CN114705381B - Cleaning detection device, detection method and cleaning method - Google Patents
Cleaning detection device, detection method and cleaning method Download PDFInfo
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- CN114705381B CN114705381B CN202210254831.6A CN202210254831A CN114705381B CN 114705381 B CN114705381 B CN 114705381B CN 202210254831 A CN202210254831 A CN 202210254831A CN 114705381 B CN114705381 B CN 114705381B
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- 238000001514 detection method Methods 0.000 title claims abstract description 64
- 238000004140 cleaning Methods 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000011144 upstream manufacturing Methods 0.000 claims description 15
- 230000000903 blocking effect Effects 0.000 claims description 7
- 238000005259 measurement Methods 0.000 abstract description 6
- 238000003745 diagnosis Methods 0.000 abstract description 3
- 238000010926 purge Methods 0.000 description 17
- 230000001276 controlling effect Effects 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000013618 particulate matter Substances 0.000 description 2
- 239000004071 soot Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
Classifications
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- 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
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- 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Exhaust Gas After Treatment (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 a gas taking pipe of a DPF differential pressure sensor, wherein the cleaning detection device comprises a gas source, a controller, a valve component, 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 a first valve respectively arranged on each gas taking pipe and a second valve respectively arranged on each pipeline, and the controller is used for controlling the opening and closing of each valve. Through detecting and cleaning the gas taking pipe, the accuracy of the measurement result of the DPF differential pressure sensor can be ensured, and the leakage and blockage of the gas taking pipe are prevented from directly influencing the measurement of the DPF differential pressure sensor, so that the vehicle-mounted diagnosis system is caused to report errors and trigger the engine performance limitation.
Description
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 a gas taking pipe of a DPF differential pressure sensor.
Background
DPF (Diesel Particulate Filter, diesel particulate filter trap) is installed in diesel vehicle exhaust system, reduces the device of particulate matter in the exhaust through filtering, and DPF differential pressure sensor is as discharging relevant important sensor, is connected with DPF upstream and downstream through two gas taking pipe respectively to the differential pressure around the sensing DPF.
Leakage and blockage of the air intake pipe will directly affect the measurement of the DPF differential pressure sensor, which in turn leads to a false alarm of the on-board diagnostic system and triggers engine performance limitations.
Therefore, how to detect and clean the gas taking pipe of the DPF differential pressure sensor, and avoid the influence of leakage and blockage faults of the gas taking pipe on the accuracy of the measurement result of the DPF differential pressure sensor is a technical problem to be solved by the person skilled in the art.
Disclosure of Invention
The application aims to provide a cleaning detection device, a detection method and a cleaning method, which are used for detecting and cleaning an air taking pipe of a DPF differential pressure sensor, ensuring the accuracy of the measurement result of the DPF differential pressure sensor, and avoiding that the leakage and blockage of the air taking pipe directly affect the measurement of the DPF differential pressure sensor, thereby causing the error reporting of a vehicle-mounted diagnosis system and triggering the performance limitation of an engine.
In order to solve the technical problems, the application provides a cleaning detection device which is used for detecting and cleaning an air taking 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 differential pressure sensor and the upstream of the DPF and the DPF differential pressure sensor and the downstream of the DPF is connected with a first air taking pipe, the other one of the DPF differential pressure sensor and the DPF differential pressure sensor is connected with a second air taking pipe, a first interface is arranged at one end of the first air taking pipe, which faces the DPF differential pressure sensor, and a second interface is arranged at one end of the second air taking pipe, which faces the DPF differential pressure sensor; the first pipeline is communicated between the air source and the first interface, and the second pipeline is communicated between the air source and the second interface; the valve component comprises a first valve arranged on the first air taking pipe and the second air taking pipe respectively, and a second valve arranged on the first pipeline and the second pipeline respectively, and the controller is used for controlling the opening and closing of each valve.
Optionally, the air source is a whole air 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, and keeping a first valve arranged on the second gas taking pipe in an open state and keeping a second valve arranged on the second pipeline in a closed state;
s2: the method comprises the steps of 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 achieve different states, and recording the differential pressure delta P detected by a DPF differential pressure sensor in different states;
S3: judging whether the pipe to be detected has faults or not by analyzing the differential pressure delta P under different states;
S4: taking the second gas taking pipe as a pipe to be detected, taking the first gas taking pipe as a matched pipe, and keeping a first valve arranged on the first gas taking pipe in an open state and keeping a second valve arranged on the first pipeline in a closed state;
s5: and detecting whether the pipe to be detected has faults or not according to the steps S2-S3.
