CN103759907A - EGR pipeline fault detection method - Google Patents
EGR pipeline fault detection method Download PDFInfo
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- CN103759907A CN103759907A CN201410032636.4A CN201410032636A CN103759907A CN 103759907 A CN103759907 A CN 103759907A CN 201410032636 A CN201410032636 A CN 201410032636A CN 103759907 A CN103759907 A CN 103759907A
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Abstract
The invention provides an EGR pipeline fault detection method which comprises the steps that a first amplitude relation graph is obtained in advance when an EGR pipeline has no faults, a second amplitude relation graph is obtained in fault detection of the EGR pipeline, and if the EGR pipeline has faults is judged according to the comparison result of the first amplitude relation graph and the second amplitude relation graph. In the step of obtaining the first amplitude relation graph, in the set opening degree change control process of an EGR valve, a pressure sensor arranged in front of a turbocharger is used for obtaining pressure values; in the process of obtaining opening degree change control, the correspondence graph of opening degree change amplitude of the EGR valve and the pressure value changing amplitude is regarded as the first amplitude relation graph. According to the method, due to the fact that EGR pipeline fault detection can be achieved without an air inlet flow sensor, the overall cost of an EGR engine can be effectively lowered.
Description
Technical field
The present invention relates to engine art, in particular, relate to a kind of EGR circuit failure detection method.
Background technology
Exhaust gas recirculatioon (ExhaustGasRecirculation, EGR) is that mean engine imports the part of Exhaust Gas suction side and makes its air-breathing technology once again after burning.Its fundamental purpose is can improve rate of fuel consumption rate can reduce oxides of nitrogen (NO x) in Exhaust Gas and share sub-load time.
For EGR engine, need to carry out the corresponding security that guarantees engine operation that detects to the fault of egr system.Wherein, the fault diagnosis of EGR valve itself can be carried out electric fault judgement clamping stagnation or electrical damage by EGR valve self-sensor device; In addition, also need the gas leakage of EGR pipeline or obstruction to judge; To this, mode of the prior art is to adopt intake flow sensor to detect charge flow rate, thereby can whether over default detected value, judge whether EGR pipeline exists gas leakage or block according to charge flow rate.
Inventor finds through research, the mode that detects EGR pipeline in prior art must need to be provided with intake flow sensor and could realize, and intake flow sensor is not necessary parts in some EGR engine, thus intake flow sensor the holistic cost that has improved EGR engine is set.
Summary of the invention
In view of this, the invention provides EGR circuit failure detection method, to realize the object of the holistic cost that reduces EGR engine.
For achieving the above object, the invention provides following technical scheme:
An EGR circuit failure detection method, comprising:
When the non-fault of EGR pipeline, obtain in advance the first wave amplitude graph of a relation, comprise step:
In the aperture that EGR valve is set, change in the process of controlling the force value of simultaneously obtaining by the pressure transducer of being located at before turbosupercharger;
Obtain described aperture and change the aperture amplitude of variation of EGR valve and the corresponding relation figure of described force value amplitude of variation described in the process of controlling, described graph of a relation is described the first wave amplitude graph of a relation;
When carrying out the detection of EGR circuit failure, comprise step:
In the aperture that EGR valve is set, change in the process of controlling the force value of simultaneously obtaining by the pressure transducer of being located at before turbosupercharger;
Obtain described aperture and change the aperture amplitude of variation of EGR valve and the corresponding relation figure of described force value amplitude of variation described in the process of controlling, described graph of a relation is described the second wave amplitude graph of a relation;
According to the comparative result of described the first wave amplitude graph of a relation and the second wave amplitude graph of a relation, judge whether fault of described EGR pipeline.
Preferably, in embodiments of the present invention, the described first wave amplitude graph of a relation that obtains in advance when the non-fault of EGR pipeline, carries out the detection of EGR circuit failure with described, all in same steady working condition.
Preferably, in embodiments of the present invention, the described aperture that EGR valve is set changes to be controlled, and comprising:
The angle value of described EGR valve open angle is periodically fluctuateed.
Preferably, in embodiments of the present invention, described periodic fluctuation, comprising:
The square wave of setpoint frequency or sine wave.
Preferably, in embodiments of the present invention, the described angle that EGR valve is set changes the process of controlling, and comprising:
Release conditions discharges, and described periodic fluctuation superposition is exported in aperture to closed-loop control.
