CN104594986A - Degradation diagnostic method for engine catalyst - Google Patents
Degradation diagnostic method for engine catalyst Download PDFInfo
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- CN104594986A CN104594986A CN201410707909.0A CN201410707909A CN104594986A CN 104594986 A CN104594986 A CN 104594986A CN 201410707909 A CN201410707909 A CN 201410707909A CN 104594986 A CN104594986 A CN 104594986A
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Abstract
The invention relates to the technical field of engines, in particular to a degradation diagnostic method for an engine catalyst. The degradation diagnostic method includes the following steps that the air inflow is increased under the premise that the air-fuel ratio controls a closed loop, and preparation is made for the diagnosis of the catalyst; oxygen in the catalyst is emptied, and a front oxygen sensor and a rear oxygen sensor of the catalyst become high-voltage signals; an engine gradually recovers to the optimal ignition state, the initial oxygen storing time OSC is obtained through a timer, and meanwhile the catalyst temperature and the engine load in the diagnosis process are stored; the initial oxygen storing time OSC is offset and filtered according to the catalyst temperature and the engine load in the diagnosis process, and the final oxygen storing time OSCFinal is obtained; the final oxygen storing time OSCFinal is compared with the threshold oxygen storing time OSCFinal limit, and the conclusion for judging whether the catalyst is degraded or not is obtained. The degradation diagnostic method is high in testing rate, stable and accurate in diagnostic result and small in emission influence.
Description
Technical field
The present invention relates to technical field of engines, particularly relate to a kind of motor catalyst converter deterioration diagnosis method.
Background technique
Ternary catalyzing unit is requisite important spare part in modern engine machine management system, be installed in automobile exhaust system, when its operating temperature reaches more than 300 °, under the catalysis of noble metal platinum, rhodium, palladium, the harmful gas generation redox chemistry reactions such as CO, HC, the NOx that automobile burning can be produced, be converted into CO2, H2O, N2, thus purifying automobile tail gas.Ternary catalyzing unit is the most effective way reducing discharge, if ternary catalyzing unit is deteriorated, then it can be caused not play catalytic conversion effect and affect discharge rising.Necessary testing catalytic device efficiency is required in " light-duty vehicle pollutant emission limit and method of measurement (state five) " emission standard, owing to being bound to increase discharge in catalyst converter efficiency test process, therefore seek a kind of efficient catalyst converter deterioration diagnosis method particularly important.
Summary of the invention
The object of the present invention is to provide a kind of motor catalyst converter deterioration diagnosis method.Its test rate is high, diagnostic result is stable accurately, discharge impact is little.
Technological scheme of the present invention is: a kind of motor catalyst converter deterioration diagnosis method, comprises the following steps:
Step 1: improve air inflow under the prerequisite of air-fuel ration control closed loop, for the diagnosis of catalyst converter is got ready;
Step 2: empty the oxygen in catalyst converter, makes the front lambda sensor of catalyst converter and post oxygen sensor all become high voltage signal;
Step 3: recover motor gradually to optimum igniting state, become by lambda sensor before timer record the time lag i.e. initial storage oxygen time OSC that low voltage signal to post oxygen sensor becomes low voltage signal, store catalyst temperature and engine load in diagnostic procedure simultaneously;
Step 4: according to the temperature of catalyst converter in diagnostic procedure and the load of motor, initial storage oxygen time OSC is compensated and filtering, finally stored up oxygen time OSC
final;
Step 5: will finally store up oxygen time OSC
finaloxygen time OSC is stored up with threshold value
faillimitcompare, draw the diagnosis whether catalyst converter is deteriorated;
Step 6: motor and catalyst converter are returned to normal working, diagnosis terminates.
Further, before carry out step 1, the rotating speed of motor, the aperture of accelerator pedal, the speed of a motor vehicle, air inflow need to keep stable.It is constant that the rotating speed, the aperture of accelerator pedal, the speed of a motor vehicle, the air inflow that refer to motor are stablized in described maintenance, or allow to change in positive and negative 5% scope of fixed value.
