CN109061073A - A kind of oxygen sensor diagnostic device and its diagnostic method - Google Patents
A kind of oxygen sensor diagnostic device and its diagnostic method Download PDFInfo
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- CN109061073A CN109061073A CN201811199690.2A CN201811199690A CN109061073A CN 109061073 A CN109061073 A CN 109061073A CN 201811199690 A CN201811199690 A CN 201811199690A CN 109061073 A CN109061073 A CN 109061073A
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 239000001301 oxygen Substances 0.000 title claims abstract description 45
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 45
- 238000002405 diagnostic procedure Methods 0.000 title claims abstract description 11
- 238000001514 detection method Methods 0.000 claims abstract description 27
- 238000010438 heat treatment Methods 0.000 claims description 50
- 238000012360 testing method Methods 0.000 claims description 20
- 230000006698 induction Effects 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 5
- 230000001939 inductive effect Effects 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 11
- 230000008569 process Effects 0.000 abstract description 7
- 230000007257 malfunction Effects 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 abstract description 3
- 230000006870 function Effects 0.000 description 9
- 239000000446 fuel Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000003745 diagnosis Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000008246 gaseous mixture Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/007—Arrangements to check the analyser
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0006—Calibrating gas analysers
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Medicinal Chemistry (AREA)
- Food Science & Technology (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Measuring Oxygen Concentration In Cells (AREA)
Abstract
The invention discloses a kind of oxygen sensor diagnostic devices, it is connect with lambda sensor, the electronic control unit ECU being detachably connected including lambda sensor by grafting harness, the atmosphere calibration factor standard value of oxygen sensor and the adding thermal resistance normal value of lambda sensor are prestored in electronic control unit ECU, the input terminal of electronic control unit ECU is connected with power supply unit, ambient humidity sensor for detecting the ambient pressure sensor of lambda sensor ambient pressure signal and for detecting lambda sensor ambient humidity signal, the output end of electronic control unit ECU is connected with diagnostic result prompt unit, also disclose the specific diagnostic method of the diagnostic device, can directly judge whether suspected malfunctions lambda sensor function is effective through the invention, when lambda sensor finds that part is effective in the detection process, it can be continued to use by self-adjusting, to save The process that this part lambda sensor is sent to producer's detection, and it is easy to operate, it is easy to use, save the cost of maintenance.
Description
Technical field
The present invention relates to engine lambda sensor detection technique field more particularly to a kind of oxygen sensor diagnostic device,
Further relate to the specific diagnostic method of the diagnostic device.
Background technique
It is installed on the lambda sensor of engine exhaust pipe end, is to realize gaseous mixture in cylinder according to theory air-fuel ratio combustion
The key sensor of control, when engine exhaust gas flows through lambda sensor head, feedback is generated a voltage signal by it
And it is transferred to engine electric-controlled unit ECU, by engine electric-controlled unit ECU by analysis voltage signal, judge mixing in cylinder
After gas is dilute or dense state, and generates a pump electric current and flow through the pump oxygen diaphragm of lambda sensor, thus consume excessive oxygen or
Fuel maintains the concentration of gaseous mixture in cylinder near chemically correct fuel always.Actual vehicle is mating and use process
In, lambda sensor usually can be improper because of installation site, application method, there are the failures such as sensor measurement failure, sintering, damage,
The problems such as to make engine show gas consumption height, be short of power or run abnormal sound.
But the failure rate of lambda sensor is high in existing market, and wherein the False Rate of lambda sensor is also larger, in addition to
Suspected malfunctions lambda sensor of the only a few within duration of insurance is sent to outside producer's diagnosis, to most of lambda sensor, is not had still at present
There are a kind of comprehensive and efficient diagnostic device and method, it is whether effective to diagnose its function.Therefore it is badly in need of providing a kind of pair of oxygen biography
Sensor carries out efficient diagnosis, lambda sensor and is replaced in order to find the problem in time, to guarantee the efficient operation of engine
System and method.
Summary of the invention
Technical problem to be solved by the invention is to provide one kind can reduce False Rate, easy to operate, easy to use
Oxygen sensor diagnostic device.