Preferably, in embodiments of the present invention, described according to the comparative result of described the first wave amplitude graph of a relation and the second wave amplitude graph of a relation, judge whether fault of described EGR pipeline, comprising:
When the difference of described the first wave amplitude graph of a relation and the second wave amplitude graph of a relation belongs to pre-set interval value, judge that described EGR pipeline is as non-fault.
Preferably, in embodiments of the present invention, described according to the comparative result of described the first wave amplitude graph of a relation and the second wave amplitude graph of a relation, judge whether fault of described EGR pipeline, also comprise:
When the difference of described the first wave amplitude graph of a relation and the second wave amplitude graph of a relation is less than the minimum value of described pre-set interval value, judge that described EGR pipeline is principal fault.
Preferably, in embodiments of the present invention, described according to the comparative result of described the first wave amplitude graph of a relation and the second wave amplitude graph of a relation, judge whether fault of described EGR pipeline, also comprise:
When the difference of described the first wave amplitude graph of a relation and the second wave amplitude graph of a relation is greater than the maximal value of described pre-set interval value, judge that described EGR pipeline is plugging fault.。
Known via above-mentioned technical scheme, the embodiment of the present invention has been utilized the pressure transducer before turbosupercharger, when the non-fault of EGR pipeline, by the angle that EGR valve is set, change and control in advance, obtain the variation wave amplitude of the measured force value of corresponding pressure transducer, thereby obtain EGR pipeline when normal, EGR valve enters the corresponding relation that records pressure amplitude value of angle variance values and pressure transducer, and then can be when detecting, whether the corresponding relation that records pressure amplitude value that enters angle variance values and pressure transducer by again obtaining EGR valve comes the pressure of verification EGR pipeline normal, and then judge whether EGR pipeline exists gas leakage or stop up.
In the embodiment of the present invention, do not need to be provided with intake flow sensor and just can realize the fault detect of EGR pipeline, so effectively reduce the holistic cost of EGR engine.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skills, do not paying under the prerequisite of creative work, other accompanying drawing can also be provided according to the accompanying drawing providing.
Fig. 1 is the step schematic diagram of the detection method of EGR circuit failure described in the embodiment of the present invention;
Fig. 2 is the structural representation of EGR engine described in the embodiment of the present invention;
Fig. 3 judges the whether logical schematic of fault of EGR pipeline described in the embodiment of the present invention;
Fig. 4 judges the whether another logical schematic of fault of EGR pipeline described in the embodiment of the present invention;
Fig. 5 is the logical schematic that EGR circuit failure described in the embodiment of the present invention detects.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
The invention provides a kind of fault detection method, as shown in Figure 1, comprise step:
When the non-fault of EGR pipeline, obtain in advance the first wave amplitude graph of a relation, comprising:
S11, in aperture that EGR valve is set, change in the process of controlling the force value of simultaneously obtaining by the pressure transducer of being located at before turbosupercharger;
With reference to figure 2, in embodiments of the present invention, inventor has utilized in the EGR pipeline of EGR engine and has been located at the pressure transducer 02 before turbosupercharger; Concrete thought is: under steady working condition, the variation of the aperture that EGR valve 01 enters can make pressure before turbosupercharger produce corresponding variation, the obtaining of the force value that the situation of change of the pressure before turbosupercharger can be obtained by pressure transducer 02 herein.Inventor finds, in the situation that steady working condition is approximate, particularly under same steady working condition, when EGR pipeline is non-fault, the aperture of EGR valve 01 is carried out the variation of certain amplitude, can make to be located at the force value that the pressure transducer 02 before turbosupercharger obtains and also carry out the variation of corresponding amplitude thereupon; And when EGR line clogging or gas leakage, if or the aperture of EGR valve 01 were carried out to the variation of original amplitude, the amplitude of variation of being now located at the force value that the pressure transducer 02 before turbosupercharger obtains will have larger difference with original amplitude of variation.
Such as, if EGR line clogging is now carried out the aperture of EGR valve the variation of original amplitude, the amplitude of variation of being now located at the force value that the pressure transducer before turbosupercharger obtains is just much larger than original amplitude of variation.In addition,, if the variation of original amplitude is now carried out the aperture of EGR valve in EGR pipeline gas leakage, the amplitude of variation of being now located at the force value that the pressure transducer before turbosupercharger obtains is just little much than original amplitude of variation.
During for definite non-fault of EGR pipeline, when the aperture of EGR valve is carried out the variation of certain amplitude, be located at the range value of the force value respective change of the pressure transducer before turbosupercharger, first need to change in the process of controlling in the aperture that EGR valve is set the force value of simultaneously obtaining by the pressure transducer of being located at before turbosupercharger.
