CN111026085A - DPF damage fault diagnosis system and method and heavy-duty diesel vehicle - Google Patents
DPF damage fault diagnosis system and method and heavy-duty diesel vehicle Download PDFInfo
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- CN111026085A CN111026085A CN201911320689.5A CN201911320689A CN111026085A CN 111026085 A CN111026085 A CN 111026085A CN 201911320689 A CN201911320689 A CN 201911320689A CN 111026085 A CN111026085 A CN 111026085A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0259—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterized by the response to fault detection
- G05B23/0262—Confirmation of fault detection, e.g. extra checks to confirm that a failure has indeed occurred
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24065—Real time diagnostics
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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Abstract
The invention provides a DPF damage fault diagnosis system, a DPF damage fault diagnosis method and a heavy-duty diesel vehicle, wherein the DPF damage fault diagnosis system is provided with a PM sensor and an SCR downstream temperature sensor; a switch module for PM sensor fault reset calculation; the post-processing controller is used for processing the information of the PM sensor and judging the damage fault information of the DPF; a fault indicator lamp for prompting the occurrence of DPF damage fault; the fault information display module is used for prompting the damage fault of the DPF, and the remote server is used for displaying the fault information; the remote server is in communication connection with the post-processing controller, and the remote server acquires, stores and displays DPF fault information through the post-processing controller. The method can accurately and quickly detect the DPF damage fault and fault degree, and realize quick fault positioning; the cross-measurement-cycle current signal processing is carried out aiming at the insensitive characteristic of the PM sensor under the working condition of small exhaust flow and the low damage degree of the DPF, the failure report missing condition is reduced, and the method is suitable for large-scale application.
Description
Technical Field
The invention relates to the technical field of vehicle fault detection, in particular to a DPF damage fault diagnosis system and method and a heavy-duty diesel vehicle.
Background
With the implementation of the sixth phase of the emission regulation of heavy-duty diesel vehicles, the number of particles PM and PN in the exhaust gas of the vehicles becomes an important standard for measuring the quality of the vehicles. To meet regulatory emission requirements, heavy-duty diesel vehicles employ particulate traps (DPFs) to reduce particulate matter in the exhaust. The sixth stage of emissions legislation for heavy duty diesel vehicles clearly requires that the system be able to detect DPF carrier damage failure. When the DPF carrier damage fault occurs, the particulate matter emission can be directly influenced; once failures are not effectively detected, environmental pollution is caused, and the economic and reputation of enterprises are damaged.
The existing DPF carrier damage fault diagnosis technology generally adopts a PM sensor to reflect a current signal of particulate matters at the downstream of an exhaust pipe or a differential pressure signal of a DPF differential pressure sensor to judge. When the DPF carrier damage degrees are the same under different working conditions, the accumulation effects of current signals fed back by the PM sensor are greatly different, so that the condition of failure of missing report is easy to occur; when the damage degree of the DPF carrier is slight under the same working condition, because the current signal fed back by the PM sensor is slow to accumulate, the condition that the current signal is cleared due to entering the initialization stage of the next PM measuring period when the current signal does not reach the fault threshold value in one PM measuring period easily occurs, and the fault is easy to occur and can not be reported. When the pressure difference of the DPF pressure difference sensor is utilized to carry out DPF damage fault diagnosis, the fault condition of false alarm is easy to occur.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a DPF damage fault diagnosis system, which can realize quick and accurate fault.
The method comprises the following steps: a PM sensor for detecting an amount of particulate matter downstream of the exhaust pipe; an SCR downstream temperature sensor for PM sensor dew point detection control; a switch module for PM sensor fault reset calculation; the post-processing controller is used for processing the information of the PM sensor and judging the damage fault information of the DPF; a fault indicator lamp for prompting the occurrence of DPF damage fault; the fault information display module is used for prompting the damage fault of the DPF, and the remote server is used for displaying the fault information;
the PM sensor is arranged on the SCR downstream exhaust pipe and behind the SCR downstream temperature sensor, the SCR downstream temperature sensor is arranged on the SCR downstream exhaust pipe, the fault indicator lamp is arranged in a cab, and the fault information display module is arranged and displayed in a cab instrument;
the remote server is in communication connection with the post-processing controller, and the remote server acquires DPF fault, stores and displays DPF fault information through the post-processing controller.
