CN112096498B - DPF ash loading capacity state detection method and system and vehicle - Google Patents
DPF ash loading capacity state detection method and system and vehicle Download PDFInfo
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- CN112096498B CN112096498B CN202011001954.6A CN202011001954A CN112096498B CN 112096498 B CN112096498 B CN 112096498B CN 202011001954 A CN202011001954 A CN 202011001954A CN 112096498 B CN112096498 B CN 112096498B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
- F01N2900/1611—Particle filter ash amount
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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
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Processes For Solid Components From Exhaust (AREA)
Abstract
The invention provides aFirst, a mileage interval S is calculated when the last DPF regeneration is performedi‑1(ii) a And then according to the mileage interval S of the last DPF regenerationi‑1Predicting the mileage interval S at the next DPF regenerationi(ii) a Finally passing the mileage interval SiIs separated from the preset mileage interval threshold SminThe comparison is carried out, and the DPF ash loading capacity state is judged, so that the DPF ash loading capacity state can be detected in the vehicle running process, a driver can be timely reminded, accidents are prevented, and the running safety is improved.
Description
Technical Field
The invention belongs to the technical field of vehicle fault detection, and particularly relates to a DPF ash loading capacity state detection method, a DPF ash loading capacity state detection system and a vehicle.
Background
In a vehicle equipped with an internal combustion engine such as a Diesel engine, a DPF (Diesel Particulate Filter) is generally provided in an exhaust pipe for guiding exhaust gas from the internal combustion engine to the atmosphere, and Particulate Matter (PM) such as carbon particles and dust contained in the exhaust gas is captured by the DPF. The DPF is a filter made of ceramic and has many honeycomb pores or quadrangular pores for discharging gas and trapping PM.
PM is composed of combustible particles (carbon particles, etc.), combustion residue impurities (such as particulate matter generated from engine oil and fuel additives), and a small portion of non-combustible dust.
When the pores of the DPF are entirely occupied by the PM, the DPF will no longer perform a filtering function for the particulates, and at this time, a DPF regeneration function will be turned on, and the DPF burns the particulates by exposing it to a very high temperature and blows out the burned residues by air pressure, thereby performing a function of removing impurities in the DPF, referred to as DPF regeneration, see fig. 2.
However, the DPF regeneration can only burn and remove carbon particles and other combustible impurities, but cannot remove the attached non-combustible dust, so that a part of non-combustible dust is left after each DPF regeneration, and the increase of the ash loading amount not only occupies the effective utilization volume of the DPF to reduce the filtering efficiency and make the gas difficult to discharge, but also has extremely high manufacturing cost, because the dust in the DPF is non-combustible, the effective utilization volume is inevitably smaller and smaller after one DPF regeneration, and finally the problem can not be solved by the DPF regeneration, and the DPF cleaning and maintenance points need to be specially cleaned, but at this time, the vehicle cannot normally run, and the safety problem is easy to occur, so a means for detecting the ash loading amount state in the vehicle running process is needed, so that a driver can be reminded in time, and accidents are prevented.
At present, although pressure sensors are additionally arranged on two sides of a DPF box body, and the blocking degree of the DPF can be read according to the front-back pressure difference of the DPF box body, the method can only detect the blocking degree caused by carbon deposition and dust deposition at the same time, and cannot carry out independent detection and judgment on the ash loading amount of the ash DPF.
Disclosure of Invention
Based on the above, the method and the system for detecting the DPF ash loading amount state and the vehicle are provided for solving the technical problem that the DPF ash loading amount state cannot be detected in the vehicle driving process at present.
In order to solve the technical problems, the invention adopts the following technical scheme:
in one aspect, a DPF ash loading status detection method is provided, including:
the mileage interval S at the time of the last DPF regeneration is calculated by the following formulai-1：
Si-1＝si-1-si-2，
Wherein s isi-1Is the total vehicle mileage, s, at the i-1 th DPF regenerationi-2Is the total vehicle mileage at the i-2 th DPF regeneration;
according to mileage interval S at last DPF regenerationi-1Predicting the mileage interval S at the next DPF regeneration by the following formulai：
Wherein, K1Is the carbon deposition coefficient, K, of the DPF2Is the soot deposition coefficient, K, of the DPF0＝K1+K2Is the particle factor of the DPF;
passing said mileage interval SiIs separated from the preset mileage interval threshold SminAnd (4) comparing, and judging the state of the DPF ash loading amount:
if Si≥SminThe current DPF ash loading may then support the vehicle for the next mileage interval SiNormally driving;
if Si＜SminThen the current DPF ash loading cannot support the vehicle for the next mileage interval SiAnd (5) normally running.
In another aspect, a DPF ash loading status detection system is provided, comprising a memory module including instructions loaded and executed by a processor, the instructions when executed cause the processor to perform a DPF ash loading status detection method as described above.
In still another aspect, a vehicle having a DPF ash loading status detection system as described above is provided.
The invention can detect the state of the DPF ash loading amount in the driving process of the vehicle, thereby reminding a driver in time, preventing accidents and improving the driving safety.
Drawings
The invention is described in detail below with reference to the following figures and detailed description:
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a schematic diagram of DPF regeneration principles;
FIG. 3 is a schematic diagram of DPF operating condition variation.
Detailed Description
As shown in fig. 1, an embodiment of the present disclosure provides a DPF ash loading state detection method, including:
s101, calculating mileage interval S during the last DPF regeneration by the following formulai-1：
Si-1＝si-1-si-2，
Wherein s isi-1Is the total vehicle mileage, s, at the i-1 th DPF regenerationi-2The total vehicle mileage at the i-2 th DPF regeneration.
In one embodiment of the invention, DPF regeneration may be judged by:
a. the DPF temperature is acquired in real time.
b. DPF regeneration occurs if the DPF temperature rises to a preset temperature and remains no lower than the preset temperature for at least a preset time.
The preset temperature and the preset time may be different for different vehicle models, for example, for a part of cloud domestic six vehicle models, when the DPF temperature rises to 500 degrees and is kept at not lower than 500 degrees for at least 5 minutes, DPF regeneration occurs.
The DPF can be reversely deduced to carry out the regeneration process through the temperature expression form, a DPF temperature sensor is usually arranged in the DPF and is generally used for helping to reduce the emission of harmful gases and improve the fuel efficiency, and the DPF temperature can be obtained in real time through the DPF temperature sensor.
In another embodiment of the present invention, DPF regeneration may also be judged by:
the vehicle ECU acquires the DPF regeneration state to determine whether or not DPF regeneration has occurred, and the ECU of a part of the vehicle can record the DPF regeneration state, and thus can determine this.
Wherein, the total vehicle mileage s during the i-2 th DPF regeneration can be obtained by the vehicle mileage counting modulei-2And total vehicle mileage s at i-1 th DPF regenerationi-1。
S102, mileage interval S based on last DPF regenerationi-1Predicting the mileage interval S at the next DPF regeneration by the following formulai：
Wherein, K1Is the carbon deposition coefficient, K, of the DPF2Is the soot deposition coefficient, K, of the DPF0＝K1+K2The product particle coefficient of the DPF.
S103, passing mileage interval SiIs separated from the preset mileage interval threshold SminAnd (4) comparing, and judging the state of the DPF ash loading amount:
if Si≥SminThe current DPF ash loading may then support the vehicle for the next mileage interval SiAnd (5) normally running.
If Si＜SminThen the current DPF ash loading cannot support the vehicle for the next mileage interval SiAnd (5) normally running.
When the DPF is just changed, carbon-free ash is not arranged in the DPF, the DPF is blocked after a period of mileage interval, the DPF regeneration is started at the moment, combustible particles are exhausted after being burnt, dust particles which cannot be burnt are still remained in the DPF at the moment, and the dust particles occupy a certain volume, so that the next period of mileage interval can actually only utilize the volume of the DPF except the partial volume to filter, the amount of the particles which can be carried by the DPF can be reduced, and the next period of mileage is shortened.
The present invention can pass the mileage interval S when regenerating the previous DPFi-1Measurements are made to achieve the mileage interval S for the next DPF regenerationiAnd (4) predicting.
When the predicted mileage interval SiLess than a certain value (lowest allowable mileage interval, i.e. mileage interval threshold S)min) When the automobile is in use, the available effective filtering space in the automobile is smaller than a certain value, so that the ash carrying amount is indicated to reach the degree of influencing the normal operation of the DPF, the DPF cannot regenerate and remove incombustible ash particles in the DPF, and the effective filtering space is not enough to support the normal running of the automobile at the next mileage interval, so that the automobile can give a warning to a driver in time and remind the driver to remove the DPF from a special after-sale place.
The minimum allowable mileage interval can represent the ash loading amount of the DPF from the side, because the larger the ash loading amount is, the smaller the remaining available volume is, and the smaller the allowable mileage interval is, and can be set manually according to experience or according to the need of early warning.
As shown in FIG. 3, the following mileage interval S for the next DPF regenerationiThe prediction principle of (2) will be explained in detail.
Suppose V1、V2、V3、V4Are mileage intervals S, respectively1、S2、S3、S4Initial effective available volume of DPF, K1Is the carbon deposition coefficient, K2Is the coefficient of dust formation, K0＝K1+K2The product particle coefficient.
Taking the start of the temperature rise of the DPF to the preset temperature as a regeneration node of the DPF, and calculating the mileage interval S between the front node and the rear node1、S2、S3、S4It is to be noted that V1、V2、V3、V4The intermediate quantities are calculated and not measured.
In the first mileage interval, the vehicle travels over S1Effective utilization volume of DPF is defined by V1Becomes 0, V1＝K0·S1。
At this time, DPF regeneration is performed, and soot is burned and discharged while a part of incombustible ash remains, and the remaining effective utilization volume is V at this time2The deposition volume can be expressed by a deposition coefficient: v1-V2＝K2S1。
In the second mileage interval, the vehicle runs over S2Effective utilization volume of DPF is defined by V2Becomes 0, V2＝K0·S2。
Simultaneous system of equations: v1＝K0·S1①
V2＝K0·S2②
V1-V2＝K2S1③
Solved to (K)0-K2)S1＝K0·S2I.e. K1·S1＝K0·S2. Meaning in the mileage interval S1The volume occupied by the medium carbon deposit is just the second-stage mileage interval after regenerationS2Effective volume to be used, also the second range of mileage intervals S2The volume sum of the carbon deposit amount and the ash deposit amount.
From this it can be derived
S1Further, the mileage interval of the next regeneration point at any one regeneration point can be obtained
It should be noted that, when different vehicles are driven, the amount of soot in the DPF is different from the amount of soot in the DPF which increases with the mileage, so K1And K2Are all measured in advance.
Based on the same inventive concept, the present specification also provides a DPF ash loading status detection system, comprising a storage module including instructions (program code) loaded and executed by a processor, the instructions, when executed, causing the processor to perform the steps according to various exemplary embodiments of the present invention described in the above-mentioned DPF ash loading status detection method section of the present specification.
The memory module may include a readable medium in the form of a volatile memory unit, such as a random access memory unit (RAM) and/or a cache memory unit, and may further include a read only memory unit (ROM).
Program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device and partly on a remote computing device, or entirely on the remote computing device or server. In the case of a remote computing device, the remote computing device may be connected to the user computing device through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computing device (e.g., through the internet using an internet service provider).
Based on the same inventive concept, the embodiment of the present specification further provides a vehicle, and the vehicle has the DPF ash loading capacity state detection system, which is not described herein again in detail.
In summary, the present invention provides a DPF ash loading amount status detection method, a DPF ash loading amount status detection system, and a vehicle, which can detect a DPF ash loading amount status during a vehicle driving process, so as to prompt a driver in time, prevent an accident, and improve driving safety.
However, those skilled in the art should realize that the above embodiments are illustrative only and not limiting to the present invention, and that changes and modifications to the above described embodiments are intended to fall within the scope of the appended claims, provided they fall within the true spirit of the present invention.
Claims (7)
1. A DPF ash loading capacity state detection method is characterized by comprising the following steps:
the mileage interval S at the time of the last DPF regeneration is calculated by the following formulai-1：
Si-1＝si-1-si-2，
Wherein s isi-1Is the total vehicle mileage, s, at the i-1 th DPF regenerationi-2Is the total vehicle mileage at the i-2 th DPF regeneration;
according to mileage interval S at last DPF regenerationi-1Predicting the mileage interval S at the next DPF regeneration by the following formulai：
Wherein, K1Is the carbon deposition coefficient, K, of the DPF2Is the soot deposition coefficient, K, of the DPF0＝K1+K2Is the particle factor of the DPF;
passing said mileage interval SiIs separated from the preset mileage interval threshold SminAnd (4) comparing, and judging the state of the DPF ash loading amount:
if Si≥SminThe current DPF ash loading may then support the vehicle for the next mileage interval SiNormally driving;
if Si＜SminThen the current DPF ash loading cannot support the vehicle for the next mileage interval SiAnd (5) normally running.
2. The DPF ash loading state detection method according to claim 1, wherein the DPF regeneration is determined by:
obtaining DPF temperature in real time;
DPF regeneration occurs if the DPF temperature rises to a preset temperature and remains no lower than the preset temperature for at least a preset time.
3. The DPF ash loading state detection method of claim 2, wherein the DPF temperature is obtained in real time by a DPF temperature sensor.
4. The DPF ash loading state detection method according to claim 1, wherein the DPF regeneration is determined by:
the DPF regeneration state is acquired by the vehicle ECU to determine whether DPF regeneration has occurred.
5. The DPF ash loading status detection method as claimed in claim 3 or 4, wherein the vehicle mileage s at the i-2 th DPF regeneration is obtained by the vehicle mileage counting modulei-2And total vehicle mileage s at i-1 th DPF regenerationi-1。
6. A DPF ash state detection system comprising a memory module containing instructions loaded and executed by a processor, said instructions when executed causing said processor to perform a DPF ash state detection method according to any of claims 1-5.
7. A vehicle having a DPF ash loading status detection system according to claim 6.
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