CN106198622B - A kind of lambda sensor dew-point detecting device and detection method - Google Patents
A kind of lambda sensor dew-point detecting device and detection method Download PDFInfo
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- CN106198622B CN106198622B CN201610673988.7A CN201610673988A CN106198622B CN 106198622 B CN106198622 B CN 106198622B CN 201610673988 A CN201610673988 A CN 201610673988A CN 106198622 B CN106198622 B CN 106198622B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/56—Investigating or analyzing materials by the use of thermal means by investigating moisture content
- G01N25/66—Investigating or analyzing materials by the use of thermal means by investigating moisture content by investigating dew-point
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- Combined Controls Of Internal Combustion Engines (AREA)
- Measuring Oxygen Concentration In Cells (AREA)
Abstract
The invention discloses a kind of lambda sensor dew-point detecting device and detection methods, include on exhaust pipe and induction end extend into the lambda sensor inside the exhaust pipe, it closes on the exhaust pipe of the lambda sensor and the temperature sensor that induction end is extend into inside the exhaust pipe is installed, the lambda sensor is connected with controller, and the data output end of the temperature sensor is connect with the controller；According to the detection of temperature sensor, after temperature is more than certain numerical value near lambda sensor, then lambda sensor is made to work normally.The present invention can rapidly and accurately determine whether to detect by dew point, and whether lambda sensor can work normally, and not influenced by engine configuration and working environment；It can reduce after natural gas engine starts to the opened loop control time between lambda sensor normal work, improve the economy and emission performance of natural gas engine.
Description
Technical field
The present invention relates to technical field of engines more particularly to a kind of lambda sensor dew-point detecting device and methods.
Background technology
Natural gas engine measures the oxygen content in tailpipe usually using lambda sensor, to carry out closed-loop control.
The core element of lambda sensor is porous zirconia ceramics pipe.Lambda sensor needs to heat zirconia ceramics pipe at work
To 750~780 DEG C or so.Because containing a large amount of vapor in natural gas engine emission.When natural gas engine is rigid
When startup, the vapor in tail gas can condense into liquid water because contacting the exhaust pipe under low-temperature condition at this time.If there is liquid water
It splashes on ceramic tube, will result in ceramic tube and burst, and then damage lambda sensor.So when lambda sensor is nearby vented tube temperature
Spending can just be such that lambda sensor works normally more than after certain temperature (it is generally acknowledged that this temperature is dew-point temperature).Lambda sensor cannot
When normal work, engine can only operate under open loop situations, and the economy of engine, emission performance can all deteriorate.
It is protection lambda sensor at this stage, it is general to postpone to make oxygen again for a period of time after the engine started using scaling method
Normal operation of sensor.Calibration process is extremely complex very long caused by engine configuration, working environment are very various, and demarcates
As a result also inaccurate.
Natural gas engine measures the oxygen content in tailpipe usually using lambda sensor, to carry out closed-loop control.
In order to protect lambda sensor, need again to start after there is no liquid water around confirmation lambda sensor after natural gas engine startup
Work.Judge that the method whether lambda sensor starts to work is that lambda sensor crosses dew point detection method, typically now using combustion
The method of gas energy integral determines the delay time worked normally from engine start to lambda sensor.This method passes through calculating
Whether the heat estimation lambda sensor sent out that burns crosses dew point.It is calibrated caused by engine configuration, working environment are very various
Journey is extremely complex very long, and calibration result is also inaccurate.
Invention content
A technical problem to be solved by this invention is to provide the accurate lambda sensor dew of a kind of simple in structure and detection
Point detection device.
In order to solve the above technical problems, the technical scheme is that：A kind of lambda sensor dew-point detecting device, including peace
On exhaust pipe and induction end extend into the lambda sensor inside the exhaust pipe, closes on the exhaust of the lambda sensor
The temperature sensor that induction end is extend into inside the exhaust pipe is installed, the lambda sensor is connected with controller, institute on pipe
The data output end for stating temperature sensor is connect with the controller；The controller includes engine start detection unit, temperature
Degree Transducer fault detection unit, lambda sensor cross dew-point temperature calculating unit and lambda sensor crosses dew point time calculating unit.
As a kind of perferred technical scheme, oxygen sensor seat, the lambda sensor installation are installed on the exhaust pipe
On the lambda sensor seat.
