CN116577251B - Correction method, device and equipment for response time of particulate matter sensor - Google Patents
Correction method, device and equipment for response time of particulate matter sensorInfo
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- CN116577251B CN116577251B CN202310363014.9A CN202310363014A CN116577251B CN 116577251 B CN116577251 B CN 116577251B CN 202310363014 A CN202310363014 A CN 202310363014A CN 116577251 B CN116577251 B CN 116577251B
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
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Abstract
本申请公开了一种颗粒物传感器响应时间的修正方法、装置和设备，用以解决相关技术中氨泄漏量较高导致颗粒物传感器的电流变大，影响基于PM传感器对DPF的颗粒捕集效率进行监控的准确性的问题。本申请实施例在确定PM颗粒物传感器的电流到达电流限值时，获取当前实时工况点下发动机的实时氨泄漏量和PM的电流从零到达电流限值的实时响应时间，通过处于相同的当前实时工况点下的发动机的氨泄漏量为不同值时PM的电流从零达到预设电流的对比实验，得到实时氨泄漏量对应的响应时间修正系数，最终，采用响应时间修正系数对实时响应时间进行修正。避免了氨泄漏量对DPF的颗粒捕集效率进行监控的准确性的影响。
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
The application relates to the technical field of automobile sensors, in particular to a method, a device and equipment for correcting response time of a particulate matter sensor.
Background
At present, in the related art, a PM (Particulate Matter, particulate) sensor is installed at the end of an aftertreatment portion of an engine, when exhaust gas of the engine passes through the PM sensor, particulate matters such as soot in the exhaust gas are adsorbed on electrodes on the surface of the PM sensor, and as the adsorbed particulate matters are continuously increased, current is generated between the two electrodes. After the trapping efficiency of the DPF (Diesel Particulate Filter, particulate matter trap) is reduced, the amount of particulates leaked to the downstream of the SCR (SELECTIVE CATALYTIC Reduction ) is increased, so that the carbon load on the PM sensor is gradually increased, the current between the electrodes on the PM sensor is increased, and the DPF is considered to be invalid when the response time when the current value exceeds the current error reporting limit value is smaller than the specified response time.
For the engine with the PM sensor, when the ammonia leakage amount is higher, ammonia and water leaked out form ammonia water, so that the current measured by the PM sensor is larger, the response time for the current of the PM sensor to reach the current error reporting limit value is shortened, the current of the PM sensor is larger due to the higher ammonia leakage amount, so that the PM sensor erroneously determines that the DPF fails, and the accuracy of monitoring the particle trapping efficiency of the DPF based on the PM sensor is influenced.
Disclosure of Invention
The application aims to provide a correction method, device and equipment of response time of a particulate matter sensor, which are used for solving the problems that in the related art, the current of the particulate matter sensor becomes large due to higher ammonia leakage amount, and the accuracy of monitoring the particle trapping efficiency of a DPF based on a PM sensor is affected.
In a first aspect, the present application provides a method for correcting response time of a particulate matter sensor, applied to an engine exhaust system, the method comprising:
when the current of the PM particulate matter sensor reaches a current limit value, acquiring the real-time ammonia leakage quantity of the engine and the real-time response time of the current of PM reaching the current limit value from zero under the current real-time working condition point;
Based on a first comparison response time when the current of PM reaches a preset current from zero when the ammonia leakage amount of the engine is zero at a real-time working point and a second comparison response time when the current of PM reaches the preset current from zero at different ammonia leakage amounts of the engine at the real-time working point, obtaining a response time correction coefficient corresponding to the real-time ammonia leakage amount according to the first comparison response time and the second comparison response time corresponding to the real-time ammonia leakage amount;
And correcting 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 one possible embodiment, the acquiring the real-time ammonia leakage amount of the engine at the current real-time operating point includes:
Acquiring the actual urea injection quantity and ammonia recovery quantity of a selective catalytic reducer at the current real-time working point;
acquiring the difference of nitrogen oxides at the upstream and downstream of a selective catalytic reducer at the current real-time working point, and obtaining ammonia reaction quantity according to the difference;
and obtaining the real-time ammonia leakage quantity of the engine at the current real-time working point according to the actual urea injection quantity, the ammonia recovery quantity and the ammonia reaction quantity.
