CN115754143A - Excavator emission test system and method and excavator - Google Patents
Excavator emission test system and method and excavator Download PDFInfo
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Abstract
The embodiment of the specification provides an excavator emission test system, a method and an excavator, and the excavator emission test system comprises a PEMS test system, a remote monitoring system and a local terminal; the PEMS testing system is used for collecting engine instantaneous NOx emission measurement values and engine ECU information of different working conditions under different gears within preset total testing time; the remote monitoring system is used for remotely acquiring engine ECU information sent by the vehicle unloading machine under different working conditions at different gears; the local terminal is used for carrying out consistency comparison on the engine ECU information forwarded by the PEMS test system and the engine ECU information acquired by the remote monitoring system, and estimating the NOx emission m of the engine with unit work under different working conditions at different gears in real time when the comparison is passed NOx . The embodiment of the specification realizes real-time monitoring of pollutant emission in the collection processThe purpose of (1).
Description
Technical Field
The embodiment of the specification relates to the technical field of excavators, in particular to an excavator emission testing system and method and an excavator.
Background
In the operation process of the excavator, a diesel engine is used for carrying out various operations such as digging, walking, bulldozing and the like, so that a certain amount of pollutant emission exists, and environmental pollution is caused.
The requirements for pollutant emission in the excavator are increasingly strict. In the prior art, a PEMS test system is mainly used for collecting emission data of an excavator within a certain test time. After the collection is finished, the collected data are processed and calculated through post-processing software, and the whole discharge result of the excavator is obtained. Such a test method cannot monitor pollutant emissions in real time during the collection process.
Disclosure of Invention
The embodiment of the specification provides an excavator emission test system, an excavator emission test method and an excavator, so that pollutant emission is monitored in real time in the collection process.
In order to achieve the above object, in a first aspect, an embodiment of the present specification provides an excavator emission testing system, including a PEMS testing system, a remote monitoring system, and a local terminal;
the PEMS test system: the system comprises a WIFI expander, a local terminal and a control module, wherein the WIFI expander is used for acquiring engine instantaneous NOx emission measurement values and engine ECU information under different working conditions and different gears within preset total test time and forwarding the engine instantaneous NOx emission measurement values and the engine ECU information to the local terminal through the WIFI expander; the ECU information of the engine comprises the instantaneous power of the engine, the instantaneous oil consumption of the engine, the instantaneous air inflow of the engine, the instantaneous torque percentage of the engine and the instantaneous rotating speed of the engine;
the remote monitoring system is used for remotely acquiring engine ECU information sent by the vehicle unloading machine under different working conditions at different gears;
the local terminal is used for comparing the consistency of the engine ECU information forwarded by the PEMS testing system with the engine ECU information acquired by a remote monitoring system: only when the consistency is rightWhen passing, the following formula is adopted to estimate the NOx emission m of the unit work of the engine under different working conditions and different gears in real time NOx ，
Wherein N is T Calculating the instantaneous NOx emission of an engine, N 1 As a measure of instantaneous NOx emissions from the engine, W T Is the instantaneous power of the engine, W 1 Is the instantaneous air input of the engine, C 1 For instantaneous oil consumption, T, of the engine 1 As percent of instantaneous engine torque, T 2 For engine reference torque, S 1 Is the instantaneous engine speed.
With reference to the first aspect, further, the local terminal includes a data acquisition module, a data processing module, and an alarm module;
the data acquisition module: the device is used for acquiring the information of the engine ECU through the CAN acquisition unit in a remote acquisition manner;
the data processing module: the engine ECU information which is transmitted by the PEMS test system is compared with the engine ECU information which is acquired by the remote monitoring system in a consistency mode, and the NOx emission m of the engine with unit work under different working conditions and different gears is estimated in real time when the consistency comparison is passed NOx ；
The alarm module is: and the electronic control unit is used for sending out an alarm signal when the engine ECU information forwarded by the PEMS test system is inconsistent with the engine ECU information acquired by the remote monitoring system.
