Method, device and apparatus for correcting response time of particulate matter sensor

Abstract

This application discloses a method, device, and apparatus for correcting the response time of a particulate matter sensor. These methods address the problem in related art where high ammonia leakage leads to increased current in the particulate matter sensor, impacting the accuracy of the PM sensor's monitoring of the DPF's particulate capture efficiency. When determining whether the PM sensor's current has reached its current limit, the present embodiment obtains the engine's real-time ammonia leakage and the real-time response time for the PM current to reach the current limit from zero at the current operating point. By comparing the PM current from zero to a preset current at different engine ammonia leakage values ​​at the same current operating point, a response time correction coefficient corresponding to the real-time ammonia leakage is obtained. Finally, the response time correction coefficient is used to correct the real-time response time. This eliminates the impact of ammonia leakage on the accuracy of DPF particulate capture efficiency monitoring.

Description

Technical Field

[0001] The present application relates to the technical field of automobile sensors, and in particular to a method, device and apparatus for correcting the response time of a particle sensor. Background Art

[0002] Currently, in related technologies, PM (Particulate Matter) sensors are installed at the end of the engine's aftertreatment system. When the engine's exhaust passes through the PM sensor, particulate matter, such as soot, is adsorbed on the electrodes on the sensor's surface. As the adsorbed particulate matter increases, a current is generated between the two electrodes. When the DPF (Diesel Particulate Filter)'s capture efficiency decreases, more particles leak downstream of the SCR (Selective Catalytic Reduction) system, gradually increasing the carbon load on the PM sensor and the resulting current between the PM sensor's electrodes. If the response time to the current exceeding the current error limit is less than the specified response time, the DPF is considered to have failed.

[0003] For engines equipped with a PM sensor, when the ammonia leakage rate is high, the leaked ammonia and water form ammonia water, causing the current measured by the PM sensor to be too large. Therefore, the response time for the PM sensor current to reach the current error limit is shortened. The high ammonia leakage rate causes the PM sensor current to increase, causing the PM sensor to mistakenly determine that the DPF has failed, affecting the accuracy of the PM sensor-based monitoring of the DPF's particulate capture efficiency. Summary of the Invention

[0004] The purpose of this application is to provide a method, device and equipment for correcting the response time of a particulate matter sensor, so as to solve the problem in the related art that high ammonia leakage causes the current of the particulate matter sensor to increase, thereby affecting the accuracy of monitoring the particle capture efficiency of the DPF based on the PM sensor.

[0005] In a first aspect, the present application provides a method for correcting the response time of a particulate matter sensor, which is applied to an engine exhaust system. The method comprises:

[0006] When it is determined that the current of the PM particulate matter sensor reaches the current limit, the real-time ammonia leakage of the engine under the current operating point and the real-time response time for the current of the PM particulate matter sensor to reach the current limit from zero are obtained;

[0007] Based on a predetermined first control response time for the PM current to reach a preset current from zero when the engine ammonia leakage amount is zero at a real-time operating point, and a second control response time for the PM current to reach a preset current at different engine ammonia leakage amounts at the real-time operating point, a response time correction coefficient corresponding to the real-time ammonia leakage amount is obtained according to the first control response time and the second control response time corresponding to the real-time ammonia leakage amount;

[0008] The real-time response time is corrected according to the response time correction coefficient to obtain a corrected response time corresponding to the real-time ammonia leakage amount.

[0009] In a possible implementation, obtaining the real-time ammonia leakage of the engine at the current real-time operating point includes:

[0010] Obtaining the actual urea injection amount and ammonia recovery amount of the selective catalytic reduction device at the current real-time operating point;

[0011] Obtaining a difference in nitrogen oxides upstream and downstream of the selective catalytic reduction device at a current real-time operating point, and obtaining an ammonia reaction amount based on the difference;

[0012] The real-time ammonia leakage amount of the engine at the current real-time operating point is obtained according to the actual urea injection amount, the ammonia recovery amount and the ammonia reaction amount.

[0013] In one possible implementation, the predetermining of a first comparison response time for the PM current to reach a preset current from zero when the ammonia leakage amount of the engine is zero at a real-time operating point, and a second comparison response time for the PM current to reach a preset current from zero at different ammonia leakage amounts of the engine at the real-time operating point, includes:

[0014] The engine operating point is adjusted to a plurality of different operating points by a controller, and the actual urea injection amount of the selective catalytic reduction device is adjusted so that the ammonia leakage amount of the engine is different values;

[0015] Determining a first control response time for the PM current to reach a preset current from zero when the engine ammonia leakage amount is zero at different operating points, and a second control response time for the PM current to reach the preset current from zero at different engine ammonia leakage amounts at different operating points;

[0016] A first control response time for the PM current to reach a preset current from zero when the ammonia leakage amount of the engine is zero at the real-time operating point is selected from the first control response time, and a second control response time for the PM current to reach a preset current from zero when the ammonia leakage amount of the engine is the real-time ammonia leakage amount at the real-time operating point is selected from the second control response time.