In one possible implementation, the predetermined first control response time for the PM current to reach the preset current from zero when the engine ammonia leakage amount is zero at the real-time operating point, and the predetermined second control response time for the PM current to reach the preset current from zero at the different engine ammonia leakage amounts at the real-time operating point include:
adjusting the working condition point of the engine into a plurality of different working condition points through the controller, and adjusting the actual urea injection quantity of the selective catalytic reducer to enable the ammonia leakage quantity of the engine to be different values;
Determining a first comparison response time when the current of PM reaches a preset current from zero when the ammonia leakage amount of the engine is zero at different working points, and a second comparison response time when the current of PM reaches the preset current from zero at different ammonia leakage amounts of the engine at different working points;
And selecting a first comparison response time from the first comparison response time when the current of PM reaches a preset current from zero when the ammonia leakage amount of the engine is zero at the real-time working point, and selecting a second comparison response time from the second comparison response time when the current of PM reaches the preset current from zero when the ammonia leakage amount of the engine is real-time ammonia leakage amount at the real-time working point.
In one possible embodiment, the adjusting, by the controller, the operating point of the engine to a plurality of different operating points includes:
adjusting, by a controller, an SCR downstream temperature of the engine and an exhaust gas flow to a plurality of different values;
and matching any one of the plurality of different SCR downstream temperature values with any one of the plurality of exhaust flow values to form a working point, so as to obtain a plurality of different working points.
In one possible implementation, the following response time correction coefficient determination formula is used to obtain the response time correction coefficient 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:
f=ta/tb
wherein 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.
In one possible implementation manner, the following correction response time determination formula is adopted to correct the real-time response time according to the response time correction coefficient, so as to obtain the correction response time corresponding to the real-time ammonia leakage amount:
T2＝T1*f
Wherein T 1 represents the real-time response time, T 2 represents the corrected response time corresponding to the real-time ammonia leakage amount, and f represents the response time correction coefficient.
In a second aspect, the present application provides a device for correcting response time of a particulate matter sensor, applied to an engine exhaust system, the device comprising:
The real-time data acquisition module is configured to acquire real-time ammonia leakage quantity of the engine and real-time response time of the current of PM reaching a current limit value from zero under the current real-time working condition point when the current of the PM particulate matter sensor reaches the current limit value;
The response time correction coefficient determining module is configured to obtain a response time correction coefficient corresponding to the real-time ammonia leakage amount according to a first comparison response time when the current of PM reaches a preset current from zero when the ammonia leakage amount of the engine is zero at a real-time working point and a second comparison response time when the current of PM reaches the preset current from zero at different ammonia leakage amounts of the engine at the real-time working point;
And 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 one possible embodiment, the acquiring the real-time ammonia leakage amount of the engine at the current real-time operating point is performed, and the real-time data acquisition module is configured to:
Acquiring the actual urea injection quantity and ammonia recovery quantity of a selective catalytic reducer at the current real-time working point;
acquiring the difference of nitrogen oxides at the upstream and downstream of a selective catalytic reducer at the current real-time working point, and obtaining ammonia reaction quantity according to the difference;
and obtaining the real-time ammonia leakage quantity of the engine at the current real-time working point according to the actual urea injection quantity, the ammonia recovery quantity and the ammonia reaction quantity.
In one possible embodiment, the first control response time of the predetermined PM current from zero to a preset current when the engine ammonia leakage amount is zero at the real-time operating point and the second control response time of the PM current from zero to a preset current at different engine ammonia leakage amounts at the real-time operating point are performed, and the response time correction factor determining module is configured to:
adjusting the working condition point of the engine into a plurality of different working condition points through the controller, and adjusting the actual urea injection quantity of the selective catalytic reducer to enable the ammonia leakage quantity of the engine to be different values;
Determining a first comparison response time when the current of PM reaches a preset current from zero when the ammonia leakage amount of the engine is zero at different working points, and a second comparison response time when the current of PM reaches the preset current from zero at different ammonia leakage amounts of the engine at different working points;
And selecting a first comparison response time from the first comparison response time when the current of PM reaches a preset current from zero when the ammonia leakage amount of the engine is zero at the real-time working point, and selecting a second comparison response time from the second comparison response time when the current of PM reaches the preset current from zero when the ammonia leakage amount of the engine is real-time ammonia leakage amount at the real-time working point.
