CN106014571A - Method for calculating original engine NOx values of engines - Google Patents
Method for calculating original engine NOx values of engines Download PDFInfo
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- CN106014571A CN106014571A CN201610374590.3A CN201610374590A CN106014571A CN 106014571 A CN106014571 A CN 106014571A CN 201610374590 A CN201610374590 A CN 201610374590A CN 106014571 A CN106014571 A CN 106014571A
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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
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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
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention provides a method for calculating original engine NOx values of engines. The method comprises two paths, wherein the first path includes carrying out measurement and correction through an NOx sensor to obtain a first original engine NOx value; the second path includes inquiring a calibrated original engine basic NOx value MAP through the current working condition of an engine so as to obtain an original engine basic NOx value, and carrying out correction to obtain a second original engine NOx value; and selecting output of one of the two paths as an original engine NOx output value through an NOx path selection module under the current working condition of the engine. According to the method provided by the invention, correct upstream NOx value input can be provided for SCR urea injection systems, so that accurate urea injection control is performed.
Description
Technical field
The present invention relates to motor exhaust processing technology field, the computational methods of a kind of electromotor former machine NOx value.
Background technology
At present, SCR(SCR) post-processing technology is NOx(nitrogen oxides in state four, state five and state six Reduction for Diesel Engines low exhaust gas) technical way.Judge the NOx value in diesel engine vent gas the most exactly, determine SCR post processing control system and can control urea injecting quantity exactly, prevent SCR conversion efficiency not enough or NH_3 leakage is too much.Therefore, accurately judge that the NOx value in diesel engine vent gas is most important.
It is said that in general, the NOx value in calculating diesel engine vent gas has two kinds of methods: the first is by installing NOx sensor on diesel exhaust gas tail pipe, for measuring the NOx concentration in diesel engine vent gas；The second is to draw, by model calibration, the NOx concentration value or mass flow value that former machine discharges.
In first method, NOx sensor can measure the NOx concentration value in diesel engine vent gas in real time.Operation principle based on NOx sensor, NOx sensor operating temperature needs more than a minimum threshold values, when cold boot of diesel, delivery temperature typically can be less than this threshold values, therefore NOx sensor can not normally work, and SCR aftertreatment control unit cannot obtain the former machine NOx concentration value of diesel engine.It addition, NOx sensor is merely able to measure the NO in tail gas, and tail gas also have a small amount of NO2 cannot be arrived by sensor measurement.Therefore, simply use the former machine NOx value of NOx sensor measurement and there is certain drawback.
Second method is by demarcating former machine NOx emission value MAP(arteries and veins stave or arteries and veins spectrogram on engine pedestal), controller obtains NOx emission value during each engine operating condition by inquiry MAP.At present, the SCR control strategy of state four, state five mainly uses the method.But to state six stage, due to the impact of engine EGR system (EGR exhaust recirculating system), it is inaccurate only by demarcating NOx value MAP, needs to consider that EGR rate is on the impact of NOx emission value and other influence factor.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, the computational methods of a kind of electromotor former machine NOx value are provided, consider the former machine basis NOx value of NOx sensor measured value and demarcation, the output of suitable NOx value is selected according to engine operating condition and sensor states, upstream NOx value input accurately can be provided for SCR urea injection system, and then carry out accurate carbamide spraying fire.The technical solution used in the present invention is:
The computational methods of a kind of electromotor former machine NOx value, including two paths；
Article 1, path, obtains the first former machine NOx value after being measured by NOx sensor and revised；
Article 2 path, former machine basis NOx value MAP demarcated by the inquiry of electromotor current working obtains former machine basis NOx value, and by obtaining the second former machine NOx value after revising；
Select the output of one of two paths as former machine NOx output valve under electromotor current working by NOx path selection module.
Further, Article 1 path specifically includes:
First NOx sensor signal processing module receives the signal of NOx sensor input, and NOx sensor signal is filtered in this NOx sensor signal processing module process obtains filtered NOx sensor measured value；
Then NOx sensor measured value is exhausted back pressure correction and NO2 coefficient correction, obtains revised NOx sensor value as the first former machine NOx value.
