CN102230414B - SCR (Semiconductor Control Rectifier) control device, system and method - Google Patents

SCR (Semiconductor Control Rectifier) control device, system and method Download PDF

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CN102230414B
CN102230414B CN2011101462964A CN201110146296A CN102230414B CN 102230414 B CN102230414 B CN 102230414B CN 2011101462964 A CN2011101462964 A CN 2011101462964A CN 201110146296 A CN201110146296 A CN 201110146296A CN 102230414 B CN102230414 B CN 102230414B
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catalyst converter
scr catalyst
temperature
scr
infinitesimals
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CN102230414A (en
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孙少军
佟德辉
刘颖帅
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Weichai Power Co Ltd
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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
    • Y02T10/12—Improving ICE efficiencies
    • 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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Abstract

The invention provides an SCR (Semiconductor Control Rectifier) control device, an SCR control system and an SCR control method. The SCR control device comprises a temperature prediction device, a conversion rate obtaining device and an emission amount calculation device, wherein the temperature prediction device is used for predicting the temperature of an SCR catalytic converter; the conversion rate obtaining device is used for obtaining the conversion rate of the SCR catalytic converter according to the prediction temperature of the SCR catalytic converter and the revolving speed and the torque of the engine; the emission amount calculation device is used for calculating the urea emission amount to the SCR catalytic converter according to the NOx emission amount of the engine and the conversion rate of the SCR catalytic converter; and the temperature prediction device comprises a plurality of infinitesimals, a device for calculating the temperature of the infinitesimals according to the practical temperature and the physical parameters of the SCR catalytic converter and the exhaust flow of the engine and a device for calculating the temperature of the SCR catalytic converter according to the calculated temperature of the infinitesimals.

Description

A kind of SCR control gear, system and method
Technical field
The present invention relates to a kind of SCR control gear, SCR control system and SCR controlling method.
Background technique
For the diesel engine that satisfies state IV, state V discharging with the SCR post-processing technology, in steady state condition, the formulation of control strategy all is based on MAP figure, namely realizes based on empirical value and interpolation algorithm.The control strategy of present existing SCR open loop or closed loop can satisfy the demand for control of motor under the stable operation condition substantially, namely can be according to motor the conversion ratio of the NOx discharge amount under the stable operation condition and SCR catalyst converter, calculate to the urea injecting quantity of SCR catalyst converter.
But when motor was transitioned into another operating mode from an operating mode, namely in the situation of instantaneous conditions, the temperature of SCR catalyst converter can not reach rapidly with the variation of rotating speed and moment of torsion the temperature when stablizing.When motor is transitioned into the warm operating mode of high row from the warm operating mode of low row moment, engine speed and moment of torsion that the SCR SC system controller detected according to moment send urea flow instruction corresponding to the warm operating mode of high row, and this moment, the temperature of catalyst converter does not also have enough time to reach the temperature when stablizing, and the aqueous solution of urea that sprays into can generate ammonia salt and cover catalyst surface under the warm environment of low row.Along with the progressively rising of catalyst temperature, the ammonia of the inner absorption of catalyzer can be overflowed in a large number, and ammonia salt pyrolytic reaction also occurs discharges ammonia, and this moment, the amount of ammonia tended to exceed the theory demands amount, discharges with ammonia in the catalyst converter outlet, pollutes.Otherwise when motor was transitioned into the warm operating mode of low row from the warm operating mode of height row moment, the NOx discharging will exceed standard, and pollutes equally.
Therefore, need particularly a kind of in the situation that the temperature of the instantaneous conditions Accurate Prediction SCR catalyst converter of motor, thereby obtain in time the conversion ratio of SCR catalyst converter, in order to correctly calculate device, system and method to the urea injecting quantity of SCR catalyst converter.