In one possible implementation, the adjusting, by the controller, the operating point of the engine to a plurality of different operating points is performed, and the response time correction factor determination module is configured to:
adjusting, by a controller, an SCR downstream temperature of the engine and an exhaust gas flow to a plurality of different values;
and matching any one of the plurality of different SCR downstream temperature values with any one of the plurality of exhaust flow values to form a working point, so as to obtain a plurality of different working points.
In one possible implementation, the response time correction factor determination module is configured to obtain the response time correction factor corresponding to the real-time ammonia leakage amount from 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 factor determination formula:
f=ta/tb
wherein 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.
In one possible implementation, the response time correction module is configured to correct the real-time response time according to the response time correction coefficient using the following correction response time determination formula, to obtain a corrected response time corresponding to the real-time ammonia leakage amount:
T2＝T1*f
Wherein T 1 represents the real-time response time, T 2 represents the corrected response time corresponding to the real-time ammonia leakage amount, and f represents the response time correction coefficient.
In a third aspect, the present application provides an electronic device comprising:
a processor and a memory;
The memory is configured to store the processor-executable instructions;
The processor is configured to execute the instructions to implement a method of modifying a response time of a particulate matter sensor as described in any one of the first aspects above.
In a fourth aspect, the present application provides a computer readable storage medium, which when executed by an electronic device, causes the electronic device to perform a method of correcting a response time of a particulate matter sensor as in any one of the first aspects above.
In a fifth aspect, the application provides a computer program product comprising a computer program:
The computer program, when executed by a processor, implements a method of correcting a response time of a particulate matter sensor as defined in any one of the first aspects above.
The technical scheme provided by the embodiment of the application at least has the following beneficial effects:
In the embodiment of the application, when the current of the PM particulate matter sensor reaches the current limit value, the real-time ammonia leakage quantity of the engine and the real-time response time of the current of PM reaching the current limit value from zero under the current real-time working condition point are obtained, and the response time correction coefficient corresponding to the real-time ammonia leakage quantity is obtained through the comparison experiment that the current of PM reaches the preset current from zero when the ammonia leakage quantity of the engine under the same current real-time working condition point is different values, and finally, the real-time response time is corrected by adopting the response time correction coefficient. In summary, the embodiment of the application considers the influence of the ammonia leakage amount of the engine tail exhaust on the current of the PM sensor, increases the step of correcting the response time of the particulate matter sensor based on the ammonia leakage amount, and avoids the influence of the ammonia leakage amount on the accuracy of monitoring the particulate trapping efficiency of the DPF, thereby ensuring the accuracy of monitoring the particulate trapping 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 will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an engine exhaust system according to an embodiment of the present disclosure;
FIG. 2 is a schematic overall flow chart of a method for correcting response time of a particulate matter sensor according to an embodiment of the present application;
FIG. 3 is a schematic flow chart of obtaining real-time ammonia leakage of an engine at a current real-time operating point according to an embodiment of the present application;
FIG. 4 is a flowchart of step 202 according to an embodiment of the present application;
FIG. 5 is a schematic flow chart of adjusting an operating point of an engine to a plurality of different operating points by a controller in step 401 according to an embodiment of the present application;
FIG. 6 is a schematic structural diagram of a device for correcting response time of a particulate matter sensor according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Wherein the described embodiments are some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Also, in the description of the embodiment of the present application, "/" means or means, for example, a/B may mean a or B, and "and/or" in the text is merely an association relationship describing the association object means that three relationships may exist, for example, a and/or B may mean that three cases of a alone, a and B together, and B alone exist, and further, in the description of the embodiment of the present application, "a plurality" means two or more.
The terms "first," "second," and the like, are used below for descriptive purposes only and are not to be construed as implying or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", or the like may explicitly or implicitly include one or more such feature, and in the description of embodiments of the application, unless otherwise indicated, the meaning of "a plurality" is two or more.
The following explains the related terms or devices to which embodiments of the present application relate:
A particulate matter sensor (Particulate Matter, PM) is a sensor installed in the engine exhaust system that converts the concentration of particulate matter into a current value to monitor the DPF conversion efficiency. The particle sensor mainly comprises a sensor probe, a wire harness and a control unit, wherein the connector of the probe and the control unit are not detachable.
The oxidation catalyst (Diesel Oxidation Catalysis, DOC) is characterized by that the noble metal catalyst (such as Pt, etc.) is coated on the honeycomb ceramic carrier, so that it can reduce the chemical reaction activation energy of HC, CO and SOF in the tail gas of engine, and can make these substances and oxygen in the tail gas implement oxidation reaction at lower temp. and finally convert them into CO2 and H2O. The oxidation type catalytic converter does not need a regeneration system and a control device, has the characteristics of simple structure and good reliability, and has been applied to modern small-sized engines to a certain extent.
