CN102374001B - Ageing failure diagnosis method of engine catalytic converter - Google Patents
Ageing failure diagnosis method of engine catalytic converter Download PDFInfo
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- CN102374001B CN102374001B CN201010247329XA CN201010247329A CN102374001B CN 102374001 B CN102374001 B CN 102374001B CN 201010247329X A CN201010247329X A CN 201010247329XA CN 201010247329 A CN201010247329 A CN 201010247329A CN 102374001 B CN102374001 B CN 102374001B
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- 238000003745 diagnosis Methods 0.000 title claims abstract description 90
- 230000003197 catalytic effect Effects 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 48
- 230000032683 aging Effects 0.000 title abstract description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 83
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 83
- 239000001301 oxygen Substances 0.000 claims abstract description 83
- 238000012544 monitoring process Methods 0.000 claims abstract description 21
- 230000008569 process Effects 0.000 claims description 36
- 238000012937 correction Methods 0.000 claims description 24
- 239000003054 catalyst Substances 0.000 claims description 20
- 238000002405 diagnostic procedure Methods 0.000 claims description 17
- 238000011144 upstream manufacturing Methods 0.000 claims description 17
- 238000001914 filtration Methods 0.000 claims description 12
- 230000008859 change Effects 0.000 claims description 11
- 230000015556 catabolic process Effects 0.000 claims description 7
- 238000006731 degradation reaction Methods 0.000 claims description 7
- 239000000446 fuel Substances 0.000 description 29
- 230000004044 response Effects 0.000 description 12
- 238000007726 management method Methods 0.000 description 10
- 230000007704 transition Effects 0.000 description 6
- 239000000295 fuel oil Substances 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Exhaust Gas After Treatment (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The invention provides an ageing failure diagnosis method of an engine catalytic converter, which comprises the steps of: enabling condition judgment, first stage monitoring, second stage monitoring, oxygen storage time calculation, diagnosis judgment and failure diagnosis report, wherein the oxygen storage time calculation also comprises a special diagnosis mode, and can fully consider various conditions generated during the failure diagnosis; judgment conditions are more complete and full and can send related information to an OBD failure diagnosis unit under the condition of incapability of diagnosis so as to be convenient for accurately diagnosing the state of the catalytic converter and preventing from generating error judgment, such as incapability of carrying out failure diagnosis. By using the method, reasons of incapability of carrying out failure diagnosis can be known.
Description
Technical field
The present invention relates to the method for diagnosing faults of motor catalytic converter, particularly a kind of motor catalytic converter degradation failure diagnostic method that possesses On-Board Diagnostics (OBD) (OBD) function.
Background technique
In motor inline diagnosis (OBD) system, the proper functioning of the catalytic converter that the needs assurance is connected with engine exhaust pipe, when catalytic converter causes performance degradation because of long-term the use, when causing hydrocarbon (HC) content in the discharging to surpass emission limit 0.4g/km, OBD system beacon should be lighted, and record trouble information.
Usually, the diagnosis to catalytic converter deteriorate is based on the storage oxygen time (OSC) of detecting catalyst.As shown in Figure 1, when catalytic converter 10 was in normal working, the voltage output value of upstream oxygen sensor 261 is fluctuation up and down with the operating mode of motor, but the voltage output value of catalyst monitoring sensor 262 then is a straight line that voltage is close to zero substantially.
As shown in Figure 2, behind the performance degradation of catalytic converter 10, forfeiture oxygen storage capacity, catalyst monitoring sensor 262 also can produce the output voltage fluctuation that is similar to upstream oxygen sensor 261.Diagnosis to catalytic converter deteriorate can be surveyed the transformation efficiency at catalytic converter by detecting the oxygen storage capacity of catalytic converter.
Be to survey transformation efficiency at catalytic converter by the storage oxygen time of detecting catalytic converter to the principle of the diagnosis of catalytic converter deteriorate; And be by under idling operation, changing air fuel ratio (by rare to dense) to the detection of storage oxygen time, upstream and downstream lambda sensor response time that air fuel ratio is changed relatively, thus the information of catalytic converter oxygen storage capacity obtained.
