CN106996341B - 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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- CN106996341B CN106996341B CN201710189380.1A CN201710189380A CN106996341B CN 106996341 B CN106996341 B CN 106996341B CN 201710189380 A CN201710189380 A CN 201710189380A CN 106996341 B CN106996341 B CN 106996341B
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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)
- Mechanical Engineering (AREA)
- 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 methods of broad domain oxygen sensor response failure, belong to vehicular field.The diagnostic method includes: setting target air-fuel ratio and set-point value；Judge whether target air-fuel ratio changes；Measured value is calculated separately from dense to dilute and the difference in the reaction time of dilute measured value and desired value to dense process, calculate the measured value and changes the quotient of the difference of the measured value of start time to the difference of the first absolute value of the integral in the reaction time and the desired value and the measured value of variation start time to the second absolute value of the integral in the reaction time；Difference is handled, difference is compared with level threshold value respectively with treated by quotient, to be diagnosed to be speed of response failure mode.Diagnostic method of the invention, by the way that set-point value is arranged, it calculates separately from dense to dilute with dilute to dense above-mentioned difference and quotient and contrast standard threshold values in the process, 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 fields, more particularly to a kind of diagnostic method of broad domain oxygen sensor response failure.
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 the dynamic response of sensor: " (for the sensor of fuel oil control, traditional opens lambda sensor before OBD system is coped with
Pass type sensor and/or wide area or general purpose transducer) failure be monitored, monitoring content includes output voltage, the speed of response
With the parameter that may influence discharge ".
In the prior art for the Diagnostic Strategy of vehicle oxygen sensor failure mainly for switching mode lambda sensor, but needle
Broad domain oxygen sensor is not suitable for the Diagnostic Strategy of switching mode lambda sensor.Meanwhile examining for broad domain oxygen sensor failure
It is disconnected, it is diagnosed currently on the market just for asymmetric peak response Delay failure mode.
Therefore, broad domain oxygen sensor currently on the market cannot carry out efficient diagnosis to other speed of response failure modes,
It is not able to satisfy the requirement of state six and OBDII regulation.
Summary of the invention
It is an object of the present invention to provide a kind of diagnostic methods of broad domain oxygen sensor response failure, can effectively distinguish width
The fault mode of domain oxygen sensor speed of response failure, and calculate the delay degree of the speed of response.
Particularly, the present invention provides a kind of diagnostic methods of broad domain oxygen sensor response failure, for being diagnosed to be wide area
The speed of response failure mode of lambda sensor, comprising the following steps:
Setting procedure: setting target air-fuel ratio and set-point value, wherein the set-point value is according to the response of lambda sensor
Transmission function set；
Judge whether target air-fuel ratio changes；
Calculate step: when target air-fuel ratio changes, calculate measured value from less than 1 to be greater than 1 the first process,
The difference for calculating the reaction time of measured value and desired value calculates the measured value and changes the measurement of start time
The difference of value to the first absolute value of the integral in the reaction time, calculate the desired value and change start time measured value it
Difference calculates the quotient of first absolute value Yu second absolute value to the second absolute value of the integral in the reaction time,
The measured value is calculated from being greater than 1 to the second process less than 1, is repeated the above steps,
Wherein, the measured value is the ratio of the actual air-fuel ratio and chemically correct fuel that are measured by the broad domain oxygen sensor
Value, the desired value is the ratio that expected air-fuel ratio Yu the chemically correct fuel are calculated according to fuel injection parameter, the reaction
Time be the measured value or the desired value since variation to the time for reaching the set-point value；
Comparison step: handling the difference, by the quotient of the integral and treated the difference respectively with level threshold value
It is compared, to be diagnosed to be the speed of response failure mode of lambda sensor.
Further, further include average and filter step before the comparison step, be to first process and institute
It states the second process repeatedly to be calculated, and the quotient that the difference and the integral is repeatedly calculated is averaged and is filtered,
And whether judge calculation times enough, if so, otherwise returning to previous step into comparison step.
Further, the set-point value is set according to the single order step response functions of the response of lambda sensor.
Further, processing described in the comparison step, which refers to, calculates first time parameter and the second time parameter,
Wherein, the first time parameter be first process and second process calculate the resulting difference and, it is described
Second time parameter is the absolute value of the difference that first process and second process calculate the resulting difference；
The quotient of the integral includes that first process calculates resulting first quotient and second process calculates gained the
Two quotient.
Further, the speed of response failure mode includes 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 pass through operating lag to dense.
