CN106014571B - The computational methods of engine original machine NOx value - Google Patents
The computational methods of engine original machine NOx value Download PDFInfo
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- CN106014571B CN106014571B CN201610374590.3A CN201610374590A CN106014571B CN 106014571 B CN106014571 B CN 106014571B CN 201610374590 A CN201610374590 A CN 201610374590A CN 106014571 B CN106014571 B CN 106014571B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
- F01N2560/026—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting NOx
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/146—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an NOx content or concentration
- F02D41/1461—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an NOx content or concentration of the exhaust gases emitted by the engine
- F02D41/1462—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an NOx content or concentration of the exhaust gases emitted by the engine with determination means using an estimation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The present invention provides a kind of computational methods of engine original machine NOx value, including two paths；First paths are measured by NOx sensor and obtain the first original machine NOx value after correcting；Second paths obtain original machine basis NOx value by the original machine basis NOx value MAP of engine current working inquiry calibration, and by obtaining the second original machine NOx value after amendment；Select the output of one of two paths as original machine NOx output valves under engine current working by NOx path selection modules.The present invention can provide accurate upstream NOx value input for SCR urea injection systems, and then carry out accurate urea injection control.
Description
Technical field
The present invention relates to motor exhaust processing technology field, especially a kind of computational methods of engine original machine NOx value.
Background technology
Currently, SCR（Selective catalytic reduction）Post-processing technology is in six Reduction for Diesel Engines low exhaust gas of state four, state five and state
NOx（Nitrogen oxides）Technical way.How accurately to judge the NOx value in diesel engine vent gas, determines that SCR is post-processed
Can control system accurately control urea injecting quantity, prevent SCR conversion efficiency deficiency or NH_3 leakage excessive.Therefore, accurately sentence
NOx value in disconnected diesel engine vent gas is most important.
In general, calculating method there are two types of the NOx values in diesel engine vent gas：The first is by diesel exhaust gas tail
NOx sensor is installed, for measuring the NOx concentration in diesel engine vent gas on pipe；Second is to obtain original machine by model calibration
The NOx concentration value or mass flow value of discharge.
In first method, NOx sensor can measure the NOx concentration value in diesel engine vent gas in real time.It is sensed based on NOx
The operation principle of device, NOx sensor operating temperature need to be more than a minimum threshold values, in cold boot of diesel, delivery temperature
This threshold values can be generally less than, therefore NOx sensor can not work normally, SCR aftertreatment control units cannot obtain
The original machine NOx concentration value of diesel engine.In addition, NOx sensor is merely able to measure the NO in tail gas, and also have in tail gas a small amount of
NO2 can not be arrived by sensor measurement.Therefore, NOx sensor measurement original machine NOx value is only used only, and there are certain drawbacks.
Second method is by demarcating original machine NOx emission value MAP on engine pedestal（Arteries and veins stave or arteries and veins spectrogram）, control
NOx emission value when device processed obtains each engine operating condition by inquiring MAP.Currently, state four, state five SCR control strategy in
Mainly use the method.But six stage of state is arrived, due to engine EGR system（EGR exhaust recirculating system）Influence, Jin Jintong
It is inaccurate to cross calibration NOx value MAP, needs to consider influence and other influence factor of the EGR rate to NOx emission value.
Invention content
It is an object of the present invention to overcome the shortcomings of the prior art and provide a kind of meters of engine original machine NOx value
Calculation method has considered the original machine basis NOx value of NOx sensor measured value and calibration, according to engine operating condition and sensor
State selects suitable NOx value output, accurate upstream NOx value input can be provided for SCR urea injection systems, and then carry out
Accurate urea injection control.The technical solution adopted by the present invention is：
A kind of computational methods of engine original machine NOx value, including two paths；
First paths are measured by NOx sensor and obtain the first original machine NOx value after correcting；
Second paths obtain original machine basis by the original machine basis NOx value MAP of engine current working inquiry calibration
NOx value, and by obtaining the second original machine NOx value after amendment；
Select the output of one of two paths as original machine under engine current working by NOx path selection modules
NOx output valves.
