CN102297032B - Equipment and method for controlling air system of diesel engine - Google Patents

Abstract

The embodiment of the invention relates to equipment and a method for controlling an air system of a diesel engine. Specifically according to the embodiment, the characteristic of the diesel engine is represented by a transfer function, and the characteristic function is calibrated on the basis of working condition data of the diesel engine in a working area. In the control process, a decoupling transfer function is calculated according to the transfer function and the steady state working condition parameters of the diesel engine. When the decoupling transfer function acts on the processed state parameters of the air system, driving signals used for an exhaust gas recirculation (EGR) system and a turbo charging system can be independently generated, so that decoupling of the two systems is realized. The embodiment of the invention discloses the corresponding equipment, the diesel engine and the method.

Description

The equipment and the method that are used for the air system of control diesel engine

Technical field

Embodiments of the present invention relate generally to diesel engine, more specifically, relate to equipment and method for the air system of controlling diesel engine.

Background technique

Along with the development of motor theory and technology, EGR (EGR) system has become the important component part in diesel engine.In the waste gas that diesel engine is discharged, usually contain a large amount of oxynitrides (NOx), it is a main source that causes pollution of atmosphere.Utilize egr system, a part of waste gas that diesel engine produces is sent back to cylinder.Because EGR gas has inertia, so it will the retarded combustion process, velocity of combustion is slowed down to some extent, and then cause the pressure initiation process in the firing chamber to slow down, thereby effectively reduce oxynitrides.In addition, improve ER EGR Rate total exhaust gas flow is reduced, so in toxic emission, total pollutant output quantity will be reduced.

Except EGR, for the power performance, the improvement burning that improve diesel engine, turbo charge system is also one of important component part in modern diesel engines.For example, variable geometry turbocharger (VGT) is a kind of common turbo charge system.Turbo charge system is a kind of air compression system in essence, increases the air inflow of diesel engine cylinder by pressurized air.It is driven by the impulse force of the waste gas that motor is discharged, and by devices such as pressurized machine rotating shafts, pressure is passed to air compressor, thus make the air that newly enters before entering cylinder by supercharging effectively.

Be equipped with at the same time in the diesel engine of EGR and turbo charge system, the coupled characteristic between these two has proposed challenge to the control of air system.In the diesel engine that is equipped with gas recirculation system EGR and turbo charge system, for egr system, control accurately that EGR leads and intake temperature is improve the NOx discharging and reduce it to the key of particulate matter and power and economic influence.In this motor, the flow of the input waste gas of cooler for recycled exhaust gas is controlled by the EGR valve, and the turbine inlet end of the entry end of EGR valve and turbosupercharger both all receives the engine exhaust of discharging from exhaust duct.Be appreciated that the boost pressure that pressurization system causes and the variation of exhaust back pressure also can exert an influence to the EGR flow rate except the aperture variation of EGR valve self.On the other hand, the aperture of EGR valve changes also and can the inlet flow rate of input pressurized machine be exerted an influence.That is to say, gas recirculation system and pressurization system be two interdepend, interactional system, that is, have coupled characteristic.

The coupled characteristic that gas recirculation system and pressurization system have is the difficult point that diesel engine air system controls all the time, and the multivariable Control strategy of controlling simultaneously both is also the study hotspot of diesel engine air system control strategy always.In the prior art, several known control strategy simplified summary are as follows:

(1) the independent control strategy of gas recirculation system and pressurization system namely take boost pressure as controlling target, adds transient state Feed-forward Control Strategy driving pressure charging valve by PID (proportional-integral-differential) control and makes actual supercharge pressure reach desired value; Take air mass flow as controlling target, control by PID the control strategy driving EGR valve that adds the transient state feedforward and make actual air flow reach desired value.

(2) take Induction air flow and boost pressure as controlling target, according to the air system mean value model is carried out local linearization, according to linear model devise optimum or robust controller, thereby further expand to again the method that whole condition range obtains non-linear control strategy: control as infinite in H, controller design method according to the Lyapunov Theory of Stability, the control law of minimum quadratic form optimum state feedback, sliding mode controller etc.

(3) take Induction air flow and boost pressure as controlling target, according to the controller design method of non-analytical model: as the fuzzy logic control method, according to the controlling method of neuron network etc.

(4) take Induction air flow and boost pressure as controlling target, adopt model predictive control method, the i.e. mathematical model of integrated controlled device in controller, by model, following multi-step system output is predicted, according to the deviation of predicted value and desired value structure objective function, the optimum value by the current controlled quentity controlled variable of iterative makes the minimization of object function.

(5) take sky so than and suction tude in the exhaust mass mark as the control target, adopt air system contraction decoupling control policy, the transfer function matrix that is air system is contraction in some cases, therefore, control target for two and have certain relation, original two-dimentional control strategy can be converted into better simply one dimension control strategy.

The major advantage of above-mentioned independent PID control strategy (1) according to air mass flow and boost pressure is simple in structure and can realizes that good stable state controls effect, and it is little to be used for the experiment work amount of demarcation of parameter.The shortcoming that closed loop PID controls is that the coupled characteristic due to system itself makes the control effect of its dynamic process undesirable, the phenomenon of smoldering easily occurs in the process of acceleration.Another shortcoming of the closed loop control that works alone is that the EGR operating range is limited, when reason is that the EGR valve can only pressure be higher than boost pressure before the whirlpool, therefore can only be used for middle-low load and middle and slow speed of revolution operating mode.Nissan, Toyota, the companies such as Cummins do not adopt air mass flow and boost pressure as desired value in actual use, replace boost pressure as the control strategy of desired value and adopted to lead with EGR.

The problem of a general character of this several method is that the flow of EGR is estimated.Because the EGR flow transducer all far can not satisfy actual use needs on precision or reliability, make the EGR flow mainly obtain by estimation.And affecting Tail Pipe Temperature and the pressure of EGR flow, EGR pipeline restriction coefficient, cooling effectiveness etc. all need a large amount of tests just can obtain satisfied estimation effect, therefore make very huge according to the control system test of the method.Although above control strategy can be obtained effect preferably in stable state is controlled, but because gas recirculation system and pressurization system act on suction tude simultaneously, there is coupled characteristic, and do not have for this coupled characteristic design transient control strategy in control strategy, so transient control effect is often unsatisfactory.

Exist the accuracy of air system control strategy to require as control strategy (2)-(4) of controlling target and obvious contradiction of terseness requirement formation take Induction air flow and boost pressure.This contradiction is directed to strong coupling and the non-linear correlation of gas recirculation system and pressurization system.All can't satisfy the requirement of stable state and mapping according to closed loop control strategy and its distortion of air mass flow and boost pressure.Various theoretical research result are due to the complexity of control strategy, to the requirement of control hardware, and many-sided factors such as difficulty of parameter calibration, also be not suitable with the requirement of actual control system.

And for adopt empty so than and suction tude in the exhaust mass mark as the control strategy (5) of control target, in actual use, lack the ripe commercial sensor of directly measuring exhaust mass mark in air fuel ratio and suction tude, so can not realize directly take this parameter as controlling the feedback control of target.Therefore and air mass flow and boost pressure all are very easy to by existing sensor measurement, can set up the feedback control strategy according to air mass flow and boost pressure, empty right than with suction tude in the exhaust mass mark obtain by visualizer as intermediate variable.And state observer will be introduced time delay and error, and it is disadvantageous that instantaneous conditions is controlled.