Further, in step 1, improving the mode of air inflow is: reduce the ignition effectiveness of motor gradually and increase the rotating speed desired value of engine idle.
Further, in step 2, the mode emptying oxygen in catalyst converter is: the ignition effectiveness of decline in the prerequisite of air-fuel ration control open loop low air fuel ratio and motor.
Further, in step 3, recover motor to optimum igniting state by the ignition effectiveness increasing air fuel ratio and motor.
Further, in step 3, when the timing time of described timer exceedes timing calibration value, stop diagnosis, show that catalyst converter does not have the diagnosis of deterioration simultaneously.
Further, in step 4, described final storage oxygen time OSC
finalobtained by following steps:
1. the catalyst converter mean temperature, according to saturated stage in oxygen uptake stage stored and motor mean load compensated the initial storage oxygen time, obtained revised storage oxygen time value OSC
norm: OSC
norm=OSC × f (Cat_T) × f (InletAir_dm)
Wherein, the temperature compensation factor that f (Cat_T) is catalyst temperature Cat_T, the charge flow rate compensating factor that f (InletAir_dm) is charge flow rate InletAir_dm;
2., to revised storage oxygen time value OSC
normcarry out filtering, finally stored up oxygen time OSC
final:
OSC
Final＝(1-EWMA)×OSC
Old+EWMA×OSC
Norm，
Wherein OSC
oldfor the storage oxygen time value that last catalyst converter is diagnosed, EWMA is filter factor.
Further, in step 5:
If described final storage oxygen time OSC
finalbe greater than threshold value storage oxygen time OSC
faillimit, show that catalyst converter is normal;
If described final storage oxygen time OSC
finalbe less than or equal to described threshold value storage oxygen time OSC
faillimit, show catalyst converter deterioration.
Further, in step 6: at the end of described diagnosis, described air fuel ratio is chemically correct fuel, and engine idle rotational desired value is normal idling speed desired value, and the air-fuel ration control of motor is closed loop mode.
Further, described threshold value storage oxygen time OSC
faillimitdemarcated by emission testing and obtain.
The invention has the beneficial effects as follows: the aperture of the rotating speed of motor, accelerator pedal, the speed of a motor vehicle, air inflow keep stable after carry out diagnosis preparation again, increase the reliability of diagnostic result.Before diagnosing, by improving air inflow and the speed accelerating to empty oxygen in catalyst converter, diagnostic procedure being completed in the short period of time, reduces the impact on environment in diagnostic procedure.According to the temperature of catalyst converter in diagnostic procedure and the load of motor, initial storage oxygen time OSC is compensated and filtering, finally to be stored up oxygen time OSC
final, make diagnostic result more accurate.And motor and catalyst converter are returned to normal working after terminating by diagnosis, the normal work of motor and catalyst converter can not be affected.
Accompanying drawing explanation
Fig. 1 is principle of the invention block diagram;
Fig. 2 is diagnostic procedure schematic diagram of the present invention;
Fig. 3 is that the present invention diagnoses major parameter sequential chart;
Fig. 4 is that the present invention initially stores up oxygen time OSC schematic diagram;
Embodiment
In order to make object of the present invention, technological scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.In addition, if below in described each mode of execution of the present invention involved technical characteristics do not form conflict each other and just can mutually combine.
As shown in Figure 1, the present invention gathers the front lambda sensor 2 at ternary catalyzing unit 1 two ends and the voltage signal of post oxygen sensor 4 by control unit ECU3, thus carries out the enforcement of whole diagnostic procedure.
As shown in Figure 2, diagnostic procedure of the present invention be divided into diagnosis the preparatory stage, empty oxygen stage, the saturated oxygen uptake stage and calculate evaluation stage.
For ensureing that diagnostic test results is accurately stable, before entering the diagnosis preparatory stage, need to possess certain conditions for diagnostics, as: judge that engine air-fuel ratio controls whether stablize closed loop, whether catalyst temperature is suitable, whether air inflow is normal and stable.Parameter in concrete conditions for diagnostics and conditions for diagnostics is different according to the difference of vehicle, and in embodiment provided by the present invention, conditions for diagnostics is as follows:
1) engine on time is more than 100s;
2) engine speed is between 600rpm and 1500rpm, and accelerator pedal aperture is less than 10%, the speed of a motor vehicle is less than 10km/h;
3) under motor is in stable closed loop mode;
4) catalyst temperature is between 400 DEG C and 900 DEG C;
5) charge flow rate is between 1g/s and 10g/s;
6) intake temperature is greater than 25 DEG C, and water temperature is between 50 DEG C and 120 DEG C;
7) the variance ratio situation of change of engine speed, accelerator pedal aperture, the speed of a motor vehicle, air inflow can not destroy the enable process of diagnosis;
8) relevant other sensor (lambda sensor, cam sensor, pedal position sensor, cooling-water temperature sensor, intake air temperature sensor, air inlet pressure sensor, vehicle speed sensor) is diagnosed to diagnose fault-free to catalyst converter;
9) operating mode is diagnosed to be that motor is in idling operation.
Meet these conditions (namely diagnosing enable condition) Shi Caineng and carrying out the diagnosis of catalyst converter, otherwise then do not carry out catalyzer diagnosis.After the enable condition of satisfied diagnosis, namely enter the diagnosis preparatory stage, diagnosis enabler flags position 1.First, under the prerequisite of air-fuel ration control closed loop, progressively reduce ignition effectiveness to certain value and increase rotating speed desired value a period of time of engine idle, to improve air inflow, carry out the preparation accelerated catalyst converter and diagnose in advance.
After carrying out the preparation of catalyst converter diagnosis, enter and empty oxygen stage.Now, air fuel ratio closed loop mark position 0, then while continuing to regulate engine combustion gasoline air mixture ratio to partially dense state namely to reduce air fuel ratio, continue to reduce ignition effectiveness by adjustment firing angle, accelerate the speed emptying oxygen.When the voltage signal of current lambda sensor and post oxygen sensor all becomes high voltage, empty oxygen stage and terminate, enter the saturated oxygen uptake stage.
Saturated oxygen uptake stage need air fuel ratio to the skew of chemically correct fuel partially rare direction a certain amount of namely air fuel ratio starts to be greater than chemically correct fuel time, ignition effectiveness is increased by adjustment firing angle, slowly to return to Best Point state, make oxygen fully effectively by catalyst converter, for catalyzer diagnosis end rear engine recovery optimum igniting state is ready.In the process, control unit ECU3 stores the temperature of catalyst converter and the load of motor in diagnostic procedure, simultaneously, the timer of control unit ECU3 inside starts timing when oxygen sensor voltage signal becomes low voltage in the past, until stop timing when post oxygen sensor voltage signal also becomes low voltage, then the time of timer record is initial storage oxygen time OSC, as shown in Figure 4, initial storage oxygen time OSC is in saturated oxygen uptake phase process, before, post oxygen sensor voltage signal all becomes time lag during low voltage, after initially being stored up oxygen time OSC value, the saturated oxygen uptake stage terminates.If this process Timer timing time exceedes the calibration value of timer, then show that catalyst converter catalytic capability is very good, then stop diagnosis.
Enter after the saturated oxygen uptake stage terminates and calculate evaluation stage, this stage first ignition effectiveness is returned to gradually catalyst converter diagnosis before normal value, be convenient to catalyst converter diagnosis and terminate rear engine and return to normal control unit EMS and control.Meanwhile, the catalyst converter mean temperature that control unit ECU stored according to the saturated stage in oxygen uptake stage and motor mean load compensated the initial storage oxygen time, obtained revised storage oxygen time value OSC
norm, its formula is as follows:
OSC
Norm＝OSC×f(Cat_T)×f(InletAir_dm)
Wherein, f (Cat_T) temperature compensation factor that is catalyst temperature Cat_T; The compensating factor that f (InletAir_dm) is the charge flow rate of charge flow rate InletAir_dm.
Guarantee air inflow is constant, engine load was changed before vehicle idling, thus the temperature of catalyst converter in change diagnostic procedure, carry out organizing test under different catalyst temperature more, temperature compensation factor under wherein one group of catalyst temperature is set as 1, draw catalyst converter storage oxygen time value at such a temperature, because the objective catalytic capability (namely storing up the oxygen time) of same catalyst converter is certain, again with the storage oxygen time value at this temperature for reference value, the storage oxygen time value obtained at other temperature is carried out reference value normalized by temperature compensation factor (i.e. temperature correction correction factor), thus under drawing air inflow permanence condition, different temperature compensation factor (temperature correction correction factor) during different catalyst temperature, namely temperature compensation factor f (Cat_T) of the present invention obtains according to the temperature of test.
Equally, keep catalyst temperature constant, by carrying out organizing test under motor various inlet flow more, throughput compensating factor under wherein one group of catalyst converter throughput is set as 1, draw the storage oxygen time value of catalyst converter under this throughput, because the objective catalytic capability (namely storing up the oxygen time) of same catalyst converter is certain, again with the storage oxygen time value under this throughput for reference value, the storage oxygen time value obtained under other throughputs is carried out reference value normalized by charge flow rate compensating factor (i.e. throughput compensating approach coefficient), thus under drawing temperature-resistant condition, different throughput compensating factor (throughput compensating approach coefficient) charge flow rate compensating factor f (InletAir_dm) of the present invention during different catalyst converter throughput can obtain according to the size of charge flow rate during test.Because the temperature of catalyst converter and charge flow rate are all the factors affecting test result, therefore needing to adopt temperature compensation factor f (Cat_T) and charge flow rate compensating factor f (InletAir_dm) to compensate when the oxygen time, OSC revised to initial storage simultaneously.
Obtaining revised storage oxygen time value OSC
normafter carry out filtering again, what obtain is final storage oxygen time OSC
final, its formula is as follows:
OSC
Final＝(1-EWMA)×OSC
Old+EWMA×OSC
Norm，
Wherein OSC
finalfor final storage oxygen time value, OSC
oldfor the storage oxygen time value that last catalyst converter is diagnosed, EWMA is filter factor.
Draw final storage oxygen time OSC
finalafter, will finally store up oxygen time OSC
finaloxygen time OSC is stored up with threshold value
faillimit(threshold value storage oxygen time OSC
faillimitdemarcated by emission testing and obtain) compare:
If final storage oxygen time OSC
finalexceed threshold value storage oxygen time OSC
faillimit, show that catalyzer is normal;
If final storage oxygen time OSC
finalbe less than or equal to described threshold value storage oxygen time OSC
faillimit, show catalyst degradation.
After drawing diagnosis, described air fuel ratio is returned to chemically correct fuel gradually, the idling speed desired value of motor returns to normal idling speed desired value, diagnosis enabler flags position 0, and air fuel ratio closed loop mark position 1, diagnosis so far terminates.
The above, be only the specific embodiment of the present invention, it should be pointed out that any those of ordinary skill in the art are in the technical scope disclosed by the present invention, the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.
Claims (10)
1. a motor catalyst converter deterioration diagnosis method, is characterized in that, comprises the following steps:
Step 1: improve air inflow under the prerequisite of air-fuel ration control closed loop, for the diagnosis of catalyst converter is got ready;
Step 2: empty the oxygen in catalyst converter, makes the front lambda sensor of catalyst converter and post oxygen sensor all become high voltage signal;
Step 3: recover motor gradually to optimum igniting state, become by lambda sensor before timer record the time lag i.e. initial storage oxygen time OSC that low voltage signal to post oxygen sensor becomes low voltage signal, store catalyst temperature and engine load in diagnostic procedure simultaneously;
Step 4: according to the temperature of catalyst converter in diagnostic procedure and the load of motor, initial storage oxygen time OSC is compensated and filtering, finally stored up oxygen time OSC
final;
Step 5: will finally store up oxygen time OSC
finaloxygen time OSC is stored up with threshold value
faillimitcompare, draw the diagnosis whether catalyst converter is deteriorated;
Step 6: motor and catalyst converter are returned to normal working, diagnosis terminates.
2. a kind of motor catalyst converter deterioration diagnosis method as claimed in claim 1, is characterized in that: before carry out step 1, and the rotating speed of motor, the aperture of accelerator pedal, the speed of a motor vehicle, air inflow need to keep stable.
3. a kind of motor catalyst converter deterioration diagnosis method as claimed in claim 1, is characterized in that, in step 1, improving the mode of air inflow is: reduce the ignition effectiveness of motor gradually and increase the rotating speed desired value of engine idle.
4. a kind of motor catalyst converter deterioration diagnosis method as claimed in claim 1, is characterized in that, in step 2, the mode emptying oxygen in catalyst converter is: the ignition effectiveness of decline in the prerequisite of air-fuel ration control open loop low air fuel ratio and motor.
5. a kind of motor catalyst converter deterioration diagnosis method as claimed in claim 1, is characterized in that: in step 3, recovers motor to optimum igniting state by the ignition effectiveness increasing air fuel ratio and motor.
6. a kind of motor catalyst converter deterioration diagnosis method as claimed in claim 1, is characterized in that: in step 3, when the timing time of described timer exceedes timing calibration value, stops diagnosis, show that catalyst converter does not have the diagnosis of deterioration simultaneously.
7. a kind of motor catalyst converter deterioration diagnosis method as claimed in claim 1, is characterized in that, in step 4, and described final storage oxygen time OSC
finalobtained by following steps:
1. the catalyst converter mean temperature, according to saturated stage in oxygen uptake stage stored and motor mean load compensated the initial storage oxygen time, obtained revised storage oxygen time value OSC
norm: OSC
norm=OSC × f (Cat_T) × f (InletAir_dm)
Wherein, the temperature compensation factor that f (Cat_T) is catalyst temperature Cat_T, the charge flow rate compensating factor that f (InletAir_dm) is charge flow rate InletAir_dm;
2., to revised storage oxygen time value OSC
normcarry out filtering, finally stored up oxygen time OSC
final:
OSC
Final＝(1-EWMA)×OSC
Old+EWMA×OSC
Norm，
Wherein OSC
oldfor the storage oxygen time value that last catalyst converter is diagnosed, EWMA is filter factor.
8. a kind of motor catalyst converter deterioration diagnosis method as claimed in claim 1, is characterized in that, in step 5:
If described final storage oxygen time OSC
finalbe greater than threshold value storage oxygen time OSC
faillimit, show that catalyst converter is normal;
If described final storage oxygen time OSC
finalbe less than or equal to described threshold value storage oxygen time OSC
faillimit, show catalyst converter deterioration.
9. a kind of motor catalyst converter deterioration diagnosis method as claimed in claim 1, it is characterized in that, in step 6: at the end of described diagnosis, described air fuel ratio is chemically correct fuel, engine idle rotational desired value is normal idling speed desired value, and the air-fuel ration control of motor is closed loop mode.
10. a kind of motor catalyst converter deterioration diagnosis method as claimed in claim 8, is characterized in that: described threshold value storage oxygen time OSC
faillimitdemarcated by emission testing and obtain.
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| CN114776422B (en) * | 2022-05-10 | 2024-04-16 | 潍柴动力股份有限公司 | Three-way catalyst aging diagnosis method and device and computer readable storage medium thereof |
| CN114961954A (en) * | 2022-06-16 | 2022-08-30 | 东风汽车集团股份有限公司 | Fault detection method for post-catalyst oxygen sensor |
| CN114961954B (en) * | 2022-06-16 | 2023-04-28 | 东风汽车集团股份有限公司 | Method for detecting fault of oxygen sensor behind catalyst |
| CN115075927A (en) * | 2022-06-22 | 2022-09-20 | 东风汽车集团股份有限公司 | Degradation diagnosis method for hybrid vehicle type engine catalyst |
| CN115075927B (en) * | 2022-06-22 | 2023-05-23 | 东风汽车集团股份有限公司 | Mixed motor vehicle type engine catalyst degradation diagnosis method |
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