CN111794842B - Urea pump early warning method and device - Google Patents

Urea pump early warning method and device Download PDF

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Publication number
CN111794842B
CN111794842B CN202010704573.8A CN202010704573A CN111794842B CN 111794842 B CN111794842 B CN 111794842B CN 202010704573 A CN202010704573 A CN 202010704573A CN 111794842 B CN111794842 B CN 111794842B
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urea pump
duty ratio
mileage
urea
driving mileage
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CN111794842A (en
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王永来
魏京
陈翠翠
何伟
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Weichai Power Co Ltd
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Weichai Power Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1433—Pumps
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

The method comprises the steps of constructing a prediction model in advance, sequentially inputting each driving range into the prediction model in the process of predicting the service life of a urea pump by using the prediction model to obtain the duty ratio of the urea pump corresponding to each driving range, determining the duty ratio of the urea pump exceeding the calibrated duty ratio of the urea pump and the driving range corresponding to the duty ratio of the urea pump exceeding the calibrated duty ratio of the urea pump to obtain a target driving range, so as to determine the driving range when the urea pump fails or fails, realize the prediction of the service life of the urea pump, and perform early warning before the urea pump fails or fails. Therefore, a user can timely maintain or replace the urea pump after the urea pump fails or fails based on early warning of spare parts in advance, and the problem that the engine is limited in torque and cannot normally operate due to the failure of the urea pump is avoided.

Description

Urea pump early warning method and device
Technical Field
The application belongs to the technical field of urea pumps, and particularly relates to a urea pump early warning method and device.
Background
The existing method for treating automobile exhaust by adopting an SCR (selective catalytic reduction) aftertreatment system in an engine is characterized in that the working principle of the SCR aftertreatment system is as follows: the urea pump sprays urea into the tail gas after-treatment device, the urea is decomposed into ammonia gas at high temperature, and the ammonia gas can react with nitrogen oxide under the action of the catalyst to generate harmless nitrogen and water. In the process, the urea pump is used for extracting urea from the urea tank, pressurizing the urea and sending the urea to the injection unit so as to inject the urea through the injection unit.
In practical application, the urea pump needs to be maintained or replaced along with the use of the urea pump, so that the problem that the urea pump cannot be used due to the fact that the engine is limited in torque caused by the failure of the urea pump is avoided.
However, in the prior art, only whether the urea pump has failed or not can be detected, and the service life of the urea pump cannot be predicted so as to give an early warning when the urea pump has not failed or failed.
Disclosure of Invention
In view of this, an object of the present application is to provide a method and an apparatus for early warning a urea pump, so as to solve the problem that in the prior art, only whether the urea pump has failed or failed can be detected, and the service life of the urea pump cannot be predicted, so as to provide an early warning when the urea pump has not failed or failed.
The technical scheme is as follows:
a urea pump warning method, comprising:
sequentially inputting the driving mileage into a pre-constructed prediction model to obtain the duty ratio of the urea pump corresponding to the driving mileage; the prediction model is constructed on the basis of the collected driving mileage and the corresponding duty ratio of the urea pump;
determining the duty ratio of the urea pump exceeding the duty ratio of the calibrated urea pump and the driving mileage corresponding to the duty ratio of the urea pump exceeding the duty ratio of the calibrated urea pump to obtain the target driving mileage;
and carrying out early warning based on the target driving mileage.
Preferably, the prediction model is constructed by the following method, including:
determining whether the engine is in an idling condition;
if the engine is determined to be in the idle working condition, determining whether the urea pump is in a normal pressure build state and whether the urea pump is in a state of not injecting urea;
if the urea pump is determined to be in a normal pressure build state and is in a state of not spraying urea, acquiring the duty ratio of the urea pump and the corresponding driving mileage;
and performing curve fitting based on the obtained urea pump duty ratio and the corresponding driving mileage to obtain a curve equation, wherein the curve equation is the prediction model and is used for predicting the urea pump duty ratio.
Preferably, the obtaining a curve equation by performing curve fitting based on the obtained urea pump duty ratio and the corresponding mileage includes:
and performing curve fitting by adopting a least square method based on the obtained urea pump duty ratio and the corresponding driving mileage to obtain a curve equation.