It is further noted that the aftertreatment controller includes: the device comprises a PM sensor control calculation module, a PM sensor state calculation module, a PM sensor current reading module, a PM sensor current processing module, a DPF damage fault detection condition calculation module, a DPF damage fault occurrence calculation module and a DPF damage fault confirmation calculation and storage module;
the PM sensor control calculation module is used for calculating and controlling a PM sensor working process request;
and the PM sensor state calculating module is used for calculating the actual working process stage of the PM sensor according to the PM sensor feedback information. Each working stage is divided into an initialization stage, a thermal balance stage and a measurement stage;
the PM sensor current reading module is used for reading a PM sensor current signal through the CAN communication module;
the PM sensor current processing module is used for judging cross-test cyclic processing of the PM sensor current according to the current exhaust flow and the vehicle working condition;
the DPF damage fault detection condition calculation module is used for judging whether the current vehicle working condition allows DPF damage fault detection;
the DPF damage fault occurrence calculation module is used for comparing the current PM sensor current with the PM sensor threshold value under the fault condition on the premise that the fault detection condition is met to judge whether the DPF damage fault occurs or not;
and the DPF damage fault confirmation calculation and storage module is used for confirming, calculating and storing according to the original signal of DPF damage fault. When the fault confirmation occurs, storing the fault information into the EEPROM; when the fault confirmation no longer occurs, the fault information is cleared from the EEPROM after a certain number of driving cycles.
It should be further noted that the remote server includes: the device comprises a current information acquisition module, a PM sensor current curve setting module, a measurement period decomposition module, a PM sensor current curve configuration module and a display generation module; (ii) a
The current information acquisition module is used for sending a current information acquisition instruction to the post-processing controller and sending a time point incidentally;
and the post-processing controller receives the current information acquisition instruction, sends out a time point, and transmits the current information and the acquisition time point in the measurement time period to the remote server.
The PM sensor current curve setting module is used for setting a measurement period and setting the display duration of a current curve in a preset measurement period time period;
the measurement period decomposition module is used for decomposing the measurement period into an initialization stage, a thermal balance stage and a measurement stage during display;
the PM sensor current curve configuration module is used for configuring a PM sensor current curve in the measurement stage of the measurement period and setting a slight fault damage current threshold and a serious fault damage current threshold;
configuring an X axis as a time axis and a Y axis as a current value axis to form a PM sensor current coordinate system, and configuring a dividing line between measurement periods in the PM sensor current coordinate system;
and the display generation module is used for displaying a PM sensor current curve in a PM sensor current coordinate system according to the acquired current information.
It should be further noted that the display generation module of the remote server includes: a current information judging module and a current information sending time interval judging module;
the current information judging module is used for judging whether the acquisition time of the current information is the next time point of the acquisition time received last time or not according to the received current information and the acquisition time point;
if so, configuring the current information received at present into a PM sensor current coordinate system, and forming a PM sensor current curve with the current information received at the last time;
if not, the current information received at present is non-conforming information, and the PM sensor current curve is not operated.
The current information sending time interval judging module is used for judging whether the time interval between the current information receiving time point and the sending time point of the current information acquiring module is within the preset acquiring threshold value range or not according to the judging result of the current information judging module when the judging result of the current information judging module is positive,
when the current information is within the range of the acquired threshold value, configuring the received current information into a PM sensor current curve; if not, the current information received currently is set as non-configuration information, and the PM sensor current curve is not updated.
The invention also provides a DPF damage fault diagnosis method, which comprises the following steps: the method comprises the following steps:
starting the engine, and resetting the PM sensor through the switch module;
the post-processing controller performs control calculation at the working stage of the PM sensor and acquires the running state of the PM sensor according to the detection condition of the dew point of the PM sensor and the starting state of the engine;
reading a current signal in the PM sensor reflecting the amount of particulate matter in the exhaust downstream of the SCR;
when the automobile is lower than a preset small exhaust flow working condition threshold or when the automobile is higher than a preset large exhaust flow working condition threshold and the maximum current signal is larger than a non-fault current threshold but smaller than a fault current threshold, the post-processing controller carries out cross-measurement cyclic processing on the current signal;
when the fault diagnosis condition is met, judging whether the current signal of the PM sensor is in a fault threshold range;
and comparing the PM sensor current signal with a DPF damage fault current threshold, and if the current signal is greater than the DPF damage fault current threshold, reporting a DPF damage original fault.
