CN114705381A - Cleaning detection device, detection method and cleaning method - Google Patents

Cleaning detection device, detection method and cleaning method Download PDF

Info

Publication number
CN114705381A
CN114705381A CN202210254831.6A CN202210254831A CN114705381A CN 114705381 A CN114705381 A CN 114705381A CN 202210254831 A CN202210254831 A CN 202210254831A CN 114705381 A CN114705381 A CN 114705381A
Authority
CN
China
Prior art keywords
pipe
detected
valve
dpf
pipeline
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210254831.6A
Other languages
Chinese (zh)
Inventor
张硕
张苏苏
解同鹏
封栋梁
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Weichai Power Co Ltd
Weifang Weichai Power Technology Co Ltd
Original Assignee
Weichai Power Co Ltd
Weifang Weichai Power Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Weichai Power Co Ltd, Weifang Weichai Power Technology Co Ltd filed Critical Weichai Power Co Ltd
Priority to CN202210254831.6A priority Critical patent/CN114705381A/en
Publication of CN114705381A publication Critical patent/CN114705381A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
    • G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
    • G01M3/2846—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B5/00—Cleaning by methods involving the use of air flow or gas flow
    • B08B5/02—Cleaning by the force of jets, e.g. blowing-out cavities
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00—Measuring or testing not otherwise provided for

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Processes For Solid Components From Exhaust (AREA)

Abstract

The application relates to a cleaning detection device, a detection method and a cleaning method, which are used for detecting and cleaning an air intake pipe of a DPF (diesel particulate filter) differential pressure sensor, wherein the cleaning detection device comprises an air source, a controller, a valve part, a first pipeline and a second pipeline; a first air taking pipe and a second air taking pipe are connected between the DPF differential pressure sensor and the DPF; the first pipeline is communicated between the air source and a first interface of the first air taking pipe, and the second pipeline is communicated between the air source and a second interface of the second air taking pipe; the valve component comprises first valves respectively arranged on the gas taking pipes and second valves respectively arranged on the pipelines, and the controller is used for controlling the opening and closing of the valves. Through detecting, cleaning getting the trachea, can guarantee DPF differential pressure sensor measuring result's accuracy, avoid getting revealing and the measurement that the jam will directly influence DPF differential pressure sensor of trachea, lead to on-vehicle diagnostic system to report by mistake and trigger engine performance restriction then.

