CN101761424B - Grey decision-making theory-based method for controlling metering hole electromagnetic valve of EGR valve - Google Patents

Abstract

The invention provides a grey decision-making theory-based method for controlling a metering hole electromagnetic valve of an EGR valve, belonging to the technical field of exhaust system control of an internal combustion engine. The method comprises the following steps: regularly and continuously sampling and initializing the rotating speed n(0)(k) of the internal combustion engine, the cooling water temperature t(0)(k) of a throttle internal combustion engine, air inlet temperature T(0)(k) of the internal combustion engine and the air-fuel ratio lambda(0)(k) of the internal combustion engine, wherein the k is sampling time; and acquiring the initialized rotating speed n'(0)(k) of the internal combustion engine, the cooling water temperature t'(0)(k) of a throttle internal combustion engine, the air inlet temperature T'(0)(k) of the internal combustion engine and the air-fuel ratio lambda'(0)(k) of the internal combustion engine, wherein the k is the sampling time. By using the grey decision-making theory with high dynamic real-time performance, the method acquires impact factors impacting the opening and closing of the metering hole electromagnetic valve of the EGR valve, and realizes optimal control of opening and closing the metering hole electromagnetic valve of the EGR valve on the basis of not increasing modification cost.

Description

Controlling method based on the measuring hole solenoid valve of the EGR valve of grey decision-making theory

Technical field

Controlling method based on the measuring hole solenoid valve of the EGR valve of grey decision-making theory belongs to internal combustion engine exhaust system control technique field.Be specifically related to the controlling method of the measuring hole solenoid valve of gas recirculation system EGR valve.

Background technique

The oxynitrides NO of one of harmful gas in the I. C. engine exhaust _xBe discharged in the atmosphere, run into strongly when ultraviolet, can generate photochemical smog.This photochemical smog can cause ocular pain, and serious also can cause expiratory dyspnea.The long-term nitrogen oxide NO that breathes _xWith the air that black smoke etc. pollutes, bring the disease and the cancer of respiratory apparatus easily, have a strong impact on human health.

Chemically, nitrogen is so-called inert gas, has been not easy oxidation, but temperature height to a degree still can form nitrogen oxide.Therefore if will reduce the amount of nitrogen oxides in the engine exhaust, just must manage to reduce the FT of engine.The method of vehicle use at present is exactly in suction tude, to import some waste gas that burnt, and mixes with fresh air, makes it to burn once more; Its effect is the oxygen concentration that reduces mixed gas, absorbs the heat that burning discharges, and makes that velocity of combustion slows down, FT reduces, and has just reduced NO _xGeneration quantity, though Modern Internal-Combustion Engine be gasoline or diesel oil the EGR gas recirculation system all arranged, and the air inflow of all coming control and management waste gas with computer obtains maximum interests and balance to be desirably on environmental protection and the power.

Through retrieval and investigation, at present with the most use is low pressure egr system, and the primary component of its system is a digital control type EGR valve.Digital control type EGR valve is installed on the right gas exhaust manifold, and effect is independently the exhausted air quantity that is recycled to motor to be controlled accurately, and no matter the size of mainfold vacuum degree.The measuring hole that the EGR valve increases progressively through three apertures is controlled the exhausted air quantity that flows back to intake manifold from gas exhaust manifold, to produce the combination of 7 kinds of different flows.Each measuring hole all is made up of a solenoid valve and needle-valve, and when solenoid valve was switched on, armature was just inhaled to the top by magnet, and measuring hole is opened.The characteristic of rotary needle-valve has guaranteed when the EGR valve cuts out, to have excellent sealing property.The EGR valve is opened under following condition usually: 1. engine warm-up running; 2. rotating speed surpasses idling.

Consider that most producer is not very high for the consciousness of environmental protection; Consider the more still problem of manufacture cost; Therefore mostly control roughly about the controlling method of the measuring hole solenoid valve of EGR valve based on engine coolant temperature sensor, TPS and air flow sensor; Cause engine misses easily, do not have to consider more to influence the factor of operating mode, and all kinds of influence factor all participates in calculating and tabling look-up; Ignore the effect of major influence factors easily, the control accuracy of the measuring hole solenoid valve of EGR valve and speed of response also have the space that promotes.

