CN106481465B - Calculation method, system and the vehicle of EGR rate - Google Patents
Calculation method, system and the vehicle of EGR rate Download PDFInfo
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Abstract
The present invention provides a kind of calculation method of EGR rate, system and vehicles, this method comprises: obtaining the actual volume flow for entering the gas of cylinder；Detect the admission pressure and intake air temperature of engine；The amount of the substance of gas is obtained according to the gas constant of actual volume flow, admission pressure, intake air temperature and gas；The amount of the substance into the fresh air of cylinder is obtained according to the flow for the fresh air for entering cylinder and air molal weight；And EGR rate is measured according to the substance of the amount and fresh air of the substance of gas.Method of the invention can simply and efficiently calculate EGR rate, and carry out situation to the work of engine using the calculated result and corrected in real time, the stability of oil consumption and discharge when improving engine transient operation.
Description
Technical field
The present invention relates to automobile technical field, in particular to a kind of calculation method of EGR rate, system and vehicle.
Background technique
Currently, the oil consumption of the engine of the vehicle based on petroleum fuel is high, discharge amount is big, the thermal efficiency is lower.It is controlled
System is typically no to carry out calculating and actual control to EGR rate, and the control of minority system is also based on the EGR of traditional sense
Rate, that is, the mass ratio of the exhausted air quantity recycled and total air inflow, the value are difficult to measure with existing engine test facility, i.e.,
Be difficult under different operating conditions determine air inlet at component, also have led to the difficulty of staking-out work, and in theory deduction because
The variability of air-intake component makes determining for EGR rate need the more complicated and lower model of accuracy, this is even more greatly increased
The difficulty of staking-out work also increases the control difficulty of controller simultaneously.
Summary of the invention
In view of this, the present invention is directed to propose a kind of calculation method of EGR rate, this method can be calculated simply and efficiently
EGR rate, and situation is carried out to the work of engine using the calculated result and is corrected in real time, and then improves engine transient
The stability of oil consumption and discharge when work.
In order to achieve the above objectives, the technical scheme of the present invention is realized as follows:
A kind of calculation method of EGR rate, comprising the following steps: obtain the actual volume stream for entering the gas of cylinder
Amount；Detect the admission pressure and intake air temperature of engine；According to the actual volume flow, the admission pressure, the air inlet
Temperature and the gas constant of the gas obtain the amount of the substance of the gas；According to the fresh sky for entering the cylinder
The flow and air molal weight of gas obtain the amount of the substance into the fresh air of the cylinder；And according to described
The substance of the amount of the substance of gas and the fresh air measures EGR rate.
Further, described to obtain the actual volume flow for entering the gas of cylinder, further comprise: judgement
Whether EGR valve opens；If it is, obtaining instantaneous Fuel consumption correction value, engine theoretical volume flow and according to the first inflation
Efficiency mapping table obtains the first volumetric efficiency correction value, and according to the instantaneous Fuel consumption correction value, engine theoretical volume flow
The actual volume flow of the gas into cylinder is obtained with the first volumetric efficiency correction value；If it is not, then
It obtains engine theoretical volume flow and the second volumetric efficiency correction value is obtained according to the second volumetric efficiency mapping table, and according to institute
It states engine theoretical volume flow and the second volumetric efficiency correction value obtains the reality of the gas into cylinder
Border volume flow.
Further, further includes: be updated according to the original EGR rate that the EGR rate sets vehicle acceptance of the bid.
Further, further includes: EGR valve, VGT and/or WGT are adjusted according to the EGR rate, so that actual
EGR rate meets predetermined demand.
Further, during EGR valve, VGT and/or WGT are adjusted according to the EGR rate, further includes: sentence
Whether disconnected air-fuel ratio is located in predetermined interval；If it is not, then stopping that EGR valve, VGT and/or WGT is adjusted, so that described
Air-fuel ratio is located in the predetermined interval.
Compared with the existing technology, the control method of engine of the present invention has the advantage that
The calculation method of EGR rate of the present invention can simply and efficiently calculate EGR rate, and use the calculated result
It carries out situation to the work of engine to be corrected in real time, the stability of oil consumption and discharge when improving engine transient operation.
