CN116577251A - Correction method, device and equipment for response time of particulate matter sensor - Google Patents

Abstract

This application discloses a method, device and equipment for correcting the response time of a particulate matter sensor, which is used to solve the problem that the current of the particulate matter sensor increases due to the high leakage of ammonia in the related art, which affects the monitoring of the particle capture efficiency of the DPF based on the PM sensor. problem of accuracy. In the embodiment of the present application, when it is determined that the current of the PM particle sensor reaches the current limit value, the real-time ammonia leakage of the engine under the current real-time operating point and the real-time response time for the PM current to reach the current limit value from zero are obtained. The comparison experiment of the PM current from zero to the preset current when the ammonia leakage of the engine at the real-time operating point is different values, the response time correction coefficient corresponding to the real-time ammonia leakage is obtained, and finally, the response time correction coefficient is used to adjust the real-time response time to correct. The influence of ammonia leakage on the accuracy of monitoring the particle trapping efficiency of the DPF is avoided.

Description

Correction method, device and equipment for particle sensor response time

technical field

The present application relates to the technical field of automotive sensors, in particular to a method, device and equipment for correcting the response time of a particle sensor.

Background technique

At present, in the related art, the PM (Particulate Matter, particle) sensor is installed at the end of the aftertreatment part of the engine. When the exhaust gas of the engine passes through the PM sensor, the soot and other particles in the exhaust gas will be adsorbed on the electrodes on the surface of the PM sensor. The particulate matter is constantly increasing, and an electric current is generated between the two electrodes. When the collection efficiency of DPF (Diesel Particulate Filter, particulate matter trap) decreases, the particles leaking to the downstream of SCR (Selective Catalytic Reduction, Selective Catalytic Reduction) increase, so that the carbon load on the PM sensor will gradually increase, resulting in The current between the electrodes on the PM sensor becomes larger, and when the response time when the current value exceeds the current error limit is less than the specified response time, it is considered that the DPF has failed.

For an engine equipped with a PM sensor, when the amount of ammonia leakage is high, the leaked ammonia and water form ammonia water, which causes the current measured by the PM sensor to be too large, so the response time for the PM sensor current to reach the current error limit is shortened, and ammonia leakage The higher the amount, the larger the current of the PM sensor will cause the PM sensor to wrongly determine that the DPF is invalid, which will affect the accuracy of monitoring the particle capture efficiency of the DPF based on the PM sensor.

Contents of the invention

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

In a first aspect, the present application provides a method for correcting the response time of a particle sensor, which is applied to an engine exhaust system, and the method includes:

When it is determined that the current of the PM particle sensor reaches the current limit, obtain the real-time ammonia leakage of the engine under the current real-time operating point and the real-time response time for the PM current to reach the current limit from zero;

Based on pre-determining the first control response time of the PM current from zero to the preset current when the ammonia leakage of the engine at the real-time operating point is zero, and the current of the PM under different ammonia leakage of the engine at the real-time operating point From zero to the second control response time of the preset current, according to the first control response time and the second control response time corresponding to the real-time ammonia leakage, the response time correction coefficient corresponding to the real-time ammonia leakage is obtained;

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.

In a possible implementation manner, the obtaining the real-time ammonia leakage amount of the engine under the current real-time working condition includes:

Obtain the actual urea injection volume and ammonia recovery volume of the selective catalytic reduction device at the current real-time operating point;

Obtain the difference between the upstream and downstream nitrogen oxides of the selective catalytic reduction device at the current real-time operating point, and obtain the ammonia reaction amount according to the difference;

According to the actual urea injection amount, the ammonia recovery amount and the ammonia reaction amount, the real-time ammonia leakage amount of the engine at the current real-time working condition point is obtained.

In a possible implementation manner, when the ammonia leakage of the engine at the real-time operating point is predetermined to be zero, the PM current reaches the first control response time from zero to the preset current, and at the real-time operating point The second control response time of the PM current from zero to the preset current under different ammonia leakage amounts of the engine includes:

Adjust the operating point of the engine to multiple different operating points through the controller, and adjust the actual urea injection amount of the selective catalytic reduction device to make the ammonia leakage of the engine be different values;

Determine the first control response time for the PM current to reach the preset current from zero when the ammonia leakage of the engine at different operating points is zero, and the current of the PM changes from zero to zero under different ammonia leakage of the engine at different operating points Response time of the second control to reach the preset current;

Select the first control response time when the ammonia leakage of the engine at the real-time operating point is zero when the current of the PM reaches the preset current from zero to the first control response time from the first control response time, and select from the second control response time Select the second control response time for the current of the PM to reach the preset current from zero when the ammonia leakage amount of the engine at the real-time operating point is the real-time ammonia leakage amount.