Summary of the invention

The technical problem that the present invention will solve is: to the some shortcomings of the controlling method of the measuring hole solenoid valve of present gas recirculation system EGR valve; Make full use of the formation characteristics of hyundai electronics automobile, a kind of controlling method of measuring hole solenoid valve of the EGR valve based on grey decision-making theory is provided.

The technical solution adopted for the present invention to solve the technical problems is: this 1, based on the controlling method of the measuring hole solenoid valve of the EGR valve of grey decision-making theory, it is characterized in that: step is following:

1.1 fixed cycle continuous sampling internal-combustion engine rotational speed n ⁽⁰⁾(k), throttle opening

Cooling water of internal combustion engine temperature t ⁽⁰⁾(k), air-intake of combustion engine temperature T ⁽⁰⁾(k), air fuel ratio λ ⁽⁰⁾(k), k is sampling instant;

1.2 internal-combustion engine rotational speed n is handled in value just ⁽⁰⁾(k), throttle opening

Cooling water of internal combustion engine temperature t ⁽⁰⁾(k), air-intake of combustion engine temperature T ⁽⁰⁾(k), air fuel ratio λ ⁽⁰⁾(k) correlated sampling data, the internal-combustion engine rotational speed n ' of value at the beginning of obtaining ⁽⁰⁾(k), throttle opening

Cooling water of internal combustion engine temperature t ' ⁽⁰⁾(k), the air-intake of combustion engine temperature T ' ⁽⁰⁾(k), air fuel ratio λ ' ⁽⁰⁾(k), k is sampling instant;

1.3 internal-combustion engine rotational speed n ' to first value ⁽⁰⁾(k), throttle opening

Cooling water of internal combustion engine temperature t ' ⁽⁰⁾(k), the air-intake of combustion engine temperature T ' ⁽⁰⁾(k), air fuel ratio λ ' ⁽⁰⁾(k), carry out the analysis of grey auto correlation, and select the degree of association each other to be maximum influence factor, for later stage gray decision is prepared according to the result; The concrete steps that auto correlation is analyzed are following:

Find the solution the internal-combustion engine rotational speed n ' of value just ⁽⁰⁾(k), throttle opening Cooling water of internal combustion engine temperature t ' ⁽⁰⁾(k), the air-intake of combustion engine temperature T ' ⁽⁰⁾(k), air fuel ratio λ ' ⁽⁰⁾(k) each factor sequence absolute difference Δ in twos _Ij(k), representation is: Wherein, w _i(k), w _j(k) the internal-combustion engine rotational speed n ' of representative value just respectively ⁽⁰⁾(k), throttle opening

Cooling water of internal combustion engine temperature t ' ⁽⁰⁾(k), the air-intake of combustion engine temperature T ' ⁽⁰⁾(k), air fuel ratio λ ' ⁽⁰⁾(k) each factor sequence;

According to representation τ (w _i(k),

Obtain the grey correlation coefficient τ (w of each factor sequence _i(k), w _j(k));

Obtain the grey degree of association of each factor sequence according to representation

; Wherein: r is the grey degree of association.

1.4 structure decision-making situation s _k=(a, b _i), wherein a is the incident of the measuring hole solenoid valve of switch EGR valve, b _iBe the countermeasure of realization event a, through target p _jQuantize, j is a target sequence number, j=1, and 2 ..., M, M≤5, i is the sequence number of EGR valve measuring hole solenoid valve;

1.5 construction target p _jCorrespondence quantize target, i.e. the measuring hole solenoid valve factor of influence q of switch EGR valve _j, q wherein _jRepresent internal-combustion engine rotational speed n successively by the arrangement of subscript ascending order ⁽⁰⁾(k), throttle opening

Cooling water of internal combustion engine temperature t ⁽⁰⁾(k), air-intake of combustion engine temperature T ⁽⁰⁾(k), air fuel ratio λ ⁽⁰⁾(k) meet in that the degree of association meets the requirements of factor in the step 1.3, j=1,2 ..., M, M≤5;

1.6 according to the construction target, the countermeasure b of fixed cycle continuous sampling incident _iUnder the correspondence target q that quantizes _j, and adopt upper limit measure of merit to unify the countermeasure b of each incident _iUnder the measuring hole solenoid valve factor of influence q of switch EGR valve _j ⁽ⁱ⁾Sequence polarity, obtain the sequence q ' after the unified polarity _j ⁽ⁱ⁾, and according to formula