In sum, the control strategy for diesel engine air system in prior art can't satisfy diesel engine actual motion stable state and instantaneous conditions performance well simultaneously, and the requirement of demarcating of discharging and diesel engine control unit (ECU).

Therefore, in the art, need a kind ofly can to satisfy the actual operating mode of diesel engine, relatively simple and be easy to the air system control strategy realizing and demarcate.

Summary of the invention

In order to overcome the defects that exists in prior art, embodiments of the present invention provide a kind of equipment and method of more effectively controlling the air system of diesel engine under stable state.

In one aspect of the invention, provide a kind of for control the equipment of the air system of diesel engine under stable state, wherein said air system comprises gas recirculation system and turbo charge system, described equipment comprises: the operating mode obtaining device, and configuration is used for obtaining the parameter of the actual conditions of indicating described diesel engine; The decoupling zero computing device, it is coupled to described operating mode obtaining device, configuration is used for according to coming the computation decoupling transfer function from the described parameter of described operating mode obtaining device and the transfer function that characterizes described diesel engine, and wherein said transfer function is the floor data in its stable operation zone and demarcating based on described diesel engine; The air system parameter processing apparatus, it is coupled to described operating mode obtaining device, and configuration is for the treatment of the parameter of the state of the described air system of indication; And signal generation device, it is coupled to described decoupling zero computing device and described air system parameter processing apparatus, configuration is used for according to from the described decoupling zero transfer function of described decoupling zero computing device with from the processing result of described air system parameter processing apparatus, produces to be used for first of described gas recirculation system and to drive signal and be used for second of described turbo charge system and drive signal.

According to a further aspect in the invention, provide a kind of diesel engine, comprising: cylinder block; Admission line is coupled to the entry end of described cylinder block, and configuration is used for carrying gas to described cylinder block; Exhaust duct is coupled to the outlet end of described cylinder block, and configuration is used for discharging the waste gas of described cylinder block burning; Fuel injection system is coupled to described cylinder block, and configuration is used for to described cylinder block injected fuel; Air system; And control unit.According to the embodiment of the present invention, air system comprises: gas recirculation system, be coupled to described exhaust duct and described admission line, and configuration is used for and will be transmitted back to described cylinder block by described admission line from the part waste gas of described exhaust duct; And turbo charge system, being coupled to described exhaust duct, configuration is used for being used to waste gas from described exhaust duct and increases suction pressure by described cylinder block.Described control unit comprises equipment as indicated above, to be used for controlling described air system under stable state.

According to another aspect of the invention, provide a kind of for control the method for the air system of diesel engine under stable state, wherein said air system comprises gas recirculation system and turbo charge system, and described method comprises: the parameter of obtaining the actual conditions of the described diesel engine of indication; Come the computation decoupling transfer function according to described parameter and the transfer function that characterizes described diesel engine, wherein said transfer function is demarcated at the floor data in its stable operation zone according to described diesel engine; Process the parameter of the state of the described air system of indication; And according to the result of described decoupling zero transfer function and described processing, produce and be used for first of described gas recirculation system and drive signal and be used for second of described turbo charge system and drive signal.

According to the embodiment of the present invention, provide a kind of equipment and method that the air system of diesel engine is control effectively.In embodiments of the present invention, utilize transfer function to characterize the feature of diesel engine.In control procedure, according to the calculation of parameter decoupling zero transfer function of this transfer function and indication working condition of diesel engine, thereby guarantee to produce independently of one another for the driving signal of EGR valve with for the driving signal of pressure charging valve, realize both decoupling zero with this.Particularly, by this decoupling zero transfer function being acted on treated air system status parameter (for example, EGR flow rate and the suction pressure of motor), can realize these two decoupling zeros that drive signal, this will be explained below.

Especially, it will be understood by those skilled in the art that diesel engine is not can both stably work under all status parameters of air system.For example, diesel engine only can stably be worked under some combination of EGR valve and pressure charging valve usually.According to the embodiment of the present invention, will determine can to make the combination of EGR valve opening and the pressure charging valve aperture of diesel engine stable operation under given rotating speed and load, that is, and the stable operation of diesel engine zone.Like this, the transfer function of motor and be used for thus decoupling zero transfer function that air system controls and can utilize the data in this stable operation zone data of place (for example, as mentioned below stable operation equinoctial point) to demarcate.In this way, embodiments of the present invention have guaranteed the control independently of each other under steady state condition of exhaust gas recirculation valve and turbosupercharging valve, and can demarcate respectively.Thus, both reached these two tersenesses that system demarcates, significantly improved the functional characteristic of air control system for air.

Description of drawings

Read hereinafter detailed description by the reference accompanying drawing, above-mentioned and other purposes of embodiment of the present invention, the feature and advantage easy to understand that will become.In the accompanying drawings, show some mode of executions of the present invention in exemplary and nonrestrictive mode, wherein:

Fig. 1 shows the schematic diagram that comprises gas recirculation system and turbo charge system diesel engine both;

Fig. 2 shows the schematic diagram according to the control apparatus 200 of the air system that is used for diesel engine of embodiment of the present invention;

Fig. 3 shows the schematic diagram according to the steady-working state of the diesel engine of embodiment of the present invention;

The decoupling zero transfer function of utilizing that Fig. 4 shows according to embodiment of the present invention produces the schematic diagram that two classes drive signal independently of one another;

Fig. 5 shows the schematic diagram of the SOC(system on a chip) (SoC) 500 of the control apparatus 200 that is suitable for putting into practice in Fig. 2; And

Fig. 6 shows the flow chart according to the controlling method 600 of the air system that is used for diesel engine of embodiment of the present invention.

In the accompanying drawings, identical or corresponding label represents identical or corresponding part.

Embodiment

Below with reference to some illustrative embodiments, principle of the present invention and spirit are described.Should be appreciated that providing these mode of executions is only in order to make those skilled in the art can understand better and then realize the present invention, and be not to limit the scope of the invention by any way.

A kind of equipment and method of the air system for controlling diesel engine have been proposed according to the embodiment of the present invention.Should be noted that in this article, the term that uses " air system " comprises EGR egr system and turbo charge system at least.

It shall yet further be noted that mention in this article such as the concrete turbo charge system such as variable geometry turbine system (VGT), be only for explanation and demonstration purpose.Embodiments of the present invention are equally applicable to utilize engine exhaust to carry out any turbo charge system of the present known of work or exploitation in future.Scope of the present invention is unrestricted in this regard.

In addition, in this article, the term that uses " parameter " expression is any can indicate the value of the physical quantity of (target or the reality) physical state of motor or operation conditions.And in this article, " parameter " physical quantity represented with it can Alternate.For example, " parameter of indication rotating speed " has with " rotating speed " implication that is equal in this article.

In addition, in this article, the term that uses " obtains " and comprises known or various means that develop in the future at present, and for example measure, read, estimate, estimate, etc.

