CN104895686B - Determine the method and system of the oxygen concentration of engine exhaust - Google Patents
Determine the method and system of the oxygen concentration of engine exhaust Download PDFInfo
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- CN104895686B CN104895686B CN201510229236.7A CN201510229236A CN104895686B CN 104895686 B CN104895686 B CN 104895686B CN 201510229236 A CN201510229236 A CN 201510229236A CN 104895686 B CN104895686 B CN 104895686B
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Abstract
The method that the present invention discloses the oxygen concentration for determining engine exhaust, first with total air-mass flow of the discharge capacity account engine of the charging efficiency of engine, the rotating speed of engine and engine, afterwards using the temperature for the air for entering engine, into engine waste gas temperature, into engine the temperature of mixed gas and total mass air flow meter of engine add the mass flow of air into engine and enter engine waste gas mass flow, the oxygen concentration of engine exhaust is assured that based on aforementioned data afterwards.The method of the oxygen concentration disclosed by the invention for determining engine exhaust, can quickly determine the oxygen concentration in engine exhaust after the start of engine, and very low to the sensitiveness of pipeline structure, so as to reduce the requirement to engine pipelines layout.The invention also discloses the system for the oxygen concentration for determining engine exhaust.
Description
Technical field
The invention belongs to gas detection technology field, more particularly to determine the method for the oxygen concentration of engine exhaust and be
System.
Background technology
Motor vehicle can discharge substantial amounts of nitrogen oxides (such as NO and NO2) in the process of running, and nitrogen oxides is in rich, high temperature
Generated under the conditions of oxygen.In order to reduce the content of nitrogen oxides in automobile exhausting, occurs waste gas recycling (EGR) system at present
System：The portion of engine emission is imported in the air inlet pipeline of engine, waste gas enters engine after being mixed with air
Cylinder in, the temperature and oxygen content in cylinder can be reduced, so as to reduce the content of nox in exhaust.
In order to ensure the power performance of engine, appropriate waste gas is controlled to participate in recycling.And determine to participate in recycling
The process of exhausted air quantity need the oxygen content based on engine exhaust to realize.The oxygen content master of detection engine exhaust at present
Will be in the following ways：One, oxygen concentration sensor is installed additional on waste pipe, by oxygen concentration sensor come real
When measure waste gas in oxygen concentration；Two, install oxygen concentration sensor additional in the air inlet pipe of engine, passed by oxygen concentration
The oxygen concentration measured value of sensor and the distributive value of engine calculate the oxygen concentration in waste gas.
But in above-mentioned detection engine exhaust there is drawback in the mode of oxygen concentration：Oxygen concentration sensor only exists
Measured oxygen concentration can be just carried out after itself being heated to 700 DEG C or so, therefore, is first had to after motor vehicle starting to oxygen
Gas concentration sensor is preheated (being usually 5 to 10 minutes), can just be carried out measured oxygen concentration afterwards, be measured time
It is long.
The content of the invention
In view of this, it is an object of the invention to provide it is a kind of determine engine exhaust oxygen concentration method and be
System, the oxygen concentration in can quickly determining engine exhaust after motor vehicle starting.
To achieve the above object, the present invention provides following technical scheme：
The present invention discloses a kind of method for the oxygen concentration for determining engine exhaust, including：
Total air mass stream of engine is calculated using the charging efficiency of engine, the rotating speed of engine and engine displacement
Amount；
Temperature of the detection into the air of engine, the temperature of the waste gas into engine and the gaseous mixture for entering engine
The temperature of body；
Utilize the temperature for the air for entering engine, the temperature of waste gas into engine, the gaseous mixture into engine
The temperature of body and total air-mass flow of engine, calculate the mass flow for the air for entering engine and enter engine
The mass flow of waste gas；
Utilize formulaCurrent time is calculated into the mixed gas of engine
Oxygen concentration, wherein, m1To enter the mass flow of the air of engine, m2To enter the quality stream of the waste gas of engine
Amount, m3For total air-mass flow of engine,For the oxygen concentration in air,Head after engine unlatching
Secondary calculating process is configured as initial value, and the last engine exhaust being calculated is configured as in follow-up calculating process
Oxygen concentration；
Utilize formulaCalculate the oxygen concentration of engine exhaust, wherein, F is quilt
The amount of oxygen that the fuel consumption of cylinder injection is fallen.
