CN201953488U - Device for controlling air system of diesel engine, and diesel engine - Google Patents

Abstract

The embodiment of the utility model relates to a device for controlling an air system of a diesel engine, in particular to a device for controlling the air system of the diesel engine in a stable state; the air system comprises an exhaust gas recirculation system and a turbine pressurizing system; and the device comprises a working condition acquisition device, a decoupling calculating device, a parameter processing device of the air system and a signal generating device. According to the embodiment of the utility model, the exhaust gas recirculation system and the turbine pressurizing system can be controlled in a mutually independent way in a stable state, and can be respectively demarcated. The utility model also discloses the corresponding diesel engine.

Description

Be used to control the equipment and the diesel engine of the air system of diesel engine

Technical field

Mode of execution of the present utility model relates generally to diesel engine, more specifically, relates to the equipment of the air system that is used to control diesel engine and the diesel engine that comprises this equipment.

Background technique

Along with the continuous development of motor theory and technology, exhaust gas recirculation (EGR) system has become the important component part in the diesel engine.In the waste gas that diesel engine is discharged, contain a large amount of oxynitrides (NOx) usually, 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 forming process in the firing chamber to slow down, thereby reduce oxynitrides effectively.In addition, improve ER EGR Rate total exhaust gas flow is reduced, so total pollutant output quantity will be reduced in the toxic emission.

Except that EGR, for the power performance, the improvement burning that improve diesel engine, turbo charge system also is one of important component part in the 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, by devices such as pressurized machine rotating shafts with propagation of pressure to air compressor, thereby 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 for 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 to improve the NOx discharging and reduce its key to particulate matter and power and economic influence.In this motor, the flow of the input waste gas of cooler for recycled exhaust gas is by the control of EGR valve, and the two all receives the engine exhaust of discharging from exhaust duct the turbine entry end of the entry end of EGR valve and turbosupercharger.Be appreciated that the boost pressure that pressurization system caused and the variation of exhaust back pressure also can exert an influence to the EGR flow rate except that 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 are had is the difficult point of diesel engine air system control all the time, and the multivariable Control strategy of controlling both simultaneously also is the research focus 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 promptly is control target with the boost pressure, adds transient state Feed-forward Control Strategy driving VGT valve by PID (proportional-integral-differential) control and makes actual supercharge pressure reach desired value; With the air mass flow is control target, and the control strategy driving EGR valve that adds the transient state feedforward by PID control makes actual air flow reach desired value.

(2) be control target with inlet air flow and boost pressure, according to air system mean value model is carried out local linearization, according to linear model devise optimum or robust controller, thereby further expand to the method that the whole working condition scope obtains non-linear control strategy again: as the infinite control of 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) be control target with inlet air flow and boost pressure, according to the controller design method of non-analytical model: as the fuzzy logic control method, according to controlling method of neuron network etc.

(4) be control target with inlet air flow and boost pressure, 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 minimizes objective function.

(5) with sky right than with suction tude in the exhaust mass mark be control target, adopt air system contraction decoupling control policy, the transfer function matrix that is air system is contraction in some cases, therefore, two control target 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 good Steady-State Control effect, and it is little to be used for the experiment work amount of demarcation of parameter.The shortcoming of independent closed loop PID control is because the coupled characteristic of system itself makes that the control effect of its dynamic process is undesirable, occurs the phenomenon of smoldering easily in the process of quickening.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, companies such as Cummins do not adopt air mass flow and boost pressure as desired value in actual use, lead the control strategy of replacement boost pressure as desired value and adopted 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 still is reliability, make the EGR flow mainly obtain by estimation.And influencing the 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 according to the control system test of the method very huge.Though above control strategy can both be obtained effect preferably in Steady-State Control, but because gas recirculation system and pressurization system act on suction tude simultaneously, there is coupled characteristic, and do not have in the control strategy at this coupled characteristic design transient control strategy, so transient control effect is often unsatisfactory.

With inlet air flow and boost pressure is that control strategy (2)-(4) of control target exist the accuracy of air system control strategy to require and terseness requires tangible contradiction of formation.This contradiction is directed to the strong coupling and the non-linear correlation of gas recirculation system and pressurization system.The requirement that all can't satisfy stable state and mapping according to the independent closed loop control strategy and its distortion of air mass flow and boost pressure.Various theoretical research result are because the complexity of control strategy, to the requirement of control hardware, and many-sided factors such as difficulty of parameter calibration, the also requirement of incompatibility actual control system.