With reference to the first aspect, further, the local terminal is further configured to:
measuring the instantaneous NOx emission quantity N of the engine 1 Substituting the regression equation into the pre-constructed regression equation, and calculating a correlation coefficient by adopting a least square method according to a calculation result of the regression equation;
measuring the collected instantaneous NOx emission quantity of the engine according to the correlation coefficient 1 The validity of (2) is judged: if the correlation coefficient is within the preset interval, the acquired engine instantaneous NOx emission measurement value N 1 If not, rejecting the currently collected engine instantaneous NOx emission measurement value N 1 New measured value N of instantaneous NOx emission of engine is collected again 1 ；
Wherein the expression of the regression equation is as follows:
N′ 1 ＝aN 0 +b
the calculation formula of the correlation coefficient is as follows:
wherein a is the slope of the predetermined regression equation, and b is the constant coefficient of the predetermined regression equation; n is a radical of 0 Is the last instant NOx emission test value of the engine, N' 1 To fit the resulting instantaneous NOx emissions of the engine at the current time,
mean engine NOx emissions.
With reference to the first aspect, further, the operating conditions include digging, leveling, walking, dozing, suppressing pressure, and idling, and the gears include a highest gear, an economic gear, and a lowest gear;
the test time of each working condition under each gear is calculated and obtained through the following formula:
t＝2h×β×g
wherein 2h is total test time, beta is working condition weight, and g is gear weight.
With reference to the first aspect, the local terminal is further configured to classify the acquired data according to different working conditions and gears, check validity of the classified data, calculate window power and NOx window emissions of different working conditions and gears by using a power base window, and calculate NOx window specific emissions of different working conditions and gears according to the window power and NOx window emissions; wherein the validity check at least comprises one of drift amount check of the gas analyzer, time alignment of collected data, validity check of the collected data and invalid data elimination.
With reference to the first aspect, further, the PEMS testing system includes
A gas analyzer: the method comprises the steps of acquiring measured values of instantaneous NOx emission of the engine under different working conditions and different gears within a preset total test time;
a main controller: the method is used for collecting the information of the engine ECU under different working conditions and different gears in the preset total test time.
With reference to the first aspect, further, the PEMS testing system further includes a pitot tube flowmeter, where the pitot tube flowmeter is configured to collect an exhaust flow rate of an engine exhaust pipe.
In a second aspect, embodiments of the present description provide an excavator equipped with an excavator emission testing system according to any one of the first aspect.
In a third aspect, an embodiment of the present specification provides an excavator emission testing method, including:
acquiring a measured value N of the instantaneous NOx emission of the engine by a PEMS test system aiming at different working conditions and different gears in preset total test time 1 The engine ECU information comprises engine instantaneous power, engine instantaneous oil consumption, engine instantaneous air inflow, engine instantaneous torque percentage and engine instantaneous rotating speed;
remotely acquiring engine ECU information sent by the vehicle unloading machine under different working conditions at different gears through the remote monitoring system;
and comparing the consistency of the engine ECU information acquired by the PEMS test system with the engine ECU information acquired by the remote monitoring system: the following formula is used in real time only when the consistency comparison passesEstimating the NOx emission m of the engine with unit work under different working conditions and different gears NOx ，
Wherein N is T Calculating the instantaneous NOx emission of the engine, W T For instantaneous power of the engine, N 1 As a measure of instantaneous engine NOx emissions, W 1 Is the instantaneous air intake of the engine, C 1 For instantaneous oil consumption of the engine, T 1 Is the percent of instantaneous torque, T, of the engine 2 For engine reference torque, S 1 Is the instantaneous engine speed.
With reference to the third aspect, further, the method further includes:
classifying the acquired ECU information of the engine according to different working conditions and gears, calculating window work and NOx window emission of different working conditions and gears by using a power base window, and calculating NOx window specific emission of different working conditions and gears according to the window work and NOx window emission.
As can be seen from the above, in the embodiments of the present specification, the measured values of the instantaneous NOx emissions of the engine under different working conditions in different gears and the ECU information of the engine under different working conditions in different gears are collected within a predetermined total test time, and the NOx emissions m per unit work of the engine under different working conditions in different gears is estimated in real time by using a rapid estimation method of the NOx emissions according to the received ECU information of the engine NOx The method can estimate the nitrogen oxide emission level of multiple working conditions and gears in real time, provides an emission optimization idea for engineers in the test process, and solves the problem that the test result can be obtained only by adopting a PEMS test system and needing aftertreatmentAnd multi-gear testing under each working condition is beneficial to comprehensively and finely analyzing the nitrogen oxide emission characteristics of the excavator, and the repeatability and the reproducibility of the testing are facilitated.
