CN114635775A - DOC performance detection method and system for diesel engine - Google Patents
DOC performance detection method and system for diesel engine Download PDFInfo
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- CN114635775A CN114635775A CN202210187961.2A CN202210187961A CN114635775A CN 114635775 A CN114635775 A CN 114635775A CN 202210187961 A CN202210187961 A CN 202210187961A CN 114635775 A CN114635775 A CN 114635775A
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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
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
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Abstract
The invention discloses a DOC performance detection method of a diesel engine, which comprises the following steps: if the first type of working parameters of the current engine meet a first specified working condition, starting to detect the DOC upstream temperature and the DOC downstream temperature; if the current second type of working parameters meet a second specified working condition and the DOC conversion HC mass flow meets the DOC detection condition, starting HC conversion rate detection; if the HC conversion rate obtained by detection is larger than the specified minimum threshold value, judging that the DOC has a fault, and if the HC conversion rate is smaller than the specified minimum threshold value, judging that the DOC is normal in function. The invention also discloses a DOC performance detection system of the diesel engine. The invention can ensure normal DOC operation of the diesel engine, and can effectively judge the DOC performance by calculating the HC conversion rate. Compared with the prior art, the method has the advantages that DOC removal, pressurization and other diagnosis methods are adopted, and the operation is simple. Moreover, equipment does not need to be added or DOC does not need to be removed, the equipment and labor cost can be reduced, and the high detection efficiency is improved.
Description
Technical Field
The invention relates to the field of energy conservation and environmental protection, in particular to a diesel engine DOC performance detection method and a diesel engine DOC performance detection system
Background
The diesel engine has the advantages of high thermal efficiency, excellent power performance and the like, and is widely applied to the fields of heavy commercial vehicles and non-roads such as agricultural machinery, engineering machinery and the like. But the pollutants discharged by the tail gas of the diesel engine also have great negative effects on the ecological environment. Diesel exhaust pollutants include Hydrocarbons (HC), nitrogen oxides (NOx), carbon monoxide (CO), solid Particulate Matter (PM), and the like; among them, NOx and PM are the main pollutants. Aiming at the six emission regulations in the current country, the current aftertreatment technical route mainly comprises two types of DOC + DPF + high-efficiency SCR and EGR + DOC + DPF + SCR. In long-term operation of a DPF, increasing particulate matter in the trap causes an increase in engine backpressure, resulting in a decrease in engine performance, so that the deposited particulate matter is periodically removed to restore the filtering performance of the DPF. DPF regeneration can be divided into active regeneration and passive regeneration modes.
Diesel oxidation catalysts reduce particulate emissions primarily by removing dissolved organic components (SOF) from solid particulates while burning off a small portion of Dry Soot (DS), reducing the amount of CO and HC emissions. The mainstream passive regeneration mode at present is a DOC + DPF technical scheme. The precondition for realizing the DPF regeneration function is to ensure that the DOC functions normally. Therefore, a reasonable and cost effective method for detecting DOC performance is sought. The DOC front end can generate a large amount of HC only when the engine exhaust temperature is low and the carbon load is accumulated to a regeneration threshold value, and DPF regeneration is realized by means of DOC oxidation heat release to increase the exhaust temperature.
Generally, a method for detecting the running state of the DOC is to determine the performance of the DOC by pressurizing and measuring the gas concentrations of front and rear ports of the DOC by using a sensor so as to calculate the conversion efficiency of the gas, but the method for measuring the gas conversion efficiency by using the pressurizing sensor has higher cost; some researchers also propose to compare the contents of the components of the exhaust gas before and after removing the DOC by using a gas analyzer in a DOC removing mode, and compare the contents with a model value to obtain the actual state of the DOC, but the operation is more complicated.
Related terms
EGR (exhaust Gas recirculation) -exhaust Gas recirculation
DOC (diesel Oxidation catalyst) -Oxidation catalyst
DPF (Diesel particulate Filter) -particulate trap
SCR (selective catalytic reduction) -selective catalytic reducer.
Disclosure of Invention
In this summary, a series of simplified form concepts are introduced that are simplifications of the prior art in this field, which will be described in further detail in the detailed description. This summary of the invention is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
The invention aims to provide a diesel engine DOC performance detection method which can reduce detection cost and improve detection efficiency compared with the prior art. And a diesel engine DOC performance detection system.
