CN103726930B - The failure detector of a kind of exhaust gas recirculation engines and method - Google Patents
The failure detector of a kind of exhaust gas recirculation engines and method Download PDFInfo
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- CN103726930B CN103726930B CN201310660648.7A CN201310660648A CN103726930B CN 103726930 B CN103726930 B CN 103726930B CN 201310660648 A CN201310660648 A CN 201310660648A CN 103726930 B CN103726930 B CN 103726930B
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- 238000001514 detection method Methods 0.000 claims abstract description 32
- 230000003134 recirculating effect Effects 0.000 claims abstract description 8
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- 238000006731 degradation reaction Methods 0.000 claims description 13
- 238000012544 monitoring process Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 38
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- 238000001816 cooling Methods 0.000 description 5
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- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000013024 troubleshooting Methods 0.000 description 1
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Abstract
The embodiment of the present invention provides a kind of failure detector and the method for exhaust gas recirculation engines, described device is that recirculation electromotor arranges the first recirculated water valve, described specifically include: controller, be used for closing recirculation (egr) valve, and close the first recirculated water valve according to instruction; First recirculated water valve, is used for controlling the first recirculated water and is turned on and off circulation; Described first recirculated water is the recirculated water of recirculating system; Temperature sensor, for, after closing recirculation (egr) valve, carrying out temperature detection to the second recirculated water, obtain the first water temperature; After the first recirculated water valve closing, described second recirculated water is carried out temperature detection, obtains the second water temperature; Described second recirculated water is circulating water of engine; Processor, is used for judging that whether described first water temperature is higher than first threshold, if it is the first recirculated water valve is closed in instruction; Judge that whether described second water temperature is higher than Second Threshold, if otherwise fault type being defined as recycle cooler fault.
Description
Technical field
The present invention designs technical field of engines, particularly to failure detector and the method for a kind of exhaust gas recirculation engines.
Background technology
Exhaust gas recirculatioon (ExhaustGasRecirculation, be called for short EGR) be a kind of design for automobile engine be used as mode. The principle of EGR engine is, after engine combustion, the part discharging gas is gone out and again sucks in electromotor, to reduce the amount of nitrogen oxides discharged in gas, and plays certain energy-conserving action. In the middle of EGR technology, cooler (ExhaustGasRecirculationCooler is called for short EGRC) is its key components. Reduce EGR gas temperature by EGRC, it is possible to the significant emission reduction effect improving nitrogen oxides, be also avoided that the too high control valve damaging EGR of EGT simultaneously.
In the middle of EGR engine, the common circulating water temperature that a kind of phenomenon of the failure is electromotor is too high, " phenomenon of boiling " being namely commonly called as. The fault of the water circulation component (with water pump or thermostat etc.) of the EGRC faults itself decline of EGRC performance (fault of such as EGRC) and EGRC itself, is all likely to result in cooling effectiveness and declines, and the circulating water temperature causing electromotor is too high.
If there is the phenomenon that cycle of engine coolant-temperature gage is too high in prior art, then by closing recirculation (egr) valve with a series of restriction of limit engine torque, to guarantee circulating water of engine water temperature drop, detection and the maintenance of fault will be carried out afterwards again.
Prior art has the disadvantage that, and not all causes the fault that cycle of engine coolant-temperature gage rises, it is necessary to makes water temperature return by restricting moment of torsion normal, and limits engine torque and will affect the performance of engine power performance; So all limit the troubleshooting methodology of moment of torsion in the middle of prior art for all faults, it may not be necessary to reduction engine power, affect the properly functioning of electromotor.
Summary of the invention
In view of this, it is an object of the invention to provide the failure detector of a kind of exhaust gas recirculation engines and method, to realize failure judgement reason accurately, and take restriction for fault.