As a kind of perferred technical scheme, block temperature sensor, the temperature sensor are installed on the exhaust pipe
Temperature sensor is installed on seat, the compression dress that the temperature sensor is fixed is installed on the block temperature sensor
It sets.
As a kind of perferred technical scheme, the pressing device include be sleeved on the temperature sensor and with it is described
The T-type briquetting that block temperature sensor is threadedly coupled.
As a kind of perferred technical scheme, the length that the temperature sensor senses end is extend into the exhaust pipe is wanted
The length being extend into less than the lambda sensor induction end in the exhaust pipe.
As a kind of perferred technical scheme, the controller includes microcontroller.
By adopting the above-described technical solution, a kind of lambda sensor dew-point detecting device, including be mounted on exhaust pipe and
Induction end extend into the lambda sensor inside the exhaust pipe, closes on the exhaust pipe of the lambda sensor and is equipped with induction
End extend into the temperature sensor inside the exhaust pipe, and the lambda sensor is connected with controller, the temperature sensor
Data output end is connect with the controller；According to the detection of temperature sensor, temperature is more than a fixed number near lambda sensor
After value, then lambda sensor is made to work normally.The present invention can accurately detect lambda sensor and spend the dew point moment, not by engine configuration
And the influence of working environment.
Another technical problem to be solved by this invention is to provide a kind of detection accurate lambda sensor dew point detection side
Method.
In order to solve the above technical problems, the technical scheme is that：A kind of lambda sensor dew point detection method, including under
State step：
Step 1 starts engine, and after controller detects engine start, detection temperature sensor is with the presence or absence of event
Barrier；
Step 2, if temperature sensor in order, carries out lambda sensor dew-point temperature and calculates work；If temperature
Sensor breaks down, then carries out lambda sensor dew point time evaluation work；
Step 3, if temperature sensor is more than dew-point temperature or time since engine start crosses dew point more than lambda sensor
Time then starts lambda sensor work.
As a kind of perferred technical scheme, in above-mentioned steps two, under the lambda sensor dew-point temperature calculating includes
State step：
Step 1 obtains lambda sensor nearby temperature and environment temperature；
Step 2, being tabled look-up according to environment temperature obtains lambda sensor and crosses dew-point temperature, while according to warm near lambda sensor
The difference of degree and environment temperature, which is tabled look-up, obtains temperature correction coefficient；
Lambda sensor is crossed dew-point temperature and is multiplied with temperature correction coefficient to obtain and revised crosses dew-point temperature by step 3；
Step 4, whether the last Current Temperatures of detection in real time reached dew-point temperature, if Current Temperatures are greater than or equal to
It is revised to cross dew-point temperature, start lambda sensor work, otherwise continues waiting for.
As a kind of perferred technical scheme, in above-mentioned steps two, under the lambda sensor dew point time calculating includes
State step：
Step 1 reports and submits temperature sensor fault, lights malfunction indicator lamp；
Step 2, according to environment temperature table look-up obtain lambda sensor spend the dew point time；
Step 3 starts lambda sensor if time since engine start spends the dew point time more than or equal to lambda sensor
Work, if time since engine start spends the dew point time less than lambda sensor, continues waiting for.
By adopting the above-described technical solution, a kind of lambda sensor dew point detection method, includes the following steps：Step 1,
Start engine, after controller detects engine start, detection temperature sensor whether there is failure；Step 2, if warm
It is good to spend sensor condition, then carries out lambda sensor dew-point temperature and calculates work；If temperature sensor breaks down, carry out
Lambda sensor dew point time evaluation work；Step 3, if temperature sensor is more than dew-point temperature or time since engine start
The dew point time is spent more than lambda sensor, then starts lambda sensor work；The present invention can rapidly and accurately determine whether to pass through dew
Whether point detection, lambda sensor can work normally；It can reduce and be worked normally to lambda sensor after natural gas engine starts
Between the opened loop control time, improve the economy and emission performance of natural gas engine.
Description of the drawings
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 schematic diagram of the embodiment of the present invention；
Fig. 2 is work flow diagram of the embodiment of the present invention；
In figure：1- exhaust pipes；21- lambda sensors；22- lambda sensor seats；31- temperature sensors；32- temperature sensors
Seat；33-T type briquettings.