In a possible implementation manner, the adjusting the operating point of the engine to a plurality of different operating points through the controller includes:

Adjust the engine's SCR downstream temperature and exhaust gas flow to a number of different values through the controller;

Match any SCR downstream temperature among the multiple different SCR downstream temperature values with any exhaust gas flow among the multiple exhaust gas flow values to form a working point to obtain multiple different working points.

In a possible implementation, the following response time correction coefficient determination formula is used to obtain the response corresponding to the real-time ammonia leakage according to the first control response time and the second control response time corresponding to the real-time ammonia leakage Time Correction Factor:

f=t _a /t _b

Wherein, t _a represents the response time of the first control, t _b represents the response time of the second control corresponding to the real-time ammonia leakage, and f represents the response time correction factor corresponding to the real-time ammonia leakage.

In a possible implementation, the following correction 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:

T ₂ =T ₁ *f

Wherein, _T1 represents the real-time response time, _T2 represents the corrected response time corresponding to the real-time ammonia leakage, and f represents the response time correction factor.

In a second aspect, the present application provides a device for correcting the response time of a particle sensor, which is applied to an engine exhaust system, and the device includes:

The real-time data acquisition module is configured to obtain the real-time ammonia leakage of the engine under the current real-time working condition point and the real-time response time when the PM current reaches the current limit from zero when the current of the PM particle sensor reaches the current limit;

The response time correction factor determination module is configured to be based on the first comparison response time when the ammonia leakage of the engine at the real-time operating point is determined to be zero when the PM current reaches the preset current from zero, and at the real-time operating point The current of the PM under different ammonia leakage amounts of the engine reaches the second control response time of the preset current from zero, 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 correction factor corresponding to ammonia leakage;

The response time correction module is configured 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.

In a possible implementation manner, the acquisition of the real-time ammonia leakage of the engine at the current real-time operating point is performed, and the real-time data acquisition module is configured to:

Obtain the actual urea injection volume and ammonia recovery volume of the selective catalytic reduction device at the current real-time operating point;

Obtain the difference between the upstream and downstream nitrogen oxides of the selective catalytic reduction device at the current real-time operating point, and obtain the ammonia reaction amount according to the difference;

According to the actual urea injection amount, the ammonia recovery amount and the ammonia reaction amount, the real-time ammonia leakage amount of the engine at the current real-time working condition point is obtained.

In a possible implementation manner, the first control response time for the PM current to reach the preset current from zero when the ammonia leakage of the engine at the real-time operating point is predetermined is determined to be zero, and at the real-time operating point The current of the PM under different ammonia leakage amounts of the lower engine reaches the second control response time from zero to the preset current, and the response time correction coefficient determination module is configured as:

Adjust the operating point of the engine to multiple different operating points through the controller, and adjust the actual urea injection amount of the selective catalytic reduction device to make the ammonia leakage of the engine be different values;

Determine the first control response time for the PM current to reach the preset current from zero when the ammonia leakage of the engine at different operating points is zero, and the current of the PM changes from zero to zero under different ammonia leakage of the engine at different operating points Response time of the second control to reach the preset current;

Select the first control response time when the ammonia leakage of the engine at the real-time operating point is zero when the current of the PM reaches the preset current from zero to the first control response time from the first control response time, and select from the second control response time Select the second control response time for the current of the PM to reach the preset current from zero when the ammonia leakage amount of the engine at the real-time operating point is the real-time ammonia leakage amount.

In a possible implementation manner, the controller is used to adjust the operating point of the engine to multiple different operating points, and the response time correction coefficient determination module is configured to:

Adjust the engine's SCR downstream temperature and exhaust gas flow to a number of different values through the controller;

Match any SCR downstream temperature among the multiple different SCR downstream temperature values with any exhaust gas flow among the multiple exhaust gas flow values to form a working point to obtain multiple different working points.