For achieving the above object, the present invention has following technical scheme:
A kind of failure detector of exhaust gas recirculation engines, described device is that recirculation electromotor arranges the first recirculated water valve, described in specifically include:
Controller, is used for cutting out recirculation (egr) valve, and cuts out the first recirculated water valve according to instruction;
First recirculated water valve, is used for controlling the first recirculated water and is turned on and off circulation; Described first recirculated water is the recirculated water of recirculating system;
Temperature sensor, for, after closing recirculation (egr) valve, carrying out temperature detection to the second recirculated water, obtain the first water temperature; After the first recirculated water valve closing, described second recirculated water is carried out temperature detection, obtains the second water temperature; Described second recirculated water is circulating water of engine;
Processor, is used for judging that whether described first water temperature is higher than first threshold, if it is the first recirculated water valve is closed in instruction; Judge that whether described second water temperature is higher than Second Threshold, if otherwise fault type being defined as recycle cooler fault.
Described temperature sensor is additionally operable to the temperature of gas after detection engine cool;
Then processor is additionally operable to; After judging described engine cool, whether the temperature of gas is higher than gas temperature threshold value, if gas temperature is higher than gas temperature threshold value, then controller described in instruction cuts out recirculation (egr) valve, otherwise it is assumed that described electromotor fault-free.
Described processor judges whether described first water temperature also includes higher than first threshold:
When described first water temperature is lower than first threshold, then fault type is defined as recycle cooler performance degradation.
Described processor judges whether described second water temperature also includes higher than Second Threshold:
When described second water temperature is higher than Second Threshold, then fault type being defined as the second water circulation component fault, described second water circulation component is the water circulation component of electromotor.
Described controller is additionally operable to repeatedly switch the first recirculated water valve;
Then described temperature sensor is additionally operable to described second recirculated water to be carried out temperature detection, obtains the 3rd water temperature when the first recirculated water valve switchs repeatedly;
Then described processor is additionally operable to; Monitoring the 3rd water temperature, when opening the first circulating-water valve behind the door, the 3rd water temperature raises, and closes the first circulating-water valve behind the door, and the 3rd declines, then fault type is defined as recycle cooler fault;
Described recycle cooler fault is specially the gas circuit of recycle cooler and reveals.
A kind of fault detection method of exhaust gas recirculation engines, described method is that recirculation electromotor arranges the first recirculated water valve, with control the first recirculated water be turned on and off circulation; Described first recirculated water is the recirculated water of recirculating system; Said method comprising the steps of:
After closing recirculation (egr) valve, the second recirculated water is carried out temperature detection and obtains the first water temperature, it is judged that whether described first water temperature is higher than first threshold; Described second recirculated water is circulating water of engine;
When described first water temperature is higher than first threshold, then close the first recirculated water valve, after closing the first recirculated water valve, described second recirculated water is carried out temperature detection, obtain the second water temperature;
Judge that whether described second water temperature is higher than Second Threshold; If described second water temperature is not higher than Second Threshold, then fault type is defined as recycle cooler fault.
Described closedown recirculation (egr) valve particularly as follows:
After judging described engine cool, whether the temperature of gas is higher than gas temperature threshold value, if gas temperature is higher than gas temperature threshold value, then closes recirculation (egr) valve, otherwise it is assumed that described electromotor fault-free.
Described method also includes:
When described first water temperature is lower than first threshold, then fault type is defined as recycle cooler performance degradation.
Described method also includes:
When described second water temperature is higher than Second Threshold, then fault type being defined as the second water circulation component fault, described second water circulation component is the water circulation component of electromotor.
The described recycle cooler fault that is defined as by fault type also includes:
Repeatedly switch the first recirculated water valve, and described second recirculated water is carried out temperature detection simultaneously, obtain the 3rd water temperature;
If when opening the first circulating-water valve behind the door, the 3rd water temperature raises, and closes the first circulating-water valve behind the door, and the 3rd declines, then fault type is defined as recycle cooler fault;
Described recycle cooler fault is specially the gas circuit of recycle cooler and reveals.
