CN114151217B - Vehicle DPF protection method and protection system - Google Patents
Vehicle DPF protection method and protection system Download PDFInfo
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- CN114151217B CN114151217B CN202111434006.6A CN202111434006A CN114151217B CN 114151217 B CN114151217 B CN 114151217B CN 202111434006 A CN202111434006 A CN 202111434006A CN 114151217 B CN114151217 B CN 114151217B
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- 238000000034 method Methods 0.000 title claims abstract description 39
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 432
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 158
- 239000001301 oxygen Substances 0.000 claims abstract description 158
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 158
- 239000007789 gas Substances 0.000 claims abstract description 88
- 239000000446 fuel Substances 0.000 claims abstract description 61
- 238000002347 injection Methods 0.000 claims abstract description 45
- 239000007924 injection Substances 0.000 claims abstract description 45
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 38
- 229910052799 carbon Inorganic materials 0.000 claims description 38
- 238000009825 accumulation Methods 0.000 claims description 28
- 238000012937 correction Methods 0.000 claims description 15
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 abstract description 20
- 238000012544 monitoring process Methods 0.000 abstract description 7
- 230000008929 regeneration Effects 0.000 description 12
- 238000011069 regeneration method Methods 0.000 description 12
- 239000002245 particle Substances 0.000 description 8
- 238000002679 ablation Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1454—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/007—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring oxygen or air concentration downstream of the exhaust apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/146—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an NOx content or concentration
- F02D41/1461—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an NOx content or concentration of the exhaust gases emitted by the engine
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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
Abstract
The invention relates to a vehicle DPF protection method and a protection system, wherein the vehicle DPF protection method comprises the following steps: judging whether the oxygen concentration value in the exhaust gas of the vehicle is in an excessively low state or not; judging whether the concentration value of nitrogen oxides in the exhaust gas of the vehicle is in an excessively low state or not; if the oxygen concentration value and the nitrogen oxide concentration value in the vehicle exhaust gas are in an excessively low state, adjusting the fuel injection quantity of an engine of the vehicle until the oxygen concentration value and the nitrogen oxide concentration value in the vehicle exhaust gas are both raised to a preset reasonable interval; the method comprises the steps of accurately monitoring the gas concentration in the using process of a vehicle by judging whether the oxygen concentration value in the exhaust gas of the vehicle is in an excessively low state or not and judging whether the nitrogen oxide concentration value in the exhaust gas of the vehicle is in an excessively low state or not; the method for optimizing combustion by adjusting the fuel injection quantity of the engine solves the problems from the source, improves the use reliability of the DPF and realizes the aims of low fuel consumption and high reliability.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a vehicle DPF protection method and a vehicle DPF protection system.
Background
In recent years, as the national VI emission regulations of diesel engine are stricter in terms of emission limit of particulate matters in diesel engine emissions, it is required that a DPF (Diesel Particulate Filter ) must be installed for diesel aftertreatment, and the DPF can efficiently trap carbon particles generated by diesel combustion, so that the rate of accumulating carbon particles in the DPF is closely related to the combustion conditions in the engine cylinder. When the air-fuel ratio of the mixture gas entering the cylinder is low, combustion is deteriorated, generated carbon particles are increased, and at the same time, the rate of accumulated carbon particles in the DPF is increased, which means that the DPF is more prone to generating excessive burning or blockage of regeneration temperature, for example, when combustion is deteriorated due to abnormal air intake or oil injection of an engine, the rate of accumulated carbon in the DPF is increased, the actual regeneration period of the DPF is shortened, and the reliability of the DPF is reduced, for example, the problems of DPF regeneration burning and DPF blockage are caused. In order to avoid the occurrence of the above-described problem, it is necessary to recognize this condition in advance and take measures as early as possible. However, in the prior art, the monitoring accuracy is low; and after recognizing that the carbon accumulation rate in the DPF is accelerated, the carbon accumulation amount in the DPF is directly corrected, so that the fuel consumption of the engine is increased, and the reliability of the DPF is reduced due to more frequent regeneration of the DPF.
Disclosure of Invention
In order to solve the technical problems, the invention designs a vehicle DPF protection method and a vehicle DPF protection system, which are used for improving the accuracy of safety monitoring in the use process of a vehicle, improving the use reliability of the DPF and reducing the oil consumption.
The invention designs a vehicle DPF protection method, which comprises the following steps:
judging whether the oxygen concentration value in the exhaust gas of the vehicle is in an excessively low state or not;
judging whether the concentration value of nitrogen oxides in the vehicle exhaust gas is in an excessively low state or not;
and if the oxygen concentration value and the nitrogen oxide concentration value in the vehicle exhaust gas are in an excessively low state, adjusting the fuel injection quantity of the engine of the vehicle until the oxygen concentration value and the nitrogen oxide concentration value in the vehicle exhaust gas are both raised to a preset reasonable interval.
In one embodiment, the determining whether the oxygen concentration value in the vehicle exhaust gas is in an excessively low state includes:
acquiring an oxygen concentration value in vehicle exhaust gas, and acquiring a ratio of the oxygen concentration model value to the oxygen concentration value;
judging whether the ratio of the oxygen concentration model value to the oxygen concentration value is larger than a first preset ratio or not;
if so, judging whether the duration time of the ratio of the oxygen concentration model value to the oxygen concentration value being larger than the first preset ratio reaches a first preset time or not;
if so, judging that the oxygen concentration value in the vehicle exhaust gas is in an excessively low state.
In one embodiment, the determining whether the concentration of nitrogen oxides in the vehicle exhaust gas is in an excessively low state includes:
acquiring a nitrogen oxide concentration value in vehicle exhaust gas, and acquiring a ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value;
judging whether the ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value is larger than a second preset ratio or not;
if yes, judging whether the duration time of the ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value being larger than the second preset ratio reaches a second preset time or not;
if yes, judging that the concentration value of the nitrogen oxides in the exhaust gas of the vehicle is in an excessively low state.
In one embodiment, the adjusting the fuel injection amount of the engine of the vehicle until the oxygen concentration value and the nitrogen oxide concentration value in the exhaust gas of the vehicle are both raised to the preset reasonable interval includes:
and adjusting the fuel injection quantity of the engine of the vehicle until the ratio of the oxygen concentration model value to the oxygen concentration value and the ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value are reduced to preset thresholds, wherein the preset thresholds are smaller than the first preset ratio and the second preset ratio.
In one embodiment, the adjusting the fuel injection amount of the engine of the vehicle further includes:
after the fuel injection quantity of the engine of the vehicle is regulated to reach a third preset time, judging whether the ratio of the oxygen concentration value to the oxygen concentration model value is larger than a third preset ratio or not, and judging whether the ratio of the nitrogen oxide concentration value to the nitrogen oxide concentration model value is larger than a fourth preset ratio or not;
and if the ratio of the oxygen concentration model value to the oxygen concentration value is larger than a third preset ratio and the ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value is larger than a fourth preset ratio, correcting the calculated value of the carbon accumulation amount in the DPF.
In one embodiment, the correcting the calculated value of the carbon accumulation amount in the DPF includes:
obtaining a correction coefficient of the carbon accumulation rate in the DPF based on the ratio of the oxygen concentration model value to the oxygen concentration value and the ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value;
and correcting the calculated value of the carbon accumulation amount in the DPF based on the correction coefficient of the carbon accumulation rate in the DPF.
The invention also designs a vehicle DPF protection system, which comprises:
the first judging module is used for judging whether the oxygen concentration value in the exhaust gas of the vehicle is in an excessively low state or not;
the second judging module is used for judging whether the concentration value of the nitrogen oxides in the vehicle exhaust gas is in an excessively low state or not;
and the adjusting module is connected with the first judging module and the second judging module and is used for adjusting the fuel injection quantity of the engine of the vehicle until the oxygen concentration value and the nitrogen oxide concentration value in the vehicle exhaust gas are both lifted to a preset reasonable interval when the oxygen concentration value and the nitrogen oxide concentration value in the vehicle exhaust gas are in an excessively low state.
In one embodiment, the vehicle DPF protection system further includes: the acquisition module is used for acquiring an oxygen concentration value and a nitrogen oxide concentration value in the vehicle exhaust gas, so as to obtain a ratio of the oxygen concentration model value to the oxygen concentration value and a ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value;
the first judging module includes: a first calculation unit and a first judgment unit; the first calculation unit is connected with the acquisition module and is used for acquiring the ratio of the oxygen concentration model value to the oxygen concentration value in the vehicle exhaust gas; the first judging unit is connected with the first calculating unit and is used for judging whether the ratio of the oxygen concentration model value to the oxygen concentration value is larger than a first preset ratio, if so, continuously judging whether the duration time of the ratio of the oxygen concentration model value to the oxygen concentration value larger than the first preset ratio reaches a first preset time, and if so, judging that the oxygen concentration value in the vehicle exhaust gas is in an excessively low state;
the second judging module includes: the second calculating unit and the second judging unit; the second calculation unit is connected with the acquisition module and is used for acquiring the ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value; the second judging unit is connected with the second calculating unit and is used for judging whether the ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value is larger than a second preset ratio, if yes, continuing to judge whether the duration time of the ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value larger than the second preset ratio reaches a second preset time, and if yes, judging that the nitrogen oxide concentration value in the vehicle exhaust gas is in an excessively low state.
In one embodiment, the vehicle DPF protection system further includes:
the third judging module is connected with the adjusting module and is used for judging whether the ratio of the oxygen concentration model value to the oxygen concentration value is larger than a third preset value or not and judging whether the ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value is larger than a fourth preset value or not after the adjusting module adjusts the fuel injection quantity of the engine of the vehicle to reach the third preset time;
and the correction module is connected with the third judgment module and is used for correcting the calculated value of the carbon accumulation amount in the DPF when the ratio of the oxygen concentration model value to the oxygen concentration value is larger than a third preset ratio and the ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value is larger than a fourth preset ratio.
In one embodiment, the vehicle DPF protection system further includes:
the warning module is connected with the third judging module, and sends out a warning signal when the third judging module judges that the ratio of the oxygen concentration model value to the oxygen concentration value is larger than a third preset value and the ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value is larger than a fourth preset value.
The invention has the following beneficial effects:
the invention relates to a vehicle DPF protection method and a protection system, wherein the vehicle DPF protection method accurately monitors the gas concentration in the using process of a vehicle by judging whether the oxygen concentration value in the exhaust gas of the vehicle is in an excessively low state or not and judging whether the nitrogen oxide concentration value in the exhaust gas of the vehicle is in an excessively low state or not; if the oxygen concentration value and the nitrogen oxide concentration value in the vehicle exhaust gas are in an excessively low state, the fuel injection quantity of an engine of the vehicle is adjusted until the oxygen concentration value and the nitrogen oxide concentration value in the vehicle exhaust gas are both raised to a preset reasonable interval. The method for optimizing combustion by adjusting the fuel injection quantity of the engine solves the problems from the source, improves the use reliability of the DPF and realizes the aims of low fuel consumption and high reliability.
In addition, the vehicle DPF protection system judges whether the oxygen concentration value in the vehicle exhaust gas is in an excessively low state or not through the first judging module; judging whether the concentration value of the nitrogen oxides in the exhaust gas of the vehicle is in an excessively low state or not through a second judging module; when the oxygen concentration value and the nitrogen oxide concentration value in the vehicle exhaust gas are in an excessively low state, the fuel injection quantity of the engine of the vehicle is adjusted through the adjusting module until the oxygen concentration value and the nitrogen oxide concentration value in the vehicle exhaust gas are both raised to a preset reasonable interval. The problems of degradation of DPF reliability, DPF regeneration ablation and DPF blockage caused by the acceleration of the carbon accumulation rate in the DPF and the shortening of the actual DPF regeneration period when combustion is deteriorated can be solved.
Drawings
FIG. 1 is a flow chart of a method of vehicle DPF protection in one embodiment of the invention.
Fig. 2 is a flowchart for determining whether an oxygen concentration value in exhaust gas of a vehicle is in an excessively low state in a vehicle DPF protection method according to another embodiment of the present invention.
Fig. 3 is a flowchart for determining whether the concentration of nitrogen oxides in the exhaust gas of the vehicle is in an excessively low state in a vehicle DPF protection method according to another embodiment of the present invention.
FIG. 4 is a flow chart of a method of protecting a vehicle DPF in another embodiment of the invention.
FIG. 5 is a block diagram of a vehicle DPF protection system in one embodiment of the invention.
Reference numerals illustrate:
1. a first judgment module; 11. a first calculation unit; 12. a first judgment unit; 2. a second judging module; 21. a second calculation unit; 22. a second judgment unit; 3. an adjustment module; 4. an acquisition module; 5. a third judging module; 6. a correction module; 7. and a warning module.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In recent years, as the national VI emission regulations of diesel engine are stricter in terms of emission limit of particulate matters in diesel engine emissions, it is required that a DPF (Diesel Particulate Filter ) must be installed for diesel aftertreatment, and the DPF can efficiently trap carbon particles generated by diesel combustion, so that the rate of accumulating carbon particles in the DPF is closely related to the combustion conditions in the engine cylinder. When the air-fuel ratio of the mixture entering the cylinder is low, combustion is deteriorated, generated carbon particles are increased, and at this time, the rate of accumulating carbon particles in the DPF is increased, which means that the DPF is more likely to suffer from ablation or clogging due to an excessive regeneration temperature. For example, when combustion is deteriorated due to abnormality of engine intake air or fuel injection, the rate of carbon accumulation in the DPF is increased, the actual DPF regeneration period is shortened, and the reliability of the DPF is lowered, for example, the regeneration burn-out of the DPF and the clogging of the DPF are caused. In order to avoid the occurrence of the above-described problem, it is necessary to recognize this condition in advance and take measures as early as possible. However, in the prior art, the monitoring accuracy is low; and after recognizing that the carbon accumulation rate in the DPF is accelerated, the carbon accumulation amount in the DPF is directly corrected, so that the fuel consumption of the engine is increased, and the reliability of the DPF is reduced due to more frequent regeneration of the DPF.
In order to solve the technical problems, the invention designs a vehicle DPF protection method and a vehicle DPF protection system, which are used for improving the accuracy of safety monitoring in the use process of a vehicle, improving the use reliability of the DPF and reducing the oil consumption.
The invention designs a vehicle DPF protection method, which is shown in figure 1 and comprises the following steps:
s1: judging whether the oxygen concentration value in the exhaust gas of the vehicle is in an excessively low state or not;
s2: judging whether the concentration value of nitrogen oxides in the exhaust gas of the vehicle is in an excessively low state or not;
s3: if the oxygen concentration value and the nitrogen oxide concentration value in the vehicle exhaust gas are in an excessively low state, the fuel injection quantity of an engine of the vehicle is adjusted until the oxygen concentration value and the nitrogen oxide concentration value in the vehicle exhaust gas are both raised to a preset reasonable interval.
According to the vehicle DPF protection method, the concentration of the gas in the using process of the vehicle is accurately monitored by judging whether the concentration of the oxygen in the exhaust gas of the vehicle is in an excessively low state or not and judging whether the concentration of the nitrogen oxides in the exhaust gas of the vehicle is in an excessively low state or not; if the oxygen concentration value and the nitrogen oxide concentration value in the vehicle exhaust gas are in an excessively low state, the fuel injection quantity of an engine of the vehicle is adjusted until the oxygen concentration value and the nitrogen oxide concentration value in the vehicle exhaust gas are both lifted to a preset reasonable interval, and the combustion is optimized by adjusting the fuel injection quantity of the engine, so that the problems are solved from the source, the use reliability of the DPF is improved, and the aims of low fuel consumption and high reliability are fulfilled.
Referring to fig. 2 in conjunction with fig. 1, in one embodiment, determining whether the oxygen concentration value in the vehicle exhaust is in an excessively low state includes:
s201: acquiring an oxygen concentration value in the exhaust gas of the vehicle, and acquiring a ratio of an oxygen concentration model value to the oxygen concentration value;
s202: judging whether the ratio of the oxygen concentration model value to the oxygen concentration value is larger than a first preset ratio or not;
s203: if so, judging whether the duration time of the ratio of the oxygen concentration model value to the oxygen concentration value being larger than the first preset ratio reaches the first preset time;
s204: if so, the oxygen concentration value in the exhaust gas of the vehicle is determined to be in an excessively low state.
Specifically, the first preset value may include 1.3 to 2, for example, the first preset value may be 1.3, 1.5, 1.8 or 2; in this embodiment, the first preset value is 1.5.
Specifically, the oxygen concentration model value may be obtained by a calculation table of an air-fuel ratio of combustion of the vehicle engine and the oxygen concentration model value, and a specific method of obtaining the oxygen concentration model value by a calculation table of an air-fuel ratio of combustion of the vehicle engine and the oxygen concentration model value is known to those skilled in the art, and will not be described here.
Specifically, the first preset time may include 3 to 15 minutes, for example, the first preset time may be 3 minutes, 5 minutes, 8 minutes, 10 minutes, 12 minutes, or 15 minutes, and in this embodiment, the first preset time is 5 minutes.
In actual use, the first preset value and the first preset time are determined according to actual conditions according to different fuel conditions or different running conditions of the vehicle, and are not limited to the above-mentioned range of values.
Referring to fig. 3 in conjunction with fig. 1, in one embodiment, determining whether the concentration of nitrogen oxides in the vehicle exhaust gas is in an excessively low condition includes:
s301: acquiring a nitrogen oxide concentration value in the exhaust gas of the vehicle, and acquiring a ratio of a nitrogen oxide concentration model value to the nitrogen oxide concentration value;
s302: judging whether the ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value is larger than a second preset ratio;
s303: if yes, judging whether the duration time of the ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value being larger than a second preset ratio reaches a second preset time;
s304: if so, determining that the concentration value of the nitrogen oxides in the exhaust gas of the vehicle is in an excessively low state.
Specifically, the nox concentration model value may be obtained by a calculation table of an air-fuel ratio of combustion of the vehicle engine and the nox concentration model value, and a specific method of obtaining the nox concentration model value by a calculation table of an air-fuel ratio of combustion of the vehicle engine and the nox concentration model value is known to those skilled in the art, and will not be described here.
Specifically, the second preset value may include 1.3 to 2, for example, the second preset value may be 1.3, 1.5, 1.8 or 2; in this embodiment, the second preset value is 1.5.
Specifically, the second preset time may include 3 to 15 minutes, for example, the second preset time may be 3 minutes, 5 minutes, 8 minutes, 10 minutes, 12 minutes, or 15 minutes, and in this embodiment, the second preset time is 5 minutes.
In actual use, the second preset value and the second preset time are determined according to actual conditions according to different fuel conditions of the vehicle or different running conditions of the vehicle, and are not limited to the above-mentioned range of values.
In one embodiment, adjusting the fuel injection amount of the engine of the vehicle until the oxygen concentration value and the nitrogen oxide concentration value in the exhaust gas of the vehicle are both raised to the preset reasonable interval includes:
and adjusting the fuel injection quantity of an engine of the vehicle until the ratio of the oxygen concentration model value to the oxygen concentration value and the ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value are reduced to preset thresholds, wherein the preset thresholds are smaller than a first preset ratio and a second preset ratio.
Specifically, the preset threshold may include 1 to 1.3, for example, the preset threshold may be 1, 1.1, 1.2, or 1.3; in this embodiment, the preset threshold is 1.1.
Referring to fig. 4 in conjunction with fig. 1, in one embodiment, the method further includes, after adjusting the fuel injection amount of the engine of the vehicle:
after the fuel injection quantity of the engine of the vehicle is regulated to reach a third preset time, judging whether the ratio of the oxygen concentration value to the oxygen concentration model value is larger than a third preset ratio or not, and judging whether the ratio of the nitrogen oxide concentration value to the nitrogen oxide concentration model value is larger than a fourth preset ratio or not;
and if the ratio of the oxygen concentration model value to the oxygen concentration value is larger than the third preset ratio and the ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value is larger than the fourth preset ratio, correcting the calculated value of the carbon accumulation amount in the DPF.
That is, as shown in fig. 4, in the present embodiment, the vehicle DPF protection method includes the steps of:
s401: judging whether the oxygen concentration value in the exhaust gas of the vehicle is in an excessively low state or not;
s402: judging whether the concentration value of nitrogen oxides in the exhaust gas of the vehicle is in an excessively low state or not;
s403: if the oxygen concentration value and the nitrogen oxide concentration value in the vehicle exhaust gas are in an excessively low state, adjusting the fuel injection quantity of an engine of the vehicle until the oxygen concentration value and the nitrogen oxide concentration value in the vehicle exhaust gas are both raised to a preset reasonable interval;
s404: after the fuel injection quantity of the engine of the vehicle is regulated to reach a third preset time, judging whether the ratio of the oxygen concentration value to the oxygen concentration model value is larger than a third preset ratio or not, and judging whether the ratio of the nitrogen oxide concentration value to the nitrogen oxide concentration model value is larger than a fourth preset ratio or not;
s405: and if the ratio of the oxygen concentration model value to the oxygen concentration value is larger than the third preset ratio and the ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value is larger than the fourth preset ratio, correcting the calculated value of the carbon accumulation amount in the DPF.
Specifically, the third preset time may include 5 to 20 minutes, for example, the third preset time may be 5 minutes, 8 minutes, 10 minutes, 12 minutes, 15 minutes, or 20 minutes, and in this embodiment, the third preset time is 10 minutes.
Specifically, the third preset value may include 1.1 to 1.5, for example, the third preset value may be 1.1, 1.2, 1.3, 1.4 or 1.5; in this embodiment, the third preset value is 1.3.
Specifically, the fourth preset value may include 1.1 to 1.5, for example, the fourth preset value may be 1.1, 1.2, 1.3, 1.4 or 1.5; in this embodiment, the fourth preset value is 1.3.
In actual use, the third preset time, the third preset value and the fourth preset time are all determined according to actual conditions according to different fuel conditions of the vehicle or different running conditions of the vehicle, and are not limited to the above-mentioned value ranges.
In one embodiment, correcting the calculated value of the carbon accumulation amount in the DPF includes:
obtaining a correction coefficient of the carbon accumulation rate in the DPF based on the ratio of the oxygen concentration model value to the oxygen concentration value and the ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value;
the calculated value of the carbon accumulation amount in the DPF is corrected based on the correction coefficient of the carbon accumulation rate in the DPF.
The present invention also provides a vehicle DPF protection system, as shown in fig. 5, comprising:
a first judging module 1 for judging whether the oxygen concentration value in the exhaust gas of the vehicle is in an excessively low state;
a second judging module 2 for judging whether the concentration value of the nitrogen oxide in the exhaust gas of the vehicle is in an excessively low state;
the adjusting module 3 is connected with the first judging module 1 and the second judging module 2, and is used for adjusting the fuel injection quantity of the engine of the vehicle until the oxygen concentration value and the nitrogen oxide concentration value in the exhaust gas of the vehicle are raised to the preset reasonable interval when the oxygen concentration value and the nitrogen oxide concentration value in the exhaust gas of the vehicle are in an excessively low state.
The vehicle DPF protection system judges whether the oxygen concentration value in the exhaust gas of the vehicle is in an excessively low state or not through the first judging module 1; judging whether the concentration value of the nitrogen oxides in the exhaust gas of the vehicle is in an excessively low state or not by the second judging module 2; when the oxygen concentration value and the nitrogen oxide concentration value in the vehicle exhaust gas are in an excessively low state, the fuel injection quantity of the engine of the vehicle is adjusted through the adjusting module 3 until the oxygen concentration value and the nitrogen oxide concentration value in the vehicle exhaust gas are both raised to a preset reasonable interval.
With continued reference to FIG. 5, in one embodiment, the vehicle DPF protection system further includes: the acquisition module 4 is used for acquiring an oxygen concentration value and a nitrogen oxide concentration value in the vehicle exhaust gas, so as to obtain a ratio of an oxygen concentration model value to the oxygen concentration value and a ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value;
the first judgment module 1 includes: a first calculation unit 11 and a first judgment unit 12; the first calculating unit 11 is connected with the obtaining module 4 and is used for obtaining the ratio of the oxygen concentration model value to the oxygen concentration value in the vehicle exhaust gas; the first judging unit 12 is connected to the first calculating unit 11, and is configured to judge whether a ratio of the oxygen concentration model value to the oxygen concentration value is greater than a first preset ratio, if yes, continuously judge whether a duration time of the ratio of the oxygen concentration model value to the oxygen concentration value being greater than the first preset ratio reaches a first preset time, and if yes, judge that the oxygen concentration value in the exhaust gas of the vehicle is in an excessively low state;
the second judgment module 2 includes: a second calculation unit 21 and a second judgment unit 22; the second calculating unit 21 is connected with the obtaining module 4 and is used for obtaining the ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value; the second judging unit 22 is connected to the second calculating unit 21, and is configured to judge whether the ratio of the nox concentration model value to the nox concentration value is greater than a second preset ratio, if yes, continuously judge whether the duration of the ratio of the nox concentration model value to the nox concentration value greater than the second preset ratio reaches a second preset time, and if yes, judge that the nox concentration value in the exhaust gas of the vehicle is in an excessively low state.
Specifically, the adjustment module 3 may include an engine fuel injection amount adjustment module; the first judgment module 1 and the second judgment module 2 may each include a front NOx sensor (nitrogen oxide sensor) output value monitoring module including a front NOx sensor; monitoring an oxygen concentration value by a front NOx sensor, and outputting an oxygen concentration too low mark if the ratio of the oxygen concentration model value to the oxygen concentration value is too large and the condition lasts for a long enough time; the NOx concentration value is monitored by the front NOx sensor, and if the ratio of the NOx concentration model value to the NOx concentration value is too large and this continues for a sufficiently long time, the NOx concentration too low flag is output. In one embodiment, the fuel injection quantity of the engine is reduced by gradually reducing the fuel injection quantity correction coefficient, so that the ratio of the oxygen concentration model value output by the front NOx sensor to the oxygen concentration value is reduced below a preset threshold value, and the fuel injection quantity adjustment is completed; reducing the fuel injection quantity of the engine by gradually reducing the fuel injection quantity correction coefficient, so that the ratio of the nitrogen oxide concentration model value output by the front NOx sensor to the nitrogen oxide concentration value is reduced below a preset threshold value, and the fuel injection quantity adjustment is completed; after the oil injection quantity is adjusted, the oil injection quantity correction coefficient is locked until the locking time is over.
Specifically, the oxygen concentration model value may be obtained by combining an air-fuel ratio of combustion of the vehicle engine with an oxygen concentration model value calculation table; the nox concentration model value may be obtained by combining an air-fuel ratio of combustion of the vehicle engine with a nox concentration model value calculation table.
Specifically, the first preset value may include 1.3 to 2, for example, the first preset value may be 1.3, 1.5, 1.8 or 2; in this embodiment, the first preset value is 1.5; the first preset time may include 3 to 15 minutes, for example, the first preset time may be 3 minutes, 5 minutes, 8 minutes, 10 minutes, 12 minutes, or 15 minutes, and in this embodiment, the first preset time is 5 minutes.
Specifically, the second preset value may include 1.3 to 2, for example, the second preset value may be 1.3, 1.5, 1.8 or 2; in this embodiment, the second preset value is 1.5; the second preset time may include 3 to 15 minutes, for example, the second preset time may be 3 minutes, 5 minutes, 8 minutes, 10 minutes, 12 minutes, or 15 minutes, and in this embodiment, the second preset time is 5 minutes.
Specifically, the preset threshold may include 1 to 1.3, for example, the preset threshold may be 1, 1.1, 1.2, or 1.3; in this embodiment, the preset threshold is 1.1.
In actual use, the first preset value, the first preset time, the second preset value, the second preset time and the preset threshold are all determined according to actual conditions according to different fuel conditions of the vehicle or different running conditions of the vehicle, and are not limited to the above range of values.
With continued reference to FIG. 5, in one embodiment, the vehicle DPF protection system further includes:
the third judging module 5 is connected with the adjusting module 3 and is used for judging whether the ratio of the oxygen concentration model value to the oxygen concentration value is larger than a third preset value or not and judging whether the ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value is larger than a fourth preset value or not after the fuel injection quantity of the engine of the vehicle adjusted by the adjusting module 3 reaches the third preset time;
the correction module 6 is connected with the third judging module 5, and is used for correcting the calculated value of the carbon accumulation amount in the DPF when the ratio of the oxygen concentration model value to the oxygen concentration value is larger than a third preset ratio and the ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value is larger than a fourth preset ratio.
Specifically, the correction module 6 may include a module for correcting the accumulated amount of carbon in the DPF, and the third preset time may include 5 to 20 minutes, for example, the third preset time may be 5 minutes, 8 minutes, 10 minutes, 12 minutes, 15 minutes or 20 minutes, and in this embodiment, the third preset time is 10 minutes; the third preset value may comprise 1.1 to 1.5, for example the third preset value may be 1.1, 1.2, 1.3, 1.4 or 1.5; in this embodiment, the third preset value is 1.3; the fourth preset value may comprise 1.1 to 1.5, for example the fourth preset value may be 1.1, 1.2, 1.3, 1.4 or 1.5; in this embodiment, the fourth preset value is 1.3.
In actual use, the third preset time, the third preset value and the fourth preset time are all determined according to actual conditions according to different fuel conditions of the vehicle or different running conditions of the vehicle, and are not limited to the above-mentioned value ranges.
With continued reference to FIG. 5, in one embodiment, the vehicle DPF protection system further includes:
the warning module 7 is connected with the third judging module 5, and sends out a warning signal when the third judging module 5 judges that the ratio of the oxygen concentration model value to the oxygen concentration value is larger than a third preset value and the ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value is larger than a fourth preset value.
Specifically, the warning signal sent by the warning module 7 may include one or more of a sound signal, an indicator light signal or a vehicle-mounted animation signal; further, the indicator light may include a malfunction light of the vehicle; in this embodiment, the warning signal is a fault light signal.
The invention relates to a vehicle DPF protection method and a protection system, wherein the vehicle DPF protection method accurately monitors the gas concentration in the using process of a vehicle by judging whether the oxygen concentration value in the exhaust gas of the vehicle is in an excessively low state or not and judging whether the nitrogen oxide concentration value in the exhaust gas of the vehicle is in an excessively low state or not; if the oxygen concentration value and the nitrogen oxide concentration value in the vehicle exhaust gas are in an excessively low state, the fuel injection quantity of an engine of the vehicle is adjusted until the oxygen concentration value and the nitrogen oxide concentration value in the vehicle exhaust gas are both lifted to a preset reasonable interval, and the combustion is optimized by adjusting the fuel injection quantity of the engine, so that the problems are solved from the source, the use reliability of the DPF is improved, and the aims of low fuel consumption and high reliability are fulfilled. And when the method for adjusting the fuel injection amount of the engine is invalid, the calculated value of the carbon accumulation amount in the DPF is corrected, so that the DPF is temporarily protected. In addition, the vehicle DPF protection system judges whether the oxygen concentration value in the vehicle exhaust gas is in an excessively low state or not through the first judging module 1; judging whether the concentration value of the nitrogen oxides in the exhaust gas of the vehicle is in an excessively low state or not by the second judging module 2; when the oxygen concentration value and the nitrogen oxide concentration value in the exhaust gas of the vehicle are in an excessively low state, the adjusting module 3 adjusts the fuel injection quantity of the engine of the vehicle until the oxygen concentration value and the nitrogen oxide concentration value in the exhaust gas of the vehicle are both raised to a preset reasonable interval, so that the problems of DPF regeneration ablation and DPF blocking caused by the fact that the carbon accumulation rate in the DPF is accelerated and the actual DPF regeneration period is shortened when combustion is deteriorated can be solved; when the method for adjusting the fuel injection quantity of the engine is invalid, the calculated value of the carbon accumulation quantity in the DPF is corrected through the correction module 6, and meanwhile, a warning signal is sent through the warning module 7, so that a certain time is reserved for a user to go to a service station for maintenance, and the optimization target of the vehicle cost of the user is realized.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. A vehicle DPF protection method, characterized by comprising:
acquiring a nitrogen oxide concentration value in vehicle exhaust gas, and acquiring a ratio of a nitrogen oxide concentration model value to the nitrogen oxide concentration value;
judging whether the ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value is larger than a second preset ratio or not;
if yes, judging whether the duration time of the ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value being larger than the second preset ratio reaches a second preset time or not;
if yes, judging that the concentration value of the nitrogen oxides in the vehicle exhaust gas is in an excessively low state;
acquiring an oxygen concentration value in the exhaust gas of the vehicle, and acquiring a ratio of an oxygen concentration model value to the oxygen concentration value;
judging whether the ratio of the oxygen concentration model value to the oxygen concentration value is larger than a first preset ratio or not;
if so, judging whether the duration time of the ratio of the oxygen concentration model value to the oxygen concentration value being larger than the first preset ratio reaches a first preset time or not;
if yes, judging that the oxygen concentration value in the vehicle exhaust gas is in an excessively low state;
and if the oxygen concentration value and the nitrogen oxide concentration value in the vehicle exhaust gas are in an excessively low state, adjusting the fuel injection quantity of the engine of the vehicle until the ratio of the oxygen concentration model value to the oxygen concentration value and the ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value are reduced to preset thresholds, wherein the preset thresholds are smaller than the first preset ratio and the second preset ratio.
2. The vehicle DPF protection method according to claim 1, wherein the first preset time includes 3 to 15 minutes.
3. The vehicle DPF protection method according to claim 1, wherein the second preset time includes 3 to 15 minutes.
4. The vehicle DPF protection method according to claim 1, characterized in that the adjusting the fuel injection amount of the engine of the vehicle further includes:
after the fuel injection quantity of the engine of the vehicle is regulated to reach a third preset time, judging whether the ratio of the oxygen concentration value to the oxygen concentration model value is larger than a third preset ratio or not, and judging whether the ratio of the nitrogen oxide concentration value to the nitrogen oxide concentration model value is larger than a fourth preset ratio or not;
and if the ratio of the oxygen concentration model value to the oxygen concentration value is larger than a third preset ratio and the ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value is larger than a fourth preset ratio, correcting the calculated value of the carbon accumulation amount in the DPF.
5. The method of protecting a vehicle DPF according to claim 4, wherein correcting the calculated value of the carbon accumulation amount in the DPF includes:
obtaining a correction coefficient of the carbon accumulation rate in the DPF based on the ratio of the oxygen concentration model value to the oxygen concentration value and the ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value;
and correcting the calculated value of the carbon accumulation amount in the DPF based on the correction coefficient of the carbon accumulation rate in the DPF.
6. The vehicle DPF protection method according to claim 4, wherein the third preset time includes 5 to 20 minutes.
7. A vehicle DPF protection system, characterized in that the vehicle DPF protection system comprises:
the acquisition module is used for acquiring an oxygen concentration value and a nitrogen oxide concentration value in the vehicle exhaust gas, so as to obtain a ratio of an oxygen concentration model value to the oxygen concentration value and a ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value;
the first judging module comprises: a first calculation unit and a first judgment unit; the first calculation unit is connected with the acquisition module and is used for acquiring the ratio of the oxygen concentration model value to the oxygen concentration value in the vehicle exhaust gas; the first judging unit is connected with the first calculating unit and is used for judging whether the ratio of the oxygen concentration model value to the oxygen concentration value is larger than a first preset ratio, if so, continuously judging whether the duration time of the ratio of the oxygen concentration model value to the oxygen concentration value larger than the first preset ratio reaches a first preset time, and if so, judging that the oxygen concentration value in the vehicle exhaust gas is in an excessively low state;
the second judging module comprises: the second calculating unit and the second judging unit; the second calculation unit is connected with the acquisition module and is used for acquiring the ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value; the second judging unit is connected with the second calculating unit and is used for judging whether the ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value is larger than a second preset ratio, if yes, continuing to judge whether the duration time of the ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value larger than the second preset ratio reaches a second preset time, and if yes, judging that the nitrogen oxide concentration value in the vehicle exhaust gas is in an excessively low state;
the adjusting module is connected with the first judging module and the second judging module and is used for adjusting the fuel injection quantity of the engine of the vehicle when the oxygen concentration value and the nitrogen oxide concentration value in the exhaust gas of the vehicle are in an excessively low state until the ratio of the oxygen concentration model value to the oxygen concentration value and the ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value are reduced to preset thresholds, and the preset thresholds are smaller than the first preset ratio and the second preset ratio.
8. The vehicle DPF protection system according to claim 7, further comprising:
the third judging module is connected with the adjusting module and is used for judging whether the ratio of the oxygen concentration model value to the oxygen concentration value is larger than a third preset value or not and judging whether the ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value is larger than a fourth preset value or not after the adjusting module adjusts the fuel injection quantity of the engine of the vehicle to reach the third preset time;
and the correction module is connected with the third judgment module and is used for correcting the calculated value of the carbon accumulation amount in the DPF when the ratio of the oxygen concentration model value to the oxygen concentration value is larger than a third preset ratio and the ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value is larger than a fourth preset ratio.
9. The vehicle DPF protection system according to claim 8, further comprising:
the warning module is connected with the third judging module, and sends out a warning signal when the third judging module judges that the ratio of the oxygen concentration model value to the oxygen concentration value is larger than a third preset value and the ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value is larger than a fourth preset value.
10. The vehicle DPF protection system of claim 9, wherein the alert signal includes one or more of an audible signal, an indicator light signal, or an on-board animated signal.
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