A particulate trap (Diesel Particulate Filter, DPF) is a particulate filter mounted in an engine exhaust system with a porous carrier medium as a filter element. Particulate matter trapping technology filters and traps particulates in engine exhaust primarily through diffusion, deposition and impact mechanisms. The exhaust gas flows through the trap where particles are trapped in the filter element of the filter body, leaving cleaner exhaust gas to be discharged into the atmosphere. The wall-flow honeycomb ceramic filter is mainly used for engineering machinery and urban buses at present, and is characterized by simple operation and high filtering efficiency, but has the problems of regeneration of the filter and sensitivity to sulfur components in fuel oil.
Selective Catalytic Reduction (SCR) technology is used in diesel engine aftertreatment applications to reduce the content of nitrogen oxides (NOx) in the exhaust gas of the engine. Nitrogen oxide is one of main harmful components of the tail gas of a diesel engine, the working principle of SCR is that a reducing agent is sprayed into an exhaust pipeline, and the reducing agent reacts with nitrogen oxide in the tail gas under the catalysis of a catalyst, so that the aim of reducing the concentration of the nitrogen oxide is fulfilled.
The reductant currently used for SCR is ammonia (NH 3). In practical application, for convenience of storage and transportation, an aqueous solution of urea (NH 2CONH 2) (urea or Adblue, i.e. a 32.5% aqueous solution of urea) is loaded on a vehicle. The urea is preheated in a tail gas pipeline to generate ammonia gas and water, and the ammonia gas and nitrogen oxides (mainly NO and NO 2) in the tail gas are subjected to reduction reaction to generate nitrogen gas and water.
Ammonia slip catalyst (ammnia SLIP CATALYST, ASC).
Particulate matter, the particulate matter contained in the engine exhaust, generally comprises two components, namely a boot and an ash, wherein the boot refers to a part which can be burned off through regeneration, the ash refers to a non-combustible component which can be accumulated in the DPF all the time, and when a certain accumulated amount is reached, ash removal is needed manually.
FIG. 3 is a schematic diagram of an architecture of an engine exhaust system in which the engine, DOC, DPF, SCR, ASC, and PM sensors are connected in series. In the related art, a PM sensor is installed at the end of an exhaust system of an engine, when exhaust gas of the engine passes through the PM sensor, particulate matters such as soot in the exhaust gas are adsorbed on electrodes on the surface of the sensor, and as the adsorbed particulate matters are continuously increased, current is generated between the two electrodes.
When the trapping efficiency of the DPF decreases, the carbon load leaking to the PM sensor downstream of the SCR gradually increases, resulting in an increase in the current between the electrodes on the sensor, and when the response time when the current value exceeds the current error reporting limit value is smaller than the predetermined response time, the DPF is considered to be invalid.
For the engine with the PM sensor, when the ammonia leakage amount is higher, ammonia and water leaked out form ammonia water, so that the current measured by the PM sensor is larger, the response time for the current of the PM sensor to reach the current error reporting limit value is shortened, the current of the PM sensor is larger due to the higher ammonia leakage amount, so that the PM sensor erroneously determines that the DPF fails, and the accuracy of monitoring the particle trapping efficiency of the DPF based on the PM sensor is influenced.
In view of the above, the present application provides a method, apparatus and device for correcting response time of a particulate matter sensor, which are used for solving the problem that the accuracy of monitoring the particle capturing efficiency of a DPF based on a PM sensor is affected due to the current of the particulate matter sensor becoming large caused by higher ammonia leakage in the related art.
The application concept of the application can be summarized in that when the current of the PM particulate matter sensor reaches the current limit value, the real-time ammonia leakage quantity of the engine and the real-time response time of the current of PM reaching the current limit value from zero under the current real-time working condition point are obtained, and the response time correction coefficient corresponding to the real-time ammonia leakage quantity is obtained through the comparison experiment that the current of PM reaches the preset current from zero when the ammonia leakage quantity of the engine under the same current real-time working condition point is different values, and finally, the real-time response time is corrected by adopting the response time correction coefficient. In summary, the embodiment of the application considers the influence of the ammonia leakage amount of the engine tail exhaust on the current of the PM sensor, increases the step of correcting the response time of the particulate matter sensor based on the ammonia leakage amount, and avoids the influence of the ammonia leakage amount on the accuracy of monitoring the particulate trapping efficiency of the DPF, thereby ensuring the accuracy of monitoring the particulate trapping efficiency of the DPF.