Optionally, in step S2, 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, the following four states are sequentially reached:
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 the differential pressure DeltaP=p1 detected by a DPF differential pressure sensor is recorded;
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 differential pressure DeltaP=p2 detected by the DPF differential pressure sensor is recorded;
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 differential pressure deltaP=p3 detected by a DPF differential pressure sensor is recorded;
in a 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 differential pressure deltaP=p4 detected by a DPF differential pressure sensor is recorded;
In step S3, by analyzing the differential pressure Δp in different states, it is determined whether the pipe to be detected has a fault, and 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: judging whether the pipe to be detected leaks or not according to the difference value between p2 and p3 and the first limit value p max;
S33: and judging whether the pipe to be detected is blocked or not according to the difference value between p3 and p4 and the second limit value p min.
Optionally, in step S31, if the interface of the pipe to be detected is blocked, a fault prompt of blocking the interface is sent out;
In step S32, if the pipe to be detected leaks, a leakage fault prompt is sent.
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 judged not to be blocked according to the step S33;
s35: 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 S0 is further included before step S1: the engine is started.
The application also provides a cleaning method based on the cleaning detection device, which 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 idle state and reaches a preset requirement;
S200: simultaneously opening all the valves to a preset time through a controller, and closing all the second valves;
S300: step S200 is repeated until the preset number of times or the engine speed is 0.
Optionally, in step S100, the preset requirement is whether the current driving cycle running time exceeds a preset limit value.
Optionally, between step S100 and step S200, step S110 is further included: the DPF differential pressure sensor signal is latched.
The cleaning detection device can detect the gas taking pipe at the initial stage of power-on, and specifically, the gas source can be communicated with the gas taking pipe through the pipeline, and the two gas taking pipes and the on-off of the two pipelines are controlled through four valves so as to achieve different detection states, and the result of the pressure difference detected by the DPF pressure difference sensor under the different detection states is combined to judge whether the gas taking pipe breaks down, so that the fault can be removed in time, and the accuracy of the detection result is prevented from being influenced by the fault of the gas taking pipe.
The cleaning detection device can also sweep and clean the gas taking pipe after stopping, and specifically, high-pressure compressed air of the air source can sweep the gas taking pipe through the pipeline so as to blow out liquid or gaseous water, soot and other substances generated by the operation of the engine in the gas taking pipe, avoid blockage caused by ponding or impurities in the gas taking pipe, and further reduce the probability of failure of the gas taking pipe.
The cleaning detection device has the advantages of simple integral structure, small integral volume, no need of occupying more space and low cost.
The detection method is based on the cleaning detection device for detecting the air taking pipe of the DPF differential pressure sensor, the cleaning method is based on the cleaning detection device for cleaning the air taking pipe of the DPF differential pressure sensor, the technical effects of the detection method and the cleaning method are similar to those of the cleaning detection device, and the description is omitted for saving the space.
Drawings
FIG. 1 is a schematic view of a cleaning detection device according to an embodiment of the present application in a use state;
FIG. 2 is a block flow diagram of a detection method according to an embodiment of the present application;
FIG. 3 is a detailed flow chart of the detection method according to the embodiment of the present application;
FIG. 4 is a detailed flow chart of the detection method provided by the embodiment of the application;
fig. 5 is a block flow diagram of a cleaning method according to an embodiment of the present application.
Fig. 1 to 5, the reference numerals are as follows:
1-an air source; 2-a controller; 3-a first pipeline; 4-a second pipeline; 5-a first air taking pipe; 6-a second air taking pipe; 7-DPF differential pressure sensor; 8-DPF; a1 and A2 are the first valves; v1, V2-second valve; k1-first interface, K2-second interface.
Detailed Description
In order to make the technical solution of the present application better understood by those skilled in the art, the present application will be further described in detail with reference to the accompanying drawings and specific embodiments.