Preferably, the performing early warning based on the target mileage includes:
acquiring the current driving mileage;
calculating a difference value between the target mileage and the current mileage;
determining whether the difference value is less than a preset mileage;
and if the difference is smaller than the preset mileage, outputting prompt information, wherein the prompt information is used for reminding a user of carrying out spare parts.
Preferably, the outputting the prompt message includes:
and outputting prompt information through the CAN message.
The application also provides a urea pump early warning device, includes:
the input unit is used for sequentially inputting the driving mileage into a pre-constructed prediction model to obtain the duty ratio of the urea pump corresponding to the driving mileage; the prediction model is constructed on the basis of the collected driving mileage and the corresponding duty ratio of the urea pump;
the determining unit is used for determining the duty ratio of the urea pump exceeding the calibrated urea pump duty ratio and the driving mileage corresponding to the urea pump duty ratio exceeding the calibrated urea pump duty ratio to obtain the target driving mileage;
and the early warning unit is used for early warning based on the target driving mileage.
Preferably, the method further comprises the following steps: a building unit;
the construction unit is used for determining whether the engine is in an idling working condition; if the engine is determined to be in the idle working condition, determining whether the urea pump is in a normal pressure build state and whether the urea pump is in a state of not injecting urea; if the urea pump is determined to be in a normal pressure build state and is in a state of not spraying urea, acquiring the duty ratio of the urea pump and the corresponding driving mileage; and performing curve fitting based on the obtained urea pump duty ratio and the corresponding driving mileage to obtain a curve equation, wherein the curve equation is the prediction model and is used for predicting the urea pump duty ratio.
Preferably, the building unit performs curve fitting based on the obtained urea pump duty ratio and the corresponding mileage to obtain a curve equation, and specifically includes:
and performing curve fitting by adopting a least square method based on the obtained urea pump duty ratio and the corresponding driving mileage to obtain a curve equation.
Preferably, the early warning unit performs early warning based on the target mileage, and specifically includes:
acquiring the current driving mileage;
calculating a difference value between the target mileage and the current mileage;
determining whether the difference value is less than a preset mileage;
and if the difference is smaller than the preset mileage, outputting prompt information, wherein the prompt information is used for reminding a user of carrying out spare parts.
Preferably, the early warning unit outputs prompt information, which specifically includes:
and outputting prompt information through the CAN message.
Compared with the prior art, the technical scheme provided by the application has the following advantages:
according to the technical scheme, the prediction model is constructed in advance, in the process of predicting the service life of the urea pump by using the prediction model, the driving mileage is sequentially input into the prediction model to obtain the urea pump duty ratio corresponding to each driving mileage, the urea pump duty ratio exceeding the calibrated urea pump duty ratio and the driving mileage corresponding to the urea pump duty ratio exceeding the calibrated urea pump duty ratio are determined, the target driving mileage is obtained, the driving mileage when the urea pump fails or fails is determined, the service life of the urea pump is predicted, and early warning is performed before the urea pump fails or fails. Therefore, a user can timely maintain or replace the urea pump after the urea pump fails or fails based on early warning of spare parts in advance, and the problem that the engine is limited in torque and cannot normally operate due to the failure of the urea pump is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of a urea pump warning method disclosed herein;
FIG. 2 is a flow chart of a construction of a predictive model as disclosed herein;
FIG. 3 is a graphical representation of a vehicle 1 urea pump duty cycle and corresponding mileage curve as disclosed herein;
FIG. 4 is a graphical illustration of a vehicle 2 urea pump duty cycle and corresponding range curve as disclosed herein;
fig. 5 is a schematic structural diagram of a urea pump early warning device disclosed in the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment of the application provides a urea pump early warning method, so that the service life of a urea pump is predicted, early warning is realized before the urea pump fails or fails, a user can timely maintain or replace the urea pump after the urea pump fails or fails on the basis of early warning of spare parts in advance, and the problem that the engine is limited in torque and cannot normally run due to the fact that the urea pump fails or fails is avoided.
