CN111365147B - Method for judging flow of exhaust gas recirculation system - Google Patents
Method for judging flow of exhaust gas recirculation system Download PDFInfo
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- CN111365147B CN111365147B CN202010195141.9A CN202010195141A CN111365147B CN 111365147 B CN111365147 B CN 111365147B CN 202010195141 A CN202010195141 A CN 202010195141A CN 111365147 B CN111365147 B CN 111365147B
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000003745 diagnosis Methods 0.000 claims abstract description 39
- 230000001186 cumulative effect Effects 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 5
- 230000003111 delayed effect Effects 0.000 claims description 3
- 238000009825 accumulation Methods 0.000 claims description 2
- 238000007405 data analysis Methods 0.000 abstract description 3
- 238000013461 design Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000002405 diagnostic procedure Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/49—Detecting, diagnosing or indicating an abnormal function of the EGR system
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating, or supervising devices
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust-Gas Circulating Devices (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a flow judgment method of an exhaust gas recirculation system, which is based on an engine system with an exhaust gas recirculation configuration and comprises the following steps: s1, obtaining the misfire frequency according to the judgment logic of the misfire diagnosis, wherein the misfire frequency comprises the accumulated misfire frequency under the idle condition and the accumulated misfire frequency under the partial load condition which are respectively counted; and S2, judging the flow judgment results of the exhaust gas recirculation system under the idle condition and the partial load condition according to the set judgment limit value, and finishing the final flow diagnosis of the exhaust gas recirculation system by combining the judgment results under the two conditions. According to the invention, the accumulated data analysis is carried out on the fire phenomena of the engine under different working conditions, the specific condition of the flow of the exhaust gas recirculation system is accurately distinguished, the fault of overhigh flow of the exhaust gas recirculation is reported, and the indirect judgment on the flow of the exhaust gas recirculation system is realized.
Description
Technical Field
The invention relates to a method for judging the flow of an exhaust gas recirculation system, in particular to a method for judging the flow of a vehicle exhaust gas recirculation system through a fire phenomenon, and belongs to the technical field of vehicle control.
Background
Exhaust Gas Recirculation (EGR) refers to a process of returning part of Exhaust Gas discharged from an engine to an intake manifold and Re-entering a cylinder together with fresh air-fuel mixture. The common exhaust gas recirculation system can introduce the exhaust gas burnt in a cylinder into an air inlet path through a pipeline, and the flow of the exhaust gas recirculation system is controlled by using a solenoid valve with variable opening degree in the pipeline, so that the arrangement can be favorable for the emission and the economy of an engine to a certain extent.
In the light vehicle pollutant emission limit and measurement method (the sixth stage of china, GB 18352.6-2016), there are clear requirements for exhaust gas recirculation (ERG) system monitoring, selected as follows:
"J.4.8.1 for a vehicle equipped with an EGR system, the OBD system should monitor for faults such as too low flow and too high flow, and components (such as actuators, valves, sensors, etc.) in the EGR system should be monitored according to the monitoring requirements for the integrated components in J.4.14.
J.4.8.2 failure criteria:
j.4.8.2.1 the OBD system should detect a fault before the EGR flow exceeds or falls below the production enterprise specified flow, resulting in vehicle emissions exceeding the corresponding OBD threshold. "
However, the conventional exhaust gas recirculation system does not have a direct flow rate measurement device, and therefore, the flow rate of the exhaust gas recirculation system cannot be diagnosed and determined by a direct determination method, and can be determined only by an indirect method.
For the above reasons, the flow rate control of the conventional exhaust gas recirculation system is not accurate, and if the flow rate is too high, the engine may be misfired due to excessive exhaust gas mixed in the intake air. Particularly, under the conditions of higher rotating speed and larger load, the pressure in a cylinder is higher due to larger air inlet flow, and the introduction of exhaust gas recirculation is not easy to cause fire phenomenon; and under the idle working condition, the fire phenomenon is easy to occur when the flow rate of the exhaust gas recirculation is too high.
In view of the above, if a method for determining the flow rate of the exhaust gas recirculation system of the vehicle based on the misfire phenomenon can be designed, and a fault that the exhaust gas recirculation flow rate is too high can be accurately reported to meet the requirements of the relevant regulations, the problem to be solved by the technical staff in the field is urgent.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention provides a method for determining the flow rate of an exhaust gas recirculation system of a vehicle through a misfire phenomenon, as follows.
