CN102182576B - Device and method for controlling air system of diesel engine - Google Patents
Device and method for controlling air system of diesel engine Download PDFInfo
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Abstract
The embodiment of the invention relates to a device and a method for controlling the air system of a diesel engine. Specifically, according to the embodiment of the invention, the characteristics of the diesel engine can be represented by a transfer function. In the control process, the decoupling transfer function can be calculated based on the transfer function and the steady state working condition parameter of the diesel engine. When the decoupling transfer function acts on the processed air system state parameter, driving signals used to an EGR (exhaust gas recirculation) system and a turbocharging system can be independently generated, thus the decoupling of the driving signals can be realized. The embodiment of the invention discloses a corresponding device, the diesel engine and the method.
Description
Technical field
Embodiments of the present invention relate generally to diesel engine, more specifically, relate to equipment and method for the air system of control diesel engine.
Background technique
Along with the development of motor theory and technology, EGR (EGR) system has become the important component part in the 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 total pollutant output quantity will be reduced in the toxic emission.
Except 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, 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 effectively supercharging.
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 to 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 by the control of EGR valve, and the two all receives the engine exhaust of discharging from exhaust duct the turbine inlet end of the entry end of EGR valve and turbosupercharger.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 of diesel engine air system control all the time, and the multivariable Control strategy of controlling simultaneously both also is 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 the control target, adds transient state Feed-forward Control Strategy driving VGT valve by PID (proportional-integral-differential) control and makes actual supercharge pressure reach desired value; Take air mass flow as the control target, the control strategy driving EGR valve that adds the transient state feedforward by PID control makes actual air flow reach desired value.
(2) take Induction air flow and boost pressure as the control 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: such 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) take Induction air flow and boost pressure as the control target, according to the controller design method of non-analytical model: such as the fuzzy logic control method, according to the controlling method of neuron network etc.
(4) take Induction air flow and boost pressure as the control 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 right than and suction tude in the exhaust mass mark as controlling target, adopt air system contraction decoupling control policy, the transfer function matrix that is air system is contraction in some cases, therefore, two control targets 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 stable state control effect, and it is little to be used for the experiment work amount of demarcation of parameter.The shortcoming of closed loop PID control is because the coupled characteristic of system itself so that the control effect of its dynamic process is undesirable, the phenomenon of smoldering occurs easily in the process of accelerating.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, lead the replacement boost pressure as the control strategy of 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 or reliability, so that the EGR flow mainly obtains 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 so that very huge according to the control system test of the method.Although above control strategy can both be obtained preferably effect in stable state control, 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 the 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.The requirement that all can't satisfy 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 because 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 right than and suction tude in the exhaust mass mark as the control strategy (5) of controlling 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 directly take the feedback control of this parameter as the control 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 control is disadvantageous to instantaneous conditions.
In sum, the control strategy for 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, 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 the 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, a kind of equipment 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 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, and 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; 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 the described air system of control under stable state.
According to another aspect of the invention, a kind of method 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, 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; 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 can be under stable state the air system of diesel engine be control effectively.In embodiments of the present invention, utilize transfer function to characterize the feature of diesel engine.In control procedure, according to the parameter of this transfer function and indication working condition of diesel engine, computation decoupling transfer function.As will be detailed later, the decoupling zero transfer function is one of core concept of the present invention, is used for guaranteeing producing independently of one another for the driving signal of EGR valve with for the driving 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, EGR flow rate and the suction pressure of motor), can realize these two decoupling zeros that drive signal, this will be explained below.
In this way, embodiments of the present invention have guaranteed the independently of each other control 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
By reading with reference to the accompanying drawings detailed description hereinafter, 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 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 embodiment of the present invention;
The decoupling zero transfer function of utilizing that Fig. 3 shows according to embodiment of the present invention produces the schematic representation that two classes drive signal independently of one another;
Fig. 4 shows the schematic diagram of the SOC(system on a chip) (SoC) 400 of the control apparatus 200 that is suitable for putting into practice 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 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 only is for those skilled in the art can being understood 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 employed term " 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), only be 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, 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 Alternate.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 at present various means known or that develop in the future, 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 the diesel engine 100 among 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 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 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.