Another technical problem to be solved by the invention is to provide
In order to solve the technical problem, the invention provides a diesel engine DOC performance detection method, which is characterized by comprising the following steps:
s1, if the first type of working parameters of the current engine meet a first specified working condition, starting to detect the DOC upstream temperature and the DOC downstream temperature;
s2, if the current second type working parameters meet a second specified working condition and the DOC conversion HC mass flow meets DOC detection conditions, starting HC conversion rate detection;
and S3, if the detected HC conversion rate is larger than the specified minimum threshold value, judging that the DOC has a fault, and if the detected HC conversion rate is smaller than the specified minimum threshold value, judging that the DOC is normal in function.
Optionally, the DOC performance detection method of the diesel engine is further improved, and the first type of operating parameters are actual rotating speed, engine load and engine running state.
Optionally, the method for detecting DOC performance of diesel engine is further improved, and the second type of operating parameters are actual engine speed, engine operating state, DOC upstream temperature and DOC downstream temperature.
Optionally, when the diesel engine DOC performance detection method is further improved to implement step S2, the DOC conversion HC mass flow is integrated to determine whether the DOC detection condition is met.
Optionally, when the diesel engine DOC performance detection method is further improved to implement step S3, the HC conversion rate is calculated by using the following formula;
the models related to the formula are all designated reference models, the reference model values are all selected from corresponding temperature fields or mass flow fields, and the reference models comprise: DOC upstream temperature model, DOC downstream reference temperature model, the exhaust gas mass flow model is DOC conversion HC mass flow model, the heat capacity model of exhaust gas is HC heat capacity model, the model value includes: the mass flow of the exhaust gas is the mass flow of the converted HC of the DOC, and the heat capacity of the exhaust gas is the heat capacity of the HC.
In order to solve the above technical problem, the present invention provides a DOC performance detection system of a diesel engine, comprising:
sensors for measuring actual temperature values upstream and downstream of the DOC;
the release condition detection module determines whether to start detecting the DOC upstream temperature and the DOC downstream temperature according to whether the current first class working parameters of the engine meet a first specified working condition;
determining whether to release a specified model value in the model module according to whether the current second type working parameters meet a second specified working condition;
the HC conversion rate detection module determines whether to start HC conversion rate detection or not according to the specified model value sent by the release condition detection module and the mass flow of HC converted by the DOC;
if the HC conversion rate obtained by detection is larger than the specified minimum threshold value, judging that the DOC has a fault, and if the HC conversion rate is smaller than the specified minimum threshold value, judging that the DOC is normal in function.
Optionally, the DOC performance detection system of the diesel engine is further improved, and the first type of operating parameters are actual rotating speed, engine load and engine running state.
Optionally, the DOC performance detection system of the diesel engine is further improved, and the second type of operating parameters are actual engine speed, engine operating state, DOC upstream temperature and DOC downstream temperature.
Optionally, the diesel engine DOC performance detection system is further improved, and the HC conversion rate detection module performs integral judgment on whether DOC detection conditions are met or not by converting HC mass flow through DOC.
Optionally, the DOC performance detection system of the diesel engine is further improved, and the HC conversion rate detection module calculates the HC conversion rate by adopting the following formula;
the models related to the formula are all designated reference models, the reference model values are all selected from corresponding temperature fields or mass flow fields, and the reference models comprise: DOC upstream temperature model, DOC downstream reference temperature model, the exhaust gas mass flow model is DOC conversion HC mass flow model, the heat capacity model of exhaust gas is HC heat capacity model, the model value includes: the mass flow of the exhaust gas is the mass flow of the converted HC of the DOC, and the heat capacity of the exhaust gas is the heat capacity of the HC.