As seen through the above technical solutions, present invention existence provides the benefit that: by setting up the first recirculated water valve, judge the Changing Pattern closing the first water temperature after recirculation (egr) valve with the second water temperature closed after the first recirculated water valve, realize concluding of EGRC fault, thus avoiding unnecessary restriction moment of torsion, it is ensured that electromotor properly functioning; More complete water temperature judgment mechanism can also be passed through, conclude fault three kinds different accurately; And by repeatedly switching the first recirculated water valve, it is achieved conclude EGRC fault more accurately, eliminate the interference of accidentalia.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is method flow diagram described in the embodiment of the present invention;
Fig. 2 is apparatus structure schematic diagram described in the embodiment of the present invention;
Fig. 3 is method flow diagram described in another embodiment of the present invention;
Fig. 4 is apparatus structure schematic diagram described in another embodiment of the present invention.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is a part of embodiment of the present invention, rather than whole embodiments. Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.
In the present invention, the targeted fault type of described fault detect mainly has three kinds:
One is EGRC fault, and the gas circuit that the fault of so-called EGRC is exactly mainly EGRC is revealed, and the engine exhaust gas of recirculation enters in the middle of the water circulation of EGRC, causes that cooling effectiveness declines, and cycle of engine coolant-temperature gage rises. But with reference to the operation principle of EGR engine, being not required to carry out torque limit, only need to stop the water circulation of EGRC during the fault of EGRC, circulating water temperature will decline.
Two is the water circulation component fault of electromotor, the fault of such as water pump or thermostat, in view of the operation principle of EGR engine is it is recognised that even if the feature of engine water recirculation assembly fault is to stop the water circulation of EGRC, the circulating water temperature of electromotor still will not decline.
Three is the performance degradation of EGRC; Actually so-called performance degradation is caused by carbon distribution deposition in EGRC, is not the fault caused due to physical damage; The feature of the performance degradation of EGRC is, as long as closing recirculation (egr) valve, the water temperature of circulating water of engine will decline.
Based on the feature of three of the above fault, failure detector of the present invention and method, no longer when fault occurs, perform close recirculation (egr) valve and limit the restriction of engine torque simultaneously. But it is additionally arranged a first recirculated water valve for the circulation of EGRC water, according to ad hoc fashion operation recirculation (egr) valve successively and the first recirculated water valve, thus finding the particular type of fault accurately.
A specific embodiment for the method for the invention shown in Figure 1. Owing to simple EGRC fault is without limiting moment of torsion, so in order to avoid unnecessary restriction moment of torsion, the main purpose of method described in the present embodiment is in that to detect the fault of EGRC. In described method, EGR engine adds the first recirculated water valve, with control the first recirculated water be turned on and off circulation; Described first recirculated water is the recirculated water of EGRC. Said method comprising the steps of:
After step 101, closedown recirculation (egr) valve, the second recirculated water is carried out temperature detection and obtains the first water temperature, it is judged that whether described first water temperature is higher than first threshold; Described second recirculated water is circulating water of engine.
Step 102, when described first water temperature is higher than first threshold, then close the first recirculated water valve, after closing the first recirculated water valve, described second recirculated water carried out temperature detection, obtain the second water temperature.
Step 103, judge that described second water temperature is whether higher than Second Threshold; If described second water temperature is not higher than Second Threshold, then fault type is defined as recycle cooler fault.
As detected whether a certain fault is EGRC fault, then the feature according to EGRC fault is needed to judge. It is to say, when EGRC fault, then close recirculation (egr) valve and will not cause being decreased obviously of the second recirculated water water temperature; And after closing recirculation (egr) valve, further close the first recirculated water valve, then can cause being decreased obviously of the second recirculated water water temperature.
So the present embodiment is now closed recirculation (egr) valve, turn off the first recirculated water valve; Choose after closing after recirculation (egr) valve and closing the first recirculated water valve two nodes and carry out the temperature survey of the second recirculated water, obtain the first water temperature and the second water temperature; And first threshold and Second Threshold are set according to actual working condition.