Specific implementation mode
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 present invention.Undoubtedly, those skilled in the art will recognize,
In the case of without departing from the spirit and scope of the present invention, described embodiment can be repaiied 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 lambda sensor dew-point detecting device, including it is mounted on exhaust pipe 1 and induction end is extend into
Lambda sensor 21 inside the exhaust pipe 1, installation oxygen sensor seat 22 on the exhaust pipe 1, the lambda sensor 21 is pacified
On the lambda sensor seat 22, close on induction end being installed on the exhaust pipe 1 of the lambda sensor 21 extend into institute
The temperature sensor 31 inside exhaust pipe 1 is stated, block temperature sensor 32, the temperature sensor are installed on the exhaust pipe 1
Temperature sensor 31 is installed on seat 32, is equipped on the block temperature sensor 32 and is fixed the temperature sensor 31
Pressing device, the pressing device include be sleeved on the temperature sensor 31 and with 32 screw thread of the block temperature sensor
The T-type briquetting 33 of connection, the length that 31 induction end of the temperature sensor is extend into the exhaust pipe 1 are less than the oxygen and pass
21 induction end of sensor extend into the length in the exhaust pipe 1.The lambda sensor 21 is connected with controller (not shown),
The controller includes microcontroller, and the data output end of the temperature sensor 31 is connect with the controller, the controller
Dew-point temperature, which is crossed, including engine start detection unit, 31 fault detection unit of temperature sensor, lambda sensor 21 calculates unit
Dew point time calculating unit is crossed with lambda sensor 21.
Lambda sensor seat 22 and block temperature sensor 32 are separately mounted on exhaust pipe 1.Under normal circumstances according to exhaust pipe 1
Middle tail gas direction, block temperature sensor 32 is in upstream, lambda sensor seat 22 in downstream, and block temperature sensor 32 need to be passed apart from oxygen
Sensor seat 22 is close as possible.Lambda sensor 21 is installed on by threaded connection on lambda sensor seat 22.Temperature sensor 31 relies on T-type pressure
Block 33 is installed on block temperature sensor 32, and temperature sensor 31 probe into exhaust pipe 1 depth it is short as far as possible, Bu Nengchao
It crosses lambda sensor 21 and probes into depth.After natural gas engine starts, rich steam-laden tail gas flows through cryopumping pipe 1, and oxygen passes
Sensor 21, temperature sensor 31 nearby can all have the liquid water of condensation, such case more notable in cold district.Temperature sensing
Device 31 detects the temperature near lambda sensor 21 in real time, and temperature generally will appear first rapid increase, then slowly rise, then quickly
The process of rising, to form two temperature inflection points.After temperature is more than second inflection point, then it is assumed that pass through dew-point temperature, oxygen
Sensor 21 can start to work normally.According to the detection of temperature sensor 31, when nearby temperature is more than certain to lambda sensor 21
After numerical value, then lambda sensor 21 is made to work normally.The present invention can accurately detect lambda sensor 21 and spend the dew point moment, not started
Machine configures and the influence of working environment.
As shown in Fig. 2, a kind of 21 dew point detection method of lambda sensor, includes the following steps：
Step 1 starts engine, and after controller detects engine start, detection temperature sensor 31 is with the presence or absence of event
Barrier；
Step 2 carries out 21 dew-point temperature of lambda sensor and calculates work if temperature sensor 31 is in order；If
Temperature sensor 31 breaks down, then carries out 21 dew point time of lambda sensor evaluation work；
Step 3, if temperature sensor 31 is more than dew-point temperature or time since engine start is more than 21 mistake of lambda sensor
The dew point time then starts the work of lambda sensor 21.
In above-mentioned steps two, the calculating of 21 dew-point temperature of the lambda sensor includes the following steps：
Step 1 obtains lambda sensor 21 nearby temperature and environment temperature；
Step 2 tables look-up according to environment temperature and obtains the dew-point temperature excessively of lambda sensor 21, while attached according to lambda sensor 21
The difference of nearly temperature and environment temperature, which is tabled look-up, obtains temperature correction coefficient；
The dew-point temperature excessively of lambda sensor 21 is multiplied with temperature correction coefficient and obtains revised dew point temperature excessively by step 3
Degree；
Step 4, whether the last Current Temperatures of detection in real time reached dew-point temperature, if Current Temperatures are greater than or equal to
It is revised to cross dew-point temperature, start lambda sensor 21 and work, otherwise continues waiting for.