In a possible implementation, the response time correction coefficient determination module is configured to use 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 , to obtain the response time correction coefficient corresponding to the real-time ammonia leakage:

f=t _a /t _b

Wherein, t _a represents the response time of the first control, t _b represents the response time of the second control corresponding to the real-time ammonia leakage, and f represents the response time correction factor corresponding to the real-time ammonia leakage.

In a possible implementation manner, 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 the real-time ammonia leakage corresponding to Corrected response time:

T ₂ =T ₁ *f

Wherein, _T1 represents the real-time response time, _T2 represents the corrected response time corresponding to the real-time ammonia leakage, and f represents the response time correction factor.

In a third aspect, the present application provides an electronic device, including:

processor and memory;

the memory for storing the processor-executable instructions;

The processor is configured to execute the instructions to implement the method for correcting the response time of the particle sensor according to any one of the above first aspects.

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 is able to execute any one of the above-mentioned first aspects. Correction method for the response time of the particle sensor.

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

When the computer program is executed by the processor, the method for correcting the response time of the particle sensor according to any one of the above first aspects is implemented.

The technical solutions provided by the embodiments of the present application bring at least the following beneficial effects:

In the embodiment of the present application, when it is determined that the current of the PM particle sensor reaches the current limit value, the real-time ammonia leakage of the engine under the current real-time operating point and the real-time response time for the PM current to reach the current limit value from zero are obtained, and the The comparison experiment of the PM current from zero to the preset current when the ammonia leakage of the engine under the current real-time working condition point is different values, and the response time correction coefficient corresponding to the real-time ammonia leakage is obtained. Finally, the response time correction coefficient is used to adjust the real-time Response time is corrected. To sum up, the embodiment of the present application considers the influence of the ammonia leakage of the engine exhaust on the current of the PM sensor, and adds a step of correcting the response time of the particulate matter sensor based on the ammonia leakage, so as to avoid the influence of the ammonia leakage on the DPF. The impact on the accuracy of monitoring the particle capture efficiency, thereby ensuring the monitoring accuracy of the particle capture efficiency of the DPF.

Additional features and advantages of the application will be set forth in the description which follows, and, in part, will be obvious from the description, or may be learned by practice of the application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the accompanying drawings that need to be used in the embodiments of the present application. Obviously, the accompanying drawings described below are only some embodiments of the present application. Those of ordinary skill in the art can also obtain other drawings based on these drawings without making creative efforts.

FIG. 1 is a schematic structural diagram of an engine exhaust system provided by an embodiment of the present application;

FIG. 2 is a schematic diagram of the overall flow of the method for correcting the response time of the particulate matter sensor provided in the embodiment of the present application;

Fig. 3 is a schematic flow chart for obtaining the real-time ammonia leakage of the engine under the current real-time working condition point provided by the embodiment of the present application;

FIG. 4 is a schematic flowchart of step 202 provided by the embodiment of the present application;

FIG. 5 is a schematic flow diagram of adjusting the operating point of the engine to a plurality of different operating points through the controller in step 401 provided by the embodiment of the present application;

FIG. 6 is a schematic structural diagram of a correction device for a response time of a particle sensor provided in an embodiment of the present application;

FIG. 7 is a schematic structural diagram of an electronic device provided by an embodiment of the present application.

Detailed ways

In order 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. Wherein, the described embodiments are some of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

Moreover, in the description of the embodiments of the present application, unless otherwise specified, "/" means or means, for example, A/B can mean A or B; "and/or" in the text is only a description of associated objects The association relationship indicates that there may be three kinds of relationships, for example, A and/or B, which may indicate: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiment of the present application , "plurality" means two or more than two.

Hereinafter, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as implying or implying relative importance or implicitly specifying the quantity of indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the embodiments of the present application, unless otherwise specified, "multiple" means two or more.

The relevant terms or devices involved in the embodiments of the present application are explained below:

Particulate matter sensor (Particulate Matter, PM): Installed in the engine exhaust system, the sensor that converts the concentration of particulate matter into a current value to monitor the conversion efficiency of the DPF. The particle sensor is mainly composed of a sensor probe, a wiring harness and a control unit. The connector of the probe and the control unit are not detachable.