Below with reference to some representative embodiments of the present invention, explain in detail principle of the present invention and spirit.At first with reference to figure 1, as indicated above, it shows the schematic diagram of the diesel engine 100 that is equipped with EGR and turbo charge system.Should be appreciated that and only show part relevant with embodiments of the present invention in diesel engine 100 in Fig. 1.Diesel engine 100 can also comprise the miscellaneous part of arbitrary number.

As shown in Figure 1, diesel engine 100 comprises: cylinder block 108; Admission line 106 is coupled to the entry end of cylinder block 108, and configuration is used for carrying gases to cylinder block 108; Exhaust duct 112 is coupled to the outlet end of cylinder block 108, and configuration is used for discharging the waste gas of cylinder block 108 burnings; Fuel injection system 110 is coupled to cylinder block 108, and configuration is used for to its injected fuel; Air system; And control unit (ECU) 114, be used for realization to the control of diesel engine 100.As mentioned above, air system comprises: gas recirculation system (for example comprising EGR valve 116, cooler for recycled exhaust gas 118 and other necessary parts), it is coupled to exhaust duct 112 and admission line 106, and configuration is used for and will be transmitted back to cylinder block 108 by admission line 106 from the part waste gas of exhaust duct 112; And turbo charge system (for example comprising pressurized machine 120, pressurized machine rotating shaft 124, air compressor 102, air intercooler 104 and other necessary parts), it is coupled to exhaust duct 112, for the waste gas that is used to from exhaust duct 112, increase the suction pressure by cylinder block 108.

As can see from Figure 1, gas recirculation system and turbo charge system all receive the waste gas from exhaust duct 112, and its charge flow rate is controlled by EGR valve 116 and pressure charging valve 122 respectively.In operation, diesel engine electronic control unit (ECU) 114 produces corresponding valve drive signal according to the operating mode of motor, is respectively used to control the aperture of EGR valve 116 and pressure charging valve 122.As mentioned above, the performance of gas recirculation system and turbo charge system affects each other, therefore need to effectively control the aperture of exhaust gas recirculation valve 116 and pressure charging valve 122.

With reference to figure 2, it shows the schematic diagram according to the control apparatus 200 of the air system that is used for diesel engine of embodiment of the present invention.Be appreciated that control apparatus 200 can be used as the diesel engine ECU 114 shown in Fig. 1 or its part and tries out.Alternatively, control apparatus 200 also can be implemented as specially the control apparatus for the air system of diesel engine.

As shown in Figure 2, control apparatus 200 comprises operating mode obtaining device 202, the parameter of its configurable actual conditions be used to obtaining indication diesel engine (for example, diesel engine 100 shown in Figure 1).In some embodiments of the present invention, operating mode obtaining device 202 can comprise rotating speed obtaining device 2022, and the parameter of its configurable actual speed be used to obtaining the indication motor is designated as ω.Operating mode obtaining device 202 can also comprise fuel injection rate obtaining device 2024, and the parameter of its configurable actual fuel injection rate be used to obtaining the indication motor is designated as

In addition, according to the embodiment of the present invention, operating mode obtaining device 202 also comprises EGR flow rate obtaining device 2026 and suction pressure obtaining device 2028, will be described in more detail below.

Be to be understood that, operating mode obtaining device 202 (and comprising sub-device 2022-2028) can obtain by actual measurement the duty parameter of motor, operating mode obtaining device 202 also can obtain according to physical condition the duty parameter of motor by estimation or estimation, etc.Scope of the present invention is unrestricted in this regard.And, it is also understood that device 2022-2028 is only the example that can be included in the device in operating mode obtaining device 202.In fact, operating mode obtaining device 202 can comprise any one or a plurality of other obtaining device, is used for obtaining other duty parameters of diesel engine.This is that those skilled in the art easily expect, scope of the present invention is unrestricted equally in this regard.

As described in Figure 2, according to the embodiment of the present invention, control apparatus 200 also comprises decoupling zero computing device 204, and it is coupled to operating mode obtaining device 202, configuration be used for according to from the parameter of operating mode obtaining device 202 (such as, engine speed ω and engine fuel injection rate

), and come the computation decoupling transfer function according to the transfer function that characterizes engine features.In connection with following concrete example, describe feature and the operation of decoupling zero computing device 204 in detail now.

Those skilled in the art will appreciate that motor can utilize transfer function (transfer function) to characterize in the feature of particular aspects.Transfer function can be multinomial, the arteries and veins spectral data of engine condition variable, etc.Especially, as indicated above, one of main purpose of embodiment of the present invention is: control the EGR valve of gas recirculation system and the pressure charging valve aperture separately of turbo charge system.The aperture of EGR valve and pressure charging valve then the EGR flow rate that affects diesel engine (are designated as

) and suction pressure (be designated as P _im), these two has represented the state of air system.Thus, in embodiments of the present invention, transfer function (being designated as W) can be designed to characterize the aperture of EGR valve and pressure charging valve to the EGR flow rate of diesel engine

And suction pressure (P _im) impact.

The transfer function that those skilled in the art will appreciate that diesel engine can utilize the duty parameter of motor to demarcate.Yet diesel engine is not can both stably work under all status parameters of air system.In fact, diesel engine only can stably be worked under some combination of EGR valve and pressure charging valve usually.Utilize the duty parameter of motor under unstable state to demarcate transfer function, may cause transfer function can't accurately reflect the characteristic of motor, and then make the decoupling zero transfer function that derives based on transfer function effectively to carry out decoupling zero to the control of egr system and pressurization system.

Therefore, in embodiments of the present invention, in order to demarcate more exactly transfer function, at first the stable operation zone of diesel engine will be determined.Term " stable operation zone " expression can make diesel engine be in the scope of the air system status parameter of steady-working state as used herein.Especially, In some embodiments of the present invention, the stable operation zone can be illustrated under given rotating speed and load, can make the EGR valve opening of diesel engine stable operation and the scope of pressure charging valve aperture.

For example, referring to Fig. 3, it shows diesel engine and (that is, sends engine speed ω, fuel injection rate in various operating modes EGR valve opening EGR _POSAnd pressure charging valve aperture VGT _POS) under stable operation zone (as shown in the bold outline line).As shown in the figure, in figure, the abscissa of system of coordinates is the aperture (EGR of EGR valve _POS), y coordinate is the aperture (VGT of pressure charging valve _POS).In the scope in stable operation shown in Figure 3 zone, diesel engine can stably be worked.According to the embodiment of the present invention, this stable operation zone can knowledge-based, existing standard, product descritption, the various means such as diesel engine test and/or emulation are determined.Other modes of determining the stable operation zone of motor are also feasible, and scope of the present invention is unrestricted in this regard.

According to the embodiment of the present invention, the characteristic function of diesel engine can be demarcated at the floor data in its stable operation zone based on motor.Especially, according to some mode of execution of the present invention, the floor data in the stable operation zone can be diesel engine at the floor data at its steady state condition equinoctial point place.When being in this, the Physics parameter of diesel engine all is in stable state of equilibrium when the status parameter (for example, the aperture of EGR valve and the aperture of pressure charging valve) of air system in term " steady state condition equinoctial point " expression as used herein.For example, with cylinder suction pressure (P _im) and the EGR flow rate

In situation for the independent variable of transfer function, at steady working condition equinoctial point place, the suction pressure of diesel engine and EGR flow rate all are in stable state of equilibrium.