The main design idea of the invention is to detect the performance of the diesel oxidation catalyst based on the HC conversion rate. Insufficient combustion of in-cylinder fuel during diesel post-injection produces a large amount of HC, the presence of which can rapidly raise the temperature of the exhaust entering the DOC. The invention adopts sensors to detect the temperatures of the DOC upstream and downstream under the conditions of specifying the actual rotating speed, the engine load and the engine running state (which can be calibrated or specified empirically), and starts to calculate the detection of the HC conversion rate when the actual rotating speed, the engine state, the upstream and downstream measured temperatures are compared with the selected model value to meet the release condition. At the same time, in order to ensure that the HC mass flow converted in the last exothermic reaction in the oxidation catalyst is sufficient for the evaluation of the oxidation catalyst, the HC mass flow is integrated (a value greater than the specified HC mass flow is considered to satisfy the condition); calculating an HC conversion rate value using conditions of exhaust gas mass flow, measured temperature, heat capacity of the exhaust gas, and the like before HC conversion rate evaluation is performed; and finally, evaluating the HC conversion rate, if the HC conversion rate is greater than a set minimum threshold value, judging that the DOC has a fault, and if the HC conversion rate is less than the set minimum threshold value, judging that the DOC is normal in function. The invention can ensure normal DOC operation of the diesel engine, and can effectively judge the DOC performance by calculating the HC conversion rate. Compared with the prior art, the method has the advantages that DOC removal, pressurization and other diagnosis methods are adopted, and the operation is simple. Moreover, equipment does not need to be added or DOC does not need to be removed, the equipment and labor cost can be reduced, and the high detection efficiency is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this specification. The drawings are not necessarily to scale, however, and may not be intended to accurately reflect the precise structural or performance characteristics of any given embodiment, and should not be construed as limiting or restricting the scope of values or properties encompassed by exemplary embodiments in accordance with the invention. The invention will be described in further detail with reference to the following detailed description and accompanying drawings:
fig. 1 is a schematic diagram of the principle of the present invention.
FIG. 2 is a schematic diagram of a HC conversion calculation scheme according to the present invention.
Description of the reference numerals
Detailed Description
Other advantages and technical effects of the present invention will be fully apparent to those skilled in the art from the disclosure of the present specification, wherein the following description is given by way of specific embodiments. The invention is capable of other embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the general spirit of the invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. The following exemplary embodiments of the present invention may be embodied in many different forms and should not be construed as limited to the specific embodiments set forth herein. It is understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of these exemplary embodiments to those skilled in the art.
A first embodiment;
the invention provides a DOC performance detection method of a diesel engine, which comprises the following steps:
s1, if the first type of working parameters of the current engine meet a first specified working condition, starting to detect the DOC upstream temperature and the DOC downstream temperature;
s2, if the current second type working parameters meet a second specified working condition and the DOC conversion HC mass flow meets the DOC detection condition, starting HC conversion rate detection;
and S3, if the detected HC conversion rate is larger than the specified minimum threshold value, judging that the DOC has a fault, and if the detected HC conversion rate is smaller than the specified minimum threshold value, judging that the DOC is normal in function.
Further, it will be understood that, although the terms first, second, etc. may be used herein to describe various elements, parameters, components, regions, layers and/or sections, these elements, parameters, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, parameter, component, region, layer or section from another element, parameter, component, region, layer or section. Thus, a first element, parameter, component, region, layer or section discussed below could be termed a second element, parameter, component, region, layer or section without departing from the teachings of exemplary embodiments according to the present invention.
A second embodiment;
referring to fig. 1, the invention provides a diesel engine DOC performance detection method, which includes the following steps:
s1, if the actual rotating speed, the engine load and the engine running state of the current engine meet a first specified working condition, starting to detect the DOC upstream temperature and the DOC downstream temperature;
s2, if the current actual engine speed, the engine running state, the DOC upstream temperature and the DOC downstream temperature meet a second specified working condition, and the DOC conversion HC mass flow is subjected to integral judgment and is larger than a specified threshold value, and the DOC conversion rate detection is started if the DOC conversion HC mass flow is judged to meet the DOC detection condition;
s3, if the HC conversion rate obtained by detection is larger than a specified minimum threshold value, judging that the DOC has a fault, and if the HC conversion rate is smaller than the specified minimum threshold value, judging that the DOC is normal in function;
wherein the HC conversion is calculated using the following formula, as shown with reference to fig. 2;
the models related to the formula are all designated reference models, the reference model values are all selected from corresponding temperature fields or mass flow fields, and the reference models comprise: DOC upstream temperature model, DOC downstream reference temperature model, the exhaust gas mass flow model is DOC conversion HC mass flow model, the heat capacity model of exhaust gas is HC heat capacity model, the model value includes: the DOC upstream model temperature, the DOC downstream model reference temperature, the exhaust gas mass flow, namely the DOC conversion HC mass flow, and the heat capacity of the exhaust gas, namely the HC heat capacity.