If the first water temperature is higher than first threshold, then, after illustrating to close recirculation (egr) valve, water temperature does not decline significantly; And second water temperature lower than Second Threshold, after adding bright closedown the first recirculated water valve, water temperature decreases drastically. Such then meet the Rule of judgment of EGRC fault, so concluding that this fault is EGRC fault.
A specific embodiment of device of the present invention it is shown with reference to Fig. 2. Device described in the present embodiment is the entity apparatus realizing method described in embodiment illustrated in fig. 1. Associated description in embodiment illustrated in fig. 1 is equally applicable in the present embodiment, device described in the present embodiment add in EGR engine one can limit EGRC water circulation the first recirculated water valve, described in specifically include:
Controller, is used for cutting out recirculation (egr) valve, and cuts out the first recirculated water valve according to instruction.
First recirculated water valve, is used for controlling the first recirculated water and is turned on and off circulation;Described first recirculated water is the recirculated water of recirculating system.
Temperature sensor, for, after closing recirculation (egr) valve, carrying out temperature detection to the second recirculated water, obtain the first water temperature; After the first recirculated water valve closing, described second recirculated water is carried out temperature detection, obtains the second water temperature; Described second recirculated water is circulating water of engine.
Processor, is used for judging that whether described first water temperature is higher than first threshold, if it is the first recirculated water valve is closed in instruction; Judge that whether described second water temperature is higher than Second Threshold, if otherwise fault type being defined as recycle cooler fault.
Fig. 1��2 illustrated embodiment is the basic embodiment of the method for the invention and device. By above description, the existence of above-mentioned two embodiment provides the benefit that: by setting up the first recirculated water valve, judge the Changing Pattern closing the first water temperature after recirculation (egr) valve with the second water temperature closed after the first recirculated water valve, realize concluding of EGRC fault, thus avoiding unnecessary restriction moment of torsion, it is ensured that electromotor properly functioning.
With reference to shown in Fig. 3, for another specific embodiment of the method for the invention. In the present embodiment, described method is the further perfect judgment mechanism for the second circulating water temperature on the basis of embodiment illustrated in fig. 1 so that can conclude fault three kinds different accurately by described method. Described method specifically includes following steps:
Step 301, judge that the temperature of gas, whether higher than gas temperature threshold value, if gas temperature is higher than gas temperature threshold value, then closes recirculation (egr) valve after described engine cool, otherwise it is assumed that described electromotor fault-free.
In the present embodiment, the condition of trigger fault detection method is in that the temperature of gas after the cooling of detection electromotor. Namely described gas temperature threshold value is judge the temperature whether standard within normal range of gas after cooling, if gas temperature exceeds standard, then illustrates that the cooling of EGRC exists fault, then closes recirculation (egr) valve, starts fault detect flow process. Otherwise it is assumed that EGRC be in properly functioning in the middle of.
After step 302, closedown recirculation (egr) valve, the second recirculated water carrying out temperature detection and obtains the first water temperature, described second recirculated water is circulating water of engine.
Step 303, judge that described first water temperature is whether higher than first threshold; If lower than first threshold, enter step 304, otherwise enter step 305.
Aforementioned known, if fault is the performance degradation of EGRC, then there is the feature closing the water temperature drop that recirculation (egr) valve can cause the second recirculated water; If but fault is EGRC fault or the second water circulation component fault, then after closing recirculation (egr) valve, the temperature of the second recirculated water does not have and obviously declines. So the present embodiment sets first threshold for this water temperature Changing Pattern, namely can determine that or get rid of the situation of EGRC performance degradation.
Step 304, when described first water temperature is lower than first threshold, then fault type is defined as recycle cooler performance degradation.
