the difference between the actual temperature value and the target temperature value of the catalyst is greater than a preset difference. The current temperature of the catalytic converter is calculated based on the engine's exhaust temperature, including: Calculate the exhaust temperature of the engine based on the current operating parameters of the engine. The exhaust temperature value is corrected based on the exhaust flow rate of the engine to obtain the current calculated temperature value of the catalyst; Calculate the exhaust temperature value of the engine based on the current operating parameters of the engine, including: The base exhaust temperature of the engine is determined based on the current engine speed and intake air volume. The first exhaust temperature increment is determined based on the engine's current ignition efficiency and air-fuel ratio. The second exhaust temperature increment is determined based on the current engine coolant temperature and ambient temperature. The sum of the base exhaust temperature, the first exhaust temperature increment, and the second exhaust temperature increment is determined as the exhaust temperature value of the engine.

2. The vehicle monitoring method according to claim 1, characterized in that, The exhaust temperature value is corrected based on the engine's exhaust flow rate to obtain the current calculated temperature value of the catalytic converter, including: The product of the exhaust temperature value and the preset correction coefficient is determined as the current calculated temperature value of the catalyst, wherein the magnitude of the preset correction coefficient is positively correlated with the magnitude of the intake air flow of the exhaust pipe.

3. The vehicle monitoring method according to claim 1, characterized in that, The target temperature value is calculated as follows: ； Among them, T sp T represents the target temperature value. i The value of T represents the temperature contribution of the cold start emission reduction measure described in the i-th item to the catalyst, where n ≥ 1. base The temperature is the calculated value.

4. The vehicle monitoring method according to claim 1, characterized in that, The vehicle monitoring method also includes: Based on the degree of influence of the engine's operating condition parameters on the temperature of the catalyst, set the weight values ​​corresponding to the operating condition parameters; Based on the degree of influence of the cold start emission reduction measures on the operating condition parameters and the weight values ​​of the operating condition parameters, the effect evaluation parameters of the cold start emission reduction measures are calculated. The emission reduction effect of the cold start emission reduction measure is evaluated using the aforementioned effect evaluation parameters.

5. The vehicle monitoring method according to claim 4, characterized in that, The effect evaluation parameters are calculated as follows: ； Where Cn is the effect evaluation parameter, L j Sn represents the weight value of the j-th running condition parameter. j This represents the degree of influence of the cold start emission reduction measures on the j-th operating condition parameter, where m ≥ 1; Where j=4, the operating condition parameters include engine speed, intake air volume, ignition efficiency, and air-fuel ratio, and the performance evaluation parameters are calculated as follows: ； ； Wherein, L1 represents the weight value of the rotational speed, L2 represents the weight value of the intake air volume, L3 represents the weight value of the ignition efficiency, and L4 represents the weight value of the air-fuel ratio.

6. A vehicle monitoring device for performing the vehicle monitoring method according to any one of claims 1-5, characterized in that, include: The actual temperature value acquisition module is used to acquire the current actual temperature value of the catalyst during the heating stage of the catalyst. A temperature calculation value determination module is used to obtain the current temperature calculation value of the catalyst based on the exhaust temperature value of the engine; The target temperature setting module is used to set a target temperature value for the catalyst based on the calculated temperature value and the temperature contribution value of the cold start emission reduction measures adopted by the vehicle to the catalyst, wherein the target temperature value is the sum of the temperature contribution value of each of the cold start emission reduction measures to the catalyst and the calculated temperature value; The fault alarm module is used to issue a fault alarm when the absolute value of the difference between the actual temperature value and the target temperature value of the catalyst is greater than a preset difference value.

7. A vehicle, characterized in that, The vehicles include: At least one processor; and A memory communicatively connected to the at least one processor; wherein, The memory stores a computer program that can be executed by the at least one processor, the computer program being executed by the at least one processor to enable the at least one processor to perform the vehicle monitoring method according to any one of claims 1-5.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that, when executed by a processor, implement the vehicle monitoring method according to any one of claims 1-5.

Images