Should be appreciated that operating mode obtaining device 202 (and comprising sub-device 2022-2028) can obtain by actual measurement the duty parameter of motor.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 invention 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 for obtaining other duty parameters of diesel engine.This is that those skilled in the art expect easily, and 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 according to the transfer function that characterizes engine features, computation decoupling transfer function.Below in conjunction with concrete example, describe 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, etc.Especially, as indicated above, one of main purpose of embodiment of the present invention 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 affects diesel engine (are designated as
) and suction pressure (be designated as P
Im), it has indicated 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.
According to some mode of execution of the present invention, transfer function W is with rotational speed omega and the fuel injection rate of motor
These two relatively important engine operating conditions are as independent variable.At this moment, transfer function
Can be defined as follows:
Wherein s is the working state of motor.Thus, according to the concept of transfer function as can be known:
Wherein
The EGR flow rate of motor, P
ImThe suction pressure of motor, EGR
POSThe 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:
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:
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 the embodiment of the present invention, transfer function W can be pre-determined, and is stored in the control apparatus 200 addressable memory devices.
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, 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:
Under the stable state of motor, the decoupling zero transfer function
Then be:
In a preferred embodiment of the present 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:
According to formula (3), (6) and (7), can get:
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 independently of one another the driving signal for egr system and turbo charge system, thereby effectively realize the decoupling zero control of these two.
Should be appreciated that above-described only is 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.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 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, actCan demarcate in advance, and can be pre-stored in for example control apparatus 200 addressable memory devices or database.
Given actual value
P
Im, actAnd desired value
And P
Im, act, air system parameter processing apparatus 206 is configurable for carrying out the processing that generates driving 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, actWith target suction pressure P
Im, desBetween 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 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 for the status parameter of air system being carried out the at present known or in the future any suitable processing of exploitation.
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 to be respectively applied to first of egr system and turbo charge system and to drive signal and second and drive signal.
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 refers to EGR flow rate and suction pressure.
In Fig. 3, the part in dotted line 301 left sides can represent the operation of air system parameter processing apparatus 206, also namely: to the actual EGR flow rate of diesel engine
Target EGR flow rate
Actual suction pressure P
Im, actWith target suction pressure P
Im, desCarry 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 processes.
In addition, according to the embodiment of the present invention, the transfer function shown in Fig. 3
Can be calculated by decoupling zero computing device 204, and offer signal generation device 208, as mentioned above.
As shown in Figure 3, according to an illustrative embodiment of the invention, signal generation device 208 is configurable for inciting somebody to action
Act on e
mPID process output, acquired results is designated as
And configuration is used for will
Act on e
PPID process output, acquired results is designated as
Then, signal generation device 208 is configurable for inciting somebody to action
With
Jointly drive signal for generation of first, with the aperture of control EGR valve.
Similarly, signal generation device 208 is configurable for inciting somebody to action
Act on e
mPID process output, acquired results is designated as
And configuration is used for will
Act on e
PPID process output, acquired results is designated as
Signal generation device 208 is configurable for inciting somebody to action
With
Jointly drive signal for generation of second, 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, 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 effectively decoupling zero gas recirculation system and turbo charge system 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.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 4, it shows the structured flowchart of the SOC(system on a chip) (SoC) 400 that is suitable 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 type, 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 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 402 can comprise the device 2022-2028 that corresponds respectively among Fig. 2.These pieces 402-408 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 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, the whole equipment of operation.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 embodiment of the present invention.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, according to the parameter that obtains in the step 502 and the transfer function (for example, above-described transfer function W) that characterizes this diesel engine, computation decoupling transfer function (for example, above-described decoupling zero transfer function G).
Then, in step 506, 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 determine the two error separately according to actual value and the desired value of EGR flow rate and suction pressure, and error be carried out PID process for future use.Certainly, other air system status parameters and processing also are possible, and the present invention is unrestricted in this regard.