Drawings
In order to more clearly illustrate the embodiments of the present specification or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, the drawings in the following description are only some embodiments described in the present specification, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of an excavator emission testing system in an embodiment of the present disclosure;
FIG. 2 is a flowchart illustrating the consistency determination performed by the data processing module in the embodiment of the present disclosure;
FIG. 3 is a flow chart of NOx estimation in an embodiment of the present description;
FIG. 4 is a flow chart of the computation of a post-processing module in an embodiment of the present description;
FIG. 5 is a graphical representation of specific NOx emissions calculated in an embodiment of the present description for different operating conditions and different gears.
Detailed Description
The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present specification without any creative effort belong to the protection scope of the embodiments in the present specification.
The first embodiment is as follows:
an embodiment of the present specification provides an excavator emission test system, and referring to fig. 1, the excavator emission test system may include a PEMS test system, a remote monitoring system, and a local terminal.
The PEMS test system may include a gas analyzer, a master controller, and a WIFI extender;
the gas analyzer can be used for collecting the measured values of the instantaneous NOx emission of the engine under different working conditions and different gears within the preset total test time;
the main controller can be used for collecting engine ECU information of different working conditions under different gears in a preset total test time, wherein the engine ECU information can comprise engine instantaneous power, engine instantaneous oil consumption, engine instantaneous air inflow, engine instantaneous torque percentage and engine instantaneous rotating speed;
the WIFI expander enhances the engine ECU information transmitted by the main controller and then transmits the enhanced engine ECU information to the local terminal;
the remote monitoring system is arranged on a test site and used for acquiring engine ECU information sent by the vehicle unloading machine under different working conditions at different gears and remotely sending the information to the local terminal.
The local terminal may be configured with an evaluation module for consistency-comparing engine ECU information forwarded by the PEMS test system with engine ECU information collected by the remote monitoring system: and only when the consistency comparison passes, estimating the NOx emission m of the unit work of the engine under different working conditions at different gears in real time through the following formula NOx ：
Wherein N is T Calculating the instantaneous NOx emission of an engine, N 1 As a measure of instantaneous NOx emissions from the engine, W T For instantaneous power of the engine, W 1 For instantaneous admission of engineAmount of gas, C 1 For instantaneous oil consumption, T, of the engine 1 Is the percent of instantaneous torque, T, of the engine 2 For engine reference torque, S 1 Is the instantaneous engine speed. Note that the engine instantaneous intake air amount W 1 And instantaneous oil consumption C of engine 1 And adopting mass units and carrying out summation operation based on the mass conservation law.
Referring to fig. 2, in some embodiments, the local terminal may further include a data acquisition module, a data processing module, and an alarm module;
the data acquisition module CAN be used for acquiring engine ECU information through a CAN (controller area network) collector;
the data processing module can be used for comparing the data consistency of the engine ECU information acquired by the remote monitoring system and the engine ECU information sent by the PEMS test system, and transmitting the engine ECU information to the estimation module only when the data consistency is obtained;
the alarm module can be used for sending out an alarm signal when the data contrast is inconsistent.
The CAN collector CAN comprise a CAN-to-WIFI communication module and a WIFI-to-CAN communication module, and the CAN-to-WIFI communication module CAN be arranged on a vehicle machine site and used for releasing engine ECU information collected by the vehicle machine; WIFI changes CAN communication module CAN set up in local terminal for receive the engine ECU information that CAN changes WIFI communication module and sends in certain extent.
As an embodiment, if the error of the information of the engine ECU acquired by the PEMS testing system and the information of the engine ECU acquired by the remote monitoring system exceeds 3%, the data contrast is determined to be inconsistent.