In order to solve the above technical problems, the technical scheme is that a kind of oxygen sensor diagnostic device, with lambda sensor
Connection, in the electronic control unit ECU, the electronic control unit ECU being detachably connected including the lambda sensor by grafting harness in advance
There are the atmosphere calibration factor standard value of the lambda sensor and the adding thermal resistance normal value of the lambda sensor, the automatically controlled list
The input terminal of first ECU is connected with power supply unit, the ambient pressure sensor for detecting the lambda sensor ambient pressure signal
Connect with the output end of the ambient humidity sensor for detecting the lambda sensor ambient humidity signal, the electronic control unit ECU
It is connected to diagnostic result prompt unit.
Said supply unit includes DC power supply as a preferred technical solution, the anode and cathode of the DC power supply
The electronic control unit ECU is connected to by conducting wire respectively, has been sequentially connected in series on the conducting wire being connect with the anode of the DC power supply
Power switch and fuse.
The range of the atmosphere calibration factor standard value is 1 ± 0.05 as a preferred technical solution,；The adding thermal resistance
The range of normal value is 3.2 ± 0.8 Ω.
The lambda sensor is equipped with oxygen induction pin, semifixed resistor pin, heating power supply as a preferred technical solution,
Positive pin, heating power supply negative pin, virtual ground pin and pump current legs, the oxygen induction pin connect aerobic induction
Component, the semifixed resistor pin are connected with heating component, and the heating power supply anode pin is connected to the anode of heating power supply,
The heating power supply negative pin is connected to the cathode of the heating power supply, the heating power supply anode pin and heating electricity
Heater switch, the virtual ground pin ground connection setting are serially connected between the anode in source, the pump current legs are connected with pressurization
Component.
The diagnostic result prompt unit includes being connected to the electronic control unit ECU output as a preferred technical solution,
The power lamp at end, burns matter signal lamp, heating signal lamp and demarcation signal lamp at test signal lamp.
The invention further relates to the specific diagnostic methods of the oxygen sensor diagnostic device, comprising the following steps:
Step 1: opening said supply unit, the electronic control unit ECU is enable to obtain electric energy from said supply unit,
The power lamp is lighted, and the oxygen sensor diagnostic device is prepared to enter into diagnostic work；
Step 2: the electronic control unit ECU receives the heating parameters of the heating component by the grafting harness, pass through
Processing forms the adding thermal resistance value detected value of the lambda sensor, and the heating with the electronic control unit ECU storage inside
Resistance normal value is compared, described when the adding thermal resistance value detected value is fallen into the range of the adding thermal resistance normal value
Lambda sensor is effective, into next step；Otherwise the lambda sensor failure, detection terminate；
Step 3: what the ambient pressure signal and the ambient humidity sensor of the ambient pressure sensor detection detected
Ambient humidity signal is respectively sent to the electronic control unit ECU, and the electronic control unit ECU calculates oxygen according to the signal received
The atmosphere calibration factor test value of sensor, the electronic control unit ECU is by the atmosphere calibration factor test value and the atmosphere
Calibration factor standard value is compared, and the atmosphere calibration factor test value falls into the normal of the atmosphere calibration factor standard value
When range, the lambda sensor is effective, while the test signal lamp lights flashing, and enters in next step；Otherwise the oxygen passes
Sensor failure, detection terminate；
Step 4: the heater switch is closed, the lambda sensor is enable to obtain electric energy from the heating power supply, institute
It states lambda sensor to start to be heated, when the lambda sensor can be heated and be heated to normal temperature range, the oxygen is passed
Sensor is effective, into next step；The lambda sensor cannot be heated or can be heated but cannot be heated to normal temperature model
When enclosing, the lambda sensor failure is judged, the heating signal lamp is lighted, and detection terminates；
Step 5: the electronic control unit ECU judge the lambda sensor atmosphere calibration factor whether can adjust automatically,
The electronic control unit ECU determines that the atmosphere calibration factor of the lambda sensor cannot carry out automatically, then judges the lambda sensor
Failure, the demarcation signal lamp light flashing, and detection terminates；The electronic control unit ECU determines the atmosphere mark of the lambda sensor
Determining the factor can carry out automatically, and by the atmosphere calibration factor of the lambda sensor adjusted and the atmosphere calibration factor standard
Value is compared, when the atmosphere calibration factor adjusted falls into the normal range (NR) of the atmosphere calibration factor standard value, institute
State that lambda sensor function is normal, and test terminates；Otherwise enter in next step, activate the burning matter function of the lambda sensor；
Step 6: the lambda sensor, which is continued heating, burns matter, until burning matter temperature, and 45~80s, the burning matter are maintained
Signal lamp is lighted, and step 3 is then return to, and is obtained the secondary atmosphere calibration factor for burning the lambda sensor after matter, is passed through institute
It states electronic control unit ECU to compare, the secondary atmosphere calibration factor of the lambda sensor falls into the atmosphere calibration factor standard value
When normal range (NR), the electronic control unit ECU determines that the lambda sensor is finally effective；Otherwise the electronic control unit ECU determines institute
Lambda sensor ultimate failure is stated, the demarcation signal lamp lights flashing, and detection terminates.