If described first water temperature substantially reduces relative to before closing recirculation (egr) valve, in other words lower than first threshold, just meet the feature of EGRC performance degradation, then can be concluded that this fault is EGRC performance degradation.
Step 305, when described first water temperature is higher than first threshold, then close the first recirculated water valve, after closing the first recirculated water valve, described second recirculated water carried out temperature detection, obtain the second water temperature.
Step 306, judge that described second water temperature is whether higher than Second Threshold, if lower than Second Threshold, enters step 307, otherwise enter step 309.
When the first water temperature is higher than first threshold, then illustrate that fault type is EGRC fault or the second water circulation component fault alternative one. But determine it is any fault, in addition it is also necessary to further judged by the water temperature Changing Pattern of the second recirculated water after closing the first recirculated water valve actually.
So using the second circulating water temperature of closing after the first recirculated water valve as the second water temperature in the present embodiment, and judge whether the second water temperature exists obvious decline with reference to Second Threshold.
Step 307, fault type is defined as recycle cooler fault.
After closing the first recirculated water valve, being decreased obviously occurs in the second water temperature, and lower than Second Threshold, then meets the feature of EGRC fault, so fault type is defined as recycle cooler fault.
Step 308, repeatedly switch the first recirculated water valve, and described second recirculated water is carried out temperature detection simultaneously, obtain the 3rd water temperature; If when opening the first circulating-water valve behind the door, the 3rd water temperature raises, and closes the first circulating-water valve behind the door, and the 3rd declines, then fault type is defined as recycle cooler fault.
In the present embodiment, for confirming that fault type is EGRC fault, further add the step repeatedly switching the first recirculated water valve. Based on the feature of EGRC fault, after opening the first recirculated water valve, the second circulating water temperature then increases, and after closing the first recirculated water valve, the second circulating water temperature then declines therewith.
In this step, by switching process repeatedly, dynamically the second circulating water temperature of change is as the 3rd water temperature, and judges whether the 3rd water temperature meets above water temperature Changing Pattern. If met, then can conclude more accurately, this fault necessarily EGRC fault, getting rid of the interference of accidentalia.
It is emphasized that described EGRC fault is specially the gas circuit leakage of recycle cooler.
Step 309, fault type is defined as the second water circulation component fault.
After closing the first recirculated water valve, significantly not changing occurs in the second water temperature, and still higher than described Second Threshold, then meets the feature of the second water circulation component fault, so fault type is defined as the second water circulation component fault.
Another specific embodiment of device of the present invention it is shown with reference to Fig. 4. Device described in the present embodiment is the entity apparatus realizing method described in embodiment illustrated in fig. 3. Associated description in embodiment illustrated in fig. 3 is equally applicable in the present embodiment, and described in the present embodiment, device specifically includes:
Controller, is used for cutting out recirculation (egr) valve, and cuts out the first recirculated water valve according to instruction.
First recirculated water valve, is used for controlling the first recirculated water and is turned on and off circulation; Described first recirculated water is the recirculated water of recirculating system.
Temperature sensor, for, after closing recirculation (egr) valve, carrying out temperature detection to the second recirculated water, obtain the first water temperature; After the first recirculated water valve closing, described second recirculated water is carried out temperature detection, obtains the second water temperature; Described second recirculated water is circulating water of engine.
Processor, is used for judging that whether described first water temperature is higher than first threshold, if it is the first recirculated water valve is closed in instruction; Judge that whether described second water temperature is higher than Second Threshold, if otherwise fault type being defined as recycle cooler fault.
Described temperature sensor is additionally operable to the temperature of gas after detection engine cool;
Then processor is additionally operable to;After judging described engine cool, whether the temperature of gas is higher than gas temperature threshold value, if gas temperature is higher than gas temperature threshold value, then controller described in instruction cuts out recirculation (egr) valve, otherwise it is assumed that described electromotor fault-free.
Described processor judges whether described first water temperature also includes higher than first threshold:
When described first water temperature is lower than first threshold, then fault type is defined as recycle cooler performance degradation.