A third embodiment;
the invention provides a DOC performance detection system of a diesel engine, which comprises:
sensors for measuring actual temperature values upstream and downstream of the DOC;
the release condition detection module determines whether to start detecting the DOC upstream temperature and the DOC downstream temperature according to whether the first class of working parameters of the current engine meet a first specified working condition;
determining whether to release a specified model value in the model module according to whether the current second type working parameters meet a second specified working condition;
the HC conversion rate detection module determines whether to start HC conversion rate detection or not according to the specified model value sent by the release condition detection module and the mass flow of HC converted by the DOC;
if the HC conversion rate obtained by detection is larger than the specified minimum threshold value, judging that the DOC has a fault, and if the HC conversion rate is smaller than the specified minimum threshold value, judging that the DOC is normal in function.
Wherein the release condition detection module and the HC conversion rate detection module may be integrated in an ECU of the engine control system; correspondingly, an independent controller can be selected to realize the functions of the modules.
A fourth embodiment;
the invention provides a diesel engine DOC performance detection system, comprising:
sensors for measuring actual temperature values upstream and downstream of the DOC;
the release condition detection module determines whether to start detecting the DOC upstream temperature and the DOC downstream temperature according to whether the current actual rotating speed, the starting load and the engine running state meet a first specified working condition; the actual rotating speed, the engine load and each working parameter of the running state of the engine can be obtained through calibration or empirical values and are designated values;
determining whether a model value in a model module is released or not according to whether the current actual engine speed, the engine running state, the DOC upstream temperature and the DOC downstream temperature meet a second specified working condition or not;
the actual engine speed, the engine running state, the DOC upstream temperature and the DOC downstream temperature can be obtained through calibration or empirical values and are designated values;
the HC conversion rate detection module judges whether to start HC conversion rate detection or not according to the designated model value sent by the release condition detection module and the mass flow integral of HC converted by the DOC;
if the HC conversion rate obtained by detection is larger than a specified minimum threshold value, judging that the DOC has a fault, and if the HC conversion rate is smaller than the specified minimum threshold value, judging that the DOC is normal in function; the HC conversion was calculated using the following formula;
the models related to the formula are all designated reference models, the reference model values are all selected from corresponding temperature fields or mass flow fields, and the reference models comprise: DOC upstream temperature model, DOC downstream reference temperature model, the exhaust gas mass flow model is DOC conversion HC mass flow model, the heat capacity model of exhaust gas is HC heat capacity model, the model value includes: the mass flow of the exhaust gas, namely the mass flow of HC converted by the DOC, and the heat capacity of the exhaust gas, namely the heat capacity of the HC;
wherein the release condition detection module and the HC conversion rate detection module may be integrated in an ECU of the engine control system; correspondingly, an independent controller can be selected to realize the functions of the modules.
Further, in the fourth embodiment, since the DOC is required to provide a sufficient light-off temperature during the DPF regeneration operation, the DOC performance must be detected before the DOC regeneration operation. Referring to fig. 1, before DOC performance detection is performed, the engine state needs to be kept stable, and the rotation speed needs to be adjusted to a certain range value to adapt to the DOC performance detection state. And measuring the DOC upstream and downstream actual temperature values through a sensor, feeding a rotating speed signal, an engine state signal and the like back to the ECU, and operating the release condition detection module. And comparing with the designated model value, and entering HC conversion rate calculation detection when all input signals meet the release condition. At the same time, the HC mass flow integral is judged to ensure that the HC mass flow converted in the last exothermic reaction in the oxidation catalyst is sufficient for evaluation of the oxidation catalyst. And integrating the signal of HC mass flow integral and the detection condition to judge whether the HC conversion rate can be calculated.