It is another object of the present invention to the computing system for proposing a kind of EGR rate, which can simply and efficiently be counted
EGR rate is calculated, and situation is carried out to the work of engine using the calculated result and is corrected in real time, improves engine transient work
The stability of oil consumption and discharge when making.
In order to achieve the above objectives, the technical scheme of the present invention is realized as follows:
A kind of computing system of EGR rate, comprising: module is obtained, for obtaining the reality for entering the gas of cylinder
Volume flow；Detection module, for detecting the admission pressure and intake air temperature of engine；Computing module, for according to the reality
Border volume flow, the admission pressure, the intake air temperature and the gas gas constant obtain the substance of the gas
Amount, and obtained entering the engine air according to the flow for the fresh air for entering the cylinder and air molal weight
The amount of the substance of the fresh air of cylinder, and measuring according to the substance of the amount and fresh air of the substance of the gas
EGR rate.
Further, the acquisition module is for judging whether EGR valve opens, and when whether the EGR valve opens, obtains
It takes instantaneous Fuel consumption correction value, engine theoretical volume flow and the first volumetric efficiency is obtained according to the first volumetric efficiency mapping table
Correction value, and obtained according to the instantaneous Fuel consumption correction value, engine theoretical volume flow and the first volumetric efficiency correction value
To the actual volume flow of the gas into cylinder, and when the EGR valve is not opened, mechanism is started in acquisition
The second volumetric efficiency correction value is obtained by volume flow and according to the second volumetric efficiency mapping table, and theoretical according to the engine
Volume flow and the second volumetric efficiency correction value obtain the actual volume flow of the gas into cylinder.
Further, further includes: adjustment module, for being adjusted according to the EGR rate to EGR valve, VGT and/or WGT
Section, so that actual EGR rate meets predetermined demand.
Further, during EGR valve, VGT and/or WGT are adjusted according to the EGR rate, the adjusting
Module is also used to: judging whether air-fuel ratio is located in predetermined interval；If it is not, then stopping carrying out EGR valve, VGT and/or WGT
It adjusts, so that the air-fuel ratio is located in the predetermined interval.
The computing system of the EGR rate and the calculation method of above-mentioned EGR rate are possessed excellent compared with the existing technology
Gesture is identical, and details are not described herein.
It is another object of the present invention to propose a kind of vehicle, which can simply and efficiently calculate EGR rate, and
Situation is carried out to the work of engine using the calculated result to be corrected in real time, when improving engine transient operation oil consumption with
The stability of discharge.
In order to achieve the above objectives, the technical scheme of the present invention is realized as follows:
A kind of vehicle is provided with the computing system of the EGR rate as described in above-described embodiment.
Possessed advantage is identical compared with the existing technology with the computing system of above-mentioned hair EGR rate for the vehicle,
This is repeated no more.
Detailed description of the invention
The attached drawing for constituting a part of the invention is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart of the calculation method of EGR rate described in the embodiment of the present invention；
Fig. 2 is the overview flow chart of the calculation method of EGR rate described in the embodiment of the present invention；
Fig. 3 is the structural block diagram of the computing system of EGR rate described in the embodiment of the present invention.
Description of symbols:
The computing system of 1000-EGR rate, 100- obtain module, 200- detection module, 300- computing module.
Specific embodiment
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
Fig. 1 is the flow chart of the calculation method of EGR rate according to an embodiment of the invention.
In the following description, engine is, for example, the engine based on petroleum fuel.
As shown in Figure 1, the calculation method of EGR rate according to an embodiment of the invention, includes the following steps:
S1: the actual volume flow for entering the gas of cylinder is obtained.