Oxidation Catalysis (Diesel Oxidation Catalysis, DOC): Particulate oxidation catalytic technology is to coat noble metal catalysts (such as Pt, etc.) Activation energy enables these substances to undergo an oxidation reaction with oxygen in the tail gas at a lower temperature and finally convert into CO2 and H2O. Oxidation catalytic converter does not need regeneration system and control device, has the characteristics of simple structure and good reliability, and has been applied in modern small engines.

Diesel Particulate Filter (DPF): A particulate filter installed in the engine exhaust system with a porous carrier medium as the filter element. The particulate capture technology mainly filters and captures particulates in engine exhaust through diffusion, deposition and impact mechanisms. When the exhaust gas flows through the trap, the particles are trapped in the filter element of the filter body, and the cleaner exhaust gas is discharged into the atmosphere. At present, the wall-flow honeycomb ceramic filter is widely used, which is mainly used in construction machinery and city buses. It is characterized by simple operation and high filtration efficiency, but there are regeneration of the filter and sensitivity to the sulfur content in the fuel. question.

Selective Catalytic Reduction (SCR): Selective Catalytic Reduction technology is used in diesel engine aftertreatment applications to reduce the content of nitrogen oxides (NOx) in engine exhaust. Nitrogen oxides are one of the main harmful components of diesel engine exhaust. The working principle of SCR is to inject a reducing agent into the exhaust pipe. Under the catalytic action of the catalyst, the reducing agent reacts with the nitrogen oxides in the exhaust gas, thereby reducing The purpose of NOx concentration.

The reducing agent currently used in SCR is ammonia (NH3). In practical application, for the convenience of storage and transportation, the vehicle is loaded with urea (NH2CONH2) aqueous solution (urea or Adblue, i.e. 32.5% urea aqueous solution). Urea is preheated in the tail gas pipeline and undergoes hydrolysis to generate ammonia and water; ammonia and nitrogen oxides (mainly NO and NO2) in the tail gas undergo a reduction reaction to generate nitrogen and water.

Ammonia slip catalyst (ASC).

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 non-combustible component. The non-combustible component will always accumulate in the DPF. When it reaches a certain After the accumulation, it needs to be cleaned manually.

Figure 3 is a schematic diagram of the engine exhaust system architecture, where the engine, DOC, DPF, SCR, ASC and PM sensors are connected in sequence. In the related technology, the PM sensor is installed at the end of the engine exhaust system. When the exhaust gas of the engine passes through the PM sensor, the soot and other particulate matter in the exhaust gas will be adsorbed on the electrodes on the surface of the sensor. As the adsorbed particulate matter continues to increase, the two electrodes A current is generated between them.

When the collection efficiency of the DPF decreases, the carbon load leaked to the PM sensor downstream of the SCR will gradually increase, resulting in an increase in the current between the electrodes on the sensor. When the current value exceeds the current error limit, the response time is less than the specified When the response time is less than the response time, it is considered that the DPF fails.

For an engine equipped with a PM sensor, when the amount of ammonia leakage is high, the leaked ammonia and water form ammonia water, which causes the current measured by the PM sensor to be too large, so the response time for the PM sensor current to reach the current error limit is shortened, and ammonia leakage The higher the amount, the larger the current of the PM sensor will cause the PM sensor to wrongly determine that the DPF is invalid, which will affect the accuracy of monitoring the particle capture efficiency of the DPF based on the PM sensor.

In view of this, the present application provides a method, device and equipment for correcting the response time of the particulate matter sensor to solve the problem that the current of the particulate matter sensor increases due to the high leakage of ammonia in the related art, which affects the particle capture of the DPF based on the PM sensor. The accuracy of monitoring set efficiency.

The inventive concept of the present application can be summarized as: when the current of the PM particle sensor reaches the current limit value, obtain the real-time ammonia leakage of the engine under the current real-time working condition point and the real-time response time for the PM current to reach the current limit value from zero, through Under the same current real-time working condition point, when the ammonia leakage of the engine is at different values, the PM current is compared from zero to the preset current, and the response time correction coefficient corresponding to the real-time ammonia leakage is obtained. Finally, the response time correction is adopted The coefficient corrects for the real-time response time. To sum up, the embodiment of the present application considers the influence of the ammonia leakage of the engine exhaust on the current of the PM sensor, and adds a step of correcting the response time of the particulate matter sensor based on the ammonia leakage, so as to avoid the influence of the ammonia leakage on the DPF. The impact on the accuracy of monitoring the particle capture efficiency, thereby ensuring the monitoring accuracy of the particle capture efficiency of the DPF.