In some embodiments, the local terminal may further include a validity determination module, see fig. 3, for measuring the instantaneous NOx emission of the engine by a measurement N 1 Substituting into a pre-constructed regression equation, calculating a correlation coefficient by adopting a least square method according to a calculation result of the regression equation, and measuring the acquired instantaneous NOx emission value N of the engine according to the correlation coefficient 1 The validity of (2) is judged: if the correlation coefficient is within the preset interval, the collected correlation coefficient isEngine instantaneous NOx emissions measurement N 1 If the measured value N is valid, the data is rejected, and a new measured value N of the instantaneous NOx emission of the engine is acquired again 1 ；
Wherein the expression of the regression equation is as follows:
N′ 1 ＝aN 0 +b
the calculation formula of the correlation coefficient is as follows:
wherein a is the slope of the predetermined regression equation, and b is the constant coefficient of the predetermined regression equation; n is a radical of hydrogen 0 For the last instant engine instantaneous NOx emission test value, corresponding, N 1 、N′ 1 、
All can be understood as parameters of the current moment, specifically, N' 1 To fit the resulting instantaneous NOx emissions of the engine at the current time,
mean engine NOx emissions.
As an embodiment of the present invention, if the slope a and the correlation coefficient r in the regression equation 2 A is more than or equal to 0.9 and less than or equal to 1.1 and r 2 And if the data is more than or equal to 0.8, the data is considered to be valid, otherwise, the data is collected again.
In some embodiments, the operating conditions may include digging, leveling, walking, dozing, holding, idling, and the gears may include a highest gear, an economic gear, and a lowest gear;
the test time of each working condition under each gear can be calculated and obtained through the following formula:
t＝2h×β×g
wherein 2h is the total test time, and can be selected to be 2 hours in the embodiment of the invention; beta is the weight of the working condition, and g is the weight of the gear.
In some embodiments, the local terminal may further include a post-processing module, please refer to fig. 4, where the post-processing module is configured to classify the collected data according to different operating conditions and gears, calculate window power and NOx window emissions of the different operating conditions and gears by using the power base window, and calculate NOx window specific emissions of the different operating conditions and gears according to the window power and the NOx window emissions.
In an embodiment of the invention, window work is calculated using a window work code, window work = IF (whether a window is active = ", OFFSET (cumulative work, window time, 0,1,1) -cumulative work).
The NOx window emissions, NOx window emissions = IF (whether the window is valid = ", OFFSET (cumulative emissions, window time, 0,1,1) — cumulative emissions) are calculated using the NOx window emissions code.
Cumulative emissions are calculated using a cumulative emissions code, cumulative emissions = IF (power = "", window average power percentage).
The NOx window specific emissions are calculated using the NOx window specific emissions code, NOx window specific emissions = IF (whether the window is valid = "", NOx window emissions/window work).
Optionally, the calculated NOx window specific emission is plotted in a radar chart as shown in fig. 5, so that the NOx specific emission level under certain weight of each working condition and each gear is clearly and intuitively obtained, and the locking of the emission level under the most adverse condition by a test engineer is facilitated.
Furthermore, the post-processing module can be further used for carrying out validity check on the power-based window after the collected data are classified according to different working conditions and gears, wherein the validity check at least comprises one of drift check of the gas analyzer, time alignment of the collected data, valid check of the collected data and invalid data elimination.
Further, the PEMS test system can also comprise a Pitot tube flowmeter, and the Pitot tube flowmeter can be used for collecting the exhaust flow of an engine exhaust pipe.
In summary, in the embodiments of the present description, engine instantaneous NOx emission measurements at different gear levels for different operating conditions are collected over a predetermined total test timeThe method comprises the steps of measuring the value and the engine ECU information of different working conditions under different gears, adopting a rapid nitrogen oxide emission estimation method according to the received engine ECU information, and estimating the NOx emission m of the engine unit work under different working conditions under different gears in real time NOx The emission level of the nitrogen oxides under multiple working conditions and gears can be estimated in real time, an emission optimization idea is provided for engineers in the testing process, the defect that a testing result can be obtained only by adopting a PEMS testing system through aftertreatment is overcome, and the multiple-gear testing under each working condition is beneficial to comprehensively and finely analyzing the emission characteristics of the nitrogen oxides of the excavator and is beneficial to the repeatability and reproducibility of the testing. The remote monitoring system and the PEMS testing system are used for achieving information acquisition, data operation is conducted through the local terminal, a testing result is obtained, and personal safety of testing personnel can be guaranteed.