An illustrative embodiments of the steady state condition equinoctial point that is used for definite diesel engine is described now.Still with reference to figure 3, in the stable operation zone of diesel engine, can build waiting the air inlet pressure line of force and waiting the recirculated exhaust gas flow line of this diesel engine.Be appreciated that in the stable operation zone, for each given rotating speed and load, can determine to make the cylinder intake pressure of motor to keep constant EGR valve opening and a plurality of pairings (pair) of pressure charging valve aperture.Each in these pairings is corresponding to a point on system of coordinates.Based on these points, can or approach by curve to create a curve.Each some place on this curve, it is constant that the cylinder intake pressure of motor keeps.Thus, this curve is called as " waiting the air inlet pressure line of force ".For a plurality of given operating mode of motor, can construct a plurality of such line of forces such as air inlet pressure such as grade.Similarly, can construct equally the line such as recirculated exhaust gas flow such as grade of motor.

As described in Figure 3, in the stable operation zone of diesel engine, wait the air inlet pressure line of force and etc. have a series of intersection points between the amount of exhaust gas recirculation line.At these intersection points place, cylinder intake pressure and the amount of exhaust gas recirculation of diesel engine all are in steady state.Thus, the corresponding pressure charging valve aperture of these intersection points and EGR valve opening can be confirmed as the steady state condition equinoctial point of diesel engine.

How now discussion utilizes diesel engine at the floor data at its steady working condition equinoctial point place, demarcates the transfer function that characterizes this diesel engine characteristic.According to the embodiment of the present invention, the recirculated exhaust gas flow rate of each the steady operation state of diesel engine in the stable operation zone

With cylinder suction pressure P _imCan be represented by following formula (1) and (2) respectively:

${\stackrel{\·}{m}}_{\mathrm{egr}}=F_{\mathrm{egr}}(\mathrm{\ω},{\stackrel{\·}{m}}_f,{\mathrm{EGR}}_{\mathrm{pos}},{\mathrm{VGT}}_{\mathrm{pos}})---\left(1\right)$

$P_{\mathrm{im}}=F_p(\mathrm{\ω},{\stackrel{\·}{m}}_f,{\mathrm{EGR}}_{\mathrm{pos}},{\mathrm{VGT}}_{\mathrm{pos}})---\left(2\right)$

Each steady state condition equinoctial point place in diesel engine carries out linearization process to formula (1) and (2).Result after linearization process is expressed as follows with incremental form:

$\mathrm{\Δ}{\stackrel{\·}{m}}_{\mathrm{egr}}=\frac{\∂F_{\mathrm{egr}}}{\∂{\stackrel{\·}{m}}_f}\mathrm{\Δ}{\stackrel{\·}{m}}_f+\frac{\∂F_{\mathrm{egr}}}{\∂\mathrm{\ω}}+\frac{\∂F_{\mathrm{egr}}}{\∂{\mathrm{EGR}}_{\mathrm{pos}}}\mathrm{\Δ}{\mathrm{EGR}}_{\mathrm{pos}}+\frac{\∂F_{\mathrm{egr}}}{\∂{\mathrm{VGT}}_{\mathrm{pos}}}\mathrm{\Δ}{\mathrm{VGT}}_{\mathrm{pos}}---\left(3\right)$

$\mathrm{\Δ}{P}_{\mathrm{im}}=\frac{\∂F_p}{\∂{\stackrel{\·}{m}}_f}\mathrm{\Δ}{\stackrel{\·}{m}}_f+\frac{\∂F_p}{\∂\mathrm{\ω}}\mathrm{\Δ\ω}+\frac{\∂F_p}{\∂{\mathrm{EGR}}_{\mathrm{pos}}}\mathrm{\Δ}{\mathrm{EGR}}_{\mathrm{pos}}+\frac{\∂F_p}{\∂{\mathrm{VGT}}_{\mathrm{pos}}}\mathrm{\Δ}{\mathrm{VGT}}_{\mathrm{pos}}---\left(4\right)$

Can get thus:

$\left\{\begin{array}{c}\mathrm{\Δ}{\stackrel{\·}{m}}_{\mathrm{egr}}\\ \mathrm{\Δ}{P}_{\mathrm{im}}\\ \mathrm{\Δ}{\stackrel{\·}{m}}_f\\ \mathrm{\Δ\ω}\end{array}\right\}=\left[\begin{array}{cccc}\frac{\∂F_{\mathrm{egr}}}{\∂{\mathrm{EGR}}_{\mathrm{pos}}}& \frac{\∂F_{\mathrm{egr}}}{\∂{\mathrm{VGT}}_{\mathrm{pos}}}& \frac{\∂F_{\mathrm{egr}}}{\∂{\stackrel{\·}{m}}_f}& \frac{\∂F_{\mathrm{egr}}}{\∂\mathrm{\ω}}\\ \frac{\∂F_p}{\∂{\mathrm{EGR}}_{\mathrm{pos}}}& \frac{\∂F_p}{\∂{\mathrm{VGT}}_{\mathrm{pos}}}& \frac{\∂F_p}{\∂{\stackrel{\·}{m}}_f}& \frac{\∂F_p}{\∂\mathrm{\ω}}\\ 0& 0& 1& 0\\ 0& 0& 0& 1\end{array}\right]\left\{\begin{array}{c}\mathrm{\Δ}{\mathrm{EGR}}_{\mathrm{pos}}\\ \mathrm{\Δ}{\mathrm{VGT}}_{\mathrm{pos}}\\ \mathrm{\Δ}{\stackrel{\·}{m}}_f\\ \mathrm{\Δ\ω}\end{array}\right\}---\left(5\right)$

According to formula (5), it will be understood by those skilled in the art that the steady state condition place in diesel engine, its transfer function W can be expressed as:

$W(\mathrm{\ω},{\stackrel{\·}{m}}_f,{\mathrm{EGR}}_{\mathrm{pos}},{\mathrm{VGT}}_{\mathrm{pos}})=\left[\begin{array}{cccc}\frac{\∂F_{\mathrm{egr}}}{\∂{\mathrm{EGR}}_{\mathrm{pos}}}& \frac{\∂F_{\mathrm{egr}}}{\∂{\mathrm{VGT}}_{\mathrm{pos}}}& \frac{\∂F_{\mathrm{egr}}}{\∂{\stackrel{\·}{m}}_f}& \frac{\∂F_{\mathrm{egr}}}{\∂\mathrm{\ω}}\\ \frac{\∂F_p}{\∂{\mathrm{EGR}}_{\mathrm{pos}}}& \frac{\∂F_p}{\∂{\mathrm{VGT}}_{\mathrm{pos}}}& \frac{\∂F_p}{\∂{\stackrel{\·}{m}}_f}& \frac{\∂F_p}{\∂\mathrm{\ω}}\\ 0& 0& 1& 0\\ 0& 0& 0& 1\end{array}\right]---\left(6\right)$

Superincumbent formula (6), every in matrix $\frac{\∂F_{\mathrm{egr}}}{\∂{\mathrm{EGR}}_{\mathrm{pos}}},\frac{\∂F_{\mathrm{egr}}}{\∂{\mathrm{VGT}}_{\mathrm{pos}}},\frac{\∂F_{\mathrm{egr}}}{\∂{\stackrel{\·}{m}}_f},\frac{\∂F_{\mathrm{egr}}}{\∂{\stackrel{\·}{m}}_f}$ Can utilize motor at its each steady state condition equinoctial point (ω ^*

) floor data located demarcates.This type of floor data for example can obtain by test and/or the emulation for diesel engine.Especially, according to some mode of execution of the present invention, matrix entries $\frac{\∂F_{\mathrm{egr}}}{\∂{\mathrm{EGR}}_{\mathrm{pos}}},\frac{\∂F_{\mathrm{egr}}}{\∂{\mathrm{VGT}}_{\mathrm{pos}}},\frac{\∂F_{\mathrm{egr}}}{\∂{\stackrel{\·}{m}}_f},\frac{\∂F_{\mathrm{egr}}}{\∂{\stackrel{\·}{m}}_f}$ Can be engine condition variable (ω ^* ) multinomial or chart.