[0017] In a possible implementation, adjusting the engine operating point to a plurality of different operating points by the controller includes:

[0018] The engine's SCR downstream temperature and exhaust gas flow rate are adjusted to multiple different values ​​by a controller;

[0019] Any SCR downstream temperature among the multiple different SCR downstream temperature values ​​and any exhaust gas flow rate among the multiple exhaust gas flow rate values ​​are matched as an operating point to obtain multiple different operating points.

[0020] In one possible implementation, the response time correction coefficient corresponding to the real-time ammonia leakage amount is obtained by using the following response time correction coefficient determination formula according to the first control response time and the second control response time corresponding to the real-time ammonia leakage amount:

[0021] f=t a / t b

[0022] Among them, t a represents the first control response time, t b represents the second control response time corresponding to the real-time ammonia leakage amount, and f represents the response time correction coefficient corresponding to the real-time ammonia leakage amount.

[0023] In a possible implementation, the following corrected response time determination formula is used to correct the real-time response time according to the response time correction coefficient to obtain the corrected response time corresponding to the real-time ammonia leakage amount:

[0024] T2=T1*f

[0025] Wherein, T1 represents the real-time response time, T2 represents the corrected response time corresponding to the real-time ammonia leakage amount, and f represents the response time correction coefficient.

[0026] In a second aspect, the present application provides a device for correcting the response time of a particulate matter sensor, which is applied to an engine exhaust system. The device includes:

[0027] a real-time data acquisition module configured to determine when the current of the PM sensor reaches the current limit, obtain the real-time ammonia leakage amount of the engine at the current operating point and the real-time response time of the PM current from zero to the current limit;

[0028] a response time correction coefficient determination module configured to determine, based on a predetermined first reference response time for a PM current to reach a preset current from zero when ammonia leakage amount of the engine is zero at a real-time operating point, and a predetermined second reference response time for a PM current to reach a preset current at different ammonia leakage amounts of the engine at the real-time operating point, the response time correction coefficient corresponding to the real-time ammonia leakage amount according to the first reference response time and the second reference response time corresponding to the real-time ammonia leakage amount;

[0029] The response time correction module is configured to correct the real-time response time according to the response time correction coefficient to obtain a corrected response time corresponding to the real-time ammonia leakage amount.

[0030] In a possible implementation, to obtain the real-time ammonia leakage of the engine at the current real-time operating point, the real-time data acquisition module is configured to:

[0031] Obtaining the actual urea injection amount and ammonia recovery amount of the selective catalytic reduction device at the current real-time operating point;

[0032] Obtaining a difference in nitrogen oxides upstream and downstream of the selective catalytic reduction device at a current real-time operating point, and obtaining an ammonia reaction amount based on the difference;

[0033] The real-time ammonia leakage amount of the engine at the current real-time operating point is obtained according to the actual urea injection amount, the ammonia recovery amount and the ammonia reaction amount.

[0034] In one possible implementation, the module for determining the response time correction factor is configured to: determine a first comparison response time for the PM current to reach a preset current from zero when the ammonia leakage amount of the engine is zero at a real-time operating point, and determine a second comparison response time for the PM current to reach a preset current from zero at different ammonia leakage amounts of the engine at the real-time operating point;

[0035] The engine operating point is adjusted to a plurality of different operating points by a controller, and the actual urea injection amount of the selective catalytic reduction device is adjusted so that the ammonia leakage amount of the engine is different values;

[0036] Determining a first control response time for the PM current to reach a preset current from zero when the engine ammonia leakage amount is zero at different operating points, and a second control response time for the PM current to reach the preset current from zero at different engine ammonia leakage amounts at different operating points;

[0037] A first control response time for the PM current to reach a preset current from zero when the ammonia leakage amount of the engine is zero at the real-time operating point is selected from the first control response time, and a second control response time for the PM current to reach a preset current from zero when the ammonia leakage amount of the engine is the real-time ammonia leakage amount at the real-time operating point is selected from the second control response time.

[0038] In one possible implementation, when adjusting the engine operating point to a plurality of different operating points by the controller, the response time correction coefficient determination module is configured to:

[0039] The engine's SCR downstream temperature and exhaust gas flow rate are adjusted to multiple different values ​​by a controller;

[0040] Any SCR downstream temperature among the multiple different SCR downstream temperature values ​​and any exhaust gas flow rate among the multiple exhaust gas flow rate values ​​are matched as an operating point to obtain multiple different operating points.