Description

Cleaning detection device, detection method and cleaning method
Technical Field
The application relates to the technical field of cleaning detection, in particular to a cleaning detection device, a detection method and a cleaning method, which are used for detecting and cleaning an air intake pipe of a DPF pressure difference sensor.
Background
A DPF (Diesel Particulate Filter) is a device installed in an exhaust system of a Diesel vehicle for reducing Particulate matters in exhaust gas by filtering, and a DPF differential pressure sensor, which is an important sensor related to emission, is connected with the upstream and downstream of the DPF through two gas extraction pipes, respectively, to sense a differential pressure between the front and the rear of the DPF.
Leakage and blockage of the gas extraction pipe will directly affect the measurement of the DPF differential pressure sensor, which in turn causes the vehicle-mounted diagnostic system to report errors and trigger engine performance limitations.
Therefore, how to detect and clean the gas taking pipe of the DPF differential pressure sensor to avoid the influence on the accuracy of the measurement result of the DPF differential pressure sensor due to the leakage and blockage faults of the gas taking pipe is a technical problem to be solved by the technical personnel in the field.
Disclosure of Invention
The application aims at providing a clean detection device, a detection method and a cleaning method, which are used for detecting and cleaning an air intake pipe of a DPF pressure difference sensor, ensuring the accuracy of the measurement result of the DPF pressure difference sensor, and avoiding the leakage and blockage of the air intake pipe from directly influencing the measurement of the DPF pressure difference sensor, so that an on-board diagnosis system reports errors and triggers the performance limitation of an engine.
In order to solve the technical problem, the application provides a cleaning detection device for detecting and cleaning an air intake pipe of a DPF differential pressure sensor, wherein the cleaning detection device comprises an air source, a controller, a valve component, a first pipeline and a second pipeline; one of the DPF pressure difference sensor and the upstream of the DPF and the DPF pressure difference sensor and the downstream of the DPF is connected with a first air intake pipe, and the other one of the DPF pressure difference sensor and the downstream of the DPF is connected with a second air intake pipe, wherein one end of the first air intake pipe facing the DPF pressure difference sensor is provided with a first interface, and one end of the second air intake pipe facing the DPF pressure difference sensor is provided with a second interface; the first pipeline is communicated between the gas source and the first interface, and the second pipeline is communicated between the gas source and the second interface; the valve component comprises first valves respectively arranged on the first gas taking pipe and the second gas taking pipe, and second valves respectively arranged on the first pipeline and the second pipeline, and the controller is used for controlling the opening and closing of the valves.
Optionally, the gas source is a vehicle gas tank.
The application also provides a detection method, which is based on the cleaning detection device and is used for detecting the gas taking pipe of the DPF differential pressure sensor; the detection method comprises the following steps:
s1: taking a first gas taking pipe as a pipe to be detected, taking a second gas taking pipe as a matching pipe, keeping a first valve arranged on the second gas taking pipe in an opening state, and keeping a second valve arranged on the second pipeline in a closing state;
s2: controlling the opening and closing of a first valve of a pipe to be detected and a second valve of a pipeline connected with the pipe to be detected through a controller so as to reach different states, and recording the pressure difference delta P detected by the DPF pressure difference sensor in different states;
s3: judging whether the pipe to be detected has a fault or not by analyzing the pressure difference delta P in different states;
s4: taking a second gas taking pipe as a pipe to be detected, taking a first gas taking pipe as a matching pipe, keeping a first valve arranged on the first gas taking pipe in an opening state, and keeping a second valve arranged on the first pipeline in a closing state;
s5: and detecting whether the pipe to be detected is in fault according to the steps S2-S3.
Optionally, in step S2, the following four states are sequentially achieved by adjusting the first valve of the pipe to be detected and the second valve of the pipeline connected to the pipe to be detected:
in the first state, a first valve of a pipe to be detected is opened, a second valve of a pipeline connected with the pipe to be detected is closed, and differential pressure delta P detected by a DPF differential pressure sensor is recorded as P1;
in the second state, the first valve of the pipe to be detected is closed, the second valve of the pipeline connected with the pipe to be detected is opened, and the pressure difference delta P detected by the DPF pressure difference sensor is recorded as P2;
in the third state, a first valve of a pipe to be detected is closed, a second valve of a pipeline connected with the pipe to be detected is closed, a first preset time is waited, and the pressure difference delta P detected by the DPF pressure difference sensor is recorded as P3;
in the fourth state, a first valve of a pipe to be detected is opened, a second valve of a pipeline connected with the pipe to be detected is closed, a second preset time is waited, and the pressure difference delta P detected by the DPF pressure difference sensor is recorded as P4;
in step S3, by analyzing the pressure differences Δ P in different states, it is determined whether the pipe to be detected has a fault, and the method specifically includes at least one of the following steps:
s31: judging whether the interface of the pipe to be detected is blocked or not according to the sizes of p1 and p 2;
s32: according to the difference between p2 and p3 and the first limit value pmaxJudging whether the pipe to be detected leaks or not;
s33: according to the difference between p3 and p4 and a second limit value pminAnd judging whether the pipe to be detected is blocked or not.
Optionally, in step S31, if the interface of the pipe to be detected is blocked, an interface blocking fault prompt is sent;
in step S32, if the pipe to be detected leaks, a leak failure prompt is issued.
Optionally, the following steps are further included between step S33 and step S4:
s34: if the pipe to be detected is blocked, opening a first valve of the pipe to be detected, and repeatedly opening and closing a second valve of a pipeline connected with the pipe to be detected until the pipe to be detected is not blocked according to the judgment in the step S33;
s35: and if the second valve of the pipeline connected with the pipe to be detected is repeatedly opened and closed for a preset number of times and the pipe to be detected is still blocked according to the judgment in the step S33, a blocking fault prompt is sent.
Optionally, step S1 is preceded by step S0: the engine is started.
The application also provides a cleaning method, which is based on the cleaning detection device and is used for cleaning the gas taking pipe of the DPF differential pressure sensor; the cleaning method comprises the following steps:
s100: judging whether the engine is in an idling state and meets a preset requirement;
s200: after the valves are opened simultaneously for preset time through the controller, closing the second valves;