Further, the first paths specifically include：
NOx sensor signal processing module receives the signal of NOx sensor input first, and in this NOx sensor signal
NOx sensor signal is filtered in processing module to obtain filtered NOx sensor measured value；
Then back pressure amendment and NO2 coefficient amendments are exhausted to NOx sensor measured value, obtain revised NOx and passes
Sensor value is as the first original machine NOx value.
Specifically, described back pressure amendment to be exhausted to NOx sensor measured value and NO2 coefficients are repaiied in the first paths
Just, it specifically includes：
1) exhaust back pressure correction factor is obtained：
Pressure difference that exhaust back pressure at NOx sensor is generated by ambient value, diesel oxidation catalyst DOC,
The pressure difference that diesel particulate trap DPF is generated is added to obtain with the selective catalytic reduction device SCR pressure differences generated；
Exhaust back pressure corrects MAP with NOx sensor input value common query back pressure and obtains exhaust back pressure to NOx measuring signals
Correction factor, that is, exhaust back pressure correction factor；
2) NO2 correction factors are obtained：
Original machine NO2/NOx ratio MAP are inquired by engine speed, distributive value, the ratio of original machine NO2 and NOx can be obtained
Value relationship；According to NO2/NOx ratios and NOx sensor measured value common query NO2 correction factor MAP, when obtaining different operating modes
NO2 correction factors；
3) the revised NOx sensor value that the first paths obtain is that filtered NOx sensor measured value is multiplied by the back of the body
Press correction factor and NO2 correction factors.
Further, the pressure difference, selective catalytic reduction device SCR of diesel oxidation catalyst DOC generations generate
Pressure difference inquires DOC back pressure MAP tables respectively by engine rotational speed signal and distributive value signal and SCR back pressure MAP tables obtain.
Further, the second paths specifically include：
1）Original machine basis NOx value MAP is inquired by engine speed, distributive value first, obtains original machine basis NOx value；
2）Then consider air excess factor, intake air temperature, engine water temperature and atmospheric humidity to original machine basis NOx value
Influence, obtain NOx correction amounts；Original machine basis NOx value obtains original machine stable state NOx value obtained by calibrating plus NOx correction amounts；
3）Transient state amendment finally is carried out according to present engine rotating speed, distributive value to stable state NOx value, after obtaining transient state amendment
NOx value i.e. the second original machine NOx value.
Specifically, the consideration air excess factor, intake air temperature, engine water temperature and atmospheric humidity are to original machine basis
The influence of NOx value obtains NOx correction amounts, is obtained by following step：
λ drift corrections：λ benchmark MAP is inquired by engine speed and distributive value first and obtains λ a reference values；Engine exists
It will be a certain deviation with λ a reference values due to the practical λ measured values of the influence suddenly accelerated when operation；λ measured values subtract λ benchmark and are worth to
λ deviations inquire λ drift corrections MAP together with the NOx value of original machine basis and obtain the λ drift correction values of NOx；
Intake air temperature drift correction：First by engine speed and distributive value inquire intake air temperature benchmark MAP obtain into
Temperature degree a reference value；Intake air temperature measured value subtracts intake air temperature benchmark and is worth to intake air temperature deviation, with original machine basis NOx
Value inquires intake air temperature drift correction MAP and obtains the intake air temperature drift correction value of NOx together；
Engine water temperature drift correction：Engine water temperature benchmark MAP is inquired by engine speed and distributive value first to obtain
To engine water temperature a reference value；Engine water temperature measurements subtract engine water temperature benchmark and are worth to engine water temperature deviation,
The engine water temperature drift correction value of NOx is obtained with engine water temperature drift correction MAP is inquired together with the NOx value of original machine basis；
Atmospheric humidity drift correction：λ benchmark MAP is inquired by engine speed and distributive value first and obtains atmospheric humidity base
Quasi- value；Atmospheric humidity measured value subtracts atmospheric humidity benchmark and is worth to atmospheric humidity deviation, is looked into together with the NOx value of original machine basis
It askes atmospheric humidity drift correction MAP and obtains the atmospheric humidity drift correction value of NOx；
The λ drift corrections value of NOx, the intake air temperature drift correction value of NOx, the engine water temperature drift correction value of NOx,
The atmospheric humidity drift correction value of NOx is added to obtain NOx correction amounts.