In actual applications, in order to obtain the first wave amplitude graph of a relation more stable, that have more reference value, when the aperture of setting at control EGR valve changes, can make the angle value of EGR valve open angle periodically fluctuate, because the trough of every secondary undulation and the value of crest are all identical, thereby can controlling EGR valve, to carry out repeatedly the amplitude that aperture changes be all identical, the amplitude of variation that like this, also will make to be located at the force value that the pressure transducer before turbosupercharger obtains is more stable.Concrete, the periodic fluctuation in the embodiment of the present invention can adopt square wave or the sine wave of setpoint frequency.
S12, obtain described aperture and change the aperture amplitude of variation of EGR valve and the corresponding relation figure of described force value amplitude of variation described in the process of controlling, described graph of a relation is described the first wave amplitude graph of a relation;
Based on above inventive principle, in embodiments of the present invention, when the non-fault of EGR pipeline, obtained in advance the first wave amplitude graph of a relation, by obtaining the aperture of the EGR valve under a certain steady state condition, set the variation of amplitude, the reference value when corresponding relation figure of the corresponding amplitude of variation of the force value obtaining with pressure transducer before turbosupercharger is usingd as fault detect.
When carrying out the detection of EGR circuit failure,
S13, in aperture that EGR valve is set, change in the process of controlling the force value of simultaneously obtaining by the pressure transducer of being located at before turbosupercharger;
When EGR pipeline is normal, the aperture of the EGR valve obtaining is in an identical manner set the variation of amplitude, and the corresponding relation figure of the corresponding amplitude of variation of the force value obtaining with pressure transducer before turbosupercharger, should be approximate with the first wave amplitude graph of a relation; If difference is excessive, just can judge that EGR pipeline is in malfunction.For this reason, while carrying out the detection of EGR circuit failure, under the steady working condition identical with obtaining the first wave amplitude graph of a relation, S11 is similar with step, the aperture that EGR valve is set changes the process of controlling, the force value of simultaneously obtaining by the pressure transducer of being located at before turbosupercharger.
S14, obtain described aperture and change the aperture amplitude of variation of EGR valve and the corresponding relation figure of described force value amplitude of variation described in the process of controlling, described graph of a relation is described the second wave amplitude graph of a relation;
In obtaining EGR pipeline, after the force value that the pressure transducer before current turbosupercharger obtains, and then just can obtain the corresponding relation figure of aperture amplitude of variation and the described force value amplitude of variation of current EGR valve, that is, and the second wave amplitude graph of a relation.
S15, according to the comparative result of described the first wave amplitude graph of a relation and the second wave amplitude graph of a relation, judge whether fault of described EGR pipeline.
Due to existing the first wave amplitude graph of a relation as a reference, so, after obtaining the second wave amplitude graph of a relation, just can be by the first wave amplitude graph of a relation and the second wave amplitude graph of a relation relatively judge whether fault of EGR pipeline.
In actual applications, can carry out quantitative judgement by the mode of pre-set interval,, when the difference of the first wave amplitude graph of a relation and the second wave amplitude graph of a relation belongs to pre-set interval value, illustrate that now the similarity of the first wave amplitude graph of a relation and the second wave amplitude graph of a relation is higher, so can judge that described EGR pipeline is as non-fault.When if this difference does not belong to pre-set interval value, illustrate that now the difference of the first wave amplitude graph of a relation and the second wave amplitude graph of a relation is excessive, so can judge that described EGR pipeline is fault.
Further, can also further comprise following mode, with further failure judgement reason, concrete:
On the one hand, as shown in Figure 3, when the difference of described the first wave amplitude graph of a relation and the second wave amplitude graph of a relation is less than the minimum value of described pre-set interval value, judge that described EGR pipeline is principal fault.Such as, when the first wave amplitude graph of a relation deducts the difference that the second wave amplitude graph of a relation obtains, than the minimum value of pre-set interval value, also want hour, illustrate the variation of EGR valve opening on turbosupercharger before the degree of impact of pressure diminish, and amplitude of variation is excessive, now EGR pipeline is principal fault.
On the other hand, as shown in Figure 4, when the difference of described the first wave amplitude graph of a relation and the second wave amplitude graph of a relation is greater than the maximal value of described pre-set interval value, judge that described EGR pipeline is plugging fault.Such as, when the first wave amplitude graph of a relation deducts the difference that the second wave amplitude graph of a relation obtains, when also large than the maximal value of pre-set interval value, illustrate EGR valve opening change on turbosupercharger before the degree of impact of pressure become greatly, and amplitude of variation is excessive, now EGR pipeline is plugging fault.