s300: and repeating the step S200 until the preset times are reached or the engine speed is 0.
Optionally, in step S100, the preset requirement is whether the current driving cycle operation time exceeds a preset limit.
Optionally, between step S100 and step S200, step S110 is further included: latching the DPF differential pressure sensor signal.
Clean detection device can detect getting the trachea at last electricity initial stage, and is concrete, air supply accessible pipeline with get the trachea intercommunication to through four valve control two pipes and two break-make of pipeline in order to reach different detection state, combine the result of the pressure differential that DPF pressure differential sensor detected under different detection state, judge and get the trachea and whether break down, so that in time troubleshooting, avoid because get the accuracy that trachea trouble influences the testing result.
This clean detection device still can sweep the cleanness to getting the trachea after stopping, and is concrete, and the high-pressure compressed air of air supply can sweep getting the trachea through the pipeline to will get in the trachea because of the liquid or gaseous state water, matters such as soot that the engine operation produced blow off, avoid getting ponding or impurity production jam in the trachea, thereby reduce and get the probability that the trachea broke down.
The cleaning detection device is simple in overall structure, small in overall size, free of occupying more space and low in cost.
The detection method is based on the cleaning detection device for detecting the air intake pipe of the DPF pressure difference sensor, the cleaning method is based on the cleaning detection device for cleaning the air intake pipe of the DPF pressure difference sensor, the technical effects of the detection method and the cleaning method are similar to those of the cleaning detection device, and the details are not repeated herein for saving the text.
Drawings
Fig. 1 is a schematic structural diagram of a cleaning detection device provided in an embodiment of the present application in a use state;
FIG. 2 is a block flow diagram of a detection method provided by an embodiment of the present application;
FIG. 3 is a detailed flow chart of a detection method provided in an embodiment of the present application;
FIG. 4 is a detailed flow chart of a detection method provided in an embodiment of the present application;
fig. 5 is a block flow diagram of a cleaning method provided in an embodiment of the present application.
1-5, the reference numbers are as follows:
1-gas source; 2-a controller; 3-a first pipeline; 4-a second pipeline; 5-a first gas taking pipe; 6-a second air intake pipe; 7-DPF differential pressure sensor; 8-DPF; a1, a 2-first valve; v1, V2-second valve; k1-first interface, K2-second interface.
Detailed Description
In order to make the technical solutions of the present application better understood by those skilled in the art, the present application is further described in detail with reference to the accompanying drawings and specific embodiments.
A DPF (Diesel Particulate Filter) is a device installed in an exhaust system of a Diesel vehicle for reducing Particulate matter in exhaust gas by filtering. Between DPF differential pressure sensor and the upper reaches of DPF, and between DPF differential pressure sensor and the low reaches of DPF, one is connected with first air intaking pipe, and the other is connected with the second air intaking pipe, that is to say, DPF differential pressure sensor is connected with DPF upper reaches and low reaches respectively through two air intaking pipes (first air intaking pipe and second air intaking pipe) for the pressure differential of sensing DPF upper reaches and low reaches, and can judge according to pressure differential whether DPF blocks up or is removed.
Specifically, the direction of the air flow in the DPF8 is shown by an arrow in fig. 1, the upstream is a side facing the upstream of the air flow, the downstream is a side facing the downstream of the air flow, the first intake pipe 5 is connected to the upstream of the DPF8, and the second intake pipe 6 is connected to the downstream of the DPF8, or the first intake pipe 5 may be connected to the downstream of the DPF8, and the second intake pipe 6 may be connected to the upstream of the DPF8, which is not particularly limited.
The embodiment of the application provides a clean detection device for get trachea to DPF pressure differential sensor 7 and detect and clean, be convenient for discover get trachea's trouble and can clean getting the trachea, avoid because get trachea reasons such as trouble, influence DPF pressure differential sensor 7's testing result, and then guarantee DPF 8's the accuracy of upstream and downstream pressure differential testing result.
Specifically, as shown in fig. 1, the cleaning detection device includes an air source 1, a controller 2, a valve member first pipeline 3 and a second pipeline 4. A first interface K1 is arranged at one end of the first air taking pipe 5 facing the DPF differential pressure sensor 7, the first pipeline 3 is communicated between the air source 1 and the first interface K1, and the air source 1 can ventilate the first air taking pipe 5 through the first pipeline 3; one end of the second air taking pipe 6, which faces the DPF pressure difference sensor 7, is provided with a second interface K2, the second pipeline 4 is communicated between the air source 1 and the second interface K2, and the air source 1 can ventilate the second air taking pipe 6 through the second pipeline 4.
The valve component comprises two first valves and two second valves, wherein the two first valves are respectively and correspondingly arranged on the first gas taking pipe 5 and the second gas taking pipe 6 and used for controlling the on-off of the gas taking pipes, and the two second valves are respectively and correspondingly arranged on the first pipeline 3 and the second pipeline 4 and used for controlling the on-off of the pipelines.
As shown in fig. 1, the two first valves are a first valve a1 and a first valve a2, respectively, wherein the first valve a1 is disposed on the first gas intake pipe 5, the first valve a2 is disposed on the second gas intake pipe 6, the two second valves are a second valve V1 and a second valve V2, respectively, the second valve V1 is disposed on the first pipeline 3, and the second valve V2 is disposed on the second pipeline 4. The controller 2 is configured to control opening and closing of the valves (including the first valve a1, the first valve a2, the second valve V1, and the second valve V2).
In fig. 1, the black and thick lines are illustrated as pipes, wherein the portion inside the dotted line is an air intake pipe, and the thin and solid lines connected between the controller 2 and the valves are illustrated as electrical connection lines, specifically, how the controller 2 is connected to the valves through the electrical connection lines to control the opening and closing of the valves.
The clean detection device that this embodiment provided can detect getting the trachea at last electricity initial stage, and is concrete, 1 accessible pipeline of air supply with get the trachea intercommunication to through the break-make of four valve control two pipes of getting trachea and two pipelines in order to reach different detection state, combine DPF pressure differential sensor 7 to detect the result of pressure differential under different detection state, judge and get the trachea and break down, so that in time the troubleshooting, avoid because get the accuracy that trachea trouble influences the testing result.