So far, in embodiments of the present invention, utilize the floor data of diesel engine in its stable operation zone floor data of steady working condition equinoctial point place (especially) to complete the demarcation to the motor transfer function.The below considers the decoupling zero transfer function (being designated as G) that decoupling zero computing device 204 will calculate.Be similar to transfer function W, In some embodiments of the present invention, decoupling zero transfer function G is equally with rotational speed omega and the fuel injection rate of motor

Be independent variable, and can be defined as follows:

$G(\mathrm{\ω},{\stackrel{\·}{m}}_f,{\mathrm{EGR}}_{\mathrm{pos}},{\mathrm{VGT}}_{\mathrm{pos}})=\left[\begin{array}{cccc}{G}_{11}& G_{12}& G_{13}& G_{14}\\ G_{21}& G_{22}& G_{23}& G_{24}\\ 0& 0& 1& 0\\ 0& 0& 0& 1\end{array}\right]---\left(7\right)$

In an embodiment of the invention, for actual conditions and the theory expectation that makes transmitter mates to greatest extent, establish the contrary of the configurable steady state transfer function W for calculation engine of decoupling zero computing device 204, as steady state decoupling transfer function G.That is:

$G(\mathrm{\ω},{\stackrel{\·}{m}}_f,{\mathrm{EGR}}_{\mathrm{pos}},{\mathrm{VGT}}_{\mathrm{pos}})=W{(\mathrm{\ω},{\stackrel{\·}{m}}_f,{\mathrm{EGR}}_{\mathrm{pos}},{\mathrm{VGT}}_{\mathrm{pos}})}^{-1}---\left(8\right)$

According to formula (6)-(8), can try to achieve every in decoupling zero transfer function G:

$G_{11}=\frac{\frac{\∂F_p}{\∂{\mathrm{VGT}}_{\mathrm{pos}}}}{\frac{\∂F_{\mathrm{egr}}}{\∂{\mathrm{EGR}}_{\mathrm{pos}}}\frac{\∂F_p}{\∂{\mathrm{VGT}}_{\mathrm{pos}}}-\frac{\∂F_{\mathrm{egr}}}{\∂{\mathrm{VGT}}_{\mathrm{pos}}}\frac{\∂F_p}{\∂{\mathrm{EGR}}_{\mathrm{pos}}}}$

$G_{12}=\frac{-\frac{\∂F_{\mathrm{egr}}}{\∂{\mathrm{VGT}}_{\mathrm{pos}}}}{\frac{\∂F_{\mathrm{egr}}}{\∂{\mathrm{EGR}}_{\mathrm{pos}}}\frac{\∂F_p}{\∂{\mathrm{VGT}}_{\mathrm{pos}}}-\frac{\∂F_{\mathrm{egr}}}{\∂{\mathrm{VGT}}_{\mathrm{pos}}}\frac{\∂F_p}{\∂{\mathrm{EGR}}_{\mathrm{pos}}}}$

$G_{13}=\frac{\frac{\∂F_{\mathrm{egr}}}{\∂{\mathrm{VGT}}_{\mathrm{pos}}}\frac{\∂F_p}{\∂{\stackrel{\·}{m}}_f}-\frac{\∂F_{\mathrm{egr}}}{\∂{\stackrel{\·}{m}}_f}\frac{\∂F_p}{\∂{\mathrm{VGT}}_{\mathrm{pos}}}}{\frac{\∂F_{\mathrm{egr}}}{\∂{\mathrm{EGR}}_{\mathrm{pos}}}\frac{\∂F_p}{\∂{\mathrm{VGT}}_{\mathrm{pos}}}-\frac{\∂F_{\mathrm{egr}}}{\∂{\mathrm{VGT}}_{\mathrm{pos}}}\frac{\∂F_p}{\∂{\mathrm{EGR}}_{\mathrm{pos}}}}$

$G_{14}=\frac{\frac{\∂F_{\mathrm{egr}}}{\∂{\mathrm{VGT}}_{\mathrm{pos}}}\frac{\∂F_p}{\∂\mathrm{\ω}}-\frac{\∂F_{\mathrm{egr}}}{\∂\mathrm{\ω}}\frac{\∂F_p}{\∂{\mathrm{VGT}}_{\mathrm{pos}}}}{\frac{\∂F_{\mathrm{egr}}}{\∂{\mathrm{EGR}}_{\mathrm{pos}}}\frac{\∂F_p}{\∂{\mathrm{VGT}}_{\mathrm{pos}}}-\frac{\∂F_{\mathrm{egr}}}{\∂{\mathrm{VGT}}_{\mathrm{pos}}}\frac{\∂F_p}{\∂{\mathrm{EGR}}_{\mathrm{pos}}}}$

$G_{21}=\frac{-\frac{\∂F_p}{\∂{\mathrm{EGR}}_{\mathrm{pos}}}}{\frac{\∂F_{\mathrm{egr}}}{\∂{\mathrm{EGR}}_{\mathrm{pos}}}\frac{\∂F_p}{\∂{\mathrm{VGT}}_{\mathrm{pos}}}-\frac{\∂F_{\mathrm{egr}}}{\∂{\mathrm{VGT}}_{\mathrm{pos}}}\frac{\∂F_p}{\∂{\mathrm{EGR}}_{\mathrm{pos}}}}$

$G_{22}=\frac{\frac{\∂F_{\mathrm{egr}}}{\∂{\mathrm{EGR}}_{\mathrm{pos}}}}{\frac{\∂F_{\mathrm{egr}}}{\∂{\mathrm{EGR}}_{\mathrm{pos}}}\frac{\∂F_p}{\∂{\mathrm{VGT}}_{\mathrm{pos}}}-\frac{\∂F_{\mathrm{egr}}}{\∂{\mathrm{VGT}}_{\mathrm{pos}}}\frac{\∂F_p}{\∂{\mathrm{EGR}}_{\mathrm{pos}}}}$