It is further noted that the PM working phase is divided into an initialization phase, a thermal equilibrium phase and a measurement phase;
when the PM sensor initialization phase is over and the thermal equilibrium is over, the measurement of the PM sensor is started.
The present invention also provides a heavy-duty diesel vehicle, characterized by comprising: DPF damage fault diagnosis system.
According to the technical scheme, the invention has the following advantages:
the DPF damage fault diagnosis system provided by the invention has a simple structure, can accurately and quickly detect DPF damage faults and fault degrees, and can realize quick fault positioning; the cross-measurement-cycle current signal processing is carried out aiming at the insensitive characteristic of the PM sensor under the working condition of small exhaust flow and the low damage degree of the DPF, the failure report missing condition is reduced, and the method is suitable for large-scale application.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly introduced, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a DPF damage fault diagnostic system;
FIG. 2 is a schematic of a PM sensor raw current;
FIG. 3 is a schematic diagram of the current after PM sensor signal processing.
Description of reference numerals:
1-PM sensor, 2-SCR downstream temperature sensor, 3-T15 switch, 4-post processing ACU controller, 5-fault indicator light, 6-fault information display, 7-fault information storage server, i 1-large exhaust flow original current when DPF is seriously damaged in the first measurement period, i 2-small exhaust flow original current when DPF is seriously damaged in the first measurement period, i 3-large exhaust flow original current when DPF is slightly damaged in the first measurement period, i 4-small exhaust flow original current when DPF is normal in the first measurement period, i 5-large exhaust flow original current when DPF is seriously damaged in the second measurement period, i 6-small exhaust flow original current when DPF is seriously damaged in the second measurement period, i 7-large exhaust flow original current when DPF is slightly damaged in the second measurement period, i 8-the small exhaust flow raw current when the DPF is normal in the second measurement period, i 9-the small exhaust flow signal processing current when the DPF is severely damaged in the second measurement period, and i 10-the large exhaust flow signal processing current when the DPF is slightly damaged in the second measurement period.
Detailed Description
Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be embodied in electronic hardware, computer software, or combinations of both, and that the components and steps of the examples have been described in a functional general in the foregoing description for the purpose of illustrating clearly the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The block diagrams shown in the figures are functional entities only and do not necessarily correspond to physically separate entities. I.e. these functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor means and/or microcontroller means. The DPF damage failure diagnosis system uses suffixes such as "module", "part", or "unit" for representing elements only for facilitating the description of the embodiment of the present invention, which itself has no specific meaning. Thus, "module" and "component" may be used in a mixture.
The present invention provides a DPF damage failure diagnosis system, as shown in fig. 1 to 3, comprising: a PM sensor 1 for detecting the amount of particulate matter downstream of the exhaust pipe; an SCR downstream temperature sensor 2 for dew point detection control of the PM sensor 1; a switching module 3 for fault reset calculation of the PM sensor 1; a post-processing controller 4 for PM sensor 1 control calculation and DPF damage failure calculation; a fault indicator lamp 5 for prompting the occurrence of DPF damage fault; a fault information display module 6 for prompting DPF damage fault and a remote server 7;
the PM sensor 1 is installed on an SCR downstream exhaust pipe and behind an SCR downstream temperature sensor 2, the SCR downstream temperature sensor 2 is installed on the SCR downstream exhaust pipe, a fault indicator lamp 5 is installed in a cab, and a fault information display module 6 is installed and displayed in a cab instrument;
the remote server 7 is connected to the aftertreatment controller 4 in a communication manner, and the remote server 7 acquires DPF failure information and processing information of the aftertreatment controller 4 through the aftertreatment controller 4.
The remote server 7 can realize real-time monitoring of the system and storage of data information.