This clean detection device still can sweep the cleanness to getting the trachea after stopping, and is specific, and the high-pressure compressed air of air supply 1 can sweep getting the trachea through the pipeline to will get in the trachea because of the liquid or gaseous state water, matters such as soot that the engine operation produced blow off, avoid getting ponding or impurity production jam in the trachea, thereby reduce the probability of getting the trachea and breaking down.
The cleaning detection device is simple in overall structure, small in overall size, free of occupying more space and low in cost.
Based on the above cleaning detection device, the present embodiment further provides a detection method for detecting whether the gas intake pipe of the DPF differential pressure sensor 7 is faulty.
Specifically, as shown in fig. 2, the detection method includes the following steps:
s1: the first gas taking pipe 5 is used as a pipe to be detected, the second gas taking pipe 6 is used as a matching pipe, a first valve A2 arranged on the second gas taking pipe 6 keeps an opening state, and a second valve V2 arranged on the second pipeline 4 keeps a closing state;
s2: the opening and closing of a first valve of a pipe to be detected and a second valve of a pipeline connected with the pipe to be detected are adjusted to achieve different states, and the pressure difference delta P detected by the DPF pressure difference sensor 7 in different states is recorded;
s3: judging whether the pipe to be detected has a fault or not by analyzing the pressure difference delta P of the valve component in different states;
s4: the second gas taking pipe 6 is used as a pipe to be detected, the first gas taking pipe 5 is used as a matching pipe, a first valve A1 arranged on the first gas taking pipe 5 keeps an opening state, and a second valve V1 arranged on the first pipeline 3 keeps a closing state;
s5: and detecting whether the pipe to be detected is in fault according to the steps S2-S3.
Specifically, when the gas intake pipe is detected by the cleaning detection device according to the above detection method, the first gas intake pipe 5 and the second gas intake pipe 6 are separately detected, in step S1, the first gas intake pipe 5 is used as a pipe to be detected, and the second gas intake pipe 6 is used as a matching pipe, at this time, the first valve a2 provided in the second gas intake pipe 6 is opened, the second valve V2 provided in the second pipeline 4 is closed, and during the detection of the first gas intake pipe 5, the states of the first valve a2 and the second valve V2 are not changed, so as to match the detection of the first gas intake pipe 5.
In step S2, the controller 2 controls the opening and closing of the first valve a1 and the second valve V1 so that the respective lines are brought into different states, and records the differential pressure Δ P detected by the DPF differential pressure sensor 7 in the different states.
In step S3, the pressure difference Δ P detected in step S2 under different conditions is analyzed, and specifically, it is determined whether the first gas intake pipe 5 serving as a pipe to be detected has a fault through comparison, calculation, and the like. Thereby completing the detection operation of the first gas take-out pipe 5.
When the first gas intake pipe 5 is detected, in step S4, the first gas intake pipe 5 is used as a matching pipe, and the second gas intake pipe 6 is used as a pipe to be detected, that is, as in the setting of step S1, the roles of the first gas intake pipe 5 and the second gas intake pipe 6 are interchanged, and in the process of detecting the second gas intake pipe 6, the first valve a1 provided in the first gas intake pipe 5 is kept in an open state, and the second valve V2 provided in the first pipeline 3 is kept in a closed state, so as to match the detection of the second gas intake pipe 6.
Then, the second gas-taking tube 6 is used as the tube to be detected, and in step S5, the second gas-taking tube 6 is detected according to the above steps S2 and S3, and the specific detection process is similar to the detection of the first gas-taking tube 5, and is not described herein again for saving space.
In the following, taking the first gas intake pipe 5 as the pipe to be detected, the first gas intake pipe 5 is communicated between the DPF differential pressure sensor 7 and the upstream of the DPF8, the second gas intake pipe 6 is the matching pipe, and the second gas intake pipe 6 is communicated between the DPF differential pressure sensor 7 and the downstream of the DPF8 as an example, with reference to fig. 3 and 4, the above step S2 and step S3 will be described in detail, and according to step S1, the first valve a2 is kept open, and the second valve V2 is kept closed.
In step S2, the controller 2 controls the opening and closing of the first valve a1 and the second valve V1 to sequentially reach the following four states:
in the first state, the first valve a1 is opened, the second valve V1 is closed, and the differential pressure Δ P detected by the DPF differential pressure sensor 7 is recorded as P1.
In this state, the first valves a1 and a2 are opened, the second valves V1 and V2 are closed, the two gas intake pipes are connected, the two pipes are disconnected, and the differential pressure Δ P between the upstream and downstream of the DPF, which is detected by the DPF differential pressure sensor 7, is P1.
In the second state, the first valve a1 is closed, the second valve V1 is opened, and the differential pressure Δ P detected by the DPF differential pressure sensor 7 is recorded as P2.
In this state, the first gas intake pipe 5 is disconnected, the first pipe line 3 is connected, the second gas intake pipe 6 is connected, the second pipe line 4 is disconnected, and the differential pressure Δ P between the gas source 1 side and the downstream side of the DPF, which is detected by the DPF differential pressure sensor 7, is P2. At this time, it may be determined whether the first port K1 of the first intake pipe 5 is clogged according to step S31.
Specifically, step S31 is: and judging whether the interface of the pipe to be detected is blocked or not according to the sizes of the p1 and the p 2. Whether the first interface K1 and the second interface K2 are blocked or not is judged according to the step S31, and when the first interface K1 or the second interface K2 are blocked, an interface blocking fault prompt can be sent so as to prompt a user in time, facilitate timely maintenance and avoid influencing the accuracy of a detection result.
The air source 1 can perform back-flushing cleaning on the first air taking pipe 5 through the first pipeline 3, therefore, it is understood that p2 should be larger than p1, but if the detected result is that p2 is not larger than p1, the blockage of the first interface K1 of the first air taking pipe 5 is indicated.
In the third state, the first valve a1 is closed, the second valve V1 is closed, the first preset time T1 is waited, and the differential pressure Δ P detected by the DPF differential pressure sensor 7 is recorded as P3.
In this state, the first intake pipe 5 and the first pipeline 3 are both disconnected, the second intake pipe 6 is connected, the second pipeline 4 is disconnected, and the DPF differential pressure sensor 7 detects the differential pressure between the first valve a1 and the second valve V1 and downstream of the DPF. At this time, it is judged whether or not the first intake pipe 5 is leaking according to step S32.
Specifically, step S32 is: according to the difference between p2 and p3 and the first limit value pmaxAnd judging whether the pipe to be detected is leaked. And, after the pipe that detects the detection leakage, can send out the leakage fault suggestion to in time indicate the user, be convenient for in time maintain, avoid influencing the accuracy of testing result.