The DOC downstream outlet temperature is measured through a sensor, the exhaust gas mass flow is selected from an exhaust gas mass flow field, the exhaust gas model temperature and the model reference temperature are selected from an exhaust gas temperature field, the measured heat flow and the simulated heat flow are respectively calculated according to the calculation method shown in figure 2, and the calculated HC conversion rate is the ratio of the time integral of the measured heat flow to the time integral of the simulated heat flow. And calculating the releasing conditions such as the HC conversion amount reaching a threshold value, the average HC mass flow reaching a threshold value, the released heat reaching a threshold value and the like. When all the conditions for the detection state evaluation are satisfied, the HC conversion rate is calculated by depending on the HC mass flow integral value and the HC conversion rate, and is compared with a set HC conversion rate minimum threshold. Feeding the evaluation result back to a diagnosis system DSM, and when the calculated HC conversion rate is smaller than a set HC conversion rate threshold value, enabling the oxidation catalyst DOC to have no fault and be normal in performance; when the calculated HC conversion is greater than the set HC conversion threshold, the oxidation catalyst DOC has a fault.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The present invention has been described in detail with reference to the specific embodiments and examples, but these are not intended to limit the present invention. Many variations and modifications may be made by one of ordinary skill in the art without departing from the principles of the present invention, which should also be considered as within the scope of the present invention.
Claims (10)
1. A diesel engine DOC performance detection method is characterized by comprising the following steps:
s1, if the first type of working parameters of the current engine meet a first specified working condition, starting to detect the DOC upstream temperature and the DOC downstream temperature;
s2, if the current second type working parameters meet a second specified working condition and the DOC conversion HC mass flow meets the DOC detection condition, starting HC conversion rate detection;
and S3, if the detected HC conversion rate is larger than the specified minimum threshold value, judging that the DOC has a fault, and if the detected HC conversion rate is smaller than the specified minimum threshold value, judging that the DOC is normal in function.
2. The diesel engine DOC performance detection method according to claim 1, characterized in that: the first type of operating parameter is actual speed, engine load, and engine operating condition.
3. The diesel engine DOC performance detection method according to claim 1, characterized in that: the second type of operating parameter is the actual engine speed, the engine running state, the DOC upstream temperature and the DOC downstream temperature.
4. The diesel engine DOC performance detection method according to claim 1, characterized in that: when step S2 is executed, the DOC conversion HC mass flow rate is integrated to determine whether the DOC detection condition is satisfied.
5. The diesel engine DOC performance detection method according to claim 1, characterized in that: when step S3 is performed, the HC conversion rate is calculated using the following formula;
the models related to the formula are all designated reference models, the reference model values are all selected from corresponding temperature fields or mass flow fields, and the reference models comprise: DOC upstream temperature model, DOC downstream reference temperature model, the exhaust gas mass flow model is DOC conversion HC mass flow model, the heat capacity model of exhaust gas is HC heat capacity model, the model value includes: the mass flow of the exhaust gas is the mass flow of the converted HC of the DOC, and the heat capacity of the exhaust gas is the heat capacity of the HC.
6. A diesel engine DOC performance detection system, comprising:
sensors for measuring actual temperature values upstream and downstream of the DOC;
the release condition detection module determines whether to start detecting the DOC upstream temperature and the DOC downstream temperature according to whether the first class of working parameters of the current engine meet a first specified working condition;
determining whether to release a specified model value in the model module according to whether the current second type working parameters meet a second specified working condition;
the HC conversion rate detection module determines whether to start HC conversion rate detection according to the specified model value sent by the release condition detection module and the HC mass flow converted by DOC;
if the HC conversion rate obtained by detection is larger than the specified minimum threshold value, judging that the DOC has a fault, and if the HC conversion rate is smaller than the specified minimum threshold value, judging that the DOC is normal in function.
7. The diesel engine DOC performance detection system of claim 6, wherein: the first type of operating parameter is actual speed, engine load, and engine operating condition.
8. The diesel engine DOC performance detection system of claim 6, wherein: the second type of operating parameter is the actual engine speed, the engine running state, the DOC upstream temperature and the DOC downstream temperature.
9. The diesel engine DOC performance detection system of claim 6, wherein: and the HC conversion rate detection module carries out integral judgment on whether the DOC detection condition is met or not through the DOC conversion HC mass flow.
10. The diesel engine DOC performance detection system of claim 6, wherein: the HC conversion rate detection module calculates the HC conversion rate by adopting the following formula;
the models related to the formula are all designated reference models, the reference model values are all selected from corresponding temperature fields or mass flow fields, and the reference models comprise: DOC upstream temperature model, DOC downstream reference temperature model, the exhaust gas mass flow model is DOC conversion HC mass flow model, the heat capacity model of exhaust gas is HC heat capacity model, the model value includes: the mass flow of the exhaust gas is the mass flow of the converted HC of the DOC, and the heat capacity of the exhaust gas is the heat capacity of the HC.
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