Find the solution each incident countermeasure b _iUnder General estimate

1.7 according to formula

$z_{i^{*}}=\underset{i}{\max }\left\{z_i^{\left(\mathrm{\Σ}\right)}\right\},$ $z_{i^{\′}}=\underset{{i\≠i}^{*}}{\max }\left\{z_i^{\left(\mathrm{\Σ}\right)}\right\},$ $z_{i^{\′\′}}=\underset{{i\≠i}^{\′},{i\≠i}^{*}}{\max }\left\{z_i^{\left(\mathrm{\Σ}\right)}\right\}$

Obtain maximum and estimate unit, inferiorly estimate unit and the 3rd greatly and estimate unit, subscript i ^*, i ', i " the corresponding incident countermeasure b of difference _iSwitching manipulation, that is the measuring hole solenoid valve of switch EGR valve, if

Then open the i of EGR valve ^*The i ' measuring hole the solenoid valve of measuring hole solenoid valve and EGR valve, if

Then the measuring hole solenoid valve of EGR valve is all opened, if above-mentioned condition does not all satisfy, then opens the i of EGR valve ^*The measuring hole solenoid valve; Wherein ε is a default absolute difference threshold value;

2, the controlling method of the measuring hole solenoid valve of the EGR valve based on grey decision-making theory according to claim 1 is characterized in that: internal-combustion engine rotational speed n is handled in the first value described in the step 1.2 ⁽⁰⁾(k), throttle opening

Cooling water of internal combustion engine temperature t ⁽⁰⁾(k), air-intake of combustion engine temperature T ⁽⁰⁾(k), air fuel ratio λ ⁽⁰⁾(k) sampled data, its just value method be that to make the leading coefficient of each sequence be 1.

Compared with prior art; The beneficial effect that controlling method had of measuring hole solenoid valve that the present invention is based on the EGR valve of grey decision-making theory is: considered more relevantly with actual conditions and influence that engine system is moved and the various factors of the measuring hole solenoid valve of switch EGR valve, utilized the existing various sensor signals of hyundai electronics automobile, used to have low volume data; The grey decision-making theory that dynamic real-time is high; Obtain the factor of influence of the measuring hole solenoid valve that influences switch EGR valve, on the basis that does not increase the repacking cost, realized the optimal control of the measuring hole solenoid valve of switch EGR valve; The control accuracy and the speed of response of the solenoid valve of the measuring hole of EGR valve obviously promote; Avoid meaningless fuel consume, importantly greatly reduced the discharge amount of nitrogen oxide, protected environment.

Description of drawings

Fig. 1 is the controlling method FB(flow block) of measuring hole solenoid valve that the present invention is based on the EGR valve of grey decision-making theory;

Fig. 2 is the nitrogen oxide emission design sketch of controlling method of measuring hole solenoid valve that the present invention is based on the EGR valve of grey decision-making theory.

Fig. 1-2 is the most preferred embodiment of controlling method of measuring hole solenoid valve that the present invention is based on the EGR valve of grey decision-making theory.

Embodiment

Below in conjunction with accompanying drawing 1-2 the controlling method of the measuring hole solenoid valve of the EGR valve that the present invention is based on grey decision-making theory is done further explain:

Be illustrated in figure 1 as the controlling method FB(flow block) of the measuring hole solenoid valve of the EGR valve that the present invention is based on grey decision-making theory, concrete steps are following:

Step 1 fixed cycle continuous sampling internal-combustion engine rotational speed n ⁽⁰⁾(k), throttle opening Cooling water of internal combustion engine temperature t ⁽⁰⁾(k), air-intake of combustion engine temperature T ⁽⁰⁾(k), air fuel ratio λ ⁽⁰⁾(k); K is sampling instant; Fixed cycle is 0～200ms; Number of samples is no less than four data units, and each sequential sampling value embodies formula and is:

n ⁽⁰⁾(k)＝{n ⁽⁰⁾(1)n ⁽⁰⁾(2)…n ⁽⁰⁾(M)}

t ⁽⁰⁾(k)＝{t ⁽⁰⁾(1)t ⁽⁰⁾(2)…t ⁽⁰⁾(M)}

T ⁽⁰⁾(k)＝{T ⁽⁰⁾(1)T ⁽⁰⁾(2)…T ⁽⁰⁾(M)}

λ ⁽⁰⁾(k)＝{λ ⁽⁰⁾(1)λ ⁽⁰⁾(2)…λ ⁽⁰⁾(M)}

Wherein, M is a unit period sampling sum, and M >=4.