Summary of the invention
The object of the invention is to the problems referred to above of present SCR control system are improved, namely pass through the temperature of prediction SCR catalyst converter, thus the conversion ratio of the SCR catalyst converter of prediction under engine steady state and instantaneous conditions.Like this when engine operating condition changes, can accurately predict the temperature of SCR catalyst converter and obtain the NOx conversion ratio of SCR catalyst converter, the conversion ratio in the situation of instantaneous conditions particularly, thus under the various operating modes of calculation engine accurately to the urea injecting quantity of SCR catalyst converter.
according to an aspect of the present invention, a kind of SCR control gear is provided, comprise: the temperature prediction device, the temperature that is used for prediction SCR catalyst converter, the conversion ratio obtaining device, be used for according to the predicted temperature of SCR catalyst converter and rotating speed and the moment of torsion of motor, obtain the conversion ratio of SCR catalyst converter, and emitted dose computing device, be used for according to the NOx discharge amount of motor and the conversion ratio of SCR catalyst converter, calculating is to the urea injecting quantity of SCR catalyst converter, wherein said temperature prediction device comprises: a plurality of infinitesimals of SCR catalyst converter, be used for the true temperature according to the SCR catalyst converter, physical parameter and engine exhaust flow, calculate the device of the temperature of a plurality of infinitesimals, and for the temperature according to a plurality of infinitesimals that calculate, calculate the device of the temperature of SCR catalyst converter.
SCR control gear according to an embodiment of the invention, wherein the SCR catalyst converter comprises 2-10 infinitesimal.
SCR control gear according to an embodiment of the invention, wherein the SCR catalyst converter comprises 5-6 infinitesimal.
SCR control gear according to an embodiment of the invention, wherein the annexation between a plurality of infinitesimals in the SCR catalyst converter is be connected in series or be connected in parallel or the connection of series parallel connection combination.
SCR control gear according to an embodiment of the invention, wherein a plurality of infinitesimals in the SCR catalyst converter have configurations differing from one and/or size.
SCR control gear according to an embodiment of the invention, wherein be used for the temperature according to a plurality of infinitesimals that calculate, calculate the arithmetic mean value of the temperature of device by calculating each infinitesimal of temperature of SCR catalyst converter or the temperature that weighted mean value calculates the SCR catalyst converter.
according to another aspect of the present invention, a kind of SCR control system is provided, comprise: the SCR catalyst converter, detection device, true temperature for detection of the SCR catalyst converter, the SCR control gear, and urea-spray device, be used for according to the urea injecting quantity to the SCR catalyst converter by described SCR control gear calculating, adjusting is to the urea-spray of SCR catalyst converter, wherein said SCR control gear comprises: the temperature prediction device, the temperature that is used for prediction SCR catalyst converter, the conversion ratio obtaining device, be used for according to the predicted temperature of SCR catalyst converter and rotating speed and the moment of torsion of motor, obtain the conversion ratio of SCR catalyst converter, and emitted dose computing device, be used for according to the NOx discharge amount of motor and the conversion ratio of SCR catalyst converter, calculating is to the urea injecting quantity of SCR catalyst converter, wherein said temperature prediction device comprises: a plurality of infinitesimals of SCR catalyst converter, be used for the true temperature according to the SCR catalyst converter, physical parameter and engine exhaust flow, calculate the device of the temperature of a plurality of infinitesimals, and for the temperature according to a plurality of infinitesimals that calculate, calculate the device of the temperature of SCR catalyst converter.
SCR control system according to an embodiment of the invention, wherein the SCR catalyst converter comprises 2-10 infinitesimal.
SCR control system according to an embodiment of the invention, wherein the SCR catalyst converter comprises 5-6 infinitesimal.
SCR control system according to an embodiment of the invention, wherein the annexation between a plurality of infinitesimals in the SCR catalyst converter is be connected in series or be connected in parallel or the connection of series parallel connection combination.
SCR control system according to an embodiment of the invention, wherein a plurality of infinitesimals in the SCR catalyst converter have configurations differing from one and/or size.
SCR control system according to an embodiment of the invention, wherein be used for the temperature according to a plurality of infinitesimals that calculate, calculate the arithmetic mean value of the temperature of device by calculating each infinitesimal of temperature of SCR catalyst converter or the temperature that weighted mean value calculates the SCR catalyst converter.
according to another aspect of the present invention, a kind of SCR controlling method is provided, comprise: the temperature of prediction SCR catalyst converter, according to the predicted temperature of SCR catalyst converter and rotating speed and the moment of torsion of motor, obtain the conversion ratio of SCR catalyst converter, and according to the NOx discharge amount of motor and the conversion ratio of SCR catalyst converter, calculating is to the urea injecting quantity of SCR catalyst converter, the step of wherein predicting the temperature of SCR catalyst converter comprises: the SCR catalyst converter is divided into a plurality of infinitesimals, and according to the true temperature of SCR catalyst converter, physical parameter and engine exhaust flow, calculate the temperature of a plurality of infinitesimals, and according to the temperature of a plurality of infinitesimals that calculate, calculate the temperature of SCR catalyst converter.