The normal temperature range of the lambda sensor is 780 ± 5 DEG C as a preferred technical solution,.
The burning matter temperature range is 800~900 DEG C as a preferred technical solution,.
By adopting the above-described technical solution, the invention has the following advantages:
1, by the diagnostic device and diagnostic method, can directly judge whether suspected malfunctions lambda sensor function is effective；
2, lambda sensor find in the detection process part be it is effective, can be continued to use by self-adjusting, thus saving
The process that this part lambda sensor is sent to producer's detection, has saved time and cost；
3, the failure False Rate of lambda sensor is greatly reduced, and easy to operate, it is easy to use, it has saved enterprise's maintenance and has protected
Feeding cost.
Detailed description of the invention
The following drawings are only intended to schematically illustrate and explain the present invention, not delimit the scope of the invention.Wherein:
Fig. 1 is the structural block diagram of the embodiment of the present invention；
Fig. 2 is the diagnostic flow chart of the embodiment of the present invention.
Specific embodiment
With reference to the accompanying drawings and examples, the present invention is further explained.In the following detailed description, only pass through explanation
Mode describes certain exemplary embodiments of the invention.Undoubtedly, those skilled in the art will recognize,
In the case where without departing from the spirit and scope of the present invention, described embodiment can be repaired with a variety of different modes
Just.Therefore, attached drawing and description are regarded as illustrative in nature, and are not intended to limit the scope of the claims.
As shown in Figure 1, a kind of oxygen sensor diagnostic device, connect with lambda sensor, including the lambda sensor is by inserting
The electronic control unit ECU that wiring beam is detachably connected, specifically, the lambda sensor is equipped with oxygen induction pin, semifixed resistor draws
Foot, heating power supply anode pin, heating power supply negative pin, virtual ground pin and pump current legs, the oxygen incude pin
Aerobic inductive component is connected, the semifixed resistor pin is connected with heating component, and the heating power supply anode pin, which is connected to, to be added
The anode of thermoelectric generator, the heating power supply negative pin are connected to the cathode of the heating power supply, and the heating power supply anode draws
Heater switch, the virtual ground pin ground connection setting, the pump electric current are serially connected between foot and the anode of the heating power supply
Pin is connected with pressure-applying unit.Various pins cooperation on the lambda sensor is believed for receiving the detection of the oxygen inductive component
Number, while the heating temperature of the heating component is controlled, wherein the specific structure of the oxygen inductive component and the heating component
For content known to those of ordinary skill in the art.The lambda sensor is by the grafting harness by lambda sensor
Detection signal and various working signals are transferred to the electronic control unit ECU, for electronic control unit ECU processing, analyze, right
Than using.The electronic control unit ECU includes the structures such as processor, display, hard disk, memory and system bus.
The atmosphere calibration factor standard value and oxygen sensing of the lambda sensor are prestored in the electronic control unit ECU
The adding thermal resistance normal value of device, specifically, the range of the atmosphere calibration factor standard value are 1 ± 0.05；The adding thermal resistance
The range of normal value is 3.2 ± 0.8 Ω, and the signal that the lambda sensor detects drives to the electronic control unit ECU, by described
It is compared after electronic control unit ECU processing with the atmosphere calibration factor standard value and the adding thermal resistance normal value, in order to
Obtain the lambda sensor function effectively or failure conclusion.
Power supply unit is connected with, for detecting the lambda sensor environmental pressure in the input terminal of the electronic control unit ECU
The ambient pressure sensor of signal and ambient humidity sensor for detecting the lambda sensor ambient humidity signal, pass through institute
State ambient pressure sensor and the ambient humidity sensor can with the environmental parameter of lambda sensor described in real-time detection, in order to
It is handled by the electronic control unit ECU and obtains atmosphere calibration factor test value and adding thermal resistance value detected value, it is described as obtaining
The function of lambda sensor is effectively or the foundation of failure conclusion.