Internal-combustion engine rotational speed n is handled in step 2 value just ⁽⁰⁾(k), throttle opening

Cooling water of internal combustion engine temperature t ⁽⁰⁾(k), air-intake of combustion engine temperature T ⁽⁰⁾(k), air fuel ratio λ ⁽⁰⁾Sampled data such as (k) obtains the internal-combustion engine rotational speed n ' of value just ⁽⁰⁾(k), throttle opening

Cooling water of internal combustion engine temperature t ' ⁽⁰⁾(k), the air-intake of combustion engine temperature T ' ⁽⁰⁾(k), air fuel ratio λ ' ⁽⁰⁾(k); K is sampling instant; The formula that embodies of each first value sequence is:

n′ ⁽⁰⁾(k)＝{1n ⁽⁰⁾(2)/n ⁽⁰⁾(1)…n ⁽⁰⁾(M)/n ⁽⁰⁾(1)}

t′ ⁽⁰⁾(k)＝{1t ⁽⁰⁾(2)/t ⁽⁰⁾(1)…t ⁽⁰⁾(M)/t ⁽⁰⁾1)}

T′ ⁽⁰⁾(k)＝{1T ⁽⁰⁾(2)/T ⁽⁰⁾(1)…T ⁽⁰⁾(M)/T ⁽⁰⁾(1)}

λ′ ⁽⁰⁾(k)＝{1λ ⁽⁰⁾(2)/λ ⁽⁰⁾(1)…λ ⁽⁰⁾(M)/λ ⁽⁰⁾(1)}

Step 3 is to the internal-combustion engine rotational speed n ' of first value ⁽⁰⁾(k), throttle opening

Cooling water of internal combustion engine temperature t ' ⁽⁰⁾(k), the air-intake of combustion engine temperature T ' ⁽⁰⁾(k), air fuel ratio λ ' ⁽⁰⁾(k) carry out the analysis of grey auto correlation, the concrete steps that auto correlation is analyzed are following:

1) finds the solution the internal-combustion engine rotational speed n ' of value just ⁽⁰⁾(k), throttle opening

Cooling water of internal combustion engine temperature t ' ⁽⁰⁾(k), the air-intake of combustion engine temperature T ' ⁽⁰⁾(k), air fuel ratio λ ' ⁽⁰⁾(k) each factor sequence absolute difference Δ in twos _Ij(k), representation is:

Wherein, w _i(k), w _j(k), represent the internal-combustion engine rotational speed n ' of value just respectively by subscript inequality ascending order principle ⁽⁰⁾(k), throttle opening

Cooling water of internal combustion engine temperature t ' ⁽⁰⁾(k), the air-intake of combustion engine temperature T ' ⁽⁰⁾(k), air fuel ratio λ ' ⁽⁰⁾(k) each factor sequence.

2) according to representation

Obtain the grey correlation coefficient τ (w of each factor sequence _i(k), w _j(k)).

3) obtain the grey degree of association of each factor sequence according to representation

.

The result who analyzes according to the grey auto correlation at last selects the degree of association each other to be maximum influence factor, for later stage gray decision is prepared.

Step 4 structure decision-making situation s _k=(a, b _i), wherein a is the incident of the measuring hole solenoid valve of switch EGR valve, b _iBe the countermeasure of realization event a, through target p _jQuantize, j is a target sequence number, j=1, and 2 ..., M, M≤5, i is the sequence number of the measuring hole solenoid valve of EGR valve.

Step 5 construction target p _jThe correspondence target that quantizes, the measuring hole solenoid valve factor of influence q of switch EGR valve _j, q wherein _jRepresent internal-combustion engine rotational speed n successively by the arrangement of subscript ascending order ⁽⁰⁾(k), throttle opening

Cooling water of internal combustion engine temperature t ⁽⁰⁾(k), air-intake of combustion engine temperature T ⁽⁰⁾(k), air fuel ratio λ ⁽⁰⁾(k) meet in that the degree of association meets the requirements of factor in the step 3, j=1,2 ..., M, M≤5.