Theoretically, the pressure difference p3 detected in the third state is equal to or similar to the pressure difference p2 detected in the second state, but if the first intake pipe 5 leaks, after the first valve a1 is closed and waits for the first preset time T1, the pressure in the first intake pipe 5 becomes small due to the leakage, so that the detected pressure differences p3 and p2 are greatly different, and therefore, if the difference (absolute value) between p3 and p2 is greater than the first limit value pmaxThen, it is judged that the first intake pipe 5 leaks.
In the fourth state, the first valve a1 is opened, the second valve V1 is closed, a second preset time T2 is waited, and the differential pressure Δ P detected by the DPF differential pressure sensor 7 is recorded as P4.
In this state, the first intake pipe 5 is connected, the first pipeline 3 is disconnected, the second intake pipe 6 is connected, the second pipeline 4 is disconnected, that is, the two intake pipes are connected and the two pipelines are disconnected, and the DPF differential pressure sensor 7 detects the differential pressure between the upstream and downstream of the DPF.
At this time, can be according to the stepStep S34 is a judgment as to whether the first intake pipe 5 is clogged. Specifically, step S34 is: according to the difference between p3 and p4 and the second limit value pminAnd judging whether the pipe to be detected is blocked or not.
Compared with the third state, the fourth state is that the first valve a1 of the first intake pipe 5 is opened, after the waiting second preset time T2, the original pressure in the first intake pipe 5 is released, the DPF differential pressure sensor 7 detects the pressure difference p4 between the upstream and downstream of the DPF, but if the p4 and the p3 do not change much, if the difference (absolute value) between the p4 and the p3 is smaller than the p4 and the p3minIt means that the original pressure in the first intake pipe 5 is not released within the second preset time T2, that is, the first intake pipe 5 is blocked.
That is, the failure of the gas intake pipe includes a port blockage failure, a leakage failure, and a blockage failure, and at least one of the above steps S31, S32, and S33 may be included in the above step S3 to determine whether the pipe to be detected has a failure.
As shown in fig. 3 and 4, between step S33 and step S4, the following steps are further included:
s34: if the pipe to be detected is blocked, opening a first valve of the pipe to be detected, and repeatedly opening and closing a second valve of a pipeline connected with the pipe to be detected until the pipe to be detected is not blocked according to the judgment in the step S33;
s35: and if the second valve of the pipeline connected with the pipe to be detected is repeatedly opened and closed for a preset number of times and the pipe to be detected is still blocked according to the judgment in the step S33, a blocking fault prompt is sent.
That is, if it is determined in step S33 that the first gas intake pipe 5 is clogged, in step S34, the first valve a1 is opened, and the second valve V1 is repeatedly opened and closed, and when the second valve V1 is opened, the gas source 1 can communicate with the first gas intake pipe 5 through the first pipeline 3, so as to perform reverse purging on the first gas intake pipe 5, clean the first pipeline 3, and dredge the clogging in the first pipeline 3. When the second valve V1 is closed, the fourth state is reached, the DPF differential pressure sensor 7 detects the differential pressure Δ P as P4 in real time, and determines whether the first gas intake pipe 5 is blocked according to the step S33, if the first gas intake pipe 5 is not blocked, the gas source 1 performs reverse purging through the first pipeline 3, and flushes the blocked part of the first gas intake pipe 5, so that the first gas intake pipe 5 is cleaned, and then purging is not required. However, if the second valve V1 is repeatedly opened and closed for the preset number of times N, and it is determined through the step S33 that the first gas intake pipe 5 is still blocked, the purging is stopped, and a blocking fault prompt of the first gas intake pipe 5 is sent, so as to prompt the user in time, facilitate the maintenance in time, and avoid affecting the accuracy of the detection result.
In the above embodiment, before the step S1, the method further includes the step S0: the engine is started. That is, the detection method is performed in a state where the engine is running.
Based on the above cleaning detection device, the present embodiment also provides a cleaning method for cleaning the gas intake pipe of the DPF differential pressure sensor 7.
Specifically, as shown in fig. 5, the cleaning method includes the following steps:
s100: and judging whether the engine is in an idling state and meets a preset requirement.
The air intake pipe is cleaned when the engine is in an idle state, so that the influence on the detection of the DPF differential pressure sensor 7 is reduced. The preset requirement may be set according to actual conditions, and in this embodiment, the preset requirement is whether the current driving cycle operation time exceeds a preset limit T, so as to clean the air intake pipe regularly.
S200: after the valves are simultaneously opened for a preset time by the controller 2, the second valves are closed.
The valves (including the first valves a1, a2 and the second valves V1, V2) are opened simultaneously by the controller 2, the gas source 1 can purge the first gas taking pipe 5 through the first pipeline 3 and purge the second gas taking pipe 6 through the second pipeline 4, after the preset purging time t, the second valves V1, V2 are closed (at this time, the first valves a1, a2 can be closed or not closed), and the purging is stopped.
S300: and repeating the step S200 until the preset times are reached or the engine speed is 0.
In step S200, the valves are opened simultaneously, and after the purging for the preset time t, the second valves V1 and V2 are closed. That is, the purging operation is repeated for each gas intake pipe until the number of purges reaches the preset number M or the engine speed is 0, that is, in the repeated purging process, if the engine speed is 0, purging is stopped at any time, and if the engine speed is not 0 all the time, purging is stopped after the preset number M of purges.
Between step S100 and step S200, step S110 is further included: latching the DPF differential pressure sensor 7 signal. The DPF pressure difference sensor 7 detects the pressure difference between the upstream and the downstream of the DPF in real time, and the signal of the DPF pressure difference sensor 7 is latched before purging, so that the conditions that the vehicle-mounted diagnosis system reports errors and triggers the performance limitation of the engine and the like due to large influence on the detection result of the pressure difference in the purging process can be avoided.
In this embodiment, the air supply 1 is the whole vehicle air tank, and certainly also can set up the air supply 1 alone, and when forming the air supply 1 through whole vehicle air tank, can further simplify overall structure to reduce whole occupation space, reduce cost, improve economic nature.
The foregoing is only a preferred embodiment of the present application and it should be noted that those skilled in the art can make several improvements and modifications without departing from the principle of the present application, and these improvements and modifications should also be considered as the protection scope of the present application.