After introducing the main inventive ideas of the embodiments of the present application, the following briefly introduces the applicable application scenarios of the technical solutions of the embodiments of the present application. It should be noted that the application scenarios introduced below are only used to illustrate the embodiments of the present application Unlimited. During specific implementation, the technical solutions provided by the embodiments of the present application may be flexibly applied according to actual needs.

In order to facilitate understanding of the method for correcting the response time of the particulate matter sensor provided in the embodiment of the present application, it will be further described below with reference to the accompanying drawings.

In a possible implementation, the present application provides a method for correcting the response time of the particle sensor, which is applied to the engine exhaust system as shown in Figure 1, and its overall process is shown in Figure 2, including the following:

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 at the current real-time operating point and the real-time response time for the PM current to reach the current limit from zero are acquired.

In a possible implementation, the process of obtaining the real-time ammonia leakage of the engine under the current real-time working condition in this application is shown in Figure 3, which can be implemented as the following steps:

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

In step 302, the difference between the upstream and downstream nitrogen oxides of the selective catalytic reduction device at the current real-time operating point is obtained, and the ammonia reaction amount is obtained according to the difference.

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

For example, the temperature downstream of the SCR at the current real-time operating point is 250°C, the exhaust gas flow rate is 300 ³ /h, and the actual urea injection amount of the selective catalytic reduction device is a. Ammonia will be recovered, and the amount of ammonia recovered through the sensor is b. This application can also obtain the difference between the upstream and downstream nitrogen oxides of the selective catalytic reduction device. According to the chemical equation of the reaction between nitrogen oxides and ammonia and the nitrogen oxides The difference (that is, the amount involved in the chemical reaction), the ammonia reaction amount is c, and according to 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 obtained as d, then d=abc.

In a possible implementation manner, in the embodiment of the present application, the PM sensor directly reads the real-time response time when the current of the PM reaches the current limit from zero.

In step 202, based on predetermining that the ammonia leakage of the engine at the real-time operating point is zero, the current of the PM reaches the first control response time from zero to the preset current, and the different ammonia leakage of the engine at the real-time operating point According to the second control response time for the PM current from zero to the preset current, according to the first control response time and the second control response time corresponding to the real-time ammonia leakage, the response time correction coefficient corresponding to the real-time ammonia leakage is obtained.

In a possible implementation, the embodiment of the present application predetermines the first control response time when the ammonia leakage of the engine at the real-time operating point is zero when the ammonia leakage of the engine reaches the preset current from zero at the real-time operating point, and at The second control response time for the current of PM to reach the preset current from zero under different ammonia leakage amounts of the engine under the real-time working condition point, the specific flow diagram is shown in Figure 4, including the following:

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

In a possible implementation, in order to enable the data of the comparative experiment to cover more operating point ranges, in step 401, the controller adjusts the operating point of the engine to a plurality of different operating points, as shown in Figure 5 display, including the following:

In step 501, the engine's SCR downstream temperature and exhaust gas flow are adjusted to a plurality of different values by a controller.

In step 502, any SCR downstream temperature among multiple different SCR downstream temperature values and any exhaust gas flow among multiple exhaust gas flow values are matched as one operating point, and multiple different operating points are obtained.

For example, the SCR downstream temperature of the engine can be adjusted to 250°C and 350°C, the exhaust gas flow rate can be adjusted to 300 ³ /h and 60m ³ /h, any one of the multiple different SCR downstream temperature values and the multiple Any exhaust gas flow rate in the exhaust gas flow value is matched as a working point, that is, the embodiment of the present application can match the two values of the downstream temperature of the SCR with the two values of the exhaust gas flow rate one by one, for example, the temperature downstream of the SCR is 250°C and the exhaust gas flow rate is 250°C. The flow rate is 300 ³ /h as a working point, the temperature downstream of the SCR is 250°C and the exhaust gas flow rate is 60m ³ /h as a working point, and so on, to get 4 different working points for real-time working conditions Click to match.