Specifically, referring to fig. 1, the urea pump warning method may include the following steps:
s101, sequentially inputting the driving mileage into a pre-constructed prediction model to obtain the duty ratio of the urea pump corresponding to the driving mileage; the prediction model is constructed based on the collected driving mileage and the corresponding duty ratio of the urea pump.
And a prediction model is constructed in advance, and the prediction model is used for predicting the service life of the urea pump. The life of the urea pump is predicted based on the urea pump duty cycle in this embodiment.
Therefore, a prediction model is constructed and obtained based on a plurality of driving miles acquired in the running process of the engine and a plurality of urea pump duty ratios respectively corresponding to the plurality of driving miles, so that the corresponding urea pump duty ratios can be obtained by outputting the driving miles to the prediction model.
In the process of predicting the service life of the urea pump based on the prediction model, the driving mileage which is larger than the current driving mileage is generally input into the prediction model in sequence, so that the predicted urea pump duty ratio corresponding to each subsequent driving mileage can be predicted, and the urea pump can be predicted to be in failure when the driving mileage is obtained.
For example, if the current driving mileage of the vehicle is 20 kilometers, then 21 kilometers, 22 kilometers, 23 kilometers, 24 kilometers, 25 kilometers, 26 kilometers, and 27 kilometers are sequentially input into the prediction model, and the duty ratio of the urea pump corresponding to each input driving mileage is obtained respectively. As shown in table 1, the relationship between the respective mileage and the duty ratio of the urea pump is shown.
TABLE 1
Mileage of driving Duty ratio (%)
21 kilometres 57.5694
22 kilometers 61.761
23 kilometers of 66.2258
24 kilometers 70.9638
25 kilometers 75.975
26 kilometers 81.2594
27 kilometers of 86.817
Of course, the number of the traveled mileage of the input prediction model is not limited, and the magnitude of the difference between the traveled mileage of two adjacent input prediction models is not limited.
For example, the respective mileage may be input at fixed mileage intervals, or may be input at variable mileage intervals.
S102, determining the duty ratio of the urea pump exceeding the duty ratio of the calibrated urea pump and the driving mileage corresponding to the duty ratio of the urea pump exceeding the duty ratio of the calibrated urea pump, and obtaining the target driving mileage.
The duty ratio of a calibration urea pump is preset.
Internal wear results in a decrease in build-up capacity as the urea pump is used for a long period of time. In order to keep stable and normal urea pump pressure, the duty ratio of the urea pump can only be increased. When the duty ratio of the urea pump exceeds 85%, the duty ratio of the urea pump is increased, and the pressure of the urea pump is difficult to stabilize at a preset value. Based on this, the duty cycle of the calibrated urea pump is set to 85%.
And if the duty ratio of the urea pump exceeds 85%, determining that the urea pump needs to be maintained or replaced, and taking 85% as an early warning threshold.
And comparing the duty ratio of each urea pump obtained based on the prediction model with the duty ratio of the calibrated urea pump in sequence, and determining the duty ratio of the urea pump exceeding the duty ratio of the calibrated urea pump. And determining the corresponding driving mileage after determining the urea pump duty ratio exceeding the calibrated urea pump duty ratio.
Still taking table 1 as an example, comparing the duty cycle of the urea pump in the second row with the duty cycle of the calibrated urea pump in sequence, it is determined that 86.817% is greater than 85% of the duty cycle of the calibrated urea pump, that is, it is determined that the duty cycle of the urea pump exceeding the duty cycle of the calibrated urea pump is 86.817%. The mileage corresponding to 86.817% was then determined to be 27 kilometers. When the characteristic vehicle mileage reaches 27 kilometers, the urea pump is already out of order. 27 kilometers was taken as the target mileage.
And S103, early warning is carried out based on the target driving mileage.
The urea pump can be failed before the vehicle runs to the target driving mileage, and the driving mileage of the vehicle does not reach the target driving mileage at the moment, so that early warning can be realized.
For example, the target mileage is output, so that a user can obtain the current mileage of the vehicle and the target mileage of the urea pump which fails based on a vehicle instrument panel to prepare in advance, and an early warning effect is achieved.