In one embodiment of the invention, as shown in Figure 1, and being chosen in conjunction with Fig. 2, above-mentioned steps S1, acquisition entrance hair
The actual volume flow of the gas of motivation cylinder further comprises: judging whether EGR valve opens, if it is, obtaining instantaneous oil
Consume correction value (i.e. CUR correction value), engine theoretical volume flow and (in such as Fig. 2 pre- according to the first volumetric efficiency mapping table
The basis volume volumetric efficiency amendment MAP having when EGR participation first set) the first volumetric efficiency correction value is obtained, and according to wink
When Fuel consumption correction value, engine theoretical volume flow and the first volumetric efficiency correction value obtain into the gas of cylinder
Actual volume flow；If it is not, then obtaining engine theoretical volume flow and according to the second volumetric efficiency mapping table (in such as Fig. 2
Basis volume volumetric efficiency when the preset participation without EGR corrects MAP) obtain the second volumetric efficiency correction value, and root
The actual volume stream into the gas of cylinder is obtained according to engine theoretical volume flow and the second volumetric efficiency correction value
Amount.In other words, if EGR valve is opened, namely in the case where there is EGR participation, then by the way that CUR correction value, engine is theoretical
Volume flow obtains actual volume flow after being multiplied with the first volumetric efficiency correction value, and actual volume flow is for example labeled as V.Such as
Fruit EGR valve is not opened, namely without EGR participate in the case where, then engine theoretical volume flow and the second volumetric efficiency are repaired
Positive value is multiplied, and to obtain the actual volume flow into the gas of engine cylinder, such as is denoted as V.
S2: the admission pressure and intake air temperature of engine are detected.Specifically, for example setting air inlet in inlet manifold pressure stabilizing cavity
Temperature sensor and pressure sensor, to detect to obtain the admission pressure P and intake air temperature T of engine respectively.
S3: the substance of gas is obtained according to the gas constant of actual volume flow, admission pressure, intake air temperature and gas
Amount.Specifically, multiplied by gas constant R, utilizing gaseous state side after obtaining the intake air temperature T and admission pressure P of engine
The amount n of the substance of all gases into cylinder can be obtained in journey PV=nRT.
S4: it is obtained entering cylinder according to the flow for the fresh air for entering cylinder and air molal weight
Fresh air substance amount.Specifically, for example, being obtained using air flow meter measurement into the fresh of engine cylinder
The flow of air obtains the amount of the substance of all fresh airs into engine cylinder then divided by air molal weight.
It should be noted that the gas of engine cylinder air inlet is pure air, and empty in the case where no EGR is participated in
The molal weight of gas is M, then it is, for example, m=n*M that air quality, which is calculated,.Further, the case where no EGR is participated in
Under, it can mutually be calibrated with the value of the calculated value and air flow meter.
S5: EGR rate is measured according to the substance of the amount of the substance of gas and fresh air.Specifically, utilizing institute
There is the amount into the substance of the gas of cylinder to subtract the amount of the substance of all fresh airs into cylinder, so
Afterwards again divided by the amount of the substance of all gases into cylinder, the result obtained is EGR rate.
Further, as shown in Fig. 2, the calculation method of the EGR rate for example further include: EGR is calculated in step s 5
After rate, it is updated according to the original EGR rate that the EGR rate sets vehicle acceptance of the bid.In other words, it is common with engine test
The EGR rate that measures of intake and exhaust component measuring device be that standard value demarcates EGR rate, update EGR correction value.
In turn, the calculation method of the EGR rate of above-described embodiment through the invention is accurate to EGR rate using existing equipment
Ground measures, and facilitates the accurate control of in-cylinder combustion situation.
Further, after EGR rate is calculated, EGR valve, VGT and/or WGT can also be adjusted according to EGR rate
Section, so that actual EGR rate meets predetermined demand.More specifically, in this process, for example, whether judge air-fuel ratio
In predetermined interval, if it is not, then stopping that EGR valve, VGT and/or WGT is adjusted, so that air-fuel ratio is located at fate
In.In other words, in the steady state, it is consistent with demand EGR rate to first have to the practical EGR rate for guaranteeing to be calculated, then passes through
Air system actuator EGR valve, TVA, VGT or WGT etc. are adjusted, realize the change of EGR rate to guarantee the reality calculated
The real-time tracking of EGR rate and demand EGR rate.Under transient state, need guaranteeing air-fuel ratio in zone of reasonableness (meeting predetermined demand)
In the case of, it is consistent with demand EGR rate that practical EGR rate is adjusted in real time.Further, in the adjusting and sky that not can guarantee EGR rate
In the case that the adjusting of combustion ratio does not clash, need preferentially to guarantee the adjusting of air-fuel ratio.That is, the embodiment of the present invention
In such a way that transient state compensation and stable state compensation combine, and in transient state compensation, the preferential adjusting for guaranteeing air-fuel ratio.