$G_{23}=\frac{\frac{\∂F_{\mathrm{egr}}}{\∂{\stackrel{\·}{m}}_f}\frac{\∂F_p}{\∂{\mathrm{EGR}}_{\mathrm{pos}}}-\frac{\∂F_{\mathrm{egr}}}{\∂{\mathrm{EGR}}_{\mathrm{pos}}}\frac{\∂F_p}{\∂{\stackrel{\·}{m}}_f}}{\frac{\∂F_{\mathrm{egr}}}{\∂{\mathrm{EGR}}_{\mathrm{pos}}}\frac{\∂F_p}{\∂{\mathrm{VGT}}_{\mathrm{pos}}}-\frac{\∂F_{\mathrm{egr}}}{\∂{\mathrm{VGT}}_{\mathrm{pos}}}\frac{\∂F_p}{\∂{\mathrm{EGR}}_{\mathrm{pos}}}}$

$G_{24}=\frac{\frac{\∂F_{\mathrm{egr}}}{\∂\mathrm{\ω}}\frac{\∂F_p}{\∂{\mathrm{EGR}}_{\mathrm{pos}}}-\frac{\∂F_{\mathrm{egr}}}{\∂{\mathrm{EGR}}_{\mathrm{pos}}}\frac{\∂F_p}{\∂\mathrm{\ω}}}{\frac{\∂F_{\mathrm{egr}}}{\∂{\mathrm{EGR}}_{\mathrm{pos}}}\frac{\∂F_p}{\∂{\mathrm{VGT}}_{\mathrm{pos}}}-\frac{\∂F_{\mathrm{egr}}}{\∂{\mathrm{VGT}}_{\mathrm{pos}}}\frac{\∂F_p}{\∂{\mathrm{EGR}}_{\mathrm{pos}}}}$

So far, can utilize motor in its stable operation zone floor data and the transfer function W that demarcates calculates decoupling zero transfer function G.As will be detailed later, by decoupling zero transfer function G is acted on corresponding physical quantity, can produce independently of one another the driving signal for egr system and turbo charge system, thereby the decoupling zero that effectively realizes these two is controlled.

Note, above-described is only some illustrative embodiments of the present invention.For example, the feature of motor is not limited to only be characterized by rotating speed and fuel injection rate.It will be apparent to one skilled in the art that transfer function W and decoupling zero transfer function G can include any relevant operating mode of motor in consideration (that is, as independent variable).And for example, decoupling zero transfer function G being calculated as the contrary of motor transfer function W is a kind of optional mode of execution.Those skilled in the art can in conjunction with actual conditions, come computation decoupling transfer function G in other different modes according to transfer function W and duty parameter.The present invention is all unrestricted in these areas.

Continuation is with reference to figure 2, and according to the embodiment of the present invention, control apparatus 200 can also comprise air system parameter processing apparatus 206, and it is coupled to operating mode obtaining device 202, and configuration is for the treatment of the parameter of the state of the air system of indication diesel engine.

Especially, In some embodiments of the present invention, the status parameter of air system can comprise: EGR flow rate and the suction pressure of diesel engine.Correspondingly, in these mode of executions, as mentioned above, operating mode obtaining device 202 can comprise EGR flow rate obtaining device 2026, and configuration (is designated as for the parameter of the actual EGR flow rate that obtains the indication motor ); And suction pressure obtaining device 2028, configuration (is designated as P for the parameter of the actual suction pressure that obtains the indication motor _{Im, act}).Operating mode obtaining device 202 can offer air system parameter processing apparatus 206 with actual EGR flow rate and the actual suction pressure that obtains, as shown in Figure 2.

In addition, as shown in Figure 2, air system parameter processing apparatus 206 also configurable target EGR flow rate for receiving diesel engine (is designated as

) and the target suction pressure (be designated as P _{Im, des}).For example, In some embodiments of the present invention,

And P _{Im, act}Can demarcate in advance, and can be pre-stored in for example addressable memory device of control apparatus 200 or database.

Given actual value

P _{Im, act}And desired value

And P _{Im, des}, air system parameter processing apparatus 206 is configurable generates for carrying out the processing that drives signal necessity.For example, according to some mode of execution of the present invention, air system parameter processing apparatus 206 can comprise: configuration is used for determining actual EGR flow rate With target EGR flow rate

Between error (be designated as e _m) device.Air system parameter processing apparatus 206 can also comprise: configuration is used for determining actual suction pressure P _{Im, act}With target suction pressure P _{Im, des}Between error (be designated as e _P) device.In addition, air system parameter processing apparatus 206 can also comprise: configuration is used for error e respectively _mAnd e _PCarry out the device that PID processes, the gained processing result will be by signal generation device 208 (described below) in order to produce control signal.The said apparatus that comprises in air system parameter processing apparatus 206 and operation thereof are known in the art, therefore do not illustrate in the drawings, also no longer describe in detail at this.

Should be appreciated that above-described EGR flow rate, suction pressure, PID processing etc. are only exemplary.In fact, air system parameter processing apparatus 206 can configure for the status parameter of air system being carried out the known or any suitable processing of exploitation in the future at present.

Continuation is with reference to figure 2, control apparatus 200 also comprises signal generation device 208, it is coupled to decoupling zero computing device 204 and air system parameter processing apparatus 206, configuration is used for according to from the decoupling zero transfer function G of decoupling zero computing device 204 with from the processing result of air system parameter processing apparatus 206, produces respectively to be used for first of egr system and to drive signal and be used for second of turbo charge system and drive signal.

With reference now to Fig. 4,, it shows the schematic diagram of the exemplary operation mechanism of signal generation device 208.In the example of Fig. 4, with above describe similar, transfer function W and decoupling zero transfer function G with the rotating speed of diesel engine and fuel injection rate as independent variable.And the status parameter of air system is EGR flow rate and suction pressure.

In Fig. 4, the part in dotted line 401 left sides can represent the operation of air system parameter processing apparatus 206, also, and to the actual EGR flow rate of diesel engine

Target EGR flow rate

Actual suction pressure P _{Im, act}With target suction pressure P _{Im, des}Carry out necessary processing.As mentioned above, according to the embodiment of the present invention, described operation can comprise determines EGR flow rate error e _mWith the suction pressure error e _P, and with e _mAnd e _PBe fed to respectively the independent control C for EGR ₁With the independent control C that is used for VGT ₂According to some mode of execution, controller C ₁And C ₂Respectively can be to e _mAnd e _PCarrying out PID processes.

Each G of transfer function G shown in Fig. 4 ₁₁, G ₁₂, G ₁₃, G ₁₄, G ₂₁, G ₂₂, G ₂₃And G ₂₄Can be calculated by decoupling zero computing device 204 as indicated abovely, and offer signal generation device 208.Thus, the control signal S that is used for EGR valve and pressure charging valve ₁And S ₂Can be expressed as respectively:

$S_1=G_{11}{C}_1\left(s\right)+G_{12}{C}_2\left(s\right)+G_{13}{\stackrel{\·}{m}}_f+G_{14}\mathrm{\ω}---\left(3\right)$

$S_2=G_{21}{C}_1\left(s\right)+G_{22}{C}_2\left(s\right)+G_{23}{\stackrel{\·}{m}}_f+G_{24}\mathrm{\ω}---\left(4\right)$

C wherein ₁(s) and C ₂(s) submeter represents controller C ₁And C ₂To error signal e _mAnd e _PProcessing result.For example, when controller, error signal is carried out in the mode of execution of PID C ₁(s)=PID (e _m) and C ₂(s)=PID (e _P).The the first control signal S that obtains thus ₁With the second control signal S ₂Egr system and pressurization system be can be respectively used to control, for example, EGR valve opening and pressure charging valve aperture controlled.