Example two:
the embodiment of the specification provides an excavator, and the excavator is provided with the excavator emission testing system in the first embodiment.
Example three:
the embodiment of the specification provides an excavator emission testing method, which can be implemented on the basis of the testing system of the first embodiment, and the method comprises the following steps,
the method comprises the following steps: acquiring a measured value N of the instantaneous NOx emission of the engine by a PEMS test system aiming at different working conditions and different gears in preset total test time 1 The engine ECU information comprises engine instantaneous power, engine instantaneous oil consumption, engine instantaneous air inflow, engine instantaneous torque percentage and engine instantaneous rotating speed;
step two: remotely acquiring engine ECU information sent by a vehicle unloading machine under different working conditions at different gears through the remote monitoring system;
step three: and comparing the consistency of the engine ECU information acquired by the PEMS test system with the engine ECU information acquired by the remote monitoring system: and when the consistency comparison is passed, estimating the NOx of the engine with unit work under different working conditions at different gears in real time by adopting the following formulaDischarge m NOx ，
Wherein N is T Calculating the instantaneous NOx emission of the engine, W T For instantaneous power of the engine, N 1 As a measure of instantaneous NOx emissions from the engine, W 1 Is the instantaneous air intake of the engine, C 1 For instantaneous oil consumption of the engine, T 1 As percent of instantaneous engine torque, T 2 For engine reference torque, S 1 Is the instantaneous engine speed.
In some embodiments, the method, further comprising,
classifying the acquired ECU information of the engine according to different working conditions and gears, calculating window work and NOx window emission of different working conditions and gears by using a power base window, and calculating NOx window specific emission of different working conditions and gears according to the window work and NOx window emission. Please refer to fig. 5, which shows the specific NOx emissions under certain weight for each operating condition and each gear.
It should be understood that: the above method steps merely show the logical order of the method described in this embodiment, and on the premise of not conflicting with each other, in other possible embodiments of the present invention, the method steps may be completed in an order different from the order described in the above method steps: such as step one and step two, either simultaneously or sequentially.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present embodiments. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the embodiments herein. Thus, the described embodiments are not intended to be limited to the embodiments shown herein but are to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The excavator emission test system is characterized by comprising a PEMS test system, a remote monitoring system and a local terminal;
the PEMS test system: the system comprises a WIFI expander, a local terminal and a control module, wherein the WIFI expander is used for acquiring engine instantaneous NOx emission measurement values and engine ECU information under different working conditions and different gears within preset total test time and forwarding the engine instantaneous NOx emission measurement values and the engine ECU information to the local terminal through the WIFI expander; the ECU information of the engine comprises the instantaneous power of the engine, the instantaneous oil consumption of the engine, the instantaneous air inflow of the engine, the instantaneous torque percentage of the engine and the instantaneous rotating speed of the engine;
the remote monitoring system is used for remotely acquiring engine ECU information sent by the vehicle unloading machine under different working conditions at different gears;
the local terminal is used for carrying out consistency comparison on the engine ECU information forwarded by the PEMS testing system and the engine ECU information collected by the remote monitoring system: and only when the consistency comparison is passed, estimating the NOx emission m of the unit work of the engine under different working conditions in different gears in real time by adopting the following formula NOx ，
Wherein N is T To startCalculated value of instantaneous NOx emission, N 1 As a measure of instantaneous engine NOx emissions, W T For instantaneous power of the engine, W 1 Is the instantaneous air intake of the engine, C 1 For instantaneous oil consumption of the engine, T 1 As percent of instantaneous engine torque, T 2 For engine reference torque, S 1 Is the instantaneous engine speed.
2. The excavator emission testing system of claim 1 wherein the local terminal comprises a data acquisition module, a data processing module and an alarm module;
the data acquisition module: the device is used for acquiring the information of the engine ECU through the CAN acquisition unit in a remote acquisition manner;
the data processing module: the engine ECU information transmitted by the PEMS test system is compared with the engine ECU information acquired by the remote monitoring system in a consistency manner, and the NOx emission m of the engine unit work under different working conditions at different gears is estimated in real time when the consistency comparison is passed NOx ；
The alarm module is: and the electronic control unit is used for sending out an alarm signal when the engine ECU information forwarded by the PEMS test system is inconsistent with the engine ECU information acquired by the remote monitoring system.
