CN109306892B - Method and device for calculating soot value of diesel engine - Google Patents
Method and device for calculating soot value of diesel engine Download PDFInfo
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- CN109306892B CN109306892B CN201811091904.4A CN201811091904A CN109306892B CN 109306892 B CN109306892 B CN 109306892B CN 201811091904 A CN201811091904 A CN 201811091904A CN 109306892 B CN109306892 B CN 109306892B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/05—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a particulate sensor
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Abstract
The invention relates to the technical field of diesel engine post-processing, and particularly discloses a method for calculating a soot value of a diesel engine, wherein the method comprises the following steps: judging the working state of the diesel engine according to the water temperature of the diesel engine, wherein the working state of the diesel engine comprises a normal temperature state and a low temperature state; collecting soot parameters of a diesel engine, and establishing a soot calculation model of the diesel engine by calibrating the soot parameters; if the working state of the diesel engine is the normal temperature state, calculating the mass flow of the soot of the diesel engine under the normal temperature state according to a soot calculation model of the diesel engine; and if the working state of the diesel engine is a low-temperature state, calculating the mass flow of the soot of the diesel engine under the low-temperature state according to a soot calculation model of the diesel engine. The invention also discloses a device for calculating the soot value of the diesel engine. The method for calculating the soot value of the diesel engine has the advantage of accurately estimating the soot emission value of the diesel engine.
Description
Technical Field
The invention relates to the technical field of diesel engine post-processing, in particular to a method and a device for calculating a diesel engine soot value.
Background
Diesel engines are widely used internal combustion power at present, and have been applied to various aspects such as automobile, non-road machinery, marine power and the like. In recent years, the emission pollution of diesel engines has been receiving more and more attention. At present, the state has come out of emission regulations about diesel engines, and the emission of the diesel engines is required to be gradually reduced to a controllable range. In order to meet the requirements of the diesel engine on emission regulations, the exhaust gas of the diesel engine needs to be subjected to aftertreatment, and NOx and soot in the tail gas of the diesel engine are removed, so that the aim of reducing the emission of the diesel engine is fulfilled.
According to the related studies, the main components of PM emitted from diesel engines are carbon particles, sulfates, soluble organic components, ash containing metallic elements, and the like. In which the formation of carbon particles is an unbalanced process, it is now theorized that the process of carbon particle formation is a process of mass decomposition of fuel molecules and rearrangement of atomic molecules. When fuel oil is injected into high-temperature air, light hydrocarbon is evaporated and gasified quickly, heavy hydrocarbon meetings exist too temporarily, liquid hydrocarbon is directly dehydrogenated and carbonized under high-temperature and anoxic conditions to form coke-like liquid-phase precipitation type carbon particles, and the coarseness of the carbon particles is generally large. While the gasified light hydrocarbon passes through different paths to generate gas phase precipitation type carbon granules with relatively small particle size. The fuel molecules in gas phase are partially oxidized and thermally cracked under the condition of high temperature and oxygen deficiency, and are continuously dehydrogenated to form atomic carbon ions which are gradually polymerized into soot cores (carbon cores) with the diameter of 2 nm; the condensation of other substances of the hydrocarbon core in the gas phase on the surface of the carbon core and the condensation of the carbon core caused by mutual collision enable the carbon core to continue to increase and become a carbon source element with the diameter of 20-30 nm; and the carbon source units are mutually aggregated to form spherical or chain-shaped porous polymers with the diameter of less than 1 micron.
In order to obtain the soot value of the diesel engine, the detection is mainly performed by relevant instruments such as AVL415, AVL483 and the like at present. But because the instrument detection is greatly influenced by the environment, the detection result is inaccurate.
Therefore, how to provide a method capable of accurately estimating the soot emission value of the diesel engine becomes a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
The invention aims to at least solve one of the technical problems in the prior art, and provides a method and a device for calculating the soot value of a diesel engine, so as to solve the problems in the prior art.