To sum up, method of the invention calculating link is simple, and efficiently, control system operational efficiency height takes up less resources, and marks
It is succinct to determine process.Reference standard is easy to spread, it is easy to accomplish.In addition, this method can be improved combustion stability, and then improve oil
The stability of consumption and discharge guarantees the discharge under transient state.
Therefore, the calculation method of EGR rate according to an embodiment of the present invention can simply and efficiently calculate EGR rate, and make
It carries out situation to the work of engine with the calculated result to be corrected in real time, oil consumption and row when improving engine transient operation
The stability put.
Further embodiment of the present invention also discloses a kind of computing system of EGR rate.
Fig. 3 is the structural block diagram of the computing system of EGR rate according to an embodiment of the invention.As shown in figure 3, according to this
The computing system 1000 of the EGR rate of invention one embodiment, comprising: obtain module 100, detection module 200 and computing module
300。
Module 100 is obtained to be used to obtain the actual volume flow into the gas of cylinder.
In one embodiment of the invention, for example, obtaining module 100 for judging whether EGR valve opens, and in EGR
When whether valve is opened, instantaneous Fuel consumption correction value, engine theoretical volume flow are obtained and according to the first volumetric efficiency mapping table
The first volumetric efficiency correction value is obtained, and according to instantaneous Fuel consumption correction value, engine theoretical volume flow and the first volumetric efficiency
Correction value obtains the actual volume flow into the gas of cylinder, and when EGR valve is not opened, mechanism is started in acquisition
The second volumetric efficiency correction value is obtained by volume flow and according to the second volumetric efficiency mapping table, and according to engine theoretical volume
Flow and the second volumetric efficiency correction value obtain the actual volume flow into the gas of cylinder.
Detection module 200 is used to detect the admission pressure and intake air temperature of engine.
Computing module 300 according to the gas constant of actual volume flow, admission pressure, intake air temperature and gas for obtaining
The amount of the substance of gas, and obtain entering according to the flow for the fresh air for entering cylinder and air molal weight and start
The amount of the substance of the fresh air of machine cylinder, and EGR is measured according to the substance of the amount and fresh air of the substance of gas
Rate.
Further, in one embodiment of the invention, which for example further includes adjustment module 400 (in Fig. 3
It is not shown).Adjustment module 400 is for being adjusted EGR valve, VGT and/or WGT according to EGR rate, so that actual EGR rate is full
The predetermined demand of foot.More specifically, in above-mentioned adjustment process, it is pre- that adjustment module 400 is also used to judge whether air-fuel ratio is located at
Determine in section, if it is not, then stopping that EGR valve, VGT and/or WGT is adjusted, so that air-fuel ratio is located at the predetermined interval
It is interior.
The computing system of EGR rate according to an embodiment of the present invention can simply and efficiently calculate EGR rate, and use the meter
It calculates result situation is carried out to the work of engine and corrected in real time, oil consumption and discharge is steady when raising engine transient operation
It is qualitative.
It should be noted that the specific implementation of the computing system of the EGR rate of the embodiment of the present invention and the present invention are implemented
The specific implementation of the calculation method of the EGR rate of example is similar, specifically refers to the description of method part, in order to reduce redundancy,
It is not repeated herein.
Further, embodiment of the invention discloses a kind of vehicle, being provided with the EGR rate as described in above-described embodiment
Computing system.The vehicle can simply and efficiently calculate EGR rate, and carry out feelings to the work of engine using the calculated result
Condition is corrected in real time, the stability of oil consumption and discharge when improving engine transient operation.
In addition, other compositions of vehicle according to an embodiment of the present invention and effect are for those of ordinary skill in the art
For be all it is known, in order to reduce redundancy, do not repeat them here.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of calculation method of EGR rate, which comprises the following steps:
Obtain the actual volume flow for entering the gas of cylinder, comprising: judge whether EGR valve opens, if it is, obtaining
It takes instantaneous Fuel consumption correction value, engine theoretical volume flow and the first volumetric efficiency is obtained according to the first volumetric efficiency mapping table
Correction value, and obtained according to the instantaneous Fuel consumption correction value, engine theoretical volume flow and the first volumetric efficiency correction value
To the actual volume flow of the gas into cylinder, if it is not, then obtaining engine theoretical volume flow and root
The second volumetric efficiency correction value is obtained according to the second volumetric efficiency mapping table, and according to the engine theoretical volume flow and described
Second volumetric efficiency correction value obtains the actual volume flow of the gas into cylinder；
Detect the admission pressure and intake air temperature of engine；
Institute is obtained according to the gas constant of the actual volume flow, the admission pressure, the intake air temperature and the gas
State the amount of the substance of gas；
It is obtained entering the engine air according to the flow for the fresh air for entering the cylinder and air molal weight
The amount of the substance of the fresh air of cylinder；And
EGR rate is measured according to the substance of the amount of the substance of the gas and the fresh air.
2. the calculation method of EGR rate according to claim 1, which is characterized in that further include: according to the EGR rate to vehicle
The original EGR rate set of acceptance of the bid is updated.
3. the calculation method of EGR rate according to claim 1, which is characterized in that further include: according to the EGR rate to EGR
Valve, VGT and/or WGT are adjusted, so that actual EGR rate meets predetermined demand.
4. the calculation method of EGR rate according to claim 3, which is characterized in that according to the EGR rate to EGR valve,
During VGT and/or WGT is adjusted, further includes:
Judge whether air-fuel ratio is located in predetermined interval；
If it is not, then stopping that EGR valve, VGT and/or WGT is adjusted, so that the air-fuel ratio is located at the predetermined interval
It is interior.
5. a kind of computing system of EGR rate characterized by comprising
Module is obtained, for obtaining the actual volume flow for entering the gas of cylinder, comprising: judge whether EGR valve is opened
It opens, and when whether the EGR valve opens, obtains instantaneous Fuel consumption correction value, engine theoretical volume flow and according to first
Volumetric efficiency mapping table obtains the first volumetric efficiency correction value, and according to the instantaneous Fuel consumption correction value, engine theoretical volume
Flow and the first volumetric efficiency correction value obtain the actual volume flow of the gas into cylinder, Yi Ji
When the EGR valve is not opened, obtains engine theoretical volume flow and the second inflation is obtained according to the second volumetric efficiency mapping table
Efficiency correction value, and the entrance is obtained according to the engine theoretical volume flow and the second volumetric efficiency correction value and is sent out
The actual volume flow of the gas of motivation cylinder；
Detection module, for detecting the admission pressure and intake air temperature of engine；
Computing module, for according to the actual volume flow, the admission pressure, the intake air temperature and the gas gas
Body constant obtains the amount of the substance of the gas, and is rubbed according to the flow and air for the fresh air for entering the cylinder
Your quality obtains the amount of the substance into the fresh air of the cylinder, and according to the amount of the substance of the gas and
The substance of the fresh air measures EGR rate.
6. the computing system of EGR rate according to claim 5, which is characterized in that further include:
Adjustment module, for EGR valve, VGT and/or WGT to be adjusted according to the EGR rate, so that actual EGR rate meets
Predetermined demand.
7. the computing system of EGR rate according to claim 6, which is characterized in that according to the EGR rate to EGR valve,
During VGT and/or WGT is adjusted, the adjustment module is also used to:
Judge whether air-fuel ratio is located in predetermined interval；
If it is not, then stopping that EGR valve, VGT and/or WGT is adjusted, so that the air-fuel ratio is located at the predetermined interval
It is interior.
8. a kind of vehicle, which is characterized in that the computing system just like the described in any item EGR rates of claim 5-7 is arranged.
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109882300B (en) * | 2017-12-06 | 2021-05-18 | 上海汽车集团股份有限公司 | Method and device for correcting inflation efficiency |
| CN111175050A (en) * | 2020-01-19 | 2020-05-19 | 安徽华菱汽车有限公司 | Method and device for simulating fresh air inflow abnormity of diesel engine |
| CN111412071B (en) * | 2020-02-20 | 2022-07-15 | 义乌吉利动力总成有限公司 | EGR rate calculation method and device, vehicle-mounted terminal and storage medium |
| CN116066266A (en) * | 2021-10-29 | 2023-05-05 | 北汽福田汽车股份有限公司 | Exhaust gas recirculation system fault detection method and device, storage medium and vehicle |
| CN115585070B (en) * | 2022-09-30 | 2024-07-05 | 东风汽车集团股份有限公司 | Method, device, equipment and storage medium for regulating minimum EGR rate |
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