Specifically, in Article 1 path, described NOx sensor measured value is exhausted back pressure correction and NO2 coefficient correction, specifically includes:
1) exhaust back pressure correction factor is obtained:
The pressure difference that pressure difference, the pressure difference of diesel particulate trap DPF generation and the SCR device SCR that exhaust back pressure at NOx sensor is produced by ambient value, diesel oxidation catalyst DOC produces is added and obtains；
Exhaust back pressure and NOx sensor input value common query back pressure correction MAP obtain exhaust back pressure and NOx measure the correction factor i.e. exhaust back pressure correction factor of signal；
2) NO2 correction factor is obtained:
Former machine NO2/NOx ratio MAP is inquired about, it is possible to obtain the ratio relation of former machine NO2 Yu NOx by engine speed, distributive value；According to NO2/NOx ratio and NOx sensor measured value common query NO2 correction factor MAP, obtain NO2 correction factor during different operating mode；
3) the revised NOx sensor value that Article 1 path obtains is that filtered NOx sensor measured value is multiplied by back pressure correction factor and NO2 correction factor.
Further, by engine rotational speed signal and distributive value signal inquires about DOC back pressure MAP table to the pressure difference that the pressure difference of diesel oxidation catalyst DOC generation, SCR device SCR produce respectively and SCR back pressure MAP table obtains.
Further, Article 2 path specifically includes:
1) first pass through engine speed, distributive value inquires about former machine basis NOx value MAP, obtains former machine basis NOx value；
2) then consider the impact on former machine basis NOx value of air excess factor, intake air temperature, engine water temperature and atmospheric humidity, obtain NOx correction；Former machine basis NOx value obtains former machine plus NOx correction and demarcates the stable state NOx value obtained；
3) finally stable state NOx value is carried out transient state correction according to present engine rotating speed, distributive value, obtain the former machine NOx value of the revised NOx value of transient state that is second.
Specifically, the impact on former machine basis NOx value of described consideration air excess factor, intake air temperature, engine water temperature and atmospheric humidity, obtain NOx correction, obtained by following step:
λ drift correction: first pass through engine speed and distributive value inquiry λ benchmark MAP obtains λ reference value；Electromotor operationally has certain deviation due to the anxious actual λ measured value that affects accelerated with λ reference value；λ measured value deducts λ reference value and obtains λ deviation value, together inquires about λ drift correction MAP with former machine basis NOx value and obtains the λ drift correction value of NOx；
Intake air temperature drift correction: first pass through engine speed and distributive value inquiry intake air temperature benchmark MAP obtains intake air temperature reference value；Intake air temperature measured value deducts intake air temperature reference value and obtains intake air temperature deviation value, together inquires about intake air temperature drift correction MAP with former machine basis NOx value and obtains the intake air temperature drift correction value of NOx；
Engine water temperature drift correction: first pass through engine speed and distributive value inquiry engine water temperature benchmark MAP obtains engine water temperature reference value；Engine water temperature measurements deducts engine water temperature reference value and obtains engine water temperature deviation value, together inquires about engine water temperature drift correction MAP with former machine basis NOx value and obtains the engine water temperature drift correction value of NOx；
Atmospheric humidity drift correction: first pass through engine speed and distributive value inquiry λ benchmark MAP obtains atmospheric humidity reference value；Atmospheric humidity measured value deducts atmospheric humidity reference value and obtains atmospheric humidity deviation value, together inquires about atmospheric humidity drift correction MAP with former machine basis NOx value and obtains the atmospheric humidity drift correction value of NOx；
The λ drift correction 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 are added and obtain NOx correction.
Specifically, described carries out transient state correction to stable state NOx value according to present engine rotating speed, distributive value, specifically includes:
By engine speed, distributive value inquiry transient state filtering time MAP obtains different operating mode time transient state filtering time t, more revised for former machine NOx value i.e. stable state NOx value is carried out first-order filtering according to transient state filtering time t, obtains the revised NOx value of transient state.
Further,
According to judgment value, described NOx path selection module judges that final former machine NOx output valve is from Article 1 path or Article 2 path；Judgment value depends on two factors: 1, look into NOx sensor signal credibility MAP by engine speed and distributive value, obtains NOx sensor signal under current working the most credible；2, NOx sensor quantity of state；If NOx sensor signal is credible, and NOx sensor quantity of state represents that NOx sensor is in normal operating conditions, and the most former machine NOx output valve is from Article 1 path；Remaining situation former machine NOx output valve is from Article 2 path.
It is an advantage of the current invention that:
1) consider the former machine basis NOx value of NOx sensor measured value and demarcation, calculate NOx value more accurate.