Step 6 is according to the construction target, the countermeasure b of fixed cycle continuous sampling incident _iUnder each desired value, and adopt upper limit measure of merit to unify the countermeasure b of each incident _iUnder the measuring hole solenoid valve factor of influence q of switch EGR valve _j ⁽ⁱ⁾Sequence polarity, obtain the sequence q ' after the unified polarity _j ⁽ⁱ⁾, the formula that embodies of the upper limit measure of merit of employing is:

$q_j^{\′\left(i\right)}=\frac{q_j^{\left(i\right)}}{\underset{k}{\max }\left(q_j^{\left(i\right)}\right)}$

Then, according to formula

Find the solution the countermeasure b of each incident _iUnder General estimate

Step 7 is according to formula

$z_{i^{*}}=\underset{i}{\max }\left\{z_i^{\left(\mathrm{\Σ}\right)}\right\},$ $z_{i^{\′}}=\underset{{i\≠i}^{*}}{\max }\left\{z_i^{\left(\mathrm{\Σ}\right)}\right\},$ $z_{i^{\′\′}}=\underset{{i\≠i}^{\′},{i\≠i}^{*}}{\max }\left\{z_i^{\left(\mathrm{\Σ}\right)}\right\}$

Obtain maximum and estimate unit, inferiorly estimate unit and the 3rd greatly and estimate unit, subscript i ^*, i ', i " the corresponding incident countermeasure b of difference _iSwitching manipulation, that is the measuring hole solenoid valve of switch EGR valve, if

Then open the i of EGR valve ^*The i ' measuring hole the solenoid valve of measuring hole solenoid valve and EGR valve, if

Then the measuring hole solenoid valve of EGR valve is all opened, if above-mentioned condition does not all satisfy, then opens the i of EGR valve ^*The measuring hole solenoid valve; Wherein ε is a default absolute difference threshold value, generally is taken as 0.01.

Embodiment:

Embodiment of the invention Object Selection be that Nanfeng Electromechanical Equipment Manufacturing Co., Ltd., Luoyang make to produce supporting engine test stand; This equipment can pass through electric eddy current dynamometer, accurately simulates various driving cycles, need to prove in order to realize the comparison of the data that the present invention and test-bed record; Sensing equipment to each influence factor among the embodiment; Carried out small change, adopted the double-sensor pattern, through RS232 and A/D interface; Connect another microprocessor, default absolute difference threshold value is 0.01.

Carry out the detailed elaboration of controlling method of the measuring hole solenoid valve of the EGR valve based on grey decision-making theory of the present invention below in conjunction with the nitrogen oxide emission of a certain driving cycle that the present invention is directed to embodiment's object simulation:

The first step, unit period continuous sampling data number is 6, preceding 5 data of sampling are as the internal-combustion engine rotational speed n that obtains ⁽⁰⁾(k), throttle opening

Cooling water of internal combustion engine temperature t ⁽⁰⁾(k), air-intake of combustion engine temperature T ⁽⁰⁾(k), air fuel ratio λ ⁽⁰⁾(k) original series data are as shown in table 1, and the unit of temperature is degree centigrade, and the unit of throttle opening is an angle, and the unit of rotating speed is rev/min, back 1 data of sampling as the grey auto correlation analysis confirm after the major influence factors p according to target _jThe countermeasure b that obtains _iUnder sample sequence.

Table 1

In second step, after first value is handled, obtain the internal-combustion engine rotational speed n ' of value just ⁽⁰⁾(k), throttle opening

Cooling water of internal combustion engine temperature t ' ⁽⁰⁾(k), the air-intake of combustion engine temperature T ' ⁽⁰⁾(k), air fuel ratio λ ' ⁽⁰⁾(k) sequence data is as shown in table 2:

Table 2

The 3rd goes on foot, and finds the solution the internal-combustion engine rotational speed n ' of value just ⁽⁰⁾(k), throttle opening

Cooling water of internal combustion engine temperature t ' ⁽⁰⁾(k), the air-intake of combustion engine temperature T ' ⁽⁰⁾(k), air fuel ratio λ ' ⁽⁰⁾(k) each factor sequence absolute difference Δ in twos _Ij(k), according to formula

It is as shown in table 3 to calculate the gained result, wherein w _i(k), w _j(k), represent the internal-combustion engine rotational speed n ' of value just respectively by subscript inequality ascending order principle ⁽⁰⁾(k), throttle opening

Cooling water of internal combustion engine temperature t ' ⁽⁰⁾(k), the air-intake of combustion engine temperature T ' ⁽⁰⁾(k), air fuel ratio λ ' ⁽⁰⁾(k) each factor sequence.