The embodiment of the present invention power supply unit includes DC power supply, and the anode and cathode of the DC power supply pass through respectively leads
Line is connected to the electronic control unit ECU, be sequentially connected in series on the conducting wire that connect of anode of the DC power supply power switch and
Fuse.When needing to carry out diagnostic work, first the power switch is disconnected, using the grafting harness by the lambda sensor
It is connected to the input terminal of the electronic control unit ECU, is closed by the power switch, diagnostic work can be carried out.The insurance
The setting of silk, helps to protect the electronic control unit ECU and the lambda sensor, will when avoiding the occurrence of overcurrent or short circuit phenomenon
The two is burnt out.
Diagnostic result prompt unit, the diagnostic result prompt unit are connected in the output end of the electronic control unit ECU
Including being connected to the power lamp of the electronic control unit ECU output end, test signal lamp, burning matter signal lamp, heating signal lamp
With demarcation signal lamp, light prompt is carried out for each working condition to diagnostic device, to inform that diagnostic personnel is examined accordingly
Disconnected result.
As shown in Fig. 2, be below that specific diagnostic method is discussed in detail with the LSU4.9 wide oxygen sensor of BOSCH,
The following steps are included:
Step 1: open said supply unit, i.e., the power switch is closed, enable the electronic control unit ECU from
Said supply unit obtains electric energy, and the power lamp is lighted, and the oxygen sensor diagnostic device is prepared to enter into diagnostic work.
Step 2: the electronic control unit ECU receives the heating parameters of the heating component by the grafting harness, pass through
Processing forms the adding thermal resistance value detected value of the lambda sensor, and the heating with the electronic control unit ECU storage inside
Resistance normal value is compared, described when the adding thermal resistance value detected value is fallen into the range of the adding thermal resistance normal value
Electronic control unit ECU is shown by display or other modes, prompts the lambda sensor effective, into next step；The heating
When resistance value detected value is not fallen in the range of the adding thermal resistance normal value, the lambda sensor failure, detection terminates.
Step 3: what the ambient pressure signal and the ambient humidity sensor of the ambient pressure sensor detection detected
Ambient humidity signal is respectively sent to the electronic control unit ECU, and the electronic control unit ECU calculates oxygen according to the signal received
The atmosphere calibration factor test value of sensor, the electronic control unit ECU is by the atmosphere calibration factor test value and the atmosphere
Calibration factor standard value is compared, and the atmosphere calibration factor test value falls into the normal of the atmosphere calibration factor standard value
When range, the lambda sensor is effective, while the test signal lamp lights flashing, and enters in next step；The atmosphere calibration
When factor test value does not fall within the normal range (NR) of the atmosphere calibration factor standard value, the lambda sensor failure, detection terminates.
Step 4: the heater switch is closed, the lambda sensor is enable to obtain electric energy from the heating power supply, institute
It states lambda sensor to start to be heated, when the lambda sensor can be heated and be heated to normal temperature range, the oxygen is passed
The normal temperature range of sensor is 780 ± 5 DEG C, and the lambda sensor is effective, into next step；The lambda sensor cannot be added
Heat or when can be heated but cannot be heated to normal temperature range, judges the lambda sensor failure, the heating signal
Lamp is lighted, and detection terminates.
Step 5: the electronic control unit ECU judge the lambda sensor atmosphere calibration factor whether can adjust automatically,
The electronic control unit ECU determines that the atmosphere calibration factor of the lambda sensor cannot carry out automatically, then judges the lambda sensor
Failure, the demarcation signal lamp light flashing, and detection terminates；The electronic control unit ECU determines the atmosphere mark of the lambda sensor
Determining the factor can carry out automatically, and by the atmosphere calibration factor of the lambda sensor adjusted and the atmosphere calibration factor standard
Value is compared, when the atmosphere calibration factor adjusted falls into the normal range (NR) of the atmosphere calibration factor standard value, institute
Stating electronic control unit ECU prompts the lambda sensor function normal, and test terminates；Otherwise enter in next step, the oxygen is activated to sense
The burning matter function of device；
Step 6: the lambda sensor, which is continued heating, burns matter, until burning matter temperature, the burning matter temperature range is 800
~900 DEG C, and 45~80s is maintained, the burning matter signal lamp is lighted, and step 3 is then return to, and obtains burning the oxygen after matter
The secondary atmosphere calibration factor of sensor, is compared by the electronic control unit ECU, the calibration of the secondary atmosphere of the lambda sensor because
When son falls into the normal range (NR) of the atmosphere calibration factor standard value, the electronic control unit ECU determines that the lambda sensor is final
Effectively；Otherwise the electronic control unit ECU determines that the lambda sensor ultimate failure, the demarcation signal lamp light flashing, detects
Terminate.