At last, in step 508, according to from the decoupling zero transfer function of step 504 with from the processing result of step 506, 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 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 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 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 500 of describing with reference to figure 5 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 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.In this way, embodiments of the present invention have guaranteed the independently of each other control 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 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 above-mentioned equipment and method can and/or be included in the processor control routine with computer executable instructions realizes, for example such as the mounting medium of disk, CD or DVD-ROM, provide such code such as the programmable memory of ROM (read-only memory) (firmware) or such as the data medium of 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 only is not 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 the 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 (14)
1. equipment that is used for the air system of control 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, and 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;
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. 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 and 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.
3. 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 the target recirculated exhaust gas flow rate;
Configuration is used for carrying out the device that PID processes for 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 processes for the suction pressure error.
4. equipment as claimed in claim 3, 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.
5. 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.
6. 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 the pressure charging valve of control turbo charge system.
7. equipment as claimed in claim 1, wherein said equipment utilization SOC(system on a chip) SoC or IC are realized.
8. 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 the described air system of control under stable state.
9. method that is used for the air system of control diesel engine under stable state, wherein said air system comprises gas recirculation system and turbo charge system, 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;
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 for the first driving signal of described gas recirculation system with for second of described turbo charge system and drive signal.
10. 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 9, 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.
11. method as claimed in claim 9, 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 the 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.
12. method as claimed in claim 11, 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.
13. method as claimed in claim 9 is wherein calculated described decoupling zero transfer function and is comprised:
Calculate the contrary as described decoupling zero transfer function of described transfer function.
14. method as claimed in claim 9, 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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| CN 201110032763 CN102182576B (en) | 2011-01-27 | 2011-01-27 | Device and method for controlling air system of diesel engine |
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| CN 201110032763 CN102182576B (en) | 2011-01-27 | 2011-01-27 | Device and method for controlling air system of diesel engine |
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| CN102297032B (en) * | 2011-08-26 | 2013-11-06 | 潍柴动力股份有限公司 | Equipment and method for controlling air system of diesel engine |
| US9623866B2 (en) * | 2015-05-15 | 2017-04-18 | Ford Global Technologies, Llc | Methods and systems for selectively adapting engine air flow |
| JP6750708B1 (en) * | 2019-06-03 | 2020-09-02 | トヨタ自動車株式会社 | Exhaust gas recirculation system abnormality detection device |
| CN112648088B (en) * | 2020-12-08 | 2023-01-24 | 潍柴动力股份有限公司 | Air system control method and device of engine and air system |
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| US6247311B1 (en) * | 1999-02-23 | 2001-06-19 | Nissan Motor Co., Ltd. | Diesel engine controller |
| CN1366579A (en) * | 2000-05-18 | 2002-08-28 | 日产自动车株式会社 | Diesel engine control |
| CN1466653A (en) * | 2000-03-03 | 2004-01-07 | ����Τ�����ʹ�˾ | Intelligent electric actuator for control of a turbocharger with and integrated exhaust gas recirculation valve |
| CN201953488U (en) * | 2011-01-27 | 2011-08-31 | 潍柴动力股份有限公司 | Device for controlling air system of diesel engine, and diesel engine |
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| JP2002285824A (en) * | 2001-03-26 | 2002-10-03 | Isuzu Motors Ltd | Exhaust temperature rise control method for engine and regeneration control method for exhaust emission control system |
| JP2005214153A (en) * | 2004-02-02 | 2005-08-11 | Nissan Diesel Motor Co Ltd | Intake air amount control device for internal combustion engine and its method |
| JP2005214152A (en) * | 2004-02-02 | 2005-08-11 | Nissan Diesel Motor Co Ltd | Intake air amount control device for internal combustion engine and its method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6247311B1 (en) * | 1999-02-23 | 2001-06-19 | Nissan Motor Co., Ltd. | Diesel engine controller |
| CN1466653A (en) * | 2000-03-03 | 2004-01-07 | ����Τ�����ʹ�˾ | Intelligent electric actuator for control of a turbocharger with and integrated exhaust gas recirculation valve |
| CN1366579A (en) * | 2000-05-18 | 2002-08-28 | 日产自动车株式会社 | Diesel engine control |
| CN201953488U (en) * | 2011-01-27 | 2011-08-31 | 潍柴动力股份有限公司 | Device for controlling air system of diesel engine, and diesel engine |
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