SCR controlling method according to an embodiment of the invention wherein is divided into 2-10 infinitesimal with described SCR catalyst converter.
SCR controlling method according to an embodiment of the invention wherein is divided into 5-6 infinitesimal with described SCR catalyst converter.
SCR controlling method according to an embodiment of the invention, wherein a plurality of infinitesimals in the SCR catalyst converter are to be connected in series or to be connected in parallel or the mode of series parallel connection combination interconnects.
SCR controlling method according to an embodiment of the invention wherein is divided into a plurality of infinitesimals in described SCR catalyst converter and has configurations differing from one and/or size.
SCR controlling method according to an embodiment of the invention, wherein according to the temperature of a plurality of infinitesimals that calculate, the step of calculating the temperature of SCR catalyst converter comprises the temperature according to a plurality of infinitesimals that calculate, the arithmetic mean value of the temperature by calculating each infinitesimal or the temperature that weighted mean value calculates the SCR catalyst converter.
Description of drawings
Embodiments of the invention are described as example with reference to accompanying drawing, wherein:
Fig. 1 is the skeleton diagram according to SCR control system of the present invention, comprising SCR control gear according to the present invention and temperature prediction device.
Fig. 2 is according to SCR controlling method flow chart of the present invention.
Fig. 3 is according to SCR catalyst temperature Forecasting Methodology flow chart of the present invention.
Embodiment
Fig. 1 is the skeleton diagram according to SCR control system of the present invention.The SCR control system comprises SCR catalyst converter 1; Detection device 2 is for detection of the true temperature of SCR catalyst converter 1; SCR control gear 3 is used for the urea injecting quantity to SCR catalyst converter 1 that calculates; And urea-spray device 4, be used for regulating the urea-spray to SCR catalyst converter 1 according to the urea injecting quantity to SCR catalyst converter 1 by 3 calculating of SCR control gear.
Referring to Fig. 1, SCR control gear 3 comprises temperature prediction device 31, is used for the temperature of prediction SCR catalyst converter; Conversion ratio obtaining device 32 is used for according to the predicted temperature of SCR catalyst converter and rotating speed and the moment of torsion of motor, obtains the conversion ratio of SCR catalyst converter; And emitted dose computing device 33, be used for according to the NOx discharge amount of motor and the conversion ratio of SCR catalyst converter, calculate the urea injecting quantity to the SCR catalyst converter.
As shown in Figure 1, temperature prediction device 31 comprises a plurality of infinitesimals of SCR catalyst converter; Be used for true temperature, physical parameter and engine exhaust flow according to the SCR catalyst converter, calculate the device of the temperature of a plurality of infinitesimals; And for the temperature according to a plurality of infinitesimals that calculate, calculate the device of the temperature of SCR catalyst converter.
According to an embodiment, temperature prediction device 31 can comprise 2-10 infinitesimal of SCR catalyst converter, namely the SCR catalyst converter can be divided into 2-10 infinitesimal.Generally speaking, the infinitesimal number of SCR catalyst converter is more, and is just higher to the order of accuarcy of its temperature prediction.By experiment as can be known, in the situation that 2 infinitesimals, corresponding temperature variation is slower, is difficult to estimate accurately the quick variation of temperature; In the situation that 10 infinitesimals have embodied preferably the transient process of temperature, but can produce larger computation delay, thereby reduced the precision of calculating.Therefore, need to according to shape and the structure of SCR catalyst converter, reasonably select the infinitesimal quantity of SCR catalyst converter.Be preferably 5-6 according to the number of the infinitesimal of experimental result SCR catalyst converter.
According to an embodiment, in the infinitesimal quantity of determining the SCR catalyst converter, also should the essentially identical zone of working state in the SCR catalyst converter be divided into an infinitesimal according to shape and the structure of SCR catalyst converter, namely select the dividing mode of infinitesimal.A plurality of infinitesimals can be connected in series, and namely the output of first infinitesimal is as the input of second infinitesimal.But for example for the SCR catalyst converter of tubular, a plurality of infinitesimals can be also connections parallel with one another.According to the needs of shape and the structure of SCR catalyst converter, a plurality of infinitesimals even can interconnect in the mode of series parallel connection combination.This need to according to the concrete condition of SCR catalyst converter, be determined by experiment.