After the main inventive concept of the embodiments of the present application is introduced, some simple descriptions are made below on application scenarios applicable to the technical solution of the embodiments of the present application, and it should be noted that the application scenarios described below are only used to illustrate the embodiments of the present application and are not limiting. In the specific implementation, the technical scheme provided by the embodiment of the application can be flexibly applied according to actual needs.
In order to facilitate understanding of the method for correcting response time of the particulate matter sensor provided by the embodiment of the present application, the following description will further explain the method with reference to the accompanying drawings.
In one possible embodiment, the present application provides a method for correcting response time of a particulate matter sensor, which is applied to an engine exhaust system as shown in fig. 1, and the overall flow is as shown in fig. 2, and includes the following steps:
in step 201, when it is determined that the current of the PM particulate matter sensor reaches the current limit, the real-time ammonia leakage amount of the engine and the real-time response time for the current of PM to reach the current limit from zero at the current real-time operating point are obtained.
In one possible implementation, the process of obtaining the real-time ammonia leakage of the engine at the current real-time working point according to the present application is shown in fig. 3, and may be implemented as the following steps:
in step 301, the actual urea injection and ammonia recovery from the selective catalytic reducer at the current real-time operating point is obtained.
In step 302, a delta amount of nitrogen oxides upstream and downstream of the selective catalytic reducer at a current real-time operating point is obtained, and an ammonia reaction amount is obtained according to the delta amount.
In step 303, a real-time ammonia slip for the engine at the current real-time operating point is obtained based on the actual urea injection, ammonia recovery and ammonia reaction.
For example, the temperature of the downstream of the SCR at the current real-time operating point is 250 ℃, the flow rate of the exhaust gas is 300 3/h, the actual urea injection amount of the selective catalytic reducer is a, part of ammonia which is not subjected to chemical reaction after being injected into the exhaust system of the engine is recovered, the ammonia recovery amount is b through a sensor, the difference between the nitrogen oxides at the upstream and downstream of the selective catalytic reducer can be obtained, the ammonia reaction amount is C according to the chemical equation of the nitrogen oxides and the ammonia reaction and the difference between the nitrogen oxides (namely the amount participating in the chemical reaction), and the real-time ammonia leakage amount of the engine at the current real-time operating point is d according to the actual urea injection amount a, the ammonia recovery amount b and the ammonia reaction amount C.
In one possible implementation, the present embodiment directly reads the real-time response time of the current of the PM from zero to the current limit through the PM sensor.
In step 202, based on a predetermined first comparison response time when the current of the PM reaches a preset current from zero when the ammonia leakage amount of the engine is zero at the real-time operating point, and a predetermined second comparison response time when the current of the PM reaches 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 comparison response time and the second comparison response time corresponding to the real-time ammonia leakage amount.
In one possible implementation manner, a first comparison response time from zero to a preset current of the PM when the ammonia leakage amount of the engine is zero at a real-time working point and a second comparison response time from zero to a preset current of the PM when the ammonia leakage amount of the engine is different at a real-time working point are predetermined through comparison experiments, and a specific flow chart is shown in fig. 4, and includes the following contents:
in step 401, the operating point of the engine is adjusted to a plurality of different operating points by the controller, and the actual urea injection amount of the selective catalytic reducer is adjusted such that the ammonia leakage amount of the engine is different.
In one possible implementation, in order to enable the data of the comparative experiment to cover a larger 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, as shown in fig. 5, including the following:
in step 501, the SCR downstream temperature of the engine and the exhaust gas flow are adjusted to a plurality of different values by the controller.
In step 502, any one of a plurality of different SCR downstream temperature values and any one of a plurality of exhaust gas flow values is matched to one operating point, resulting in a plurality of different operating points.
For example, the SCR downstream temperature of the engine may be adjusted to 250 ℃ and 350 ℃, the exhaust gas flow may be adjusted to 300 3/h and 60m 3/h, any of a plurality of different SCR downstream temperature values and any of the plurality of exhaust gas flow values may be matched to one operating point, i.e., embodiments of the present application may be able to match 2 values of the SCR downstream temperature with 2 values of the exhaust gas flow one by one, such as 250 ℃ for the SCR downstream temperature and 300 3/h for the exhaust gas flow, 250 ℃ for the SCR downstream temperature and 60m 3/h for the exhaust gas flow as one operating point, and so on, resulting in 4 different operating points for matching with the real-time operating point.