[0041] In one possible implementation, the response time correction coefficient determination module is configured to obtain the response time correction coefficient corresponding to the real-time ammonia leakage amount according to the first control response time and the second control response time corresponding to the real-time ammonia leakage amount using the following response time correction coefficient determination formula:

[0042] f=t a / t b

[0043] Among them, t a represents the first control response time, t b represents the second control response time corresponding to the real-time ammonia leakage amount, and f represents the response time correction coefficient corresponding to the real-time ammonia leakage amount.

[0044] In a possible implementation, the response time correction module is configured to use the following correction response time determination formula to correct the real-time response time according to the response time correction coefficient to obtain a correction response time corresponding to the real-time ammonia leakage amount:

[0045] T2=T1*f

[0046] Wherein, T1 represents the real-time response time, T2 represents the corrected response time corresponding to the real-time ammonia leakage amount, and f represents the response time correction coefficient.

[0047] In a third aspect, the present application provides an electronic device, comprising:

[0048] processor and memory;

[0049] The memory is used to store the processor executable instructions;

[0050] The processor is configured to execute the instructions to implement the method for correcting the response time of a particulate matter sensor according to any one of the first aspects.

[0051] In a fourth aspect, the present application provides a computer-readable storage medium. When the instructions in the computer-readable storage medium are executed by an electronic device, the electronic device can perform the method for correcting the response time of a particulate matter sensor as described in any one of the first aspects above.

[0052] In a fifth aspect, the present application provides a computer program product, including a computer program:

[0053] When the computer program is executed by a processor, the method for correcting the response time of a particulate matter sensor as described in any one of the first aspects above is implemented.

[0054] The technical solutions provided by the embodiments of this application bring at least the following beneficial effects:

[0055] In this embodiment of the present application, when determining that the current of the PM particulate matter sensor has reached the current limit, the real-time ammonia leakage of the engine and the real-time response time for the PM current to reach the current limit from zero are obtained at the current real-time operating point. A comparative experiment comparing the time when the PM current reaches a preset current from zero when the engine ammonia leakage reaches different values ​​at the same current real-time operating point is conducted to obtain a response time correction factor corresponding to the real-time ammonia leakage. Finally, the real-time response time is corrected using the response time correction factor. In summary, this embodiment of the present application takes into account the impact of ammonia leakage from the engine tail exhaust on the current of the PM sensor and adds a step to correct the PM sensor response time based on the ammonia leakage. This avoids the impact of ammonia leakage on the accuracy of monitoring the DPF's particulate capture efficiency, thereby ensuring accurate monitoring of the DPF's particulate capture efficiency.

[0056] Other features and advantages of the present application will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present application. The purposes and other advantages of the present application can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings introduced below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0058] Figure 1A schematic diagram of the architecture of an engine exhaust system provided in an embodiment of the present application;

[0059] Figure 2 A schematic diagram of the overall process of a method for correcting the response time of a particulate matter sensor provided in an embodiment of the present application;

[0060] Figure 3 A schematic diagram of a process for obtaining the real-time ammonia leakage of an engine at the current real-time operating point provided in an embodiment of the present application;

[0061] Figure 4 A flowchart of step 202 provided in an embodiment of the present application;

[0062] Figure 5 A schematic diagram of a flow chart of adjusting the engine operating point to a plurality of different operating points by a controller in step 401 provided in an embodiment of the present application;

[0063] Figure 6 A schematic diagram of the structure of a device for correcting the response time of a particulate matter sensor provided in an embodiment of the present application;

[0064] Figure 7 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0065] To make the purpose, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Among them, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0066] Moreover, in the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, “multiple” refers to two or more than two.

[0067] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to imply or suggest relative importance or implicitly indicate the number of the technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of this application, unless otherwise specified, "plurality" means two or more.

[0068] The following explains the relevant terms or devices involved in the embodiments of this application:

[0069] A particulate matter sensor (PM) is installed in the engine exhaust system and converts particulate matter concentration into a current value to monitor DPF conversion efficiency. The PM sensor primarily consists of a sensor probe, wiring harness, and control unit. The probe connector and control unit are non-detachable.

[0070] Diesel Oxidation Catalysis (DOC): Particulate matter oxidation catalytic technology involves coating a precious metal catalyst (such as Pt) on a honeycomb ceramic substrate. This technology aims to reduce the chemical activation energy of HC, CO, and SOF in engine exhaust, allowing these substances to react with oxygen in the exhaust at lower temperatures and ultimately convert into CO2 and H2O. Oxidation catalytic converters do not require a regeneration system or control device, and feature a simple structure and high reliability. They have been widely used in modern small engines.