Specifically, described that transient state amendment is carried out according to present engine rotating speed, distributive value to stable state NOx value, it is specific to wrap
It includes：
Transient state filtering time when transient state filtering time MAP obtains different operating modes is inquired by engine speed, distributive value
T, then the revised NOx value of original machine, that is, stable state NOx value is subjected to first-order filtering according to transient state filtering time t, obtain transient state amendment
NOx value afterwards.
Further,
The NOx path selection modules judge final original machine NOx output valves from the first paths still according to judgment value
Second paths；Judgment value depends on two factors：1, NOx sensor signal credibility is looked by engine speed and distributive value
Whether credible MAP obtains NOx sensor signal under current working；2, NOx sensor quantity of state；If NOx sensor signal can
Letter, and NOx sensor quantity of state indicates that NOx sensor is in normal operating conditions, then original machine NOx output valves come from first road
Diameter；Remaining situation original machine NOx output valve comes from the second paths.
The advantage of the invention is that：
1）The original machine basis NOx value of NOx sensor measured value and calibration is considered, it is more acurrate to calculate NOx value.
2）The NOx value accuracy that various modifying factors ensure that calculating is considered.
Description of the drawings
Fig. 1 is the method general illustration of the present invention.
Fig. 2 is the NOx sensor signal processing module schematic diagram of the present invention.
Fig. 3 is the exhaust back pressure correcting module schematic diagram of the present invention.
Fig. 4 is the NO2 correcting module schematic diagrames of the present invention.
Fig. 5 is the original machine basis NOx value module diagram of the present invention.
Fig. 6 is the original machine NOx correcting module schematic diagrames of the present invention.
Fig. 7 is the NOx transient state correcting module schematic diagrames of the present invention.
Fig. 8 is the NOx path selection module schematic diagrames of the present invention.
Specific implementation mode
With reference to specific drawings and examples, the invention will be further described.
The computational methods of engine original machine NOx value proposed by the present invention, illustrate by taking diesel engine as an example, such as scheme
Shown in 1, the calculating path of diesel engine original machine NOx value has two：
First paths are measured by NOx sensor and obtain the first original machine NOx value after correcting；
Second paths obtain original machine basis by the original machine basis NOx value MAP of engine current working inquiry calibration
NOx value, and by obtaining the second original machine NOx value after amendment；
Then judge to select under engine current working by NOx path selection modules the output of one of two paths as
Original machine NOx output valves.
（One）First paths specifically include：
NOx sensor signal processing module receives the signal of NOx sensor input first, and in this NOx sensor signal
NOx sensor signal is filtered in processing module to obtain filtered NOx sensor measured value；As shown in Figure 2；
The influence of exhaust back pressure and NO2 to NOx sensor is considered in the present invention.Research shows that different exhaust back pressures pair
NOx sensor measured value has a certain impact, therefore to obtain accurate NOx measured values, and exhaust back pressure is added in the present invention
Influence coefficient.