A DPF (Diesel Particulate Filter ) is a device installed in the exhaust system of a diesel vehicle to reduce particulate matter in the exhaust gas by filtering. One is connected with a first air taking pipe, and the other is connected with a second air taking pipe, that is, the DPF differential pressure sensor is respectively connected with the upstream and the downstream of the DPF through two air taking pipes (the first air taking pipe and the second air taking pipe) for sensing the differential pressure between the upstream and the downstream of the DPF and judging whether the DPF is blocked or removed according to the differential pressure.
Specifically, as indicated by the arrow in fig. 1, the upstream direction refers to the upstream side of the air flow, the downstream direction refers to the downstream side of the air flow, the first air taking pipe 5 is connected to the upstream side of the DPF8, the second air taking pipe 6 is connected to the downstream side of the DPF8, or the first air taking pipe 5 may be connected to the downstream side of the DPF8, and the second air taking pipe 6 may be connected to the upstream side of the DPF 8.
The embodiment of the application provides a cleaning detection device which is used for detecting and cleaning a gas taking pipe of a DPF differential pressure sensor 7, is convenient for finding out the fault of the gas taking pipe and cleaning the gas taking pipe, and avoids influencing the detection result of the DPF differential pressure sensor 7 due to the fault of the gas taking pipe and other reasons, thereby ensuring the accuracy of the detection result of the upstream and downstream differential pressure of a DPF 8.
Specifically, as shown in fig. 1, the cleaning detection device includes an air source 1, a controller 2, a valve member first pipe 3, and a second pipe 4. One end of the first gas taking pipe 5, which faces the DPF differential pressure sensor 7, is provided with a first interface K1, a first pipeline 3 is communicated between the gas source 1 and the first interface K1, and the gas source 1 can ventilate to the first gas taking pipe 5 through the first pipeline 3; the second air taking pipe 6 is provided with a second interface K2 towards one end of the DPF differential pressure sensor 7, the second pipeline 4 is communicated between the air source 1 and the second interface K2, and the air source 1 can ventilate to 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 air taking pipe 5 and the second air taking pipe 6 and are used for controlling the on-off of the air taking pipe, and the two second valves are respectively and correspondingly arranged on the first pipeline 3 and the second pipeline 4 and are 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, where the first valve A1 is disposed on the first air intake pipe 5, the first valve A2 is disposed on the second air intake pipe 6, and the two second valves are a second valve V1 and a second valve V2, where 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 used for controlling the 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 thick and thick lines are schematically indicated as pipelines, wherein the portions in the dashed lines are gas taking pipes, the thin solid lines connected between the controller 2 and each valve are schematically indicated as electrical connection lines, and specifically, how the controller 2 is connected to each valve through the electrical connection lines to control the opening and closing of each valve, which is well known to those skilled in the art, and is not described herein for saving space.
The cleaning detection device provided by the embodiment can detect the gas taking pipe at the initial stage of power-on, specifically, the gas source 1 can be communicated with the gas taking pipe through the pipeline, and the two gas taking pipes and the on-off of the two pipelines are controlled through four valves so as to achieve different detection states, and the result of the pressure difference detected by the DPF differential pressure sensor 7 under the different detection states is combined to judge whether the gas taking pipe fails, so that the failure can be removed in time, and the accuracy of the detection result is prevented from being influenced by the failure of the gas taking pipe.
The cleaning detection device can also sweep and clean the gas taking pipe after stopping, and specifically, the high-pressure compressed air of the air source 1 can sweep the gas taking pipe through the pipeline so as to blow out liquid or gaseous water, soot and other substances generated by the operation of the engine in the gas taking pipe, avoid the blockage caused by ponding or impurities in the gas taking pipe, and further reduce the probability of failure of the gas taking pipe.
The cleaning detection device has the advantages of simple integral structure, small integral volume, no need of occupying more space and low cost.
Based on the above-described cleaning detection device, the present embodiment also provides a detection method for detecting whether the air intake pipe of the DPF differential pressure sensor 7 has failed.