In the present invention, the aftertreatment controller 4 includes: the device comprises a PM sensor control calculation module, a PM sensor state calculation module, a PM sensor current reading module, a PM sensor current processing module, a DPF damage fault detection condition calculation module, a DPF damage fault occurrence calculation module and a DPF damage fault confirmation calculation and storage module;
the PM sensor control calculation module is used for calculating and controlling a PM sensor working process request; and the PM sensor state calculating module is used for calculating the actual working process stage of the PM sensor according to the PM sensor feedback information. Each working stage is divided into an initialization stage, a thermal balance stage and a measurement stage; the PM sensor current reading module is used for reading a PM sensor current signal through the CAN communication module; the PM sensor current processing module is used for judging cross-test cyclic processing of the PM sensor current according to the current exhaust flow and the vehicle working condition; the DPF damage fault detection condition calculation module is used for judging whether the current vehicle working condition allows DPF damage fault detection; the DPF damage fault occurrence calculation module is used for comparing the current PM sensor current with the PM sensor threshold value under the fault condition on the premise that the fault detection condition is met to judge whether the DPF damage fault occurs or not; and the DPF damage fault confirmation calculation and storage module is used for performing debounce confirmation calculation and storage according to the original signal of the DPF damage fault. When the fault confirmation occurs, storing the fault information into the EEPROM; when the fault confirmation no longer occurs, the fault information is cleared from the EEPROM after a certain number of driving cycles.
In the present invention, the remote server 7 includes: the device comprises a current information acquisition module, a PM sensor current curve setting module, a measurement period decomposition module, a PM sensor current curve configuration module and a display generation module; (ii) a
The current information acquisition module is used for sending a current information acquisition instruction to the post-processing controller 4 and sending a time point incidentally; the post-processing controller 4 receives the current information acquisition instruction and sends out the time point, and transmits the current information and the acquisition time point in the measurement time period to the remote server 7. The PM sensor current curve setting module is used for setting a measurement period and setting the display duration of a current curve in a preset measurement period time period;
the measurement period decomposition module is used for decomposing the measurement period into an initialization stage, a thermal balance stage and a measurement stage during display;
the PM sensor current curve configuration module is used for configuring a PM sensor current curve in the measurement stage of the measurement period and setting a slight fault damage current threshold and a serious fault damage current threshold; configuring an X axis as a time axis and a Y axis as a current value axis to form a PM sensor current coordinate system, and configuring a dividing line between measurement periods in the PM sensor current coordinate system;
and the display generation module is used for displaying a PM sensor current curve in a PM sensor current coordinate system according to the acquired current information.
The display generation module in the remote server 7 includes: a current information judging module and a current information sending time interval judging module;
the current information judging module is used for judging whether the acquisition time of the current information is the next time point of the acquisition time received last time or not according to the received current information and the acquisition time point; if so, configuring the current information received at present into a PM sensor current coordinate system, and forming a PM sensor current curve with the current information received at the last time; if not, the current information received at present is non-conforming information, and the PM sensor current curve is not operated.
The current information sending time interval judging module is used for judging whether the time interval between the current receiving time point and the sending time point of the current information acquiring module is within a preset acquiring threshold range or not according to the judging result of the current information judging module when the judging result of the current information judging module is positive. When the current information is within the range of the acquired threshold value, configuring the received current information into a PM sensor current curve; if not, the current information received currently is set as non-configuration information, and the PM sensor current curve is not updated.
The invention also provides a DPF damage fault diagnosis method, which comprises the following steps: the method comprises the following steps:
starting the engine, and carrying out fault resetting on the PM sensor 1 through the switch module 3;
the post-processing controller 4 performs control calculation at the working stage of the PM sensor 1 and acquires the running state of the PM sensor 1 according to the dew point detection condition of the PM sensor 1 and the starting state of the engine;
reading a current signal in the PM sensor 1 reflecting the amount of particulate matter in the exhaust gas downstream of the SCR;
when the automobile is lower than a preset small exhaust flow working condition threshold or when the automobile is higher than a preset large exhaust flow working condition threshold and the maximum current signal is greater than a non-fault current threshold but less than a fault current threshold, the post-processing controller 4 carries out cross-measurement cyclic processing on the current signal;
when the fault diagnosis condition is met, judging whether the current signal of the PM sensor is in a fault threshold range;
and comparing the PM sensor current signal with a DPF damage fault current threshold, and if the current signal is greater than the DPF damage fault current threshold, reporting a DPF damage original fault.
In the embodiment provided by the invention, the ACU performs control calculation on the data of the PM sensor and judges the damage fault of the DPF.