2) consider various modifying factor and ensure that the NOx value accuracy of calculating.
Accompanying drawing explanation
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 diagram of the present invention.
Fig. 5 is the former machine basis NOx value module diagram of the present invention.
Fig. 6 is the former machine NOx correcting module schematic diagram of the present invention.
Fig. 7 is the NOx transient state correcting module schematic diagram of the present invention.
Fig. 8 is the NOx path selection module schematic diagram of the present invention.
Detailed description of the invention
Below in conjunction with concrete drawings and Examples, the invention will be further described.
The computational methods of the electromotor former machine NOx value that the present invention proposes, illustrate, as it is shown in figure 1, the calculating path of diesel engine former machine NOx value has two as a example by diesel engine:
Article 1, path, obtains the first former machine NOx value after being measured by NOx sensor and revised；
Article 2 path, former machine basis NOx value MAP demarcated by the inquiry of electromotor current working obtains former machine basis NOx value, and by obtaining the second former machine NOx value after revising；
Then judge that the output selecting one of two paths under electromotor current working is as former machine NOx output valve by NOx path selection module.
(1) Article 1 path specifically includes:
First NOx sensor signal processing module receives the signal of NOx sensor input, and NOx sensor signal is filtered in this NOx sensor signal processing module process obtains filtered NOx sensor measured value；As shown in Figure 2；
The present invention considers exhaust back pressure and the NO2 impact on NOx sensor.Research shows that NOx sensor measured value is had a certain impact by different exhaust back pressures, therefore to obtain NOx measured value accurately, and add exhaust back pressure in the present invention affects coefficient.
1) exhaust back pressure correction factor is obtained by an exhaust back pressure correcting module；Before General N Ox sensor is arranged on diesel engine vent gas post-processing unit, diesel engine vent gas after-treatment components specifically includes that DOC (diesel oxidation catalyst), DPF(diesel particulate trap) and SCR(SCR device).Ignoring the impact of blank pipe, diesel engine back pressure is mainly produced by exhaust aftertreatment unit, and the pressure difference that pressure difference, the pressure difference of DPF generation and the SCR that therefore exhaust back pressure at NOx sensor can pass through ambient value, DOC produces produces is added and obtains.Pressure difference that wherein DOC produces and the pressure difference that SCR produces are by engine rotational speed signal and distributive value signal inquires about DOC back pressure MAP table respectively and SCR back pressure MAP table obtains, the pressure difference that DPF produces directly is measured by DPF differential pressure pickup and is obtained, and ambient pressure signal is obtained by ambient pressure sensor measurement.
Exhaust back pressure and NOx sensor input value common query back pressure correction MAP obtain exhaust back pressure and NOx measure the correction factor i.e. exhaust back pressure correction factor of signal, as shown in Figure 3；
2) obtain NO2 correction factor by a NO2 correcting module: use the NO2 correcting module main cause to be: NOx sensor principle caused it to assume in the course of the work all nitrogen oxides are all NO, and practical situation is nitrogen oxide in tail gas is made up of NO and NO2, the most about 90% is NO, NOX value that such sensor is measured and actual have deviation.Therefore the measured value of NO2 compensating approach NOx sensor is considered.The calculating logic of NO2 correcting module is: by engine speed, distributive value inquiry diesel engine former machine NO2/NOx ratio MAP, it is possible to obtain the ratio relation of former machine NO2 Yu NOx；According to NO2/NOx ratio and NOx sensor measured value common query NO2 correction factor MAP, obtain NO2 correction factor during different operating mode；As shown in Figure 4；
3) the revised NOx sensor value that Article 1 path obtains is that filtered NOx sensor measured value is multiplied by back pressure correction factor and NO2 correction factor.