A method for judging the flow of an exhaust gas recirculation system based on an engine system with an exhaust gas recirculation configuration comprises the following steps:
s1, acquiring the misfire frequency count, and obtaining the misfire frequency according to the judgment logic of misfire diagnosis, wherein the misfire frequency comprises respectively counted accumulated misfire frequency under an idle working condition and accumulated misfire frequency under a partial load working condition;
and S2, diagnosing the flow of the exhaust gas recirculation system, judging the flow judgment result of the exhaust gas recirculation system under the idle working condition and the flow judgment result of the exhaust gas recirculation system under the partial load working condition according to the set judgment limit value, and finishing the final flow diagnosis of the exhaust gas recirculation system by combining the judgment results under the two working conditions.
Preferably, the engine system with the exhaust gas recirculation configuration comprises an engine controller, a rotating speed signal identification and calculation module, a misfire diagnosis module, an exhaust gas recirculation flow diagnosis module and a vehicle-mounted automatic diagnosis module which are sequentially connected in sequence through signals, wherein the engine controller is further connected with a crankshaft position sensor arranged in a vehicle engine, and an external interface for externally connecting a diagnosis instrument or a data acquisition system is reserved on the vehicle-mounted automatic diagnosis module.
Preferably, the obtaining of the accumulated misfire count at the idle condition in S1 includes the steps of:
setting a calibratable threshold value of engine speed and a calibratable threshold value of intake manifold pressure on the premise of enabling misfire diagnosis, accumulating the misfire frequency of each cylinder of the engine when the engine speed is lower than the threshold value of the engine speed and the intake manifold pressure is lower than the threshold value of the intake manifold pressure, continuously accumulating the misfire frequency of the working condition under the condition that zero clearing is not met, accumulating the calculated counting cycle frequency, and finally acquiring the calculated cycle frequency idle _ ref _ count and the misfire accumulation occurrence frequency idle _ mistfire _ accum _ count under the idle working condition.
Preferably, the obtaining of the accumulated misfire count at the partial load condition in S1 includes the steps of:
setting a calibratable threshold value of engine speed and a calibratable threshold value of intake manifold pressure on the premise of enabling misfire diagnosis, accumulating the misfire frequency of each cylinder of the engine when the engine speed is lower than the threshold value of the engine speed and the intake manifold pressure is lower than the threshold value of the intake manifold pressure, continuously accumulating the misfire frequency of the working condition under the condition that zero clearing is not met, accumulating the calculated counting cycle frequency, and finally acquiring the calculated cycle frequency run _ ref _ count and the misfire accumulated occurrence frequency run _ mistfire _ accum _ count under the partial load working condition.
Preferably, in S1, when the operating condition of the engine is switched from the partial load operating condition to the idle operating condition, the cumulative number of misfires is delayed after the idle operating condition is satisfied.
Preferably, S2 includes the steps of:
s21, when the idle speed cycle counting frequency idle _ ref _ count reaches the limit value, comparing the idle speed misfire accumulated frequency with the judgment limit value to obtain the flow judgment result of the exhaust gas recirculation system under the idle speed working condition; (ii) a
S22, when the calculated circulation frequency run _ ref _ count under the partial load working condition reaches the limit value, comparing the accumulated times of the misfire with the judgment limit value to obtain the flow judgment result of the exhaust gas recirculation system under the partial load working condition;
and S23, if and only if the judgment condition that the flow of the exhaust gas recirculation system is too high is met under the two working conditions of the idling working condition and the partial load working condition, confirming that the fault of the too high flow of the exhaust gas recirculation system occurs, and then transmitting the diagnosis result into the engine system based on the exhaust gas recirculation configuration for subsequent logic function.
The advantages of the invention are mainly embodied in the following aspects:
according to the method for judging the flow of the exhaust gas recirculation system of the vehicle, the specific condition of the flow of the exhaust gas recirculation system is accurately distinguished by performing accumulated data analysis on the fire phenomena of the engine under different working conditions, and the fault of overhigh flow of the exhaust gas recirculation system is reported by the vehicle-mounted automatic diagnosis system, so that the indirect judgment on the flow of the exhaust gas recirculation system is realized, and the requirements of related regulations are met.