Preferably, always entering for engine is calculated using the charging efficiency of engine, the rotating speed of engine and engine displacement
Gas mass flow, including：
Utilize formula m3=K*Neng/2*VengCalculate total air-mass flow m of engine3, wherein, K is filling for engine
Gas efficiency, NengFor the rotating speed of engine, VengFor engine displacement.
Preferably, using the temperature for the air for entering engine, into engine waste gas temperature, into engine
The temperature of mixed gas and total air-mass flow of engine, calculate the mass flow for the air for entering engine and enter hair
The mass flow of the waste gas of motivation, including：
Utilize formulaCalculate the mass flow into the air of engine
m1；
Utilize formulaCalculate the mass flow into the waste gas of engine
m2；
Wherein, C1For the specific heat capacity of air, C2For the specific heat capacity of waste gas, C3To enter the specific heat of the mixed gas of engine
Hold, T1To enter the temperature of the air of engine, T2To enter the temperature of the waste gas of engine, T3To enter the mixing of engine
The temperature of gas.
Preferably, detection is into the temperature of air of engine：Detection is in the air inlet pipe after air cleaner
Air temperature.
Preferably, detection is into the temperature of waste gas of engine：Detect the temperature of EGR exhaust recycle valve outlet.
Invention additionally discloses a kind of system for the oxygen concentration for determining engine exhaust, including the first temperature sensor, the
Two temperature sensors, three-temperature sensor and processor；
First temperature sensor is used to detect the temperature into the air of engine；
The second temperature sensor is used to detect the temperature into the waste gas of engine；
The three-temperature sensor is used to detect the temperature into the mixed gas of engine；
The processor connects with first temperature sensor, second temperature sensor and three-temperature sensor respectively
Connect, the processor is used for the oxygen concentration for calculating engine exhaust, specifically includes：
Total air mass stream of engine is calculated using the charging efficiency of engine, the rotating speed of engine and engine displacement
Amount；Using the temperature of the air of engine, into engine waste gas temperature, into engine mixed gas temperature and
Total air-mass flow of engine, calculate the mass flow into the air of engine and the quality of the waste gas into engine
Flow；Utilize formulaCurrent time is calculated into the oxygen of the mixed gas of engine
Gas concentration, wherein, m1To enter the mass flow of the air of engine, m2To enter the quality stream of the waste gas of engine
Amount, m3For total air-mass flow of engine,For the oxygen concentration in air,Head after engine unlatching
Secondary calculating process is configured as initial value, and the last engine exhaust being calculated is configured as in follow-up calculating process
Oxygen concentration；Utilize formulaCalculate the oxygen concentration of engine exhaust, wherein, F is quilt
The amount of oxygen that the fuel consumption of cylinder injection is fallen.
Preferably, the detection probe of first temperature sensor is arranged in the air inlet pipe after cleaner.
Preferably, the detection probe of the second temperature sensor is arranged at the exit of EGR exhaust recycle valve.
Preferably, the detection probe of the three-temperature sensor is arranged at the air inlet of the engine.
Preferably, the first temperature sensor, second temperature sensor and the three-temperature sensor are thermistor-type
Temperature sensor.
As can be seen here, beneficial effects of the present invention are：
It is disclosed by the invention determine engine exhaust oxygen concentration method, first with the charging efficiency of engine,
Total air-mass flow of the rotating speed of engine and the discharge capacity account engine of engine, the air into engine is utilized afterwards
Temperature, into engine waste gas temperature, into engine mixed gas temperature and engine always enter makings
Flow rate calculation is measured into the mass flow of the air of engine and the mass flow for the waste gas for entering engine, afterwards based on foregoing
Data are assured that the oxygen concentration of engine exhaust.The side of the oxygen concentration disclosed by the invention for determining engine exhaust
Method, the detection data used only include three temperature values, because temperature sensor can carry out temperature detection, therefore base at any time
In method disclosed by the invention, the oxygen concentration in engine exhaust can be quickly determined after the start of engine.In addition, by
It is very low in the sensitiveness that temperature sensor changes for air-flow, even if air-flow is unstable still to be able to accurate detection temperature, therefore, this
The method of disclosure of the invention is very low to the sensitiveness of pipeline structure, so as to reduce the requirement to engine pipelines layout.