In addition, in step 401, the actual urea injection quantity of the selective catalytic reducer is adjusted to enable the ammonia leakage quantity of the engine to be different values, wherein the ammonia leakage quantity of the selective catalytic reducer is 0 when the actual urea injection quantity of the selective catalytic reducer is equal to x when the actual urea injection quantity is 1.5 times of overspray and y when the actual urea injection quantity is 2 times of overspray, and so on.
After obtaining a plurality of different working conditions and adjusting the ammonia leakage amount of the engine to a plurality of different values in a comparison experiment, in step 402, a first comparison response time when the current of PM reaches a preset current from zero when the ammonia leakage amount of the engine is zero at different working conditions and a second comparison response time when the current of PM reaches the preset current from zero at different ammonia leakage amounts of the engine at different working conditions are determined. Step 402 is a step of obtaining a plurality of comparison response times corresponding to different working condition points and different ammonia leakage amounts through a comparison experiment, so that the first comparison response time and the second comparison response time under the real-time working condition points can be conveniently obtained through screening in the subsequent step 403.
In step 403, a first control response time is selected from the first control response times, in which the current of the PM reaches a preset current from zero when the ammonia leakage amount of the engine at the real-time operating point is zero, and a second control response time is selected from the second control response times, in which the current of the PM reaches a 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 one possible implementation, after the first control response time and the second control response time corresponding to the real-time ammonia leakage are obtained by screening in step 403, the following response time correction coefficient is used to determine the following response time correction coefficient corresponding to the real-time ammonia leakage in formula (1):
f=ta/ tb (1)
Wherein t a represents a first control response time, t b represents a second control response time corresponding to the real-time ammonia leakage amount, and f represents a response time correction coefficient corresponding to the real-time ammonia leakage amount.
In step 203, the real-time response time is corrected according to the response time correction coefficient, and the corrected response time corresponding to the real-time ammonia leakage amount is obtained.
In a possible implementation manner, the embodiment of the application adopts the following correction response time determining formula (2) to correct the real-time response time according to the response time correction coefficient, so as to obtain the correction response time corresponding to the real-time ammonia leakage amount:
T2＝T1*f (2)
Wherein T 1 represents a real-time response time, T 2 represents a corrected response time corresponding to the real-time ammonia leakage amount, and f represents a response time correction coefficient.
In summary, the embodiment of the application considers the influence of the ammonia leakage amount of the engine tail exhaust on the current of the PM sensor, increases the step of correcting the response time of the particulate matter sensor based on the ammonia leakage amount, and avoids the influence of the ammonia leakage amount on the accuracy of monitoring the particulate trapping efficiency of the DPF, thereby ensuring the accuracy of monitoring the particulate trapping efficiency of the DPF.
Based on the same inventive concept, the present application provides a correction device of response time of a particulate matter sensor, applied to an engine exhaust system, as shown in fig. 6, the device 600 includes:
A real-time data acquisition module 601 configured to acquire a real-time ammonia leakage amount of the engine and a real-time response time of the current of the PM from zero to a current limit value at a current real-time operating point when it is determined that the current of the PM particulate matter sensor reaches the current limit value;
A response time correction coefficient determining module 602, configured to obtain a response time correction coefficient corresponding to the real-time ammonia leakage amount according to a first comparison response time when the current of the PM reaches a preset current from zero when the ammonia leakage amount of the engine is zero at a real-time working point and a second comparison response time when the current of the PM reaches the preset current from zero at different ammonia leakage amounts of the engine at the real-time working point;
and a response time correction module 603 configured to correct the real-time response time according to the response time correction coefficient, so as to obtain a corrected response time corresponding to the real-time ammonia leakage.
In one possible embodiment, the acquiring the real-time ammonia leakage amount of the engine at the current real-time operating point is performed, and the real-time data acquisition module is configured to:
Acquiring the actual urea injection quantity and ammonia recovery quantity of a selective catalytic reducer at the current real-time working point;
acquiring the difference of nitrogen oxides at the upstream and downstream of a selective catalytic reducer at the current real-time working point, and obtaining ammonia reaction quantity according to the difference;
and obtaining the real-time ammonia leakage quantity of the engine at the current real-time working point according to the actual urea injection quantity, the ammonia recovery quantity and the ammonia reaction quantity.