The invention has the following advantages:
1, by the diagnostic device and diagnostic method, can directly judge whether suspected malfunctions lambda sensor function is effective.
2, lambda sensor find in the detection process part be it is effective, can be continued to use by self-adjusting, thus saving
The process that this part lambda sensor is sent to producer's detection, has saved time and cost.
3, the failure False Rate of lambda sensor is greatly reduced, and easy to operate, it is easy to use, it has saved enterprise's maintenance and has protected
Feeding cost.
The above shows and describes the basic principle, main features and advantages of the invention.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (8)
1. a kind of oxygen sensor diagnostic device, connect with lambda sensor, it is characterised in that: pass through grafting including the lambda sensor
The atmosphere calibration factor of the lambda sensor is prestored in the electronic control unit ECU, the electronic control unit ECU that harness is detachably connected
The adding thermal resistance normal value of standard value and the lambda sensor, the input terminal of the electronic control unit ECU are connected with power supply unit, use
In the ambient pressure sensor for detecting the lambda sensor ambient pressure signal and for detecting the lambda sensor ambient humidity
The output end of the ambient humidity sensor of signal, the electronic control unit ECU is connected with diagnostic result prompt unit.
2. a kind of oxygen sensor diagnostic device as described in claim 1, it is characterised in that: said supply unit includes direct current
Source, the anode and cathode of the DC power supply pass through conducting wire respectively and are connected to the electronic control unit ECU, with the DC power supply
Power switch and fuse have been sequentially connected in series on the conducting wire of anode connection.
3. a kind of oxygen sensor diagnostic device as described in claim 1, it is characterised in that: the atmosphere calibration factor standard value
Range be 1 ± 0.05；The range of the adding thermal resistance normal value is 3.2 ± 0.8 Ω.
4. a kind of oxygen sensor diagnostic device as described in claim 1, it is characterised in that: the lambda sensor is equipped with oxygen sense
Pin, semifixed resistor pin, heating power supply anode pin, heating power supply negative pin, virtual ground pin and pump electric current is answered to draw
Foot, the oxygen induction pin connect aerobic inductive component, and the semifixed resistor pin is connected with heating component, the heating power supply
Positive pin is connected to the anode of heating power supply, and the heating power supply negative pin is connected to the cathode of the heating power supply, institute
It states and is serially connected with heater switch between heating power supply anode pin and the anode of the heating power supply, the virtual ground pin ground connection
Setting, the pump current legs are connected with pressure-applying unit.
5. a kind of oxygen sensor diagnostic device as claimed in claim 4, it is characterised in that: the diagnostic result prompt unit packet
Include be connected to the electronic control unit ECU output end power lamp, test signal lamp, burn matter signal lamp, heating signal lamp and
Demarcation signal lamp.
6. a kind of diagnostic method of oxygen sensor diagnostic device as claimed in claim 5, it is characterised in that: including following step
It is rapid:
Step 1: opening said supply unit, the electronic control unit ECU is enable to obtain electric energy from said supply unit, it is described
Power lamp is lighted, and the oxygen sensor diagnostic device is prepared to enter into diagnostic work；
Step 2: the electronic control unit ECU receives the heating parameters of the heating component by the grafting harness, by processing
Form the adding thermal resistance value detected value of the lambda sensor, and the adding thermal resistance with the electronic control unit ECU storage inside
Normal value is compared, and when the adding thermal resistance value detected value is fallen into the range of the adding thermal resistance normal value, the oxygen is passed
Sensor is effective, into next step；Otherwise the lambda sensor failure, detection terminate；
Step 3: the ambient pressure signal of the ambient pressure sensor detection and the environment of ambient humidity sensor detection
Moisture signal is respectively sent to the electronic control unit ECU, and the electronic control unit ECU calculates oxygen according to the signal received and senses
The atmosphere calibration factor test value of device, the electronic control unit ECU demarcate the atmosphere calibration factor test value and the atmosphere