[0071] Diesel Particulate Filter (DPF): A particulate filter installed in the engine exhaust system, using a porous carrier medium as its filter element. Particle capture technology primarily utilizes diffusion, deposition, and impaction mechanisms to trap particulate matter in engine exhaust. As exhaust flows through the DPF, particles are trapped within the filter element, leaving cleaner exhaust gas for discharge into the atmosphere. Currently, wall-flow honeycomb ceramic filters are the most widely used, primarily in construction machinery and city buses. While they are characterized by simple operation and high filtration efficiency, they present challenges such as filter regeneration and sensitivity to sulfur in the fuel.

[0072] Selective Catalytic Reduction (SCR): Selective catalytic reduction technology is used in diesel engine aftertreatment applications to reduce the amount of nitrogen oxides (NOx) in engine exhaust. NOx is one of the main harmful components of diesel engine exhaust. SCR works by injecting a reducing agent into the exhaust line. Under the catalytic action of a catalyst, the reducing agent reacts with NOx in the exhaust, thereby reducing NOx concentration.

[0073] The reducing agent currently used in SCR systems is ammonia (NH3). In practice, for ease of storage and transportation, a urea (NH2CONH2) aqueous solution (urea or AdBlue, a 32.5% urea aqueous solution) is often loaded onto vehicles. Urea is preheated in the exhaust gas line and hydrolyzed to produce ammonia and water. Ammonia then reacts with nitrogen oxides (primarily NO and NO2) in the exhaust gas to produce nitrogen and water.

[0074] Ammonia slip catalyst (ASC).

[0075] Particulate matter: The particulate matter contained in the engine exhaust generally includes two components: soot and ash. Soot generally refers to the part that can be burned through regeneration, and ash refers to the incombustible component. The incombustible component will continue to accumulate in the DPF. When a certain accumulation amount is reached, manual cleaning is required.

[0076] like Figure 3 This is a schematic diagram of the engine exhaust system architecture, showing the engine, DOC, DPF, SCR, ASC, and PM sensor connected sequentially. In related technology, the PM sensor is installed at the end of the engine exhaust system. As the engine's exhaust passes through the PM sensor, particulate matter such as soot in the exhaust gas is adsorbed on the electrodes on the sensor surface. As the adsorbed particulate matter increases, a current is generated between the two electrodes.

[0077] When the DPF's capture efficiency decreases, the carbon load leaking to the PM sensor downstream of the SCR will gradually increase, causing the current between the electrodes on the sensor to increase. When the current value exceeds the current error limit and the response time is less than the specified response time, the DPF is considered to have failed.

[0078] For engines equipped with a PM sensor, when the ammonia leakage rate is high, the leaked ammonia and water form ammonia water, causing the current measured by the PM sensor to be too large. Therefore, the response time for the PM sensor current to reach the current error limit is shortened. The high ammonia leakage rate causes the PM sensor current to increase, causing the PM sensor to mistakenly determine that the DPF has failed, affecting the accuracy of the PM sensor-based monitoring of the DPF's particulate capture efficiency.

[0079] In view of this, the present application provides a method, device and equipment for correcting the response time of a particulate matter sensor, which is used to solve the problem in the related art that high ammonia leakage causes the current of the particulate matter sensor to increase, affecting the accuracy of monitoring the particle capture efficiency of the DPF based on the PM sensor.

[0080] The inventive concept of this application can be summarized as follows: when determining that the current of the PM particulate matter sensor has reached the current limit, the real-time ammonia leakage of the engine and the real-time response time for the PM current to reach the current limit from zero are obtained at the current real-time operating point. By conducting comparative experiments comparing the PM current from zero to a preset current when the engine ammonia leakage is at different values ​​at the same current real-time operating point, a response time correction coefficient corresponding to the real-time ammonia leakage is obtained. Finally, the real-time response time is corrected using the response time correction coefficient. In summary, the embodiment of this application takes into account the impact of the ammonia leakage from the engine tail exhaust on the current of the PM sensor and adds a step to correct the PM sensor response time based on the ammonia leakage. This avoids the impact of the ammonia leakage on the accuracy of the DPF particulate matter capture efficiency monitoring, thereby ensuring the accuracy of the DPF particulate matter capture efficiency monitoring.

[0081] After introducing the main inventive concepts of the embodiments of this application, the following briefly introduces the application scenarios to which the technical solutions of the embodiments of this application can be applied. It should be noted that the application scenarios introduced below are only for the purpose of illustrating the embodiments of this application and are not limiting. In specific implementations, the technical solutions provided in the embodiments of this application can be flexibly applied according to actual needs.

[0082] To facilitate understanding of the method for correcting the response time of a particulate matter sensor provided in the embodiments of the present application, this will be further described below with reference to the accompanying drawings.