Specifically, as shown in fig. 2, the detection method includes the following steps:
S1: taking the first air taking pipe 5 as a pipe to be detected, taking the second air taking pipe 6 as a matched pipe, and keeping a first valve A2 arranged on the second air taking pipe 6 in an open state and keeping a second valve V2 arranged on the second pipeline 4 in a closed state;
s2: the first valve of the pipe to be detected and the second valve of the pipeline connected with the pipe to be detected are regulated to be opened and closed so as to achieve different states, and the differential pressure delta P detected by the DPF differential pressure sensor 7 under different states is recorded;
S3: judging whether the pipe to be detected has faults or not by analyzing the differential pressure delta P of the valve component in different states;
s4: taking the second air taking pipe 6 as a pipe to be detected, taking the first air taking pipe 5 as a matched pipe, and keeping a first valve A1 arranged on the first air taking pipe 5 in an open state and keeping a second valve V1 arranged on the first pipeline 3 in a closed state;
s5: and detecting whether the pipe to be detected has faults or not according to the steps S2-S3.
In detail, when the air taking pipe is detected by the cleaning detection device according to the detection method, the detection of the first air taking pipe 5 and the second air taking pipe 6 are respectively and independently performed, in the step S1, the first air taking pipe 5 is used as a pipe to be detected, the second air taking pipe 6 is used as a matched pipe, at the moment, the first valve A2 arranged on the second air taking pipe 6 is opened, the second valve V2 arranged on the second pipeline 4 is closed, and in the process of detecting the first air taking pipe 5, the states of the first valve A2 and the second valve V2 are unchanged so as to match to detect the first air taking 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 each pipeline reaches different states, and the differential pressure Δp detected by the DPF differential pressure sensor 7 is recorded in the different states.
In step S3, the pressure difference Δp detected in the different states in step S2 is analyzed, and specifically, whether the first gas taking tube 5 serving as the tube to be detected is faulty or not may be determined by comparison, calculation, or the like. Thereby completing the detection operation of the first air taking pipe 5.
After the detection of the first air taking pipe 5 is completed, in step S4, the first air taking pipe 5 is used as a matching pipe, and the second air taking pipe 6 is used as a pipe to be detected, that is, the roles of the first air taking pipe 5 and the second air taking pipe 6 are interchanged as in the setting of step S1, in the process of detecting the second air taking pipe 6, the first valve A1 arranged on the first air taking pipe 5 is kept in an open state, and the second valve V2 arranged on the first pipeline 3 is kept in a closed state so as to match with the detection of the second air taking pipe 6.
Then, in step S5, the second air taking tube 6 is detected according to the above steps S2 and S3, and the specific detection process is similar to that of the first air taking tube 5, so that the description is omitted for saving space.
In the following, the first air taking pipe 5 is taken as a pipe to be detected, the first air taking pipe 5 is communicated between the DPF differential pressure sensor 7 and the upstream of the DPF8, the second air taking pipe 6 is a matched pipe, and the second air taking pipe 6 is communicated between the DPF differential pressure sensor 7 and the downstream of the DPF8, and the above-mentioned steps S2 and S3 will be described in detail with reference to fig. 3 and 4, 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 achieve the following four states:
In the first state, the first valve A1 is opened, the second valve V1 is closed, and the differential pressure Δp=p1 detected by the DPF differential pressure sensor 7 is recorded.
In this state, the first valves A1 and A2 are opened, the second valves V1 and V2 are closed, the two gas taking pipes are connected, the two pipes are disconnected, and the DPF differential pressure sensor 7 detects the differential pressure Δp=p1 between the upstream and downstream of the DPF.
In the second state, the first valve A1 is closed, the second valve V1 is opened, and the differential pressure Δp=p2 detected by the DPF differential pressure sensor 7 is recorded.
In this state, the first gas intake pipe 5 is disconnected, the first pipe 3 is connected, the second gas intake pipe 6 is connected, the second pipe 4 is disconnected, and the DPF differential pressure sensor 7 detects the differential pressure Δp=p2 between the gas source 1 side and the downstream of the DPF. At this time, it may be determined whether or not the first port K1 of the first air intake pipe 5 is blocked 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 p1 and p 2. Namely, 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 is blocked, an interface blocking fault prompt can be sent out so as to prompt a user in time, facilitate in-time maintenance and avoid affecting 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, so it is easy to understand that p2 should be larger than p1, but if the detected result is that p2 is less than or equal to p1, the first interface K1 of the first air taking pipe 5 is blocked.
In the third state, the first valve A1 is closed, the second valve V1 is closed, waiting for the first preset time T1, and the differential pressure Δp=p3 detected by the DPF differential pressure sensor 7 is recorded.