(2) Article 2 path specifically includes:
1) former machine basis NOx value module is introduced；As shown in Figure 5:
Inquire about former machine basis NOx value MAP by engine speed, distributive value, obtain former machine basis NOx value (this is former machine NOx calibration value)；
Inquiring about former machine NO2/NOx ratio MAP by engine speed, distributive value, obtain NO2/NOx ratio during different operating mode, this NO2/NOx ratio is provided to the NO2 correcting module in Article 1 path；
2) former machine NOx correcting module is introduced:
Former machine NOx correcting module mainly considers the impact on former machine basis NOx value of air excess factor, intake air temperature, engine water temperature and atmospheric humidity, obtains NOx correction；Specifically logic is as shown in Figure 6:
λ drift correction: first pass through engine speed and distributive value inquiry λ benchmark MAP obtains λ reference value；Electromotor operationally has certain deviation due to the anxious actual λ measured value that affects accelerated with λ reference value；λ measured value deducts λ reference value and obtains λ deviation value, together inquires about λ drift correction MAP with former machine basis NOx value and obtains the λ drift correction value of NOx；
Intake air temperature drift correction: first pass through engine speed and distributive value inquiry intake air temperature benchmark MAP obtains intake air temperature reference value；Intake air temperature measured value deducts intake air temperature reference value and obtains intake air temperature deviation value, together inquires about intake air temperature drift correction MAP with former machine basis NOx value and obtains the intake air temperature drift correction value of NOx；
Engine water temperature drift correction: first pass through engine speed and distributive value inquiry engine water temperature benchmark MAP obtains engine water temperature reference value；Engine water temperature measurements deducts engine water temperature reference value and obtains engine water temperature deviation value, together inquires about engine water temperature drift correction MAP with former machine basis NOx value and obtains the engine water temperature drift correction value of NOx；
Atmospheric humidity drift correction: first pass through engine speed and distributive value inquiry λ benchmark MAP obtains atmospheric humidity reference value；Atmospheric humidity measured value deducts atmospheric humidity reference value and obtains atmospheric humidity deviation value, together inquires about atmospheric humidity drift correction MAP with former machine basis NOx value and obtains the atmospheric humidity drift correction value of NOx；
The λ drift correction 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 are added and obtain NOx correction；
The stable state NOx value obtained demarcated by former machine is that former machine basis NOx value is plus NOx correction.
3) impact on former machine NOx value is changed in view of engine transient: i.e. when transient changing and stable state, former machine NOx value has difference under same engine operating mode, therefore present invention adds NOx transient state correcting module.First pass through engine speed, transient state filtering time t time distributive value inquiry transient state filtering time MAP obtains different operating mode, again revised for former machine NOx value stable state NOx value the most above is carried out first-order filtering according to transient state filtering time t, obtain the revised NOx value of transient state.As shown in Figure 7；
(3) NOx path selection module；
According to judgment value, NOx path selection module judges that final former machine NOx output valve is from the first path or the second path；Judgment value depends on two factors: 1, look into NOx sensor signal credibility MAP by engine speed and distributive value, obtains NOx sensor signal under current working the most credible；2, NOx sensor quantity of state；If NOx sensor signal is credible, and NOx sensor quantity of state represents that NOx sensor is in normal operating conditions, and the most former machine NOx output valve is from the first path；Remaining situation former machine NOx output valve is from the second path.Concrete logic is as shown in Figure 8.
Claims (8)
1. the computational methods of an electromotor former machine NOx value, it is characterised in that include two paths；
Article 1, path, obtains the first former machine NOx value after being measured by NOx sensor and revised；
Article 2 path, former machine basis NOx value MAP demarcated by the inquiry of electromotor current working obtains former machine basis NOx value, and by obtaining the second former machine NOx value after revising；
Select the output of one of two paths as former machine NOx output valve under electromotor current working by NOx path selection module.
2. the computational methods of electromotor former machine NOx value as claimed in claim 1, it is characterised in that:
Article 1, path specifically includes:
First NOx sensor signal processing module receives the signal of NOx sensor input, and NOx sensor signal is filtered in this NOx sensor signal processing module process obtains filtered NOx sensor measured value；
Then NOx sensor measured value is exhausted back pressure correction and NO2 coefficient correction, obtains revised NOx sensor value as the first former machine NOx value.
3. the computational methods of electromotor former machine NOx value as claimed in claim 2, it is characterised in that:
Article 1, in path, described NOx sensor measured value is exhausted back pressure correction and NO2 coefficient correction, specifically includes:
1) exhaust back pressure correction factor is obtained:
The pressure difference that pressure difference, the pressure difference of diesel particulate trap DPF generation and the SCR device SCR that exhaust back pressure at NOx sensor is produced by ambient value, diesel oxidation catalyst DOC produces is added and obtains；
Exhaust back pressure and NOx sensor input value common query back pressure correction MAP obtain exhaust back pressure and NOx measure the correction factor i.e. exhaust back pressure correction factor of signal；
2) NO2 correction factor is obtained:
Former machine NO2/NOx ratio MAP is inquired about, it is possible to obtain the ratio relation of former machine NO2 Yu NOx by engine speed, distributive value；According to NO2/NOx ratio and NOx sensor measured value common query NO2 correction factor MAP, obtain NO2 correction factor during different operating mode；
3) the revised NOx sensor value that Article 1 path obtains is that filtered NOx sensor measured value is multiplied by back pressure correction factor and NO2 correction factor.