Fig. 3 has shown a kind of typical catalytic converter diagnostic procedure, and wherein solid line is depicted as the voltage curve of output of upstream oxygen sensor, and dotted line is depicted as the curve of output of catalyst monitoring sensor.As shown in the figure, the diagnostic procedure of catalytic converter is divided into two stages, and the phase I is at first controlled air fuel ratio and carries out the transition to rare (15.6) gradually by reference value (14.6), records upstream oxygen sensor and catalyst monitoring sensor then respectively and changes rare response time.Second stage at first remains on air fuel ratio 15.6 regular hours, and then carries out the transition to dense (13.6) gradually, then notes upstream oxygen sensor and catalyst monitoring sensor respectively and changes the dense response time.Be when detecting that air fuel ratio is by rare thickening in the second stage to the principle of the diagnosis of catalytic converter deteriorate, relatively the upstream and downstream lambda sensor is to the response time of air fuel ratio variation, thereby obtain the information of catalytic converter oxygen storage capacity, survey the transformation efficiency of catalytic converter, judge whether catalytic converter exists fault.
Disclose a kind of diagnostic method of catalytic converter failures in the U. S. Patent 6694243, comprised in the diagnostic procedure therein starting diagnosis such as idling to enable the judgement of condition, but the object of judging has been limited; Only be to judge the catalytic converter proper functioning or have fault according to the output result in this method in addition, but can't find out and cause exporting abnormal reason, thereby influence the true and accurate of fault diagnosis result.
Summary of the invention
The purpose of this invention is to provide a kind of motor catalytic converter failures diagnostic method, the various situations that it produces in the time of taking into full account fault diagnosis, Rule of judgment more comprehensively fully, particularly when the unexpected deterioration of catalytic converter, diagnosis enters special pattern, employing is different from conventional diagnosis number of times and OSC filter factor, to OBD failure diagnosis unit generation relevant information, in order to diagnose out the state of catalytic converter more accurately, as carrying out fault diagnosis, utilize this method can also know the reason that to carry out fault diagnosis.
The invention provides a kind of motor catalytic converter failures diagnostic method, comprise in this method: enable condition criterion process, phase I observation process, second stage observation process, storage oxygen Time Calculation process, diagnosis deterministic process and report fault diagnosis result, also comprise particular diagnostic pattern deterministic process in storage oxygen Time Calculation process, it comprises the steps: to judge the correction value OSC of storage oxygen time
CWhether smaller or equal to particular diagnostic pattern trigger value OSC
T, and the last storage oxygen time filtering value OSC that calculates
TWith inferior calculating storage oxygen time correction value OSC
CDifference whether trigger limit value Δ OSC greater than the particular diagnostic pattern
TIf the correction value OSC of storage oxygen time
CSmaller or equal to particular diagnostic pattern trigger value OSC
T, or the last storage oxygen time filtering value OSC that calculates
TWith inferior calculating storage oxygen time correction value OSC
CDifference trigger limit value Δ OSC greater than the particular diagnostic pattern
T, then particular diagnostic mode enable set; Judge the minimum diagnosis number of times whether particular diagnostic pattern diagnosis number of times need be finished more than or equal to particular diagnostic; If the minimum diagnosis number of times that described particular diagnostic pattern diagnosis number of times need be finished more than or equal to particular diagnostic, then total diagnosis number of times zero clearing of particular diagnostic pattern; Though if the minimum diagnosis number of times that particular diagnostic pattern diagnosis number of times need be finished more than or equal to particular diagnostic, the correction value OSC of storage oxygen time
CGreater than particular diagnostic pattern trigger value OSC
T, or the last storage oxygen time filtering value OSC that calculates
TWith inferior calculating storage oxygen time correction value OSC
CDifference smaller or equal to the triggering limit value Δ OSC of particular diagnostic patterns of change amount
T, then flag bit zero clearing and withdraw from the particular diagnostic pattern; If the minimum diagnosis number of times that particular diagnostic pattern diagnosis number of times need be finished less than particular diagnostic, then total diagnosis number of times+1 of particular diagnostic pattern, and diagnosis number of times+1 of the particular diagnostic pattern of this circulation.