In this state, the first gas intake pipe 5 and the first pipe 3 are disconnected, the second gas intake pipe 6 is connected, the second pipe 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 may be determined whether the first gas intake pipe 5 leaks according to step S32.
Specifically, step S32 is as follows: and judging whether the pipe to be detected leaks or not according to the difference value between p2 and p3 and the first limit value p max. And after the pipe to be detected leaks, a leakage fault prompt can be sent out so as to prompt a user in time, facilitate timely maintenance and avoid affecting the accuracy of a detection result.
In theory, 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 air intake pipe 5 leaks, after the first valve A1 is closed and the first preset time T1 is waited, the pressure in the first air intake pipe 5 may be reduced due to the leakage, so that the detected pressure differences p3 and p2 have a larger phase difference, and therefore, if the difference (absolute value) between p3 and p2 is greater than the first limit value p max, the first air intake pipe 5 is judged to leak.
In the fourth state, the first valve A1 is opened, the second valve V1 is closed, waiting for the second preset time T2, and the differential pressure Δp=p4 detected by the DPF differential pressure sensor 7 is recorded.
In this state, the first air taking pipe 5 is connected, the first pipeline 3 is disconnected, the second air taking pipe 6 is connected, the second pipeline 4 is disconnected, namely, the two air taking pipes are connected, 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, it may be determined whether the first gas intake pipe 5 is clogged according to step S34. Specifically, step S34 is: and judging whether the pipe to be detected is blocked or not according to the difference value between p3 and p4 and the second limit value p min.
Compared with the third state, the fourth state is that the first valve A1 of the first air intake pipe 5 is opened, after waiting for the second preset time T2, the original pressure in the first air intake pipe 5 is released, and the DPF differential pressure sensor 7 detects the differential pressure p4 between the upstream and downstream of the DPF, but if the variation of p4 and p3 is not great, if the difference (absolute value) between p4 and p3 is smaller than p min, it indicates that the original pressure in the first air intake pipe 5 is not released within the second preset time T2, that is, the first air intake pipe 5 is blocked.
That is, the failure of the gas taking tube includes an interface blockage failure, a leakage failure, and a blockage failure, and at least one of steps S31, S32, and S33 described above may be included in the above step S3 to determine whether the tube to be detected is malfunctioning.
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 judged not to be blocked according to the step S33;
s35: 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 air intake pipe 5 is blocked, 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 air source 1 can communicate with the first air intake pipe 5 through the first pipeline 3, so as to reversely purge the first air intake pipe 5, clean the first pipeline 3, and unblock the blockage 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 Δp=p4 in real time, and determines whether the first gas taking pipe 5 is blocked according to the step S33, if not, it indicates that the gas source 1 reversely purges and flushes the blocked portion of the first gas taking pipe 5 through the first pipeline 3, so as to complete cleaning of the first gas taking pipe 5, and then purging is not needed. However, if the second valve V1 is repeatedly opened and closed for the preset number of times N, it is determined in step S33 that the first air taking pipe 5 is still blocked, purging is stopped, and a failure prompt for blocking the first air taking pipe 5 is sent, so that a user is prompted in time, timely maintenance is facilitated, and influence on accuracy of a detection result is avoided.
In the above embodiment, before step S1, step S0 is further included: 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 intake pipe of the DPF differential pressure sensor 7.
Specifically, as shown in fig. 5, the cleaning method includes the steps of:
S100: and judging whether the engine is in an idle state and reaches a preset requirement.
Cleaning the intake pipe is performed when the engine is in an idle state, and the detection of the DPF differential pressure sensor 7 is reduced. The preset requirement can be set according to practical situations, for example, in this embodiment, the preset requirement is whether the running time of the current driving cycle exceeds a preset limit value T, so as to clean the air intake pipe regularly.
S200: and after the controller 2 simultaneously opens the valves to a preset time, closing the second valves.
The controller 2 is used for opening all the valves (including the first valves A1 and A2 and the second valves V1 and V2) simultaneously, the air source 1 can purge the first air taking pipe 5 through the first pipeline 3, the second air taking pipe 6 can purge through the second pipeline 4, after the purging is performed for a preset time t, all the second valves V1 and V2 are closed (at the moment, the first valves A1 and A2 can be closed or not), and the purging is stopped.
S300: step S200 is repeated until the preset number of times or the engine speed is 0.