1）Exhaust back pressure correction factor is obtained by an exhaust back pressure correcting module；General N Ox sensors are mounted on
Before diesel engine vent gas post-processing unit, diesel engine vent gas after-treatment components include mainly：DOC (diesel oxidation catalyst),
DPF（Diesel particulate trap）And SCR（Selective catalytic reduction device）.Ignore the influence of blank pipe, diesel engine back pressure mainly by
Exhaust aftertreatment unit generate, therefore the exhaust back pressure at NOx sensor can by ambient value, DOC generate pressure difference,
The pressure difference that DPF is generated is added to obtain with the SCR pressure differences generated.The pressure difference that the pressure difference and SCR that wherein DOC is generated generate
DOC back pressure MAP tables are inquired respectively by engine rotational speed signal and distributive value signal and SCR back pressure MAP tables obtain, and DPF is generated
Pressure difference by DPF differential pressure pickups directly measure obtain, ambient pressure signal is obtained by ambient pressure sensor measurement.
Exhaust back pressure corrects MAP with NOx sensor input value common query back pressure and obtains exhaust back pressure to NOx measuring signals
Correction factor, that is, exhaust back pressure correction factor, as shown in Figure 3；
2）NO2 correction factors are obtained by a NO2 correcting module：It is using NO2 correcting module main causes：NOx
It is NO that Fundamentals of Sensors, which cause it to assume all nitrogen oxides during the work time all, and actual conditions are nitrogen oxidations in tail gas
Object is made of NO and NO2, wherein about 90% is NO, the NOX values and actually have deviation that such sensor is measured.Therefore consider
The measured value of NO2 compensating approach NOx sensors.The calculating logic of NO2 correcting modules is：It is looked by engine speed, distributive value
Diesel engine original machine NO2/NOx ratio MAP are ask, the ratio relation of original machine NO2 and NOx can be obtained；According to NO2/NOx ratios and
NOx sensor measured value common query NO2 correction factor MAP, obtain NO2 correction factors when different operating modes；As shown in Figure 4；
3) the revised NOx sensor value that the first paths obtain is that filtered NOx sensor measured value is multiplied by the back of the body
Press correction factor and NO2 correction factors.
（Two）Second paths specifically include：
1）Introduce original machine basis NOx value module；As shown in Figure 5：
Original machine basis NOx value MAP is inquired by engine speed, distributive value, obtains original machine basis NOx value（This is original machine
NOx calibration values）；
Original machine NO2/NOx ratio MAP are inquired by engine speed, distributive value, obtain NO2/NOx ratios when different operating modes
Value, this NO2/NOx ratio are provided to the NO2 correcting modules in the first paths；
2）Introduce original machine NOx correcting modules：
Original machine NOx correcting modules mainly consider air excess factor, intake air temperature, engine water temperature and atmospheric humidity pair
The influence of original machine basis NOx value, obtains NOx correction amounts；Specific logic is as shown in Figure 6：
λ drift corrections：λ benchmark MAP is inquired by engine speed and distributive value first and obtains λ a reference values；Engine exists
It will be a certain deviation with λ a reference values due to the practical λ measured values of the influence suddenly accelerated when operation；λ measured values subtract λ benchmark and are worth to
λ deviations inquire λ drift corrections MAP together with the NOx value of original machine basis and obtain the λ drift correction values of NOx；
Intake air temperature drift correction：First by engine speed and distributive value inquire intake air temperature benchmark MAP obtain into
Temperature degree a reference value；Intake air temperature measured value subtracts intake air temperature benchmark and is worth to intake air temperature deviation, with original machine basis NOx
Value inquires intake air temperature drift correction MAP and obtains the intake air temperature drift correction value of NOx together；
Engine water temperature drift correction：Engine water temperature benchmark MAP is inquired by engine speed and distributive value first to obtain
To engine water temperature a reference value；Engine water temperature measurements subtract engine water temperature benchmark and are worth to engine water temperature deviation,
The engine water temperature drift correction value of NOx is obtained with engine water temperature drift correction MAP is inquired together with the NOx value of original machine basis；
Atmospheric humidity drift correction：λ benchmark MAP is inquired by engine speed and distributive value first and obtains atmospheric humidity base
Quasi- value；Atmospheric humidity measured value subtracts atmospheric humidity benchmark and is worth to atmospheric humidity deviation, is looked into together with the NOx value of original machine basis
It askes atmospheric humidity drift correction MAP and obtains the atmospheric humidity drift correction value of NOx；
The λ drift corrections value of NOx, the intake air temperature drift correction value of NOx, the engine water temperature drift correction value of NOx,
The atmospheric humidity drift correction value of NOx is added to obtain NOx correction amounts；
Original machine stable state NOx value obtained by calibrating is that original machine basis NOx value adds NOx correction amounts.