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: when the actual urea injection amount of the selective catalytic reduction device is 0, the actual urea injection amount is too high. When spraying 1.5 times the amount of ammonia leakage is x and when the actual urea injection amount is oversprayed by 2 times, the amount of ammonia leakage is y, and so on, the application realizes the ammonia leakage amount of the engine by adjusting the actual urea injection amount of the selective catalytic reduction device. The adjustment provides preparatory conditions for the completion of the comparative experiment and provides more control data for the comparative experiment.

In the embodiment of the present application, after obtaining a plurality of different working condition points in the comparison experiment and adjusting the ammonia leakage of the engine to a plurality of different values, in step 402, it is determined that the ammonia leakage of the engine is zero at different working condition points The first comparative response time for the PM current to reach the preset current from zero, and the second comparative response time for the PM current to reach the preset current from zero under different ammonia leakage amounts of the engine at different operating points. Step 402 is the step of obtaining a plurality of control response times corresponding to different working conditions and different ammonia leakage amounts through comparative experiments, so as to facilitate the screening in subsequent step 403 to obtain the first control response time and the second control response under real-time working conditions. time.

In step 403, select from the first control response time when the ammonia leakage of the engine under the real-time operating point is zero, and the current of the PM reaches the preset current from zero to the first control response time, and from the second control response time The ammonia leakage of the engine at the real-time operating point is selected as the second control response time for the current of the PM to reach the preset current from zero when the real-time ammonia leakage is selected.

In a possible implementation, after screening the first control response time and the second control response time corresponding to the real-time ammonia leakage in step 403, the following response time correction coefficient determination formula (1) is used to obtain the real-time ammonia leakage Corresponding response time correction factor:

f＝t _a / t _b (1)

Wherein, t _a represents the response time of the first control, t _b represents the response time of the second control corresponding to the real-time ammonia leakage, and f represents the response time correction factor corresponding to the real-time ammonia leakage.

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.

In a possible implementation, the embodiment of the present application adopts 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:

T ₂ =T ₁ *f (2)

Among them, _T1 represents the real-time response time, _T2 represents the corrected response time corresponding to the real-time ammonia leakage, and f represents the response time correction factor.

To sum up, the embodiment of the present application considers the influence of the ammonia leakage of the engine exhaust on the current of the PM sensor, and adds a step of correcting the response time of the particulate matter sensor based on the ammonia leakage, so as to avoid the influence of the ammonia leakage on the DPF. The impact on the accuracy of monitoring the particle capture efficiency, thereby ensuring the monitoring accuracy of the particle capture efficiency of the DPF.

Based on the same inventive concept, this application provides a device for correcting the response time of a particle sensor, which is applied to an engine exhaust system, as shown in FIG. 6 , the device 600 includes:

The real-time data acquisition module 601 is configured to obtain the real-time ammonia leakage of the engine under the current real-time operating point and the real-time response time for the current of the PM to reach the current limit from zero when it is determined that the current of the PM particle sensor reaches the current limit;

The response time correction factor determination module 602 is configured to predetermine the first control response time when the ammonia leakage of the engine at the real-time operating point is zero when the PM current reaches the preset current from zero, and at the real-time operating point The current of the PM under different ammonia leakage amounts of the lower engine reaches the second comparison response time from zero to the preset current, and according to the first comparison response time and the second comparison response time corresponding to the real-time ammonia leakage amount, the described Response time correction factor corresponding to real-time ammonia leakage;

The response time correction module 603 is configured 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.

In a possible implementation manner, the acquisition of the real-time ammonia leakage of the engine at the current real-time operating point is performed, and the real-time data acquisition module is configured to:

Obtain the actual urea injection volume and ammonia recovery volume of the selective catalytic reduction device at the current real-time operating point;

Obtain the difference between the upstream and downstream nitrogen oxides of the selective catalytic reduction device at the current real-time operating point, and obtain the ammonia reaction amount according to the difference;

According to the actual urea injection amount, the ammonia recovery amount and the ammonia reaction amount, the real-time ammonia leakage amount of the engine at the current real-time working condition point is obtained.