Through the technical scheme, the embodiment is characterized in that a prediction model is constructed in advance, in the process of predicting the service life of the urea pump by using the prediction model, the driving mileage is sequentially input into the prediction model to obtain the urea pump duty ratio corresponding to each driving mileage, the urea pump duty ratio exceeding the calibrated urea pump duty ratio and the driving mileage corresponding to the urea pump duty ratio exceeding the calibrated urea pump duty ratio are determined to obtain the target driving mileage, so that the driving mileage when the urea pump fails or fails is determined, the prediction of the service life of the urea pump is realized, and early warning is performed before the urea pump fails or fails. Therefore, a user can timely maintain or replace the urea pump after the urea pump fails or fails based on early warning of spare parts in advance, and the problem that the engine is limited in torque and cannot normally operate due to the failure of the urea pump is avoided.
The method of constructing the predictive model, as shown in FIG. 2, is described in detail below and includes the following steps:
s201, determining whether the engine is in an idling working condition;
if the engine is determined to be in the idle condition, step S202 is executed.
And determining whether the engine is in an idling condition or not by detecting the rotating speed and the torque. Wherein, the engine is determined to be in an idle working condition according to the following conditions:
the rotating speed is 600 +/-2 r/min, and the torque is 0 +/-10 Nm.
S202, determining whether the urea pump is in a normal pressure building state and is in a state of not spraying urea;
if it is determined that the urea pump is normally pressurized and in a state where urea is not injected, step S203 is performed.
And determining whether the urea pump normally builds pressure and is in a state of not spraying urea by acquiring a state bit for marking whether the urea pump normally builds pressure and acquiring a state bit for marking whether the urea pump sprays urea.
For example, if the state bit for marking whether the urea pump normally builds the pressure is 1, the normal pressure building of the urea pump is determined; and if the state bit for marking whether the urea pump is normally pressurized is 0, determining that the urea pump cannot normally pressurize.
If the flag indicates that the state bit of urea injection is 1, determining that the urea injection state is in; if the flag indicates that the status bit for urea injection is 0, it is determined that urea is not injected.
And S203, acquiring the duty ratio of the urea pump and the corresponding driving mileage.
Because the duty ratio of the urea pump is a stable value in the state that the urea pump normally builds pressure and does not inject urea, the duty ratio of the urea pump is only obtained in the state that the urea pump normally builds pressure and does not inject urea.
Illustratively, as shown in Table 2, the urea pump duty cycles and corresponding miles driven for two vehicles are respectively extracted in such a manner that one urea pump duty cycle is extracted every ten thousand kilometers.
TABLE 2
Vehicle 1 Vehicle 2
1 kilometre 26.81 22.21
2 kilometers 28.42 22.33
3 kilometres 28.89 23.09
4 kilometers 30.8 24.92
5 kilometers 30.35 23.92
6 kilometers of 29.97 25.08
7 kilometers 29.76 25.28
8 kilometers 29.55 23.27
9 kilometers 29.34 30.79
10 kilometers 30.44 33.02
11 kilometers 29.24 32.27
12 kilometers per million 30.71 35.11
13 kilometers 31.27 40.55
14 kilometers of 32.25
15 kilometers 33.71
16 kilometers 38.65
17 kilometers 45.54
18 kilometers of 49.08
19 kilometers 56.07
20 kilometers 50.95
Of course, ten urea pump duty ratios can be uniformly extracted every ten thousand kilometers, and more accurate early warning is facilitated.
And S204, carrying out curve fitting based on the obtained urea pump duty ratio and the corresponding driving mileage to obtain a curve equation, wherein the curve equation is the prediction model and is used for predicting the urea pump duty ratio.
And drawing a curve based on the urea pump duty ratio and the corresponding driving mileage acquired in the table 2, and predicting the subsequent urea pump duty ratio according to the change trend of the curve.
And performing curve fitting to obtain a curve equation, wherein the curve equation is a functional relation between the driving mileage and the duty ratio of the urea pump. And (4) predicting the duty ratio of the urea pump by using a curve equation as a prediction model.
Illustratively, the curve fitting may be performed using a least squares method.
The obtained urea pump duty ratio and the corresponding driving mileage are different for each vehicle, so the curve equation obtained by curve fitting may be different.