And for adopt empty right than with 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 the suction tude, so can not realize being the feedback control of control target directly with this parameter.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 control is disadvantageous to instantaneous conditions.

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

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

The model utility content

In order to overcome the above-mentioned defective that exists in the prior art, mode of execution of the present utility model provides a kind of equipment of more effectively controlling the air system of diesel engine under stable state.

Aspect one of the present utility model, a kind of equipment that is used for the air system of control diesel engine under stable state is provided, wherein said air system comprises gas recirculation system and turbo charge system, described equipment comprises: the operating mode obtaining device, and configuration is used to obtain 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, and configuration is used for according to calculating the decoupling zero transfer function from the described parameter of described operating mode obtaining device and the transfer function that characterizes described diesel engine; The air system parameter processing apparatus, it is coupled to described operating mode obtaining device, and configuration is used to handle the parameter of the state of indicating described air system; And signal generation device, it is coupled to described decoupling zero computing device and described air system parameter processing apparatus, configuration is used for producing first drive signal that is used for described gas recirculation system and second drive signal that is used for described turbo charge system 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.

In some optional mode of execution, described transfer function with the rotating speed of described diesel engine and fuel injection rate as independent variable, described operating mode obtaining device further comprises: the rotating speed obtaining device, and configuration is used to obtain the parameter of the rotating speed of indicating described diesel engine; And the fuel injection rate device, configuration is used to obtain the parameter of the fuel injection rate of indicating described diesel engine.

In some optional mode of execution, described 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 the target recirculated exhaust gas flow rate; Configuration is used for carrying out the device that PID handles at recirculated exhaust gas flow rate error; 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 the device that PID handles at the suction pressure error.

In some optional mode of execution, described operating mode obtaining device further comprises: recirculated exhaust gas flow rate obtaining device, configuration is used to obtain 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 to obtain the parameter of the actual suction pressure of indicating described diesel engine, and provides it to described air system parameter processing apparatus.

In some optional mode of execution, described decoupling zero computing device further comprises: configuration is used to calculate the contrary device as described decoupling zero transfer function of described transfer function.

In some optional mode of execution, described first drive signal is used to control the aperture of the exhaust gas recirculation valve of described gas recirculation system, and wherein said second drive signal is used to control the aperture of the pressure charging valve of turbo charge system.

In some optional mode of execution, described equipment utilization SOC(system on a chip) SoC or IC are realized.

According on the other hand of the present utility model, a kind of diesel engine is provided, comprising: cylinder block; Admission line is coupled to the entry end of described cylinder block, and configuration is used for to described cylinder block conveying gas; Exhaust duct is coupled to the outlet end of described cylinder block, and configuration is used to discharge 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 mode of execution of the present utility model, air system comprises: gas recirculation system, be coupled to described exhaust duct and described admission line, and configuration is used for the part waste gas from described exhaust duct is carried back described cylinder block by described admission line; And turbo charge system, being coupled to described exhaust duct, configuration is used to be 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 the described air system of control under stable state.

According to mode of execution of the present utility model, provide a kind of equipment that can be under stable state the air system of diesel engine be control effectively.In mode of execution of the present utility model, utilize transfer function to characterize the feature of diesel engine.In control procedure,, calculate the decoupling zero transfer function according to the parameter of this transfer function and indication diesel engine operating mode.As will be detailed later, the decoupling zero transfer function is one of core concept of the present utility model, is used to guarantee produce independently of one another at the drive signal of EGR valve with at the drive signal of pressure charging valve, thereby realizes the two decoupling zero.Particularly, by this decoupling zero transfer function being acted on treated air system status parameter (for example, the EGR flow rate and the suction pressure of motor), can realize the decoupling zero of these two drive signals, this will be explained below.

In this way, mode of execution of the present utility model has 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, significantly improved the functional characteristic of air control system for air these two tersenesses that system demarcates.