And repeating the step S200, opening the valves simultaneously, and closing the second valves V1 and V2 after purging for a preset time t. That is, the purging operation is repeated for each gas taking pipe until the number of times of purging reaches the preset number of times M or the rotation speed of the engine is 0, that is, in the process of repeated purging, if the rotation speed of the engine is 0, purging is stopped at any time, and if the rotation speed of the engine is not 0 all the time, after the preset number of times of purging M, purging is stopped.
Between step S100 and step S200, step S110 is further included: the DPF differential pressure sensor 7 signal is latched. Because the DPF differential pressure sensor 7 detects the differential pressure between the upstream and the downstream of the DPF in real time, the signal of the DPF differential pressure sensor 7 is latched before purging, and the situations that a vehicle-mounted diagnosis system reports errors and triggers engine performance limitation and the like caused by great influence on the detection result of the differential pressure in the purging process can be avoided.
In this embodiment, the air source 1 is a whole air tank, and of course, the air source 1 can also be set independently, and when the air source 1 is formed by the whole air tank, the whole structure can be further simplified, the whole occupied space is reduced, the cost is reduced, and the economical efficiency is improved.
The foregoing is merely a preferred embodiment of the present application and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present application, which are intended to be comprehended within the scope of the present application.
Claims (4)
1. The detection method is based on a cleaning detection device and is used for detecting an air taking pipe of the DPF differential pressure sensor; the cleaning detection device is characterized by comprising an air source, a controller, a valve component, a first pipeline and a second pipeline;
One of the DPF differential pressure sensor and the upstream of the DPF and the DPF differential pressure sensor and the downstream of the DPF is connected with a first air taking pipe, the other one of the DPF differential pressure sensor and the DPF differential pressure sensor is connected with a second air taking pipe, a first interface is arranged at one end of the first air taking pipe, which faces the DPF differential pressure sensor, and a second interface is arranged at one end of the second air taking pipe, which faces the DPF differential pressure sensor;
the first pipeline is communicated between the air source and the first interface, and the second pipeline is communicated between the air source and the second interface;
The valve component comprises a first valve arranged on the first air taking pipe and the second air taking pipe respectively, and a second valve arranged on the first pipeline and the second pipeline respectively, and the controller is used for controlling the opening and closing of the valves;
the detection method comprises the following steps:
s0: starting an engine;
s1: taking a first gas taking pipe as a pipe to be detected, taking a second gas taking pipe as a matching pipe, and keeping a first valve arranged on the second gas taking pipe in an open state and keeping a second valve arranged on the second pipeline in a closed state;
s2: the method comprises the steps of 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 achieve different states, and recording the differential pressure delta P detected by a DPF differential pressure sensor in different states;
S3: judging whether the pipe to be detected has faults or not by analyzing the differential pressure delta P under different states;
S4: taking the second gas taking pipe as a pipe to be detected, taking the first gas taking pipe as a matched pipe, and keeping a first valve arranged on the first gas taking pipe in an open state and keeping a second valve arranged on the first pipeline in a closed state;
S5: detecting whether the pipe to be detected has a fault or not according to the steps S2-S3;
in step S2, the following four states are sequentially reached by adjusting the first valve of the pipe to be detected and the second valve of the pipeline connected with 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 the differential pressure DeltaP=p1 detected by a DPF differential pressure sensor is recorded;
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 differential pressure DeltaP=p2 detected by the DPF differential pressure sensor is recorded;
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 differential pressure deltaP=p3 detected by a DPF differential pressure sensor is recorded;
In a 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 differential pressure deltaP=p4 detected by a DPF differential pressure sensor is recorded;
In step S3, by analyzing the differential pressure Δp in different states, it is determined whether the pipe to be detected has a fault, and 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: judging whether the pipe to be detected leaks or not according to the difference value between p2 and p3 and the first limit value p max;
S33: and judging whether the pipe to be detected is blocked or not according to the difference value between p3 and p4 and the second limit value p min.
2. The detection method according to claim 1, wherein 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 leakage fault prompt is sent.
3. The method according to claim 1, wherein,
The steps between step S33 and step S4 further include the steps of:
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 judged not to be blocked according to the step S33;
s35: 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.
4. The method of claim 1, wherein the gas source is a whole gas tank.
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