The resulting curve is plotted for the urea pump duty cycle and corresponding range for vehicle 1 shown in table 2, and is shown in fig. 3.
In fig. 3, the abscissa represents the mileage of the vehicle 1 in ten thousand kilometers, and the ordinate represents the duty ratio of the urea pump.
Solving the regression equation of the duty ratio of the urea pump by using a least square method is as follows:
y＝ax2+bx+c
in the regression equation of the duty ratio of the urea pump, y is a dependent variable and represents the duty ratio of the urea pump, x is an independent variable and represents the driving mileage, and a, b and c are coefficients to be solved.
The urea pump duty cycle and corresponding range for vehicle 1 in table 2 are taken into the above equation and are represented in matrix form as follows:
Figure BDA0002594197710000091
the least square method can be used for obtaining:
Figure BDA0002594197710000092
the curve equation for vehicle 1 is obtained as follows, a is 0.1366, b is 1.6822, and c is 32.655: 0.1366x2-1.6822x+32.655。
Similarly, the urea pump duty cycle and the corresponding mileage of vehicle 2 shown in table 2 are plotted in fig. 4.
In fig. 4, the abscissa represents the mileage of the vehicle 1 in ten thousand kilometers, and the ordinate represents the duty ratio of the urea pump.
The curve equation for the vehicle 2 is obtained as: y is 0.1519x2-0.7694x+23.653。
And (4) taking the curve equation as a constructed prediction model to realize the early warning of the urea pump. The following describes a method for implementing early warning based on a prediction model for each of the vehicles 1 and 2.
In the vehicle 1, the following mileage acquired in table 2 is used as the independent variable x in order, and the input y is 0.1366x2-1.6822x +32.655, the urea pump duty cycle y is obtained for each mileage x.
As shown in Table 1, the first column is the mileage and the second column is the urea pump duty cycle.
The duty ratio of the urea pump is calibrated to be 85%, the duty ratio of the urea pump in the second row of the table 1 is compared with the duty ratio of the urea pump in sequence, 86.817% is determined to be larger than 85% of the duty ratio of the urea pump, and therefore the duty ratio of the urea pump exceeding the duty ratio of the urea pump is determined to be 86.817%. The mileage corresponding to 86.817% was then determined to be 27 kilometers. The urea pump has failed or failed when the vehicle is characterized by a mileage of 27 kilometers. 27 kilometers was taken as the target mileage.
After the target driving mileage is determined, the current driving mileage is far away from the target driving mileage, so that the early warning can be performed only when the vehicle is about to drive to reach the target driving mileage instead of directly early warning.
And if the difference value is smaller than the preset mileage, outputting prompt information, wherein the prompt information is used for reminding a user of carrying out spare parts so as to prepare for replacing the urea pump before the service life of the urea pump is reached.
In practical application, the prompt message CAN be output through the CAN message.
For example, if the current driving distance is 20 kilometers, the difference between the target driving distance of 27 kilometers and the current driving distance of 20 kilometers is calculated to be 7 kilometers, which indicates that the urea pump with the remaining 7 kilometers is out of service.
And setting a preset mileage according to an actual condition, and if the preset mileage is set to be 2 kilometers, outputting a prompt signal by the ECU through a CAN message when the difference between the target driving mileage of 27 kilometers and the current driving mileage is less than 2 kilometers when the current driving mileage exceeds 25 kilometers.
The prediction alarm device can output the prompt information to the prediction alarm device, the prediction alarm device prompts the predicted residual kilometer number to a user, and the user is prompted to maintain or repair and replace the urea pump in advance.
For the vehicle 2, the following mileage acquired in table 2 is used as the independent variable x in order, and the input y is 0.1519x2-0.7694x +23.653, the urea pump duty cycle y is obtained for each mileage x. The results are shown in Table 3 below.