Description of drawings

By reading detailed description hereinafter with reference to the accompanying drawings, above-mentioned and other purposes of the utility model mode of execution, the feature and advantage easy to understand that will become.In the accompanying drawings, show plurality of embodiments of the present utility model in exemplary and nonrestrictive mode, wherein:

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

Fig. 2 shows the schematic diagram according to the control apparatus 200 of the air system that is used for diesel engine of the utility model mode of execution;

The decoupling zero transfer function of utilizing that Fig. 3 shows according to the utility model mode of execution produces the schematic representation of two class drive signals independently of one another;

Fig. 4 shows the schematic diagram of the SOC(system on a chip) (SoC) 400 that is suitable for being used for putting into practice the control apparatus 200 among Fig. 2; And

Fig. 5 shows the flow chart according to the controlling method 500 of the air system that is used for diesel engine of the utility model mode of execution.

In the accompanying drawings, identical or corresponding label is represented identical or corresponding part.

Embodiment

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

According to mode of execution of the present utility model, a kind of equipment that is used to control the air system of diesel engine has been proposed.Should be noted that in this article employed term " air system " comprises exhaust gas recirculation egr system and turbo charge system at least.

It shall yet further be noted that for example variable geometry turbine system concrete turbo charge systems of mentioning in this article such as (VGT), only is for explanation and serve exemplary purposes.Mode of execution of the present utility model is 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 utility model is unrestricted in this regard.

In addition, in this article, employed term " 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 be exchanged use.For example, " parameter of indication rotating speed " has the implication that is equal in this article with " rotating speed ".

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

Below with reference to some representative embodiments of the present utility model, explained in detail principle of the present utility model 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 exhaust gas recirculation and turbo charge system.Should be appreciated that and only show part relevant in the diesel engine 100 among Fig. 1 with mode of execution of the present utility model.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 to cylinder block 108 conveying gas; Exhaust duct 112 is coupled to the outlet end of cylinder block 108, and configuration is used to discharge 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 to realize control to 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 the part waste gas from exhaust duct 112 is carried return-air cylinder body 108 by admission line 106; 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, be used to be used to waste gas, increase suction pressure by cylinder block 108 from exhaust duct 112.

As can be seen from Fig. 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 applied for the aperture of control EGR valve 116 and pressure charging valve 122.As mentioned above, the performance of gas recirculation system and turbo charge system influences each other, therefore need 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 the utility model mode of execution.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 at the air system of diesel engine.

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

In addition, according to mode of execution of the present utility model, 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.

Should be appreciated that operating mode obtaining device 202 (and comprising sub-device 2022-2028) can obtain the duty parameter of motor by actual measurement.Alternatively or additionally, operating mode obtaining device 202 also can be according to physical condition by estimating or the duty parameter of motor is obtained in estimation.Scope of the present utility model is unrestricted in this regard.

And, it is also understood that device 2022-2028 only is the example that can be included in the device in the 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 to obtain other duty parameters of diesel engine.This is that those skilled in the art expect easily, and scope of the present utility model is unrestricted equally in this regard.

As described in Figure 2, according to mode of execution of the present utility model, 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, calculate the decoupling zero transfer function according to the transfer function that characterizes engine features.Below in conjunction with concrete example, describe the feature and the operation of decoupling zero computing device 204 in detail.

As known in the art, 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, or the like.Especially, as indicated above, one of main purpose of the utility model mode of execution is: the EGR valve of control 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 influences diesel engine (are designated as

) and suction pressure (be designated as P _Im), it has indicated the state of air system.Thus, in mode of execution of the present utility model, transfer function (being designated as W) can be designed to characterize the EGR flow rate of the aperture of EGR valve and pressure charging valve to diesel engine

And suction pressure (P _Im) influence.

According to some mode of execution of the present utility model, transfer function W is with the rotational speed omega and the fuel injection rate of motor These two important relatively engine operating conditions are as independent variable.At this moment, transfer function

Can be defined as follows:

$W(\mathrm{\ω},{\stackrel{\·}{m}}_f,s)=\left[\begin{array}{cc}{W}_{11}(\mathrm{\ω},{\stackrel{\·}{m}}_f,s)& W_{12}(\mathrm{\ω},{\stackrel{\·}{m}}_f,s)\\ W_{21}(\mathrm{\ω},{\stackrel{\·}{m}}_f,s)& W_{22}(\mathrm{\ω},{\stackrel{\·}{m}}_f,s)\end{array}\right]---\left(1\right)$

Wherein s is the working state of motor.Thus, as can be known according to the notion of transfer function:

$\left\{\begin{array}{c}{\stackrel{\·}{m}}_{\mathrm{EGR}}\\ P_{\mathrm{im}}\end{array}\right\}=\left[\begin{array}{cc}{W}_{11}(\mathrm{\ω},{\stackrel{\·}{m}}_f,s)& W_{12}(\mathrm{\ω},{\stackrel{\·}{m}}_f,s)\\ W_{21}(\mathrm{\ω},{\stackrel{\·}{m}}_f,s)& W_{22}(\mathrm{\ω},{\stackrel{\·}{m}}_f,s)\end{array}\right]\left\{\begin{array}{c}{\mathrm{EGR}}_{\mathrm{POS}}\\ {\mathrm{VGT}}_{\mathrm{POS}}\end{array}\right\}---\left(2\right)$

Wherein

Be the EGR flow rate of motor, P _ImBe the suction pressure of motor, EGR _POSBe the aperture of EGR valve, and VGT _POSIt is the aperture of pressure charging valve.

For the steady state condition of motor, s=0.At this moment, steady state transfer function

For:

$W(\mathrm{\ω},{\stackrel{\·}{m}}_f,0)=\left[\begin{array}{cc}{W}_{11}(\mathrm{\ω},{\stackrel{\·}{m}}_f,0)& W_{12}(\mathrm{\ω},{\stackrel{\·}{m}}_f,0)\\ W_{21}(\mathrm{\ω},{\stackrel{\·}{m}}_f,0)& W_{22}(\mathrm{\ω},{\stackrel{\·}{m}}_f,0)\end{array}\right]---\left(3\right)$

According to formula (2) and (3), under stable state, the relation between the EGR flow rate of diesel engine and suction pressure and EGR valve and the pressure charging valve can be expressed as:

$\left\{\begin{array}{c}{\stackrel{\·}{m}}_{\mathrm{EGR}}\\ P_{\mathrm{im}}\end{array}\right\}=\left[\begin{array}{cc}{W}_{11}(\mathrm{\ω},{\stackrel{\·}{m}}_f,0)& W_{12}(\mathrm{\ω},{\stackrel{\·}{m}}_f,0)\\ W_{21}(\mathrm{\ω},{\stackrel{\·}{m}}_f,0)& W_{22}(\mathrm{\ω},{\stackrel{\·}{m}}_f,0)\end{array}\right]\left\{\begin{array}{c}{\mathrm{EGR}}_{\mathrm{POS}}\\ {\mathrm{VGT}}_{\mathrm{POS}}\end{array}\right\}---\left(4\right)$

Wherein

Can utilize the steady state condition data of motor to demarcate, this is as known in the art, is not described in detail in this.In addition, according to mode of execution of the present utility model, transfer function W can be pre-determined, and is stored in the control apparatus 200 addressable memory devices.

Consider the decoupling zero transfer function (being designated as G) that decoupling zero computing device 204 will calculate below.Be similar to transfer function W, decoupling zero transfer function G is equally with the rotational speed omega and the fuel injection rate of motor

Be independent variable, and can be defined as follows:

$G(\mathrm{\ω},{\stackrel{\·}{m}}_f,s)=\left[\begin{array}{cc}{G}_{11}(\mathrm{\ω},{\stackrel{\·}{m}}_f,s)& G_{12}(\mathrm{\ω},{\stackrel{\·}{m}}_f,s)\\ G_{21}(\mathrm{\ω},{\stackrel{\·}{m}}_f,s)& G_{22}(\mathrm{\ω},{\stackrel{\·}{m}}_f,s)\end{array}\right]---\left(5\right)$

Under the stable state of motor, the decoupling zero transfer function

Then be:

$G(\mathrm{\ω},{\stackrel{\·}{m}}_f,0)=\left[\begin{array}{cc}{G}_{11}(\mathrm{\ω},{\stackrel{\·}{m}}_f,0)& G_{12}(\mathrm{\ω},{\stackrel{\·}{m}}_f,0)\\ G_{21}(\mathrm{\ω},{\stackrel{\·}{m}}_f,0)& G_{22}(\mathrm{\ω},{\stackrel{\·}{m}}_f,0)\end{array}\right]---\left(6\right)$

In a preferred implementation of the present utility model, for actual conditions and the theory expectation that makes transmitter mates to greatest extent, be used for steady state transfer function W contrary of calculation engine if decoupling zero computing device 204 is configurable, as stable state decoupling zero transfer function G.That is:

$G(\mathrm{\ω},{\stackrel{\·}{m}}_f,0)=W{(\mathrm{\ω},{\stackrel{\·}{m}}_f,0)}^{-1}---\left(7\right)$

According to formula (3), (6) and (7), can get:

$G(\mathrm{\ω},{\stackrel{\·}{m}}_f,0)$

$=\left[\begin{array}{cc}{G}_{11}(\mathrm{\ω},{\stackrel{\·}{m}}_f,0)& G_{12}(\mathrm{\ω},{\stackrel{\·}{m}}_f,0)\\ G_{21}(\mathrm{\ω},{\stackrel{\·}{m}}_f,0)& G_{22}(\mathrm{\ω},{\stackrel{\·}{m}}_f,0)\end{array}\right]$

$=\frac{1}{W_{11}(\mathrm{\ω},{\stackrel{\·}{m}}_f,0)W_{22}(\mathrm{\ω},{\stackrel{\·}{m}}_f,0)-W_{12}(\mathrm{\ω},{\stackrel{\·}{m}}_f,0)W_{21}(\mathrm{\ω},{\stackrel{\·}{m}}_f,0)}\left[\begin{array}{cc}{W}_{22}(\mathrm{\ω},{\stackrel{\·}{m}}_f,0)& -W_{12}(\mathrm{\ω},{\stackrel{\·}{m}}_f,0)\\ -W_{21}(\mathrm{\ω}\·{\stackrel{\·}{m}}_f,0)& W_{11}(\mathrm{\ω},{\stackrel{\·}{m}}_f,0)\end{array}\right]---\left(8\right)$

Thus, the engine operating condition parameter of obtaining according to operating mode obtaining device 202

And according to the transfer function that characterizes diesel engine

Decoupling zero computing device 204 can calculate decoupling zero transfer function G.As will be detailed later, by decoupling zero transfer function G is acted on corresponding physical quantity, can produce drive signal independently of one another, thereby realize the decoupling zero control of these two effectively at egr system and turbo charge system.

Should be appreciated that above-described only is some illustrative embodiments of the present utility model.For example, the feature of motor is not limited to only be characterized by rotating speed and fuel injection rate.On the contrary, transfer function W and decoupling zero transfer function G can include any relevant operating mode of motor in consideration (that is, with it as independent variable).And for example, it is preferred embodiment a kind of decoupling zero transfer function G being calculated as the contrary of motor transfer function W.Those skilled in the art can calculate decoupling zero transfer function G in other different modes according to transfer function W and duty parameter in conjunction with actual conditions.The utility model is all unrestricted in these areas.

Continuation is with reference to figure 2, and according to mode of execution of the present utility model, 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 used to handle the parameter of state of the air system of indication diesel engine.

Especially, in some mode of execution of the present utility model, the status parameter of air system can comprise: the 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 the parameter that configuration is used to obtain the actual EGR flow rate of indication motor (is designated as ); And suction pressure obtaining device 2028, the parameter that configuration is used to obtain the actual suction pressure of indication motor (is designated as P _{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 is obtained, as shown in Figure 2.

In addition, as shown in Figure 2, the target EGR flow rate that air system parameter processing apparatus 206 is also configurable to be used to receive diesel engine (is designated as

) and the target suction pressure (be designated as P _{Im, des}).For example, in some mode of execution of the present utility model,

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

Given actual value

P _{Im, act}And desired value

And P _{Im, des}, the air system parameter processing apparatus 206 configurable execution generation drive signal necessary processing that are used for.For example, according to some mode of execution of the present utility model, 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 handles, the gained processing result will be by signal generation device 208 (described below) in order to produce control signal.Said apparatus that comprises in the 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. only are exemplary.In fact, air system parameter processing apparatus 206 can dispose and be used for carrying out known at present or any suitable processing of exploitation in the future to the status parameter of air system.

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 producing first drive signal and second drive signal that are respectively applied for egr system and turbo charge system 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.

With reference to figure 3, it shows the schematic representation of the exemplary operation mechanism of signal generation device 208.In the example of Fig. 3, with above describe similar, transfer function W and decoupling zero transfer function G still with the rotating speed of diesel engine and fuel injection rate as independent variable.And the status parameter of air system is meant EGR flow rate and suction pressure.