3）In view of engine transient changes the influence to original machine NOx value：The transient changing i.e. under same engine operating mode
Difference is had with original machine NOx value when stable state, therefore present invention adds NOx transient state correcting modules.First by engine speed,
Transient state filtering time t when distributive value inquiry transient state filtering time MAP obtains different operating modes, then by the revised NOx value of original machine
Stable state NOx value i.e. above carries out first-order filtering according to transient state filtering time t, obtains the revised NOx value of transient state.Such as Fig. 7 institutes
Show；
（Three）NOx path selection modules；
NOx path selection modules judge that final original machine NOx output valves come from the first path or second according to judgment value
Kind path；Judgment value depends on two factors：1, NOx sensor signal credibility MAP is looked by engine speed and distributive value,
Whether credible obtain NOx sensor signal under current working；2, NOx sensor quantity of state；If NOx sensor signal is credible, and
NOx sensor quantity of state indicates that NOx sensor is in normal operating conditions, then original machine NOx output valves come from the first path；Its
Remaining situation original machine NOx output valves come from second of path.Specific logic is as shown in Figure 8.
Claims (6)
1. a kind of computational methods of engine original machine NOx value, which is characterized in that including two paths；
First paths are measured by NOx sensor and obtain the first original machine NOx value after correcting；
Second paths obtain original machine basis NOx value by the original machine basis NOx value MAP of engine current working inquiry calibration,
And by obtaining the second original machine NOx value after amendment；
Select the output of one of two paths defeated as original machine NOx under engine current working by NOx path selection modules
Go out value；
First paths specifically include：
NOx sensor signal processing module receives the signal of NOx sensor input first, and in the processing of this NOx sensor signal
NOx sensor signal is filtered in module to obtain filtered NOx sensor measured value；
Then back pressure amendment and NO2 coefficient amendments are exhausted to NOx sensor measured value, obtain revised NOx sensor
Value is used as the first original machine NOx value；
It is described that back pressure amendment and NO2 coefficient amendments are exhausted to NOx sensor measured value in first paths, it specifically includes：
1) exhaust back pressure correction factor is obtained：
Pressure difference, the diesel oil that exhaust back pressure at NOx sensor is generated by ambient value, diesel oxidation catalyst DOC
The pressure difference that machine grain catcher DPF is generated is added to obtain with the selective catalytic reduction device SCR pressure differences generated；
Exhaust back pressure obtains exhaust back pressure with NOx sensor input value common query back pressure amendment MAP and is repaiied to NOx measuring signals
Positive coefficient, that is, exhaust back pressure correction factor；
2) NO2 correction factors are obtained：
Original machine NO2/NOx ratio MAP are inquired by engine speed, distributive value, the ratio that can obtain original machine NO2 and NOx closes
System；According to NO2/NOx ratios and NOx sensor measured value common query NO2 correction factor MAP, NO2 when different operating modes is obtained
Correction factor；
3) the revised NOx sensor value that the first paths obtain is multiplied by back pressure for filtered NOx sensor measured value and repaiies
Positive coefficient and NO2 correction factors.
2. the computational methods of engine original machine NOx value as described in claim 1, it is characterised in that：
The pressure difference of pressure difference, the SCR generations of selective catalytic reduction device that diesel oxidation catalyst DOC is generated passes through engine
Tach signal and distributive value signal inquire DOC back pressure MAP tables respectively and SCR back pressure MAP tables obtain.