In one possible embodiment, the first control response time of the predetermined PM current from zero to a preset current when the engine ammonia leakage amount is zero at the real-time operating point and the second control response time of the PM current from zero to a preset current at different engine ammonia leakage amounts at the real-time operating point are performed, and the response time correction factor determining module is configured to:
adjusting the working condition point of the engine into a plurality of different working condition points through the controller, and adjusting the actual urea injection quantity of the selective catalytic reducer to enable the ammonia leakage quantity of the engine to be different values;
Determining a first comparison response time when the current of PM reaches a preset current from zero when the ammonia leakage amount of the engine is zero at different working points, and a second comparison response time when the current of PM reaches the preset current from zero at different ammonia leakage amounts of the engine at different working points;
And selecting a first comparison response time from the first comparison response time when the current of PM reaches a preset current from zero when the ammonia leakage amount of the engine is zero at the real-time working point, and selecting a second comparison response time from the second comparison response time when the current of PM reaches the preset current from zero when the ammonia leakage amount of the engine is real-time ammonia leakage amount at the real-time working point.
In one possible implementation, the adjusting, by the controller, the operating point of the engine to a plurality of different operating points is performed, and the response time correction factor determination module is configured to:
adjusting, by a controller, an SCR downstream temperature of the engine and an exhaust gas flow to a plurality of different values;
and matching any one of the plurality of different SCR downstream temperature values with any one of the plurality of exhaust flow values to form a working point, so as to obtain a plurality of different working points.
In one possible implementation, the response time correction factor determination module is configured to obtain the response time correction factor corresponding to the real-time ammonia leakage amount from 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 factor determination formula:
f=ta/tb
wherein 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.
In one possible implementation, the response time correction module is configured to correct the real-time response time according to the response time correction coefficient using the following correction response time determination formula, to obtain a corrected response time corresponding to the real-time ammonia leakage amount:
T2＝T1*f
Wherein T 1 represents the real-time response time, T 2 represents the corrected response time corresponding to the real-time ammonia leakage amount, and f represents the response time correction coefficient.
An electronic device 130 according to this embodiment of the application is described below with reference to fig. 7. The electronic device 130 shown in fig. 7 is only an example and should not be construed as limiting the functionality and scope of use of embodiments of the application.
As shown in fig. 7, the electronic device 130 is in the form of a general-purpose electronic device. The 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 the various 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, and a local bus using any of a variety of bus architectures.
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 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 or some combination of which may include an implementation of a network environment.
The electronic device 130 may also communicate with one or more external devices 134 (e.g., keyboard, pointing device, etc.), one or more devices that enable a user to interact with the electronic device 130, and/or any device (e.g., router, modem, etc.) that enables the electronic device 130 to communicate with one or more other electronic devices. Such communication may occur through an input/output (I/O) interface 135. Also, electronic device 130 may 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 network adapter 136. As shown, network adapter 136 communicates with other modules for electronic device 130 over bus 133. It should be appreciated that although not shown, other hardware and/or software modules may be used in connection with electronic device 130, including, but not limited to, microcode, device drivers, redundant processors, external disk drive arrays, RAID systems, tape drives, data backup storage systems, and the like.
In an exemplary embodiment, the application also provides a computer readable storage medium including instructions, such as memory 132 including instructions, executable by processor 131 of electronic device 130 to perform the method of correcting the response time of the particulate matter sensor. Alternatively, the computer readable storage medium may be a non-transitory computer readable storage medium, for example, a ROM, a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.
In an exemplary embodiment, a computer program product is also provided, comprising a computer program which, when executed by the processor 131, implements a method of correcting the response time of a particulate matter sensor as provided by the present application.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. 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, and the like) 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 application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. A method of modifying a response time of a particulate matter sensor for application to an engine exhaust system, the method comprising:
When the current of the particulate matter sensor reaches a current limit value, acquiring the real-time ammonia leakage quantity of the engine under the current real-time working condition point and the real-time response time of the current of the particulate matter sensor reaching the current limit value from zero;
Based on a first comparison response time when the current of the particulate matter sensor reaches a preset current from zero when the ammonia leakage amount of the engine is zero at a real-time working point and a second comparison response time when the current of the particulate matter sensor reaches the preset current from zero at different ammonia leakage amounts of the engine at the real-time working point, obtaining a response time correction coefficient corresponding to the real-time ammonia leakage amount according to the first comparison response time and the second comparison response time corresponding to the real-time ammonia leakage amount;
And correcting 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.