In a kind of schematic mode of execution of motor catalytic converter failures diagnostic method, OSC
C=OSC * OSC
AC* OSC
TCWherein: OSC
CBe the modification value of storage oxygen time, OSC
ACBe the air mass flow correction factor of storage oxygen time, OSC
TCBe the catalytic converter temperature correction factor of storage oxygen time, OSC=T
UpO-T
DownO, wherein, T
UpOBe the upset moment of upstream oxygen sensor, T
DownOBe these two upset moment of the upset moment of catalyst monitoring sensor.
In the another kind of schematically mode of execution of motor catalytic converter failures diagnostic method, comprise also that after the particular diagnostic pattern filtering of a storage oxygen time is calculated, i.e. OSC
F=(1-k
F) OSC
F+ k
F* OSC
CWherein: OSC
FBe OSC filter value, k
FBe filter factor.
The various situations that the present invention produces in the time of taking into full account fault diagnosis, particularly when the unexpected deterioration of catalytic converter, diagnosis enters special pattern, employing is different from conventional diagnosis number of times and OSC filter factor, to OBD failure diagnosis unit generation relevant information, in order to diagnose out the state of catalytic converter more accurately, as carrying out fault diagnosis, utilize method of the present invention can also know the reason that to carry out fault diagnosis.Because the working environment of motor is very complicated, might be because accidentalia causes the catalyst converter storage oxygen time less than normal, if think that accordingly catalyst converter is aging, then can bring extra economic burden to user vehicle in actual diagnostic procedure.Adopt method of the present invention, can guarantee above-mentioned erroneous judgement can not occur, improve the reliability of system diagnostics.
Description of drawings
The following drawings is only done the present invention and is schematically illustrated and explain, not delimit the scope of the invention.
When Fig. 1 is the catalytic converter proper functioning, the output schematic representation of upstream oxygen sensor and catalyst monitoring sensor.
Fig. 2 is after the catalytic converter deteriorate time, the output schematic representation of upstream oxygen sensor and catalyst monitoring sensor.
Fig. 3 is the curve of output when the upstream and downstream lambda sensor is worked in the motor catalytic converter.
Fig. 4 is a kind of schematic structured flowchart of motor catalytic converter failures diagnosis apparatus.
Fig. 5 A and Fig. 5 B are the schematic flow sheets of motor catalytic converter diagnostic procedure.
Fig. 6 is the schematic flow sheet of a kind of exemplary embodiment of particular diagnostic pattern.
Embodiment
Understand for technical characteristics, purpose and effect to invention have more clearly, now contrast description of drawings the specific embodiment of the present invention, identical label is represented identical part in each figure.
In another schematic mode of execution of the described motor catalytic converter failures of Fig. 4 diagnosis apparatus, comprise that an engine management unit 20, an aging diagnostic module 30 of catalytic converter that links to each other with engine management unit 20 are connected the OBD System Management Unit 40 of catalytic converter diagnostic module 30 and engine management unit 20 with one.
Wherein the sensor that links to each other with engine operating condition input unit 21 can comprise: suction pressure temperature transducer, throttle position sensor, cooling-water temperature sensor, catalytic converter temperature sensor, barometric pressure sensor and vehicle speed sensor etc.Valve EGR control unit 24 links to each other with Valve EGR, and Valve EGR is opened behind engine start, and activated carbon canister communicates with intake manifold, and fuel oil is inhaled into intake manifold and participates in burning after evaporated and purified.The lambda sensor that is arranged in the engine exhaust pipe is input to signal in the lambda sensor information input unit 26.Serial communication module 28 links to each other with OBD diagnostic module (not shown), the output control OBD fault indicating lamp of trouble light control unit 27.
Catalytic converter diagnostic module 30 comprises: one enables condition criterion part 32, and it links to each other with engine operating condition input unit 21, fuel oil closed loop status unit 22, air fuel ratio status unit 23 and Valve EGR control unit 24; An air fuel ratio is controlled and lambda sensor information gathering part 34, and it links to each other with lambda sensor input unit 26 with air fuel ratio information I/O unit 25; Judge part 36 with a storage oxygen time that links to each other with lambda sensor information gathering part 34 with air fuel ratio control.