Further, the level threshold value includes the first threshold that broad domain oxygen sensor symmetrically passes through operating lag failure
A1, the second threshold A2 of broad domain oxygen sensor asymmetric peak operating lag failure, broad domain oxygen sensor asymmetry are passed through response and are prolonged
The third threshold value of slow failure, the 4th threshold value of broad domain oxygen sensor asymmetry peak value operating lag failure, 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, when the first time parameter is less than institute not less than the first threshold, second time parameter
It states the half of first threshold, while when first quotient and the second quotient are respectively less than the first integral threshold value, diagnosing the wide area
Lambda sensor is symmetrically to pass through operating lag failure mode；
When the first time parameter is less than the second threshold not less than the second threshold, second time parameter
Half, while when first quotient and the second quotient are respectively less than the second integral threshold value, diagnosing the broad domain oxygen sensor is
Asymmetric peak operating lag failure mode；
When the first time parameter is greater than the third threshold value not less than the third threshold value, second time parameter
Half, while first quotient be greater than the first integral threshold value, second quotient be less than the first integral threshold value when, examine
The broad domain oxygen sensor that breaks passes through operating lag failure mode to dense to be dilute；
When the first time parameter is greater than the third threshold value not less than the third threshold value, second time parameter
Half, while first quotient be less than the first integral threshold value, second quotient be greater than the first integral threshold value when, examine
The broad domain oxygen sensor that breaks passes through operating lag failure mode to dilute to be dense；
When the first time parameter is greater than the 4th threshold value not less than the 4th threshold value, second time parameter
Half, while first quotient be greater than the second integral threshold value, second quotient be less than the second integral threshold value when, examine
The broad domain oxygen sensor that breaks is dilute to rich-spike value operating lag failure mode；
When the first time parameter is greater than the 4th threshold value not less than the 4th threshold value, second time parameter
Half, while first quotient be less than the second integral threshold value, second quotient be greater than the second integral threshold value when, examine
The broad domain oxygen sensor that breaks is dense to dilute peak response delay failure mode.
It further, further include judging whether engine meets the step of physical diagnosis condition before the setting procedure
Suddenly.
It further, further include judging that engine whether there is before the step of judging engine physical diagnosis condition
The step of failure restraint.
The diagnostic method of broad domain oxygen sensor response failure of the invention is calculated separately by the way that set-point value is arranged from dense
To dilute and dilute to during dense, the difference in the reaction time of measured value and desired value, the measured value and the desired value are to institute
The quotient of the integral in reaction time is stated, contrast standard threshold values effectively distinguishes the failure that broad domain oxygen sensor carries out speed of response failure
Mode, and calculate the delay degree of the speed of response.
According to the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will be brighter
The above and other objects, advantages and features of the present invention.
Detailed description of the invention
Some specific embodiments of the present invention is described in detail by way of example and not limitation with reference to the accompanying drawings hereinafter.
Identical appended drawing reference denotes same or similar part or part in attached drawing.It should be appreciated by those skilled in the art that these
What attached drawing was not necessarily drawn to scale.In attached 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 is the asymmetric peak operating lag failure mode of broad domain oxygen sensor according to an embodiment of the invention
Curve synoptic diagram；
Fig. 2 b is 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 is the dilute to rich-spike value operating lag failure mode of broad domain oxygen sensor according to an embodiment of the invention
Curve synoptic diagram；
Fig. 2 d is 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 is 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 is 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.
Specific 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 indicate target air-fuel ratio, and 20 indicate desired value, and 30 indicate measured value.As shown in Figure 1, diagnostic method of the invention, for examining
The speed of response failure mode of disconnected broad domain oxygen sensor out, generally may comprise steps of:
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 is coordinated.
Judge whether engine meets the step S200 of physical diagnosis condition, the physical diagnosis condition includes that engine turns
Speed, engine load, engine intake airflow, the degree of fluctuation of engine intake airflow, the parameters such as delivery temperature at sensor,
The parameter is calculated by engine control system, judges the parameter whether in the normal range.
Setting procedure S300: setting target air-fuel ratio and set-point value, 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
Number to set, such as time parameter be 2 τ, obtain amplitude be 86.5% be used as set-point value.
Judge whether target air-fuel ratio changes S400, if entering in next step, returns start if not.
Calculate step S500: when target air-fuel ratio changes, calculate measured value from less than 1 to be greater than 1 the first process,
It is i.e. dense to arrive dilute process:
The difference for calculating the reaction time of measured value and desired value calculates the measured value and changes the measurement of start time
The difference of value to the first absolute value of the integral in the reaction time, calculate the desired value and change start time measured value it
Difference calculates the quotient of first absolute value Yu second absolute value to the second absolute value of the integral in the reaction time,
The measured value is calculated from being greater than 1 to the second process 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 air-fuel ratio and chemically correct fuel that are measured by the broad domain oxygen sensor
Value, the desired value is the ratio that expected air-fuel ratio Yu the chemically correct fuel are calculated according to fuel injection parameter, the reaction
Time, which is the measured value or the desired value, to be started since variation to the time for reaching the set-point value, it is described start to change be
Refer to that the broad domain oxygen sensor signal changes a moment made a response to oil spout, when the measured value or the desired value reach
When to the set-point value, that is, think that the measured value or the desired value are made that variation effective enough.