In addition, the invention also provides reference for other related problems in the same field, can be expanded and extended on the basis of the reference, is applied to other technical schemes in the same field, and has very wide application prospect.
The following detailed description of the embodiments of the present invention is provided to facilitate understanding and understanding of the present invention.
Detailed Description
The invention provides a method for judging the flow of a vehicle exhaust gas recirculation system through a fire phenomenon, which comprises the following steps.
The method is based on an engine system with an exhaust gas recirculation configuration, the engine system with the exhaust gas recirculation configuration comprises an engine controller, a rotating speed signal identification and calculation module, a misfire diagnosis module, an exhaust gas recirculation flow diagnosis module and a vehicle-mounted automatic diagnosis module which are sequentially connected in a signal mode, and the vehicle control unit is further connected with a crankshaft position sensor arranged in a vehicle engine. The vehicle-mounted automatic diagnosis module has the function of connecting a diagnosis instrument or a data acquisition system, and therefore an external interface for externally connecting the diagnosis instrument or the data acquisition system is reserved on the vehicle-mounted automatic diagnosis module.
When the system runs, signals are transmitted into the vehicle control unit through a crankshaft position sensor of the engine, the real-time engine rotating speed is calculated through a rotating speed signal identification and calculation module, rotating speed information is transmitted into a fire diagnosis module, and the fire times are calculated according to a fire calculation and judgment method. And transmitting data information of the fire to an exhaust gas recirculation flow diagnosis module, accumulating the fire times of idling and non-idling according to the working conditions, comparing with calibrated limits, and judging to obtain a final diagnosis result. And finally, transmitting the diagnosis result into a vehicle-mounted automatic diagnosis module. And functions of reporting fault codes and the like are realized. The reported fault code can be read by a diagnostic instrument or a data acquisition system, and the current fault is indicated on the instrument through an MIL, so that the fault can be timely found and the attention of a driver can be attracted.
The invention discloses a flow judgment method of an exhaust gas recirculation system, which comprises the following steps:
and S1, acquiring the misfire frequency count, and obtaining the misfire frequency according to the judging logic of the misfire diagnosis, wherein the misfire frequency comprises the accumulated misfire frequency under the idling working condition and the accumulated misfire frequency under the partial load working condition.
In S1, the method for acquiring the cumulative misfire count under the idle condition includes setting a calibratable threshold value of the engine speed and a calibratable threshold value of the intake manifold pressure on the premise that the misfire diagnosis is enabled, and when the engine speed is lower than the threshold value of the engine speed and the intake manifold pressure is lower than the threshold value of the intake manifold pressure, if the flow of the exhaust gas recirculation system is too high, a misfire phenomenon occurs, so the misfire count of each cylinder of the engine is accumulated, and when the zero clearing is not satisfied, the misfire count of the idle condition is continuously accumulated, and the calculated counted number of cycles is accumulated, and finally, the calculated number of cycles idle _ ref _ count and the cumulative misfire count _ mist _ accum _ count under the idle condition are acquired.
In S1, the cumulative misfire count under the partial load condition is obtained, specifically, on the premise that the misfire diagnosis is enabled, a calibratable threshold value of the engine speed and a calibratable threshold value of the intake manifold pressure are set, when the engine speed is lower than the threshold value of the engine speed and the intake manifold pressure is lower than the threshold value of the intake manifold pressure, even if the flow rate of the exhaust gas recirculation system is too high, the misfire phenomenon is hard to occur, so the misfire counts of each cylinder of the engine are accumulated, and when the zero clearing is not satisfied, the misfire counts under the condition are continuously accumulated and the counted number of cycles are accumulated, and finally, the counted number of cycles run _ ref _ count and the counted number of misfire accumulated occurrences run _ mistfire _ accum _ count under the partial load condition are obtained.
In addition, when the operating condition of the engine is switched from the partial load operating condition to the idle operating condition in S1, due to the change of the operating condition, even if the flow of the exhaust gas recirculation system is too high, the misfire cannot be caused, so that a specific time is delayed after the idle operating condition is met, and the time length can be calibrated according to different actual engine conditions, so that the accumulated misfire frequency is carried out again.