4. the computational methods of electromotor former machine NOx value as claimed in claim 3, it is characterised in that:
By engine rotational speed signal and distributive value signal inquires about DOC back pressure MAP table to the pressure difference that the pressure difference of diesel oxidation catalyst DOC generation, SCR device SCR produce respectively and SCR back pressure MAP table obtains.
5. the computational methods of the electromotor former machine NOx value as according to any one of Claims 1 to 4, it is characterised in that:
Article 2 path specifically includes:
1) first pass through engine speed, distributive value inquires about former machine basis NOx value MAP, obtains former machine basis NOx value；
2) then consider the impact on former machine basis NOx value of air excess factor, intake air temperature, engine water temperature and atmospheric humidity, obtain NOx correction；Former machine basis NOx value obtains former machine plus NOx correction and demarcates the stable state NOx value obtained；
3) finally stable state NOx value is carried out transient state correction according to present engine rotating speed, distributive value, obtain the former machine NOx value of the revised NOx value of transient state that is second.
6. the computational methods of electromotor former machine NOx value as claimed in claim 5, it is characterised in that:
The impact on former machine basis NOx value of described consideration air excess factor, intake air temperature, engine water temperature and atmospheric humidity, is obtained NOx correction, is obtained by following step:
λ drift correction: first pass through engine speed and distributive value inquiry λ benchmark MAP obtains λ reference value；Electromotor operationally has certain deviation due to the anxious actual λ measured value that affects accelerated with λ reference value；λ measured value deducts λ reference value and obtains λ deviation value, together inquires about λ drift correction MAP with former machine basis NOx value and obtains the λ drift correction value of NOx；
Intake air temperature drift correction: first pass through engine speed and distributive value inquiry intake air temperature benchmark MAP obtains intake air temperature reference value；Intake air temperature measured value deducts intake air temperature reference value and obtains intake air temperature deviation value, together inquires about intake air temperature drift correction MAP with former machine basis NOx value and obtains the intake air temperature drift correction value of NOx；
Engine water temperature drift correction: first pass through engine speed and distributive value inquiry engine water temperature benchmark MAP obtains engine water temperature reference value；Engine water temperature measurements deducts engine water temperature reference value and obtains engine water temperature deviation value, together inquires about engine water temperature drift correction MAP with former machine basis NOx value and obtains the engine water temperature drift correction value of NOx；
Atmospheric humidity drift correction: first pass through engine speed and distributive value inquiry λ benchmark MAP obtains atmospheric humidity reference value；Atmospheric humidity measured value deducts atmospheric humidity reference value and obtains atmospheric humidity deviation value, together inquires about atmospheric humidity drift correction MAP with former machine basis NOx value and obtains the atmospheric humidity drift correction value of NOx；
The λ drift correction 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 are added and obtain NOx correction.
7. the computational methods of electromotor former machine NOx value as claimed in claim 5, it is characterised in that:
Described carries out transient state correction to stable state NOx value according to present engine rotating speed, distributive value, specifically includes:
By engine speed, distributive value inquiry transient state filtering time MAP obtains different operating mode time transient state filtering time t, more revised for former machine NOx value i.e. stable state NOx value is carried out first-order filtering according to transient state filtering time t, obtains the revised NOx value of transient state.
8. the computational methods of electromotor former machine NOx value as claimed in claim 1, it is characterised in that:
According to judgment value, described NOx path selection module judges that final former machine NOx output valve is from Article 1 path or Article 2 path；Judgment value depends on two factors: 1, look into NOx sensor signal credibility MAP by engine speed and distributive value, obtains NOx sensor signal under current working the most credible；2, NOx sensor quantity of state；If NOx sensor signal is credible, and NOx sensor quantity of state represents that NOx sensor is in normal operating conditions, and the most former machine NOx output valve is from Article 1 path；Remaining situation former machine NOx output valve is from Article 2 path.
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