Described processor judges whether described second water temperature also includes higher than Second Threshold:
When described second water temperature is higher than Second Threshold, then fault type being defined as the second water circulation component fault, described second water circulation component is the water circulation component in recirculating system.
Described controller is additionally operable to repeatedly switch the first recirculated water valve;
Then described temperature sensor is additionally operable to described second recirculated water to be carried out temperature detection, obtains the 3rd water temperature when the first recirculated water valve switchs repeatedly;
Then described processor is additionally operable to; Monitoring the 3rd water temperature, when opening the first circulating-water valve behind the door, the 3rd water temperature raises, and closes the first circulating-water valve behind the door, and the 3rd declines, then fault type is defined as recycle cooler fault;
Described recycle cooler fault is specially the gas circuit of recycle cooler and reveals.
As seen through the above technical solutions, illustrated embodiment existence in Fig. 3��4 provides the benefit that: by more complete water temperature judgment mechanism, conclude fault three kinds different accurately; And by repeatedly switching the first recirculated water valve, it is achieved conclude EGRC fault more accurately, eliminate the interference of accidentalia; Both examples above overall technical architecture is more complete, open more abundant.
Also, it should be noted the first threshold described in above example, Second Threshold, the 3rd threshold value and gas temperature threshold value are all arrange according to the actual operating mode of EGR engine.
The above is only the preferred embodiment of the present invention; it should be pointed out that, for those skilled in the art, under the premise without departing from the principles of the invention; can also making some improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (10)
1. the failure detector of an exhaust gas recirculation engines, it is characterised in that described device is that recirculation electromotor arranges the first recirculated water valve, specifically includes:
Controller, is used for cutting out recirculation (egr) valve, and cuts out the first recirculated water valve according to instruction;
First recirculated water valve, is used for controlling the first recirculated water and is turned on and off circulation; Described first recirculated water is the recirculated water of recirculating system;
Temperature sensor, for, after closing recirculation (egr) valve, carrying out temperature detection to the second recirculated water, obtain the first water temperature; After the first recirculated water valve closing, described second recirculated water is carried out temperature detection, obtains the second water temperature; Described second recirculated water is circulating water of engine;
Processor, is used for judging that whether described first water temperature is higher than first threshold, if it is the first recirculated water valve is closed in instruction; Judge that whether described second water temperature is higher than Second Threshold, if otherwise fault type being defined as recycle cooler fault.
2. device according to claim 1, it is characterised in that described temperature sensor is additionally operable to the temperature of gas after detection engine cool;
Then processor is additionally operable to judge that whether the temperature of gas is higher than gas temperature threshold value after described engine cool, if gas temperature is higher than gas temperature threshold value, then controller described in instruction cuts out recirculation (egr) valve, otherwise it is assumed that described electromotor fault-free.
3. device according to claim 1 or claim 2, it is characterised in that described processor judges whether described first water temperature also includes higher than first threshold:
When described first water temperature is lower than first threshold, then fault type is defined as recycle cooler performance degradation.
4. device according to claim 1 or claim 2, it is characterised in that described processor judges whether described second water temperature also includes higher than Second Threshold:
When described second water temperature is higher than Second Threshold, then fault type being defined as water circulation component fault, described water circulation component is the water circulation component of electromotor.
5. device according to claim 1 or claim 2, it is characterised in that described controller is additionally operable to repeatedly switch the first recirculated water valve;
Then described temperature sensor is additionally operable to described second recirculated water to be carried out temperature detection, obtains the 3rd water temperature when the first recirculated water valve switchs repeatedly;
Then described processor is additionally operable to monitoring the 3rd water temperature, and when opening the first circulating-water valve behind the door, the 3rd water temperature raises, and closes the first circulating-water valve behind the door, and fault type is then defined as recycle cooler fault by the 3rd water temperature drop;
Described recycle cooler fault is specially the gas circuit of recycle cooler and reveals.