According to an embodiment, in the infinitesimal quantity and dividing mode of determining the SCR catalyst converter, also need to consider the shape and size of a plurality of SCR catalyst converter infinitesimals.Impact due to factors such as the shape of SCR catalyst converter and structures, make it when work, the essentially identical regional extent of working state may be different, therefore the SCR catalyst converter need to be divided into a plurality of infinitesimals that vary in size, and namely a plurality of infinitesimals can have configurations differing from one and/or size.This need to according to the concrete condition of SCR catalyst converter, be determined equally by experiment.
According to an embodiment, in the temperature prediction device 31 as shown in Figure 1, comprised the temperature that is used for according to a plurality of infinitesimals that calculate, the arithmetic mean value of the temperature by calculating simply each infinitesimal calculates the device of the temperature of SCR catalyst converter.
But, be not difficult to find out according to above description, from the temperature of a plurality of infinitesimals, the predicted temperature that obtains the SCR catalyst converter should be considered quantity, annexation and shape thereof and/or the size of a plurality of infinitesimals.Can be according to shape and the structure of SCR catalyst converter, shape and/or size and the position in the SCR catalyst converter thereof according to a plurality of infinitesimals, and correspondingly distribute different separately weights for a plurality of infinitesimals on the basis of experiment, temperature to each infinitesimal is weighted on average, to obtain the predicted temperature of SCR catalyst converter.Therefore, according to another embodiment, in the temperature prediction device 31 as shown in Figure 1, comprised the temperature that is used for according to a plurality of infinitesimals that calculate, the weighted mean value of the temperature by calculating each infinitesimal calculates the device of the temperature of SCR catalyst converter.
According to an embodiment, can according to true temperature, physical parameter and the engine exhaust flow of SCR catalyst converter, calculate the temperature of a plurality of infinitesimals.Formula is as follows:
dT out dt = a 7 m EG * ( T in - T out ) - a 9 ( T out 4 - T amb 4 )
Wherein:
a 7 = n Cell c p , EG c p , C m C
a 9 = ϵ Rad , SCR σ SB A Rad , SCR c p , C m C
m * EG: exhaust mass flow (kg/s);
T amb: ambient temperature (k);
T in: infinitesimal inlet temperature (k);
T out: infinitesimal outlet temperature (k);
n Cell: catalyst converter infinitesimal number;
Wherein following parameter is the physical parameter of SCR catalyst converter, comprising:
ε Rad, SCR=0.507: blackness;
σ SB=5.67e-8: gas radiation constant (W/m 2K 4);
c P, C=1016: catalyst converter specific heat (J/kgK);
m C=30: catalyst converter quality (kg);
c P, EG=1050: exhaust specific heat at constant pressure (J/kgK);
A Rad, SCR=0.9044: catalyst converter radiation surface area (m 2);
For example work as n Cell=2 o'clock, a 7=0.0689 a 9=8.530e-13.
Below with reference to Fig. 2 and Fig. 3.Wherein Fig. 2 is according to SCR controlling method flow chart of the present invention, and Fig. 3 is according to SCR catalyst temperature Forecasting Methodology flow chart of the present invention.
As shown in Figure 2, in step 100, the temperature of prediction SCR catalyst converter; In step 110, according to the predicted temperature of SCR catalyst converter and rotating speed and the moment of torsion of motor, obtain the conversion ratio of SCR catalyst converter; In step 120, according to the NOx discharge amount of motor and the conversion ratio of SCR catalyst converter, calculate the urea injecting quantity to the SCR catalyst converter.
As shown in Figure 3, the step of the temperature of prediction SCR catalyst converter comprises following step.In step 200, the SCR catalyst converter is divided into a plurality of infinitesimals; In step 210, according to true temperature, physical parameter and the engine exhaust flow of SCR catalyst converter, calculate the temperature of a plurality of infinitesimals; And in step 220, according to the temperature of a plurality of infinitesimals that calculate, calculate the temperature of SCR catalyst converter.
According to an embodiment, in the SCR controlling method, the SCR catalyst converter can be divided into 2-10 infinitesimal.The number of the infinitesimal of SCR catalyst converter preferably can be divided into 5-6 according to experimental result.