3. the computational methods of engine original machine NOx value as claimed in claim 1 or 2, it is characterised in that：
Second paths specifically include：
1）Original machine basis NOx value MAP is inquired by engine speed, distributive value first, obtains original machine basis NOx value；
2）Then consider the shadow of air excess factor, intake air temperature, engine water temperature and atmospheric humidity to original machine basis NOx value
It rings, obtains NOx correction amounts；Original machine basis NOx value obtains original machine stable state NOx value obtained by calibrating plus NOx correction amounts；
3）Transient state amendment finally is carried out according to present engine rotating speed, distributive value to stable state NOx value, it is revised to obtain transient state
NOx value i.e. the second original machine NOx value.
4. the computational methods of engine original machine NOx value as claimed in claim 3, it is characterised in that：
The influence for considering air excess factor, intake air temperature, engine water temperature and atmospheric humidity to original machine basis NOx value,
NOx correction amounts are obtained, are obtained by following step：
λ drift corrections：λ benchmark MAP is inquired by engine speed and distributive value first and obtains λ a reference values；Engine is being run
When will be a certain deviation with λ a reference values due to the practical λ measured values of the influence suddenly accelerated；λ measured values subtract λ benchmark, and to be worth to λ inclined
Difference inquires λ drift corrections MAP together with the NOx value of original machine basis and obtains the λ drift correction values of NOx；
Intake air temperature drift correction：Intake air temperature benchmark MAP is inquired by engine speed and distributive value first to obtain into temperature
Spend a reference value；Intake air temperature measured value subtracts intake air temperature benchmark and is worth to intake air temperature deviation, with original machine basis NOx value one
The intake air temperature drift correction value of NOx is obtained with inquiry intake air temperature drift correction MAP；
Engine water temperature drift correction：Engine water temperature benchmark MAP is inquired by engine speed and distributive value first to be sent out
Motivation water temperature a reference value；Engine water temperature measurements subtract engine water temperature benchmark and are worth to engine water temperature deviation, with original
Machine basis NOx value inquires engine water temperature drift correction MAP and obtains the engine water temperature drift correction value of NOx together；
Atmospheric humidity drift correction：λ benchmark MAP is inquired by engine speed and distributive value first and obtains atmospheric humidity benchmark
Value；Atmospheric humidity measured value subtracts atmospheric humidity benchmark and is worth to atmospheric humidity deviation, is inquired together with the NOx value of original machine basis
Atmospheric humidity drift correction MAP obtains the atmospheric humidity drift correction value of NOx；
The λ drift corrections value of NOx, the intake air temperature drift correction value of NOx, the engine water temperature drift correction value of NOx, NOx
Atmospheric humidity drift correction value is added to obtain NOx correction amounts.
5. the computational methods of engine original machine NOx value as claimed in claim 3, it is characterised in that：
Described carries out transient state amendment to stable state NOx value according to present engine rotating speed, distributive value, specifically includes：
Transient state filtering time t when transient state filtering time MAP obtains different operating modes is inquired by engine speed, distributive value, then
The revised NOx value of original machine, that is, stable state NOx value is subjected to first-order filtering according to transient state filtering time t, it is revised to obtain transient state
NOx value.
6. the computational methods of engine original machine NOx value as described in claim 1, it is characterised in that：
The NOx path selection modules judge that final original machine NOx output valves come from the first paths or second according to judgment value
Paths；Judgment value depends on two factors：1, NOx sensor signal credibility MAP is looked by engine speed and distributive value,
Whether credible obtain NOx sensor signal under current working；2, NOx sensor quantity of state；If NOx sensor signal is credible, and
NOx sensor quantity of state indicates that NOx sensor is in normal operating conditions, then original machine NOx output valves come from the first paths；Its
Remaining situation original machine NOx output valves come from the second paths.
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