In actual applications, EGR circuit failure detection method in the embodiment of the present invention, can be included in the OBD(On-Board Diagnostics of EGR engine, mounted automatic diagnosis) in detection strategy, concrete, when engine normally moves, EGR valve carries out work according to Closed-loop Control Strategy; When carrying out OBD detection, release conditions discharges, and by this fluctuation superposition, on closed-loop control output aperture, specific implementation logic can be as shown in Figure 5.
In the embodiment of the present invention, in engine control strategy, release conditions refers to the isoparametric scope restriction of rotating speed, oil mass, water temperature, EGR valve opening for engine, when the state of each parameter of present engine meets the scope of setting, OBD measuring ability is carried out in the vibration that just can carry out EGR valve, the Rule of judgment consisting of the scope that whether meets above-mentioned various settings, is release conditions.
In sum, in embodiments of the present invention, utilized the pressure transducer before turbosupercharger, when the non-fault of EGR pipeline, by the angle that EGR valve is set, change and control in advance, obtain the variation wave amplitude of the measured force value of corresponding pressure transducer, thereby obtain EGR pipeline when normal, EGR valve enters the corresponding relation that records pressure amplitude value of angle variance values and pressure transducer, and then can be when detecting, whether the corresponding relation that records pressure amplitude value that enters angle variance values and pressure transducer by again obtaining EGR valve comes the pressure of verification EGR pipeline normal, and then judge whether EGR pipeline exists gas leakage or stop up.In the embodiment of the present invention, do not need to be provided with intake flow sensor and just can realize the fault detect of EGR pipeline, so effectively reduce the holistic cost of EGR engine.
In this instructions, each embodiment adopts the mode of going forward one by one to describe, and each embodiment stresses is the difference with other embodiment, between each embodiment identical similar part mutually referring to.For the device providing for embodiment, because its method providing with embodiment is corresponding, so description is fairly simple, relevant part partly illustrates referring to method.
Above-mentioned explanation to provided embodiment, makes professional and technical personnel in the field can realize or use the present invention.To the multiple modification of these embodiment, will be apparent for those skilled in the art, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle provided in this article and features of novelty.
Claims (8)
1. an EGR circuit failure detection method, is characterized in that, comprising:
When the non-fault of EGR pipeline, obtain in advance the first wave amplitude graph of a relation, comprise step:
In the aperture that EGR valve is set, change in the process of controlling the force value of simultaneously obtaining by the pressure transducer of being located at before turbosupercharger;
Obtain described aperture and change the aperture amplitude of variation of EGR valve and the corresponding relation figure of described force value amplitude of variation described in the process of controlling, described graph of a relation is described the first wave amplitude graph of a relation;
When carrying out the detection of EGR circuit failure, comprise step:
In the aperture that EGR valve is set, change in the process of controlling the force value of simultaneously obtaining by the pressure transducer of being located at before turbosupercharger;
Obtain described aperture and change the aperture amplitude of variation of EGR valve and the corresponding relation figure of described force value amplitude of variation described in the process of controlling, described graph of a relation is described the second wave amplitude graph of a relation;
According to the comparative result of described the first wave amplitude graph of a relation and the second wave amplitude graph of a relation, judge whether fault of described EGR pipeline.
2. according to the circuit failure of EGR described in claim 1 detection method, it is characterized in that the described first wave amplitude graph of a relation that obtains in advance carries out the detection of EGR circuit failure with described, all in same steady working condition when the non-fault of EGR pipeline.
3. according to the circuit failure of EGR described in claim 2 detection method, it is characterized in that, the described aperture that EGR valve is set changes to be controlled, and comprising:
The angle value of described EGR valve open angle is periodically fluctuateed.
4. according to the circuit failure of EGR described in claim 3 detection method, it is characterized in that, described periodic fluctuation, comprising:
The square wave of setpoint frequency or sine wave.
5. according to the circuit failure of EGR described in claim 4 detection method, it is characterized in that, the described angle that EGR valve is set changes the process of controlling, and comprising:
Release conditions discharges, and described periodic fluctuation superposition is exported in aperture to closed-loop control.