According to an embodiment, in the infinitesimal quantity of determining the SCR catalyst converter, also should the essentially identical zone of working state in the SCR catalyst converter be divided into an infinitesimal according to shape and the structure of SCR catalyst converter, namely select the dividing mode of infinitesimal.A plurality of infinitesimals can be connected in series, and namely the output of first infinitesimal is as the input of second infinitesimal.But for example for the SCR catalyst converter of tubular, a plurality of infinitesimals can be also connections parallel with one another.According to the needs of shape and the structure of SCR catalyst converter, a plurality of infinitesimals even can interconnect in the mode of series parallel connection combination.This need to according to the concrete condition of SCR catalyst converter, be determined by experiment.
According to an embodiment, in the infinitesimal quantity and dividing mode of determining the SCR catalyst converter, also need to consider the shape and size of a plurality of SCR catalyst converter infinitesimals.Impact due to factors such as the shape of SCR catalyst converter and structures, make it when work, the essentially identical regional extent of working state may be different, therefore the SCR catalyst converter need to be divided into a plurality of infinitesimals that vary in size, and namely a plurality of infinitesimals can have configurations differing from one and/or size.This need to according to the concrete condition of SCR catalyst converter, be determined equally by experiment.
According to an embodiment, in the SCR controlling method, comprise the temperature according to a plurality of infinitesimals that calculate, the arithmetic mean value of the temperature by calculating simply each infinitesimal calculates the temperature of SCR catalyst converter.
According to another embodiment, in the SCR controlling method, comprise the temperature according to a plurality of infinitesimals that calculate, the weighted mean value of the temperature by calculating each infinitesimal calculates the temperature of SCR catalyst converter.
Be appreciated that, the step 100-120 that puts down in writing in above-mentioned SCR controlling method corresponds respectively to above operation and/or the function of temperature prediction device 31, conversion ratio obtaining device 32 and emitted dose computing device 33 in the SCR control gear 3 of describing with reference to figure 1, and wherein step 200-220 corresponds respectively to above specific operation and/or the function of the temperature prediction device 31 of describing with reference to figure 1.Thus, the feature of above describing with reference to each device of SCR control gear 3 is equally applicable to each step of SCR controlling method.And each step of putting down in writing in the SCR controlling method can be carried out and/or executed in parallel according to different orders.
In addition, should be appreciated that referring to figs. 2 and 3 the SCR controlling method of describing and to realize by computer program.For example, this computer program can comprise at least one computer-readable recording medium, and it has the computer readable program code part that is stored thereon.When for example processor was carried out, it was used for carrying out the step of SCR controlling method when computer-readable code part.
Therefore, should be appreciated that and to modify, to change and to make up each mode of execution of the present invention in the situation that do not break away from true spirit of the present invention.Description in this specification is only used for illustrative, and should not be considered to restrictive.Scope of the present invention only is subjected to the restriction of appended claims.

Claims (18)

1. SCR control gear is characterized in that comprising:
The temperature prediction device, for the temperature of prediction SCR catalyst converter,
The conversion ratio obtaining device is used for according to the predicted temperature of SCR catalyst converter and rotating speed and the moment of torsion of motor, obtains the conversion ratio of SCR catalyst converter, and
The emitted dose computing device is used for according to the NOx discharge amount of motor and the conversion ratio of SCR catalyst converter, calculates the urea injecting quantity that sprays to the SCR catalyst converter,
Wherein said temperature prediction device comprises:
A plurality of infinitesimals of SCR catalyst converter,
Be used for true temperature, physical parameter and engine exhaust flow according to the SCR catalyst converter, calculate the device of the temperature of a plurality of infinitesimals, and
Be used for the temperature according to a plurality of infinitesimals that calculate, calculate the device of the temperature of SCR catalyst converter.
2. SCR control gear according to claim 1, is characterized in that described SCR catalyst converter comprises 2-10 infinitesimal.
3. SCR control gear according to claim 2, is characterized in that described SCR catalyst converter comprises 5-6 infinitesimal.
4. the described SCR control gear of any one according to claim 1-3 is characterized in that annexation between a plurality of infinitesimals in described SCR catalyst converter is be connected in series or be connected in parallel or the connection of series parallel connection combination.
5. the described SCR control gear of any one according to claim 1-3, is characterized in that a plurality of infinitesimals in described SCR catalyst converter have configurations differing from one and/or size.