In Fig. 3, the part in dotted line 301 left sides can be represented the operation of air system parameter processing apparatus 206, also promptly: 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, the processing here for example can comprise: determine EGR flow rate error e _mWith the suction pressure error e _P, and respectively to e _mAnd e _PCarrying out PID handles.

In addition, according to mode of execution of the present utility model, the transfer function shown in Fig. 3

Can calculate by decoupling zero computing device 204, and offer signal generation device 208, as mentioned above.

As shown in Figure 3, according to illustrative embodiments of the present utility model, signal generation device 208 is configurable be used for

Act on e _mPID handle output, gained is the result be designated as

And the configuration be used for

Act on e _PPID handle output, gained is the result be designated as

Then, signal generation device 208 configurable be used for

With

Be used to produce first drive signal jointly, with the aperture of control EGR valve.

Similarly, signal generation device 208 configurable be used for

Act on e _mPID handle output, gained is the result be designated as

And the configuration be used for

Act on e _PPID handle output, gained is the result be designated as

Signal generation device 208 is configurable be used for

With

Be used to produce second drive signal jointly, with the aperture of control pressure charging valve.

Be appreciated that the exemplary operation mechanism that only shows signal generation device 208 among Fig. 3.In other embodiments, the signal generation device 208 configurable related parameters that have that are used in a different manner decoupling zero transfer function G being acted on EGR flow rate and suction pressure, thus produce drive signal in the decoupling zero mode.

Above structure and operation according to control apparatus 200 of the present utility model have been described in conjunction with some embodiments.Description by above is to be understood that, according to mode of execution of the present utility model, control apparatus 200 can produce the drive signal that is used 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 multiple mode to implement.For example, in some embodiments, equipment 200 can be implemented as intergrated circuit (IC) chip.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, promptly is embodied as computer program.Scope of the present utility model is unrestricted in this regard.

With reference to figure 4, it shows the structured flowchart of the SOC(system on a chip) (SoC) 400 that is suitable for being used for implementing control apparatus shown in Figure 2 200.As shown in Figure 4, SoC 400 comprises various assemblies, such as input output (I/O) logic 410 (for example in order to comprise electronic circuit) and microprocessor 412 (for example, any microcontroller or DSP digital signal processor).SoC 400 also comprises storage 414, and it can be the random access storage device (RAM) of any kind, low nonvolatile memory (for example, flash memory), ROM (read-only memory) (ROM) and/or other the suitable electronic data storage of postponing.SoC 400 can also comprise various firmwares and/or software, and such as operation system 416, it can be the computer executable instructions of being safeguarded and being carried out by microprocessor 412 by storage 414.SoC 400 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 400 can comprise that operating mode obtains piece 402, decoupling zero computing block 404, air system parameter processing block 406 and signal generation block 408, 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 of above describing with reference to figure 2 208.In addition, although not shown in Fig. 4, according to mode of execution of the present utility model, operating mode is obtained the sub-piece that piece 402 can comprise the device 2022-2028 that corresponds respectively among Fig. 2.These pieces 402-408 and sub-piece 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 mode of execution of the present utility model SoC 400 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, operation entire equipment.SoC 400 can also comprise integrated data bus (not shown), and each assembly of its coupling SoC is to be used for the data communication between the assembly.The equipment that comprises SoC 400 can also utilize a plurality of combinations of different assemblies to realize.

Below with reference to Fig. 5, it shows the flow chart according to the controlling method 500 of the air system that is used for diesel engine of the utility model mode of execution.After method 500 beginnings, in step 502, 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, in step 504,, calculate decoupling zero transfer function (for example, above-described decoupling zero transfer function G) according to parameter that obtains in the step 502 and the transfer function (for example, above-described transfer function W) that characterizes this diesel engine.

Then, in step 506, handle the parameter of the state of the air system of indicating diesel engine.According to some mode of execution of the present utility model, the status parameter of air system comprises the EGR flow rate and the suction pressure of diesel engine.In such mode of execution, as mentioned above, can determine the two error separately, and error be carried out PID handle for future use according to the actual value and the desired value of EGR flow rate and suction pressure.Certainly, other air system status parameters and processing also are possible, and the utility model is unrestricted in this regard.

At last, in step 508,, produce first drive signal that is used for egr system and second drive signal that is used for turbo charge system respectively according to from the decoupling zero transfer function of step 504 with from the processing result of step 506.Method 500 finishes immediately.