[0083] In a possible embodiment, the present application provides a method for correcting the response time of a particle sensor, which is applied to Figure 1 The engine exhaust system shown in the figure has an overall flow as follows Figure 2 As shown, including the following:

[0084] In step 201 , when it is determined that the current of the PM sensor reaches the current limit, the real-time ammonia leakage of the engine and the real-time response time for the current of the PM sensor to reach the current limit from zero are obtained at the current real-time operating point.

[0085] In a possible implementation, the process of obtaining the real-time ammonia leakage of the engine at the current real-time operating point is as follows: Figure 3 As shown, it can be implemented as the following steps:

[0086] In step 301 , the actual urea injection amount and ammonia recovery amount of the selective catalytic reduction device at the current real-time operating point are obtained.

[0087] In step 302 , the difference in nitrogen oxides between upstream and downstream of the selective catalytic reduction device at the current real-time operating point is obtained, and the ammonia reaction amount is obtained based on the difference.

[0088] In step 303 , the real-time ammonia leakage amount of the engine at the current real-time operating point is obtained according to the actual urea injection amount, the ammonia recovery amount and the ammonia reaction amount.

[0089] For example, the SCR downstream temperature at the current real-time operating point is 250°C and the exhaust gas flow rate is 300 3 / h, the actual urea injection amount of the selective catalytic reduction device is a. After being injected into the engine exhaust system, some ammonia that has not undergone chemical reaction will be recovered, and the ammonia recovery amount obtained by the sensor is b. The present application can also obtain the difference in nitrogen oxides upstream and downstream of the selective catalytic reduction device. According to the chemical equation for the reaction of nitrogen oxides and ammonia and the difference in nitrogen oxides (i.e., the amount participating in the chemical reaction), the ammonia reaction amount is c. Based on the actual urea injection amount a, the ammonia recovery amount b, and the ammonia reaction amount c, the real-time ammonia leakage amount of the engine at the current real-time operating point is d, where d=abc.

[0090] In a possible implementation manner, the embodiment of the present application directly reads the real-time response time of the PM current from zero to the current limit through the PM sensor.

[0091] In step 202, based on a predetermined first control response time for the PM current to reach a preset current from zero when the ammonia leakage amount of the engine is zero at the real-time operating point, and a second control response time for the PM current to reach a preset current from zero at different ammonia leakage amounts of the engine at the real-time operating point, a response time correction coefficient corresponding to the real-time ammonia leakage amount is obtained according to the first control response time and the second control response time corresponding to the real-time ammonia leakage amount.

[0092] In one possible embodiment, the embodiment of the present application predetermines, through comparative experiments, a first control response time for the PM current to reach a preset current from zero when the ammonia leakage of the engine is zero at a real-time operating point, and a second control response time for the PM current to reach a preset current from zero at different ammonia leakage amounts of the engine at a real-time operating point. The specific flow chart is as follows: Figure 4 As shown, including the following:

[0093] In step 401 , the operating point of the engine is adjusted to a plurality of different operating points by a controller, and the actual urea injection amount of the selective catalytic reduction device is adjusted so that the ammonia leakage amount of the engine is different.

[0094] In a possible implementation, in order to make the data of the comparative experiment cover a wider range of operating points, the operating point of the engine is adjusted to a plurality of different operating points by the controller in step 401, such as Figure 5 As shown, including the following:

[0095] In step 501 , the SCR downstream temperature and exhaust gas flow rate of the engine are adjusted to a plurality of different values ​​by a controller.

[0096] In step 502 , any SCR downstream temperature from a plurality of different SCR downstream temperature values ​​and any exhaust gas flow rate from a plurality of exhaust gas flow rate values ​​are matched as an operating point to obtain a plurality of different operating points.

[0097] For example, the engine's SCR downstream temperature can be adjusted to 250°C and 350°C, and the exhaust gas flow rate can be adjusted to 300°C. 3 / h and 60m 3 / h, any SCR downstream temperature among multiple different SCR downstream temperature values ​​and any exhaust gas flow rate among the multiple exhaust gas flow rates are matched as an operating point, that is, the embodiment of the present application can match two values ​​of SCR downstream temperature with two values ​​of exhaust gas flow rate one to one, such as the SCR downstream temperature is 250°C and the exhaust gas flow rate is 300 3 / h as a working point, the SCR downstream temperature is 250℃ and the exhaust gas flow rate is 60m 3 / h is taken as a working point, and so on, 4 different working points are obtained to match the real-time working point.

[0098] In addition, in step 401, the actual urea injection amount of the selective catalytic reduction device is adjusted so that the ammonia leakage amount of the engine is different values, including: the ammonia leakage amount is 0 when the actual urea injection amount of the selective catalytic reduction device is the same, the ammonia leakage amount is x when the actual urea injection amount is oversprayed by 1.5 times, and the ammonia leakage amount is y when the actual urea injection amount is oversprayed by 2 times, and so on. The present application adjusts the ammonia leakage amount of the engine by adjusting the actual urea injection amount of the selective catalytic reduction device, provides preparatory conditions for the completion of the comparative experiment, and provides more control data for the comparative experiment.