In a possible implementation manner, the first control response time for the PM current to reach the preset current from zero when the ammonia leakage of the engine at the real-time operating point is predetermined is determined to be zero, and at the real-time operating point The current of the PM under different ammonia leakage amounts of the lower engine reaches the second control response time from zero to the preset current, and the response time correction coefficient determination module is configured as:

Adjust the operating point of the engine to multiple different operating points through the controller, and adjust the actual urea injection amount of the selective catalytic reduction device to make the ammonia leakage of the engine be different values;

Determine the first control response time for the PM current to reach the preset current from zero when the ammonia leakage of the engine at different operating points is zero, and the current of the PM changes from zero to zero under different ammonia leakage of the engine at different operating points Response time of the second control to reach the preset current;

Select the first control response time when the ammonia leakage of the engine at the real-time operating point is zero when the current of the PM reaches the preset current from zero to the first control response time from the first control response time, and select from the second control response time Select the second control response time for the current of the PM to reach the preset current from zero when the ammonia leakage amount of the engine at the real-time operating point is the real-time ammonia leakage amount.

In a possible implementation manner, the controller is used to adjust the operating point of the engine to multiple different operating points, and the response time correction coefficient determination module is configured to:

Adjust the engine's SCR downstream temperature and exhaust gas flow to a number of different values through the controller;

Match any SCR downstream temperature among the multiple different SCR downstream temperature values with any exhaust gas flow among the multiple exhaust gas flow values to form a working point to obtain multiple different working points.

In a possible implementation, the response time correction coefficient determination module is configured to use 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 , to obtain the response time correction coefficient corresponding to the real-time ammonia leakage:

f=t _a /t _b

Wherein, t _a represents the response time of the first control, t _b represents the response time of the second control corresponding to the real-time ammonia leakage, and f represents the response time correction factor corresponding to the real-time ammonia leakage.

In a possible implementation manner, 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 the real-time ammonia leakage corresponding to Corrected response time:

T ₂ =T ₁ *f

Wherein, _T1 represents the real-time response time, _T2 represents the corrected response time corresponding to the real-time ammonia leakage, and f represents the response time correction factor.

The electronic device 130 according to this embodiment of the present application is described below with reference to FIG. 7 . The electronic device 130 shown in FIG. 7 is only an example, and should not limit the functions and scope of use of this embodiment of the present application.

As shown in FIG. 7, the electronic device 130 is represented in the form of a general electronic device. Components of the electronic device 130 may include, but are not limited to: at least one processor 131 , at least one memory 132 , and a bus 133 connecting different system components (including the memory 132 and the processor 131 ).

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

Memory 132 may include readable media in the form of volatile memory, such as random access memory (RAM) 1321 and/or cache memory 1322 , and may further include read only memory (ROM) 1323 .

Memory 132 may also include programs/utilities 1325 having a set (at least one) of program modules 1324 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, which Each or some combination of the examples may include the implementation of a network environment.

Electronic device 130 may also communicate with one or more external devices 134 (e.g., keyboards, pointing devices, etc.), and may also communicate with one or more devices that enable a user to interact with electronic device 130, and/or communicate with one or more devices that enable the electronic device 130 is capable of communicating with any device (eg, router, modem, etc.) that communicates with one or more other electronic devices. Such communication may occur through input/output (I/O) interface 135 . Moreover, the electronic device 130 can also communicate with one or more networks (such as a local area network (LAN), a wide area network (WAN) and/or a public network such as the Internet) through the network adapter 136 . As shown, network adapter 136 communicates with other modules for electronic device 130 over bus 133 . It should be understood that although not shown, other hardware and/or software modules may be used in conjunction with 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 system, etc.

In an exemplary embodiment, the present application also provides a computer-readable storage medium including instructions, such as a memory 132 including instructions, the instructions can be executed by the processor 131 of the electronic device 130 to complete the above-mentioned correction of the response time of the particle sensor method. Alternatively, the computer-readable storage medium may be a non-transitory computer-readable storage medium, for example, the non-transitory computer-readable storage medium may be ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk and optical data storage devices, etc.

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

Those skilled in the art should understand that the embodiments of the present application may be provided as methods, systems, or computer program products. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to the present application. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a An apparatus for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart or blocks of the flowchart and/or the block or blocks of the block diagrams.

Obviously, those skilled in the art can make various changes and modifications to the application without departing from the spirit and scope of the application. In this way, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these modifications and variations.