3. The excavator emission testing system of claim 1 wherein the local terminal is further configured to:
measuring the instantaneous NOx emission quantity N of the engine 1 Substituting the regression equation into the pre-constructed regression equation, and calculating a correlation coefficient by adopting a least square method according to a calculation result of the regression equation;
measuring value N of collected instantaneous NOx emission of engine according to correlation coefficient 1 The validity of (2) is judged: if the correlation coefficient is within the preset interval, the acquired engine instantaneous NOx emission measurement value N 1 If not, rejecting the currently collected engine instantaneous NOx emission measurement value N 1 New measured value N of instantaneous NOx emission of engine is collected again 1 ；
Wherein the expression of the regression equation is as follows:
N′ 1 ＝aN 0 +b
the calculation formula of the correlation coefficient is as follows:
wherein a is the slope of the predetermined regression equation, and b is the constant coefficient of the predetermined regression equation; n is a radical of 0 Is the last moment engine instantaneous NOx emission test value, N' 1 To fit the resulting instantaneous NOx emissions of the engine at the current time,
mean engine NOx emissions.
4. The excavator emission testing system of claim 1 wherein the operating conditions include digging, leveling, walking, dozing, holding, idling, and the gears include a highest gear, an economic gear, and a lowest gear;
the test time of each working condition under each gear is calculated and obtained through the following formula:
t＝2h×β×g
wherein 2h is total test time, beta is working condition weight, and g is gear weight.
5. The excavator emission testing system of claim 1 wherein the local terminal is further configured to classify the collected data according to different operating conditions and gears, to check validity of the classified data, to calculate window power and NOx window emissions for different operating conditions and gears using a power-based window, and to calculate NOx window specific emissions for different operating conditions and gears according to the window power and NOx window emissions; wherein the validity check at least comprises one of drift amount check of the gas analyzer, time alignment of collected data, validity check of the collected data and invalid data elimination.
6. The excavator emission testing system of claim 5 wherein the PEMS testing system includes
A gas analyzer: the method comprises the steps of acquiring measured values of instantaneous NOx emission of the engine under different working conditions and different gears within a preset total test time;
a main controller: the method is used for collecting the information of the engine ECU under different working conditions and different gears in the preset total test time.
7. The excavator emission testing system of claim 6 further comprising a pitot tube flow meter for collecting exhaust flow from an engine exhaust pipe.
8. An excavator, wherein the excavator is fitted with an excavator emission testing system as claimed in any one of claims 1 to 7.
9. An excavator emission testing method is executed by a remote monitoring system, and is characterized by comprising the following steps:
acquiring a measured value N of the instantaneous NOx emission of the engine by a PEMS test system aiming at different working conditions and different gears in preset total test time 1 And engine ECU information, the said engine ECU information includes the instantaneous power of the engine, instantaneous oil consumption of the engine, instantaneous air input of the engine, instantaneous torque percentage of the engine, instantaneous rotational speed of the engine;
remotely acquiring engine ECU information sent by the vehicle unloading machine under different working conditions at different gears through the remote monitoring system;
and carrying out consistency comparison on the engine ECU information acquired by the PEMS test system and the engine ECU information acquired by the remote monitoring system: and only when the consistency comparison is passed, estimating the NOx emission m of the unit work of the engine under different working conditions in different gears in real time by adopting the following formula NOx ，
Wherein N is T Calculating the instantaneous NOx emission of the engine, W T For instantaneous power of the engine, N 1 As a measure of instantaneous engine NOx emissions, W 1 Is the instantaneous air intake of the engine, C 1 For instantaneous oil consumption of the engine, T 1 Is the percent of instantaneous torque, T, of the engine 2 For engine reference torque, S 1 Is the engine instantaneous speed.
10. The method of claim 9, further comprising:
classifying the acquired ECU information of the engine according to different working conditions and gears, calculating window work and NOx window emission of different working conditions and gears by using a power base window, and calculating NOx window specific emission of different working conditions and gears according to the window work and NOx window emission.
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