6. the described SCR control gear of any one according to claim 1-3, it is characterized in that describedly for the temperature according to a plurality of infinitesimals that calculate, calculate the arithmetic mean value of the temperature of device by calculating each infinitesimal of temperature of SCR catalyst converter or the temperature that weighted mean value calculates the SCR catalyst converter.
7. SCR control system is characterized in that comprising:
The SCR catalyst converter,
Detection device, for detection of the true temperature of SCR catalyst converter,
The SCR control gear, and
The urea-spray device is used for regulating the urea-spray to the SCR catalyst converter according to the urea injecting quantity to the SCR catalyst converter by described SCR control gear calculating,
Wherein said SCR control gear comprises:
The temperature prediction device, for the temperature of prediction SCR catalyst converter,
The conversion ratio obtaining device is used for according to the predicted temperature of SCR catalyst converter and rotating speed and the moment of torsion of motor, obtains the conversion ratio of SCR catalyst converter, and
The emitted dose computing device is used for according to the NOx discharge amount of motor and the conversion ratio of SCR catalyst converter, calculates the urea injecting quantity that sprays to the SCR catalyst converter,
Wherein said temperature prediction device comprises:
A plurality of infinitesimals of SCR catalyst converter,
Be used for true temperature, physical parameter and engine exhaust flow according to the SCR catalyst converter, calculate the device of the temperature of a plurality of infinitesimals, and
Be used for the temperature according to a plurality of infinitesimals that calculate, calculate the device of the temperature of SCR catalyst converter.
8. SCR control system according to claim 7, is characterized in that described SCR catalyst converter comprises 2-10 infinitesimal.
9. SCR control system according to claim 8, is characterized in that described SCR catalyst converter comprises 5-6 infinitesimal.
10. the described SCR control system of any one according to claim 7-9 is characterized in that annexation between a plurality of infinitesimals in described SCR catalyst converter is be connected in series or be connected in parallel or the connection of series parallel connection combination.
11. the described SCR control system of any one according to claim 7-9 is characterized in that a plurality of infinitesimals in described SCR catalyst converter have configurations differing from one and/or size.
12. the described SCR control system of any one according to claim 7-9, it is characterized in that describedly for the temperature according to a plurality of infinitesimals that calculate, calculate the arithmetic mean value of the temperature of device by calculating each infinitesimal of temperature of SCR catalyst converter or the temperature that weighted mean value calculates the SCR catalyst converter.
13. a SCR controlling method is characterized in that comprising:
The temperature of prediction SCR catalyst converter,
According to the predicted temperature of SCR catalyst converter and rotating speed and the moment of torsion of motor, obtain the conversion ratio of SCR catalyst converter, and
According to the NOx discharge amount of motor and the conversion ratio of SCR catalyst converter, calculate the urea injecting quantity that sprays to the SCR catalyst converter,
The step of wherein predicting the temperature of SCR catalyst converter comprises:
The SCR catalyst converter is divided into a plurality of infinitesimals, and
According to true temperature, physical parameter and the engine exhaust flow of SCR catalyst converter, calculate the temperature of a plurality of infinitesimals, and
According to the temperature of a plurality of infinitesimals that calculate, calculate the temperature of SCR catalyst converter.
14. SCR controlling method according to claim 13 is characterized in that described SCR catalyst converter is divided into 2-10 infinitesimal.
15. SCR controlling method according to claim 14 is characterized in that described SCR catalyst converter is divided into 5-6 infinitesimal.
16. the described SCR controlling method of any one according to claim 13-15 is characterized in that a plurality of infinitesimals in described SCR catalyst converter are to be connected in series or to be connected in parallel or the mode of series parallel connection combination interconnects.
17. the described SCR controlling method of any one according to claim 13-15 is characterized in that a plurality of infinitesimals in described SCR catalyst converter are divided into and has configurations differing from one and/or size.
18. the described SCR controlling method of any one according to claim 13-15, the temperature that it is characterized in that described a plurality of infinitesimals according to calculating, the step of calculating the temperature of SCR catalyst converter comprises the temperature according to a plurality of infinitesimals that calculate, the arithmetic mean value of the temperature by calculating each infinitesimal or the temperature that weighted mean value calculates the SCR catalyst converter.
CN2011101462964A 2011-05-20 2011-05-20 SCR (Semiconductor Control Rectifier) control device, system and method Active CN102230414B (en)

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