Be appreciated that the exemplary operation mechanism that only shows signal generation device 208 in Fig. 4.In other embodiments, signal generation device 208 is configurable in a different manner decoupling zero transfer function G being acted on the relevant parameters of EGR flow rate and suction pressure, thereby produces the driving signal in the decoupling zero mode.

Above in conjunction with some embodiments, structure and operation according to control apparatus 200 of the present invention have been described.Description by above is to be understood that, according to the embodiment of the present invention, control apparatus 200 can produce driving signal for EGR valve and pressure charging valve according to a kind of mode independent of each other, thereby decoupling zero gas recirculation system and turbo charge system effectively under stable state improve the control to the air system of diesel engine thus.

Should be appreciated that shown in Fig. 2 and at above-described control apparatus 200 to utilize various ways to implement.For example, in some embodiments, equipment 200 can be implemented as intergrated circuit (IC) chip or specific integrated circuit (ASIC).In other mode of executions, equipment 200 can be realized by SOC(system on a chip) (SoC) and corresponding software and/or firmware.Alternatively or additionally, equipment 200 can also utilize software module to realize, namely is embodied as computer program.Scope of the present invention is unrestricted in this regard.

With reference to figure 5, it shows the structured flowchart of the SOC(system on a chip) (SoC) 500 that is suitable for implementing control apparatus shown in Figure 2 200.As shown in Figure 5, SoC 500 comprises various assemblies, such as input output (I/O) logic 510 (for example in order to comprise electronic circuit) and microprocessor 512 (for example, any microcontroller or DSP digital signal processor).SoC 500 also comprises storage 514, and it can be the random access storage device (RAM) of any type, low nonvolatile memory (for example, flash memory), ROM (read-only memory) (ROM) and/or other the suitable electronic data storage of postponing.SoC 500 can also comprise various firmwares and/or software, and such as operation system 516, it can be the computer executable instructions of being safeguarded and being carried out by microprocessor 512 by storage 514.SoC 500 can also comprise other various communication interfaces and assembly, network interface components, other hardware, firmware and/or software.

Especially, as shown in the figure, SoC 500 can comprise that operating mode obtains piece 502, decoupling zero computing block 504, air system parameter processing block 506 and signal generation block 508, and it corresponds respectively to operating mode obtaining device 202, decoupling zero computing device 204, air system parameter processing apparatus 206 and the signal generation device 208 of above describing with reference to figure 2.In addition, although not shown in Fig. 4, according to the embodiment of the present invention, operating mode is obtained the sub-block that piece 502 can comprise the device 2022-2028 that corresponds respectively in Fig. 2.These pieces 502-508 and sub-block thereof can be used as hardware, software and/or firmware module, integrally operate mutually independently or with other entities such as signal processing and control circuits, in order to realize various mode of execution described here and/or feature.

Should be appreciated that according to the embodiment of the present invention, SoC 500 can be integrated with required other hardware, firmware and/or the software of electronic circuit, microprocessor, storage, input output (I/O) logic, communication interface and assembly, the whole equipment of operation.SoC 500 can also comprise integrated data bus (not shown), and each assembly of its coupling SoC is to be used for the data communication between assembly.The equipment that comprises SoC 500 can also utilize a plurality of combinations of different assemblies to realize.

Below with reference to Fig. 6, it shows the flow chart according to the controlling method 600 of the air system that is used for diesel engine of embodiment of the present invention.After method 600 beginnings, at step S602, obtain the parameter of the actual conditions of indication diesel engine, these parameters include but not limited to: the rotating speed of diesel engine and fuel injection rate.

Next, at step S604, according to the parameter that obtains in step S602 and the transfer function that characterizes this diesel engine (for example, above-described transfer function W), the computation decoupling transfer function (for example, above-described decoupling zero transfer function G), wherein transfer function W demarcates at the floor data in its stable operation zone according to diesel engine.

Then, at step S606, process the parameter of the state of the air system of indicating diesel engine.According to some mode of execution of the present invention, the status parameter of air system comprises EGR flow rate and the suction pressure of diesel engine.In such mode of execution, as mentioned above, can be according to actual value and the desired value of EGR flow rate and suction pressure, determine both error separately, and for example carry out to error that PID processes for future use.Certainly, other air system status parameters and processing are also possible, and the present invention is unrestricted in this regard.

At last, at step S608, according to from the decoupling zero transfer function of step S604 with from the processing result of step S606, produce respectively and be used for first of egr system and drive signal and be used for second of turbo charge system and drive signal.Method 600 finishes immediately.

The step S602-S608 that is appreciated that in method 600 record corresponds respectively to above operation and/or the function of the device 202-208 in the control apparatus 200 of describing with reference to figure 2.Thus, the feature of above describing with reference to each device of control apparatus 200 is equally applicable to each step of method 600.And in method 600, each step of record can be carried out and/or executed in parallel according to different orders.

In addition, should be appreciated that the method 600 of describing with reference to figure 6 can 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 the step of manner of execution 600 when computer-readable code part.

Above spirit of the present invention and principle have been explained in conjunction with some embodiments.According to the embodiment of the present invention, provide a kind of equipment and method that can be under stable state the air system of diesel engine be control effectively.In control procedure, according to the duty parameter of transfer function and the diesel engine of motor, computation decoupling transfer function.By this decoupling zero transfer function being acted on the processing result to the relevant parameters of the EGR flow rate of motor and suction pressure, can produce independently of one another the driving signal for EGR (EGR) system and turbo charge system.Especially, according to the embodiment of the present invention, transfer function is the floor data in its stable operation zone and demarcating based on diesel engine.In this way, embodiments of the present invention have guaranteed the control independently of each other under steady state condition of exhaust gas recirculation valve and turbosupercharging valve, and can demarcate respectively.Thus, both reached these two tersenesses that system demarcates, significantly improved the functional characteristic of air control system for air.

Should be noted that embodiments of the present invention can realize by the combination of hardware, software or software and hardware.Hardware components can utilize special logic to realize; Software section can be stored in storage, and by suitable instruction execution system, for example microprocessor or special designs hardware are carried out.Those having ordinary skill in the art will appreciate that above-mentioned equipment and method can and/or be included in the processor control routine with computer executable instructions realizes, for example provides such code on such as the mounting medium of disk, CD or DVD-ROM, such as the programmable memory of ROM (read-only memory) (firmware) or the data medium such as optics or electronic signal carrier.Equipment of the present invention and module thereof can be by such as vlsi circuit or gate array, realize such as the semiconductor of logic chip, transistor etc. or such as the hardware circuit of the programmable hardware device of field programmable gate array, programmable logic device etc., also can use the software of being carried out by various types of processors to realize, also can by the combination of above-mentioned hardware circuit and software for example firmware realize.

Although should be noted that some devices or the sub-device of having mentioned control apparatus in above-detailed, this division is not only enforceable.In fact, according to the embodiment of the present invention, the feature of above-described two or more devices and function can be specialized in a device.Otherwise, the feature of an above-described device and function can Further Division for to be specialized by a plurality of devices.