The switch module is used for carrying out power-on reset fault control on the PM sensor, carrying out work starting control on the PM sensor according to the dew point detection state of the PM sensor and the running state of the engine, and carrying out measurement starting control on the PM sensor after the regeneration initialization stage of the PM sensor is finished and the thermal balance is finished; acquiring current state information of a PM sensor, wherein one PM measuring period is divided into three stages of regeneration initialization, thermal balance and measurement; then entering a PM sensor current reading stage, and reading the effective PM sensor current in a PM sensor measuring stage; then entering a PM sensor current processing stage, and processing a current signal of a cross-measurement cycle at a PM sensor current processing module when the PM sensor current is larger than a normal state threshold value under a small exhaust flow working condition and a large exhaust flow working condition; and entering a fault judgment stage, and comparing and judging the data information by the post-processing controller. On the premise that DPF damage fault detection conditions are met, comparing the processed actual PM sensor current with a DPF damage fault current threshold, and if the actual current is larger than the current threshold when the DPF is damaged and faulted, reporting that the DPF is damaged and has an original fault; and finally, fault confirmation and storage are carried out, fault confirmation processing is carried out on the original fault of DPF damage, and fault information is stored when fault confirmation occurs.
In this embodiment, the PM sensor dew point detection state can be determined by the SCR downstream temperature being greater than the PM sensor dew point temperature threshold.
In this embodiment, the end of the PM sensor regeneration initialization phase may be determined by the temperature fed back by the PM sensor being less than the maximum temperature threshold for the PM sensor regeneration temperature.
In this embodiment, the end of the PM sensor thermal balance may be determined by decreasing the temperature fed back by the PM sensor from the PM sensor regeneration maximum temperature to the balance temperature threshold.
In this embodiment, the DPF damage failure detection condition may be that the DPF carrier is not in the process of regeneration and the PM sensor is not failed.
As shown in fig. 2 and 3, the PM sensor current processing stage is schematically operated. As shown in the raw current diagram of the PM sensor in fig. 2, i2 and i6 are the raw currents of the small exhaust flow when the DPF is seriously damaged in the first measurement period and the second measurement period, respectively, and i3 and i7 are the raw currents of the large exhaust flow when the DPF is slightly damaged in the first measurement period and the second measurement period, respectively, and cannot reach the corresponding fault threshold, resulting in a fault failure. As shown in the current schematic diagram after the signal processing of the PM sensor in fig. 3, i9 is the small exhaust flow signal processing current when the DPF is seriously damaged in the second measurement period, i10 is the large exhaust flow signal processing current when the DPF is slightly damaged in the second measurement period, and both the processed currents i9 and i10 can reach the corresponding fault threshold, thereby ensuring that the fault is not missed.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A DPF damage fault diagnostic system, comprising: a PM sensor (1) for detecting an amount of particulate matter downstream of the exhaust pipe; an SCR downstream temperature sensor (2) for PM sensor (1) dew point detection control; a switching module (3) for fault reset calculation of the PM sensor (1); a post-processing controller (4) used for processing information of the PM sensor (1) and judging DPF damage fault information; a fault indicator lamp (5) for prompting the occurrence of DPF damage fault; the fault information display module (6) is used for prompting DPF damage faults, and the remote server (7) is used for prompting DPF damage faults;
the PM sensor (1) is installed on an SCR downstream exhaust pipe and behind an SCR downstream temperature sensor (2), the SCR downstream temperature sensor (2) is installed on the SCR downstream exhaust pipe, a fault indicator lamp (5) is installed in a cab, and a fault information display module (6) is installed and displayed in a cab instrument;
the remote server (7) is in communication connection with the post-processing controller (4), and the remote server (7) acquires, stores and displays DPF fault information through the post-processing controller (4).
2. The DPF damage failure diagnostic system of claim 1,
the aftertreatment controller (4) comprises: the device comprises a PM sensor control calculation module, a PM sensor state calculation module, a PM sensor current reading module, a PM sensor current processing module, a DPF damage fault detection condition calculation module, a DPF damage fault occurrence calculation module and a DPF damage fault confirmation calculation and storage module;
the PM sensor control calculation module is used for calculating and controlling a PM sensor working process request;
and the PM sensor state calculating module is used for calculating the actual working process stage of the PM sensor according to the PM sensor feedback information. Each working stage is divided into an initialization stage, a thermal balance stage and a measurement stage;
the PM sensor current reading module is used for reading a PM sensor current signal through the CAN communication module;
the PM sensor current processing module is used for judging cross-test cyclic processing of the PM sensor current according to the current exhaust flow and the vehicle working condition;
the DPF damage fault detection condition calculation module is used for judging whether the current vehicle working condition allows DPF damage fault detection;
the DPF damage fault occurrence calculation module is used for comparing the current PM sensor current with the PM sensor threshold value under the fault condition on the premise that the fault detection condition is met to judge whether the DPF damage fault occurs or not;
and the DPF damage fault confirmation calculation and storage module is used for confirming, calculating and storing according to the original signal of DPF damage fault. When the fault confirmation occurs, storing the fault information into the EEPROM; when the fault confirmation no longer occurs, the fault information is cleared from the EEPROM after a certain number of driving cycles.