Factor standard value is compared, and the atmosphere calibration factor test value falls into the normal range (NR) of the atmosphere calibration factor standard value
When, the lambda sensor is effective, while the test signal lamp lights flashing, and enters in next step；Otherwise the lambda sensor
Failure, detection terminate；
Step 4: the heater switch is closed, the lambda sensor is enable to obtain electric energy, the oxygen from the heating power supply
Sensor starts to be heated, when the lambda sensor can be heated and be heated to normal temperature range, the lambda sensor
Effectively, into next step；When the lambda sensor cannot be heated or can be heated but cannot be heated to normal temperature range,
Judge the lambda sensor failure, the heating signal lamp is lighted, and detection terminates；
Step 5: the electronic control unit ECU judge the lambda sensor atmosphere calibration factor whether can adjust automatically, it is described
Electronic control unit ECU determines that the atmosphere calibration factor of the lambda sensor cannot carry out automatically, then judges the lambda sensor failure,
The demarcation signal lamp lights flashing, and detection terminates；The electronic control unit ECU determines the atmosphere calibration factor of the lambda sensor
It can carry out automatically, and the atmosphere calibration factor of the lambda sensor adjusted and the atmosphere calibration factor standard value are carried out
Compare, when the atmosphere calibration factor adjusted falls into the normal range (NR) of the atmosphere calibration factor standard value, the oxygen is passed
Sensor function is normal, and test terminates；Otherwise enter in next step, activate the burning matter function of the lambda sensor；
Step 6: the lambda sensor, which is continued heating, burns matter, until burning matter temperature, and 45~80s, the burning matter signal are maintained
Lamp is lighted, and step 3 is then return to, and is obtained the secondary atmosphere calibration factor for burning the lambda sensor after matter, is passed through the electricity
Control unit ECU compares, and the secondary atmosphere calibration factor of the lambda sensor falls into the normal of the atmosphere calibration factor standard value
When range, the electronic control unit ECU determines that the lambda sensor is finally effective；Otherwise the electronic control unit ECU determines the oxygen
Sensor ultimate failure, the demarcation signal lamp light flashing, and detection terminates.
7. a kind of diagnostic method of oxygen sensor diagnostic device as claimed in claim 6, it is characterised in that: the lambda sensor
Normal temperature range be 780 ± 5 DEG C.
8. a kind of diagnostic method of oxygen sensor diagnostic device as claimed in claim 6, it is characterised in that: the burning matter temperature
Range is 800~900 DEG C.
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| CN201811199690.2A CN109061073A (en) | 2018-10-16 | 2018-10-16 | A kind of oxygen sensor diagnostic device and its diagnostic method |
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| CN201811199690.2A CN109061073A (en) | 2018-10-16 | 2018-10-16 | A kind of oxygen sensor diagnostic device and its diagnostic method |
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| CN110045064A (en) * | 2019-04-18 | 2019-07-23 | 巩诚电装（重庆）有限公司 | A kind of heating device for lambda sensor impedance detection |
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| CN111693653A (en) * | 2020-06-29 | 2020-09-22 | 潍柴动力股份有限公司 | Atmospheric calibration method, atmospheric calibration device and atmospheric calibration system of oxygen sensor |
| CN112326734A (en) * | 2020-09-22 | 2021-02-05 | 凯晟动力技术（嘉兴）有限公司 | Method for detecting cracks of zirconium piece of oxygen sensor |
| CN114967785A (en) * | 2021-08-13 | 2022-08-30 | 长城汽车股份有限公司 | Method and device for controlling heating of oxygen sensor, electronic equipment and storage medium |
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Cited By (5)
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| CN110045064A (en) * | 2019-04-18 | 2019-07-23 | 巩诚电装（重庆）有限公司 | A kind of heating device for lambda sensor impedance detection |
| CN110530643A (en) * | 2019-09-26 | 2019-12-03 | 潍柴西港新能源动力有限公司 | The system and method for natural gas engine multifunctional testing |
| CN111693653A (en) * | 2020-06-29 | 2020-09-22 | 潍柴动力股份有限公司 | Atmospheric calibration method, atmospheric calibration device and atmospheric calibration system of oxygen sensor |
| CN112326734A (en) * | 2020-09-22 | 2021-02-05 | 凯晟动力技术（嘉兴）有限公司 | Method for detecting cracks of zirconium piece of oxygen sensor |
| CN114967785A (en) * | 2021-08-13 | 2022-08-30 | 长城汽车股份有限公司 | Method and device for controlling heating of oxygen sensor, electronic equipment and storage medium |
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