In above-mentioned steps two, the calculating of 21 dew point time of the lambda sensor includes the following steps：
Step 1 reports and submits 31 failure of temperature sensor, lights malfunction indicator lamp；
Step 2 tables look-up according to environment temperature and obtains the dew point time excessively of lambda sensor 21；
Step 3 starts oxygen sensing if time since engine start is greater than or equal to lambda sensor 21 and spends the dew point time
Device 21 works, if time since engine start is less than lambda sensor 21 and spends the dew point time, continues waiting for.
This detection method based on detecting system include engine start detection unit, 31 fault detect list of temperature sensor
Member, lambda sensor 21 cross dew-point temperature calculating unit, lambda sensor 21 crosses dew point time calculating unit, 21 job note of lambda sensor
Member composition.Implementation steps of the present invention are as follows, and engine start detection unit detects engine start state in real time first, when starting
Machine enters 31 fault detection unit of temperature sensor after starting successfully, detection temperature sensor 31 is with the presence or absence of short circuit or open circuit
Failure, cross dew-point temperature without entering lambda sensor 21 if failure if temperature sensor 31 and calculate unit；If temperature passes
The faulty lambda sensor 21 that then enters of sensor 31 crosses dew point time calculating unit.Dew-point temperature, which is crossed, in lambda sensor 21 calculates unit
In, the temperature and environment temperature near the lambda sensor 21 that temperature sensor 31 acquires are obtained first.Due to environment temperature difference
When, the amount of condensed water is inconsistent in exhaust pipe 1, so different mistake dew-point temperatures need to be demarcated according to environment temperature.Work as hair
For motivation when parking is again started up engine shortly after, 21 temperature of lambda sensor that temperature sensor 31 measures can compare environment temperature
Height, according to lambda sensor 21, nearby the difference of temperature and environment temperature demarcates temperature correction coefficient.Then by temperature correction coefficient
It was multiplied by dew-point temperature and obtains the dew-point temperature excessively of revised lambda sensor 21, whether the last Current Temperatures of detection in real time reached
Dew-point temperature.It is crossed in dew point time calculating unit in lambda sensor 21, the error code of temperature sensor 31, point is reported and submitted to expose first
The malfunction indicator lamp answered.It reminds user temperature sensor 31 to have occurred that failure, needs repairing.Then it is obtained according to environment temperature
Lambda sensor 21 is taken to spend the delay time of dew point.When whether the last startup time of detection in real time crosses dew point more than lambda sensor 21
Between.After Current Temperatures reached dew-point temperature or started the time more than the dew point time of lambda sensor 21, into lambda sensor
21 working cells.Control 21 rapid heating ceramic pipe of lambda sensor normal work.
The present invention can rapidly and accurately determine whether to detect by dew point, and whether lambda sensor 21 can work normally；
It can reduce after natural gas engine starts to the opened loop control time between the normal work of lambda sensor 21, improve natural gas hair
The economy and emission performance of motivation.
The basic principles and main features and advantages of the present invention of the present invention have been shown and described above.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 (9)
1. a kind of lambda sensor dew-point detecting device, including it is mounted on exhaust pipe and induction end is extend into inside the exhaust pipe
Lambda sensor, it is characterised in that：It closes on and induction end is installed on the exhaust pipe of the lambda sensor extend into the row
The temperature sensor of pipe, the lambda sensor are connected with controller, the data output end of the temperature sensor and institute
State controller connection；
The controller includes that engine start detection unit, temperature sensor fault detection unit, lambda sensor cross dew point temperature
Degree computing unit and lambda sensor cross dew point time calculating unit.
2. lambda sensor dew-point detecting device as described in claim 1, it is characterised in that：Aerobic biography is installed on the exhaust pipe
Sensor seat, the lambda sensor are mounted on the lambda sensor seat.
3. lambda sensor dew-point detecting device as described in claim 1, it is characterised in that：Temperature is installed on the exhaust pipe
Sensor holder is equipped with temperature sensor on the block temperature sensor, is equipped on the block temperature sensor by the temperature
The pressing device that degree sensor is fixed.
4. lambda sensor dew-point detecting device as claimed in claim 3, it is characterised in that：The pressing device includes being sleeved on
The T-type briquetting being threadedly coupled on the temperature sensor and with the block temperature sensor.
5. lambda sensor dew-point detecting device as described in claim 1, it is characterised in that：It stretches at the temperature sensor senses end
Enter to the length in the exhaust pipe and is less than the length that the lambda sensor induction end is extend into the exhaust pipe.
6. lambda sensor dew-point detecting device as described in claim 1, it is characterised in that：The controller includes microcontroller.
7. the detection method based on lambda sensor dew-point detecting device described in claim 1, which is characterized in that including following steps
Suddenly：
Step 1 starts engine, and after controller detects engine start, detection temperature sensor whether there is failure；
Step 2, if temperature sensor in order, carries out lambda sensor dew-point temperature and calculates work；If temperature sensing
Device breaks down, then carries out lambda sensor dew point time evaluation work；
Step 3, if temperature sensor crosses dew point more than dew-point temperature or time since engine start more than lambda sensor
Between, then start lambda sensor work.
8. detection method as claimed in claim 7, which is characterized in that in above-mentioned steps two, the lambda sensor dew point temperature
Degree, which calculates, to be included the following steps：
Step 1 obtains lambda sensor nearby temperature and environment temperature；
Step 2, being tabled look-up according to environment temperature obtains lambda sensor and crosses dew-point temperature, at the same according to temperature near lambda sensor and
The difference of environment temperature, which is tabled look-up, obtains temperature correction coefficient；
Lambda sensor is crossed dew-point temperature and is multiplied with temperature correction coefficient to obtain and revised crosses dew-point temperature by step 3；
Whether step 4, the last Current Temperatures of detection in real time reached dew-point temperature, were corrected if Current Temperatures are greater than or equal to
Mistake dew-point temperature afterwards starts lambda sensor work, otherwise continues waiting for.
9. detection method as claimed in claim 7, which is characterized in that in above-mentioned steps two, when the lambda sensor dew point
Between calculate and include the following steps：
Step 1 reports and submits temperature sensor fault, lights malfunction indicator lamp；
Step 2, according to environment temperature table look-up obtain lambda sensor spend the dew point time；
Step 3 starts lambda sensor work if time since engine start spends the dew point time more than or equal to lambda sensor,
If time since engine start spends the dew point time less than lambda sensor, continue waiting for.
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| CN201610673988.7A CN106198622B (en) | 2016-08-15 | 2016-08-15 | A kind of lambda sensor dew-point detecting device and detection method |
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| CN201610673988.7A CN106198622B (en) | 2016-08-15 | 2016-08-15 | A kind of lambda sensor dew-point detecting device and detection method |
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| CN106198622B true CN106198622B (en) | 2018-11-13 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| FR3066544B1 (en) * | 2017-05-17 | 2019-06-21 | Peugeot Citroen Automobiles Sa | METHOD FOR DETERMINING THE PASSAGE TO THE STATE WITHOUT PRESENCE OF LIQUID WATER IN AN EXHAUST LINE |
| CN107575291B (en) * | 2017-10-25 | 2019-10-08 | 重庆长安汽车股份有限公司 | The detection method of resistance to water drenching risk under oxygen sensor used in vehicle vehicle environment |
| CN108547689B (en) * | 2018-03-07 | 2020-09-29 | 潍柴动力股份有限公司 | Vehicle control method and control device and vehicle |
| CN109441602B (en) * | 2018-12-18 | 2023-09-29 | 东风商用车有限公司 | Device for accurately measuring dew point temperature of NOx sensor and measuring method thereof |
| CN112307812B (en) * | 2019-07-26 | 2024-02-27 | 联合汽车电子有限公司 | Method, system, exhaust system and readable storage medium for identifying effective thermocouple |
| CN111693653B (en) * | 2020-06-29 | 2023-01-24 | 潍柴动力股份有限公司 | Atmospheric calibration method, atmospheric calibration device and atmospheric calibration system of oxygen sensor |
| CN115165965A (en) * | 2022-04-07 | 2022-10-11 | 联合汽车电子有限公司 | GPF over dew point detection method and system |
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| EP1959121B1 (en) * | 2007-02-14 | 2009-08-19 | Ford Global Technologies, LLC | Sensor activation monitor |
| US8079351B2 (en) * | 2008-01-10 | 2011-12-20 | Ford Global Technologies, Llc | Temperature sensor diagnostics |
| DE102009027374A1 (en) * | 2009-07-01 | 2011-01-05 | Robert Bosch Gmbh | Exhaust gas sensor device, engine control device and method |
| CN104279036B (en) * | 2014-09-01 | 2016-10-19 | 潍柴动力股份有限公司 | A kind of broad domain oxygen sensor fault detection method and device |
| CN205941425U (en) * | 2016-08-15 | 2017-02-08 | 潍柴西港新能源动力有限公司 | Oxygen sensor dew point detection device |
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