2. The method of claim 1, wherein said obtaining a real-time ammonia slip of the engine at the current real-time operating point comprises:
Acquiring the actual urea injection quantity and ammonia recovery quantity of a selective catalytic reducer at the current real-time working point;
acquiring the difference of nitrogen oxides at the upstream and downstream of a selective catalytic reducer at the current real-time working point, and obtaining ammonia reaction quantity according to the difference;
and obtaining the real-time ammonia leakage quantity of the engine at the current real-time working point according to the actual urea injection quantity, the ammonia recovery quantity and the ammonia reaction quantity.
3. The method of claim 1, wherein the predetermining a first control response time for the current of the particulate matter sensor from zero to a predetermined current when the amount of ammonia leakage from the engine is zero at the real-time operating point, and a second control response time for the current of the particulate matter sensor from zero to the predetermined current at different amounts of ammonia leakage from the engine at the real-time operating point, comprises:
adjusting the working condition point of the engine into a plurality of different working condition points through the controller, and adjusting the actual urea injection quantity of the selective catalytic reducer to enable the ammonia leakage quantity of the engine to be different values;
determining a first comparison response time when the current of the particulate matter sensor reaches a preset current from zero when the ammonia leakage amount of the engine is zero at different working points, and a second comparison response time when the current of the particulate matter sensor reaches the preset current from zero at different ammonia leakage amounts of the engine at different working points;
And selecting a first comparison response time from the first comparison response time when the current of the particulate matter sensor reaches a preset current from zero when the ammonia leakage amount of the engine under the real-time working condition point is zero, and selecting a second comparison response time from the second comparison response time when the current of the particulate matter sensor reaches the preset current from zero when the ammonia leakage amount of the engine under the real-time working condition point is the real-time ammonia leakage amount.
4. The method of claim 3, wherein the adjusting, by the controller, the operating point of the engine to a plurality of different operating points comprises:
adjusting, by a controller, an SCR downstream temperature of the engine and an exhaust gas flow to a plurality of different values;
and matching any one of the downstream temperature values of the SCRs and any one of the exhaust gas flows of the exhaust gas flow values into one working point to obtain a plurality of different working points.
5. The method of claim 1, wherein the response time correction factor corresponding to the real-time ammonia slip is obtained from the first control response time and a second control response time corresponding to the real-time ammonia slip using the following response time correction factor determination formula:
f=ta/tb
wherein 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 of claim 1, wherein the real-time response time is corrected according to the response time correction coefficient using the following correction response time determination formula to obtain a corrected response time corresponding to the real-time ammonia leakage amount:
T2＝T1*f
Wherein T 1 represents the real-time response time, T 2 represents the corrected response time corresponding to the real-time ammonia leakage amount, and f represents the response time correction coefficient.
7. A particulate matter sensor response time correction device for use in an engine exhaust system, the device comprising:
the real-time data acquisition module is configured to acquire the real-time ammonia leakage quantity of the engine under the current real-time working condition point and the real-time response time of the current of the particulate matter sensor reaching the current limit value from zero when the current of the particulate matter sensor reaches the current limit value;
The response time correction coefficient determining module is configured to obtain a response time correction coefficient corresponding to the real-time ammonia leakage amount according to a first comparison response time when the current of the particulate matter sensor reaches a preset current from zero when the ammonia leakage amount of the engine is zero at a real-time working point and a second comparison response time when the current of the particulate matter sensor reaches the preset current from zero at different ammonia leakage amounts of the engine at the real-time working point;
And 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, comprising:
a processor and a memory;
The memory is configured to store the processor-executable instructions;
the processor is configured to execute the instructions to implement a method of correcting a response time of a particulate matter sensor as claimed in any one of claims 1 to 6.
9. A computer readable storage medium, characterized in that instructions in the computer readable storage medium, when executed by a processor of an electronic device, enable the electronic device to perform a method of correcting the response time of a particulate matter sensor according to any one of claims 1-6.
10. A computer program product comprising a computer program which, when executed by a processor, implements a method of correcting the response time of a particulate matter sensor according to any one of claims 1-6.
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