Air fuel ratio control and lambda sensor information gathering part 34 comprise: phase I air fuel ratio control and lambda sensor information acquisition unit 341 and the control of second stage air fuel ratio and lambda sensor information acquisition unit 342, they link to each other with lambda sensor information input unit 26 with air fuel ratio information I/O unit respectively.Phase I wherein refers to that air fuel ratio by the thinning stage of reference value, carries out the transition to 15.6 as air fuel ratio by 14.6 gradually; Second stage refers to the stage that air-fuel ratio thickens, as air fuel ratio by 15.6 transition 13.6 gradually.
The storage oxygen time judges that part 36 comprises: time qualified unit 361 of storage oxygen, storage oxygen time calculating unit 362 and one is identifying unit 363 as a result, the output of identifying unit as a result links to each other with OBD System Management Unit 40, and then links to each other with trouble light control unit 27.
OBD System Management Unit 40 judges that with the storage oxygen time trouble light control unit 27 in part 36 and the engine management unit 20 links to each other.
Now describe the fault diagnosis flow scheme of motor catalytic converter in detail in conjunction with Fig. 5 A and Fig. 5 B.
The diagnostic process of motor catalytic converter mainly contains six processes: enable the condition criterion process, phase I observation process, second stage observation process, storage oxygen Time Calculation process, diagnosis deterministic process and report fault diagnosis result.
At first enter and enable the condition criterion process, determining step comprises: step S11 judges whether the air mass flow scope meets the requirements, step S12 judges whether motor is in whether fault that idling mode, step S13 judge whether to exist influences the catalytic converter diagnosis, other operating conditions that step S14 judges motor satisfy that diagnosis requires, step S15 judge satisfy the time stable after the above-mentioned condition whether long enough (such as 5 seconds), reach step S16 and judged whether to take place the operating mode that other needs withdraw from diagnosis.
For example, in a kind of concrete mode of execution: the air mass flow scope of judging among the step S11 is 0.5g/s-1.0g/s; The condition of the idling operation of judging among the step S12 is to get back to idling mode (throttle position is 0, the speed of a motor vehicle less than 2 kilometers/hour) from big air mass flow state (for example greater than 5g/s), and the time can not be long (for example can not above 20 seconds); The fault of judging among the step S13 that influences the catalytic converter diagnosis comprises the fault that is caused by CMPS Camshaft Position Sensor, cooling-water temperature sensor, crankshaft position sensor, spark coil, electronic throttle, oil-fired system, intake temperature, idling speed, nozzle, intake flow sensor, air inlet pressure sensor etc.; Other operating conditions of the motor of judging among the step S14 mainly comprise: motor is not in the failure diagnosis tool state of a control, air fuel ratio control is not in the process that returns to the preceding state of diagnosis, charge flow rate is 0.5g/s-1.0g/s, the duration of runs of motor is greater than 100s, throttle opening is less than 1.1%, coolant water temperature is in 70 ℃ to the 100 ℃ scopes, intake temperature is in 30 ℃ to 70 ℃ scopes, barometric pressure is greater than 70kpa, the speed of a motor vehicle is less than 2 kilometers/hour, gear is at P shelves or N shelves during automatic transmission case, fuel oil is in the closed loop control state, and the idling endurance is within 30 seconds; Judge among the step S15 whether the time that motor satisfies above-mentioned condition is more than the 5s; Judge among the step S16 that the operating mode that need withdraw from diagnosis for example comprises: the difference of engine speed and target idling is greater than 200 rev/mins, and significant variation has taken place the state of car load electrical equipment (as electronic fan, air-conditioning fan, automatic speed changing gear box etc.).
It will be understood by those skilled in the art that different and different according to vehicle and motor, more than the numerical value of every judgement also can be different.
If above-mentioned any one condition that enables does not satisfy, program enters step S60, reports fault diagnosis result to OBD; If above-mentioned terms and conditions all can satisfy, then program enters the phase I observation process.
In the phase I observation process, execution in step S22 at first, carry out phase I air fuel ratio control, be about to air fuel ratio and carry out the transition to rare (15.6) gradually by reference value (14.6), note upstream oxygen sensor and catalyst monitoring sensor then respectively and change rare response time, the regulation time that the phase I continued is the A part shown in Fig. 3, and the endurance of phase I is not less than a nominal time (for example 4 seconds).Execution in step S24 judges whether the phase I finish then.
Usually the lambda sensor response can produce two kinds of special circumstances: first kind is upstream oxygen sensor response time long (for example above 2 seconds), and flow process will change step S60 over to from step S24 this moment, reports diagnostic result and retreats out diagnostic routine; Another kind is catalyst monitoring sensor response time long (for example above 8 seconds), this moment, flow process was default maximum with the storage oxygen time assignment of catalyst monitoring sensor, flow process will be changeed step S60 from step S24 this moment, report the high conclusion of diagnosis catalytic converter oxygen storage capacity, control air fuel ratio then and get back to theoretical value 14.6 gradually, withdraw from diagnostic routine afterwards.In addition, monitoring is finished if step 24 is judged the phase I, and then program changes the step S32 shown in Fig. 5 B over to, enters the second stage observation process.
Shown in Fig. 5 B, program execution in step S32, carry out the control of second stage air fuel ratio, air fuel ratio was continued to remain on 15.6 regular hours, it is the B part shown in Fig. 3, and then carry out the transition to dense air fuel ratio 13.6 gradually, and noting the response time of upstream oxygen sensor and catalyst monitoring sensor respectively, execution in step S34 judges whether second stage (referring to Fig. 3) is finished then.
Identical with the situation of phase I, can produce two kinds of special circumstances in the response of second stage lambda sensor: first kind is upstream oxygen sensor response time long (for example above 2 seconds), flow process will change step S60 over to from step S34 this moment, report diagnostic result and retreat out diagnostic routine; Another kind is catalyst monitoring sensor response time long (for example above 8 seconds), this moment, flow process was default maximum with the storage oxygen time assignment of catalyst monitoring sensor, flow process will be changeed step S60 from step S34 this moment, report the high conclusion of diagnosis catalytic converter oxygen storage capacity, control air fuel ratio then and get back to theoretical value 14.6 gradually, withdraw from diagnostic routine afterwards.
In addition, monitoring is finished if step 34 is judged second stage, and then program enters storage oxygen Time Calculation process.
At step S42, program is calculated the original storage oxygen time (OSC), and wherein, the storage oxygen time is that second stage middle and upper reaches lambda sensor turn to the time that is continued when catalyst monitoring sensor overturns, be the time that oxygen that catalytic converter stores fully discharges, formula is: OSC=T
UpO-T
DownOWherein, T
UpOBe the upset moment of upstream oxygen sensor, T
DownOBe these two upset moment of the upset moment of catalyst monitoring sensor.
Execution in step S44 carries out the OSC correction value and calculates then, because the storage oxygen time can be subjected to the influence of idling air mass flow and catalytic converter temperature, therefore also needs according to different air mass flows and catalytic converter temperature the storage oxygen time to be revised.Formula is: OSC
C=OSC * OSC
AC* OSC
TCWherein: OSC
CBe revised storage oxygen time, OSC
ACBe the air mass flow correction factor of storage oxygen time, OSC
TCBe the catalytic converter temperature correction factor of storage oxygen time, and OSC
ACAnd OSC
TCBe two setting values, one is the number between 0 and 2, for example 1.1.
After finishing above-mentioned calculating, program enters step S462 to be judged, if this OSC
COSC than last time
CLittle a lot, then need execution in step S464 to carry out the particular diagnostic pattern.One judges this OSC
CBe significantly smaller than the OSC of last time
CCondition have two: the one, OSC
CValue is less than minimum limit value (for example being 1.5s); The 2nd, OSC
CThe triggering limit value (for example being 1s) of variable quantity.If this OSC
CNot than the OSC of last time
CLittle a lot, then directly change step S48 over to.
Step S464 is the particular diagnostic pattern, need enter the particular diagnostic pattern during the unexpected deterioration of catalytic converter, adopts to be different from conventional diagnosis number of times and OSC filter factor, to guarantee the reliability of diagnosis.At step S464, the storage oxygen time after the calculation of filtered also judges that to diagnostic result the flow process of particular diagnostic pattern will be illustrated in conjunction with Fig. 6 hereinafter.
The particular diagnostic pattern finishes back execution in step S48, carries out OSC filter value (OSC
F) calculate.
At step S48, the storage oxygen time result after the compensation is carried out filtering, calculate OSC
F, to overcome the otherness of different test results, formula is: OSC
F=(1-k
F) OSC
F+ k
F* OSC
CWherein: OSC
FBe OSC filter value, k
FBe filter factor, and twice filtering having certain time interval, for example is 10ms.
For example, in a kind of embodiment, quoted catalytic converter failures as if previous cycle, then filter factor k
FDesirable 0.2; If previous cycle is not quoted catalytic converter failures, then filter factor k
FDesirable 0.1; If this set of circulation particular diagnostic mode enable, then filter factor k
FDesirable 0.5.
Namely utilize the OSC of previous cycle
FValue and this circulation OSC
CValue was made amendment to the storage oxygen time, and assignment is to the OSC of this circulation
FValue, program enters the diagnosis deterministic process subsequently.
Execution in step S52 at first, analyzing and diagnosing result: if OSC
FBe lower than calibration value and then report FAIL, illustrate that there is fault in catalytic converter; Otherwise then report PASS, show that catalytic converter is working properly.Execution in step S54 reports to the OBD fault manage-ment cells with diagnostic result then.
In step S56, carry out the whether enough judgement of diagnosis number of times: if reach each required diagnosis number of times that carries out of car circulation time (one is 6 times), then enter step S60 and report fault diagnosis result, if do not meet the requirements of number of times then be back to the step S11 shown in Fig. 5 A, repeat diagnosis.
Figure 6 shows that a kind of schematic workflow of particular diagnostic pattern.As shown in the figure, behind execution in step S462, enter then execution in step S62 of particular diagnostic pattern if desired, judge whether following two conditions satisfy simultaneously, that is: the correction value OSC of storage oxygen time
CSmaller or equal to particular diagnostic pattern trigger value OSC
T, and the last storage oxygen time filtering value OSC that calculates
TWith inferior calculating storage oxygen time correction value OSC
CDifference trigger limit value Δ OSC greater than the particular diagnostic pattern
T
If above-mentioned condition is satisfied simultaneously, then program enters step S63, the set of particular diagnostic mode enable.
Subsequently, program enters step S64, judges the minimum diagnosis number of times whether special pattern diagnosis number of times need be finished more than or equal to particular diagnostic.
If the minimum diagnosis number of times that special pattern diagnosis number of times need be finished more than or equal to particular diagnostic, program enters step S66, with total diagnosis number of times zero clearing of particular diagnostic pattern; Though if the minimum diagnosis number of times that special pattern diagnosis number of times need be finished more than or equal to particular diagnostic, the correction value OSC of storage oxygen time
CGreater than particular diagnostic pattern trigger value OSC
T, or the last storage oxygen time filtering value OSC that calculates
TWith inferior calculating storage oxygen time correction value OSC
CDifference smaller or equal to the triggering limit value Δ OSC of particular diagnostic patterns of change amount
T, then program enters step S65, then flag bit zero clearing and withdraw from the particular diagnostic pattern; If the minimum diagnosis number of times that special pattern diagnosis number of times need be finished less than particular diagnostic, then program enters step S67: total diagnosis number of times+1 of particular diagnostic pattern, and diagnosis number of times+1 of the particular diagnostic pattern of this circulation.
After step S65, step S66 or step S67 end, program enters step S48.
For example, in embodiment, the minimum diagnosis number of times that particular diagnostic need be finished is 20 times, particular diagnostic pattern trigger value OSC
TBe 1 second, the triggering limit value Δ OSC of particular diagnostic patterns of change amount
TIt is 2 to 5 seconds.
In catalytic converter failures diagnostic method of the present invention, the OBD fault manage-ment cells not only can receive and store the final diagnosis Pass/Fail information of catalytic converter, can also receive and be stored in enable to find in condition criterion, phase I and the second stage observation process cause diagnosing the information that can't finish, phase I and second stage also can produce the control information to motor, particularly air fuel ratio control information.
Therefore, adopt method of the present invention can carry out the fault diagnosis of catalytic converter more accurately, all sidedly, avoid because of the interference of other faults to the catalytic converter diagnostic result.
In this article, " schematically " expression " is served as example, example or explanation ", any diagram, the mode of execution that is described to " schematically " in this article should be interpreted as a kind of preferred or have more the technological scheme of advantage.
Be to be understood that, though this specification is described according to each embodiment, but be not that each embodiment only comprises an independently technological scheme, this narrating mode of specification only is for clarity sake, those skilled in the art should make specification as a whole, technological scheme among each embodiment also can form other mode of executions that it will be appreciated by those skilled in the art that through appropriate combination.
Above listed a series of detailed description only is specifying at feasibility embodiment of the present invention; are they not usefulness? with restriction protection scope of the present invention, allly do not break away from equivalent embodiment or the change that skill spirit of the present invention does and to be included within protection scope of the present invention.
Claims (3)
1. motor catalytic converter degradation failure diagnostic method, comprise in this method: enable condition criterion process, phase I observation process, second stage observation process, storage oxygen Time Calculation process, diagnostic result analysis and diagnostic result number of times deterministic process and report fault diagnosis result, it is characterized in that, also comprise particular diagnostic pattern deterministic process in described storage oxygen Time Calculation process, described particular diagnostic pattern deterministic process comprises the steps:
Judge the correction value OSC of storage oxygen time
CWhether smaller or equal to particular diagnostic pattern trigger value OSC
T, and the last storage oxygen time filtering value OSC that calculates
FWith inferior calculating storage oxygen time correction value OSC
CDifference whether greater than the triggering limit value Δ OSC of particular diagnostic patterns of change amount
T
If the correction value OSC of described storage oxygen time
CSmaller or equal to particular diagnostic pattern trigger value OSC
T, or the last storage oxygen time filtering value OSC that calculates
FWith inferior calculating storage oxygen time correction value OSC
CDifference greater than the triggering limit value Δ OSC of particular diagnostic patterns of change amount
T, then particular diagnostic mode enable set;
Judge the minimum diagnosis number of times whether particular diagnostic pattern diagnosis number of times need be finished more than or equal to particular diagnostic;
If the minimum diagnosis number of times that described particular diagnostic pattern diagnosis number of times need be finished more than or equal to particular diagnostic, then total diagnosis number of times zero clearing of particular diagnostic pattern;
Though if the minimum diagnosis number of times that particular diagnostic pattern diagnosis number of times need be finished more than or equal to particular diagnostic, the correction value OSC of storage oxygen time
CGreater than particular diagnostic pattern trigger value OSC
T, or the last storage oxygen time filtering value OSC that calculates
FWith inferior calculating storage oxygen time correction value OSC
CDifference smaller or equal to the triggering limit value Δ OSC of particular diagnostic patterns of change amount
T, then flag bit zero clearing and withdraw from the particular diagnostic pattern;
If the minimum diagnosis number of times that particular diagnostic pattern diagnosis number of times need be finished less than particular diagnostic, then total diagnosis number of times+1 of particular diagnostic pattern, and diagnosis number of times+1 of the particular diagnostic pattern of this circulation.
2. motor catalytic converter degradation failure diagnostic method as claimed in claim 1, wherein:
OSC
C=OSC×OSC
AC×OSC
TC
Wherein:
OSC is the storage oxygen time of motor catalytic converter,
OSC
CBe the correction value of storage oxygen time,
OSC
ACBe the air mass flow correction factor of storage oxygen time,
OSC
TCBe the catalytic converter temperature correction factor of storage oxygen time,
OSC=T
UpO-T
DownO, wherein, T
UpOBe the upset moment of upstream oxygen sensor, T
DownOBe the upset moment of catalyst monitoring sensor.
3. motor catalytic converter degradation failure diagnostic method as claimed in claim 2 comprises also after described particular diagnostic pattern that wherein the filtering of a storage oxygen time is calculated, i.e. OSC
F=(1-k
F) OSC
F+ k
F* OSC
CWherein: OSC
FBe the OSC filter value,
k
FBe filter factor.
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