In addition, although described in the accompanying drawings the operation of the inventive method with particular order,, this is not that requirement or hint must be carried out these operations according to this particular order, or the operation shown in must carrying out all could realize the result of expectation.On the contrary, the step of describing in flow chart can change execution sequence.Additionally or alternatively, can omit some step, a plurality of steps be merged into a step carry out, and/or a step is decomposed into a plurality of steps carries out.

Although described the present invention with reference to some embodiments, should be appreciated that, the present invention is not limited to disclosed embodiment.The present invention is intended to contain interior included various modifications and the equivalent arrangements of spirit and scope of claims.The scope of claims meets the most wide in range explanation, thereby comprises all such modifications and equivalent structure and function.

Claims (18)

1. equipment that is used for controlling the air system of diesel engine under stable state, wherein said air system comprises gas recirculation system and turbo charge system, described equipment comprises:

The operating mode obtaining device, configuration is used for obtaining the parameter of the actual conditions of indicating described diesel engine;

The decoupling zero computing device, it is coupled to described operating mode obtaining device, configuration is used for according to coming the computation decoupling transfer function from the described parameter of described operating mode obtaining device and the transfer function that characterizes described diesel engine, and wherein said transfer function is the floor data in its stable operation zone and demarcating based on described diesel engine;

The air system parameter processing apparatus, it is coupled to described operating mode obtaining device, and configuration is for the treatment of the parameter of the state of the described air system of indication; And

Signal generation device, it is coupled to described decoupling zero computing device and described air system parameter processing apparatus, configuration is used for according to from the described decoupling zero transfer function of described decoupling zero computing device with from the processing result of described air system parameter processing apparatus, produces to be used for first of described gas recirculation system and to drive signal and be used for second of described turbo charge system and drive signal.

2. the floor data at equipment as claimed in claim 1, the transfer function of the wherein said diesel engine steady state condition equinoctial point place in its stable operation zone based on described diesel engine and demarcating.

3. equipment as claimed in claim 2, wherein said steady state condition equinoctial point is waiting the air inlet pressure line of force and waiting the recirculated exhaust gas flow line and determine in its stable operation zone based on described diesel engine.

4. equipment as claimed in claim 1, as independent variable, described operating mode obtaining device further comprises wherein said transfer function with the rotating speed of described diesel engine, fuel injection rate:

The rotating speed obtaining device, configuration is used for obtaining the parameter of the rotating speed of indicating described diesel engine; And

The fuel injection rate device, configuration is used for obtaining the parameter of the fuel injection rate of indicating described diesel engine.

5. equipment as claimed in claim 1, wherein said air system parameter processing apparatus further comprises:

Configuration is used for determining the actual recirculated exhaust gas flow rate of described diesel engine and the device of the error between target recirculated exhaust gas flow rate;

Configuration is used for carrying out for recirculated exhaust gas flow rate error the device that PID processes;

Configuration is used for determining the actual suction pressure of described diesel engine and the device of the error between the target suction pressure; And

Configuration is used for carrying out for the suction pressure error device that PID processes.

6. equipment as claimed in claim 5, wherein said operating mode obtaining device further comprises:

Recirculated exhaust gas flow rate obtaining device, configuration is used for obtaining the parameter of the actual recirculated exhaust gas flow rate of indicating described diesel engine, and provides it to described air system parameter processing apparatus; And

The suction pressure obtaining device, configuration is used for obtaining the parameter of the actual suction pressure of indicating described diesel engine, and provides it to described air system parameter processing apparatus.

7. equipment as claimed in claim 1, wherein said decoupling zero computing device further comprises: configuration is used for calculating the contrary device as described decoupling zero transfer function of described transfer function.

8. equipment as claimed in claim 1, wherein said first drives the aperture that signal is used for controlling the exhaust gas recirculation valve of described gas recirculation system, and wherein said second drives the aperture that signal is used for controlling the pressure charging valve of turbo charge system.

9. equipment as claimed in claim 1, wherein said equipment utilization following at least one realize: SOC(system on a chip) SoC, IC, and application-specific integrated circuit ASIC.

10. diesel engine comprises:

Cylinder block;

Admission line is coupled to the entry end of described cylinder block, and configuration is used for carrying gas to described cylinder block;

Exhaust duct is coupled to the outlet end of described cylinder block, and configuration is used for discharging the waste gas of described cylinder block burning;

Fuel injection system is coupled to described cylinder block, and configuration is used for to described cylinder block injected fuel;

Air system comprises:

Gas recirculation system is coupled to described exhaust duct and described admission line, and configuration is used for and will be transmitted back to described cylinder block by described admission line from the part waste gas of described exhaust duct; And

Turbo charge system is coupled to described exhaust duct, and configuration is used for being used to waste gas from described exhaust duct and increases suction pressure by described cylinder block; And

Control unit comprises equipment as claimed in claim 1, to be used for controlling described air system under stable state.

11. a method that is used for controlling the air system of diesel engine under stable state, wherein said air system comprises gas recirculation system and turbo charge system, and described method comprises:

Obtain the parameter of the actual conditions of the described diesel engine of indication;

Come the computation decoupling transfer function according to described parameter and the transfer function that characterizes described diesel engine, wherein said transfer function is the floor data in its stable operation zone and demarcating based on described diesel engine;

Process the parameter of the state of the described air system of indication; And

According to the result of described decoupling zero transfer function and described processing, produce the first driving signal that is used for described gas recirculation system and drive signal for second of described turbo charge system.

12. the floor data at method as claimed in claim 11, the described transfer function of the wherein said diesel engine steady state condition equinoctial point place in its stable operation zone based on described diesel engine and demarcating.

13. method as claimed in claim 12, wherein said steady state condition equinoctial point be waiting the air inlet pressure line of force and waiting the recirculated exhaust gas flow line and determine in its stable operation zone based on described diesel engine.

14. as independent variable, and described obtaining further comprises with the rotating speed of described diesel engine and fuel injection rate for method as claimed in claim 11, wherein said transfer function:

Obtain the parameter of the rotating speed of the described diesel engine of indication; And

Obtain the parameter of the fuel injection rate of the described diesel engine of indication.

15. method as claimed in claim 11, the parameter of the state of the described air system of its indicating comprises recirculated exhaust gas flow rate and the suction pressure of described diesel engine, and wherein said processing comprises:

Determine the actual recirculated exhaust gas flow rate of described diesel engine and the error between target recirculated exhaust gas flow rate;

Carrying out PID for recirculated exhaust gas flow rate error processes;

Determine the actual suction pressure of described diesel engine and the error between the target suction pressure; And

Carrying out PID for the suction pressure error processes.

16. method as claimed in claim 15, wherein said obtaining further comprises:

Obtain the parameter of the actual recirculated exhaust gas flow rate of the described diesel engine of indication; And

Obtain the parameter of the actual suction pressure of the described diesel engine of indication.

17. method as claimed in claim 11 is wherein calculated described decoupling zero transfer function and is comprised:

Calculate the contrary as described decoupling zero transfer function of described transfer function.

18. method as claimed in claim 11, wherein said first drives signal for the aperture of the exhaust gas recirculation valve of controlling described gas recirculation system, and wherein said second drives the aperture that signal is used for the pressure charging valve of control turbo charge system.

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