Claims (10)

1. A cleaning detection device is used for detecting and cleaning an air intake pipe of a DPF pressure difference sensor and is characterized by comprising an air source, a controller, a valve component, a first pipeline and a second pipeline;
one of the DPF pressure difference sensor and the upstream of the DPF and the DPF pressure difference sensor and the downstream of the DPF is connected with a first air intake pipe, and the other one of the DPF pressure difference sensor and the downstream of the DPF is connected with a second air intake pipe, wherein one end of the first air intake pipe facing the DPF pressure difference sensor is provided with a first interface, and one end of the second air intake pipe facing the DPF pressure difference sensor is provided with a second interface;
the first pipeline is communicated between the gas source and the first interface, and the second pipeline is communicated between the gas source and the second interface;
the valve component comprises first valves respectively arranged on the first gas taking pipe and the second gas taking pipe, and second valves respectively arranged on the first pipeline and the second pipeline, and the controller is used for controlling the opening and closing of the valves.
2. The cleaning detection device of claim 1, wherein the air supply is a full vehicle air tank.
3. A detection method based on the cleaning detection device of claim 1 or 2, for detecting an intake pipe of a DPF differential pressure sensor; the detection method is characterized by comprising the following steps:
s1: taking a first gas taking pipe as a pipe to be detected, taking a second gas taking pipe as a matching pipe, keeping a first valve arranged on the second gas taking pipe in an opening state, and keeping a second valve arranged on the second pipeline in a closing state;
s2: controlling the opening and closing of a first valve of a pipe to be detected and a second valve of a pipeline connected with the pipe to be detected through a controller so as to reach different states, and recording the pressure difference delta P detected by the DPF pressure difference sensor in different states;
s3: judging whether the pipe to be detected has a fault or not by analyzing the pressure difference delta P in different states;
s4: taking the second gas taking pipe as a pipe to be detected, taking the first gas taking pipe as a matching pipe, keeping a first valve arranged in the first gas taking pipe in an opening state, and keeping a second valve arranged in the first pipeline in a closing state;
s5: and detecting whether the pipe to be detected has a fault or not according to the steps S2-S3.
4. The detection method according to claim 3,
in step S2, the following four states are sequentially achieved by adjusting the first valve of the pipe to be detected and the second valve of the pipeline connected to the pipe to be detected:
in the first state, a first valve of a pipe to be detected is opened, a second valve of a pipeline connected with the pipe to be detected is closed, and differential pressure delta P detected by a DPF differential pressure sensor is recorded as P1;
in the second state, the first valve of the pipe to be detected is closed, the second valve of the pipeline connected with the pipe to be detected is opened, and the pressure difference delta P detected by the DPF pressure difference sensor is recorded as P2;
in the third state, a first valve of a pipe to be detected is closed, a second valve of a pipeline connected with the pipe to be detected is closed, a first preset time is waited, and the pressure difference delta P detected by the DPF pressure difference sensor is recorded as P3;
in the fourth state, a first valve of a pipe to be detected is opened, a second valve of a pipeline connected with the pipe to be detected is closed, a second preset time is waited, and the pressure difference delta P detected by the DPF pressure difference sensor is recorded as P4;
in step S3, by analyzing the pressure differences Δ P in different states, it is determined whether the pipe to be detected has a fault, and the method specifically includes at least one of the following steps:
s31: judging whether the interface of the pipe to be detected is blocked or not according to the sizes of p1 and p 2;
s32: according to the difference between p2 and p3 and the first limit value pmaxJudging whether the pipe to be detected leaks or not;
s33: according to the difference between p3 and p4 and a second limit value pminAnd judging whether the pipe to be detected is blocked or not.
5. The detection method according to claim 4, wherein in step S31, if the interface of the pipe to be detected is blocked, an interface blockage fault prompt is sent;
in step S32, if the pipe to be detected leaks, a leakage failure prompt is issued.
6. The detection method according to claim 4,
the following steps are also included between step S33 and step S4:
s34: if the pipe to be detected is blocked, opening a first valve of the pipe to be detected, and repeatedly opening and closing a second valve of the pipeline connected with the pipe to be detected until the pipe to be detected is not blocked according to the judgment in the step S33;
s35: and if the second valve of the pipeline connected with the pipe to be detected is repeatedly opened and closed for a preset number of times and the pipe to be detected is still blocked according to the judgment in the step S33, a blocking fault prompt is sent.
7. The detecting method according to claim 3, wherein step S1 is preceded by step S0: the engine is started.
8. A cleaning method based on the cleaning detection device of claim 1 or 2 for cleaning the gas intake pipe of the DPF differential pressure sensor; characterized in that the cleaning method comprises the following steps:
s100: judging whether the engine is in an idling state and meets a preset requirement;
s200: after the valves are opened simultaneously for a preset time through the controller, closing the second valves;
s300: and repeating the step S200 until the preset times are reached or the engine speed is 0.
9. The cleaning method according to claim 8, wherein in step S100, the preset requirement is whether a current driving cycle running time exceeds a preset limit.
10. The cleaning method according to claim 8, wherein between step S100 and step S200, further comprising step S110: latching the DPF differential pressure sensor signal.
CN202210254831.6A 2022-03-15 2022-03-15 Cleaning detection device, detection method and cleaning method Pending CN114705381A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210254831.6A CN114705381A (en) 2022-03-15 2022-03-15 Cleaning detection device, detection method and cleaning method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210254831.6A CN114705381A (en) 2022-03-15 2022-03-15 Cleaning detection device, detection method and cleaning method