Claims (10)

1. A method for correcting the response time of a particle sensor, characterized in that it is applied to an engine exhaust system, and the method comprises: When it is determined that the current of the PM particle sensor reaches the current limit, obtain the real-time ammonia leakage of the engine under the current real-time operating point and the real-time response time for the PM current to reach the current limit from zero; Based on pre-determining the first control response time of the PM current from zero to the preset current when the ammonia leakage of the engine at the real-time operating point is zero, and the current of the PM under different ammonia leakage of the engine at the real-time operating point From zero to the second control response time of the preset current, according to the first control response time and the second control response time corresponding to the real-time ammonia leakage, the response time correction coefficient corresponding to the real-time ammonia leakage is obtained; 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, wherein said acquiring the real-time ammonia leakage of the engine under the current real-time working condition comprises: Obtain the actual urea injection volume and ammonia recovery volume of the selective catalytic reduction device at the current real-time operating point; Obtain the difference between the upstream and downstream nitrogen oxides of the selective catalytic reduction device at the current real-time operating point, and obtain the ammonia reaction amount according to the difference; According to the actual urea injection amount, the ammonia recovery amount and the ammonia reaction amount, the real-time ammonia leakage amount of the engine at the current real-time working condition point is obtained. 3. The method according to claim 1, characterized in that, when the ammonia leakage of the engine is determined to be zero at the real-time operating point, the current of the PM reaches the first control response time of the preset current from zero, and The second control response time for the PM current from zero to the preset current under different ammonia leakage amounts of the engine at the real-time operating point includes: Adjust the operating point of the engine to multiple different operating points through the controller, and adjust the actual urea injection amount of the selective catalytic reduction device to make the ammonia leakage of the engine be different values; Determine the first control response time for the PM current to reach the preset current from zero when the ammonia leakage of the engine at different operating points is zero, and the current of the PM changes from zero to zero under different ammonia leakage of the engine at different operating points Response time of the second control to reach the preset current; Select the first control response time when the ammonia leakage of the engine at the real-time operating point is zero when the current of the PM reaches the preset current from zero to the first control response time from the first control response time, and select from the second control response time Select the second control response time for the current of the PM to reach the preset current from zero when the ammonia leakage amount of the engine at the real-time operating point is the real-time ammonia leakage amount. 4. The method according to claim 3, wherein said adjusting the working point of the engine to a plurality of different working points by the controller comprises: Adjust the engine's SCR downstream temperature and exhaust gas flow to a number of different values through the controller; Match any SCR downstream temperature among the multiple different SCR downstream temperature values with any exhaust gas flow among the multiple exhaust gas flow values to form a working point to obtain multiple different working points. 5. The method according to claim 1, wherein the following response time correction coefficient determination formula is used to obtain the real-time Response time correction factor corresponding to ammonia leakage: f=t _a /t _b Wherein, t _a represents the response time of the first control, t _b represents the response time of the second control corresponding to the real-time ammonia leakage, and f represents the response time correction factor corresponding to the real-time ammonia leakage. 6. The method according to claim 1, wherein the following correction 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 : T ₂ =T ₁ *f Wherein, _T1 represents the real-time response time, _T2 represents the corrected response time corresponding to the real-time ammonia leakage, and f represents the response time correction factor. 7. A correction device for the response time of a particle sensor, characterized in that it is applied to an engine exhaust system, and the device comprises: The real-time data acquisition module is configured to obtain the real-time ammonia leakage of the engine under the current real-time working condition point and the real-time response time when the PM current reaches the current limit from zero when the current of the PM particle sensor reaches the current limit; The response time correction factor determination module is configured to be based on the first comparison response time when the ammonia leakage of the engine at the real-time operating point is determined to be zero when the PM current reaches the preset current from zero, and at the real-time operating point The current of the PM under different ammonia leakage amounts of the engine reaches the second control response time of the preset current from zero, 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 correction factor corresponding to ammonia leakage; The response time correction module is configured 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. 8. An electronic device, characterized in that it comprises: processor and memory; the memory for storing the processor-executable instructions; The processor is configured to execute the instructions to implement the method for correcting the response time of the particle sensor according to any one of claims 1-6. 9. A computer-readable storage medium, characterized in that, when the instructions in the computer-readable storage medium are executed by the processor of the electronic device, the electronic device is able to execute any one of claims 1-6. The correction method for the response time of the particulate matter sensor described in the item. 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 the particle sensor according to any one of claims 1-6 is implemented.