The quotient for the integral being calculated by this step includes that first process calculates resulting first quotient I1 and institute
It states the second process and calculates the second quotient I2 of gained.
Average and filter step S600: first process and second process are repeatedly calculated, and to multiple
The quotient that the difference and the integral is calculated is averaged and filters.
And judge the whether enough S700 of calculation times, if so, otherwise returning to average and filtering step into comparison step S800
Rapid S600.
Comparison step S800: calculating first time parameter T1 and the second time parameter T2, the first time parameter T1 is
First process and second process calculate the resulting difference and, the second time parameter T2 is described first
Process and second process calculate the absolute value of the difference of the resulting difference；By the quotient of the integral with that treated is described
Difference is compared with level threshold value respectively, 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, it is dense to the delay of dilute peak response, dilute prolong to dense peak response
Late, operating lag is symmetrically passed through, dense operating lag passed through to dilute, dilute passes through operating lag to dense.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
It is asymmetric that second threshold A2, broad domain oxygen sensor asymmetry pass through the third threshold value A 3 of operating lag failure, broad domain oxygen sensor
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 first time parameter T1 is less than described the not less than the first threshold A1, the second time parameter T2
The half of one threshold value A 1, while when the first quotient I1 and the second quotient I2 are respectively less than the first integral threshold value B1, described in diagnosis
Broad domain oxygen sensor is symmetrically to pass through operating lag failure mode；
When the first time parameter T1 is less than described the not less than the second threshold A2, the second time parameter T2
The half of two threshold value As 2, while when the first quotient I1 and the second quotient I2 are respectively less than the second integral threshold value B2, described in diagnosis
Broad domain oxygen sensor is asymmetric peak operating lag failure mode；
When the first time parameter T1 is greater than described the not less than the third threshold value A 3, the second time parameter T2
The half of three threshold value As 3, while the first quotient I1 is greater than the first integral threshold value B1, the second quotient I2 and is less than described the
When one integral threshold B1, the broad domain oxygen sensor is diagnosed to be dilute and passes through operating lag failure mode to dense；
When the first time parameter T1 is greater than described the not less than the third threshold value A 3, the second time parameter T2
The half of three threshold value As 3, while the first quotient I1 is less than the first integral threshold value B1, the second quotient I2 and is greater than described the
When one integral threshold B1, the broad domain oxygen sensor is diagnosed to be dense and passes through operating lag failure mode to dilute；
When the first time parameter T1 is greater than described the not less than the 4th threshold value A 4, the second time parameter T2
The half of four threshold value As 4, while the first quotient I1 is greater than the second integral threshold value B2, the second quotient I2 and is less than described the
When two integral threshold B2, diagnosing the broad domain oxygen sensor is dilute to rich-spike value operating lag failure mode；
When the first time parameter T1 is greater than described the not less than the 4th threshold value A 4, the second time parameter T2
The half of four threshold value As 4, while the first quotient I1 is less than the second integral threshold value B2, the second quotient I2 and is greater than described the
When two integral threshold B2, diagnosing the broad domain oxygen sensor is dense to dilute peak response delay failure mode.
So far, although those skilled in the art will appreciate that present invention has been shown and described in detail herein is exemplary
Embodiment still without departing from the spirit and scope of the present invention, can still directly determine according to the present disclosure
Or derive many other variations or modifications consistent with the principles of the invention.Therefore, the scope of the invention should be understood and defined as
Cover all such other 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 fail
Mode, comprising the following steps:
Setting procedure: setting target air-fuel ratio and set-point value, 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；
Calculate step: when target air-fuel ratio changes, calculate measured value from less than 1 to be greater than 1 the first process,
The difference for calculating 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 integral in the reaction time
Second absolute value of the integral in the reaction time, and the quotient of first absolute value Yu second absolute value is calculated,
The measured value is calculated from being greater than 1 to the second process less than 1, is repeated the above steps,
Wherein, the measured value is the ratio of the actual air-fuel ratio and chemically correct fuel that are measured by the broad domain oxygen sensor,
The desired value is the ratio that expected air-fuel ratio Yu the chemically correct fuel are calculated according to fuel injection parameter, the reaction time
For the measured value or the desired value to the time for reaching the set-point value since variation；
Comparison step: handling the difference, and by the quotient of the integral, the difference is carried out with level threshold value respectively with treated
Compare, to be diagnosed to be the speed of response failure mode of lambda sensor.