Mileage of driving Duty ratio (%)
14 kilometers of 42.6538
15 kilometers 46.2895
16 kilometers 50.229
17 kilometers 54.4723
18 kilometers of 59.0194
19 kilometers 63.8703
20 kilometers 69.025
21 kilometres 74.4835
22 kilometers 80.2458
23 kilometers of 86.3119
The duty cycle of the urea pump is calibrated to be 85%, the duty cycle of the urea pump in the second row of the table 3 is compared with the duty cycle of the urea pump in sequence, and it is determined that 86.3119% is greater than 85% of the duty cycle of the urea pump, that is, it is determined that the duty cycle of the urea pump exceeding the duty cycle of the urea pump is 86.3119%. The mileage corresponding to 86.3119% was then determined to be 23 kilometers. When the characteristic vehicle has a mileage of 23 kilometers, the urea pump has failed or failed. The target mileage is 23 kilometers.
And obtaining the current driving mileage of 13 kilometers, calculating the difference value between the target driving mileage of 23 kilometers and the current driving mileage of 13 kilometers, wherein the difference value is 10 kilometers of company, and about 10 kilometers of residual urea pump is proved to be invalid.
Since 10 kilometers is far greater than the preset mileage by 2 kilometers, the prompt information is not output until the vehicle 2 travels to 21 kilometers.
Corresponding to the urea pump early warning method disclosed in the above embodiment, this embodiment further provides a urea pump early warning device, as shown in fig. 5, the device includes:
an input unit 501, a determination unit 502 and an early warning unit 503.
An input unit 501, configured to sequentially input each driving range into a pre-constructed prediction model, so as to obtain a urea pump duty ratio corresponding to each driving range; the prediction model is constructed on the basis of the collected driving mileage and the corresponding duty ratio of the urea pump;
a determining unit 502, configured to determine a urea pump duty ratio exceeding the calibrated urea pump duty ratio and a driving range corresponding to the urea pump duty ratio exceeding the calibrated urea pump duty ratio, so as to obtain a target driving range;
and an early warning unit 503, configured to perform early warning based on the target mileage.
Through the technical scheme, the embodiment is characterized in that a prediction model is constructed in advance, in the process of predicting the service life of the urea pump by using the prediction model, the driving mileage is sequentially input into the prediction model to obtain the urea pump duty ratio corresponding to each driving mileage, the urea pump duty ratio exceeding the calibrated urea pump duty ratio and the driving mileage corresponding to the urea pump duty ratio exceeding the calibrated urea pump duty ratio are determined to obtain the target driving mileage, so that the driving mileage when the urea pump fails or fails is determined, the prediction of the service life of the urea pump is realized, and early warning is performed before the urea pump fails or fails. Therefore, a user can timely maintain or replace the urea pump after the urea pump fails or fails based on early warning of spare parts in advance, and the problem that the engine is limited in torque and cannot normally operate due to the failure of the urea pump is avoided.
Optionally, in other embodiments, the method further includes: and constructing a unit.
The construction unit is used for determining whether the engine is in an idling working condition; if the engine is determined to be in the idle working condition, determining whether the urea pump is in a normal pressure build state and whether the urea pump is in a state of not injecting urea; if the urea pump is determined to be in a normal pressure build state and is in a state of not spraying urea, acquiring the duty ratio of the urea pump and the corresponding driving mileage; and performing curve fitting based on the obtained urea pump duty ratio and the corresponding driving mileage to obtain a curve equation, wherein the curve equation is the prediction model and is used for predicting the urea pump duty ratio.
Optionally, the building unit performs curve fitting based on the obtained urea pump duty ratio and the corresponding mileage to obtain a curve equation, and specifically includes:
and performing curve fitting by adopting a least square method based on the obtained urea pump duty ratio and the corresponding driving mileage to obtain a curve equation.
Optionally, the early warning unit 503 performs early warning based on the target mileage, and specifically includes:
acquiring the current driving mileage;
calculating a difference value between the target mileage and the current mileage;
determining whether the difference value is less than a preset mileage;
and if the difference is smaller than the preset mileage, outputting prompt information, wherein the prompt information is used for reminding a user of carrying out spare parts.
Optionally, the early warning unit 503 outputs prompt information, which specifically includes:
and outputting prompt information through the CAN message.