The system of the oxygen concentration disclosed by the invention for determining engine exhaust, entered by three temperature sensor detections
The temperature of the air of engine, into engine waste gas temperature, into engine mixed gas temperature, processor profit
With total air-mass flow of the discharge capacity account engine of the charging efficiency of engine, the rotating speed of engine and engine, afterwards
The total air-mass flow for detecting temperature value and engine based on three temperature sensors is assured that engine exhaust
Oxygen concentration.The system of the oxygen concentration disclosed by the invention for determining engine exhaust, the detection data used only include three
Individual temperature value, because temperature sensor can carry out temperature detection at any time, therefore system disclosed by the invention is based on, in engine
The oxygen concentration in engine exhaust can be quickly determined after startup.Further, since what temperature sensor changed for air-flow
Sensitiveness is very low, even if air-flow is unstable still to be able to accurate detection temperature, therefore, system disclosed by the invention is to pipeline structure
Sensitiveness is very low, so as to reduce the requirement to engine pipelines layout.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
The embodiment of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing of offer obtains other accompanying drawings.
Fig. 1 is a kind of flow chart of the method for oxygen concentration for determining engine exhaust disclosed by the invention；
Fig. 2 is a kind of structural representation of the system of oxygen concentration for determining engine exhaust disclosed by the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
The present invention discloses a kind of method for determining oxygen concentration in engine exhaust, can be opened based on this method in motor vehicle
The quick oxygen concentration determined in engine exhaust after dynamic.
Referring to Fig. 1, Fig. 1 is a kind of flow chart of the method for oxygen concentration for determining engine exhaust disclosed by the invention.
This method includes：
Step S1：Always entering for engine is calculated using the charging efficiency of engine, the rotating speed of engine and engine displacement
Gas mass flow.
The vehicle control unit controls EGR valve (can be magnetic valve) of motor vehicle is opened, and adjusts the aperture of EGR valves so that
The a part of of the waste gas of engine emission can be again introduced into the air inlet pipeline of engine, therefore, into the gas of engine
Both ozone had been included or including portion.
In implementation, formula 1 can be utilized to calculate total air-mass flow of engine.
m3=K*Neng/2*Veng(formula 1)
Wherein, m3For total air-mass flow of engine, K is the charging efficiency of engine, NengFor turning for engine
Speed, VengFor engine displacement.
Step S2：Temperature of the detection into the air of engine, the temperature of the waste gas into engine and into engine
Mixed gas temperature.
Three temperature sensors are set on the air inlet pipeline of engine, and one of temperature sensor is used to detect and entered
The temperature of the air of engine, another temperature sensor are used to detect the temperature into the waste gas of engine, the 3rd temperature
Sensor is used to detect the temperature into the mixed gas of engine.
Step S3：Calculate the mass flow into the air of engine and the mass flow of the waste gas into engine.
In implementation, using the temperature for the air for entering engine, into engine waste gas temperature, into engine
The temperature of mixed gas and total air-mass flow of engine, calculate the mass flow for the air for entering engine and enter hair
The mass flow of the waste gas of motivation.
Formula 2 can be obtained according to principle of heat balance：
C1*m1*T1+C2*m2*T2=C3*m3*T3(formula 2)
Wherein：
C1For the specific heat capacity of air；m1To enter the mass flow of the air of engine；T1To enter the air of engine
Temperature；C2For the specific heat capacity of waste gas；m2To enter the mass flow of the waste gas of engine；T2To enter the temperature of the waste gas of engine
Degree；C3To enter the specific heat capacity of the mixed gas of engine；m3For total air-mass flow of engine；T3For into engine
Mixed gas temperature.
In addition, formula 3 can be obtained according to the principle of mass conservation：
m1+m2=m3(formula 3)
According to formula 1, formula 2 and formula 3, you can calculate the mass flow m into the air of engine1And entrance
The mass flow m of the waste gas of engine2, specifically：
Step S4：Current time is calculated into the oxygen concentration of the mixed gas of engine.
In implementation, current time is calculated into the oxygen concentration of the mixed gas of engine using formula 4.
(formula 4)
Wherein,Enter the oxygen concentration of the mixed gas of engine, m for current time1To enter the sky of engine
The mass flow of gas, m2To enter the mass flow of the waste gas of engine, m3For total air-mass flow of engine,For
Oxygen concentration in air,Initial value is configured as in the calculating process first after engine unlatching, is subsequently being counted
Calculation process is configured as the oxygen concentration of the last engine exhaust being calculated.
Here in formula 4Value be described in detail：
After engine unlatching, if performing the operation for determining oxygen concentration in engine exhaust for the first time, also
It is to say to perform step S4 for the first time, then willInitial value is configured to, the initial value can be the oxygen concentration of air.If
Ith (i is the integer more than 1) performs step S4 after engine unlatching, then in ith calculating processConfiguration
For the oxygen concentration of the i-th -1 time engine exhaust being calculated.That is, used in step S4It is successive iteration
's.
Step S5：Calculate the oxygen concentration of engine exhaust.
In implementation, the oxygen concentration of engine exhaust is calculated using formula 5：
(formula 5)
Wherein,For the oxygen concentration of engine exhaust, F is the amount of oxygen fallen by the fuel consumption of cylinder injection, is
One calibration value.
It is disclosed by the invention determine engine exhaust oxygen concentration method, first with the charging efficiency of engine,
Total air-mass flow of the rotating speed of engine and the discharge capacity account engine of engine, the air into engine is utilized afterwards
Temperature, into engine waste gas temperature, into engine mixed gas temperature and engine always enter makings
Flow rate calculation is measured into the mass flow of the air of engine and the mass flow for the waste gas for entering engine, afterwards based on foregoing
Data are assured that the oxygen concentration of engine exhaust.The side of the oxygen concentration disclosed by the invention for determining engine exhaust
Method, the detection data used only include three temperature values, because temperature sensor can carry out temperature detection, therefore base at any time
In method disclosed by the invention, the oxygen concentration in engine exhaust can be quickly determined after the start of engine.In addition, by
It is very low in the sensitiveness that temperature sensor changes for air-flow, even if air-flow is unstable still to be able to accurate detection temperature, therefore, this
The method of disclosure of the invention is very low to the sensitiveness of pipeline structure, so as to reduce the requirement to engine pipelines layout.
Preferably, detection is configurable into the temperature of the air of engine：Detection is located at air cleaner
The temperature of the air in air inlet pipe afterwards.Air cleaner is arranged on the air inlet pipeline of engine, for starting to entering
The air of machine is filtered.
In addition, detection is configurable into the temperature of the waste gas of engine：Detect the temperature of EGR exhaust recycle valve outlet
Degree.
Invention additionally discloses it is a kind of determine engine exhaust oxygen concentration system, its structure as shown in Fig. 2 including：
First temperature sensor 100, second temperature sensor 200, three-temperature sensor 300 and processor 400.
Wherein：
First temperature sensor 100 is used to detect the temperature into the air of engine.
Second temperature sensor 200 is used to detect the temperature into the waste gas of engine.
Three-temperature sensor 300 is used to detect the temperature into the mixed gas of engine.
Processor 400 respectively with the first temperature sensor 100, second temperature sensor 200 and three-temperature sensor 300
Connection, processor 400 are used for the oxygen concentration for calculating engine exhaust, calculating process are briefly described here, other are not
Address partly to refer to and be described above：
Processor 400 calculates the total of engine using the charging efficiency of engine, the rotating speed of engine and engine displacement
Air-mass flow.Afterwards, temperature of the processor 400 using the air of engine, the temperature of the waste gas into engine, entrance
The temperature of the mixed gas of engine and total air-mass flow of engine, calculate the mass flow into the air of engine
With the mass flow of the waste gas into engine.Afterwards, processor 400 calculates current time into engine using formula 4
The oxygen concentration of mixed gas, wherein,Calculating process first after engine unlatching is configured as initial value,
The oxygen concentration of the last engine exhaust being calculated is configured as in follow-up calculating process.Afterwards, the profit of processor 400
The oxygen concentration of engine exhaust is calculated with formula 5。
The system of the oxygen concentration disclosed by the invention for determining engine exhaust, entered by three temperature sensor detections
The temperature of the air of engine, into engine waste gas temperature, into engine mixed gas temperature, processor profit
With total air-mass flow of the discharge capacity account engine of the charging efficiency of engine, the rotating speed of engine and engine, afterwards
The total air-mass flow for detecting temperature value and engine based on three temperature sensors is assured that engine exhaust
Oxygen concentration.The system of the oxygen concentration disclosed by the invention for determining engine exhaust, the detection data used only include three
Individual temperature value, because temperature sensor can carry out temperature detection at any time, therefore system disclosed by the invention is based on, in engine
The oxygen concentration in engine exhaust can be quickly determined after startup.Further, since what temperature sensor changed for air-flow
Sensitiveness is very low, even if air-flow is unstable still to be able to accurate detection temperature, therefore, system disclosed by the invention is to pipeline structure
Sensitiveness is very low, so as to reduce the requirement to engine pipelines layout.
In implementation, processor 400 can utilize total air-mass flow of the calculating engine of formula 1.
In addition, processor 400 can utilize formulaCalculate and enter hair
The mass flow m of the air of motivation1, utilize formulaCalculating enters engine
Waste gas mass flow m2。
Preferably, the detection probe of the first temperature sensor 100 is arranged at the air inlet pipe after cleaner
In, more accurately to detect the temperature into the air of engine.
In addition, as a kind of preferred scheme, the detection probe of second temperature sensor 200 may be disposed at the outlet of EGR valves
Place, more accurately to detect the temperature into the waste gas of engine.
In addition, as a kind of preferred scheme, the detection probe of three-temperature sensor 300 may be disposed at the air inlet of engine
At mouthful, more accurately to detect the temperature into the mixed gas of engine.
In implementation, the first temperature sensor 100, second temperature sensor 200 and three-temperature sensor 300 are preferable
Use thermistor temperature sensor.
Finally, it is to be noted that, herein, such as first and second or the like relational terms be used merely to by
One entity or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or operation
Between any this actual relation or order be present.Moreover, term " comprising ", "comprising" or its any other variant meaning
Covering including for nonexcludability, so that process, method, article or equipment including a series of elements not only include that
A little key elements, but also the other element including being not expressly set out, or also include for this process, method, article or
The intrinsic key element of equipment.In the absence of more restrictions, the key element limited by sentence "including a ...", is not arranged
Except other identical element in the process including the key element, method, article or equipment being also present.
Each embodiment is described by the way of progressive in this specification, what each embodiment stressed be and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.To the upper of the disclosed embodiments
State bright, professional and technical personnel in the field is realized or using the present invention.A variety of modifications to these embodiments are to ability
It will be apparent for the professional and technical personnel in domain, generic principles defined herein can not depart from the present invention's
In the case of spirit or scope, realize in other embodiments.Therefore, the present invention be not intended to be limited to it is shown in this article these
Embodiment, and it is to fit to the most wide scope consistent with principles disclosed herein and features of novelty.
Claims (9)
- A kind of 1. method for the oxygen concentration for determining engine exhaust, it is characterised in that methods described includes：Total air-mass flow of engine is calculated using the charging efficiency of engine, the rotating speed of engine and engine displacement；The mixed gas of temperature of the detection into the air of engine, the temperature of the waste gas into engine and entrance engine Temperature；Using the temperature for the air for entering engine, into engine waste gas temperature, the mixed gas into engine Total air-mass flow of temperature and engine, calculate the mass flow into the air of engine and the waste gas into engine Mass flow；Utilize formulaCurrent time is calculated into the oxygen of the mixed gas of engine Concentration, wherein, m1To enter the mass flow of the air of engine, m2To enter the mass flow of the waste gas of engine, m3 For total air-mass flow of engine,For the oxygen concentration in air,Meter first after engine unlatching Calculation process is configured as initial value, and the oxygen of the last engine exhaust being calculated is configured as in follow-up calculating process Concentration；Utilize formulaCalculate the oxygen concentration of engine exhaust, wherein, F is to be sprayed by cylinder The amount of oxygen that the fuel consumption penetrated is fallen；Wherein, the temperature for the air for entering engine, the temperature of waste gas into engine, the gaseous mixture into engine are utilized The temperature of body and total air-mass flow of engine, calculate the mass flow for the air for entering engine and enter engine The mass flow of waste gas, including：Utilize formulaCalculate the mass flow m into the air of engine1；Utilize formulaCalculate the mass flow m into the waste gas of engine2；Wherein, C1For the specific heat capacity of air, C2For the specific heat capacity of waste gas, C3To enter the specific heat capacity of the mixed gas of engine, T1 To enter the temperature of the air of engine, T2To enter the temperature of the waste gas of engine, T3To enter the mixed gas of engine Temperature.
- 2. according to the method for claim 1, it is characterised in that using the charging efficiency of engine, engine rotating speed and Engine displacement calculates total air-mass flow of engine, including：Utilize formula m3=K*Neng/2*VengCalculate total air-mass flow m of engine3, wherein, K is that the inflation of engine is imitated Rate, NengFor the rotating speed of engine, VengFor engine displacement.
- 3. according to the method for claim 1, it is characterised in that detection is into the temperature of air of engine：Detecting position The temperature of air in the air inlet pipe after air cleaner.
- 4. according to the method for claim 3, it is characterised in that detection is into the temperature of waste gas of engine：Detect EGR The temperature of exhaust gas recirculation valve outlet.
- 5. a kind of system for the oxygen concentration for determining engine exhaust, it is characterised in that including the first temperature sensor, the second temperature Spend sensor, three-temperature sensor and processor；First temperature sensor is used to detect the temperature into the air of engine；The second temperature sensor is used to detect the temperature into the waste gas of engine；The three-temperature sensor is used to detect the temperature into the mixed gas of engine；The processor is connected with the first temperature sensor, second temperature sensor and the three-temperature sensor respectively, institute The oxygen concentration that processor is used to calculate engine exhaust is stated, is specifically included：Total air-mass flow of engine is calculated using the charging efficiency of engine, the rotating speed of engine and engine displacement； Using the temperature of the air of engine, into engine waste gas temperature, into engine mixed gas temperature and hair Total air-mass flow of motivation, calculate the mass flow into the air of engine and the quality stream of the waste gas into engine Amount；Utilize formulaCurrent time is calculated into the oxygen of the mixed gas of engine Concentration, wherein, m1To enter the mass flow of the air of engine, m2To enter the mass flow of the waste gas of engine, m3 For total air-mass flow of engine,For the oxygen concentration in air,Meter first after engine unlatching Calculation process is configured as initial value, and the oxygen of the last engine exhaust being calculated is configured as in follow-up calculating process Concentration；Utilize formulaCalculate the oxygen concentration of engine exhaust, wherein, F is by cylinder The amount of oxygen that the fuel consumption of injection is fallen；Wherein, the temperature for the air for entering engine, the temperature of waste gas into engine, the gaseous mixture into engine are utilized The temperature of body and total air-mass flow of engine, calculate the mass flow for the air for entering engine and enter engine The mass flow of waste gas, including：Utilize formulaCalculate the mass flow m into the air of engine1；Utilize formulaCalculate the mass flow m into the waste gas of engine2；Wherein, C1For the specific heat capacity of air, C2For the specific heat capacity of waste gas, C3To enter the specific heat capacity of the mixed gas of engine, T1 To enter the temperature of the air of engine, T2To enter the temperature of the waste gas of engine, T3To enter the mixed gas of engine Temperature.
- 6. system according to claim 5, it is characterised in that the detection probe of first temperature sensor is arranged at position In the air inlet pipe after cleaner.
- 7. the system according to claim 5 or 6, it is characterised in that the detection probe of the second temperature sensor is set In the exit of EGR exhaust recycle valve.
- 8. system according to claim 7, it is characterised in that the detection probe of the three-temperature sensor is arranged at institute State at the air inlet of engine.
- 9. system according to claim 5, it is characterised in that first temperature sensor, second temperature sensor and Three-temperature sensor is thermistor temperature sensor.
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| CN112648709A (en) * | 2020-12-04 | 2021-04-13 | 中国航空工业集团公司西安航空计算技术研究所 | Automatic oxygen concentration maintaining and controlling device for closed space |
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| CN1637254A (en) * | 2003-12-25 | 2005-07-13 | 株式会社电装 | Control device for internal combustion engine |
| CN103485908A (en) * | 2012-06-07 | 2014-01-01 | 通用汽车环球科技运作有限责任公司 | Humidity determination and compensation systems and methods using an intake oxygen sensor |
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| JP2005299600A (en) * | 2004-04-15 | 2005-10-27 | Toyota Motor Corp | Fuel supply control device of internal combustion engine |
| JP4730122B2 (en) * | 2006-02-07 | 2011-07-20 | いすゞ自動車株式会社 | Engine control method and engine control system |
| EP2098710B1 (en) * | 2008-03-04 | 2016-07-27 | GM Global Technology Operations LLC | A method for estimating the oxygen concentration in internal combustion engines |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1637254A (en) * | 2003-12-25 | 2005-07-13 | 株式会社电装 | Control device for internal combustion engine |
| CN103485908A (en) * | 2012-06-07 | 2014-01-01 | 通用汽车环球科技运作有限责任公司 | Humidity determination and compensation systems and methods using an intake oxygen sensor |
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