2. diagnostic method according to claim 1, which is characterized in that further include averagely and filtering before the comparison step
Wave step, be first process and second process are repeatedly calculated, and to be repeatedly calculated the difference and
The quotient of the integral is averaged and filters, and whether judge calculation times enough, if so, otherwise returning into comparison step
Previous step.
3. diagnostic method according to claim 2, which is characterized in that the set-point value is according to the response of lambda sensor
Single order step response functions are set.
4. diagnostic method according to any one of claim 1-3, which is characterized in that place described in the comparison step
Reason, which refers to, calculates first time parameter and the second time parameter, wherein the first time parameter is first process and institute
The sum that the second process calculates the resulting difference is stated, second time parameter is first process and second process
Calculate the absolute value of the difference of the resulting difference；
The quotient of the integral includes that first process calculates resulting first quotient and second process calculating the second quotient of gained.
5. diagnostic method according to claim 4, which is characterized in that the speed of response failure mode includes 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, dense pass through sound to dilute
It should postpone and dilute pass through operating lag to dense.
6. diagnostic method according to claim 5, which is characterized in that the level threshold value includes that broad domain oxygen sensor is symmetrical
Pass through the first threshold A1 of operating lag failure, second threshold A2, the width of broad domain oxygen sensor asymmetric peak operating lag failure
Domain oxygen sensor asymmetry passes through the third threshold value of operating lag failure, broad domain oxygen sensor asymmetry peak value operating lag failure
The 4th threshold value, the first integral threshold value of operating lag failure is passed through under the different delays time and peak value is rung under the different delays time
Answer the second integral threshold value of delay fault.
7. diagnostic method according to claim 6, which is characterized in that
When the first time parameter is less than the one of the first threshold not less than the first threshold, second time parameter
Partly, when while first quotient and the second quotient are respectively less than the first integral threshold value, it is symmetrical for diagnosing the broad domain oxygen sensor
Pass through operating lag failure mode；
When the first time parameter is less than the one of the second threshold not less than the second threshold, second time parameter
Partly, when while first quotient and the second quotient are respectively less than the second integral threshold value, it is symmetrical for diagnosing the broad domain oxygen sensor
Peak response postpones failure mode；
When the first time parameter is greater than the one of the third threshold value not less than the third threshold value, second time parameter
Partly, when while first quotient is greater than the first integral threshold value, second quotient is less than the first integral threshold value, institute is diagnosed
It states broad domain oxygen sensor and passes through operating lag failure mode to dense to be dilute；
When the first time parameter is greater than the one of the third threshold value not less than the third threshold value, second time parameter
Partly, when while first quotient is less than the first integral threshold value, second quotient is greater than the first integral threshold value, institute is diagnosed
It states broad domain oxygen sensor and passes through operating lag failure mode to dilute to be dense；
When the first time parameter is greater than the one of the 4th threshold value not less than the 4th threshold value, second time parameter
Partly, when while first quotient is greater than the second integral threshold value, second quotient is less than the second integral threshold value, institute is diagnosed
Stating broad domain oxygen sensor is dilute to rich-spike value operating lag failure mode；
When the first time parameter is greater than the one of the 4th threshold value not less than the 4th threshold value, second time parameter
Partly, when while first quotient is less than the second integral threshold value, second quotient is greater than the second integral threshold value, institute is diagnosed
Stating broad domain oxygen sensor is dense to dilute peak response delay failure mode.
8. diagnostic method according to claim 1, which is characterized in that further include judgement hair before the setting procedure
Whether motivation meets the step of physical diagnosis condition.
9. diagnostic method according to claim 8, which is characterized in that the step of judging engine physical diagnosis condition it
Before, further include the steps that judging engine with the presence or absence of failure restraint.
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| CN108398527B (en) * | 2018-01-31 | 2021-02-23 | 广西玉柴机器股份有限公司 | Oxygen sensor detection method for natural gas engine |
| CN109372618B (en) * | 2018-12-06 | 2019-11-05 | 东风汽车集团有限公司 | Automobile-used broad domain oxygen sensor failure monitor method |
| 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 |
| CN113090397B (en) * | 2021-04-01 | 2023-07-04 | 联合汽车电子有限公司 | Engine gas mixture control system parameter identification method and readable storage medium |
| CN114962032B (en) * | 2022-06-08 | 2023-04-11 | 东风汽车集团股份有限公司 | Engine wide-range oxygen sensor degradation diagnosis method |
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