[0099] In the embodiment of the present application, after obtaining multiple different operating points in a comparative experiment and adjusting the engine ammonia leakage to multiple different values, a first control response time for the PM current to reach a preset current when the engine ammonia leakage is zero at each operating point is determined in step 402, as well as a second control response time for the PM current to reach a preset current when the engine ammonia leakage is zero at each operating point. Step 402 determines the control response times corresponding to multiple different operating points and different ammonia leakage levels through comparative experiments, facilitating the subsequent screening of the first and second control response times at the real-time operating point in step 403.

[0100] In step 403, a first control response time for the PM current to reach a preset current from zero when the ammonia leakage amount of the engine is zero at the real-time operating point is selected from the first control response time, and a second control response time for the PM current to reach a preset current from zero when the ammonia leakage amount of the engine is the real-time ammonia leakage amount at the real-time operating point is selected from the second control response time.

[0101] In one possible implementation, after the first control response time and the second control response time corresponding to the real-time ammonia leakage amount are screened and obtained in step 403, the response time correction coefficient corresponding to the real-time ammonia leakage amount is obtained using the following response time correction coefficient determination formula (1):

[0102] f=t a / t b (1)

[0103] Among them, t a represents the first control response time, t b represents the second control response time corresponding to the real-time ammonia leakage amount, and f represents the response time correction coefficient corresponding to the real-time ammonia leakage amount.

[0104] In step 203, the real-time response time is corrected according to the response time correction coefficient to obtain the corrected response time corresponding to the real-time ammonia leakage amount.

[0105] In one possible implementation, the embodiment of the present application uses the following corrected response time determination formula (2) to correct the real-time response time according to the response time correction coefficient to obtain the corrected response time corresponding to the real-time ammonia leakage amount:

[0106] T2=T1*f (2)

[0107] Wherein, T1 represents the real-time response time, T2 represents the corrected response time corresponding to the real-time ammonia leakage amount, and f represents the response time correction coefficient.

[0108] In summary, the embodiment of the present application takes into account the impact of the amount of ammonia leakage from the engine tail exhaust on the current of the PM sensor, adds a step of correcting the response time of the particulate matter sensor based on the amount of ammonia leakage, avoids the impact of the amount of ammonia leakage on the accuracy of monitoring the particle capture efficiency of the DPF, and thus ensures the monitoring accuracy of the particle capture efficiency of the DPF.

[0109] Based on the same inventive concept, the present application provides a device for correcting the response time of a particulate matter sensor, which is applied to an engine exhaust system, such as Figure 6 As shown, the apparatus 600 includes:

[0110] The real-time data acquisition module 601 is configured to obtain the real-time ammonia leakage of the engine and the real-time response time of the PM current from zero to the current limit at the current operating point when the current of the PM sensor reaches the current limit;

[0111] The response time correction coefficient determination module 602 is configured to determine, based on a predetermined first reference response time for the PM current to reach a preset current from zero when the engine ammonia leakage amount is zero at a real-time operating point, and a predetermined second reference response time for the PM current to reach a preset current at different engine ammonia leakage amounts at the real-time operating point, the response time correction coefficient corresponding to the real-time ammonia leakage amount according to the first reference response time and the second reference response time corresponding to the real-time ammonia leakage amount;

[0112] The response time correction module 603 is configured to correct the real-time response time according to the response time correction coefficient to obtain a corrected response time corresponding to the real-time ammonia leakage amount.

[0113] In a possible implementation, to obtain the real-time ammonia leakage of the engine at the current real-time operating point, the real-time data acquisition module is configured to:

[0114] Obtaining the actual urea injection amount and ammonia recovery amount of the selective catalytic reduction device at the current real-time operating point;

[0115] Obtaining a difference in nitrogen oxides upstream and downstream of the selective catalytic reduction device at a current real-time operating point, and obtaining an ammonia reaction amount based on the difference;

[0116] The real-time ammonia leakage amount of the engine at the current real-time operating point is obtained according to the actual urea injection amount, the ammonia recovery amount and the ammonia reaction amount.