While, for purposes of simplicity of explanation, the foregoing method embodiments have been described as a series of acts or combination of acts, it will be appreciated by those skilled in the art that the present invention is not limited by the illustrated ordering of acts, as some steps may occur in other orders or concurrently with other steps in accordance with the invention. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required by the invention.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the device-like embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (10)

1. A urea pump early warning method is characterized by comprising the following steps:
sequentially inputting the driving mileage into a pre-constructed prediction model to obtain the duty ratio of the urea pump corresponding to the driving mileage; the prediction model is constructed on the basis of the collected driving mileage and the corresponding duty ratio of the urea pump;
determining the duty ratio of the urea pump exceeding the duty ratio of the calibrated urea pump and the driving mileage corresponding to the duty ratio of the urea pump exceeding the duty ratio of the calibrated urea pump to obtain the target driving mileage;
and carrying out early warning based on the target driving mileage.
2. The urea pump warning method of claim 1, wherein the predictive model is constructed by a method comprising:
determining whether the engine is in an idling condition;
if the engine is determined to be in the idle working condition, determining whether the urea pump is in a normal pressure build state and whether the urea pump is in a state of not injecting urea;
if the urea pump is determined to be in a normal pressure build state and is in a state of not spraying urea, acquiring the duty ratio of the urea pump and the corresponding driving mileage;
and performing curve fitting based on the obtained urea pump duty ratio and the corresponding driving mileage to obtain a curve equation, wherein the curve equation is the prediction model and is used for predicting the urea pump duty ratio.
3. The urea pump early warning method according to claim 2, wherein the curve fitting based on the obtained urea pump duty cycle and the corresponding mileage to obtain a curve equation comprises:
and performing curve fitting by adopting a least square method based on the obtained urea pump duty ratio and the corresponding driving mileage to obtain a curve equation.
4. The urea pump warning method according to any one of claims 1 to 3, wherein the warning based on the target mileage includes:
acquiring the current driving mileage;
calculating a difference value between the target mileage and the current mileage;
determining whether the difference value is less than a preset mileage;
and if the difference is smaller than the preset mileage, outputting prompt information, wherein the prompt information is used for reminding a user of carrying out spare parts.
5. The urea pump warning method according to claim 4, wherein the outputting the prompt message includes:
and outputting prompt information through the CAN message.
6. A urea pump early warning device, its characterized in that includes:
the input unit is used for sequentially inputting the driving mileage into a pre-constructed prediction model to obtain the duty ratio of the urea pump corresponding to the driving mileage; the prediction model is constructed on the basis of the collected driving mileage and the corresponding duty ratio of the urea pump;
the determining unit is used for determining the duty ratio of the urea pump exceeding the calibrated urea pump duty ratio and the driving mileage corresponding to the urea pump duty ratio exceeding the calibrated urea pump duty ratio to obtain the target driving mileage;
and the early warning unit is used for early warning based on the target driving mileage.
7. The warning device of claim 6, further comprising: a building unit;
the construction unit is used for determining whether the engine is in an idling working condition; if the engine is determined to be in the idle working condition, determining whether the urea pump is in a normal pressure build state and whether the urea pump is in a state of not injecting urea; if the urea pump is determined to be in a normal pressure build state and is in a state of not spraying urea, acquiring the duty ratio of the urea pump and the corresponding driving mileage; and performing curve fitting based on the obtained urea pump duty ratio and the corresponding driving mileage to obtain a curve equation, wherein the curve equation is the prediction model and is used for predicting the urea pump duty ratio.
8. The early warning device according to claim 7, wherein the construction unit performs curve fitting based on the obtained urea pump duty cycle and the corresponding mileage to obtain a curve equation, and specifically comprises:
and performing curve fitting by adopting a least square method based on the obtained urea pump duty ratio and the corresponding driving mileage to obtain a curve equation.
9. The warning device according to any one of claims 6 to 8, wherein the warning unit performs warning based on the target mileage, and specifically includes:
acquiring the current driving mileage;
calculating a difference value between the target mileage and the current mileage;
determining whether the difference value is less than a preset mileage;
and if the difference is smaller than the preset mileage, outputting prompt information, wherein the prompt information is used for reminding a user of carrying out spare parts.
10. The warning device according to claim 9, wherein the warning unit outputs a prompt message, specifically including:
and outputting prompt information through the CAN message.
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