As a first aspect of the present invention, there is provided a method of calculating a soot value of a diesel engine, wherein the method of calculating a soot value of a diesel engine includes:
judging the working state of the diesel engine according to the water temperature of the diesel engine, wherein the working state of the diesel engine comprises a normal temperature state and a low temperature state;
collecting soot parameters of a diesel engine, and establishing a soot calculation model of the diesel engine by calibrating the soot parameters;
if the working state of the diesel engine is the normal-temperature state, calculating the mass flow of the soot of the diesel engine under the normal-temperature state according to a soot calculation model of the diesel engine, wherein a correction coefficient in the soot calculation model of the diesel engine is a first correction coefficient under the normal-temperature state;
and if the working state of the diesel engine is a low-temperature state, calculating the mass flow of the soot of the diesel engine under the low-temperature state according to a soot calculation model of the diesel engine, wherein the correction coefficient in the soot calculation model of the diesel engine is a second correction coefficient under the low-temperature state.
Preferably, the judging the operating state of the diesel engine according to the water temperature of the diesel engine comprises:
comparing the water temperature of the diesel engine with a preset water temperature value;
if the water temperature value of the diesel engine is greater than or equal to the preset water temperature value, judging that the working state of the diesel engine is a normal temperature state;
and if the water temperature value of the diesel engine is smaller than the preset water temperature value, judging that the working state of the diesel engine is a low-temperature state.
Preferably, the soot parameters of the diesel engine include: the engine comprises a rotating speed, an oil injection quantity, an air inlet mass flow, an air inlet pressure, a cooling water temperature and an EGR quantity.
Preferably, the soot calculation model is:
msoot＝ef，
wherein m issootAnd f represents an exponential equation coefficient, and the exponential equation coefficient is obtained by calculation according to the soot parameter of the diesel engine and the first correction coefficient or the second correction coefficient.
Preferably, the calculation formula of the exponential equation coefficients is:
wherein n represents the rotation speed, q represents the fuel injection quantity, and minRepresenting mass flow of intake air, pinRepresenting the inlet pressure, tcDenotes cooling water temperature, mEGRRepresents the amount of EGR, CnRepresenting standard value of rotation speed, CqThe standard value of the fuel injection quantity is represented,
indicates the intake air amount criterion value,
a standard value of the temperature of the cooling water is shown,
a standard value of the intake air pressure is represented,
expressing EGR amount standard value, KnN is 1,2, … 13, and K is a correction coefficient when the diesel engine is in the normal temperature statenRepresents a first correction coefficient, K is set when the working state of the diesel engine is a low temperature statenRepresents a second correction coefficient, the first correction coefficient being different from the second correction coefficient.
As a second aspect of the present invention, there is provided an apparatus for calculating a soot value of a diesel engine, wherein the apparatus for calculating a soot value of a diesel engine includes:
the state judgment module is used for judging the working state of the diesel engine according to the water temperature of the diesel engine, wherein the working state of the diesel engine comprises a normal temperature state and a low temperature state;
the model establishing module is used for acquiring soot parameters of the diesel engine and establishing a soot calculation model of the diesel engine by calibrating the soot parameters;
the normal-temperature-state soot calculation module is used for calculating the mass flow of the soot of the diesel engine under the normal temperature state according to the soot calculation model of the diesel engine if the working state of the diesel engine is the normal temperature state, wherein the correction coefficient in the soot calculation model of the diesel engine is a first correction coefficient under the normal temperature state;
and the low-temperature state soot calculation module is used for calculating the mass flow of the soot of the diesel engine under the low-temperature state according to the soot calculation model of the diesel engine if the working state of the diesel engine is the low-temperature state, wherein the correction coefficient in the soot calculation model of the diesel engine is a second correction coefficient under the low-temperature state.
Preferably, the state judging module includes:
the comparison unit is used for comparing the water temperature of the diesel engine with a preset water temperature value;
the first judgment unit is used for judging that the working state of the diesel engine is a normal temperature state if the water temperature value of the diesel engine is greater than or equal to the preset water temperature value;
and the second judging unit is used for judging that the working state of the diesel engine is a low-temperature state if the water temperature value of the diesel engine is smaller than the preset water temperature value.
According to the method for calculating the soot value of the diesel engine, the working state of the diesel engine is judged according to the water temperature state of the diesel engine, and the soot value in the current state is calculated according to different working states of the diesel engine and the established soot calculation model, so that the soot mass flow of the diesel engine is obtained.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a flow chart of a method for calculating soot value of a diesel engine provided by the invention.
FIG. 2 is a model diagram of the calculation of soot value of a diesel engine provided by the present invention.
FIG. 3 is a model diagram of a soot calculation module provided by the present invention.
Fig. 4 is a block diagram of a device for calculating soot value of a diesel engine according to the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
As a first aspect of the present invention, there is provided a method of calculating a soot value of a diesel engine, wherein the method of calculating a soot value of a diesel engine, as shown in fig. 1 and 2, includes:
s110, judging the working state of the diesel engine according to the water temperature of the diesel engine, wherein the working state of the diesel engine comprises a normal temperature state and a low temperature state;
s120, collecting soot parameters of the diesel engine, and establishing a soot calculation model of the diesel engine by calibrating the soot parameters;
s130, if the working state of the diesel engine is a normal-temperature state, calculating the mass flow of the soot of the diesel engine under the normal-temperature state according to a soot calculation model of the diesel engine, wherein a correction coefficient in the soot calculation model of the diesel engine is a first correction coefficient under the normal-temperature state;
and S140, if the working state of the diesel engine is a low-temperature state, calculating the mass flow of the soot of the diesel engine under the low-temperature state according to a soot calculation model of the diesel engine, wherein the correction coefficient in the soot calculation model of the diesel engine is a second correction coefficient under the low-temperature state.
According to the method for calculating the soot value of the diesel engine, the working state of the diesel engine is judged according to the water temperature state of the diesel engine, and the soot value in the current state is calculated according to different working states of the diesel engine and the established soot calculation model, so that the soot mass flow of the diesel engine is obtained.
Specifically, the judging the working state of the diesel engine according to the water temperature of the diesel engine comprises the following steps:
comparing the water temperature of the diesel engine with a preset water temperature value;
if the water temperature value of the diesel engine is greater than or equal to the preset water temperature value, judging that the working state of the diesel engine is a normal temperature state;
and if the water temperature value of the diesel engine is smaller than the preset water temperature value, judging that the working state of the diesel engine is a low-temperature state.
Specifically, the soot parameters of the diesel engine include: the engine comprises a rotating speed, an oil injection quantity, an air inlet mass flow, an air inlet pressure, a cooling water temperature and an EGR quantity.
Specifically, the soot calculation formula is as follows:
msoot＝ef，
wherein m issootAnd f represents an exponential equation coefficient, and the exponential equation coefficient is obtained by calculation according to the soot parameter of the diesel engine and the first correction coefficient or the second correction coefficient.
More specifically, as shown in fig. 3, the calculation formula of the exponential equation coefficients is:
wherein n represents the rotation speed, q represents the fuel injection quantity, and minRepresenting mass flow of intake air, pinRepresenting the inlet pressure, tcDenotes cooling water temperature, mEGRRepresents the amount of EGR, CnRepresenting standard value of rotation speed, CqThe standard value of the fuel injection quantity is represented,
indicates the intake air amount criterion value,
a standard value of the temperature of the cooling water is shown,
a standard value of the intake air pressure is represented,
expressing EGR amount standard value, KnN is 1,2, … 13, and K is a correction coefficient when the diesel engine is in the normal temperature statenRepresents a first correction coefficient, K is set when the working state of the diesel engine is a low temperature statenRepresents a second correction coefficient, the first correction coefficient being different from the second correction coefficient.
U in FIG. 32The square of the difference between the collected soot parameter and the standard value of the soot parameter is shown.
The operation of the method for calculating the soot value of the diesel engine according to the present invention will be described in detail with reference to fig. 1 to 3.
According to the combustion process of the diesel engine and various influence factors influencing the combustion process, through a large amount of experimental data, the soot emission value of the diesel engine is found to be related to the following factors: rotation speed, fuel injection quantity, intake mass flow, intake pressure, cooling water temperature, EGR quantity and the like. The soot emission of the diesel engine is also greatly different between a low-temperature state and a normal-temperature state, so that the soot value of the diesel engine is calculated respectively in the low-temperature state and the normal state.
As can be seen from the calculation logic of the soot emission value of the diesel engine in FIG. 2, firstly, the soot calculation mode of the diesel engine is judged according to the water temperature of the diesel engine. The method comprises a low-temperature soot calculation mode and a normal-temperature soot calculation mode. When the water temperature of the diesel engine is lower than a set water temperature value, calculating the soot value of the diesel engine in a low-temperature soot calculation mode; and when the water temperature of the diesel engine is higher than or equal to the set water temperature value, calculating the soot value of the diesel engine in a normal soot calculation mode. The calculation method of the low-temperature soot calculation mode is the same as that of the normal soot calculation mode, and the correction coefficients are different, as shown in fig. 3.
The method for calculating the soot value of the diesel engine provided by the invention is verified by the bench, and after calibrating each correction factor, the error of the calculated soot value can be controlled within +/-10% compared with the soot value measured by the bench instrument.
As a second aspect of the present invention, there is provided an apparatus for calculating a soot value of a diesel engine, wherein, as shown in fig. 4, the apparatus 100 for calculating a soot value of a diesel engine includes:
the state judging module 110, the state judging module 110 is configured to judge a working state of the diesel engine according to a water temperature of the diesel engine, where the working state of the diesel engine includes a normal temperature state and a low temperature state;
the model establishing module 120 is used for acquiring soot parameters of the diesel engine, and establishing a soot calculation model of the diesel engine by calibrating the soot parameters;
the normal-temperature soot calculation module 130 is configured to calculate a mass flow rate of soot of the diesel engine at the normal temperature according to a soot calculation model of the diesel engine if the operating state of the diesel engine is the normal temperature state, where a correction coefficient in the soot calculation model of the diesel engine is a first correction coefficient at the normal temperature state;
and the low-temperature state soot calculation module 140, wherein the low-temperature state soot calculation module 140 is configured to calculate a mass flow rate of soot of the diesel engine in a low-temperature state according to a diesel engine soot calculation model if the operating state of the diesel engine is the low-temperature state, and a correction coefficient in the diesel engine soot calculation model is a second correction coefficient in the low-temperature state.
According to the device for calculating the soot value of the diesel engine, the working state of the diesel engine is judged according to the water temperature state of the diesel engine, and the soot value under the current state is calculated according to different working states of the diesel engine and the established soot calculation model, so that the soot mass flow of the diesel engine is obtained.
Specifically, the state determination module includes:
the comparison unit is used for comparing the water temperature of the diesel engine with a preset water temperature value;
the first judgment unit is used for judging that the working state of the diesel engine is a normal temperature state if the water temperature value of the diesel engine is greater than or equal to the preset water temperature value;
and the second judging unit is used for judging that the working state of the diesel engine is a low-temperature state if the water temperature value of the diesel engine is smaller than the preset water temperature value.
The operation of the device for calculating the soot value of the diesel engine according to the present invention can refer to the foregoing description of the method for calculating the soot value of the diesel engine, and will not be described herein again.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (7)
1. A method for calculating a soot value of a diesel engine is characterized by comprising the following steps:
judging the working state of the diesel engine according to the water temperature of the diesel engine, wherein the working state of the diesel engine comprises a normal temperature state and a low temperature state;
collecting soot parameters of a diesel engine, and establishing a soot calculation model of the diesel engine by calibrating the soot parameters;
if the working state of the diesel engine is the normal-temperature state, calculating the mass flow of the soot of the diesel engine under the normal-temperature state according to a soot calculation model of the diesel engine, wherein a correction coefficient in the soot calculation model of the diesel engine is a first correction coefficient under the normal-temperature state;
and if the working state of the diesel engine is a low-temperature state, calculating the mass flow of the soot of the diesel engine under the low-temperature state according to a soot calculation model of the diesel engine, wherein the correction coefficient in the soot calculation model of the diesel engine is a second correction coefficient under the low-temperature state.
2. The method for calculating a soot value of a diesel engine according to claim 1, wherein the judging the operating state of the diesel engine according to the water temperature of the diesel engine comprises:
comparing the water temperature of the diesel engine with a preset water temperature value;
if the water temperature value of the diesel engine is greater than or equal to the preset water temperature value, judging that the working state of the diesel engine is a normal temperature state;
and if the water temperature value of the diesel engine is smaller than the preset water temperature value, judging that the working state of the diesel engine is a low-temperature state.
3. The method of calculating a soot value of a diesel engine according to claim 1, wherein the soot parameter of the diesel engine includes: the engine comprises a rotating speed, an oil injection quantity, an air inlet mass flow, an air inlet pressure, a cooling water temperature and an EGR quantity.
4. The method of calculating a soot value of a diesel engine according to claim 3, wherein the soot calculation model is:
msoot＝ef，
wherein m issootAnd f represents an exponential equation coefficient, and the exponential equation coefficient is obtained by calculation according to the soot parameter of the diesel engine and the first correction coefficient or the second correction coefficient.
5. The method for calculating the soot value of the diesel engine according to claim 4, wherein the calculation formula of the exponential equation coefficients is as follows:
wherein n represents the rotation speed, q represents the fuel injection quantity, and minRepresenting mass flow of intake air, pinRepresenting the inlet pressure, tcDenotes cooling water temperature, mEGRRepresents the amount of EGR, CnRepresenting standard value of rotation speed, CqThe standard value of the fuel injection quantity is represented,
indicates the intake air amount criterion value,
a standard value of the temperature of the cooling water is shown,
a standard value of the intake air pressure is represented,
expressing EGR amount standard value, KnN is 1,2, … 13, and K is a correction coefficient when the diesel engine is in the normal temperature statenRepresents a first correction coefficient, K is set when the working state of the diesel engine is a low temperature statenRepresents a second correction coefficient, the first correction coefficient being different from the second correction coefficient.
6. An apparatus for calculating a soot value of a diesel engine, comprising:
the state judgment module is used for judging the working state of the diesel engine according to the water temperature of the diesel engine, wherein the working state of the diesel engine comprises a normal temperature state and a low temperature state;
the model establishing module is used for acquiring soot parameters of the diesel engine and establishing a soot calculation model of the diesel engine by calibrating the soot parameters;
the normal-temperature-state soot calculation module is used for calculating the mass flow of the soot of the diesel engine under the normal temperature state according to the soot calculation model of the diesel engine if the working state of the diesel engine is the normal temperature state, wherein the correction coefficient in the soot calculation model of the diesel engine is a first correction coefficient under the normal temperature state;
and the low-temperature state soot calculation module is used for calculating the mass flow of the soot of the diesel engine under the low-temperature state according to the soot calculation model of the diesel engine if the working state of the diesel engine is the low-temperature state, wherein the correction coefficient in the soot calculation model of the diesel engine is a second correction coefficient under the low-temperature state.
7. The apparatus for calculating a soot value of a diesel engine according to claim 6, wherein the state judging module comprises:
the comparison unit is used for comparing the water temperature of the diesel engine with a preset water temperature value;
the first judgment unit is used for judging that the working state of the diesel engine is a normal temperature state if the water temperature value of the diesel engine is greater than or equal to the preset water temperature value;
and the second judging unit is used for judging that the working state of the diesel engine is a low-temperature state if the water temperature value of the diesel engine is smaller than the preset water temperature value.
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| CN102159804A (en) * | 2008-05-16 | 2011-08-17 | 丰田自动车株式会社 | Soot discharge estimating device for internal combustion engines |
| CN102803669A (en) * | 2009-06-03 | 2012-11-28 | 丰田自动车株式会社 | Device for estimating amount of soot discharged from internal combustion engine |
| CN105332808A (en) * | 2014-08-04 | 2016-02-17 | 通用汽车环球科技运作有限责任公司 | Engine output soot diagnostic control system based on transient drive cycle detection |
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| US10273858B2 (en) * | 2015-12-02 | 2019-04-30 | Cummins Emission Solutions Inc. | Soot load estimation during idle or low load |
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|---|---|---|---|---|
| CN102159804A (en) * | 2008-05-16 | 2011-08-17 | 丰田自动车株式会社 | Soot discharge estimating device for internal combustion engines |
| CN102803669A (en) * | 2009-06-03 | 2012-11-28 | 丰田自动车株式会社 | Device for estimating amount of soot discharged from internal combustion engine |
| CN105332808A (en) * | 2014-08-04 | 2016-02-17 | 通用汽车环球科技运作有限责任公司 | Engine output soot diagnostic control system based on transient drive cycle detection |
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