[0117] In one possible implementation, the module for determining the response time correction factor is configured to: determine a first comparison response time for the PM current to reach a preset current from zero when the ammonia leakage amount of the engine is zero at a real-time operating point, and determine a second comparison response time for the PM current to reach a preset current from zero at different ammonia leakage amounts of the engine at the real-time operating point;

[0118] The engine operating point is adjusted to a plurality of different operating points by a controller, and the actual urea injection amount of the selective catalytic reduction device is adjusted so that the ammonia leakage amount of the engine is different values;

[0119] Determining a first control response time for the PM current to reach a preset current from zero when the engine ammonia leakage amount is zero at different operating points, and a second control response time for the PM current to reach the preset current from zero at different engine ammonia leakage amounts at different operating points;

[0120] A first control response time for the PM current to reach a preset current from zero when the ammonia leakage amount of the engine is zero at the real-time operating point is selected from the first control response time, and a second control response time for the PM current to reach a preset current from zero when the ammonia leakage amount of the engine is the real-time ammonia leakage amount at the real-time operating point is selected from the second control response time.

[0121] In one possible implementation, when adjusting the engine operating point to a plurality of different operating points by the controller, the response time correction coefficient determination module is configured to:

[0122] The engine's SCR downstream temperature and exhaust gas flow rate are adjusted to multiple different values ​​by a controller;

[0123] Any SCR downstream temperature among the multiple different SCR downstream temperature values ​​and any exhaust gas flow rate among the multiple exhaust gas flow rate values ​​are matched as an operating point to obtain multiple different operating points.

[0124] In one possible implementation, the response time correction coefficient determination module is configured to obtain the response time correction coefficient corresponding to the real-time ammonia leakage amount according to the first control response time and the second control response time corresponding to the real-time ammonia leakage amount using the following response time correction coefficient determination formula:

[0125] f=t a / t b

[0126] Among them, t a represents the first control response time, t b represents the second control response time corresponding to the real-time ammonia leakage amount, and f represents the response time correction coefficient corresponding to the real-time ammonia leakage amount.

[0127] In a possible implementation, the response time correction module is configured to use the following correction response time determination formula to correct the real-time response time according to the response time correction coefficient to obtain a correction response time corresponding to the real-time ammonia leakage amount:

[0128] T2=T1*f

[0129] Wherein, T1 represents the real-time response time, T2 represents the corrected response time corresponding to the real-time ammonia leakage amount, and f represents the response time correction coefficient.

[0130] Refer to the following Figure 7 The electronic device 130 according to this embodiment of the present application is described. Figure 7The electronic device 130 shown is merely an example and should not limit the functions and scope of use of the embodiments of the present application.

[0131] like Figure 7 As shown, the electronic device 130 is a general electronic device. Components of the electronic device 130 may include, but are not limited to, the at least one processor 131, the at least one memory 132, and a bus 133 connecting different system components (including the memory 132 and the processor 131).

[0132] Bus 133 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, and a processor or local bus using any of a variety of bus architectures.

[0133] The memory 132 may include a readable medium in the form of a volatile memory, such as a random access memory (RAM) 1321 and / or a cache memory 1322 , and may further include a read-only memory (ROM) 1323 .

[0134] The memory 132 may also include a program / utility 1325 having a set (at least one) of program modules 1324, such program modules 1324 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment.

[0135] The electronic device 130 may also communicate with one or more external devices 134 (e.g., a keyboard, pointing device, etc.), one or more devices that enable a user to interact with the electronic device 130, and / or any device that enables the electronic device 130 to communicate with one or more other electronic devices (e.g., a router, a modem, etc.). Such communication may occur via an input / output (I / O) interface 135. Furthermore, the electronic device 130 may also communicate with one or more networks (e.g., a local area network (LAN), a wide area network (WAN), and / or a public network such as the Internet) via a network adapter 136. As shown, the network adapter 136 communicates with other modules of the electronic device 130 via a bus 133. It should be understood that, although not shown, other hardware and / or software modules may be used in conjunction with the electronic device 130, including but not limited to microcode, device drivers, redundant processors, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0136] In an exemplary embodiment, the present application further provides a computer-readable storage medium including instructions, such as memory 132 including instructions. The instructions may be executed by processor 131 of electronic device 130 to implement the above-described method for correcting the response time of a particulate matter sensor. Alternatively, the computer-readable storage medium may be a non-transitory computer-readable storage medium, such as a ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, or optical data storage device.

[0137] In an exemplary embodiment, a computer program product is further provided, including a computer program. When the computer program is executed by the processor 131 , the method for correcting the response time of a particulate matter sensor as provided in the present application is implemented.

[0138] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0139] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0140] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0141] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 The steps for the function specified in one or more boxes.

[0142] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A method for correcting the response time of a particulate matter sensor, characterized in that: Applied to an engine exhaust system, the method comprises: When it is determined that the current of the particulate matter sensor reaches the current limit, obtaining the real-time ammonia leakage amount of the engine at the current real-time operating point and the real-time response time of the current of the particulate matter sensor from zero to the current limit; Based on a predetermined first control response time for the current of the particulate matter sensor to reach a preset current from zero when the ammonia leakage amount of the engine is zero at the real-time operating point, and a second control response time for the current of the particulate matter sensor to reach a preset current at different ammonia leakage amounts of the engine at the real-time operating point, a response time correction coefficient corresponding to the real-time ammonia leakage amount is obtained according to the first control response time and the second control response time corresponding to the real-time ammonia leakage amount; The real-time response time is corrected according to the response time correction coefficient to obtain a corrected response time corresponding to the real-time ammonia leakage amount.

2. The method according to claim 1, characterized in that The obtaining of the real-time ammonia leakage of the engine at the current real-time operating point includes: Obtaining the actual urea injection amount and ammonia recovery amount of the selective catalytic reduction device at the current real-time operating point; Obtaining a difference in nitrogen oxides upstream and downstream of the selective catalytic reduction device at a current real-time operating point, and obtaining an ammonia reaction amount based on the difference; The real-time ammonia leakage amount of the engine at the current real-time operating point is obtained according to the actual urea injection amount, the ammonia recovery amount and the ammonia reaction amount.

3. The method according to claim 1, characterized in that The predetermined first control response time for the current of the particulate matter sensor to reach a preset current from zero when the ammonia leakage amount of the engine is zero at the real-time operating point, and the predetermined second control response time for the current of the particulate matter sensor to reach a preset current from zero at different ammonia leakage amounts of the engine at the real-time operating point, include: The engine operating point is adjusted to a plurality of different operating points by a controller, and the actual urea injection amount of the selective catalytic reduction device is adjusted so that the ammonia leakage amount of the engine is different values; determining a first control response time for the current of the particulate matter sensor to reach a preset current from zero when the ammonia leakage amount of the engine is zero at different operating points, and a second control response time for the current of the particulate matter sensor to reach a preset current from zero at different ammonia leakage amounts of the engine at different operating points; A first control response time for the current of the particulate matter sensor to reach a preset current from zero when the ammonia leakage amount of the engine is zero at the real-time operating point is selected from the first control response time, and a second control response time for the current of the particulate matter sensor to reach a preset current from zero when the ammonia leakage amount of the engine is the real-time ammonia leakage amount at the real-time operating point is selected from the second control response time.

4. The method according to claim 3, characterized in that The controller adjusts the engine operating point to a plurality of different operating points, including: The engine's SCR downstream temperature and exhaust gas flow rate are adjusted to multiple different values ​​by a controller; Any SCR downstream temperature from a plurality of different SCR downstream temperature values ​​and any exhaust gas flow rate from a plurality of exhaust gas flow rate values ​​are matched as an operating point to obtain a plurality of different operating points.

5. The method according to claim 1, wherein The response time correction coefficient corresponding to the real-time ammonia leakage amount is obtained by using the following response time correction coefficient determination formula based on the first control response time and the second control response time corresponding to the real-time ammonia leakage amount: f=t a / t b Among them, t a represents the first control response time, t b represents the second control response time corresponding to the real-time ammonia leakage amount, and f represents the response time correction coefficient corresponding to the real-time ammonia leakage amount.

6. The method according to claim 1, characterized in that The following corrected response time determination formula is used to correct the real-time response time according to the response time correction coefficient to obtain the corrected response time corresponding to the real-time ammonia leakage amount: T2=T1*f Wherein, T1 represents the real-time response time, T2 represents the corrected response time corresponding to the real-time ammonia leakage amount, and f represents the response time correction coefficient.

7. A device for correcting the response time of a particle sensor, characterized in that: Applied to an engine exhaust system, the device comprises: a real-time data acquisition module configured to, when determining that the current of the particulate matter sensor reaches the current limit, acquire the real-time ammonia leakage amount of the engine at the current real-time operating point and the real-time response time for the current of the particulate matter sensor to reach the current limit from zero; a response time correction coefficient determination module configured to determine, based on a predetermined first control response time for the current of the particulate matter sensor to reach a preset current from zero when the ammonia leakage amount of the engine is zero at a real-time operating point, and a predetermined second control response time for the current of the particulate matter sensor to reach a preset current at different ammonia leakage amounts of the engine at the real-time operating point, the response time correction coefficient corresponding to the real-time ammonia leakage amount according to the first control response time; The response time correction module is configured to correct the real-time response time according to the response time correction coefficient to obtain a corrected response time corresponding to the real-time ammonia leakage amount.

8. An electronic device, characterized in that: include: processor and memory; The memory is used to store the processor executable instructions; The processor is configured to execute the instructions to implement the method for correcting the response time of a particle matter sensor according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that When the instructions in the computer-readable storage medium are executed by a processor of an electronic device, the electronic device is enabled to perform the method for correcting the response time of a particle matter sensor according to any one of claims 1 to 6.

10. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the method for correcting the response time of a particulate matter sensor according to any one of claims 1 to 6 is implemented.

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