6. according to the circuit failure of EGR described in claim 5 detection method, it is characterized in that, described according to the comparative result of described the first wave amplitude graph of a relation and the second wave amplitude graph of a relation, judge whether fault of described EGR pipeline, comprising:
When the difference of described the first wave amplitude graph of a relation and the second wave amplitude graph of a relation belongs to pre-set interval value, judge that described EGR pipeline is as non-fault.
7. according to the circuit failure of EGR described in claim 6 detection method, it is characterized in that, described according to the comparative result of described the first wave amplitude graph of a relation and the second wave amplitude graph of a relation, judge whether fault of described EGR pipeline, also comprise:
When the difference of described the first wave amplitude graph of a relation and the second wave amplitude graph of a relation is less than the minimum value of described pre-set interval value, judge that described EGR pipeline is principal fault.
8. according to the circuit failure of EGR described in claim 7 detection method, it is characterized in that, described according to the comparative result of described the first wave amplitude graph of a relation and the second wave amplitude graph of a relation, judge whether fault of described EGR pipeline, also comprise:
When the difference of described the first wave amplitude graph of a relation and the second wave amplitude graph of a relation is greater than the maximal value of described pre-set interval value, judge that described EGR pipeline is plugging fault.
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| CN107401462A (en) * | 2016-05-18 | 2017-11-28 | 福特环球技术公司 | For operating the method and system of engine |
| CN107478421A (en) * | 2017-08-08 | 2017-12-15 | 山东泰展机电科技股份有限公司 | A kind of magnetic valve open degree method of testing and system |
| CN107782560A (en) * | 2017-11-20 | 2018-03-09 | 潍柴动力股份有限公司 | A kind of bypass type booster fault detection method and device |
| CN109186886A (en) * | 2018-07-24 | 2019-01-11 | 锦州秀亭制管有限公司 | The airtight detection method and equipment of automobile cooler for recycled exhaust gas pipe |
| CN111122148A (en) * | 2019-12-17 | 2020-05-08 | 重庆南方数控设备股份有限公司 | Method for detecting blood by prejudging working state of electromagnetic valve based on hemorheometer |
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| CN104005885A (en) * | 2014-05-26 | 2014-08-27 | 潍柴动力股份有限公司 | Pipe blocking degree detecting method and device of exhaust gas recirculation system |
| CN104005885B (en) * | 2014-05-26 | 2016-08-24 | 潍柴动力股份有限公司 | A kind of pipeline blockage degree detecting method and device of gas recirculation system |
| CN104568344A (en) * | 2014-10-09 | 2015-04-29 | 芜湖扬宇机电技术开发有限公司 | EGR (Exhaust Gas Recirculation) pipeline fault detection diagnosis method |
| CN107401462B (en) * | 2016-05-18 | 2021-10-26 | 福特环球技术公司 | Method and system for operating an engine |
| CN107401462A (en) * | 2016-05-18 | 2017-11-28 | 福特环球技术公司 | For operating the method and system of engine |
| CN107478421A (en) * | 2017-08-08 | 2017-12-15 | 山东泰展机电科技股份有限公司 | A kind of magnetic valve open degree method of testing and system |
| CN107782560A (en) * | 2017-11-20 | 2018-03-09 | 潍柴动力股份有限公司 | A kind of bypass type booster fault detection method and device |
| CN109186886A (en) * | 2018-07-24 | 2019-01-11 | 锦州秀亭制管有限公司 | The airtight detection method and equipment of automobile cooler for recycled exhaust gas pipe |
| CN111122148A (en) * | 2019-12-17 | 2020-05-08 | 重庆南方数控设备股份有限公司 | Method for detecting blood by prejudging working state of electromagnetic valve based on hemorheometer |
| CN111122148B (en) * | 2019-12-17 | 2021-11-26 | 重庆南方数控设备股份有限公司 | Method for detecting blood by prejudging working state of electromagnetic valve based on hemorheometer |
| CN111413100A (en) * | 2020-03-26 | 2020-07-14 | 安徽华菱汽车有限公司 | Error reporting method and system for simulating exhaust gas circulation quantity abnormality of EGR (exhaust gas recirculation) system |
| CN114562396A (en) * | 2022-03-28 | 2022-05-31 | 江铃汽车股份有限公司 | Method for verifying reliability of low-temperature working condition of EGR (exhaust gas Recirculation) system |
| CN115096596A (en) * | 2022-06-27 | 2022-09-23 | 中国第一汽车股份有限公司 | Method, device, equipment and medium for diagnosing low-pressure EGR (exhaust gas Recirculation) system of engine |
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