3. The DPF damage failure diagnostic system of claim 2,
the remote server (7) comprises: the device comprises a current information acquisition module, a PM sensor current curve setting module, a measurement period decomposition module, a PM sensor current curve configuration module and a display generation module;
the current information acquisition module is used for sending a current information acquisition instruction to the post-processing controller (4) and sending a time point incidentally;
the post-processing controller (4) receives the current information acquisition instruction and sends out a time point, and transmits the current information and the acquisition time point in the measurement time period to the remote server (7).
The PM sensor current curve setting module is used for setting a measurement period and setting the display duration of a current curve in a preset measurement period time period;
the measurement period decomposition module is used for decomposing the measurement period into an initialization stage, a thermal balance stage and a measurement stage during display;
the PM sensor current curve configuration module is used for configuring a PM sensor current curve in the measurement stage of the measurement period and setting a slight fault damage current threshold and a serious fault damage current threshold;
configuring an X axis as a time axis and a Y axis as a current value axis to form a PM sensor current coordinate system, and configuring a dividing line between measurement periods in the PM sensor current coordinate system;
and the display generation module is used for displaying a PM sensor current curve in a PM sensor current coordinate system according to the acquired current information.
4. The DPF damage failure diagnostic system of claim 3,
the display generation module includes: a current information judging module and a current information sending time interval judging module;
the current information judging module is used for judging whether the acquisition time of the current information is the next time point of the acquisition time received last time or not according to the received current information and the acquisition time point;
if so, configuring the current information received at present into a PM sensor current coordinate system, and forming a PM sensor current curve with the current information received at the last time;
if not, the current information received at present is non-conforming information, and the PM sensor current curve is not operated.
The current information sending time interval judging module is used for judging whether the time interval between the current information receiving time point and the sending time point of the current information acquiring module is within the preset acquiring threshold value range or not according to the judging result of the current information judging module when the judging result of the current information judging module is positive,
when the current information is within the range of the acquired threshold value, configuring the received current information into a PM sensor current curve; if not, the current information received currently is set as non-configuration information, and the PM sensor current curve is not updated.
5. A DPF damage failure diagnosis method comprising: the method comprises the following steps:
starting an engine, and resetting the PM sensor (1) through a switch module (3) in a fault manner;
the post-processing controller (4) performs control calculation on the working stage of the PM sensor (1) and acquires the running state of the PM sensor (1) according to the dew point detection condition of the PM sensor (1) and the starting state of the engine;
reading a current signal in a PM sensor (1) reflecting the amount of particulate matter in exhaust gas downstream of the SCR;
when the automobile is lower than a preset small exhaust flow working condition threshold or when the automobile is higher than a preset large exhaust flow working condition threshold and the maximum current signal is larger than a non-fault current threshold but smaller than a fault current threshold, the post-processing controller (4) carries out cross-measurement cyclic processing on the current signal;
when the fault diagnosis condition is met, judging whether the current signal of the PM sensor is in a fault threshold range;
and comparing the PM sensor current signal with a DPF damage fault current threshold, and if the current signal is greater than the DPF damage fault current threshold, reporting a DPF damage original fault.
6. The DPF damage failure diagnosis method as set forth in claim 5,
the PM working phase is divided into an initialization phase, a thermal balance phase and a measurement phase;
when the PM sensor initialization phase is over and the thermal equilibrium is over, the measurement of the PM sensor is started.
7. A heavy-duty diesel vehicle, comprising: the DPF damage failure diagnosis system of any one of claims 1 to 4.
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| Publication number | Priority date | Publication date | Assignee | Title |
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