Table 3

Following representation is obviously arranged:

Δ ₁₂(k)＝Δ ₂₁(k)，Δ ₁₃(k)＝Δ ₃₁(k)，Δ ₁₄(k)＝Δ ₄₁(k)，Δ ₁₅(k)＝Δ ₅₁(k)，Δ ₂₃(k)＝Δ ₃₂(k)

Δ ₂₄(k)＝Δ ₄₂(k)，Δ ₂₅(k)＝Δ ₅₂(k)，Δ ₃₄(k)＝Δ ₄₃(k)，Δ ₃₅(k)＝Δ ₅₃(k)，Δ ₄₅(k)＝Δ ₅₄(k).

Δ ₁₁(k)＝Δ ₂₂(k)＝Δ ₃₃(k)＝Δ ₄₄(k)＝Δ ₅₅(k)＝0

The 4th step is according to representation

Obtain the grey correlation coefficient τ (w of each factor sequence _i(k), w _j(k)), it is as shown in table 4 to calculate the gained result, and wherein resolution ratio ρ is taken as 0.5, w _i(k), w _j(k), represent the internal-combustion engine rotational speed n ' of value just respectively by subscript inequality ascending order principle ⁽⁰⁾(k), throttle opening Cooling water of internal combustion engine temperature t ' ⁽⁰⁾(k), the air-intake of combustion engine temperature T ' ⁽⁰⁾(k), air fuel ratio λ ' ⁽⁰⁾(k) each factor sequence.

Table 4

The 5th step is according to representation

The grey degree of association calculating gained result who obtains each factor sequence is as shown in table 5, wherein w _i(k), w _j(k), represent the internal-combustion engine rotational speed n ' of value just respectively by subscript inequality ascending order principle ⁽⁰⁾(k), throttle opening

Cooling water of internal combustion engine temperature t ' ⁽⁰⁾(k), the air-intake of combustion engine temperature T ' ⁽⁰⁾(k), air fuel ratio λ ' ⁽⁰⁾(k) each factor sequence.

Table 5

Result by table 5 grey correlation analysis can find out, carves at this moment under the operating mode, the grey degree of association r of the rotating speed of internal-combustion engine and engine air control shutter aperture (n ' ⁽⁰⁾(k),

) greater than the grey degree of association of itself and other influence factor; The grey degree of association r of the intake temperature of engine air control shutter aperture and internal-combustion engine (

T ' ⁽⁰⁾(k)) greater than the grey degree of association of itself and other influence factor; The grey degree of association r of the intake temperature of internal-combustion engine and the cooling water temperature of internal-combustion engine (t ' ⁽⁰⁾(k), T ' ⁽⁰⁾(k)) greater than the grey degree of association of itself and other influence factor; Thereby the major influence factors under this moment operating mode of confirming is respectively internal-combustion engine rotational speed n ⁽⁰⁾(k), throttle opening

Cooling water of internal combustion engine temperature t ⁽⁰⁾(k), air-intake of combustion engine temperature T ⁽⁰⁾(k).

The 6th step is according to the construction target, according to incident countermeasure b _iUnder each desired value obtain back 1 sampled value, as shown in table 6:

Table 6

Adopt upper limit measure of merit to unify the countermeasure b of each incident _iUnder the measuring hole solenoid valve factor of influence q of switch EGR valve _j ⁽ⁱ⁾Sequence polarity, obtain the sequence q ' after the unified polarity _j ⁽ⁱ⁾(k), as shown in table 7, the formula that embodies of the upper limit measure of merit of employing is:

Q wherein _j ⁽ⁱ⁾Expression countermeasure b _iUnder, according to target p _jThe internal-combustion engine rotational speed n ' that obtains ⁽⁰⁾(k), throttle opening

Cooling water of internal combustion engine temperature t ' ⁽⁰⁾(k), the air-intake of combustion engine temperature T ' ⁽⁰⁾(k).

Table 7

The numbering form of i is fixing in table 6 and the table 7, and the present invention is temporarily according to the top-down serial number in measuring hole solenoid valve mounting point of EGR valve, countermeasure b _iThe countermeasure of the incident of the measuring hole solenoid valve of expression switch EGR valve.