The step 502-508 that is appreciated that in the method 500 record corresponds respectively to above operation and/or the function of the device 202-208 in the control apparatus of describing with reference to figure 2 200.Thus, the feature of above describing with reference to each device of control apparatus 200 is equally applicable to each step of method 500.And each step of record can be carried out and/or executed in parallel according to different orders in the method 500.

In addition, should be appreciated that the method for describing with reference to figure 5 500 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 computer-readable code part when for example processor is carried out, it is used for the step of manner of execution 500.

Above spirit of the present utility model and principle have been explained in conjunction with some embodiments.According to mode of execution of the present utility model, provide a kind of equipment that can be under stable state the air system of diesel engine be control effectively.In control procedure,, calculate the decoupling zero transfer function according to the duty parameter of the transfer function and the diesel engine of motor.By this decoupling zero transfer function being acted on the processing result that related parameter is arranged, can produce the drive signal that is used for exhaust gas recirculation (EGR) system and turbo charge system independently of one another to the EGR flow rate and the suction pressure of motor.In this way, mode of execution of the present utility model has 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, significantly improved the functional characteristic of air control system for air these two tersenesses that system demarcates.

Should be noted that mode of execution of the present utility model 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 the 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 can use a computer executable instruction and/or be included in the processor control routine of above-mentioned equipment realizes, for example on such as the mounting medium of disk, CD or DVD-ROM, such as the programmable memory of ROM (read-only memory) (firmware) or data medium, provide such code such as optics or electronic signal carrier.Equipment of the present utility model 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 carrying 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 only is not enforceable.In fact, according to mode of execution of the present utility model, 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 be divided into by multiple arrangement to be specialized.

In addition, although described the operation of the utility model method in the accompanying drawings 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 the flow chart can change execution sequence.Additionally or alternatively, can omit some step, a plurality of steps be merged into a step, or a step is decomposed into a plurality of steps.

Though described the utility model, should be appreciated that the utility model is not limited to disclosed embodiment with reference to some embodiments.The utility model is intended to contain the 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 (8)

1. equipment that is used under stable state the air system of control diesel engine, described air system comprises gas recirculation system and turbo charge system, it is characterized in that, described equipment comprises:

The operating mode obtaining device, configuration is used to obtain 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, and configuration is used for according to calculating the decoupling zero transfer function from the described parameter of described operating mode obtaining device and the transfer function that characterizes described diesel engine;

The air system parameter processing apparatus, it is coupled to described operating mode obtaining device, and configuration is used to handle the parameter of the state of indicating described air system; And

Signal generation device, it is coupled to described decoupling zero computing device and described air system parameter processing apparatus, configuration is used for producing first drive signal that is used for described gas recirculation system and second drive signal that is used for described turbo charge system 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.

2. equipment as claimed in claim 1 is characterized in that, as independent variable, described operating mode obtaining device further comprises described transfer function with the rotating speed of described diesel engine and fuel injection rate:

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

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

3. equipment as claimed in claim 1 is characterized in that, described 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 the target recirculated exhaust gas flow rate;

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

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 the device that PID handles at the suction pressure error.

4. equipment as claimed in claim 3 is characterized in that, described operating mode obtaining device further comprises:

Recirculated exhaust gas flow rate obtaining device, configuration is used to obtain 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 to obtain the parameter of the actual suction pressure of indicating described diesel engine, and provides it to described air system parameter processing apparatus.

5. equipment as claimed in claim 1 is characterized in that, described decoupling zero computing device further comprises: configuration is used to calculate the contrary device as described decoupling zero transfer function of described transfer function.

6. equipment as claimed in claim 1 is characterized in that, described first drive signal is used to control the aperture of the exhaust gas recirculation valve of described gas recirculation system, and wherein said second drive signal is used to control the aperture of the pressure charging valve of turbo charge system.

7. equipment as claimed in claim 1 is characterized in that, described equipment utilization SOC(system on a chip) SoC or IC are realized.

8. diesel engine is characterized in that comprising:

Cylinder block;

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

Exhaust duct is coupled to the outlet end of described cylinder block, and configuration is used to discharge 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 the part waste gas from described exhaust duct is carried back described cylinder block by described admission line; And

Turbo charge system is coupled to described exhaust duct, and configuration is used to be 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 the described air system of control under stable state.

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