And S2, diagnosing the flow of the exhaust gas recirculation system, judging the flow of the exhaust gas recirculation system under the idle working condition and the flow of the exhaust gas recirculation system under the partial load working condition according to the set judgment limit value, and finishing all diagnoses by combining the judgment results of the flow of the exhaust gas recirculation system under the two working conditions.
Specifically, the step S2 is as follows.
S21, when the idle speed cycle counting frequency idle _ ref _ count reaches the limit value, comparing the idle speed misfire accumulated frequency with the judgment limit value to obtain the flow judgment result of the exhaust gas recirculation system under the idle speed working condition; that is, within the limited reference cycle, the number of idle misfire is large and reaches the determination limit, and it is suspected that the flow rate of the exhaust gas recirculation system is too high. But this time cannot be taken as a final conclusion and further determination of the part load condition is required.
S22, when the calculated circulation frequency run _ ref _ count under the partial load working condition reaches the limit value, comparing the accumulated times of the misfire with the judgment limit value to obtain the flow judgment result of the exhaust gas recirculation system under the partial load working condition; that is, if the misfire count is small and the determination limit value is not reached within the limited reference cycle, it is determined that the misfire condition does not occur, and the flow rate of the exhaust gas recirculation system is excessively high.
And S23, confirming that the fault of the overhigh flow of the exhaust gas recirculation system occurs when the judgment condition of the overhigh flow of the exhaust gas recirculation system is met under the two working conditions of the idling working condition and the partial load working condition, namely the misfire occurrence rate under the two working conditions exceeds the limit value, and then transmitting the diagnosis result to an engine system with an exhaust gas recirculation configuration for subsequent logic function.
The diagnostic method is actually applied to a 32-bit engine control system, the exhaust gas recirculation system is forcibly controlled to increase the flow on a test vehicle through targeted calibration, the over-high flow state can be accurately identified, and a fault code is reported on data acquisition equipment and an MIL lamp is lightened on a vehicle instrument. Upon restoration of normal EGR system flow, the system can be diagnosed as normal and the fault code can be cleared and the MIL extinguished. Therefore, the fault can be accurately reported when the fault occurs through testing. When the fault is not in fault, the fault can be ensured not to be reported by mistake, the design requirement is met, and the design purpose is achieved
In summary, according to the method for judging the flow of the exhaust gas recirculation system of the vehicle provided by the invention, the specific situation of the flow of the exhaust gas recirculation system is accurately distinguished by performing accumulated data analysis on the misfire phenomenon of the engine under different working conditions, and then the fault of the overhigh flow of the exhaust gas recirculation system is reported by the vehicle-mounted automatic diagnosis system, so that the indirect judgment on the flow of the exhaust gas recirculation system is realized, and the requirements of relevant regulations are met.
In addition, the invention also provides reference for other related problems in the same field, can be expanded and extended on the basis of the reference, is applied to other technical schemes in the same field, and has very wide application prospect.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. A method for determining the flow rate of an exhaust gas recirculation system based on an engine system having an exhaust gas recirculation configuration, comprising the steps of:
s1, acquiring the misfire frequency count, and obtaining the misfire frequency according to the judgment logic of misfire diagnosis, wherein the misfire frequency comprises respectively counted accumulated misfire frequency under an idle working condition and accumulated misfire frequency under a partial load working condition;
s2, diagnosing the flow of the exhaust gas recirculation system, judging the flow judgment result of the exhaust gas recirculation system under the idle working condition and the flow judgment result of the exhaust gas recirculation system under the partial load working condition according to the set judgment limit value, and finishing the final flow diagnosis of the exhaust gas recirculation system by combining the judgment results under the two working conditions;
s2 includes the steps of:
s21, when the calculated circulation frequency idle _ ref _ count under the idling condition reaches the limit value, comparing the accumulated occurrence frequency of the misfire under the idling condition with the judgment limit value to obtain the flow judgment result of the exhaust gas recirculation system under the idling condition;
s22, when the calculated cycle frequency run _ ref _ count under the partial load working condition reaches the limit value, comparing the cumulative occurrence frequency of the misfire under the partial load working condition with the judgment limit value to obtain the flow judgment result of the exhaust gas recirculation system under the partial load working condition;
and S23, if and only if the judgment condition that the flow of the exhaust gas recirculation system is too high is met under the two working conditions of the idling working condition and the partial load working condition, confirming that the fault of the too high flow of the exhaust gas recirculation system occurs, and then transmitting the diagnosis result into the engine system based on the exhaust gas recirculation configuration for subsequent logic function.
