CN109372618A - Automobile-used broad domain oxygen sensor failure monitor method - Google Patents

Automobile-used broad domain oxygen sensor failure monitor method Download PDF

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Publication number
CN109372618A
CN109372618A CN201811485628.XA CN201811485628A CN109372618A CN 109372618 A CN109372618 A CN 109372618A CN 201811485628 A CN201811485628 A CN 201811485628A CN 109372618 A CN109372618 A CN 109372618A
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diff
dilute
dense
oxygen sensor
broad domain
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CN201811485628.XA
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CN109372618B (en
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秦龙
王俊鹏
王恺
赵芳勋
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Dongfeng Motor Corp
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Dongfeng Motor Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • F01N11/007—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring oxygen or air concentration downstream of the exhaust apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • 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

Abstract

The invention discloses a kind of automobile-used broad domain oxygen sensor failure monitor methods, broad domain oxygen sensor failure monitor includes the dense monitoring sluggish to dilute response and dilute monitoring sluggish to dense response in exhaust system, monitoring process includes failure initial phase, loitering phase, compensate Offset time calculation stages, lags in response Delay time calculation stages, end reaction time calculation stages, failure monitor evaluation stage.The present invention can fast and accurately realize automobile-used broad domain oxygen sensor failure monitor.

Description

Automobile-used broad domain oxygen sensor failure monitor method
Technical field
The present invention relates to technical field of engine control, in particular to a kind of automobile-used broad domain oxygen sensor failure monitor side Method.
Background technique
It is clearly proposed in " light-duty vehicle pollutant emission limit and measurement method (Chinese 6th stage) " and preceding oxygen is passed The diagnosis requirement of sensor: lambda sensor is (for firing before OBD (On-Board Diagnostic, onboard diagnostic system) system is coped with The sensor of oil control, traditional switching mode lambda sensor and/or wide area or general purpose transducer) failure be monitored, monitor Content includes output voltage, the speed of response and the parameter that may influence discharge.
Broad domain oxygen sensor (switching mode oxygen is not particularly suited for for the Diagnostic Strategy of switching mode lambda sensor in the prior art Sensor can only qualitatively read the content of air in exhaust, and broad domain oxygen sensor can accurately read air in exhaust and contain Amount, more can accurately carry out Combustion System).Broad domain oxygen sensor can be exported accurately compared with traditional switch type lambda sensor The signal of air-fuel ratio needs to carry out failure monitor for broad domain oxygen sensor.The existing monitoring to broad domain oxygen sensor is By the way that target air-fuel ratio is arranged, oscillation is forced, actively monitoring is belonged to, discharge is will cause and increases.
Summary of the invention
Present invention aim to provide a kind of monitoring method of broad domain oxygen sensor failure, this method can be to wide area oxygen The failure state of sensor is accurately monitored.
In order to achieve this, a kind of automobile-used broad domain oxygen sensor failure monitor method, feature designed by the present invention exist In: broad domain oxygen sensor failure monitor includes the dense monitoring sluggish to dilute response in exhaust system, described dense sluggish to dilute response Monitoring refer to engine management system (EMS, Engine Management System) request oil-break when, monitoring oxygen sensing Reaction time of the fuel oil in discharge gas that device really reflects from dense to dilute；
The monitoring of response sluggishness of the fuel oil from dense to dilute in discharge gas, includes the following steps:
Step 1: initializing the monitoring signals of broad domain oxygen sensor；
Step 2: the request of engine oil-break is waited, until Targeted fuel equivalent proportion FEQR≤0.01 in exhaust pipe, and it is wide Practical fuel oil equivalent proportion FEQR > 0.9 in the exhaust pipe that domain oxygen sensor reflects, then enter step 3；
Step 3: obtaining continuing for the practical fuel oil equivalent proportion FEQR > 0.9 in the exhaust pipe that broad domain oxygen sensor reflects Time t_OffsetR2L；
Step 4: obtaining the practical fuel oil equivalent proportion FEQR in the exhaust pipe that broad domain oxygen sensor reflects from 0.9 to 0.3 Duration t_DelayR2L；
Step 5: if duration t_OffsetR2LIn addition duration t_DelayR2LLess than 1 second, or when lasting Between t_OffsetR2LWith duration t_DelayR2LDuring the entire process of enter engine cylinder in mean air entry amount dm_AirAvg ≤ 0.01 or exhaust pipe in practical fuel oil equivalent proportion FEQR maximum value < 1, then terminate the monitoring of whole process；It will continue Time t_OffsetR2LWith duration t_DelayR2LIt is added and obtains fuel oil in final discharge gas from dense to dilute when reaction Between t_MeasuredR2L；
And according in duration t_OffsetR2LWith duration t_DelayR2LDuring the entire process of enter engine cylinder Interior mean air entry amount dm_AirAvg obtains time limit value t_LimitR2L:
Wherein, p0、p1And p2For fuel oil from dense to dilute during mean air entry magnitude relation formula in time limit value and engine cylinder Three calibration coefficients, p0, p1And p2Occurrence demarcate to obtain by emission test；
By t_MeasuredR2LSubtract time limit value t_LimitR2LObtain time difference t_DiffR2L, time difference t_DiffR2L Whether fail from dense to dilute for evaluating the fuel oil in discharge gas.
Step 6: calculating the time difference t_Diff of continuous n+1 driving cycleR2L, and array is formed, it adjusts n+1 times continuous The time difference of driving cycle is arranged from small to large, obtains t_DiffR2L(0,1,...n)；N=0,1,2...
If n is odd number, t_Diff is takenR2L(0,1 ... the average value of two values in centre in n) is as current first The dense dilute reaction time begun is poor:
WhereinWithFor array t_DiffR2L(0,1 ... in n)WithThe time value of position；
If n is even number, t_Diff is takenR2L(0,1 ... the median in n) is the time difference as initial evaluation:
WhereinFor array t_DiffR2L(0,1 ... in n) TheThe time value of position；
The dense dilute reaction time finally evaluated for n-th (N=1,2,3 ...) is poor, and (n-th, which is finally evaluated, refers to n-th Calculate continuous n+1 times time difference), it is characterized with following formula:
t_DiffR2LFinal(N)=
kR2L×(t_DiffR2LNormal(N)-t_DiffR2LRestored(N-1))+t_DiffR2LRestored(N-1)
Wherein, kR2LIt is 0.195 for filter factor, is obtained according to discharge calibration；t_DiffR2LRestored(N-1) under vehicle Dense dilute reaction time difference data t_Diff of electricity storageR2LFinal(N-1), i.e., have after electricity under vehicle:
t_DiffR2LRestored(N-1)=t_DiffR2LFinal(N-1)
t_DiffR2LFinal(N) indicate n-th calculate continuous n+1 times final evaluation time it is poor；
t_DiffR2LNormal(N) indicate that n-th calculates continuous n+1 times initial evaluation time difference
Particularly, for engine management system offline for the first time, the numerical value for having a default is stored in t_ DiffR2LRestored(0) in；
Each t_DiffR2LRestoredThe dense number to dilute response failure monitor of fuel oil when update, in discharge gas CntR2LDiagAdd 1；
By preceding N of the vehicle after offlineR2LThe failure evaluation that secondary n times calculate weeds out, and guarantees the stability of data: i.e. in N < NR2LWhen, do not do failure evaluation；In N >=NR2LWhen, if t_DiffR2LFinal(N) > t_DiffR2LLimit, then show wide area oxygen Sensor is dense sluggish to dilute response, fails；If t_DiffR2LFinal(N)≤t_DiffR2LLimit, show that wide area oxygen senses Device is dense normal to dilute response, does not fail, wherein t_DiffR2LLimitIt is preset dense to the sluggish calibration limit value of dilute response.
The fuel oil in discharge gas is carried out while the monitoring of response sluggishness of the fuel oil from dense to dilute in discharge gas Sluggish monitoring is responded from dilute to dense, the sluggish monitoring of response of the fuel oil in the discharge gas from dilute to dense, including such as Lower step:
Step 101: initializing the monitoring signals of broad domain oxygen sensor；
Step 102: obtaining the duration t_Fuelcut of engine oil-breakL2R, when the Targeted fuel equivalent in exhaust pipe It is greater than 1 than FEQR, practical fuel oil equivalent proportion FEQR≤0.01 in the exhaust pipe that broad domain oxygen sensor reflects, and the oil-break time t_FuelcutL2RWhen more than 2 seconds, 103 are entered step；
Step 103: when obtaining the practical fuel oil equivalent proportion FEQR≤0.3 in the exhaust pipe that broad domain oxygen sensor reflects Duration t_OffsetL2R；
Step 104: obtain practical fuel oil equivalent proportion FEQR in the exhaust pipe that broad domain oxygen sensor reflects from 0.3 to 0.9 duration t_DelayL2R；
Step 105: if duration t_OffsetL2RWith duration t_DelayL2RDuring the entire process of enter start Mean air entry amount dm_AirAvg > 12g/s or mean engine revolving speed n_EngAvg > 2000rpm in machine cylinder, then monitor Data it is meaningless, terminate the monitoring of whole process；By duration t_OffsetL2RIn addition duration t_DelayL2RIt obtains Fuel oil in the final discharge gas reaction time t_Measured from dilute to denseL2R:
And according to duration t_OffsetL2RWith duration t_DelayL2RDuring the entire process of enter engine cylinder in Mean air entry amount dm_AirAvg obtains time limit value t_LimitL2R:
t_LimitL2R=p5×dm_AirAvg2+p4×dm_AirAvg+p3
Wherein, p3, p4And p5For fuel oil from dilute to dense during mean air entry magnitude relation in time limit value and engine cylinder Three calibration coefficients of formula, p3、p4And p5Occurrence according to discharge calibration obtain；
By actual measurement from dilute to dense reaction time t_MeasuredL2RSubtract limit value t_LimitL2RObtain time difference t_ DiffL2R, t_DiffL2RWhether fail from dilute to dense for evaluating the fuel oil in discharge gas.
Step 106: calculating the time difference t_Diff of continuous n+1 driving cycleL2R, and array is formed, adjust continuous n+1 The time difference of secondary driving cycle is arranged from small to large, obtains t_DiffL2R(0,1,...n)；N=0,1,2...
Take t_DiffL2R(0,1 ... the average value of two values in centre in n) is poor as current dilute dense reaction time:
Wherein,WithFor array t_DiffL2R(0,1 ... in n)WithThe time value of position；
If n is even number, t_Diff is takenL2R(0,1 ... the median in n) is the time difference as evaluation:
WhereinFor array t_DiffL2R(0,1 ... in n) The time value of position；
The dense dilute reaction time finally evaluated for n-th (N=1,2,3 ...) is poor, and (n-th, which is finally evaluated, refers to n-th Calculate continuous n+1 times time difference), it is characterized with following formula:
t_DiffL2RFinal(N)=
kL2R×(t_DiffL2RNormal(N)-t_DiffL2RRestored(N-1))+t_DiffL2RRestored(N-1)
Wherein,
kL2RIt is 0.195 for filter factor, is obtained according to discharge calibration；t_DiffL2RRestored(N-1) it is deposited for electricity under vehicle Dilute dense reaction time difference data t_Diff of storageL2RFinal(N-1), i.e., have after electricity under vehicle:
t_DiffL2RRestored(N-1)=t_DiffL2RFinal(N-1)
t_DiffL2RRestored(N) indicate n-th calculate continuous n+1 times final evaluation time it is poor；
t_DiffL2RNormal(N) indicate that n-th calculates continuous n+1 times initial evaluation time difference
Particularly, for engine management system offline for the first time, the numerical value for having a default is stored in t_ DiffL2RRestored(0) in；
Each t_DiffL2RRestoredThe dilute number to dense response failure monitor of fuel oil when update, in discharge gas CntL2RDiagAdd 1；
By the preceding N after vehicle is offlineL2RSecondary n times evaluation failure evaluation can weed out, and guarantee the stability of data: i.e. In N < NL2RWhen, do not do failure evaluation；In N >=NL2RWhen, if t_DiffL2RFinal(N) > t_DiffL2RLimit, then show width Domain oxygen sensor is dense sluggish to dilute response, fails；If t_DiffL2RFinal(N)≤t_DiffL2RLimit, show wide area oxygen Sensor is dense normal to dilute response, does not fail, wherein t_DiffL2RLimitIt is preset dilute to the sluggish calibration limit of dense response Value.
The present invention can failure state to broad domain oxygen sensor (fuel oil in discharge gas is from dense to dilute and in discharge gas Fuel oil from dilute to dense) accurately monitored.
Effect of the present invention can quick and precisely monitor whether lambda sensor fails.The corresponding prior art is all strong before diagnosis System changes the normal air-fuel ratio of engine, and normal control strategy is all to select optimal air-fuel ratio as far as possible to guarantee to arrange It puts.But if active forcibly changing air-fuel ratio, it will certainly allow air-fuel ratio not in optimal state, discharge and oil consumption can all rise It is high.
The present invention by further theory analysis and a large amount of test job, find vehicle oil-break and restore fuel feeding when It waits, by the above method, whether can be failed with accurate measurements lambda sensor, and vehicle all can when deceleration or brake Oil-break is carried out, revolving speed reduces to a certain extent after oil-break, will restore fuel feeding, this is very common operating condition, without actively controlling Air-fuel ratio processed.
Detailed description of the invention
The dense failure monitor flow chart sluggish to dilute response of Fig. 1 this patent broad domain oxygen sensor；
The dilute failure monitor flow chart sluggish to dense response of Fig. 2 this patent broad domain oxygen sensor.
Specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
Automobile-used broad domain oxygen sensor failure monitor method according to the present invention, broad domain oxygen sensor failure monitor include row The dense monitoring sluggish to dilute response in gas system, the dense monitoring sluggish to dilute response refers to requests in engine management system When oil-break, reaction time of the fuel oil in discharge gas that monitoring lambda sensor really reflects from dense to dilute；
The monitoring of response sluggishness of the fuel oil from dense to dilute in discharge gas, as shown in Figure 1, including the following steps:
Step 1: failure initial phase initializes the monitoring signals of broad domain oxygen sensor；
Step 2: loitering phase, wait engine oil-break request, until the Targeted fuel equivalent proportion FEQR in exhaust pipe≤ 0.01, and the practical fuel oil equivalent proportion FEQR > 0.9 in the exhaust pipe that reflects of broad domain oxygen sensor, then enter step 3；
Step 3: compensation Offset time calculation stages obtain the practical combustion in the exhaust pipe that broad domain oxygen sensor reflects The duration t_Offset of oil equivalent ratio FEQR > 0.9R2L；Particularly, if in calculating process, there is target FEQR > 0.01, then terminate the monitoring of whole process；
Step 4: lags in response Delay time calculation stages obtain the reality in the exhaust pipe that broad domain oxygen sensor reflects Duration t_Delay of the border fuel oil equivalent proportion FEQR from 0.9 to 0.3R2L；Particularly, if in calculating process, there is mesh FEQR > 0.01 is marked, then terminates the monitoring of whole process.If practical FEQR is greater than last FEQR in calculating process, The monitoring for then terminating whole process arrives dilute reaction time calculation stages into finally dense in practical FEQR < 0.3；
Step 5: it is final dense to dilute reaction time calculation stages, if duration t_OffsetR2LIn addition duration t_ DelayR2LLess than 1 second, or in duration t_OffsetR2LWith duration t_DelayR2LDuring the entire process of enter hair Practical fuel oil equivalent proportion FEQR maximum value < 1 in engine cylinder in mean air entry amount dm_AirAvg≤0.01 or exhaust pipe, The data of monitoring are meaningless, then terminate the monitoring of whole process；By duration t_OffsetR2LWith duration t_DelayR2L Addition obtains the reaction time t_Measured from dense to dilute of the fuel oil in final discharge gasR2L；
t_MeasuredR2L=t_OffsetR2L+t_DelayR2L
And according in duration t_OffsetR2LWith duration t_DelayR2LDuring the entire process of enter engine cylinder Interior mean air entry amount dm_AirAvg obtains time limit value t_LimitR2L:
Wherein, p0、p1And p2For fuel oil from dense to dilute during mean air entry magnitude relation formula in time limit value and engine cylinder Three calibration coefficients, p0, p1And p2Occurrence demarcate to obtain by emission test；
By t_MeasuredR2LSubtract time limit value t_LimitR2LObtain time difference t_DiffR2L, time difference t_DiffR2L Whether fail from dense to dilute for evaluating the fuel oil in discharge gas；
t_DiffR2L=t_MeasuredR2L-t_LimitR2L；
In each driving cycle of engine under the conditions of meeting failure monitor, a failure monitor assessment is at most completed；
Step 6: calculating the time difference t_Diff of continuous 5 driving cyclesR2L, and array is formed, adjust continuous 5 driving The time difference of circulation is arranged from small to large, obtains initial t_DiffR2L(0,1,...5)。
Take t_DiffR2L(0,1 ... 5) average value of two values in centre in is poor as current dense dilute reaction time:
Wherein t_DiffR2L(2) and t_DiffR2LIt (3) is array t_DiffR2L(0,1 ... 5) the 2nd and 3 time value in；
Dense dilute reaction time for finally evaluating is poor, per calculated value of continuous 5 times updates, carries out table with following formula Sign:
t_DiffR2LFinal=kR2L×(t_DiffR2LNormal-t_DiffR2LRestored)+t_DiffR2LRestored
Wherein, kR2LIt (is obtained by discharge calibration, 0.195) the present embodiment takes for filter factor；t_DiffR2LRestoredFor The data being electronically stored in EEPROM under vehicle are not easy to wipe, i.e., have after electricity under vehicle:
t_DiffR2LRestored=t_DiffR2LFinal *
t_DiffR2LFinal *The dense dilute reaction time finally evaluated for last continuous 5 driving cycles is poor
Particularly, for engine management system offline for the first time, the numerical value (1200ms) for having a default is stored in t_DiffR2LRestoredIn, which obtains according to OBD discharge calibration；
Each t_DiffR2LRestoredWhen update (every time after lower electricity, storage value can all update if there is a change), gas is discharged The dense times N to dilute response failure monitor of fuel oil in body adds 1 (lower electricity storage value variation will+1)；Times N is similarly vehicle Under be electronically stored at data in EEPROM, be not easy to wipe；
In order to guarantee the accuracy of failure monitor, by preceding N of the vehicle after offlineR2L=5 N failure evaluations weed out, and protect Demonstrate,prove the stability of data: i.e. in N < NR2LWhen=5, failure evaluation is not done；In N >=NR2LWhen=5, if t_DiffR2LFinal(N) > t_DiffR2LLimit, then show that broad domain oxygen sensor is dense sluggish to dilute response, fail；If t_DiffR2LFinal(N)≤ t_DiffR2LLimit, show that broad domain oxygen sensor is dense normal to dilute response, do not fail, wherein t_DiffR2LLimitIt is default It is dense to the sluggish calibration limit value of dilute response (1200ms passes through discharge calibration acquisition).
Fuel oil being arranged while responding sluggish monitoring from dense to dilute in above-mentioned technical proposal, in discharge gas Fuel oil in deflation body responds sluggish monitoring from dilute to dense, and response of the fuel oil from dilute to dense in the discharge gas is sluggish Monitoring, as shown in Fig. 2, including the following steps:
Step 101: failure initialization initializes the monitoring signals of broad domain oxygen sensor；
Step 102: loitering phase, obtain engine oil-break (Targeted fuel equivalent proportion FEQR i.e. in exhaust pipe close to 0) duration t_FuelcutL2R, when the Targeted fuel equivalent proportion FEQR in exhaust pipe is greater than 1, broad domain oxygen sensor reflects Practical fuel oil equivalent proportion FEQR≤0.01 in exhaust pipe out, and oil-break time t_FuelcutL2RWhen more than 2 seconds, indicate dilute It is relatively stable to dense failure monitor process, enter step 103；
Step 103: compensation Offset time calculation stages obtain the reality in the exhaust pipe that broad domain oxygen sensor reflects Duration t_Offset when fuel oil equivalent proportion FEQR≤0.3L2R；Particularly, if in calculating process, there is target FEQR then terminates the monitoring of whole process less than 1；
Step 104: lags in response Delay time calculation stages obtain in the exhaust pipe that broad domain oxygen sensor reflects Duration t_Delay of the practical fuel oil equivalent proportion FEQR from 0.3 (excessively dilute limit value) to 0.9 (overrich limit value)L2R, in reality FEQR enters step 105 when being greater than overrich limit value 0.9；If practical FEQR is less than last FEQR, then in calculating process Terminate the monitoring of whole process.When practical FEQR is greater than overrich limit value 0.9, calculating of dense reaction time rank is arrived into finally dilute Section；
Step 105: it is final dense to dilute reaction time calculation stages, if duration t_OffsetL2RWith duration t_ DelayL2RDuring the entire process of enter engine cylinder in mean air entry amount dm_AirAvg > 12g/s or mean engine turn Fast n_EngAvg > 2000rpm, then the data monitored are meaningless, terminate the monitoring of whole process；By duration t_ OffsetL2RIn addition duration t_DelayL2RObtain the reaction time t_ from dilute to dense of the fuel oil in final discharge gas MeasuredL2R；
t_MeasuredL2R=t_OffsetL2R+t_DelayL2R
And according to duration t_OffsetL2RWith duration t_DelayL2RDuring the entire process of enter engine cylinder in Mean air entry amount dm_AirAvg obtains time limit value t_LimitL2R:
t_LimitL2R=p5×dm_AirAvg2+p4×dm_AirAvg+p3
Wherein, p3, p4And p5For fuel oil from dilute to dense during mean air entry magnitude relation in time limit value and engine cylinder Three calibration coefficients of formula, p3、p4And p5Occurrence according to discharge calibration obtain；
By actual measurement from dilute to dense reaction time t_MeasuredL2RSubtract limit value t_LimitL2RObtain time difference t_ DiffL2R, t_DiffL2RWhether fail from dilute to dense for evaluating the fuel oil in discharge gas.
Step 106: calculating the time difference t_Diff of continuous 5 driving cyclesL2R, and array is formed, it adjusts continuous 5 times and drives The time difference for sailing circulation is arranged from small to large, obtains final t_DiffL2R(0,1,...5)；
Take t_DiffL2R(0,1 ... 5) average value of two values in centre in is poor as current dense dilute reaction time:
Wherein, t_DiffL2R(2) and t_DiffL2R(3) For array t_DiffL2R(0,1 ... 5) the 2nd and 3 time value in；
Dense dilute reaction time for finally evaluating is poor, per calculated value of continuous 5 times updates, carries out table with following formula Sign:
t_DiffL2RFinal=kL2R×(t_DiffL2RNormal-t_DiffL2RRestored)+t_DiffL2RRestored
Wherein, kL2RFor filter factor (0.195)；t_DiffL2RRestoredIt is dense dilute in EEPROM to be electronically stored under vehicle Reaction time difference data has after electricity under vehicle:
t_DiffL2RRestored=t_DiffL2RFinal *
t_DiffL2RFinal *The dilute dense reaction time finally evaluated for last continuous 5 driving cycles is poor.
Particularly, for engine management system offline for the first time, the numerical value for having a default is stored in t_ DiffL2RRestoredIn, which obtains 1200ms according to OBD discharge calibration；
Each t_DiffL2RRestoredThe dilute number to dense response failure monitor of fuel oil when update, in discharge gas CntL2RDiagAdd 1, number CntL2RDiagThe data being electronically stored in EEPROM under vehicle are similarly, are not easy to wipe；
By the preceding N after vehicle is offlineL2R=5 N failure evaluations can weed out, and guarantee the stability of data: i.e. in N < NL2RWhen=5, failure evaluation is not done；In N >=NL2RWhen=5, if t_DiffL2RFinal(N) > t_DiffL2RLimit, then show Broad domain oxygen sensor is dense sluggish to dilute response, fails；If t_DiffL2RFinal(N)≤t_DiffL2RLimit, show wide area Lambda sensor is dense normal to dilute response, does not fail, wherein t_DiffL2RLimitIt is preset dilute to the sluggish calibration limit of dense response It is worth (1200ms).
In above-mentioned technical proposal, automobile-used broad domain oxygen sensor failure monitor needs while meeting following working condition:
The range of speeds of engine speed is in 500rpm~3000rpm；And the relevant crankshaft signal diagnosis of engine speed Fault-free is diagnosed with cam signal；
Lambda sensor heating is completed, i.e. lambda sensor is in normal working temperature, and lambda sensor heating diagnosis nothing Failure occurs；
Gas pedal aperture is 0%~80%, and accelerator open degree sensor diagnoses fault-free；
Engine coolant temperature is more than 50 DEG C, and cooling temperature sensor diagnostic fault-free occurs；
Motor intake manifold temperature is more than 20 DEG C, and intake manifold temperature sensor diagnoses fault-free；
Engine on time is more than 90s；
Air inflow in air inlet cylinder in 1g/s~17g/s, and for monitor or calculate air inflow dependent diagnostic (such as into Gas manifold pressure, air throttle dependent failure etc.) fault-free generation；
Speed is more than 15km/h, and speed is relevant diagnoses fault-free.
In above-mentioned technical proposal, needed for meeting in automobile-used broad domain oxygen sensor failure monitor after working condition, then allow into The failure monitor for entering broad domain oxygen sensor needs to meet following operating condition simultaneously steady during broad domain oxygen sensor failure monitor Fixed condition: the revolving speed of engine fluctuation in ± 100rpm；The fluctuation in ± 5% of gas pedal aperture；Speed is in ± 5km/h Fluctuation；The fluctuation in ± 4g/s into the air inflow in cylinder；
In the either step of broad domain oxygen sensor failure monitor, it is unsatisfactory for if there is the above working condition any one Or stable conditions condition any one be unsatisfactory for, then terminates monitoring, re-enter is lost after the satisfaction of working condition next time Effect monitoring.
In above-mentioned technical proposal, control system includes engine management system EMS, broad domain oxygen sensor intelligent drives chip And broad domain oxygen sensor.
Broad domain oxygen sensor is used to provide in current combustion heel row tracheae oxygen concentration in exhaust to engine management system EMS Signal；
The oxygen concentration signal acquisition process that broad domain oxygen sensor intelligent drives chip monitors broad domain oxygen sensor, conversion For air-fuel ratio coherent signal, and broad domain oxygen sensor is heated, guarantees that lambda sensor works at a normal temperature；
Engine management system EMS believes according to air-fuel ratio correlation in broad domain oxygen sensor intelligent chip treated exhaust pipe Number, air-fuel ratio in engine cylinder is adjusted by control Engine Injection Mass, injection timing etc..
Oxygen concentration is too low in exhaust pipe, referred to as " overrich "；Oxygen concentration is excessively high in exhaust pipe, referred to as " excessively dilute "；
The calculation method of practical fuel oil equivalent proportion FEQR in exhaust pipe are as follows:
Broad domain oxygen sensor provides the concentration of current exhaust air in tube to engine management system EMS, uses excessive sky The inverse of gas coefficient lambda, i.e. fuel oil equivalent proportion FEQR are characterized:
Then have, when FEQR is 0, engine oil-break, when FEQR is greater than 1, fuel concentration overrich in discharge gas, FEQR is small When 1, the fuel concentration in discharge gas is excessively dilute, when FEQR is equal to 1, is currently at ideal air-fuel ratio (14.3).
In above-mentioned technical proposal, the p0、p1And p2Value be respectively -79.12,3527.1 and 0.The p3、p4And p5's Value is respectively 4540.7, -1109.5 and 77.4.
The content that this specification is not described in detail belongs to the prior art well known to professional and technical personnel in the field.

Claims (9)

1. a kind of automobile-used broad domain oxygen sensor failure monitor method, it is characterised in that: broad domain oxygen sensor failure monitor includes row The dense monitoring sluggish to dilute response in gas system, the dense monitoring sluggish to dilute response refers to requests in engine management system When oil-break, reaction time of the fuel oil in discharge gas that monitoring lambda sensor really reflects from dense to dilute；
The monitoring of response sluggishness of the fuel oil from dense to dilute in discharge gas, includes the following steps:
Step 1: initializing the monitoring signals of broad domain oxygen sensor；
Step 2: the request of engine oil-break is waited, until Targeted fuel equivalent proportion FEQR≤0.01 in exhaust pipe, and wide area oxygen Practical fuel oil equivalent proportion FEQR > 0.9 in the exhaust pipe that sensor reflects, then enter step 3；
Step 3: obtaining the duration of the practical fuel oil equivalent proportion FEQR > 0.9 in the exhaust pipe that broad domain oxygen sensor reflects t_OffsetR2L；
Step 4: obtaining practical fuel oil equivalent proportion FEQR the holding from 0.9 to 0.3 in the exhaust pipe that broad domain oxygen sensor reflects Continuous time t_DelayR2L；
Step 5: if duration t_OffsetR2LIn addition duration t_DelayR2LLess than 1 second, or in duration t_ OffsetR2LWith duration t_DelayR2LDuring the entire process of enter engine cylinder in mean air entry amount dm_AirAvg≤ 0.01 or exhaust pipe in practical fuel oil equivalent proportion FEQR maximum value < 1, then terminate the monitoring of whole process；When will continue Between t_OffsetR2LWith duration t_DelayR2LAddition obtains the reaction time from dense to dilute of the fuel oil in final discharge gas t_MeasuredR2L；
And according in duration t_OffsetR2LWith duration t_DelayR2LDuring the entire process of enter engine cylinder in put down Equal air inflow dm_AirAvg obtains time limit value t_LimitR2L:
Wherein, p0、p1And p2For fuel oil from dense to dilute during in time limit value and engine cylinder mean air entry magnitude relation formula three A calibration coefficient, p0, p1And p2Occurrence demarcate to obtain by emission test；
By t_MeasuredR2LSubtract time limit value t_LimitR2LObtain time difference t_DiffR2L, time difference t_DiffR2LFor Whether the fuel oil in evaluation discharge gas fails from dense to dilute.
2. automobile-used broad domain oxygen sensor failure monitor method according to claim 1, it is characterised in that:
Step 6: calculating the time difference t_Diff of continuous n+1 driving cycleR2L, and array is formed, adjust continuous n+1 driving The time difference of circulation is arranged from small to large, obtains initial t_DiffR2L(0,1,...n)；
If n is odd number, t_Diff is takenR2L(0,1 ... the average value of two values in centre in n) is as currently dense dilute Reaction time is poor:
WhereinWithFor array t_DiffR2L(0,1 ... in n)WithThe time value of position；
If n is even number, t_Diff is takenR2L(0,1 ... the median in n) is the time difference as evaluation:
WhereinFor array t_DiffR2L(0,1 ... in n)Position Time value；
For n-th, N=1,2,3 ..., the dense dilute reaction time finally evaluated is poor, and n-th, which is finally evaluated, refers to that n-th calculates It the continuous n+1 time difference, is characterized with following formula:
t_DiffR2LFinal(N)=
kR2L×(t_DiffR2LNormal(N)-t_DiffR2LRestored(N-1))+t_DiffR2LRestored(N-1)
Wherein, kR2LFor filter factor, obtained according to discharge calibration；t_DiffR2LRestored(N-1) it is stored for electricity under vehicle dense Dilute reaction time difference data t_DiffR2LFinal(N-1), i.e., have after electricity under vehicle:
t_DiffR2LRestored(N-1)=t_DiffR2LFinal(N-1)
t_DiffR2LFinal(N) indicate n-th calculate continuous n+1 times final evaluation time it is poor；
t_DiffR2LNormal(N) indicate that n-th calculates continuous n+1 times initial evaluation time difference；
Each t_DiffR2LRestoredThe dense number Cnt to dilute response failure monitor of fuel oil when update, in discharge gasR2LDiag Add 1；
By preceding N of the vehicle after offlineR2LSecondary N failure evaluation weeds out, and guarantees the stability of data: i.e. in N < NR2LWhen, it does not do Failure evaluation；In N >=NR2LWhen, if t_DiffR2LFinal(N) > t_DiffR2LLimit, then show that broad domain oxygen sensor is dense to dilute Response is sluggish, fails；If t_DiffR2LFinal(N)≤t_DiffR2LLimit, show that broad domain oxygen sensor is dense to dilute response Normally, it does not fail, wherein t_DiffR2LLimitIt is preset dense to the sluggish calibration limit value of dilute response.
3. automobile-used broad domain oxygen sensor failure monitor method according to claim 1, it is characterised in that: in discharge gas Response of the fuel oil from dense to dilute sluggish monitoring while to carry out response of the fuel oil from dilute to dense in discharge gas sluggish It monitors, the sluggish monitoring of response of the fuel oil in the discharge gas from dilute to dense includes the following steps:
Step 101: initializing the monitoring signals of broad domain oxygen sensor；
Step 102: obtaining the duration t_Fuelcut of engine oil-breakL2R, when the Targeted fuel equivalent proportion in exhaust pipe FEQR is greater than 1, practical fuel oil equivalent proportion FEQR≤0.01 in the exhaust pipe that broad domain oxygen sensor reflects, and oil-break time t_ FuelcutL2RWhen more than 2 seconds, 103 are entered step；
Step 103: continuing when obtaining the practical fuel oil equivalent proportion FEQR≤0.3 in the exhaust pipe that broad domain oxygen sensor reflects Time t_OffsetL2R；
Step 104: obtaining practical fuel oil equivalent proportion FEQR in the exhaust pipe that broad domain oxygen sensor reflects from 0.3 to 0.9 Duration t_DelayL2R；
Step 105: if duration t_OffsetL2RWith duration t_DelayL2RDuring the entire process of enter engine cylinder Interior mean air entry amount dm_AirAvg > 12g/s or mean engine revolving speed n_EngAvg > 2000rpm, the then number monitored According to meaningless, the monitoring of whole process is terminated；By duration t_OffsetL2RIn addition duration t_DelayL2RIt obtains final Discharge gas in fuel oil from dilute to dense reaction time t_MeasuredL2R:
And according to duration t_OffsetL2RWith duration t_DelayL2RDuring the entire process of enter it is average in engine cylinder Air inflow dm_AirAvg obtains time limit value t_LimitL2R:
t_LimitL2R=p5×dm_AirAvg2+p4×dm_AirAvg+p3,
Wherein, p3, p4And p5For fuel oil from dilute to dense during mean air entry magnitude relation formula in time limit value and engine cylinder Three calibration coefficients, p3、p4And p5Occurrence according to discharge calibration obtain；
By actual measurement from dilute to dense reaction time t_MeasuredL2RSubtract limit value t_LimitL2RObtain time difference t_DiffL2R, t_DiffL2RWhether fail from dilute to dense for evaluating the fuel oil in discharge gas.
4. automobile-used broad domain oxygen sensor failure monitor method according to claim 3, it is characterised in that: step 106: calculating The time difference t_Diff of continuous n+1 driving cycleL2R, and form array, adjust time difference of continuous n+1 driving cycle from It is small to being arranged greatly, obtain initial t_DiffL2R(0,1,...n)；
Take t_DiffL2R(0,1 ... the average value of two values in centre in n) is poor as current dense dilute reaction time:
Wherein,WithFor array t_DiffL2R(0,1 ... in n)WithThe time value of position；
If n is even number, t_Diff is takenL2R(0,1 ... the median in n) is the time difference as evaluation:
WhereinFor array t_DiffL2R(0,1 ... in n)Position Time value；
For n-th, N=1,2,3 ..., the dense dilute reaction time finally evaluated is poor, and n-th, which is finally evaluated, refers to that n-th calculates It the continuous n+1 time difference, is characterized with following formula:
t_DiffL2RFinal(N)=
kL2R×(t_DiffL2RNormal(N)-t_DiffL2RRestored(N-1))+t_DiffL2RRestored(N-1)
Wherein,
kL2RFor filter factor, obtained according to discharge calibration；t_DiffL2RRestoredIt (N-1) is dilute dense reaction of electricity storage under vehicle Time difference data t_DiffL2RFinal(N-1), i.e., have after electricity under vehicle:
t_DiffL2RRestored(N-1)=t_DiffL2RFinal(N-1)
t_DiffL2RRestored(N) indicate n-th calculate continuous n+1 times final evaluation time it is poor；
t_DiffL2RNormal(N) indicate that n-th calculates continuous n+1 times initial evaluation time difference；
Each t_DiffL2RRestoredThe dilute number Cnt to dense response failure monitor of fuel oil when update, in discharge gasL2RDiag Add 1；
By the preceding N after vehicle is offlineL2RSecondary N failure evaluation can weed out, and guarantee the stability of data: i.e. in N < NL2RWhen, Do not do failure evaluation；In N >=NL2RWhen, if t_DiffL2RFinal(N) > t_DiffL2RLimit, then show that broad domain oxygen sensor is dense It is sluggish to dilute response, it fails；If t_DiffL2RFinal(N)≤t_DiffL2RLimit, show that broad domain oxygen sensor is dense to dilute Response is normal, does not fail, wherein t_DiffL2RLimitIt is preset dilute to the sluggish calibration limit value of dense response.
5. automobile-used broad domain oxygen sensor failure monitor method according to claim 1, it is characterised in that: automobile-used wide area oxygen passes Sensor failure monitor needs while meeting following working condition:
The range of speeds of engine speed is in 500rpm~3000rpm；The relevant crankshaft signal diagnosis of engine speed and cam Signal diagnoses fault-free；
Lambda sensor heating is completed, and lambda sensor heating diagnoses fault-free；
For gas pedal aperture 0%~80%, accelerator open degree sensor diagnoses fault-free；
Engine coolant temperature is more than 50 DEG C, and cooling temperature sensor diagnostic fault-free occurs；
Motor intake manifold temperature is more than 20 DEG C, and intake manifold temperature sensor diagnoses fault-free；
Engine on time is more than 90s；
Air inflow in air inlet cylinder is in 1g/s~17g/s；
Speed is more than 15km/h.
6. automobile-used broad domain oxygen sensor failure monitor method according to claim 5, it is characterised in that: in automobile-used wide area oxygen After working condition needed for sensor failure monitoring meets, then the failure monitor of broad domain oxygen sensor is allowed access into, is passed in wide area oxygen During sensor failure monitor, need to meet simultaneously following stable conditions condition: the revolving speed of engine fluctuation in ± 100rpm； The fluctuation in ± 5% of gas pedal aperture；Speed fluctuation in ± 5km/h；Into the air inflow in cylinder in ± 4g/s wave It is dynamic；
In the either step of broad domain oxygen sensor failure monitor, be unsatisfactory for if there is the above working condition any one or Stable conditions condition any one is unsatisfactory for, then terminates monitoring.
7. automobile-used broad domain oxygen sensor failure monitor method according to claim 1, it is characterised in that: the reality in exhaust pipe The calculation method of border fuel oil equivalent proportion FEQR are as follows:
Broad domain oxygen sensor provides the concentration of current exhaust air in tube to engine management system EMS, uses excess air system The inverse of number λ, i.e. fuel oil equivalent proportion FEQR are characterized:
Then have, when FEQR is 0, engine oil-break, when FEQR is greater than 1, fuel concentration overrich in discharge gas, FEQR is less than 1 When, the fuel concentration in discharge gas is excessively dilute, when FEQR is equal to 1, is currently at ideal air-fuel ratio.
8. automobile-used broad domain oxygen sensor failure monitor method according to claim 1, it is characterised in that: the p0、p1And p2 Value be respectively -79.12,3527.1 and 0.
9. automobile-used broad domain oxygen sensor failure monitor method according to claim 3, it is characterised in that: the p3、p4And p5 Value be respectively 4540.7, -1109.5 and 77.4.
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