6. the fault detection method of an exhaust gas recirculation engines, it is characterised in that described method is that recirculation electromotor arranges the first recirculated water valve, with control the first recirculated water be turned on and off circulation; Described first recirculated water is the recirculated water of recirculating system; Said method comprising the steps of:
After closing recirculation (egr) valve, the second recirculated water is carried out temperature detection and obtains the first water temperature, it is judged that whether described first water temperature is higher than first threshold; Described second recirculated water is circulating water of engine;
When described first water temperature is higher than first threshold, then close the first recirculated water valve, after closing the first recirculated water valve, described second recirculated water is carried out temperature detection, obtain the second water temperature;
Judge that whether described second water temperature is higher than Second Threshold; If described second water temperature is not higher than Second Threshold, then fault type is defined as recycle cooler fault.
7. method according to claim 6, it is characterised in that described closedown recirculation (egr) valve particularly as follows:
After judging described engine cool, whether the temperature of gas is higher than gas temperature threshold value, if gas temperature is higher than gas temperature threshold value, then closes recirculation (egr) valve, otherwise it is assumed that described electromotor fault-free.
8. method according to claim 6 or 7, it is characterised in that described method also includes:
When described first water temperature is lower than first threshold, then fault type is defined as recycle cooler performance degradation.
9. method according to claim 6 or 7, it is characterised in that described method also includes:
When described second water temperature is higher than Second Threshold, then fault type being defined as water circulation component fault, described water circulation component is the water circulation component of electromotor.
10. method according to claim 6 or 7, it is characterised in that the described recycle cooler fault that is defined as by fault type also includes:
Repeatedly switch the first recirculated water valve, and described second recirculated water is carried out temperature detection simultaneously, obtain the 3rd water temperature;
If when opening the first circulating-water valve behind the door, the 3rd water temperature raises, and closes the first circulating-water valve behind the door, and fault type is then defined as recycle cooler fault by the 3rd water temperature drop;
Described recycle cooler fault is specially the gas circuit of recycle cooler and reveals.
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| 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 |
| CN109975026B (en) * | 2019-03-29 | 2020-12-22 | 潍柴动力股份有限公司 | Engine fault monitoring method and related equipment |
| CN111219838B (en) * | 2019-11-19 | 2021-03-12 | 珠海格力电器股份有限公司 | Temperature controller and air conditioner matching method and device and temperature controller equipment |
| CN112380707A (en) * | 2020-11-18 | 2021-02-19 | 潍柴动力股份有限公司 | Method and device for evaluating cooling performance of EGR cooler and electronic equipment |
| CN115420505A (en) * | 2022-08-24 | 2022-12-02 | 东风汽车集团股份有限公司 | Test method and test device for exhaust gas recirculation system of engine |
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| FR2880067B1 (en) * | 2004-12-27 | 2007-02-16 | Valeo Thermique Moteur Sas | INSTALLATION FOR THERMAL CONTROL OF GASES ALLOWED IN AN ENGINE |
| SE529413C2 (en) * | 2005-12-21 | 2007-08-07 | Scania Cv Ab | Arrangement and method for recirculating exhaust gases of an internal combustion engine |
| SE530325C2 (en) * | 2006-09-29 | 2008-05-06 | Scania Cv Ab | cooler arrangement |
| US8267069B2 (en) * | 2009-08-25 | 2012-09-18 | International Engine Intellectual Property Company, Llc | EMG temp signal model based on EGRC out temp for EGR system anti-fouling protection |
| FR2954407B1 (en) * | 2009-12-22 | 2018-11-23 | Valeo Systemes De Controle Moteur | METHOD FOR CONTROLLING AN EGR CIRCUIT OF A MOTOR VEHICLE MOTOR, VALVE FOR IMPLEMENTING THE METHOD AND ENGINE WITH THE VALVE. |
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