2. The exhaust gas recirculation system flow rate determination method according to claim 1, characterized in that: the engine system with the exhaust gas recirculation configuration comprises an engine controller, a rotating speed signal identification and calculation module, a fire diagnosis module, an exhaust gas recirculation flow diagnosis module and a vehicle-mounted automatic diagnosis module which are sequentially connected in a signal mode, wherein the engine controller is also connected with a crankshaft position sensor arranged in a vehicle engine, and an external interface for an external diagnostic instrument or a data acquisition system is reserved on the vehicle-mounted automatic diagnosis module.
3. The exhaust gas recirculation system flow judgment method according to claim 1, wherein the obtaining of the cumulative misfire number at the idle condition in S1 comprises the steps of:
setting a calibratable threshold value of engine speed and a calibratable threshold value of intake manifold pressure on the premise of enabling misfire diagnosis, accumulating the misfire frequency of each cylinder of the engine when the engine speed is lower than the threshold value of the engine speed and the intake manifold pressure is lower than the threshold value of the intake manifold pressure, continuously accumulating the misfire frequency of the working condition under the condition that zero clearing is not met, accumulating the calculated counting cycle frequency, and finally acquiring the calculated cycle frequency idle _ ref _ count and the misfire accumulation occurrence frequency idle _ mistfire _ accum _ count under the idle working condition.
4. The exhaust gas recirculation system flow judgment method according to claim 3, wherein the obtaining of the accumulated misfire count at the part load condition in S1 comprises the steps of:
setting a calibratable engine speed threshold value and a calibratable intake manifold pressure threshold value on the premise of enabling the misfire diagnosis, accumulating the misfire frequency of each cylinder of the engine when the engine speed is higher than the engine speed threshold value and the intake manifold pressure is higher than the intake manifold pressure threshold value, continuously accumulating the misfire frequency of the working condition under the condition that zero clearing is not met, accumulating the calculated counting cycle frequency, and finally acquiring the calculated cycle frequency run _ ref _ count and the misfire accumulated occurrence frequency run _ mistfire _ accum _ count under the partial load working condition.
5. The exhaust gas recirculation system flow determination method according to claim 3, wherein in S1, when the operating condition of the engine is switched from a part load operating condition to an idle operating condition, the cumulative number of misfires is delayed after the idle operating condition is satisfied.
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| JPH10121947A (en) * | 1996-10-15 | 1998-05-12 | Ford Global Technol Inc | Method for estimating middle bed temperature of catalyst converter on exhaust system of internal combustion engine provided with at least one cylinder |
| CN105264204A (en) * | 2013-06-05 | 2016-01-20 | 丰田自动车株式会社 | Misfire detection system for internal combustion engine |
| CN106560612A (en) * | 2015-10-06 | 2017-04-12 | 现代自动车株式会社 | Method For Controlling Exhaust Gas Recirculation System Of Vehicle |
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| JP6221321B2 (en) * | 2013-04-17 | 2017-11-01 | 株式会社デンソー | Control device for internal combustion engine |
| US9909551B2 (en) * | 2015-07-10 | 2018-03-06 | Robert Bosch Gmbh | Method of engine control for eliminating knocking combustion due to a misfire for spark-ignited engines equipped with external exhaust gas recirculation |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10121947A (en) * | 1996-10-15 | 1998-05-12 | Ford Global Technol Inc | Method for estimating middle bed temperature of catalyst converter on exhaust system of internal combustion engine provided with at least one cylinder |
| CN105264204A (en) * | 2013-06-05 | 2016-01-20 | 丰田自动车株式会社 | Misfire detection system for internal combustion engine |
| CN106560612A (en) * | 2015-10-06 | 2017-04-12 | 现代自动车株式会社 | Method For Controlling Exhaust Gas Recirculation System Of Vehicle |
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