Data in the associative list 7 are according to formula

Each the incident countermeasure b that obtains _iUnder General estimate

For: $z_1^{\left(\mathrm{\Σ}\right)}=0.9637,$ $z_2^{\left(\mathrm{\Σ}\right)}=0.9391,$ $z_3^{\left(\mathrm{\Σ}\right)}=0.9654.$

The 7th step is according to formula

$z_{i^{*}}=\underset{i}{\max }\left\{z_i^{\left(\mathrm{\Σ}\right)}\right\},$ $z_{i^{\′}}=\underset{{i\≠i}^{*}}{\max }\left\{z_i^{\left(\mathrm{\Σ}\right)}\right\},$ $z_{i^{\′\′}}=\underset{{i\≠i}^{\′},{i\≠i}^{*}}{\max }\left\{z_i^{\left(\mathrm{\Σ}\right)}\right\}$

Obtain maximum and estimate unit, inferiorly estimate unit and the 3rd greatly and estimate unit, subscript i ^*, i ', i " the corresponding incident countermeasure b of difference _iSwitching manipulation, that is the measuring hole solenoid valve of switch EGR valve, if Then open the i of EGR valve ^*The i ' measuring hole the solenoid valve of measuring hole solenoid valve and EGR valve, if

Then the measuring hole solenoid valve of EGR valve is all opened, if above-mentioned condition does not all satisfy, then opens the i of EGR valve ^*The measuring hole solenoid valve; In conjunction with the result that the 6th step provided, can confirm that the 1st, No. 3 measuring hole solenoid valve of EGR valve opened under this moment operating mode.

Be illustrated in figure 2 as the nitrogen oxide emission design sketch of controlling method of the measuring hole solenoid valve of the EGR valve that the present invention is based on grey decision-making theory; Compare and guarantee the precision of exhaust gas oxygen sensor for ease; The present invention adopts independent repeated test, and the vehicle driving mileage of simulation is 150km, the sampling period of nitrogen oxide emission be 1～50min. as can be seen from the figure; Adopt the nitrogen oxide emission of egr system to be starkly lower than the nitrogen oxide emission that does not adopt egr system; And adopt the switch of the measuring hole solenoid valve of method control EGR valve of the present invention, greatly reduce the discharge amount of nitrogen oxide, than on average low 5～10 percentage points of low pressure EGR systems.

The above only is preferred embodiment of the present invention, is not to be the restriction of the present invention being made other form, and any professional and technical personnel of being familiar with possibly utilize the technology contents of above-mentioned announcement to change or be modified as the equivalent embodiment of equivalent variations.In every case be not break away from technological scheme content of the present invention, to any simple modification, equivalent variations and remodeling that above embodiment did, still belong to the protection domain of technological scheme of the present invention according to technical spirit of the present invention.

Claims (2)

1. based on the controlling method of the measuring hole solenoid valve of the EGR valve of grey decision-making theory, it is characterized in that: step is following:

1.1 fixed cycle continuous sampling internal-combustion engine rotational speed n ⁽⁰⁾(k), throttle opening

Cooling water of internal combustion engine temperature t ⁽⁰⁾(k), air-intake of combustion engine temperature T ⁽⁰⁾(k), air fuel ratio λ ⁽⁰⁾(k), k is sampling instant;

1.2 internal-combustion engine rotational speed n is handled in value just ⁽⁰⁾(k), throttle opening

Cooling water of internal combustion engine temperature t ⁽⁰⁾(k), air-intake of combustion engine temperature T ⁽⁰⁾(k), air fuel ratio λ ⁽⁰⁾(k) correlated sampling data, the internal-combustion engine rotational speed n ' of value at the beginning of obtaining ⁽⁰⁾(k), throttle opening

Cooling water of internal combustion engine temperature t ' ⁽⁰⁾(k), the air-intake of combustion engine temperature T ' ⁽⁰⁾(k), air fuel ratio λ ' ⁽⁰⁾(k), k is sampling instant;

1.3 internal-combustion engine rotational speed n ' to first value ⁽⁰⁾(k), throttle opening

Cooling water of internal combustion engine temperature t ' ⁽⁰⁾(k), the air-intake of combustion engine temperature T ' ⁽⁰⁾(k), air fuel ratio λ ' ⁽⁰⁾(k), carry out the analysis of grey auto correlation, and select the degree of association each other to be maximum influence factor, for later stage gray decision is prepared according to the result; The concrete steps that auto correlation is analyzed are following:

Find the solution the internal-combustion engine rotational speed n ' of value just ⁽⁰⁾(k), throttle opening

Cooling water of internal combustion engine temperature t ' ⁽⁰⁾(k), the air-intake of combustion engine temperature T ' ⁽⁰⁾(k), air fuel ratio λ ' ⁽⁰⁾(k) each factor sequence absolute difference Δ in twos _Ij(k), representation is:

Wherein, w _i(k), w _j(k) the internal-combustion engine rotational speed n ' of representative value just respectively ⁽⁰⁾(k), throttle opening

Cooling water of internal combustion engine temperature t ' ⁽⁰⁾(k), the air-intake of combustion engine temperature T ' ⁽⁰⁾(k), air fuel ratio λ ' ⁽⁰⁾(k) each factor sequence;

According to representation

Obtain the grey correlation coefficient τ (w of each factor sequence _i(k), w _j(k));

Obtain the grey degree of association of each factor sequence according to representation

; Wherein: r is the grey degree of association.

1.4 structure decision-making situation s _k=(a, b _i), wherein a is the incident of the measuring hole solenoid valve of switch EGR valve, b _iBe the countermeasure of realization event a, through target p _jQuantize, j is a target sequence number, j=1, and 2 ..., M, M≤5, i is the sequence number of EGR valve measuring hole solenoid valve;

1.5 construction target p _jCorrespondence quantize target, i.e. the measuring hole solenoid valve factor of influence q of switch EGR valve _j, q wherein _jRepresent internal-combustion engine rotational speed n successively by the arrangement of subscript ascending order ⁽⁰⁾(k), throttle opening

Cooling water of internal combustion engine temperature t ⁽⁰⁾(k), air-intake of combustion engine temperature T ⁽⁰⁾(k), air fuel ratio λ ⁽⁰⁾(k) meet in that the degree of association meets the requirements of factor in the step 1.3, j=1,2 ..., M, M≤5;

1.6 according to the construction target, the countermeasure b of fixed cycle continuous sampling incident _iUnder the correspondence target q that quantizes _j, and adopt upper limit measure of merit to unify the countermeasure b of each incident _iUnder the measuring hole solenoid valve factor of influence q of switch EGR valve _j ⁽ⁱ⁾Sequence polarity, obtain the sequence q ' after the unified polarity _j ⁽ⁱ⁾, and according to formula

Find the solution each incident countermeasure b _iUnder General estimate

1.7 according to formula

$z_{i^{*}}=\underset{i}{\max }\left\{z_i^{\left(\mathrm{\Σ}\right)}\right\},$ $z_{i^{\′}}=\underset{{i\≠i}^{*}}{\max }\left\{z_i^{\left(\mathrm{\Σ}\right)}\right\},$ $z_{i^{\′\′}}=\underset{{i\≠i}^{\′},{i\≠i}^{*}}{\max }\left\{z_i^{\left(\mathrm{\Σ}\right)}\right\}$

Obtain maximum and estimate unit, inferiorly estimate unit and the 3rd greatly and estimate unit, subscript i ^*, i ', i " and the switching manipulation of corresponding incident countermeasure bi, that is the measuring hole solenoid valve of switch EGR valve respectively, if

Then open the i of EGR valve ^*The i ' measuring hole the solenoid valve of measuring hole solenoid valve and EGR valve, if

Then the measuring hole solenoid valve of EGR valve is all opened, if above-mentioned condition does not all satisfy, then opens the i of EGR valve ^*The measuring hole solenoid valve; Wherein ε is a default absolute difference threshold value;

2. the controlling method of the measuring hole solenoid valve of the EGR valve based on grey decision-making theory according to claim 1 is characterized in that: internal-combustion engine rotational speed n is handled in the first value described in the step 1.2 ⁽⁰⁾(k), throttle opening

Cooling water of internal combustion engine temperature t ⁽⁰⁾(k), air-intake of combustion engine temperature T ⁽⁰⁾(k), air fuel ratio λ ⁽⁰⁾(k) sampled data, its first value method is for making internal-combustion engine rotational speed n ⁽⁰⁾(k), throttle opening

Cooling water of internal combustion engine temperature t ⁽⁰⁾(k), air-intake of combustion engine temperature T ⁽⁰⁾(k), air fuel ratio λ ⁽⁰⁾(k) leading coefficient of each sequence is 1.

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