Publications (1)

Publication Number Publication Date
CN114705381A true CN114705381A (en) 2022-07-05

Family

ID=82168288

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210254831.6A Pending CN114705381A (en) 2022-03-15 2022-03-15 Cleaning detection device, detection method and cleaning method

Country Status (1)

Country Link
CN (1) CN114705381A (en)

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020116986A1 (en) * 2000-12-22 2002-08-29 Pompa Juan Rogelio Method and apparatus for locating leaks in pipelines
EP1316693A1 (en) * 2001-11-29 2003-06-04 Renault s.a.s. Method and device for diagnosing the operational condition of an exhaust gas line of an internal combustion engine
KR20060003540A (en) * 2004-07-06 2006-01-11 현대자동차주식회사 Exhaust gas recirculation cooler regeneration controlling method
CN102192020A (en) * 2010-02-11 2011-09-21 通用汽车环球科技运作有限责任公司 Restricted filter diagnostic system and method
JP2011191278A (en) * 2010-03-17 2011-09-29 Hitachi Automotive Systems Ltd Pressure sensor
FR2969287A1 (en) * 2010-12-17 2012-06-22 Alcatel Lucent LEAK DETECTION DEVICE USING HYDROGEN AS TRACER GAS
JP2013174492A (en) * 2012-02-24 2013-09-05 Denso Corp Inspection device and inspection method
KR20180091440A (en) * 2017-02-07 2018-08-16 현대자동차주식회사 System and method for diagnosing fault of fuel leakage detector
CN110849605A (en) * 2019-11-18 2020-02-28 中国重汽集团济南动力有限公司 Particle catcher fault simulation device, method for judging blocking fault degree and method for removing fault degree
CN111980790A (en) * 2020-08-17 2020-11-24 联合汽车电子有限公司 Fault diagnosis method and device for particulate matter trap, automobile and computer readable storage medium
CN113227746A (en) * 2018-12-28 2021-08-06 贝克曼库尔特有限公司 Pneumatic system with advanced system diagnostic capability
CN113348350A (en) * 2019-01-28 2021-09-03 奥布拉马提克股份公司 Method for detecting a leak in a pipeline system and control system for carrying out the method
CN113818948A (en) * 2021-09-22 2021-12-21 潍柴动力股份有限公司 Diesel particulate filter control device and control method

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020116986A1 (en) * 2000-12-22 2002-08-29 Pompa Juan Rogelio Method and apparatus for locating leaks in pipelines
EP1316693A1 (en) * 2001-11-29 2003-06-04 Renault s.a.s. Method and device for diagnosing the operational condition of an exhaust gas line of an internal combustion engine
KR20060003540A (en) * 2004-07-06 2006-01-11 현대자동차주식회사 Exhaust gas recirculation cooler regeneration controlling method
CN102192020A (en) * 2010-02-11 2011-09-21 通用汽车环球科技运作有限责任公司 Restricted filter diagnostic system and method
JP2011191278A (en) * 2010-03-17 2011-09-29 Hitachi Automotive Systems Ltd Pressure sensor
FR2969287A1 (en) * 2010-12-17 2012-06-22 Alcatel Lucent LEAK DETECTION DEVICE USING HYDROGEN AS TRACER GAS
JP2013174492A (en) * 2012-02-24 2013-09-05 Denso Corp Inspection device and inspection method
KR20180091440A (en) * 2017-02-07 2018-08-16 현대자동차주식회사 System and method for diagnosing fault of fuel leakage detector
CN113227746A (en) * 2018-12-28 2021-08-06 贝克曼库尔特有限公司 Pneumatic system with advanced system diagnostic capability
CN113348350A (en) * 2019-01-28 2021-09-03 奥布拉马提克股份公司 Method for detecting a leak in a pipeline system and control system for carrying out the method
CN110849605A (en) * 2019-11-18 2020-02-28 中国重汽集团济南动力有限公司 Particle catcher fault simulation device, method for judging blocking fault degree and method for removing fault degree
CN111980790A (en) * 2020-08-17 2020-11-24 联合汽车电子有限公司 Fault diagnosis method and device for particulate matter trap, automobile and computer readable storage medium
CN113818948A (en) * 2021-09-22 2021-12-21 潍柴动力股份有限公司 Diesel particulate filter control device and control method

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
刘浩;王贤成;陈俊华;沈萌红;朱文斌;: "基于外压压差法高压阀门气密性检测系统研究", 机床与液压, no. 01, 15 January 2015 (2015-01-15), pages 53 - 56 *
戴金池;庞海龙;俞妍;卜建国;资新运;: "柴油车DPF系统的OBD故障诊断策略研究", 车用发动机, no. 01, 25 February 2020 (2020-02-25), pages 85 - 90 *
牟洁姝: "柴油机颗粒捕集器再生控制系统仿真及控制策略设计", 中国优秀硕士学位论文全文数据库工程科技Ⅱ辑, no. 03, 15 March 2017 (2017-03-15), pages 039 - 344 *
王欣伟 等: "柴油机DPF系统失效故障特征分析", 兵器装备工程学报, vol. 43, no. 02, 25 February 2022 (2022-02-25), pages 229 - 234 *

Similar Documents

Publication Publication Date Title
CN107420230B (en) Carbon tank high-load desorption pipeline desorption flow diagnosis method
JP3542659B2 (en) Fuel vapor gas leak detector
JP3319125B2 (en) Evaporative fuel treatment system for internal combustion engine
JPH06502006A (en) Tank exhaust system and motor vehicle equipped with a tank exhaust system, as well as method and device for testing the functionality of a tank exhaust system
US5363828A (en) Fuel vapor processing apparatus of internal combustion engine
JP4640133B2 (en) Evaporative fuel treatment device leak diagnosis device
US6089080A (en) Diagnosis apparatus for evaporation system
JPH0835452A (en) Diagnostic method for evaporation purge system
JPH11316171A (en) Inspection method for functionality of tank aerator in vehicle
JP2004156498A (en) Evaporated fuel treatment device of internal combustion engine
KR100927752B1 (en) Tank leak diagnosis method and apparatus using reference measurement method
US11047760B2 (en) Tank venting system for a motor vehicle as well as motor vehicle and method for operating a tank venting system
WO2012016540A1 (en) Auto inspection method for inkjet printer negative pressure system
US6886399B2 (en) Method for determining mass flows into the inlet manifold of an internal combustion engine
CN114705381A (en) Cleaning detection device, detection method and cleaning method
US20150025781A1 (en) Canister purge valve leak detection system
US20220205414A1 (en) Method and Device for Diagnosing a Ventilation Line of an Internal Combustion Engine Fuel Tank
JPH07119559A (en) Controller for internal combustion engine
KR100385750B1 (en) Evaperative system leak check by underpressure after engine stop
CN201089795Y (en) Reversing arrangement having shut unclosed prompt facility
CN113047972A (en) Leak diagnosis system, leak diagnosis method, and vehicle including leak diagnosis system
CN113417767A (en) Positive pressure type desorption pipeline flow diagnosis method based on fuel tank leakage diagnosis module
CN114251199B (en) Carbon tank desorption pipeline diagnosis method, controller and engine
KR20070037251A (en) Method for detecting error of pressure sensor in fuel tank for car
CN214403796U (en) Carbon tank desorption system and pipe joint blockage diagnostic device and vehicle thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination