CN114151217A - Vehicle DPF protection method and protection system - Google Patents
Vehicle DPF protection method and protection system Download PDFInfo
- Publication number
- CN114151217A CN114151217A CN202111434006.6A CN202111434006A CN114151217A CN 114151217 A CN114151217 A CN 114151217A CN 202111434006 A CN202111434006 A CN 202111434006A CN 114151217 A CN114151217 A CN 114151217A
- Authority
- CN
- China
- Prior art keywords
- value
- ratio
- oxygen concentration
- nitrogen oxide
- vehicle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 40
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 474
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 162
- 239000001301 oxygen Substances 0.000 claims abstract description 162
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 162
- 239000007789 gas Substances 0.000 claims abstract description 98
- 239000000446 fuel Substances 0.000 claims abstract description 64
- 238000002347 injection Methods 0.000 claims abstract description 47
- 239000007924 injection Substances 0.000 claims abstract description 47
- 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 27
- 238000012937 correction Methods 0.000 claims description 13
- 238000002485 combustion reaction Methods 0.000 abstract description 20
- 238000012544 monitoring process Methods 0.000 abstract description 9
- 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 5
- 230000005856 abnormality Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000010705 motor oil Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 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
- 239000000243 solution Substances 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
Images
Classifications
-
- 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
-
- 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
-
- 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 vehicle DPF protection system, wherein the vehicle DPF protection method comprises the following steps: judging whether the oxygen concentration value in the vehicle exhaust gas is in an excessively low state; judging whether the concentration value of nitrogen oxides in the exhaust gas of the vehicle is in an excessively low state; if the oxygen concentration value and the nitrogen oxide concentration value in the vehicle exhaust gas are both 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 increased to a preset reasonable interval; the method comprises the steps of accurately monitoring the gas concentration in the use process of a vehicle by judging whether the oxygen concentration value in the vehicle exhaust gas is in an excessively low state or not and judging whether the nitrogen oxide concentration value in the vehicle exhaust gas 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 emission limit of Particulate matters in Diesel engine emissions is more strict by the VI emission regulation of Diesel countries, it is required that a DPF (Diesel Particulate Filter) must be installed for Diesel after-treatment, 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 condition 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 the speed of accumulating the carbon particles in the DPF is increased, which means that the DPF is more likely to be ablated or blocked due to too high regeneration temperature, for example, when combustion is deteriorated due to abnormality of engine intake or fuel injection, the speed of accumulating carbon in the DPF is increased, the actual regeneration period of the DPF is shortened, and the problem of the reliability reduction of the DPF, for example, the problem of DPF regeneration ablation and DPF blockage, is caused. In order to avoid the above problems, it is necessary to recognize this situation in advance and take measures as early as possible. However, in the prior art, the monitoring accuracy is low; and after the fact that the carbon accumulation rate in the DPF is accelerated is recognized, the carbon accumulation amount in the DPF is directly corrected, so that the engine oil consumption 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 so as to improve the accuracy of safety monitoring in the use process of a vehicle, improve the use reliability of the DPF and reduce the oil consumption.
The invention designs a vehicle DPF protection method, which comprises the following steps:
judging whether the oxygen concentration value in the vehicle exhaust gas is in an excessively low state;
judging whether the concentration value of nitrogen oxides 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 both 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 increased to a preset reasonable interval.
In one embodiment, the determining whether the oxygen concentration value in the exhaust gas of the vehicle 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 that the ratio of the oxygen concentration model value to the oxygen concentration value is greater than the first preset ratio reaches a first preset time or not;
and if so, determining that the oxygen concentration value in the vehicle exhaust gas is in an excessively low state.
In one embodiment, the determining whether the concentration value of nitrogen oxides in the exhaust gas of the vehicle is in an excessively low state includes:
acquiring a concentration value of nitrogen oxide in vehicle exhaust gas, and acquiring a ratio of the model value of the concentration of nitrogen oxide to the concentration value of nitrogen oxide;
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 so, judging whether the duration time that the ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value is greater than the second preset ratio reaches a second preset time or not;
and if so, determining that the concentration value of the nitrogen oxides in the vehicle exhaust gas 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 increased to a 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 both 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 comprises:
after the fuel injection quantity of the engine of the vehicle is adjusted 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, 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;
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 accumulated amount of carbon in the DPF comprises:
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;
correcting the calculated value of the carbon accumulation amount in the DPF based on a correction coefficient of the carbon accumulation rate in the DPF.
The present invention also contemplates a vehicle DPF protection system, comprising:
the first judgment module is used for judging whether the oxygen concentration value in the vehicle exhaust gas is in an excessively low state or not;
the second judgment 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 an engine of the vehicle when the oxygen concentration value in the vehicle exhaust gas and the nitrogen oxide concentration value are both in a low state until the oxygen concentration value in the vehicle exhaust gas and the nitrogen oxide concentration value are both promoted to a preset reasonable interval.
In one embodiment, the vehicle DPF protection system further 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 acquire 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 comprises: a first calculating unit and a first judging 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 or not, if so, continuously judging whether the duration time that the ratio of the oxygen concentration model value to the oxygen concentration value is larger than the first preset ratio reaches a first preset time or not, 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: a second calculating unit and a second judging unit; the second calculating unit is connected with the obtaining module and is used for obtaining 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 or not, if so, continuously judging whether the duration time that the ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value is larger than the second preset ratio reaches a second preset time or not, and if so, 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 comprises:
the third judgment module is connected with the adjustment module and used for judging whether the ratio of the oxygen concentration model value to the oxygen concentration value is greater 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 greater than a fourth preset value or not after the adjustment module adjusts the fuel injection quantity of the engine of the vehicle to reach a third preset time;
and the correcting module is connected with the third judging module and 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 comprises:
and the warning module is connected with the third judging module and sends a warning signal when the third judging module judges that the ratio of the oxygen concentration model value to the oxygen concentration value is greater than a third preset value and the ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value is greater than a fourth preset value.
The invention has the following beneficial effects:
the vehicle DPF protection method accurately monitors the gas concentration in the use process of a vehicle by judging whether the oxygen concentration value in the vehicle exhaust gas is in an excessively low state or not and judging whether the nitrogen oxide concentration value 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 both 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 increased 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 through the first judgment module; judging whether the concentration value of nitrogen oxides in the exhaust gas of the vehicle is in an excessively low state through a second judgment module; when the oxygen concentration value and the nitrogen oxide concentration value in the vehicle exhaust gas are both in a low state through the adjusting module, 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 all lifted to a preset reasonable interval. The problems of DPF reliability reduction caused by accelerated carbon accumulation rate in the DPF and shortened actual DPF regeneration period when combustion is deteriorated, DPF regeneration ablation and DPF blockage can be solved.
Drawings
FIG. 1 is a flow chart of a method for DPF protection in a vehicle in one embodiment of the invention.
Fig. 2 is a flowchart of determining whether an oxygen concentration value in exhaust gas of a vehicle is in an excessively low state in a DPF protection method for a vehicle according to another embodiment of the present invention.
Fig. 3 is a flow chart of determining whether a concentration value of nitrogen oxides in exhaust gas of a vehicle is in an excessively low state in a DPF protection method for the vehicle according to another embodiment of the present invention.
FIG. 4 is a flow chart of a method for DPF protection in a vehicle in another embodiment of the invention.
FIG. 5 is a block diagram of a vehicle DPF protection system in one embodiment of the invention.
Description of reference numerals:
1. a first judgment module; 11. a first calculation unit; 12. a first judgment unit; 2. a second judgment module; 21. a second calculation unit; 22. a second judgment unit; 3. an adjustment module; 4. an acquisition module; 5. a third judgment module; 6. a correction module; 7. and an alarm module.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" 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 as used herein are for illustrative purposes only and do not denote a unique embodiment.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In recent years, as the emission limit of Particulate matters in Diesel engine emissions is more strict by the VI emission regulation of Diesel countries, it is required that a DPF (Diesel Particulate Filter) must be installed for Diesel after-treatment, 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 condition in the engine cylinder. When the air-fuel ratio of the mixture gas entering the cylinder is low, the combustion is deteriorated, the generated carbon particles are increased, and the rate of accumulating the carbon particles in the DPF is increased, which means that the DPF is more likely to suffer from ablation or clogging due to excessive regeneration temperature. For example, when combustion deteriorates due to an abnormality in engine intake air or fuel injection, the rate of carbon accumulation in the DPF increases, and the actual DPF regeneration period shortens, resulting in problems of reduced DPF reliability, such as problems of DPF regeneration ablation and DPF clogging. In order to avoid the above problems, it is necessary to recognize this situation in advance and take measures as early as possible. However, in the prior art, the monitoring accuracy is low; and after the fact that the carbon accumulation rate in the DPF is accelerated is recognized, the carbon accumulation amount in the DPF is directly corrected, so that the engine oil consumption 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 so as to improve the accuracy of safety monitoring in the use process of a vehicle, improve the use reliability of the DPF and reduce the oil consumption.
The invention designs a vehicle DPF protection method, as shown in FIG. 1, the vehicle DPF protection method comprises:
s1: judging whether the oxygen concentration value in the vehicle exhaust gas is in an excessively low state;
s2: judging whether the concentration value of nitrogen oxides in the exhaust gas of the vehicle is in an excessively low state;
s3: and if the oxygen concentration value and the nitrogen oxide concentration value in the vehicle exhaust gas are both 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 increased to a preset reasonable interval.
The DPF protection method of the vehicle accurately monitors the gas concentration in the using process of the vehicle by judging whether the oxygen concentration value in the exhaust gas of the vehicle is in an over-low state or not and judging whether the nitrogen oxide concentration value in the exhaust gas of the vehicle is in an over-low state or not; if the oxygen concentration value and the nitrogen oxide concentration value in the vehicle exhaust gas are both 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 increased to a preset reasonable interval, and 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 achieves the purposes of low fuel consumption and high reliability.
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 comprises:
s201: acquiring an oxygen concentration value in vehicle exhaust gas, 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 that the ratio of the oxygen concentration model value to the oxygen concentration value is greater than a first preset ratio reaches a first preset time or not;
s204: if so, it is determined that the oxygen concentration value in the vehicle exhaust gas is 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 model value of oxygen concentration may be obtained by combining the air-fuel ratio of combustion of the vehicle engine with the model value of oxygen concentration calculation table, and a specific method for obtaining the model value of oxygen concentration by combining the air-fuel ratio of combustion of the vehicle engine with the model value of oxygen concentration calculation table is known to those skilled in the art, and will not be described in detail herein.
Specifically, the first predetermined time may include 3 to 15 minutes, for example, the first predetermined time may be 3 minutes, 5 minutes, 8 minutes, 10 minutes, 12 minutes or 15 minutes, and in this embodiment, the first predetermined time is 5 minutes.
It should be noted that, in actual use, the first preset value and the first 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 value range.
Referring to FIG. 3 in conjunction with FIG. 1, in one embodiment, determining whether a concentration value of NOx in exhaust gas of a vehicle is in a too low condition comprises:
s301: acquiring a concentration value of nitrogen oxides in vehicle exhaust gas, and acquiring a ratio of a model value of the concentration of the nitrogen oxides to the concentration value of the nitrogen oxides;
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 or not;
s303: if so, judging whether the duration time that the ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value is greater than a second preset ratio reaches a second preset time or not;
s304: if yes, the concentration value of the nitrogen oxides in the vehicle exhaust gas is determined to be in an excessively low state.
Specifically, the model value of the concentration of nitrogen oxide may be obtained by combining an air-fuel ratio of combustion of the vehicle engine with a model value of the concentration of nitrogen oxide, and a specific method for obtaining the model value of the concentration of nitrogen oxide by combining the air-fuel ratio of combustion of the vehicle engine with the model value of the concentration of nitrogen oxide is known to those skilled in the art, and will not be described in detail herein.
Specifically, the second predetermined value may include 1.3 to 2, for example, the second predetermined value may be 1.3, 1.5, 1.8 or 2; in this embodiment, the second preset value is 1.5.
Specifically, the second predetermined time may include 3 to 15 minutes, for example, the second predetermined time may be 3 minutes, 5 minutes, 8 minutes, 10 minutes, 12 minutes or 15 minutes, and in this embodiment, the second predetermined time is 5 minutes.
It should be noted that, 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 value range.
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 increased to a preset reasonable interval comprises:
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 both reduced to a preset threshold value, wherein the preset threshold value is 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, after adjusting the fuel injection amount of the engine of the vehicle, the method further includes:
after the fuel injection quantity of an engine of the vehicle is adjusted 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 greater than a third preset ratio and the ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value is greater than a fourth preset ratio, correcting the calculated value of the carbon accumulation amount in the DPF.
As shown in fig. 4, in the present embodiment, the DPF protection method for a vehicle includes the steps of:
s401: judging whether the oxygen concentration value in the vehicle exhaust gas is in an excessively low state;
s402: judging whether the concentration value of nitrogen oxides in the exhaust gas of the vehicle is in an excessively low state;
s403: if the oxygen concentration value and the nitrogen oxide concentration value in the vehicle exhaust gas are both 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 increased to a preset reasonable interval;
s404: after the fuel injection quantity of an engine of the vehicle is adjusted 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 greater than a third preset ratio and the ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value is greater than a fourth preset ratio, correcting the calculated value of the carbon accumulation amount in the DPF.
Specifically, the third predetermined time may include 5 to 20 minutes, for example, the third predetermined time may be 5 minutes, 8 minutes, 10 minutes, 12 minutes, 15 minutes or 20 minutes, and in this embodiment, the third predetermined time is 10 minutes.
Specifically, the third predetermined value may include 1.1 to 1.5, for example, the third predetermined 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 predetermined value may include 1.1 to 1.5, for example, the fourth predetermined value may be 1.1, 1.2, 1.3, 1.4 or 1.5; in this embodiment, the fourth preset value is 1.3.
It should be noted that, in actual use, the third preset time, the third preset value and the fourth preset time are determined according to actual conditions according to different fuel conditions of vehicles or different running conditions of vehicles, and are not limited to the above value range.
In one embodiment, the correcting the calculated value of the carbon accumulation amount in the DPF comprises:
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 a correction coefficient of the carbon accumulation rate in the DPF.
The present invention also designs a DPF protection system for a vehicle, as shown in fig. 5, the DPF protection system for a vehicle includes:
the first judgment module 1 is used for judging whether the oxygen concentration value in the vehicle exhaust gas is in an excessively low state;
the second judgment module 2 is used for judging whether the concentration value of the nitrogen oxides in the vehicle exhaust gas is in an excessively low state;
and 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 an engine of the vehicle when the oxygen concentration value and the nitrogen oxide concentration value in the vehicle exhaust gas are both in a low state until the oxygen concentration value and the nitrogen oxide concentration value in the vehicle exhaust gas are both increased to a preset reasonable interval.
The DPF protection system of the vehicle judges whether the oxygen concentration value in the exhaust gas of the vehicle is in a too low state through a first judgment module 1; whether the concentration value of nitrogen oxides in the exhaust gas of the vehicle is in an excessively low state is judged through a second judgment module 2; when the oxygen concentration value and the nitrogen oxide concentration value in the vehicle exhaust gas are both in a low state through the adjusting module 3, 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 increased to a preset reasonable interval.
With continued reference to FIG. 5, in one embodiment, the vehicle DPF protection system further comprises: the acquisition module 4 is used for acquiring an oxygen concentration value and a nitrogen oxide concentration value in the vehicle exhaust gas, and further acquiring 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 judgment module 1 includes: a first calculating unit 11 and a first judging unit 12; the first calculating unit 11 is connected with the obtaining module 4 and is used for obtaining a ratio of an oxygen concentration model value to an oxygen concentration value in 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 model value of oxygen concentration to the value of oxygen concentration is greater than a first preset ratio, if so, continue to judge whether a duration that the ratio of the model value of oxygen concentration to the value of oxygen concentration is greater than the first preset ratio reaches a first preset time, and if so, judge that the value of oxygen concentration in the exhaust gas of the vehicle is in an excessively low state;
the second determination module 2 includes: a second calculating unit 21 and a second judging unit 22; the second calculating unit 21 is connected to the obtaining module 4, and is configured to obtain a ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value; the second determining unit 22 is connected to the second calculating unit 21, and is configured to determine whether a ratio of the model value of nitrogen oxide concentration to the concentration value of nitrogen oxide is greater than a second preset ratio, if so, continue to determine whether a duration that the ratio of the model value of nitrogen oxide concentration to the concentration value of nitrogen oxide is greater than the second preset ratio reaches a second preset time, and if so, determine that the concentration value of nitrogen oxide 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 judging module 1 and the second judging module 2 can both comprise a front NOx sensor (nitrogen oxide sensor) output value monitoring module, and the front NOx sensor output value monitoring module comprises a front NOx sensor; monitoring an oxygen concentration value through a front NOx sensor, and if the ratio of an oxygen concentration model value to the oxygen concentration value is too large and the condition lasts for a long enough time, outputting an oxygen concentration too low mark; and monitoring the NOx concentration value through a front NOx sensor, and if the ratio of the NOx concentration model value to the NOx concentration value is too large and the condition lasts for a long enough time, outputting an NOx concentration too low mark. 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 to be below a preset threshold value, and the fuel injection quantity adjustment is completed; the fuel injection quantity of the engine is reduced by gradually reducing the fuel injection quantity correction coefficient, so that the ratio of the concentration model value of the nitrogen oxide output by the front NOx sensor to the concentration value of the nitrogen oxide is reduced to be below a preset threshold value, and the adjustment of the fuel injection quantity is finished; and after the adjustment of the fuel injection quantity is finished, the fuel injection quantity correction coefficient is locked until the locking time is finished.
Specifically, the oxygen concentration model value may be obtained by combining an air-fuel ratio of combustion of the vehicle engine with the oxygen concentration model value calculation table; the model value of the concentration of nitrogen oxide can be obtained by combining the air-fuel ratio of combustion of the vehicle engine with the model value of the concentration of nitrogen oxide.
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 predetermined time may include 3 to 15 minutes, for example, the first predetermined time may be 3 minutes, 5 minutes, 8 minutes, 10 minutes, 12 minutes or 15 minutes, and in this embodiment, the first predetermined time is 5 minutes.
Specifically, the second predetermined value may include 1.3 to 2, for example, the second predetermined value may be 1.3, 1.5, 1.8 or 2; in this embodiment, the second preset value is 1.5; the second predetermined time may include 3 to 15 minutes, for example, the second predetermined time may be 3 minutes, 5 minutes, 8 minutes, 10 minutes, 12 minutes or 15 minutes, and in this embodiment, the second predetermined 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.
It should be noted that, in actual use, the first preset value, the first preset time, the second preset value, the second preset time, and the preset threshold are determined according to actual conditions and are not limited to the above value range according to different fuel conditions of vehicles or different operating conditions of vehicles.
With continued reference to FIG. 5, in one embodiment, the vehicle DPF protection system further comprises:
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 greater 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 greater than a fourth preset value or not after the adjusting module 3 adjusts the fuel injection quantity of the engine of the vehicle to reach a third preset time;
and the correcting 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 greater than a third preset ratio and the ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value is greater than a fourth preset ratio.
Specifically, the correction module 6 may include a carbon accumulation correction module 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 predetermined value can include 1.1 to 1.5, such as 1.1, 1.2, 1.3, 1.4 or 1.5; in this embodiment, the third preset value is 1.3; the fourth predetermined value can include 1.1 to 1.5, such as 1.1, 1.2, 1.3, 1.4 or 1.5; in this embodiment, the fourth preset value is 1.3.
It should be noted that, in actual use, the third preset time, the third preset value and the fourth preset time are determined according to actual conditions according to different fuel conditions of vehicles or different running conditions of vehicles, and are not limited to the above value range.
With continued reference to FIG. 5, in one embodiment, the vehicle DPF protection system further comprises:
and 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 greater than a third preset value and the ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value is greater than a fourth preset value.
Specifically, the warning signal emitted 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 vehicle DPF protection method accurately monitors the gas concentration in the use process of a vehicle by judging whether the oxygen concentration value in the vehicle exhaust gas is in an excessively low state or not and judging whether the nitrogen oxide concentration value in the vehicle exhaust gas 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 both 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 increased to a preset reasonable interval, and 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 achieves the purposes of low fuel consumption and high reliability. And when the method for adjusting the fuel injection quantity of the engine is invalid, the calculation value of the carbon accumulation quantity in the DPF is corrected, and 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 through the first judgment module 1; whether the concentration value of nitrogen oxides in the exhaust gas of the vehicle is in an excessively low state is judged through a second judgment module 2; when the oxygen concentration value and the nitrogen oxide concentration value in the vehicle exhaust gas are both in an excessively low state, the adjustment module 3 adjusts 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 increased to a preset reasonable interval, so that the problems of DPF reliability reduction, DPF regeneration ablation and DPF blockage caused by accelerated carbon accumulation rate in the DPF and shortened actual DPF regeneration period during combustion deterioration can be solved; when the method for adjusting the fuel injection quantity of the engine is invalid, the calculation value of the carbon accumulation quantity in the DPF is corrected through the correction module 6, meanwhile, the warning module 7 sends out a warning signal, a certain time is set for a user to go to a service station for maintenance, and the optimization target of the vehicle cost of the user is achieved.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A vehicle DPF protection method, characterized by comprising:
judging whether the oxygen concentration value in the vehicle exhaust gas is in an excessively low state;
judging whether the concentration value of nitrogen oxides 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 both 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 increased to a preset reasonable interval.
2. The vehicle DPF protection method of claim 1, wherein said determining whether the oxygen concentration value in the vehicle exhaust gas is in an excessively low state comprises:
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 that the ratio of the oxygen concentration model value to the oxygen concentration value is greater than the first preset ratio reaches a first preset time or not;
and if so, determining that the oxygen concentration value in the vehicle exhaust gas is in an excessively low state.
3. The vehicle DPF protection method of claim 2, wherein said determining whether the concentration value of nitrogen oxides in the vehicle exhaust gas is in a too low state comprises:
acquiring a concentration value of nitrogen oxide in vehicle exhaust gas, and acquiring a ratio of the model value of the concentration of nitrogen oxide to the concentration value of nitrogen oxide;
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 so, judging whether the duration time that the ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value is greater than the second preset ratio reaches a second preset time or not;
and if so, determining that the concentration value of the nitrogen oxides in the vehicle exhaust gas is in an excessively low state.
4. The DPF protection method for a vehicle of claim 3, wherein 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 increased to a preset reasonable range comprises:
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 both reduced to preset thresholds, wherein the preset thresholds are smaller than the first preset ratio and the second preset ratio.
5. The DPF protection method for a vehicle according to claim 3, further comprising, after the adjusting the fuel injection amount of the engine of the vehicle:
after the fuel injection quantity of the engine of the vehicle is adjusted 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, 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;
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.
6. The vehicular DPF protection method of claim 5, wherein the correcting the calculated value of the accumulated amount of carbon in the DPF comprises:
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;
correcting the calculated value of the carbon accumulation amount in the DPF based on a correction coefficient of the carbon accumulation rate in the DPF.
7. A vehicle DPF protection system, comprising:
the first judgment module is used for judging whether the oxygen concentration value in the vehicle exhaust gas is in an excessively low state or not;
the second judgment 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 an engine of the vehicle when the oxygen concentration value in the vehicle exhaust gas and the nitrogen oxide concentration value are both in a low state until the oxygen concentration value in the vehicle exhaust gas and the nitrogen oxide concentration value are both promoted to a preset reasonable interval.
8. The vehicle DPF protection system of claim 7, further comprising: 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 acquire 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 comprises: a first calculating unit and a first judging 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 or not, if so, continuously judging whether the duration time that the ratio of the oxygen concentration model value to the oxygen concentration value is larger than the first preset ratio reaches a first preset time or not, 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: a second calculating unit and a second judging unit; the second calculating unit is connected with the obtaining module and is used for obtaining 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 or not, if so, continuously judging whether the duration time that the ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value is larger than the second preset ratio reaches a second preset time or not, and if so, judging that the nitrogen oxide concentration value in the vehicle exhaust gas is in an excessively low state.
9. The vehicle DPF protection system of claim 8, further comprising:
the third judgment module is connected with the adjustment module and used for judging whether the ratio of the oxygen concentration model value to the oxygen concentration value is greater 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 greater than a fourth preset value or not after the adjustment module adjusts the fuel injection quantity of the engine of the vehicle to reach a third preset time;
and the correcting module is connected with the third judging module and 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.
10. The vehicle DPF protection system of claim 9, further comprising:
and the warning module is connected with the third judging module and sends a warning signal when the third judging module judges that the ratio of the oxygen concentration model value to the oxygen concentration value is greater than a third preset value and the ratio of the nitrogen oxide concentration model value to the nitrogen oxide concentration value is greater than a fourth preset value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111434006.6A CN114151217B (en) | 2021-11-29 | 2021-11-29 | Vehicle DPF protection method and protection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111434006.6A CN114151217B (en) | 2021-11-29 | 2021-11-29 | Vehicle DPF protection method and protection system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114151217A true CN114151217A (en) | 2022-03-08 |
| CN114151217B CN114151217B (en) | 2023-12-22 |
Family
ID=80454278
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111434006.6A Active CN114151217B (en) | 2021-11-29 | 2021-11-29 | Vehicle DPF protection method and protection system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114151217B (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6195987B1 (en) * | 1998-11-25 | 2001-03-06 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas purifying apparatus of internal combustion engine |
| US20010028868A1 (en) * | 2000-04-10 | 2001-10-11 | Honda Giken Kogyo Kabushiki Kaisha | Exhaust emission control system for internal combustion engine |
| US6487851B1 (en) * | 1999-04-06 | 2002-12-03 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Exhaust emission control device of internal combustion engine |
| EP1529944A1 (en) * | 2003-11-06 | 2005-05-11 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas control apparatus and method for internal combustion engine |
| US20080282680A1 (en) * | 2005-10-27 | 2008-11-20 | Renault S.A.S. | Device for Treating Nitrogen Oxides of Motor Vehicle Exhaust Gases |
| CN102089506A (en) * | 2009-10-06 | 2011-06-08 | 丰田自动车株式会社 | Exhaust purifying system for internal combustion engine |
| US20120255286A1 (en) * | 2011-04-05 | 2012-10-11 | Honda Motor Co., Ltd. | Exhaust purification system for internal combustion engine |
| US20140311428A1 (en) * | 2013-04-19 | 2014-10-23 | Kabushiki Kaisha Toyota Chuo Kenkyusho | Internal combustion engine |
| CN105443202A (en) * | 2014-09-23 | 2016-03-30 | 福特环球技术公司 | Method of controlling NOx by PNA |
| US20160169135A1 (en) * | 2014-12-12 | 2016-06-16 | General Electric Company | Method and system for control of emissions in exhaust aftertreatment system |
| JP2020026756A (en) * | 2018-08-10 | 2020-02-20 | 日本特殊陶業株式会社 | Engine control device and engine control method |
| CN112780427A (en) * | 2021-01-20 | 2021-05-11 | 潍柴动力股份有限公司 | Control method and device of engine system |
-
2021
- 2021-11-29 CN CN202111434006.6A patent/CN114151217B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6195987B1 (en) * | 1998-11-25 | 2001-03-06 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas purifying apparatus of internal combustion engine |
| US6487851B1 (en) * | 1999-04-06 | 2002-12-03 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Exhaust emission control device of internal combustion engine |
| US20010028868A1 (en) * | 2000-04-10 | 2001-10-11 | Honda Giken Kogyo Kabushiki Kaisha | Exhaust emission control system for internal combustion engine |
| EP1529944A1 (en) * | 2003-11-06 | 2005-05-11 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas control apparatus and method for internal combustion engine |
| US20080282680A1 (en) * | 2005-10-27 | 2008-11-20 | Renault S.A.S. | Device for Treating Nitrogen Oxides of Motor Vehicle Exhaust Gases |
| CN102089506A (en) * | 2009-10-06 | 2011-06-08 | 丰田自动车株式会社 | Exhaust purifying system for internal combustion engine |
| US20120255286A1 (en) * | 2011-04-05 | 2012-10-11 | Honda Motor Co., Ltd. | Exhaust purification system for internal combustion engine |
| US20140311428A1 (en) * | 2013-04-19 | 2014-10-23 | Kabushiki Kaisha Toyota Chuo Kenkyusho | Internal combustion engine |
| CN105443202A (en) * | 2014-09-23 | 2016-03-30 | 福特环球技术公司 | Method of controlling NOx by PNA |
| US20160169135A1 (en) * | 2014-12-12 | 2016-06-16 | General Electric Company | Method and system for control of emissions in exhaust aftertreatment system |
| JP2020026756A (en) * | 2018-08-10 | 2020-02-20 | 日本特殊陶業株式会社 | Engine control device and engine control method |
| CN112780427A (en) * | 2021-01-20 | 2021-05-11 | 潍柴动力股份有限公司 | Control method and device of engine system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114151217B (en) | 2023-12-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8196390B2 (en) | Procedure and device to monitor an exhaust gas after-treatment system | |
| JP3801135B2 (en) | Engine exhaust gas purification device | |
| US8234916B2 (en) | Abnormality diagnosis device for air-fuel ratio sensor | |
| US8209962B2 (en) | Diesel particulate filter soot permeability virtual sensors | |
| AU2011342304B2 (en) | DPF system | |
| US8844267B2 (en) | Method and system for controlling a nitrogen oxide (NOx) conversion efficiency monitor | |
| US7886521B2 (en) | Diagnosis device of exhaust purification catalyst | |
| WO2009101667A1 (en) | Exhaust gas collecting performance judging method and device therefor | |
| JP2009293518A (en) | Exhaust emission control device for internal combustion engine | |
| US9739215B2 (en) | Intrusive EGR monitor for a hybrid vehicle | |
| CN100353045C (en) | Waste gas purifying apparatus and method for internal combustion engine | |
| KR101416408B1 (en) | Method and system of determining failure of urea quality sensor | |
| US8806928B2 (en) | Catalyst deterioration detection apparatus and catalyst deterioration detection method for internal combustion engine | |
| JP2009191694A (en) | Exhaust emission control device of internal combustion engine | |
| US8033103B2 (en) | Exhaust purification device | |
| CN108547689B (en) | Vehicle control method and control device and vehicle | |
| JP3721922B2 (en) | Failure diagnosis device for fuel level sensor | |
| CN114151217B (en) | Vehicle DPF protection method and protection system | |
| JP5413248B2 (en) | Exhaust gas purification system for internal combustion engine | |
| CN114738097B (en) | DPF trapping efficiency monitoring method and device and vehicle | |
| CN113700544B (en) | Method and device for judging cheating of nitrogen-oxygen sensor | |
| US11066975B2 (en) | Method and device for diagnosis of a particle filter arranged in the exhaust gas system of a petrol-operated internal combustion engine | |
| CN113514169A (en) | Credibility fault diagnosis method for downstream temperature sensor of SCR (Selective catalytic reduction) system | |
| FR2948979A1 (en) | Nitrogen oxide sensor diagnosing and controlling method for e.g. diesel engine of motor vehicle, involves calibrating zero value of nitrogen oxide sensor during phase in which engine functions along rich combustion mode | |
| KR101755485B1 (en) | Exhaust gas post treatment device in diesel engine and control method using the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |