CN106996341A - A kind of diagnostic method of broad domain oxygen sensor response failure - Google Patents
A kind of diagnostic method of broad domain oxygen sensor response failure Download PDFInfo
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- CN106996341A CN106996341A CN201710189380.1A CN201710189380A CN106996341A CN 106996341 A CN106996341 A CN 106996341A CN 201710189380 A CN201710189380 A CN 201710189380A CN 106996341 A CN106996341 A CN 106996341A
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- 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
- F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
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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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- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The invention discloses a kind of diagnostic method of broad domain oxygen sensor response failure, belong to vehicular field.The diagnostic method includes：Target air-fuel ratio and set-point value are set；Judge whether target air-fuel ratio changes；Calculate respectively measured value from dense to dilute and dilute measured value and desired value to dense process reaction time difference, calculate the difference of the measured value and the measured value of change start time to the business of first absolute value of integration and the difference of the measured value of the desired value and change start time in the reaction time to the second absolute value of the integration in the reaction time；Difference is handled, business is compared with level threshold value respectively with the difference after processing, so as to be diagnosed to be speed of response failure mode.The diagnostic method of the present invention, by setting set-point value, calculate respectively from dense to dilute and dilute to above-mentioned difference and business and contrast standard threshold values during dense, can effectively distinguish broad domain oxygen sensor and carry out the fault mode of speed of response failure, and calculate the delay degree of the speed of response.
Description
Technical field
The present invention relates to vehicular field, more particularly to a kind of diagnostic method of broad domain oxygen sensor response failure.
Background technology
《Light-duty vehicle pollutant emission limit and measuring method (Chinese 6th stage)》In clearly propose to preceding oxygen pass
The diagnosis requirement of the dynamic response of sensor：" lambda sensor (is used for the sensor that fuel oil is controlled, traditional opens before OBD system reply
Pass type sensor and/or wide area or general purpose transducer) failure be monitored, Contents for Monitoring include output voltage, the speed of response
With the parameter that may influence to discharge ".
The Diagnostic Strategy failed in the prior art for vehicle oxygen sensor is mainly for switching mode lambda sensor, but pin
Broad domain oxygen sensor is not suitable for the Diagnostic Strategy of switching mode lambda sensor.Simultaneously for examining that broad domain oxygen sensor fails
It is disconnected, diagnosed in the market just for asymmetric peak response Delay failure pattern.
Therefore, broad domain oxygen sensor in the market can not carry out efficient diagnosis to other speed of response failure modes,
The requirement of state six and OBDII regulations can not be met.
The content of the invention
It is an object of the present invention to provide a kind of diagnostic method of broad domain oxygen sensor response failure, width can be effectively distinguished
The fault mode of domain oxygen sensor speed of response failure, and calculate the delay degree of the speed of response.
Especially, the invention provides a kind of diagnostic method of broad domain oxygen sensor response failure, for being diagnosed to be wide area
The speed of response failure mode of lambda sensor, comprises the following steps：
Setting procedure：Target air-fuel ratio and set-point value are set, wherein, the set-point value is according to the response of lambda sensor
Transmission function set；
Judge whether target air-fuel ratio changes；
Calculation procedure：When target air-fuel ratio changes, first process of the measured value from less than 1 to more than 1 is calculated,
The difference in the reaction time of measured value and desired value is calculated, the measured value and the measurement of change start time is calculated
The difference of value to the first absolute value of the integration in the reaction time, calculate the desired value and change start time measured value it
Difference calculates the business of first absolute value and second absolute value to the second absolute value of the integration in the reaction time,
Second process of the measured value from more than 1 to less than 1 is calculated, is repeated the above steps,
Wherein, the measured value is the ratio of the actual mixing ratio and chemically correct fuel measured by the broad domain oxygen sensor
Value, the desired value is the ratio that expected air-fuel ratio and the chemically correct fuel are calculated according to fuel injection parameter, the reaction
Time be the measured value or the desired value since change to the time for reaching the set-point value；
Comparison step：Handle the difference, by the difference after the business of the integration and processing respectively with level threshold value
It is compared, so as to be diagnosed to be the speed of response failure mode of lambda sensor.
Further, average and filter step is also included before the comparison step, is to first process and institute
The second process is stated repeatedly to be calculated, and the business for obtaining the difference and the integration to repeatedly calculating is averaged and filtered,
And judge whether calculation times are enough, if so, into comparison step, otherwise returning to previous step.
Further, the set-point value is set according to the single order step response functions of the response of lambda sensor.
Further, the processing described in the comparison step refers to calculate very first time parameter and the second time parameter,
Wherein, the very first time parameter be the difference obtained by first process and second process are calculated and, it is described
Second time parameter is the poor absolute value of first process and the difference obtained by second process calculating；
The business of the integration include first process calculate obtained by the first business and second process calculate gained the
Two business.
Further, the speed of response failure mode include asymmetric peak operating lag, it is dense to dilute peak response delay,
It is dilute to rich-spike value operating lag, symmetrically pass through operating lag, dense pass through operating lag to dilute and dilute to dense pass through operating lag.
Further, the level threshold value includes the first threshold that broad domain oxygen sensor symmetrically passes through operating lag failure
A1, Second Threshold A2, the broad domain oxygen sensor of broad domain oxygen sensor asymmetric peak operating lag failure asymmetric pass through response and prolonged
3rd threshold value of slow failure, the 4th threshold value of the asymmetric peak value operating lag failure of broad domain oxygen sensor, under the different delays time
Pass through the first integral threshold value of operating lag failure and under the different delays time peak response delay fault second integral threshold value.
Further, it is less than institute when the very first time parameter is not less than the first threshold, second time parameter
The half of first threshold is stated, while when first business is respectively less than the first integral threshold value with the second business, diagnosing the wide area
Lambda sensor is symmetrically to pass through operating lag failure mode；
When the very first time parameter not less than the Second Threshold, second time parameter less than the Second Threshold
Half, while when first business and the second business are respectively less than the second integral threshold value, diagnosing the broad domain oxygen sensor is
Asymmetric peak operating lag failure mode；
When the very first time parameter not less than the 3rd threshold value, second time parameter more than the 3rd threshold value
Half, while first business be more than the first integral threshold value, second business be less than the first integral threshold value when, examine
The broad domain oxygen sensor that breaks passes through operating lag failure mode to be dilute to dense；
When the very first time parameter not less than the 3rd threshold value, second time parameter more than the 3rd threshold value
Half, while first business be less than the first integral threshold value, second business be more than the first integral threshold value when, examine
The broad domain oxygen sensor that breaks passes through operating lag failure mode to be dense to dilute；
When the very first time parameter not less than the 4th threshold value, second time parameter more than the 4th threshold value
Half, while first business be more than the second integral threshold value, second business be less than the second integral threshold value when, examine
The broad domain oxygen sensor that breaks arrives rich-spike value operating lag failure mode to be dilute；
When the very first time parameter not less than the 4th threshold value, second time parameter more than the 4th threshold value
Half, while first business be less than the second integral threshold value, second business be more than the second integral threshold value when, examine
The broad domain oxygen sensor that breaks postpones failure mode to be dense to dilute peak response.
Further, before the setting procedure, in addition to judge whether engine meets the step of physical diagnosis condition
Suddenly.
Further, before the step of judging engine physical diagnosis condition, in addition to judge that engine whether there is
The step of failure restraint.
The diagnostic method of the broad domain oxygen sensor response failure of the present invention, by setting set-point value, is calculated from dense respectively
To dilute and dilute to during dense, the difference in the reaction time of measured value and desired value, the measured value is with the desired value to institute
The business of the integration in reaction time is stated, contrast standard threshold values effectively distinguishes the failure that broad domain oxygen sensor carries out speed of response failure
Pattern, and calculate the delay degree of the speed of response.
According to the accompanying drawings to the detailed description of the specific embodiment of the invention, those skilled in the art will be brighter
Above-mentioned and other purposes, the advantages and features of the present invention.
Brief description of the drawings
Some specific embodiments of the present invention are described in detail by way of example, and not by way of limitation with reference to the accompanying drawings hereinafter.
Identical reference denotes same or similar part or part in accompanying drawing.It should be appreciated by those skilled in the art that these
What accompanying drawing was not necessarily drawn to scale.In accompanying drawing：
Fig. 1 is the workflow of the diagnostic method of broad domain oxygen sensor response failure according to an embodiment of the invention
Figure；
Fig. 2 a are the asymmetric peak operating lag failure modes of broad domain oxygen sensor according to an embodiment of the invention
Curve synoptic diagram；
Fig. 2 b are that the symmetrical of broad domain oxygen sensor according to an embodiment of the invention passes through operating lag failure mode
Curve synoptic diagram；
Fig. 2 c are that the dilute of broad domain oxygen sensor according to an embodiment of the invention arrives rich-spike value operating lag failure mode
Curve synoptic diagram；
Fig. 2 d are that the dense of broad domain oxygen sensor according to an embodiment of the invention postpones failure mode to dilute peak response
Curve synoptic diagram；
Fig. 2 e are that the dilute of broad domain oxygen sensor according to an embodiment of the invention passes through operating lag failure mode to dense
Curve synoptic diagram；
Fig. 2 f are that the dense of broad domain oxygen sensor according to an embodiment of the invention passes through operating lag failure mode to dilute
Curve synoptic diagram.
Embodiment
Fig. 1 is the workflow of the diagnostic method of broad domain oxygen sensor response failure according to an embodiment of the invention
Figure.Fig. 2 is the curve synoptic diagram of broad domain oxygen sensor speed of response failure mode according to an embodiment of the invention.In Fig. 2
10 represent target air-fuel ratio, and 20 represent desired value, and 30 represent measured value.As shown in figure 1, the diagnostic method of the present invention, for examining
Break and the speed of response failure mode of broad domain oxygen sensor, it may comprise steps of in general manner：
Judge that engine whether there is the step S100 of failure restraint, the failure restraint is by the former of engine control system
Barrier management system is detected and coordinated.
Judge whether engine meets the step S200 of physical diagnosis condition, the physical diagnosis condition turns including engine
Speed, engine load, engine intake airflow, the degree of fluctuation of engine intake airflow, the parameter such as delivery temperature at sensor,
The parameter is calculated by engine control system, judges the parameter whether in normal range (NR).
Setting procedure S300：Target air-fuel ratio and set-point value are set, wherein, the set-point value is according to lambda sensor
The transmission function of response is set, and set-point value described in the present embodiment is according to the single order step response letter of the response of lambda sensor
Count to set, be such as 2 τ in time parameter, obtain amplitude and be used as set-point value for 86.5%.
Judge whether target air-fuel ratio changes S400, if into next step, returning start if not.
Calculation procedure S500：When target air-fuel ratio changes, first process of the measured value from less than 1 to more than 1 is calculated,
It is i.e. dense to arrive dilute process：
The difference in the reaction time of measured value and desired value is calculated, the measured value and the measurement of change start time is calculated
The difference of value to the first absolute value of the integration in the reaction time, calculate the desired value and change start time measured value it
Difference calculates the business of first absolute value and second absolute value to the second absolute value of the integration in the reaction time,
Calculate second process of the measured value from more than 1 to less than 1, i.e., it is dilute to arrive dense process, repeat second mistake
The step of journey.
Wherein, the measured value is the ratio of the actual mixing ratio and chemically correct fuel measured by the broad domain oxygen sensor
Value, the desired value is the ratio that expected air-fuel ratio and the chemically correct fuel are calculated according to fuel injection parameter, the reaction
Time be the measured value or the desired value since change to the time for reaching the set-point value, it is described to start change and be
Refer to the broad domain oxygen sensor signal and a moment for making a response is changed to oil spout, when the measured value or the desired value reach
During to the set-point value, that is, think that the measured value or the desired value are made that change effective enough.
As the first business I1 obtained by the business that this step calculates the obtained integration includes first process calculating and institute
State the second process and calculate the second business I2 of gained.
Average and filter step S600：First process and second process are repeatedly calculated, and to multiple
Calculating obtains the difference and the business of the integration is averaged and filtered.
And judge the whether enough S700 of calculation times, if so, into comparison step S800, otherwise returning to average and filtering step
Rapid S600.
Comparison step S800：Calculating very first time parameter T1 and the second time parameter T2, the very first time parameter T1 is
First process and second process calculate obtained by it is the difference and, the second time parameter T2 is described first
The poor absolute value of process and the difference obtained by second process calculating；Described in after the business of the integration and processing
Difference is compared with level threshold value respectively, so as to be diagnosed to be the speed of response failure mode of lambda sensor.As shown in Fig. 2 a-f,
The speed of response failure mode includes asymmetric peak operating lag, dense to postpone to dilute peak response, dilute prolong to dense peak response
Late, operating lag is symmetrically passed through, dense operating lag passed through to dilute, dilute to dense passes through operating lag.The level threshold value includes width
Domain oxygen sensor symmetrically passes through the first threshold A1 of operating lag failure, broad domain oxygen sensor asymmetric peak operating lag failure
Asymmetric the 3rd threshold value A 3 for passing through operating lag failure of Second Threshold A2, broad domain oxygen sensor, broad domain oxygen sensor are asymmetric
4th threshold value A 4 of peak response delay fault, the first integral threshold value B1 that operating lag failure is passed through under the different delays time and
The second integral threshold value B2 of peak response delay fault under the different delays time.
When the very first time parameter T1 not less than the first threshold A1, the second time parameter T2 is less than described the
The half of one threshold value A 1, while when the first business I1 and the second business I2 are respectively less than the first integral threshold value B1, diagnosis is described
Broad domain oxygen sensor is symmetrically to pass through operating lag failure mode；
When the very first time parameter T1 not less than the Second Threshold A2, the second time parameter T2 is less than described the
The half of two threshold value As 2, while when the first business I1 and the second business I2 are respectively less than the second integral threshold value B2, diagnosis is described
Broad domain oxygen sensor is asymmetric peak operating lag failure mode；
When the very first time parameter T1 not less than the 3rd threshold value A 3, the second time parameter T2 is more than described the
The half of three threshold value As 3, while the first business I1, which is more than the first integral threshold value B1, the second business I2, is less than described the
During one integral threshold B1, diagnose the broad domain oxygen sensor and pass through operating lag failure mode to dense to be dilute；
When the very first time parameter T1 not less than the 3rd threshold value A 3, the second time parameter T2 is more than described the
The half of three threshold value As 3, while the first business I1, which is less than the first integral threshold value B1, the second business I2, is more than described the
During one integral threshold B1, diagnose the broad domain oxygen sensor and pass through operating lag failure mode to dilute to be dense；
When the very first time parameter T1 not less than the 4th threshold value A 4, the second time parameter T2 is more than described the
The half of four threshold value As 4, while the first business I1, which is more than the second integral threshold value B2, the second business I2, is less than described the
During two integral threshold B2, diagnose the broad domain oxygen sensor and arrive rich-spike value operating lag failure mode to be dilute；
When the very first time parameter T1 not less than the 4th threshold value A 4, the second time parameter T2 is more than described the
The half of four threshold value As 4, while the first business I1, which is less than the second integral threshold value B2, the second business I2, is more than described the
During two integral threshold B2, diagnose the broad domain oxygen sensor and postpone failure mode to dilute peak response to be dense.
So far, although those skilled in the art will appreciate that detailed herein have shown and described the exemplary of the present invention
Embodiment, still, without departing from the spirit and scope of the present invention, still can directly be determined according to present disclosure
Or derive many other variations or modifications for meeting the principle of the invention.Therefore, the scope of the invention should be understood and defined as
Cover other all these variations or modifications.
Claims (9)
1. a kind of diagnostic method of broad domain oxygen sensor response failure, the speed of response for being diagnosed to be broad domain oxygen sensor fails
Pattern, comprises the following steps：
Setting procedure：Target air-fuel ratio and set-point value are set, wherein, the set-point value is according to the biography of the response of lambda sensor
Delivery function is set；
Judge whether target air-fuel ratio changes；
Calculation procedure：When target air-fuel ratio changes, first process of the measured value from less than 1 to more than 1 is calculated,
Calculate the difference in the reaction time of measured value and desired value, calculate the measured value and change start time measured value it
Difference calculates the desired value and changes the difference pair of the measured value of start time to the first absolute value of the integration in the reaction time
Second absolute value of the integration in the reaction time, and calculate the business of first absolute value and second absolute value,
Second process of the measured value from more than 1 to less than 1 is calculated, is repeated the above steps,
Wherein, the measured value is the ratio of the actual mixing ratio and chemically correct fuel measured by the broad domain oxygen sensor,
The desired value is the ratio that expected air-fuel ratio and the chemically correct fuel are calculated according to fuel injection parameter, the reaction time
For the measured value or the desired value since change to the time for reaching the set-point value；
Comparison step：The difference is handled, the difference after the business of the integration and processing is carried out with level threshold value respectively
Compare, so as to be diagnosed to be the speed of response failure mode of lambda sensor.
2. diagnostic method according to claim 1, it is characterised in that also include before the comparison step average and filter
Ripple step, is that first process and second process are repeatedly calculated, and to repeatedly calculating obtain the difference and
The business of the integration is averaged and filtered, and judges whether calculation times are enough, if so, into comparison step, otherwise returning
Previous step.
3. diagnostic method according to claim 1 or 2, it is characterised in that the set-point value is according to the sound of lambda sensor
The single order step response functions answered are set.
4. the diagnostic method according to any one of claim 1-3, it is characterised in that the place described in the comparison step
Reason refers to calculating very first time parameter and the second time parameter, wherein, the very first time parameter is first process and institute
The sum of the difference obtained by the calculating of the second process is stated, second time parameter is first process and second process
The poor absolute value of the difference obtained by calculating；
The business of the integration includes the first business and second process calculating the second business of gained obtained by first process calculating.
5. the diagnostic method according to any one of claim 1-4, it is characterised in that the speed of response failure mode bag
Include asymmetric peak operating lag, it is dense to the delay of dilute peak response, it is dilute to rich-spike value operating lag, symmetrically pass through operating lag, it is dense
Pass through operating lag to dilute and dilute to dense pass through operating lag.
6. diagnostic method according to claim 5, it is characterised in that it is symmetrical that the level threshold value includes broad domain oxygen sensor
Pass through first threshold A1, Second Threshold A2, the width of broad domain oxygen sensor asymmetric peak operating lag failure of operating lag failure
Asymmetric the 3rd threshold value for passing through operating lag failure of domain oxygen sensor, the asymmetric peak value operating lag failure of broad domain oxygen sensor
The 4th threshold value, the first integral threshold value of operating lag failure is passed through under the different delays time and peak value rings under the different delays time
Answer the second integral threshold value of delay fault.
7. diagnostic method according to claim 6, it is characterised in that
When the very first time parameter not less than the first threshold, second time parameter less than the one of the first threshold
Half, while when first business is respectively less than the first integral threshold value with the second business, it is symmetrical to diagnose the broad domain oxygen sensor
Pass through operating lag failure mode；
When the very first time parameter not less than the Second Threshold, second time parameter less than the one of the Second Threshold
Half, while when first business is respectively less than the second integral threshold value with the second business, it is symmetrical to diagnose the broad domain oxygen sensor
Peak response postpones failure mode；
When the very first time parameter not less than the 3rd threshold value, second time parameter more than the one of the 3rd threshold value
Half, while when first business is more than the first integral threshold value, second business less than the first integral threshold value, diagnosing institute
State broad domain oxygen sensor and pass through operating lag failure mode to dense to be dilute；
When the very first time parameter not less than the 3rd threshold value, second time parameter more than the one of the 3rd threshold value
Half, while when first business is less than the first integral threshold value, second business more than the first integral threshold value, diagnosing institute
State broad domain oxygen sensor and pass through operating lag failure mode to dilute to be dense；
When the very first time parameter not less than the 4th threshold value, second time parameter more than the one of the 4th threshold value
Half, while when first business is more than the second integral threshold value, second business less than the second integral threshold value, diagnosing institute
State broad domain oxygen sensor and arrive rich-spike value operating lag failure mode to be dilute；
When the very first time parameter not less than the 4th threshold value, second time parameter more than the one of the 4th threshold value
Half, while when first business is less than the second integral threshold value, second business more than the second integral threshold value, diagnosing institute
State broad domain oxygen sensor and postpone failure mode to dilute peak response to be dense.
8. the diagnostic method according to any one of claim 1-7, it is characterised in that before the setting procedure, also
Including the step of whether engine meets physical diagnosis condition judged.
9. diagnostic method according to claim 8, it is characterised in that the step of engine physical diagnosis condition is judged it
Before, in addition to judge the step of engine whether there is failure restraint.
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| CN109372618A (en) * | 2018-12-06 | 2019-02-22 | 东风汽车集团有限公司 | Automobile-used broad domain oxygen sensor failure monitor method |
| CN113090397A (en) * | 2021-04-01 | 2021-07-09 | 联合汽车电子有限公司 | Parameter identification method for engine mixed gas control system |
| CN113931758A (en) * | 2020-06-29 | 2022-01-14 | 比亚迪股份有限公司 | Wide-range oxygen sensor aging diagnosis method and device, readable storage medium and vehicle |
| CN114962032A (en) * | 2022-06-08 | 2022-08-30 | 东风汽车集团股份有限公司 | Engine wide-range oxygen sensor degradation diagnosis method |
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| CN114962032A (en) * | 2022-06-08 | 2022-08-30 | 东风汽车集团股份有限公司 | Engine wide-range oxygen sensor degradation diagnosis method |
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